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

Version: ~ [ linux-5.4-rc7 ] ~ [ linux-5.3.11 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.84 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.154 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.201 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.201 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.77 ] ~ [ 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-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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  1 /*
  2  *  Server-side XDR for NFSv4
  3  *
  4  *  Copyright (c) 2002 The Regents of the University of Michigan.
  5  *  All rights reserved.
  6  *
  7  *  Kendrick Smith <kmsmith@umich.edu>
  8  *  Andy Adamson   <andros@umich.edu>
  9  *
 10  *  Redistribution and use in source and binary forms, with or without
 11  *  modification, are permitted provided that the following conditions
 12  *  are met:
 13  *
 14  *  1. Redistributions of source code must retain the above copyright
 15  *     notice, this list of conditions and the following disclaimer.
 16  *  2. Redistributions in binary form must reproduce the above copyright
 17  *     notice, this list of conditions and the following disclaimer in the
 18  *     documentation and/or other materials provided with the distribution.
 19  *  3. Neither the name of the University nor the names of its
 20  *     contributors may be used to endorse or promote products derived
 21  *     from this software without specific prior written permission.
 22  *
 23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 34  */
 35 
 36 #include <linux/fs_struct.h>
 37 #include <linux/file.h>
 38 #include <linux/slab.h>
 39 #include <linux/namei.h>
 40 #include <linux/statfs.h>
 41 #include <linux/utsname.h>
 42 #include <linux/pagemap.h>
 43 #include <linux/sunrpc/svcauth_gss.h>
 44 
 45 #include "idmap.h"
 46 #include "acl.h"
 47 #include "xdr4.h"
 48 #include "vfs.h"
 49 #include "state.h"
 50 #include "cache.h"
 51 #include "netns.h"
 52 #include "pnfs.h"
 53 
 54 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
 55 #include <linux/security.h>
 56 #endif
 57 
 58 
 59 #define NFSDDBG_FACILITY                NFSDDBG_XDR
 60 
 61 u32 nfsd_suppattrs[3][3] = {
 62         {NFSD4_SUPPORTED_ATTRS_WORD0,
 63          NFSD4_SUPPORTED_ATTRS_WORD1,
 64          NFSD4_SUPPORTED_ATTRS_WORD2},
 65 
 66         {NFSD4_1_SUPPORTED_ATTRS_WORD0,
 67          NFSD4_1_SUPPORTED_ATTRS_WORD1,
 68          NFSD4_1_SUPPORTED_ATTRS_WORD2},
 69 
 70         {NFSD4_1_SUPPORTED_ATTRS_WORD0,
 71          NFSD4_1_SUPPORTED_ATTRS_WORD1,
 72          NFSD4_2_SUPPORTED_ATTRS_WORD2},
 73 };
 74 
 75 /*
 76  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
 77  * directory in order to indicate to the client that a filesystem boundary is present
 78  * We use a fixed fsid for a referral
 79  */
 80 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
 81 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
 82 
 83 static __be32
 84 check_filename(char *str, int len)
 85 {
 86         int i;
 87 
 88         if (len == 0)
 89                 return nfserr_inval;
 90         if (isdotent(str, len))
 91                 return nfserr_badname;
 92         for (i = 0; i < len; i++)
 93                 if (str[i] == '/')
 94                         return nfserr_badname;
 95         return 0;
 96 }
 97 
 98 #define DECODE_HEAD                             \
 99         __be32 *p;                              \
100         __be32 status
101 #define DECODE_TAIL                             \
102         status = 0;                             \
103 out:                                            \
104         return status;                          \
105 xdr_error:                                      \
106         dprintk("NFSD: xdr error (%s:%d)\n",    \
107                         __FILE__, __LINE__);    \
108         status = nfserr_bad_xdr;                \
109         goto out
110 
111 #define READMEM(x,nbytes) do {                  \
112         x = (char *)p;                          \
113         p += XDR_QUADLEN(nbytes);               \
114 } while (0)
115 #define SAVEMEM(x,nbytes) do {                  \
116         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
117                 savemem(argp, p, nbytes) :      \
118                 (char *)p)) {                   \
119                 dprintk("NFSD: xdr error (%s:%d)\n", \
120                                 __FILE__, __LINE__); \
121                 goto xdr_error;                 \
122                 }                               \
123         p += XDR_QUADLEN(nbytes);               \
124 } while (0)
125 #define COPYMEM(x,nbytes) do {                  \
126         memcpy((x), p, nbytes);                 \
127         p += XDR_QUADLEN(nbytes);               \
128 } while (0)
129 
130 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
131 #define READ_BUF(nbytes)  do {                  \
132         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
133                 p = argp->p;                    \
134                 argp->p += XDR_QUADLEN(nbytes); \
135         } else if (!(p = read_buf(argp, nbytes))) { \
136                 dprintk("NFSD: xdr error (%s:%d)\n", \
137                                 __FILE__, __LINE__); \
138                 goto xdr_error;                 \
139         }                                       \
140 } while (0)
141 
142 static void next_decode_page(struct nfsd4_compoundargs *argp)
143 {
144         argp->p = page_address(argp->pagelist[0]);
145         argp->pagelist++;
146         if (argp->pagelen < PAGE_SIZE) {
147                 argp->end = argp->p + (argp->pagelen>>2);
148                 argp->pagelen = 0;
149         } else {
150                 argp->end = argp->p + (PAGE_SIZE>>2);
151                 argp->pagelen -= PAGE_SIZE;
152         }
153 }
154 
155 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
156 {
157         /* We want more bytes than seem to be available.
158          * Maybe we need a new page, maybe we have just run out
159          */
160         unsigned int avail = (char *)argp->end - (char *)argp->p;
161         __be32 *p;
162         if (avail + argp->pagelen < nbytes)
163                 return NULL;
164         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
165                 return NULL;
166         /* ok, we can do it with the current plus the next page */
167         if (nbytes <= sizeof(argp->tmp))
168                 p = argp->tmp;
169         else {
170                 kfree(argp->tmpp);
171                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
172                 if (!p)
173                         return NULL;
174                 
175         }
176         /*
177          * The following memcpy is safe because read_buf is always
178          * called with nbytes > avail, and the two cases above both
179          * guarantee p points to at least nbytes bytes.
180          */
181         memcpy(p, argp->p, avail);
182         next_decode_page(argp);
183         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
184         argp->p += XDR_QUADLEN(nbytes - avail);
185         return p;
186 }
187 
188 static int zero_clientid(clientid_t *clid)
189 {
190         return (clid->cl_boot == 0) && (clid->cl_id == 0);
191 }
192 
193 /**
194  * svcxdr_tmpalloc - allocate memory to be freed after compound processing
195  * @argp: NFSv4 compound argument structure
196  * @p: pointer to be freed (with kfree())
197  *
198  * Marks @p to be freed when processing the compound operation
199  * described in @argp finishes.
200  */
201 static void *
202 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
203 {
204         struct svcxdr_tmpbuf *tb;
205 
206         tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
207         if (!tb)
208                 return NULL;
209         tb->next = argp->to_free;
210         argp->to_free = tb;
211         return tb->buf;
212 }
213 
214 /*
215  * For xdr strings that need to be passed to other kernel api's
216  * as null-terminated strings.
217  *
218  * Note null-terminating in place usually isn't safe since the
219  * buffer might end on a page boundary.
220  */
221 static char *
222 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
223 {
224         char *p = svcxdr_tmpalloc(argp, len + 1);
225 
226         if (!p)
227                 return NULL;
228         memcpy(p, buf, len);
229         p[len] = '\0';
230         return p;
231 }
232 
233 /**
234  * savemem - duplicate a chunk of memory for later processing
235  * @argp: NFSv4 compound argument structure to be freed with
236  * @p: pointer to be duplicated
237  * @nbytes: length to be duplicated
238  *
239  * Returns a pointer to a copy of @nbytes bytes of memory at @p
240  * that are preserved until processing of the NFSv4 compound
241  * operation described by @argp finishes.
242  */
243 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
244 {
245         void *ret;
246 
247         ret = svcxdr_tmpalloc(argp, nbytes);
248         if (!ret)
249                 return NULL;
250         memcpy(ret, p, nbytes);
251         return ret;
252 }
253 
254 /*
255  * We require the high 32 bits of 'seconds' to be 0, and
256  * we ignore all 32 bits of 'nseconds'.
257  */
258 static __be32
259 nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec *tv)
260 {
261         DECODE_HEAD;
262         u64 sec;
263 
264         READ_BUF(12);
265         p = xdr_decode_hyper(p, &sec);
266         tv->tv_sec = sec;
267         tv->tv_nsec = be32_to_cpup(p++);
268         if (tv->tv_nsec >= (u32)1000000000)
269                 return nfserr_inval;
270 
271         DECODE_TAIL;
272 }
273 
274 static __be32
275 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
276 {
277         u32 bmlen;
278         DECODE_HEAD;
279 
280         bmval[0] = 0;
281         bmval[1] = 0;
282         bmval[2] = 0;
283 
284         READ_BUF(4);
285         bmlen = be32_to_cpup(p++);
286         if (bmlen > 1000)
287                 goto xdr_error;
288 
289         READ_BUF(bmlen << 2);
290         if (bmlen > 0)
291                 bmval[0] = be32_to_cpup(p++);
292         if (bmlen > 1)
293                 bmval[1] = be32_to_cpup(p++);
294         if (bmlen > 2)
295                 bmval[2] = be32_to_cpup(p++);
296 
297         DECODE_TAIL;
298 }
299 
300 static __be32
301 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
302                    struct iattr *iattr, struct nfs4_acl **acl,
303                    struct xdr_netobj *label, int *umask)
304 {
305         int expected_len, len = 0;
306         u32 dummy32;
307         char *buf;
308 
309         DECODE_HEAD;
310         iattr->ia_valid = 0;
311         if ((status = nfsd4_decode_bitmap(argp, bmval)))
312                 return status;
313 
314         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
315             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
316             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2) {
317                 if (nfsd_attrs_supported(argp->minorversion, bmval))
318                         return nfserr_inval;
319                 return nfserr_attrnotsupp;
320         }
321 
322         READ_BUF(4);
323         expected_len = be32_to_cpup(p++);
324 
325         if (bmval[0] & FATTR4_WORD0_SIZE) {
326                 READ_BUF(8);
327                 len += 8;
328                 p = xdr_decode_hyper(p, &iattr->ia_size);
329                 iattr->ia_valid |= ATTR_SIZE;
330         }
331         if (bmval[0] & FATTR4_WORD0_ACL) {
332                 u32 nace;
333                 struct nfs4_ace *ace;
334 
335                 READ_BUF(4); len += 4;
336                 nace = be32_to_cpup(p++);
337 
338                 if (nace > NFS4_ACL_MAX)
339                         return nfserr_fbig;
340 
341                 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace));
342                 if (*acl == NULL)
343                         return nfserr_jukebox;
344 
345                 (*acl)->naces = nace;
346                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
347                         READ_BUF(16); len += 16;
348                         ace->type = be32_to_cpup(p++);
349                         ace->flag = be32_to_cpup(p++);
350                         ace->access_mask = be32_to_cpup(p++);
351                         dummy32 = be32_to_cpup(p++);
352                         READ_BUF(dummy32);
353                         len += XDR_QUADLEN(dummy32) << 2;
354                         READMEM(buf, dummy32);
355                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
356                         status = nfs_ok;
357                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
358                                 ;
359                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
360                                 status = nfsd_map_name_to_gid(argp->rqstp,
361                                                 buf, dummy32, &ace->who_gid);
362                         else
363                                 status = nfsd_map_name_to_uid(argp->rqstp,
364                                                 buf, dummy32, &ace->who_uid);
365                         if (status)
366                                 return status;
367                 }
368         } else
369                 *acl = NULL;
370         if (bmval[1] & FATTR4_WORD1_MODE) {
371                 READ_BUF(4);
372                 len += 4;
373                 iattr->ia_mode = be32_to_cpup(p++);
374                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
375                 iattr->ia_valid |= ATTR_MODE;
376         }
377         if (bmval[1] & FATTR4_WORD1_OWNER) {
378                 READ_BUF(4);
379                 len += 4;
380                 dummy32 = be32_to_cpup(p++);
381                 READ_BUF(dummy32);
382                 len += (XDR_QUADLEN(dummy32) << 2);
383                 READMEM(buf, dummy32);
384                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
385                         return status;
386                 iattr->ia_valid |= ATTR_UID;
387         }
388         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
389                 READ_BUF(4);
390                 len += 4;
391                 dummy32 = be32_to_cpup(p++);
392                 READ_BUF(dummy32);
393                 len += (XDR_QUADLEN(dummy32) << 2);
394                 READMEM(buf, dummy32);
395                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
396                         return status;
397                 iattr->ia_valid |= ATTR_GID;
398         }
399         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
400                 READ_BUF(4);
401                 len += 4;
402                 dummy32 = be32_to_cpup(p++);
403                 switch (dummy32) {
404                 case NFS4_SET_TO_CLIENT_TIME:
405                         len += 12;
406                         status = nfsd4_decode_time(argp, &iattr->ia_atime);
407                         if (status)
408                                 return status;
409                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
410                         break;
411                 case NFS4_SET_TO_SERVER_TIME:
412                         iattr->ia_valid |= ATTR_ATIME;
413                         break;
414                 default:
415                         goto xdr_error;
416                 }
417         }
418         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
419                 READ_BUF(4);
420                 len += 4;
421                 dummy32 = be32_to_cpup(p++);
422                 switch (dummy32) {
423                 case NFS4_SET_TO_CLIENT_TIME:
424                         len += 12;
425                         status = nfsd4_decode_time(argp, &iattr->ia_mtime);
426                         if (status)
427                                 return status;
428                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
429                         break;
430                 case NFS4_SET_TO_SERVER_TIME:
431                         iattr->ia_valid |= ATTR_MTIME;
432                         break;
433                 default:
434                         goto xdr_error;
435                 }
436         }
437 
438         label->len = 0;
439 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
440         if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
441                 READ_BUF(4);
442                 len += 4;
443                 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
444                 READ_BUF(4);
445                 len += 4;
446                 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
447                 READ_BUF(4);
448                 len += 4;
449                 dummy32 = be32_to_cpup(p++);
450                 READ_BUF(dummy32);
451                 if (dummy32 > NFS4_MAXLABELLEN)
452                         return nfserr_badlabel;
453                 len += (XDR_QUADLEN(dummy32) << 2);
454                 READMEM(buf, dummy32);
455                 label->len = dummy32;
456                 label->data = svcxdr_dupstr(argp, buf, dummy32);
457                 if (!label->data)
458                         return nfserr_jukebox;
459         }
460 #endif
461         if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
462                 if (!umask)
463                         goto xdr_error;
464                 READ_BUF(8);
465                 len += 8;
466                 dummy32 = be32_to_cpup(p++);
467                 iattr->ia_mode = dummy32 & (S_IFMT | S_IALLUGO);
468                 dummy32 = be32_to_cpup(p++);
469                 *umask = dummy32 & S_IRWXUGO;
470                 iattr->ia_valid |= ATTR_MODE;
471         }
472         if (len != expected_len)
473                 goto xdr_error;
474 
475         DECODE_TAIL;
476 }
477 
478 static __be32
479 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
480 {
481         DECODE_HEAD;
482 
483         READ_BUF(sizeof(stateid_t));
484         sid->si_generation = be32_to_cpup(p++);
485         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
486 
487         DECODE_TAIL;
488 }
489 
490 static __be32
491 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
492 {
493         DECODE_HEAD;
494 
495         READ_BUF(4);
496         access->ac_req_access = be32_to_cpup(p++);
497 
498         DECODE_TAIL;
499 }
500 
501 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
502 {
503         DECODE_HEAD;
504         u32 dummy, uid, gid;
505         char *machine_name;
506         int i;
507         int nr_secflavs;
508 
509         /* callback_sec_params4 */
510         READ_BUF(4);
511         nr_secflavs = be32_to_cpup(p++);
512         if (nr_secflavs)
513                 cbs->flavor = (u32)(-1);
514         else
515                 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
516                 cbs->flavor = 0;
517         for (i = 0; i < nr_secflavs; ++i) {
518                 READ_BUF(4);
519                 dummy = be32_to_cpup(p++);
520                 switch (dummy) {
521                 case RPC_AUTH_NULL:
522                         /* Nothing to read */
523                         if (cbs->flavor == (u32)(-1))
524                                 cbs->flavor = RPC_AUTH_NULL;
525                         break;
526                 case RPC_AUTH_UNIX:
527                         READ_BUF(8);
528                         /* stamp */
529                         dummy = be32_to_cpup(p++);
530 
531                         /* machine name */
532                         dummy = be32_to_cpup(p++);
533                         READ_BUF(dummy);
534                         SAVEMEM(machine_name, dummy);
535 
536                         /* uid, gid */
537                         READ_BUF(8);
538                         uid = be32_to_cpup(p++);
539                         gid = be32_to_cpup(p++);
540 
541                         /* more gids */
542                         READ_BUF(4);
543                         dummy = be32_to_cpup(p++);
544                         READ_BUF(dummy * 4);
545                         if (cbs->flavor == (u32)(-1)) {
546                                 kuid_t kuid = make_kuid(&init_user_ns, uid);
547                                 kgid_t kgid = make_kgid(&init_user_ns, gid);
548                                 if (uid_valid(kuid) && gid_valid(kgid)) {
549                                         cbs->uid = kuid;
550                                         cbs->gid = kgid;
551                                         cbs->flavor = RPC_AUTH_UNIX;
552                                 } else {
553                                         dprintk("RPC_AUTH_UNIX with invalid"
554                                                 "uid or gid ignoring!\n");
555                                 }
556                         }
557                         break;
558                 case RPC_AUTH_GSS:
559                         dprintk("RPC_AUTH_GSS callback secflavor "
560                                 "not supported!\n");
561                         READ_BUF(8);
562                         /* gcbp_service */
563                         dummy = be32_to_cpup(p++);
564                         /* gcbp_handle_from_server */
565                         dummy = be32_to_cpup(p++);
566                         READ_BUF(dummy);
567                         p += XDR_QUADLEN(dummy);
568                         /* gcbp_handle_from_client */
569                         READ_BUF(4);
570                         dummy = be32_to_cpup(p++);
571                         READ_BUF(dummy);
572                         break;
573                 default:
574                         dprintk("Illegal callback secflavor\n");
575                         return nfserr_inval;
576                 }
577         }
578         DECODE_TAIL;
579 }
580 
581 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
582 {
583         DECODE_HEAD;
584 
585         READ_BUF(4);
586         bc->bc_cb_program = be32_to_cpup(p++);
587         nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
588 
589         DECODE_TAIL;
590 }
591 
592 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
593 {
594         DECODE_HEAD;
595 
596         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
597         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
598         bcts->dir = be32_to_cpup(p++);
599         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
600          * could help us figure out we should be using it. */
601         DECODE_TAIL;
602 }
603 
604 static __be32
605 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
606 {
607         DECODE_HEAD;
608 
609         READ_BUF(4);
610         close->cl_seqid = be32_to_cpup(p++);
611         return nfsd4_decode_stateid(argp, &close->cl_stateid);
612 
613         DECODE_TAIL;
614 }
615 
616 
617 static __be32
618 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
619 {
620         DECODE_HEAD;
621 
622         READ_BUF(12);
623         p = xdr_decode_hyper(p, &commit->co_offset);
624         commit->co_count = be32_to_cpup(p++);
625 
626         DECODE_TAIL;
627 }
628 
629 static __be32
630 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
631 {
632         DECODE_HEAD;
633 
634         READ_BUF(4);
635         create->cr_type = be32_to_cpup(p++);
636         switch (create->cr_type) {
637         case NF4LNK:
638                 READ_BUF(4);
639                 create->cr_datalen = be32_to_cpup(p++);
640                 READ_BUF(create->cr_datalen);
641                 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
642                 if (!create->cr_data)
643                         return nfserr_jukebox;
644                 break;
645         case NF4BLK:
646         case NF4CHR:
647                 READ_BUF(8);
648                 create->cr_specdata1 = be32_to_cpup(p++);
649                 create->cr_specdata2 = be32_to_cpup(p++);
650                 break;
651         case NF4SOCK:
652         case NF4FIFO:
653         case NF4DIR:
654         default:
655                 break;
656         }
657 
658         READ_BUF(4);
659         create->cr_namelen = be32_to_cpup(p++);
660         READ_BUF(create->cr_namelen);
661         SAVEMEM(create->cr_name, create->cr_namelen);
662         if ((status = check_filename(create->cr_name, create->cr_namelen)))
663                 return status;
664 
665         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
666                                     &create->cr_acl, &create->cr_label,
667                                     &current->fs->umask);
668         if (status)
669                 goto out;
670 
671         DECODE_TAIL;
672 }
673 
674 static inline __be32
675 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
676 {
677         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
678 }
679 
680 static inline __be32
681 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
682 {
683         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
684 }
685 
686 static __be32
687 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
688 {
689         DECODE_HEAD;
690 
691         READ_BUF(4);
692         link->li_namelen = be32_to_cpup(p++);
693         READ_BUF(link->li_namelen);
694         SAVEMEM(link->li_name, link->li_namelen);
695         if ((status = check_filename(link->li_name, link->li_namelen)))
696                 return status;
697 
698         DECODE_TAIL;
699 }
700 
701 static __be32
702 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
703 {
704         DECODE_HEAD;
705 
706         /*
707         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
708         */
709         READ_BUF(28);
710         lock->lk_type = be32_to_cpup(p++);
711         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
712                 goto xdr_error;
713         lock->lk_reclaim = be32_to_cpup(p++);
714         p = xdr_decode_hyper(p, &lock->lk_offset);
715         p = xdr_decode_hyper(p, &lock->lk_length);
716         lock->lk_is_new = be32_to_cpup(p++);
717 
718         if (lock->lk_is_new) {
719                 READ_BUF(4);
720                 lock->lk_new_open_seqid = be32_to_cpup(p++);
721                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
722                 if (status)
723                         return status;
724                 READ_BUF(8 + sizeof(clientid_t));
725                 lock->lk_new_lock_seqid = be32_to_cpup(p++);
726                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
727                 lock->lk_new_owner.len = be32_to_cpup(p++);
728                 READ_BUF(lock->lk_new_owner.len);
729                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
730         } else {
731                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
732                 if (status)
733                         return status;
734                 READ_BUF(4);
735                 lock->lk_old_lock_seqid = be32_to_cpup(p++);
736         }
737 
738         DECODE_TAIL;
739 }
740 
741 static __be32
742 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
743 {
744         DECODE_HEAD;
745                         
746         READ_BUF(32);
747         lockt->lt_type = be32_to_cpup(p++);
748         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
749                 goto xdr_error;
750         p = xdr_decode_hyper(p, &lockt->lt_offset);
751         p = xdr_decode_hyper(p, &lockt->lt_length);
752         COPYMEM(&lockt->lt_clientid, 8);
753         lockt->lt_owner.len = be32_to_cpup(p++);
754         READ_BUF(lockt->lt_owner.len);
755         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
756 
757         DECODE_TAIL;
758 }
759 
760 static __be32
761 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
762 {
763         DECODE_HEAD;
764 
765         READ_BUF(8);
766         locku->lu_type = be32_to_cpup(p++);
767         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
768                 goto xdr_error;
769         locku->lu_seqid = be32_to_cpup(p++);
770         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
771         if (status)
772                 return status;
773         READ_BUF(16);
774         p = xdr_decode_hyper(p, &locku->lu_offset);
775         p = xdr_decode_hyper(p, &locku->lu_length);
776 
777         DECODE_TAIL;
778 }
779 
780 static __be32
781 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
782 {
783         DECODE_HEAD;
784 
785         READ_BUF(4);
786         lookup->lo_len = be32_to_cpup(p++);
787         READ_BUF(lookup->lo_len);
788         SAVEMEM(lookup->lo_name, lookup->lo_len);
789         if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
790                 return status;
791 
792         DECODE_TAIL;
793 }
794 
795 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
796 {
797         __be32 *p;
798         u32 w;
799 
800         READ_BUF(4);
801         w = be32_to_cpup(p++);
802         *share_access = w & NFS4_SHARE_ACCESS_MASK;
803         *deleg_want = w & NFS4_SHARE_WANT_MASK;
804         if (deleg_when)
805                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
806 
807         switch (w & NFS4_SHARE_ACCESS_MASK) {
808         case NFS4_SHARE_ACCESS_READ:
809         case NFS4_SHARE_ACCESS_WRITE:
810         case NFS4_SHARE_ACCESS_BOTH:
811                 break;
812         default:
813                 return nfserr_bad_xdr;
814         }
815         w &= ~NFS4_SHARE_ACCESS_MASK;
816         if (!w)
817                 return nfs_ok;
818         if (!argp->minorversion)
819                 return nfserr_bad_xdr;
820         switch (w & NFS4_SHARE_WANT_MASK) {
821         case NFS4_SHARE_WANT_NO_PREFERENCE:
822         case NFS4_SHARE_WANT_READ_DELEG:
823         case NFS4_SHARE_WANT_WRITE_DELEG:
824         case NFS4_SHARE_WANT_ANY_DELEG:
825         case NFS4_SHARE_WANT_NO_DELEG:
826         case NFS4_SHARE_WANT_CANCEL:
827                 break;
828         default:
829                 return nfserr_bad_xdr;
830         }
831         w &= ~NFS4_SHARE_WANT_MASK;
832         if (!w)
833                 return nfs_ok;
834 
835         if (!deleg_when)        /* open_downgrade */
836                 return nfserr_inval;
837         switch (w) {
838         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
839         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
840         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
841               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
842                 return nfs_ok;
843         }
844 xdr_error:
845         return nfserr_bad_xdr;
846 }
847 
848 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
849 {
850         __be32 *p;
851 
852         READ_BUF(4);
853         *x = be32_to_cpup(p++);
854         /* Note: unlinke access bits, deny bits may be zero. */
855         if (*x & ~NFS4_SHARE_DENY_BOTH)
856                 return nfserr_bad_xdr;
857         return nfs_ok;
858 xdr_error:
859         return nfserr_bad_xdr;
860 }
861 
862 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
863 {
864         __be32 *p;
865 
866         READ_BUF(4);
867         o->len = be32_to_cpup(p++);
868 
869         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
870                 return nfserr_bad_xdr;
871 
872         READ_BUF(o->len);
873         SAVEMEM(o->data, o->len);
874         return nfs_ok;
875 xdr_error:
876         return nfserr_bad_xdr;
877 }
878 
879 static __be32
880 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
881 {
882         DECODE_HEAD;
883         u32 dummy;
884 
885         memset(open->op_bmval, 0, sizeof(open->op_bmval));
886         open->op_iattr.ia_valid = 0;
887         open->op_openowner = NULL;
888 
889         open->op_xdr_error = 0;
890         /* seqid, share_access, share_deny, clientid, ownerlen */
891         READ_BUF(4);
892         open->op_seqid = be32_to_cpup(p++);
893         /* decode, yet ignore deleg_when until supported */
894         status = nfsd4_decode_share_access(argp, &open->op_share_access,
895                                            &open->op_deleg_want, &dummy);
896         if (status)
897                 goto xdr_error;
898         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
899         if (status)
900                 goto xdr_error;
901         READ_BUF(sizeof(clientid_t));
902         COPYMEM(&open->op_clientid, sizeof(clientid_t));
903         status = nfsd4_decode_opaque(argp, &open->op_owner);
904         if (status)
905                 goto xdr_error;
906         READ_BUF(4);
907         open->op_create = be32_to_cpup(p++);
908         switch (open->op_create) {
909         case NFS4_OPEN_NOCREATE:
910                 break;
911         case NFS4_OPEN_CREATE:
912                 current->fs->umask = 0;
913                 READ_BUF(4);
914                 open->op_createmode = be32_to_cpup(p++);
915                 switch (open->op_createmode) {
916                 case NFS4_CREATE_UNCHECKED:
917                 case NFS4_CREATE_GUARDED:
918                         status = nfsd4_decode_fattr(argp, open->op_bmval,
919                                 &open->op_iattr, &open->op_acl, &open->op_label,
920                                 &current->fs->umask);
921                         if (status)
922                                 goto out;
923                         break;
924                 case NFS4_CREATE_EXCLUSIVE:
925                         READ_BUF(NFS4_VERIFIER_SIZE);
926                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
927                         break;
928                 case NFS4_CREATE_EXCLUSIVE4_1:
929                         if (argp->minorversion < 1)
930                                 goto xdr_error;
931                         READ_BUF(NFS4_VERIFIER_SIZE);
932                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
933                         status = nfsd4_decode_fattr(argp, open->op_bmval,
934                                 &open->op_iattr, &open->op_acl, &open->op_label,
935                                 &current->fs->umask);
936                         if (status)
937                                 goto out;
938                         break;
939                 default:
940                         goto xdr_error;
941                 }
942                 break;
943         default:
944                 goto xdr_error;
945         }
946 
947         /* open_claim */
948         READ_BUF(4);
949         open->op_claim_type = be32_to_cpup(p++);
950         switch (open->op_claim_type) {
951         case NFS4_OPEN_CLAIM_NULL:
952         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
953                 READ_BUF(4);
954                 open->op_fname.len = be32_to_cpup(p++);
955                 READ_BUF(open->op_fname.len);
956                 SAVEMEM(open->op_fname.data, open->op_fname.len);
957                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
958                         return status;
959                 break;
960         case NFS4_OPEN_CLAIM_PREVIOUS:
961                 READ_BUF(4);
962                 open->op_delegate_type = be32_to_cpup(p++);
963                 break;
964         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
965                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
966                 if (status)
967                         return status;
968                 READ_BUF(4);
969                 open->op_fname.len = be32_to_cpup(p++);
970                 READ_BUF(open->op_fname.len);
971                 SAVEMEM(open->op_fname.data, open->op_fname.len);
972                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
973                         return status;
974                 break;
975         case NFS4_OPEN_CLAIM_FH:
976         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
977                 if (argp->minorversion < 1)
978                         goto xdr_error;
979                 /* void */
980                 break;
981         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
982                 if (argp->minorversion < 1)
983                         goto xdr_error;
984                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
985                 if (status)
986                         return status;
987                 break;
988         default:
989                 goto xdr_error;
990         }
991 
992         DECODE_TAIL;
993 }
994 
995 static __be32
996 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
997 {
998         DECODE_HEAD;
999 
1000         if (argp->minorversion >= 1)
1001                 return nfserr_notsupp;
1002 
1003         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
1004         if (status)
1005                 return status;
1006         READ_BUF(4);
1007         open_conf->oc_seqid = be32_to_cpup(p++);
1008 
1009         DECODE_TAIL;
1010 }
1011 
1012 static __be32
1013 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
1014 {
1015         DECODE_HEAD;
1016                     
1017         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
1018         if (status)
1019                 return status;
1020         READ_BUF(4);
1021         open_down->od_seqid = be32_to_cpup(p++);
1022         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
1023                                            &open_down->od_deleg_want, NULL);
1024         if (status)
1025                 return status;
1026         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
1027         if (status)
1028                 return status;
1029         DECODE_TAIL;
1030 }
1031 
1032 static __be32
1033 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
1034 {
1035         DECODE_HEAD;
1036 
1037         READ_BUF(4);
1038         putfh->pf_fhlen = be32_to_cpup(p++);
1039         if (putfh->pf_fhlen > NFS4_FHSIZE)
1040                 goto xdr_error;
1041         READ_BUF(putfh->pf_fhlen);
1042         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1043 
1044         DECODE_TAIL;
1045 }
1046 
1047 static __be32
1048 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1049 {
1050         if (argp->minorversion == 0)
1051                 return nfs_ok;
1052         return nfserr_notsupp;
1053 }
1054 
1055 static __be32
1056 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1057 {
1058         DECODE_HEAD;
1059 
1060         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1061         if (status)
1062                 return status;
1063         READ_BUF(12);
1064         p = xdr_decode_hyper(p, &read->rd_offset);
1065         read->rd_length = be32_to_cpup(p++);
1066 
1067         DECODE_TAIL;
1068 }
1069 
1070 static __be32
1071 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1072 {
1073         DECODE_HEAD;
1074 
1075         READ_BUF(24);
1076         p = xdr_decode_hyper(p, &readdir->rd_cookie);
1077         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1078         readdir->rd_dircount = be32_to_cpup(p++);
1079         readdir->rd_maxcount = be32_to_cpup(p++);
1080         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1081                 goto out;
1082 
1083         DECODE_TAIL;
1084 }
1085 
1086 static __be32
1087 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1088 {
1089         DECODE_HEAD;
1090 
1091         READ_BUF(4);
1092         remove->rm_namelen = be32_to_cpup(p++);
1093         READ_BUF(remove->rm_namelen);
1094         SAVEMEM(remove->rm_name, remove->rm_namelen);
1095         if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1096                 return status;
1097 
1098         DECODE_TAIL;
1099 }
1100 
1101 static __be32
1102 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1103 {
1104         DECODE_HEAD;
1105 
1106         READ_BUF(4);
1107         rename->rn_snamelen = be32_to_cpup(p++);
1108         READ_BUF(rename->rn_snamelen);
1109         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1110         READ_BUF(4);
1111         rename->rn_tnamelen = be32_to_cpup(p++);
1112         READ_BUF(rename->rn_tnamelen);
1113         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1114         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1115                 return status;
1116         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1117                 return status;
1118 
1119         DECODE_TAIL;
1120 }
1121 
1122 static __be32
1123 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1124 {
1125         DECODE_HEAD;
1126 
1127         if (argp->minorversion >= 1)
1128                 return nfserr_notsupp;
1129 
1130         READ_BUF(sizeof(clientid_t));
1131         COPYMEM(clientid, sizeof(clientid_t));
1132 
1133         DECODE_TAIL;
1134 }
1135 
1136 static __be32
1137 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1138                      struct nfsd4_secinfo *secinfo)
1139 {
1140         DECODE_HEAD;
1141 
1142         READ_BUF(4);
1143         secinfo->si_namelen = be32_to_cpup(p++);
1144         READ_BUF(secinfo->si_namelen);
1145         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1146         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1147         if (status)
1148                 return status;
1149         DECODE_TAIL;
1150 }
1151 
1152 static __be32
1153 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1154                      struct nfsd4_secinfo_no_name *sin)
1155 {
1156         DECODE_HEAD;
1157 
1158         READ_BUF(4);
1159         sin->sin_style = be32_to_cpup(p++);
1160         DECODE_TAIL;
1161 }
1162 
1163 static __be32
1164 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1165 {
1166         __be32 status;
1167 
1168         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1169         if (status)
1170                 return status;
1171         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1172                                   &setattr->sa_acl, &setattr->sa_label, NULL);
1173 }
1174 
1175 static __be32
1176 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1177 {
1178         DECODE_HEAD;
1179 
1180         if (argp->minorversion >= 1)
1181                 return nfserr_notsupp;
1182 
1183         READ_BUF(NFS4_VERIFIER_SIZE);
1184         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1185 
1186         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1187         if (status)
1188                 return nfserr_bad_xdr;
1189         READ_BUF(8);
1190         setclientid->se_callback_prog = be32_to_cpup(p++);
1191         setclientid->se_callback_netid_len = be32_to_cpup(p++);
1192         READ_BUF(setclientid->se_callback_netid_len);
1193         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1194         READ_BUF(4);
1195         setclientid->se_callback_addr_len = be32_to_cpup(p++);
1196 
1197         READ_BUF(setclientid->se_callback_addr_len);
1198         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1199         READ_BUF(4);
1200         setclientid->se_callback_ident = be32_to_cpup(p++);
1201 
1202         DECODE_TAIL;
1203 }
1204 
1205 static __be32
1206 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1207 {
1208         DECODE_HEAD;
1209 
1210         if (argp->minorversion >= 1)
1211                 return nfserr_notsupp;
1212 
1213         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1214         COPYMEM(&scd_c->sc_clientid, 8);
1215         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1216 
1217         DECODE_TAIL;
1218 }
1219 
1220 /* Also used for NVERIFY */
1221 static __be32
1222 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1223 {
1224         DECODE_HEAD;
1225 
1226         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1227                 goto out;
1228 
1229         /* For convenience's sake, we compare raw xdr'd attributes in
1230          * nfsd4_proc_verify */
1231 
1232         READ_BUF(4);
1233         verify->ve_attrlen = be32_to_cpup(p++);
1234         READ_BUF(verify->ve_attrlen);
1235         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1236 
1237         DECODE_TAIL;
1238 }
1239 
1240 static __be32
1241 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1242 {
1243         int avail;
1244         int len;
1245         DECODE_HEAD;
1246 
1247         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1248         if (status)
1249                 return status;
1250         READ_BUF(16);
1251         p = xdr_decode_hyper(p, &write->wr_offset);
1252         write->wr_stable_how = be32_to_cpup(p++);
1253         if (write->wr_stable_how > 2)
1254                 goto xdr_error;
1255         write->wr_buflen = be32_to_cpup(p++);
1256 
1257         /* Sorry .. no magic macros for this.. *
1258          * READ_BUF(write->wr_buflen);
1259          * SAVEMEM(write->wr_buf, write->wr_buflen);
1260          */
1261         avail = (char*)argp->end - (char*)argp->p;
1262         if (avail + argp->pagelen < write->wr_buflen) {
1263                 dprintk("NFSD: xdr error (%s:%d)\n",
1264                                 __FILE__, __LINE__);
1265                 goto xdr_error;
1266         }
1267         write->wr_head.iov_base = p;
1268         write->wr_head.iov_len = avail;
1269         write->wr_pagelist = argp->pagelist;
1270 
1271         len = XDR_QUADLEN(write->wr_buflen) << 2;
1272         if (len >= avail) {
1273                 int pages;
1274 
1275                 len -= avail;
1276 
1277                 pages = len >> PAGE_SHIFT;
1278                 argp->pagelist += pages;
1279                 argp->pagelen -= pages * PAGE_SIZE;
1280                 len -= pages * PAGE_SIZE;
1281 
1282                 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1283                 argp->pagelist++;
1284                 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1285         }
1286         argp->p += XDR_QUADLEN(len);
1287 
1288         DECODE_TAIL;
1289 }
1290 
1291 static __be32
1292 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1293 {
1294         DECODE_HEAD;
1295 
1296         if (argp->minorversion >= 1)
1297                 return nfserr_notsupp;
1298 
1299         READ_BUF(12);
1300         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1301         rlockowner->rl_owner.len = be32_to_cpup(p++);
1302         READ_BUF(rlockowner->rl_owner.len);
1303         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1304 
1305         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1306                 return nfserr_inval;
1307         DECODE_TAIL;
1308 }
1309 
1310 static __be32
1311 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1312                          struct nfsd4_exchange_id *exid)
1313 {
1314         int dummy, tmp;
1315         DECODE_HEAD;
1316 
1317         READ_BUF(NFS4_VERIFIER_SIZE);
1318         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1319 
1320         status = nfsd4_decode_opaque(argp, &exid->clname);
1321         if (status)
1322                 return nfserr_bad_xdr;
1323 
1324         READ_BUF(4);
1325         exid->flags = be32_to_cpup(p++);
1326 
1327         /* Ignore state_protect4_a */
1328         READ_BUF(4);
1329         exid->spa_how = be32_to_cpup(p++);
1330         switch (exid->spa_how) {
1331         case SP4_NONE:
1332                 break;
1333         case SP4_MACH_CRED:
1334                 /* spo_must_enforce */
1335                 status = nfsd4_decode_bitmap(argp,
1336                                         exid->spo_must_enforce);
1337                 if (status)
1338                         goto out;
1339                 /* spo_must_allow */
1340                 status = nfsd4_decode_bitmap(argp, exid->spo_must_allow);
1341                 if (status)
1342                         goto out;
1343                 break;
1344         case SP4_SSV:
1345                 /* ssp_ops */
1346                 READ_BUF(4);
1347                 dummy = be32_to_cpup(p++);
1348                 READ_BUF(dummy * 4);
1349                 p += dummy;
1350 
1351                 READ_BUF(4);
1352                 dummy = be32_to_cpup(p++);
1353                 READ_BUF(dummy * 4);
1354                 p += dummy;
1355 
1356                 /* ssp_hash_algs<> */
1357                 READ_BUF(4);
1358                 tmp = be32_to_cpup(p++);
1359                 while (tmp--) {
1360                         READ_BUF(4);
1361                         dummy = be32_to_cpup(p++);
1362                         READ_BUF(dummy);
1363                         p += XDR_QUADLEN(dummy);
1364                 }
1365 
1366                 /* ssp_encr_algs<> */
1367                 READ_BUF(4);
1368                 tmp = be32_to_cpup(p++);
1369                 while (tmp--) {
1370                         READ_BUF(4);
1371                         dummy = be32_to_cpup(p++);
1372                         READ_BUF(dummy);
1373                         p += XDR_QUADLEN(dummy);
1374                 }
1375 
1376                 /* ssp_window and ssp_num_gss_handles */
1377                 READ_BUF(8);
1378                 dummy = be32_to_cpup(p++);
1379                 dummy = be32_to_cpup(p++);
1380                 break;
1381         default:
1382                 goto xdr_error;
1383         }
1384 
1385         /* Ignore Implementation ID */
1386         READ_BUF(4);    /* nfs_impl_id4 array length */
1387         dummy = be32_to_cpup(p++);
1388 
1389         if (dummy > 1)
1390                 goto xdr_error;
1391 
1392         if (dummy == 1) {
1393                 /* nii_domain */
1394                 READ_BUF(4);
1395                 dummy = be32_to_cpup(p++);
1396                 READ_BUF(dummy);
1397                 p += XDR_QUADLEN(dummy);
1398 
1399                 /* nii_name */
1400                 READ_BUF(4);
1401                 dummy = be32_to_cpup(p++);
1402                 READ_BUF(dummy);
1403                 p += XDR_QUADLEN(dummy);
1404 
1405                 /* nii_date */
1406                 READ_BUF(12);
1407                 p += 3;
1408         }
1409         DECODE_TAIL;
1410 }
1411 
1412 static __be32
1413 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1414                             struct nfsd4_create_session *sess)
1415 {
1416         DECODE_HEAD;
1417         u32 dummy;
1418 
1419         READ_BUF(16);
1420         COPYMEM(&sess->clientid, 8);
1421         sess->seqid = be32_to_cpup(p++);
1422         sess->flags = be32_to_cpup(p++);
1423 
1424         /* Fore channel attrs */
1425         READ_BUF(28);
1426         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1427         sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1428         sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1429         sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1430         sess->fore_channel.maxops = be32_to_cpup(p++);
1431         sess->fore_channel.maxreqs = be32_to_cpup(p++);
1432         sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1433         if (sess->fore_channel.nr_rdma_attrs == 1) {
1434                 READ_BUF(4);
1435                 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1436         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1437                 dprintk("Too many fore channel attr bitmaps!\n");
1438                 goto xdr_error;
1439         }
1440 
1441         /* Back channel attrs */
1442         READ_BUF(28);
1443         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1444         sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1445         sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1446         sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1447         sess->back_channel.maxops = be32_to_cpup(p++);
1448         sess->back_channel.maxreqs = be32_to_cpup(p++);
1449         sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1450         if (sess->back_channel.nr_rdma_attrs == 1) {
1451                 READ_BUF(4);
1452                 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1453         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1454                 dprintk("Too many back channel attr bitmaps!\n");
1455                 goto xdr_error;
1456         }
1457 
1458         READ_BUF(4);
1459         sess->callback_prog = be32_to_cpup(p++);
1460         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1461         DECODE_TAIL;
1462 }
1463 
1464 static __be32
1465 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1466                              struct nfsd4_destroy_session *destroy_session)
1467 {
1468         DECODE_HEAD;
1469         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1470         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1471 
1472         DECODE_TAIL;
1473 }
1474 
1475 static __be32
1476 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1477                           struct nfsd4_free_stateid *free_stateid)
1478 {
1479         DECODE_HEAD;
1480 
1481         READ_BUF(sizeof(stateid_t));
1482         free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1483         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1484 
1485         DECODE_TAIL;
1486 }
1487 
1488 static __be32
1489 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1490                       struct nfsd4_sequence *seq)
1491 {
1492         DECODE_HEAD;
1493 
1494         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1495         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1496         seq->seqid = be32_to_cpup(p++);
1497         seq->slotid = be32_to_cpup(p++);
1498         seq->maxslots = be32_to_cpup(p++);
1499         seq->cachethis = be32_to_cpup(p++);
1500 
1501         DECODE_TAIL;
1502 }
1503 
1504 static __be32
1505 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1506 {
1507         int i;
1508         __be32 *p, status;
1509         struct nfsd4_test_stateid_id *stateid;
1510 
1511         READ_BUF(4);
1512         test_stateid->ts_num_ids = ntohl(*p++);
1513 
1514         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1515 
1516         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1517                 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1518                 if (!stateid) {
1519                         status = nfserrno(-ENOMEM);
1520                         goto out;
1521                 }
1522 
1523                 INIT_LIST_HEAD(&stateid->ts_id_list);
1524                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1525 
1526                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1527                 if (status)
1528                         goto out;
1529         }
1530 
1531         status = 0;
1532 out:
1533         return status;
1534 xdr_error:
1535         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1536         status = nfserr_bad_xdr;
1537         goto out;
1538 }
1539 
1540 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1541 {
1542         DECODE_HEAD;
1543 
1544         READ_BUF(8);
1545         COPYMEM(&dc->clientid, 8);
1546 
1547         DECODE_TAIL;
1548 }
1549 
1550 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1551 {
1552         DECODE_HEAD;
1553 
1554         READ_BUF(4);
1555         rc->rca_one_fs = be32_to_cpup(p++);
1556 
1557         DECODE_TAIL;
1558 }
1559 
1560 #ifdef CONFIG_NFSD_PNFS
1561 static __be32
1562 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1563                 struct nfsd4_getdeviceinfo *gdev)
1564 {
1565         DECODE_HEAD;
1566         u32 num, i;
1567 
1568         READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1569         COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1570         gdev->gd_layout_type = be32_to_cpup(p++);
1571         gdev->gd_maxcount = be32_to_cpup(p++);
1572         num = be32_to_cpup(p++);
1573         if (num) {
1574                 READ_BUF(4 * num);
1575                 gdev->gd_notify_types = be32_to_cpup(p++);
1576                 for (i = 1; i < num; i++) {
1577                         if (be32_to_cpup(p++)) {
1578                                 status = nfserr_inval;
1579                                 goto out;
1580                         }
1581                 }
1582         }
1583         DECODE_TAIL;
1584 }
1585 
1586 static __be32
1587 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1588                 struct nfsd4_layoutget *lgp)
1589 {
1590         DECODE_HEAD;
1591 
1592         READ_BUF(36);
1593         lgp->lg_signal = be32_to_cpup(p++);
1594         lgp->lg_layout_type = be32_to_cpup(p++);
1595         lgp->lg_seg.iomode = be32_to_cpup(p++);
1596         p = xdr_decode_hyper(p, &lgp->lg_seg.offset);
1597         p = xdr_decode_hyper(p, &lgp->lg_seg.length);
1598         p = xdr_decode_hyper(p, &lgp->lg_minlength);
1599 
1600         status = nfsd4_decode_stateid(argp, &lgp->lg_sid);
1601         if (status)
1602                 return status;
1603 
1604         READ_BUF(4);
1605         lgp->lg_maxcount = be32_to_cpup(p++);
1606 
1607         DECODE_TAIL;
1608 }
1609 
1610 static __be32
1611 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1612                 struct nfsd4_layoutcommit *lcp)
1613 {
1614         DECODE_HEAD;
1615         u32 timechange;
1616 
1617         READ_BUF(20);
1618         p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
1619         p = xdr_decode_hyper(p, &lcp->lc_seg.length);
1620         lcp->lc_reclaim = be32_to_cpup(p++);
1621 
1622         status = nfsd4_decode_stateid(argp, &lcp->lc_sid);
1623         if (status)
1624                 return status;
1625 
1626         READ_BUF(4);
1627         lcp->lc_newoffset = be32_to_cpup(p++);
1628         if (lcp->lc_newoffset) {
1629                 READ_BUF(8);
1630                 p = xdr_decode_hyper(p, &lcp->lc_last_wr);
1631         } else
1632                 lcp->lc_last_wr = 0;
1633         READ_BUF(4);
1634         timechange = be32_to_cpup(p++);
1635         if (timechange) {
1636                 status = nfsd4_decode_time(argp, &lcp->lc_mtime);
1637                 if (status)
1638                         return status;
1639         } else {
1640                 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1641         }
1642         READ_BUF(8);
1643         lcp->lc_layout_type = be32_to_cpup(p++);
1644 
1645         /*
1646          * Save the layout update in XDR format and let the layout driver deal
1647          * with it later.
1648          */
1649         lcp->lc_up_len = be32_to_cpup(p++);
1650         if (lcp->lc_up_len > 0) {
1651                 READ_BUF(lcp->lc_up_len);
1652                 READMEM(lcp->lc_up_layout, lcp->lc_up_len);
1653         }
1654 
1655         DECODE_TAIL;
1656 }
1657 
1658 static __be32
1659 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1660                 struct nfsd4_layoutreturn *lrp)
1661 {
1662         DECODE_HEAD;
1663 
1664         READ_BUF(16);
1665         lrp->lr_reclaim = be32_to_cpup(p++);
1666         lrp->lr_layout_type = be32_to_cpup(p++);
1667         lrp->lr_seg.iomode = be32_to_cpup(p++);
1668         lrp->lr_return_type = be32_to_cpup(p++);
1669         if (lrp->lr_return_type == RETURN_FILE) {
1670                 READ_BUF(16);
1671                 p = xdr_decode_hyper(p, &lrp->lr_seg.offset);
1672                 p = xdr_decode_hyper(p, &lrp->lr_seg.length);
1673 
1674                 status = nfsd4_decode_stateid(argp, &lrp->lr_sid);
1675                 if (status)
1676                         return status;
1677 
1678                 READ_BUF(4);
1679                 lrp->lrf_body_len = be32_to_cpup(p++);
1680                 if (lrp->lrf_body_len > 0) {
1681                         READ_BUF(lrp->lrf_body_len);
1682                         READMEM(lrp->lrf_body, lrp->lrf_body_len);
1683                 }
1684         } else {
1685                 lrp->lr_seg.offset = 0;
1686                 lrp->lr_seg.length = NFS4_MAX_UINT64;
1687         }
1688 
1689         DECODE_TAIL;
1690 }
1691 #endif /* CONFIG_NFSD_PNFS */
1692 
1693 static __be32
1694 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1695                        struct nfsd4_fallocate *fallocate)
1696 {
1697         DECODE_HEAD;
1698 
1699         status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1700         if (status)
1701                 return status;
1702 
1703         READ_BUF(16);
1704         p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1705         xdr_decode_hyper(p, &fallocate->falloc_length);
1706 
1707         DECODE_TAIL;
1708 }
1709 
1710 static __be32
1711 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
1712 {
1713         DECODE_HEAD;
1714 
1715         status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid);
1716         if (status)
1717                 return status;
1718         status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid);
1719         if (status)
1720                 return status;
1721 
1722         READ_BUF(8 + 8 + 8);
1723         p = xdr_decode_hyper(p, &clone->cl_src_pos);
1724         p = xdr_decode_hyper(p, &clone->cl_dst_pos);
1725         p = xdr_decode_hyper(p, &clone->cl_count);
1726         DECODE_TAIL;
1727 }
1728 
1729 static __be32
1730 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy)
1731 {
1732         DECODE_HEAD;
1733         unsigned int tmp;
1734 
1735         status = nfsd4_decode_stateid(argp, &copy->cp_src_stateid);
1736         if (status)
1737                 return status;
1738         status = nfsd4_decode_stateid(argp, &copy->cp_dst_stateid);
1739         if (status)
1740                 return status;
1741 
1742         READ_BUF(8 + 8 + 8 + 4 + 4 + 4);
1743         p = xdr_decode_hyper(p, &copy->cp_src_pos);
1744         p = xdr_decode_hyper(p, &copy->cp_dst_pos);
1745         p = xdr_decode_hyper(p, &copy->cp_count);
1746         copy->cp_consecutive = be32_to_cpup(p++);
1747         copy->cp_synchronous = be32_to_cpup(p++);
1748         tmp = be32_to_cpup(p); /* Source server list not supported */
1749 
1750         DECODE_TAIL;
1751 }
1752 
1753 static __be32
1754 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1755 {
1756         DECODE_HEAD;
1757 
1758         status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1759         if (status)
1760                 return status;
1761 
1762         READ_BUF(8 + 4);
1763         p = xdr_decode_hyper(p, &seek->seek_offset);
1764         seek->seek_whence = be32_to_cpup(p);
1765 
1766         DECODE_TAIL;
1767 }
1768 
1769 static __be32
1770 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1771 {
1772         return nfs_ok;
1773 }
1774 
1775 static __be32
1776 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1777 {
1778         return nfserr_notsupp;
1779 }
1780 
1781 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1782 
1783 static nfsd4_dec nfsd4_dec_ops[] = {
1784         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1785         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1786         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1787         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1788         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1789         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1790         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1791         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1792         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1793         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1794         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1795         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1796         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1797         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1798         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1799         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1800         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1801         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1802         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1803         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1804         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1805         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1806         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1807         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1808         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1809         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1810         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1811         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1812         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1813         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1814         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1815         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1816         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1817         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1818         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1819         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1820         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1821 
1822         /* new operations for NFSv4.1 */
1823         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1824         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1825         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1826         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1827         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1828         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1829         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1830 #ifdef CONFIG_NFSD_PNFS
1831         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1832         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1833         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_layoutcommit,
1834         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_layoutget,
1835         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_layoutreturn,
1836 #else
1837         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1838         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1839         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1840         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1841         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1842 #endif
1843         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1844         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1845         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1846         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1847         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1848         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1849         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1850 
1851         /* new operations for NFSv4.2 */
1852         [OP_ALLOCATE]           = (nfsd4_dec)nfsd4_decode_fallocate,
1853         [OP_COPY]               = (nfsd4_dec)nfsd4_decode_copy,
1854         [OP_COPY_NOTIFY]        = (nfsd4_dec)nfsd4_decode_notsupp,
1855         [OP_DEALLOCATE]         = (nfsd4_dec)nfsd4_decode_fallocate,
1856         [OP_IO_ADVISE]          = (nfsd4_dec)nfsd4_decode_notsupp,
1857         [OP_LAYOUTERROR]        = (nfsd4_dec)nfsd4_decode_notsupp,
1858         [OP_LAYOUTSTATS]        = (nfsd4_dec)nfsd4_decode_notsupp,
1859         [OP_OFFLOAD_CANCEL]     = (nfsd4_dec)nfsd4_decode_notsupp,
1860         [OP_OFFLOAD_STATUS]     = (nfsd4_dec)nfsd4_decode_notsupp,
1861         [OP_READ_PLUS]          = (nfsd4_dec)nfsd4_decode_notsupp,
1862         [OP_SEEK]               = (nfsd4_dec)nfsd4_decode_seek,
1863         [OP_WRITE_SAME]         = (nfsd4_dec)nfsd4_decode_notsupp,
1864         [OP_CLONE]              = (nfsd4_dec)nfsd4_decode_clone,
1865 };
1866 
1867 static inline bool
1868 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1869 {
1870         if (op->opnum < FIRST_NFS4_OP)
1871                 return false;
1872         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1873                 return false;
1874         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1875                 return false;
1876         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1877                 return false;
1878         return true;
1879 }
1880 
1881 static __be32
1882 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1883 {
1884         DECODE_HEAD;
1885         struct nfsd4_op *op;
1886         bool cachethis = false;
1887         int auth_slack= argp->rqstp->rq_auth_slack;
1888         int max_reply = auth_slack + 8; /* opcnt, status */
1889         int readcount = 0;
1890         int readbytes = 0;
1891         int i;
1892 
1893         READ_BUF(4);
1894         argp->taglen = be32_to_cpup(p++);
1895         READ_BUF(argp->taglen);
1896         SAVEMEM(argp->tag, argp->taglen);
1897         READ_BUF(8);
1898         argp->minorversion = be32_to_cpup(p++);
1899         argp->opcnt = be32_to_cpup(p++);
1900         max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1901 
1902         if (argp->taglen > NFSD4_MAX_TAGLEN)
1903                 goto xdr_error;
1904         if (argp->opcnt > 100)
1905                 goto xdr_error;
1906 
1907         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1908                 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1909                 if (!argp->ops) {
1910                         argp->ops = argp->iops;
1911                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1912                         goto xdr_error;
1913                 }
1914         }
1915 
1916         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1917                 argp->opcnt = 0;
1918 
1919         for (i = 0; i < argp->opcnt; i++) {
1920                 op = &argp->ops[i];
1921                 op->replay = NULL;
1922 
1923                 READ_BUF(4);
1924                 op->opnum = be32_to_cpup(p++);
1925 
1926                 if (nfsd4_opnum_in_range(argp, op))
1927                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1928                 else {
1929                         op->opnum = OP_ILLEGAL;
1930                         op->status = nfserr_op_illegal;
1931                 }
1932                 /*
1933                  * We'll try to cache the result in the DRC if any one
1934                  * op in the compound wants to be cached:
1935                  */
1936                 cachethis |= nfsd4_cache_this_op(op);
1937 
1938                 if (op->opnum == OP_READ) {
1939                         readcount++;
1940                         readbytes += nfsd4_max_reply(argp->rqstp, op);
1941                 } else
1942                         max_reply += nfsd4_max_reply(argp->rqstp, op);
1943                 /*
1944                  * OP_LOCK may return a conflicting lock.  (Special case
1945                  * because it will just skip encoding this if it runs
1946                  * out of xdr buffer space, and it is the only operation
1947                  * that behaves this way.)
1948                  */
1949                 if (op->opnum == OP_LOCK)
1950                         max_reply += NFS4_OPAQUE_LIMIT;
1951 
1952                 if (op->status) {
1953                         argp->opcnt = i+1;
1954                         break;
1955                 }
1956         }
1957         /* Sessions make the DRC unnecessary: */
1958         if (argp->minorversion)
1959                 cachethis = false;
1960         svc_reserve(argp->rqstp, max_reply + readbytes);
1961         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1962 
1963         if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1964                 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1965 
1966         DECODE_TAIL;
1967 }
1968 
1969 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode)
1970 {
1971         if (IS_I_VERSION(inode)) {
1972                 p = xdr_encode_hyper(p, inode->i_version);
1973         } else {
1974                 *p++ = cpu_to_be32(stat->ctime.tv_sec);
1975                 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
1976         }
1977         return p;
1978 }
1979 
1980 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
1981 {
1982         *p++ = cpu_to_be32(c->atomic);
1983         if (c->change_supported) {
1984                 p = xdr_encode_hyper(p, c->before_change);
1985                 p = xdr_encode_hyper(p, c->after_change);
1986         } else {
1987                 *p++ = cpu_to_be32(c->before_ctime_sec);
1988                 *p++ = cpu_to_be32(c->before_ctime_nsec);
1989                 *p++ = cpu_to_be32(c->after_ctime_sec);
1990                 *p++ = cpu_to_be32(c->after_ctime_nsec);
1991         }
1992         return p;
1993 }
1994 
1995 /* Encode as an array of strings the string given with components
1996  * separated @sep, escaped with esc_enter and esc_exit.
1997  */
1998 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
1999                                           char *components, char esc_enter,
2000                                           char esc_exit)
2001 {
2002         __be32 *p;
2003         __be32 pathlen;
2004         int pathlen_offset;
2005         int strlen, count=0;
2006         char *str, *end, *next;
2007 
2008         dprintk("nfsd4_encode_components(%s)\n", components);
2009 
2010         pathlen_offset = xdr->buf->len;
2011         p = xdr_reserve_space(xdr, 4);
2012         if (!p)
2013                 return nfserr_resource;
2014         p++; /* We will fill this in with @count later */
2015 
2016         end = str = components;
2017         while (*end) {
2018                 bool found_esc = false;
2019 
2020                 /* try to parse as esc_start, ..., esc_end, sep */
2021                 if (*str == esc_enter) {
2022                         for (; *end && (*end != esc_exit); end++)
2023                                 /* find esc_exit or end of string */;
2024                         next = end + 1;
2025                         if (*end && (!*next || *next == sep)) {
2026                                 str++;
2027                                 found_esc = true;
2028                         }
2029                 }
2030 
2031                 if (!found_esc)
2032                         for (; *end && (*end != sep); end++)
2033                                 /* find sep or end of string */;
2034 
2035                 strlen = end - str;
2036                 if (strlen) {
2037                         p = xdr_reserve_space(xdr, strlen + 4);
2038                         if (!p)
2039                                 return nfserr_resource;
2040                         p = xdr_encode_opaque(p, str, strlen);
2041                         count++;
2042                 }
2043                 else
2044                         end++;
2045                 if (found_esc)
2046                         end = next;
2047 
2048                 str = end;
2049         }
2050         pathlen = htonl(count);
2051         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2052         return 0;
2053 }
2054 
2055 /* Encode as an array of strings the string given with components
2056  * separated @sep.
2057  */
2058 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2059                                       char *components)
2060 {
2061         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2062 }
2063 
2064 /*
2065  * encode a location element of a fs_locations structure
2066  */
2067 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2068                                         struct nfsd4_fs_location *location)
2069 {
2070         __be32 status;
2071 
2072         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2073                                                 '[', ']');
2074         if (status)
2075                 return status;
2076         status = nfsd4_encode_components(xdr, '/', location->path);
2077         if (status)
2078                 return status;
2079         return 0;
2080 }
2081 
2082 /*
2083  * Encode a path in RFC3530 'pathname4' format
2084  */
2085 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2086                                 const struct path *root,
2087                                 const struct path *path)
2088 {
2089         struct path cur = *path;
2090         __be32 *p;
2091         struct dentry **components = NULL;
2092         unsigned int ncomponents = 0;
2093         __be32 err = nfserr_jukebox;
2094 
2095         dprintk("nfsd4_encode_components(");
2096 
2097         path_get(&cur);
2098         /* First walk the path up to the nfsd root, and store the
2099          * dentries/path components in an array.
2100          */
2101         for (;;) {
2102                 if (path_equal(&cur, root))
2103                         break;
2104                 if (cur.dentry == cur.mnt->mnt_root) {
2105                         if (follow_up(&cur))
2106                                 continue;
2107                         goto out_free;
2108                 }
2109                 if ((ncomponents & 15) == 0) {
2110                         struct dentry **new;
2111                         new = krealloc(components,
2112                                         sizeof(*new) * (ncomponents + 16),
2113                                         GFP_KERNEL);
2114                         if (!new)
2115                                 goto out_free;
2116                         components = new;
2117                 }
2118                 components[ncomponents++] = cur.dentry;
2119                 cur.dentry = dget_parent(cur.dentry);
2120         }
2121         err = nfserr_resource;
2122         p = xdr_reserve_space(xdr, 4);
2123         if (!p)
2124                 goto out_free;
2125         *p++ = cpu_to_be32(ncomponents);
2126 
2127         while (ncomponents) {
2128                 struct dentry *dentry = components[ncomponents - 1];
2129                 unsigned int len;
2130 
2131                 spin_lock(&dentry->d_lock);
2132                 len = dentry->d_name.len;
2133                 p = xdr_reserve_space(xdr, len + 4);
2134                 if (!p) {
2135                         spin_unlock(&dentry->d_lock);
2136                         goto out_free;
2137                 }
2138                 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2139                 dprintk("/%pd", dentry);
2140                 spin_unlock(&dentry->d_lock);
2141                 dput(dentry);
2142                 ncomponents--;
2143         }
2144 
2145         err = 0;
2146 out_free:
2147         dprintk(")\n");
2148         while (ncomponents)
2149                 dput(components[--ncomponents]);
2150         kfree(components);
2151         path_put(&cur);
2152         return err;
2153 }
2154 
2155 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2156                         struct svc_rqst *rqstp, const struct path *path)
2157 {
2158         struct svc_export *exp_ps;
2159         __be32 res;
2160 
2161         exp_ps = rqst_find_fsidzero_export(rqstp);
2162         if (IS_ERR(exp_ps))
2163                 return nfserrno(PTR_ERR(exp_ps));
2164         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2165         exp_put(exp_ps);
2166         return res;
2167 }
2168 
2169 /*
2170  *  encode a fs_locations structure
2171  */
2172 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2173                         struct svc_rqst *rqstp, struct svc_export *exp)
2174 {
2175         __be32 status;
2176         int i;
2177         __be32 *p;
2178         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2179 
2180         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2181         if (status)
2182                 return status;
2183         p = xdr_reserve_space(xdr, 4);
2184         if (!p)
2185                 return nfserr_resource;
2186         *p++ = cpu_to_be32(fslocs->locations_count);
2187         for (i=0; i<fslocs->locations_count; i++) {
2188                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2189                 if (status)
2190                         return status;
2191         }
2192         return 0;
2193 }
2194 
2195 static u32 nfs4_file_type(umode_t mode)
2196 {
2197         switch (mode & S_IFMT) {
2198         case S_IFIFO:   return NF4FIFO;
2199         case S_IFCHR:   return NF4CHR;
2200         case S_IFDIR:   return NF4DIR;
2201         case S_IFBLK:   return NF4BLK;
2202         case S_IFLNK:   return NF4LNK;
2203         case S_IFREG:   return NF4REG;
2204         case S_IFSOCK:  return NF4SOCK;
2205         default:        return NF4BAD;
2206         };
2207 }
2208 
2209 static inline __be32
2210 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2211                      struct nfs4_ace *ace)
2212 {
2213         if (ace->whotype != NFS4_ACL_WHO_NAMED)
2214                 return nfs4_acl_write_who(xdr, ace->whotype);
2215         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2216                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2217         else
2218                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2219 }
2220 
2221 static inline __be32
2222 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
2223 {
2224         __be32          *p;
2225         unsigned long   i = hweight_long(layout_types);
2226 
2227         p = xdr_reserve_space(xdr, 4 + 4 * i);
2228         if (!p)
2229                 return nfserr_resource;
2230 
2231         *p++ = cpu_to_be32(i);
2232 
2233         for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
2234                 if (layout_types & (1 << i))
2235                         *p++ = cpu_to_be32(i);
2236 
2237         return 0;
2238 }
2239 
2240 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2241                               FATTR4_WORD0_RDATTR_ERROR)
2242 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2243 #define WORD2_ABSENT_FS_ATTRS 0
2244 
2245 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2246 static inline __be32
2247 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2248                             void *context, int len)
2249 {
2250         __be32 *p;
2251 
2252         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2253         if (!p)
2254                 return nfserr_resource;
2255 
2256         /*
2257          * For now we use a 0 here to indicate the null translation; in
2258          * the future we may place a call to translation code here.
2259          */
2260         *p++ = cpu_to_be32(0); /* lfs */
2261         *p++ = cpu_to_be32(0); /* pi */
2262         p = xdr_encode_opaque(p, context, len);
2263         return 0;
2264 }
2265 #else
2266 static inline __be32
2267 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2268                             void *context, int len)
2269 { return 0; }
2270 #endif
2271 
2272 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2273 {
2274         /* As per referral draft:  */
2275         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2276             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2277                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2278                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2279                         *rdattr_err = NFSERR_MOVED;
2280                 else
2281                         return nfserr_moved;
2282         }
2283         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2284         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2285         *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2286         return 0;
2287 }
2288 
2289 
2290 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2291 {
2292         struct path path = exp->ex_path;
2293         int err;
2294 
2295         path_get(&path);
2296         while (follow_up(&path)) {
2297                 if (path.dentry != path.mnt->mnt_root)
2298                         break;
2299         }
2300         err = vfs_getattr(&path, stat);
2301         path_put(&path);
2302         return err;
2303 }
2304 
2305 static __be32
2306 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2307 {
2308         __be32 *p;
2309 
2310         if (bmval2) {
2311                 p = xdr_reserve_space(xdr, 16);
2312                 if (!p)
2313                         goto out_resource;
2314                 *p++ = cpu_to_be32(3);
2315                 *p++ = cpu_to_be32(bmval0);
2316                 *p++ = cpu_to_be32(bmval1);
2317                 *p++ = cpu_to_be32(bmval2);
2318         } else if (bmval1) {
2319                 p = xdr_reserve_space(xdr, 12);
2320                 if (!p)
2321                         goto out_resource;
2322                 *p++ = cpu_to_be32(2);
2323                 *p++ = cpu_to_be32(bmval0);
2324                 *p++ = cpu_to_be32(bmval1);
2325         } else {
2326                 p = xdr_reserve_space(xdr, 8);
2327                 if (!p)
2328                         goto out_resource;
2329                 *p++ = cpu_to_be32(1);
2330                 *p++ = cpu_to_be32(bmval0);
2331         }
2332 
2333         return 0;
2334 out_resource:
2335         return nfserr_resource;
2336 }
2337 
2338 /*
2339  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2340  * ourselves.
2341  */
2342 static __be32
2343 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2344                 struct svc_export *exp,
2345                 struct dentry *dentry, u32 *bmval,
2346                 struct svc_rqst *rqstp, int ignore_crossmnt)
2347 {
2348         u32 bmval0 = bmval[0];
2349         u32 bmval1 = bmval[1];
2350         u32 bmval2 = bmval[2];
2351         struct kstat stat;
2352         struct svc_fh *tempfh = NULL;
2353         struct kstatfs statfs;
2354         __be32 *p;
2355         int starting_len = xdr->buf->len;
2356         int attrlen_offset;
2357         __be32 attrlen;
2358         u32 dummy;
2359         u64 dummy64;
2360         u32 rdattr_err = 0;
2361         __be32 status;
2362         int err;
2363         struct nfs4_acl *acl = NULL;
2364         void *context = NULL;
2365         int contextlen;
2366         bool contextsupport = false;
2367         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2368         u32 minorversion = resp->cstate.minorversion;
2369         struct path path = {
2370                 .mnt    = exp->ex_path.mnt,
2371                 .dentry = dentry,
2372         };
2373         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2374 
2375         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2376         BUG_ON(!nfsd_attrs_supported(minorversion, bmval));
2377 
2378         if (exp->ex_fslocs.migrated) {
2379                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2380                 if (status)
2381                         goto out;
2382         }
2383 
2384         err = vfs_getattr(&path, &stat);
2385         if (err)
2386                 goto out_nfserr;
2387         if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2388                         FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2389             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2390                        FATTR4_WORD1_SPACE_TOTAL))) {
2391                 err = vfs_statfs(&path, &statfs);
2392                 if (err)
2393                         goto out_nfserr;
2394         }
2395         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2396                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2397                 status = nfserr_jukebox;
2398                 if (!tempfh)
2399                         goto out;
2400                 fh_init(tempfh, NFS4_FHSIZE);
2401                 status = fh_compose(tempfh, exp, dentry, NULL);
2402                 if (status)
2403                         goto out;
2404                 fhp = tempfh;
2405         }
2406         if (bmval0 & FATTR4_WORD0_ACL) {
2407                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2408                 if (err == -EOPNOTSUPP)
2409                         bmval0 &= ~FATTR4_WORD0_ACL;
2410                 else if (err == -EINVAL) {
2411                         status = nfserr_attrnotsupp;
2412                         goto out;
2413                 } else if (err != 0)
2414                         goto out_nfserr;
2415         }
2416 
2417 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2418         if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2419              bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2420                 err = security_inode_getsecctx(d_inode(dentry),
2421                                                 &context, &contextlen);
2422                 contextsupport = (err == 0);
2423                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2424                         if (err == -EOPNOTSUPP)
2425                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2426                         else if (err)
2427                                 goto out_nfserr;
2428                 }
2429         }
2430 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2431 
2432         status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2433         if (status)
2434                 goto out;
2435 
2436         attrlen_offset = xdr->buf->len;
2437         p = xdr_reserve_space(xdr, 4);
2438         if (!p)
2439                 goto out_resource;
2440         p++;                /* to be backfilled later */
2441 
2442         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2443                 u32 supp[3];
2444 
2445                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2446 
2447                 if (!IS_POSIXACL(dentry->d_inode))
2448                         supp[0] &= ~FATTR4_WORD0_ACL;
2449                 if (!contextsupport)
2450                         supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2451                 if (!supp[2]) {
2452                         p = xdr_reserve_space(xdr, 12);
2453                         if (!p)
2454                                 goto out_resource;
2455                         *p++ = cpu_to_be32(2);
2456                         *p++ = cpu_to_be32(supp[0]);
2457                         *p++ = cpu_to_be32(supp[1]);
2458                 } else {
2459                         p = xdr_reserve_space(xdr, 16);
2460                         if (!p)
2461                                 goto out_resource;
2462                         *p++ = cpu_to_be32(3);
2463                         *p++ = cpu_to_be32(supp[0]);
2464                         *p++ = cpu_to_be32(supp[1]);
2465                         *p++ = cpu_to_be32(supp[2]);
2466                 }
2467         }
2468         if (bmval0 & FATTR4_WORD0_TYPE) {
2469                 p = xdr_reserve_space(xdr, 4);
2470                 if (!p)
2471                         goto out_resource;
2472                 dummy = nfs4_file_type(stat.mode);
2473                 if (dummy == NF4BAD) {
2474                         status = nfserr_serverfault;
2475                         goto out;
2476                 }
2477                 *p++ = cpu_to_be32(dummy);
2478         }
2479         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2480                 p = xdr_reserve_space(xdr, 4);
2481                 if (!p)
2482                         goto out_resource;
2483                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2484                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2485                 else
2486                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2487                                                 NFS4_FH_VOL_RENAME);
2488         }
2489         if (bmval0 & FATTR4_WORD0_CHANGE) {
2490                 p = xdr_reserve_space(xdr, 8);
2491                 if (!p)
2492                         goto out_resource;
2493                 p = encode_change(p, &stat, d_inode(dentry));
2494         }
2495         if (bmval0 & FATTR4_WORD0_SIZE) {
2496                 p = xdr_reserve_space(xdr, 8);
2497                 if (!p)
2498                         goto out_resource;
2499                 p = xdr_encode_hyper(p, stat.size);
2500         }
2501         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2502                 p = xdr_reserve_space(xdr, 4);
2503                 if (!p)
2504                         goto out_resource;
2505                 *p++ = cpu_to_be32(1);
2506         }
2507         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2508                 p = xdr_reserve_space(xdr, 4);
2509                 if (!p)
2510                         goto out_resource;
2511                 *p++ = cpu_to_be32(1);
2512         }
2513         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2514                 p = xdr_reserve_space(xdr, 4);
2515                 if (!p)
2516                         goto out_resource;
2517                 *p++ = cpu_to_be32(0);
2518         }
2519         if (bmval0 & FATTR4_WORD0_FSID) {
2520                 p = xdr_reserve_space(xdr, 16);
2521                 if (!p)
2522                         goto out_resource;
2523                 if (exp->ex_fslocs.migrated) {
2524                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2525                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2526                 } else switch(fsid_source(fhp)) {
2527                 case FSIDSOURCE_FSID:
2528                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2529                         p = xdr_encode_hyper(p, (u64)0);
2530                         break;
2531                 case FSIDSOURCE_DEV:
2532                         *p++ = cpu_to_be32(0);
2533                         *p++ = cpu_to_be32(MAJOR(stat.dev));
2534                         *p++ = cpu_to_be32(0);
2535                         *p++ = cpu_to_be32(MINOR(stat.dev));
2536                         break;
2537                 case FSIDSOURCE_UUID:
2538                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2539                                                                 EX_UUID_LEN);
2540                         break;
2541                 }
2542         }
2543         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2544                 p = xdr_reserve_space(xdr, 4);
2545                 if (!p)
2546                         goto out_resource;
2547                 *p++ = cpu_to_be32(0);
2548         }
2549         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2550                 p = xdr_reserve_space(xdr, 4);
2551                 if (!p)
2552                         goto out_resource;
2553                 *p++ = cpu_to_be32(nn->nfsd4_lease);
2554         }
2555         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2556                 p = xdr_reserve_space(xdr, 4);
2557                 if (!p)
2558                         goto out_resource;
2559                 *p++ = cpu_to_be32(rdattr_err);
2560         }
2561         if (bmval0 & FATTR4_WORD0_ACL) {
2562                 struct nfs4_ace *ace;
2563 
2564                 if (acl == NULL) {
2565                         p = xdr_reserve_space(xdr, 4);
2566                         if (!p)
2567                                 goto out_resource;
2568 
2569                         *p++ = cpu_to_be32(0);
2570                         goto out_acl;
2571                 }
2572                 p = xdr_reserve_space(xdr, 4);
2573                 if (!p)
2574                         goto out_resource;
2575                 *p++ = cpu_to_be32(acl->naces);
2576 
2577                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2578                         p = xdr_reserve_space(xdr, 4*3);
2579                         if (!p)
2580                                 goto out_resource;
2581                         *p++ = cpu_to_be32(ace->type);
2582                         *p++ = cpu_to_be32(ace->flag);
2583                         *p++ = cpu_to_be32(ace->access_mask &
2584                                                         NFS4_ACE_MASK_ALL);
2585                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
2586                         if (status)
2587                                 goto out;
2588                 }
2589         }
2590 out_acl:
2591         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2592                 p = xdr_reserve_space(xdr, 4);
2593                 if (!p)
2594                         goto out_resource;
2595                 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2596                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2597         }
2598         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2599                 p = xdr_reserve_space(xdr, 4);
2600                 if (!p)
2601                         goto out_resource;
2602                 *p++ = cpu_to_be32(1);
2603         }
2604         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2605                 p = xdr_reserve_space(xdr, 4);
2606                 if (!p)
2607                         goto out_resource;
2608                 *p++ = cpu_to_be32(0);
2609         }
2610         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2611                 p = xdr_reserve_space(xdr, 4);
2612                 if (!p)
2613                         goto out_resource;
2614                 *p++ = cpu_to_be32(1);
2615         }
2616         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2617                 p = xdr_reserve_space(xdr, 4);
2618                 if (!p)
2619                         goto out_resource;
2620                 *p++ = cpu_to_be32(1);
2621         }
2622         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2623                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2624                 if (!p)
2625                         goto out_resource;
2626                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2627                                         fhp->fh_handle.fh_size);
2628         }
2629         if (bmval0 & FATTR4_WORD0_FILEID) {
2630                 p = xdr_reserve_space(xdr, 8);
2631                 if (!p)
2632                         goto out_resource;
2633                 p = xdr_encode_hyper(p, stat.ino);
2634         }
2635         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2636                 p = xdr_reserve_space(xdr, 8);
2637                 if (!p)
2638                         goto out_resource;
2639                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2640         }
2641         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2642                 p = xdr_reserve_space(xdr, 8);
2643                 if (!p)
2644                         goto out_resource;
2645                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2646         }
2647         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2648                 p = xdr_reserve_space(xdr, 8);
2649                 if (!p)
2650                         goto out_resource;
2651                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2652         }
2653         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2654                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2655                 if (status)
2656                         goto out;
2657         }
2658         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2659                 p = xdr_reserve_space(xdr, 4);
2660                 if (!p)
2661                         goto out_resource;
2662                 *p++ = cpu_to_be32(1);
2663         }
2664         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2665                 p = xdr_reserve_space(xdr, 8);
2666                 if (!p)
2667                         goto out_resource;
2668                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2669         }
2670         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2671                 p = xdr_reserve_space(xdr, 4);
2672                 if (!p)
2673                         goto out_resource;
2674                 *p++ = cpu_to_be32(255);
2675         }
2676         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2677                 p = xdr_reserve_space(xdr, 4);
2678                 if (!p)
2679                         goto out_resource;
2680                 *p++ = cpu_to_be32(statfs.f_namelen);
2681         }
2682         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2683                 p = xdr_reserve_space(xdr, 8);
2684                 if (!p)
2685                         goto out_resource;
2686                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2687         }
2688         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2689                 p = xdr_reserve_space(xdr, 8);
2690                 if (!p)
2691                         goto out_resource;
2692                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2693         }
2694         if (bmval1 & FATTR4_WORD1_MODE) {
2695                 p = xdr_reserve_space(xdr, 4);
2696                 if (!p)
2697                         goto out_resource;
2698                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2699         }
2700         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2701                 p = xdr_reserve_space(xdr, 4);
2702                 if (!p)
2703                         goto out_resource;
2704                 *p++ = cpu_to_be32(1);
2705         }
2706         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2707                 p = xdr_reserve_space(xdr, 4);
2708                 if (!p)
2709                         goto out_resource;
2710                 *p++ = cpu_to_be32(stat.nlink);
2711         }
2712         if (bmval1 & FATTR4_WORD1_OWNER) {
2713                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2714                 if (status)
2715                         goto out;
2716         }
2717         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2718                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2719                 if (status)
2720                         goto out;
2721         }
2722         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2723                 p = xdr_reserve_space(xdr, 8);
2724                 if (!p)
2725                         goto out_resource;
2726                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2727                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2728         }
2729         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2730                 p = xdr_reserve_space(xdr, 8);
2731                 if (!p)
2732                         goto out_resource;
2733                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2734                 p = xdr_encode_hyper(p, dummy64);
2735         }
2736         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2737                 p = xdr_reserve_space(xdr, 8);
2738                 if (!p)
2739                         goto out_resource;
2740                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2741                 p = xdr_encode_hyper(p, dummy64);
2742         }
2743         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2744                 p = xdr_reserve_space(xdr, 8);
2745                 if (!p)
2746                         goto out_resource;
2747                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2748                 p = xdr_encode_hyper(p, dummy64);
2749         }
2750         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2751                 p = xdr_reserve_space(xdr, 8);
2752                 if (!p)
2753                         goto out_resource;
2754                 dummy64 = (u64)stat.blocks << 9;
2755                 p = xdr_encode_hyper(p, dummy64);
2756         }
2757         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2758                 p = xdr_reserve_space(xdr, 12);
2759                 if (!p)
2760                         goto out_resource;
2761                 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2762                 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2763         }
2764         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2765                 p = xdr_reserve_space(xdr, 12);
2766                 if (!p)
2767                         goto out_resource;
2768                 *p++ = cpu_to_be32(0);
2769                 *p++ = cpu_to_be32(1);
2770                 *p++ = cpu_to_be32(0);
2771         }
2772         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2773                 p = xdr_reserve_space(xdr, 12);
2774                 if (!p)
2775                         goto out_resource;
2776                 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2777                 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2778         }
2779         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2780                 p = xdr_reserve_space(xdr, 12);
2781                 if (!p)
2782                         goto out_resource;
2783                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2784                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2785         }
2786         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2787                 struct kstat parent_stat;
2788                 u64 ino = stat.ino;
2789 
2790                 p = xdr_reserve_space(xdr, 8);
2791                 if (!p)
2792                         goto out_resource;
2793                 /*
2794                  * Get parent's attributes if not ignoring crossmount
2795                  * and this is the root of a cross-mounted filesystem.
2796                  */
2797                 if (ignore_crossmnt == 0 &&
2798                     dentry == exp->ex_path.mnt->mnt_root) {
2799                         err = get_parent_attributes(exp, &parent_stat);
2800                         if (err)
2801                                 goto out_nfserr;
2802                         ino = parent_stat.ino;
2803                 }
2804                 p = xdr_encode_hyper(p, ino);
2805         }
2806 #ifdef CONFIG_NFSD_PNFS
2807         if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
2808                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2809                 if (status)
2810                         goto out;
2811         }
2812 
2813         if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
2814                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2815                 if (status)
2816                         goto out;
2817         }
2818 
2819         if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2820                 p = xdr_reserve_space(xdr, 4);
2821                 if (!p)
2822                         goto out_resource;
2823                 *p++ = cpu_to_be32(stat.blksize);
2824         }
2825 #endif /* CONFIG_NFSD_PNFS */
2826         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2827                 status = nfsd4_encode_bitmap(xdr, NFSD_SUPPATTR_EXCLCREAT_WORD0,
2828                                                   NFSD_SUPPATTR_EXCLCREAT_WORD1,
2829                                                   NFSD_SUPPATTR_EXCLCREAT_WORD2);
2830                 if (status)
2831                         goto out;
2832         }
2833 
2834         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2835                 status = nfsd4_encode_security_label(xdr, rqstp, context,
2836                                                                 contextlen);
2837                 if (status)
2838                         goto out;
2839         }
2840 
2841         attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2842         write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2843         status = nfs_ok;
2844 
2845 out:
2846 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2847         if (context)
2848                 security_release_secctx(context, contextlen);
2849 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2850         kfree(acl);
2851         if (tempfh) {
2852                 fh_put(tempfh);
2853                 kfree(tempfh);
2854         }
2855         if (status)
2856                 xdr_truncate_encode(xdr, starting_len);
2857         return status;
2858 out_nfserr:
2859         status = nfserrno(err);
2860         goto out;
2861 out_resource:
2862         status = nfserr_resource;
2863         goto out;
2864 }
2865 
2866 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2867                                 struct xdr_buf *buf, __be32 *p, int bytes)
2868 {
2869         xdr->scratch.iov_len = 0;
2870         memset(buf, 0, sizeof(struct xdr_buf));
2871         buf->head[0].iov_base = p;
2872         buf->head[0].iov_len = 0;
2873         buf->len = 0;
2874         xdr->buf = buf;
2875         xdr->iov = buf->head;
2876         xdr->p = p;
2877         xdr->end = (void *)p + bytes;
2878         buf->buflen = bytes;
2879 }
2880 
2881 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2882                         struct svc_fh *fhp, struct svc_export *exp,
2883                         struct dentry *dentry, u32 *bmval,
2884                         struct svc_rqst *rqstp, int ignore_crossmnt)
2885 {
2886         struct xdr_buf dummy;
2887         struct xdr_stream xdr;
2888         __be32 ret;
2889 
2890         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2891         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2892                                                         ignore_crossmnt);
2893         *p = xdr.p;
2894         return ret;
2895 }
2896 
2897 static inline int attributes_need_mount(u32 *bmval)
2898 {
2899         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2900                 return 1;
2901         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2902                 return 1;
2903         return 0;
2904 }
2905 
2906 static __be32
2907 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2908                         const char *name, int namlen)
2909 {
2910         struct svc_export *exp = cd->rd_fhp->fh_export;
2911         struct dentry *dentry;
2912         __be32 nfserr;
2913         int ignore_crossmnt = 0;
2914 
2915         dentry = lookup_one_len_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
2916         if (IS_ERR(dentry))
2917                 return nfserrno(PTR_ERR(dentry));
2918         if (d_really_is_negative(dentry)) {
2919                 /*
2920                  * we're not holding the i_mutex here, so there's
2921                  * a window where this directory entry could have gone
2922                  * away.
2923                  */
2924                 dput(dentry);
2925                 return nfserr_noent;
2926         }
2927 
2928         exp_get(exp);
2929         /*
2930          * In the case of a mountpoint, the client may be asking for
2931          * attributes that are only properties of the underlying filesystem
2932          * as opposed to the cross-mounted file system. In such a case,
2933          * we will not follow the cross mount and will fill the attribtutes
2934          * directly from the mountpoint dentry.
2935          */
2936         if (nfsd_mountpoint(dentry, exp)) {
2937                 int err;
2938 
2939                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2940                                 && !attributes_need_mount(cd->rd_bmval)) {
2941                         ignore_crossmnt = 1;
2942                         goto out_encode;
2943                 }
2944                 /*
2945                  * Why the heck aren't we just using nfsd_lookup??
2946                  * Different "."/".." handling?  Something else?
2947                  * At least, add a comment here to explain....
2948                  */
2949                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2950                 if (err) {
2951                         nfserr = nfserrno(err);
2952                         goto out_put;
2953                 }
2954                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2955                 if (nfserr)
2956                         goto out_put;
2957 
2958         }
2959 out_encode:
2960         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2961                                         cd->rd_rqstp, ignore_crossmnt);
2962 out_put:
2963         dput(dentry);
2964         exp_put(exp);
2965         return nfserr;
2966 }
2967 
2968 static __be32 *
2969 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
2970 {
2971         __be32 *p;
2972 
2973         p = xdr_reserve_space(xdr, 20);
2974         if (!p)
2975                 return NULL;
2976         *p++ = htonl(2);
2977         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2978         *p++ = htonl(0);                         /* bmval1 */
2979 
2980         *p++ = htonl(4);     /* attribute length */
2981         *p++ = nfserr;       /* no htonl */
2982         return p;
2983 }
2984 
2985 static int
2986 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2987                     loff_t offset, u64 ino, unsigned int d_type)
2988 {
2989         struct readdir_cd *ccd = ccdv;
2990         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2991         struct xdr_stream *xdr = cd->xdr;
2992         int start_offset = xdr->buf->len;
2993         int cookie_offset;
2994         u32 name_and_cookie;
2995         int entry_bytes;
2996         __be32 nfserr = nfserr_toosmall;
2997         __be64 wire_offset;
2998         __be32 *p;
2999 
3000         /* In nfsv4, "." and ".." never make it onto the wire.. */
3001         if (name && isdotent(name, namlen)) {
3002                 cd->common.err = nfs_ok;
3003                 return 0;
3004         }
3005 
3006         if (cd->cookie_offset) {
3007                 wire_offset = cpu_to_be64(offset);
3008                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
3009                                                         &wire_offset, 8);
3010         }
3011 
3012         p = xdr_reserve_space(xdr, 4);
3013         if (!p)
3014                 goto fail;
3015         *p++ = xdr_one;                             /* mark entry present */
3016         cookie_offset = xdr->buf->len;
3017         p = xdr_reserve_space(xdr, 3*4 + namlen);
3018         if (!p)
3019                 goto fail;
3020         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
3021         p = xdr_encode_array(p, name, namlen);      /* name length & name */
3022 
3023         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
3024         switch (nfserr) {
3025         case nfs_ok:
3026                 break;
3027         case nfserr_resource:
3028                 nfserr = nfserr_toosmall;
3029                 goto fail;
3030         case nfserr_noent:
3031                 xdr_truncate_encode(xdr, start_offset);
3032                 goto skip_entry;
3033         default:
3034                 /*
3035                  * If the client requested the RDATTR_ERROR attribute,
3036                  * we stuff the error code into this attribute
3037                  * and continue.  If this attribute was not requested,
3038                  * then in accordance with the spec, we fail the
3039                  * entire READDIR operation(!)
3040                  */
3041                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3042                         goto fail;
3043                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
3044                 if (p == NULL) {
3045                         nfserr = nfserr_toosmall;
3046                         goto fail;
3047                 }
3048         }
3049         nfserr = nfserr_toosmall;
3050         entry_bytes = xdr->buf->len - start_offset;
3051         if (entry_bytes > cd->rd_maxcount)
3052                 goto fail;
3053         cd->rd_maxcount -= entry_bytes;
3054         /*
3055          * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
3056          * let's always let through the first entry, at least:
3057          */
3058         if (!cd->rd_dircount)
3059                 goto fail;
3060         name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3061         if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3062                 goto fail;
3063         cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3064 
3065         cd->cookie_offset = cookie_offset;
3066 skip_entry:
3067         cd->common.err = nfs_ok;
3068         return 0;
3069 fail:
3070         xdr_truncate_encode(xdr, start_offset);
3071         cd->common.err = nfserr;
3072         return -EINVAL;
3073 }
3074 
3075 static __be32
3076 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3077 {
3078         __be32 *p;
3079 
3080         p = xdr_reserve_space(xdr, sizeof(stateid_t));
3081         if (!p)
3082                 return nfserr_resource;
3083         *p++ = cpu_to_be32(sid->si_generation);
3084         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3085                                         sizeof(stateid_opaque_t));
3086         return 0;
3087 }
3088 
3089 static __be32
3090 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3091 {
3092         struct xdr_stream *xdr = &resp->xdr;
3093         __be32 *p;
3094 
3095         if (!nfserr) {
3096                 p = xdr_reserve_space(xdr, 8);
3097                 if (!p)
3098                         return nfserr_resource;
3099                 *p++ = cpu_to_be32(access->ac_supported);
3100                 *p++ = cpu_to_be32(access->ac_resp_access);
3101         }
3102         return nfserr;
3103 }
3104 
3105 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3106 {
3107         struct xdr_stream *xdr = &resp->xdr;
3108         __be32 *p;
3109 
3110         if (!nfserr) {
3111                 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3112                 if (!p)
3113                         return nfserr_resource;
3114                 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3115                                                 NFS4_MAX_SESSIONID_LEN);
3116                 *p++ = cpu_to_be32(bcts->dir);
3117                 /* Upshifting from TCP to RDMA is not supported */
3118                 *p++ = cpu_to_be32(0);
3119         }
3120         return nfserr;
3121 }
3122 
3123 static __be32
3124 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3125 {
3126         struct xdr_stream *xdr = &resp->xdr;
3127 
3128         if (!nfserr)
3129                 nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
3130 
3131         return nfserr;
3132 }
3133 
3134 
3135 static __be32
3136 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3137 {
3138         struct xdr_stream *xdr = &resp->xdr;
3139         __be32 *p;
3140 
3141         if (!nfserr) {
3142                 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3143                 if (!p)
3144                         return nfserr_resource;
3145                 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3146                                                 NFS4_VERIFIER_SIZE);
3147         }
3148         return nfserr;
3149 }
3150 
3151 static __be32
3152 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3153 {
3154         struct xdr_stream *xdr = &resp->xdr;
3155         __be32 *p;
3156 
3157         if (!nfserr) {
3158                 p = xdr_reserve_space(xdr, 20);
3159                 if (!p)
3160                         return nfserr_resource;
3161                 encode_cinfo(p, &create->cr_cinfo);
3162                 nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3163                                 create->cr_bmval[1], create->cr_bmval[2]);
3164         }
3165         return nfserr;
3166 }
3167 
3168 static __be32
3169 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3170 {
3171         struct svc_fh *fhp = getattr->ga_fhp;
3172         struct xdr_stream *xdr = &resp->xdr;
3173 
3174         if (nfserr)
3175                 return nfserr;
3176 
3177         nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3178                                     getattr->ga_bmval,
3179                                     resp->rqstp, 0);
3180         return nfserr;
3181 }
3182 
3183 static __be32
3184 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3185 {
3186         struct xdr_stream *xdr = &resp->xdr;
3187         struct svc_fh *fhp = *fhpp;
3188         unsigned int len;
3189         __be32 *p;
3190 
3191         if (!nfserr) {
3192                 len = fhp->fh_handle.fh_size;
3193                 p = xdr_reserve_space(xdr, len + 4);
3194                 if (!p)
3195                         return nfserr_resource;
3196                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3197         }
3198         return nfserr;
3199 }
3200 
3201 /*
3202 * Including all fields other than the name, a LOCK4denied structure requires
3203 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3204 */
3205 static __be32
3206 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3207 {
3208         struct xdr_netobj *conf = &ld->ld_owner;
3209         __be32 *p;
3210 
3211 again:
3212         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3213         if (!p) {
3214                 /*
3215                  * Don't fail to return the result just because we can't
3216                  * return the conflicting open:
3217                  */
3218                 if (conf->len) {
3219                         kfree(conf->data);
3220                         conf->len = 0;
3221                         conf->data = NULL;
3222                         goto again;
3223                 }
3224                 return nfserr_resource;
3225         }
3226         p = xdr_encode_hyper(p, ld->ld_start);
3227         p = xdr_encode_hyper(p, ld->ld_length);
3228         *p++ = cpu_to_be32(ld->ld_type);
3229         if (conf->len) {
3230                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3231                 p = xdr_encode_opaque(p, conf->data, conf->len);
3232                 kfree(conf->data);
3233         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
3234                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3235                 *p++ = cpu_to_be32(0); /* length of owner name */
3236         }
3237         return nfserr_denied;
3238 }
3239 
3240 static __be32
3241 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3242 {
3243         struct xdr_stream *xdr = &resp->xdr;
3244 
3245         if (!nfserr)
3246                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3247         else if (nfserr == nfserr_denied)
3248                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3249 
3250         return nfserr;
3251 }
3252 
3253 static __be32
3254 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3255 {
3256         struct xdr_stream *xdr = &resp->xdr;
3257 
3258         if (nfserr == nfserr_denied)
3259                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3260         return nfserr;
3261 }
3262 
3263 static __be32
3264 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3265 {
3266         struct xdr_stream *xdr = &resp->xdr;
3267 
3268         if (!nfserr)
3269                 nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3270 
3271         return nfserr;
3272 }
3273 
3274 
3275 static __be32
3276 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3277 {
3278         struct xdr_stream *xdr = &resp->xdr;
3279         __be32 *p;
3280 
3281         if (!nfserr) {
3282                 p = xdr_reserve_space(xdr, 20);
3283                 if (!p)
3284                         return nfserr_resource;
3285                 p = encode_cinfo(p, &link->li_cinfo);
3286         }
3287         return nfserr;
3288 }
3289 
3290 
3291 static __be32
3292 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3293 {
3294         struct xdr_stream *xdr = &resp->xdr;
3295         __be32 *p;
3296 
3297         if (nfserr)
3298                 goto out;
3299 
3300         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3301         if (nfserr)
3302                 goto out;
3303         p = xdr_reserve_space(xdr, 24);
3304         if (!p)
3305                 return nfserr_resource;
3306         p = encode_cinfo(p, &open->op_cinfo);
3307         *p++ = cpu_to_be32(open->op_rflags);
3308 
3309         nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3310                                         open->op_bmval[2]);
3311         if (nfserr)
3312                 goto out;
3313 
3314         p = xdr_reserve_space(xdr, 4);
3315         if (!p)
3316                 return nfserr_resource;
3317 
3318         *p++ = cpu_to_be32(open->op_delegate_type);
3319         switch (open->op_delegate_type) {
3320         case NFS4_OPEN_DELEGATE_NONE:
3321                 break;
3322         case NFS4_OPEN_DELEGATE_READ:
3323                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3324                 if (nfserr)
3325                         return nfserr;
3326                 p = xdr_reserve_space(xdr, 20);
3327                 if (!p)
3328                         return nfserr_resource;
3329                 *p++ = cpu_to_be32(open->op_recall);
3330 
3331                 /*
3332                  * TODO: ACE's in delegations
3333                  */
3334                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3335                 *p++ = cpu_to_be32(0);
3336                 *p++ = cpu_to_be32(0);
3337                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3338                 break;
3339         case NFS4_OPEN_DELEGATE_WRITE:
3340                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3341                 if (nfserr)
3342                         return nfserr;
3343                 p = xdr_reserve_space(xdr, 32);
3344                 if (!p)
3345                         return nfserr_resource;
3346                 *p++ = cpu_to_be32(0);
3347 
3348                 /*
3349                  * TODO: space_limit's in delegations
3350                  */
3351                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3352                 *p++ = cpu_to_be32(~(u32)0);
3353                 *p++ = cpu_to_be32(~(u32)0);
3354 
3355                 /*
3356                  * TODO: ACE's in delegations
3357                  */
3358                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3359                 *p++ = cpu_to_be32(0);
3360                 *p++ = cpu_to_be32(0);
3361                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3362                 break;
3363         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3364                 switch (open->op_why_no_deleg) {
3365                 case WND4_CONTENTION:
3366                 case WND4_RESOURCE:
3367                         p = xdr_reserve_space(xdr, 8);
3368                         if (!p)
3369                                 return nfserr_resource;
3370                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3371                         /* deleg signaling not supported yet: */
3372                         *p++ = cpu_to_be32(0);
3373                         break;
3374                 default:
3375                         p = xdr_reserve_space(xdr, 4);
3376                         if (!p)
3377                                 return nfserr_resource;
3378                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3379                 }
3380                 break;
3381         default:
3382                 BUG();
3383         }
3384         /* XXX save filehandle here */
3385 out:
3386         return nfserr;
3387 }
3388 
3389 static __be32
3390 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3391 {
3392         struct xdr_stream *xdr = &resp->xdr;
3393 
3394         if (!nfserr)
3395                 nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3396 
3397         return nfserr;
3398 }
3399 
3400 static __be32
3401 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3402 {
3403         struct xdr_stream *xdr = &resp->xdr;
3404 
3405         if (!nfserr)
3406                 nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
3407 
3408         return nfserr;
3409 }
3410 
3411 static __be32 nfsd4_encode_splice_read(
3412                                 struct nfsd4_compoundres *resp,
3413                                 struct nfsd4_read *read,
3414                                 struct file *file, unsigned long maxcount)
3415 {
3416         struct xdr_stream *xdr = &resp->xdr;
3417         struct xdr_buf *buf = xdr->buf;
3418         u32 eof;
3419         long len;
3420         int space_left;
3421         __be32 nfserr;
3422         __be32 *p = xdr->p - 2;
3423 
3424         /* Make sure there will be room for padding if needed */
3425         if (xdr->end - xdr->p < 1)
3426                 return nfserr_resource;
3427 
3428         len = maxcount;
3429         nfserr = nfsd_splice_read(read->rd_rqstp, file,
3430                                   read->rd_offset, &maxcount);
3431         if (nfserr) {
3432                 /*
3433                  * nfsd_splice_actor may have already messed with the
3434                  * page length; reset it so as not to confuse
3435                  * xdr_truncate_encode:
3436                  */
3437                 buf->page_len = 0;
3438                 return nfserr;
3439         }
3440 
3441         eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3442                                 d_inode(read->rd_fhp->fh_dentry)->i_size);
3443 
3444         *(p++) = htonl(eof);
3445         *(p++) = htonl(maxcount);
3446 
3447         buf->page_len = maxcount;
3448         buf->len += maxcount;
3449         xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3450                                                         / PAGE_SIZE;
3451 
3452         /* Use rest of head for padding and remaining ops: */
3453         buf->tail[0].iov_base = xdr->p;
3454         buf->tail[0].iov_len = 0;
3455         xdr->iov = buf->tail;
3456         if (maxcount&3) {
3457                 int pad = 4 - (maxcount&3);
3458 
3459                 *(xdr->p++) = 0;
3460 
3461                 buf->tail[0].iov_base += maxcount&3;
3462                 buf->tail[0].iov_len = pad;
3463                 buf->len += pad;
3464         }
3465 
3466         space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3467                                 buf->buflen - buf->len);
3468         buf->buflen = buf->len + space_left;
3469         xdr->end = (__be32 *)((void *)xdr->end + space_left);
3470 
3471         return 0;
3472 }
3473 
3474 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3475                                  struct nfsd4_read *read,
3476                                  struct file *file, unsigned long maxcount)
3477 {
3478         struct xdr_stream *xdr = &resp->xdr;
3479         u32 eof;
3480         int v;
3481         int starting_len = xdr->buf->len - 8;
3482         long len;
3483         int thislen;
3484         __be32 nfserr;
3485         __be32 tmp;
3486         __be32 *p;
3487         u32 zzz = 0;
3488         int pad;
3489 
3490         len = maxcount;
3491         v = 0;
3492 
3493         thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3494         p = xdr_reserve_space(xdr, (thislen+3)&~3);
3495         WARN_ON_ONCE(!p);
3496         resp->rqstp->rq_vec[v].iov_base = p;
3497         resp->rqstp->rq_vec[v].iov_len = thislen;
3498         v++;
3499         len -= thislen;
3500 
3501         while (len) {
3502                 thislen = min_t(long, len, PAGE_SIZE);
3503                 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3504                 WARN_ON_ONCE(!p);
3505                 resp->rqstp->rq_vec[v].iov_base = p;
3506                 resp->rqstp->rq_vec[v].iov_len = thislen;
3507                 v++;
3508                 len -= thislen;
3509         }
3510         read->rd_vlen = v;
3511 
3512         len = maxcount;
3513         nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
3514                         read->rd_vlen, &maxcount);
3515         if (nfserr)
3516                 return nfserr;
3517         xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3518 
3519         eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3520                                 d_inode(read->rd_fhp->fh_dentry)->i_size);
3521 
3522         tmp = htonl(eof);
3523         write_bytes_to_xdr_buf(xdr->buf, starting_len    , &tmp, 4);
3524         tmp = htonl(maxcount);
3525         write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3526 
3527         pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3528         write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3529                                                                 &zzz, pad);
3530         return 0;
3531 
3532 }
3533 
3534 static __be32
3535 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3536                   struct nfsd4_read *read)
3537 {
3538         unsigned long maxcount;
3539         struct xdr_stream *xdr = &resp->xdr;
3540         struct file *file = read->rd_filp;
3541         int starting_len = xdr->buf->len;
3542         struct raparms *ra = NULL;
3543         __be32 *p;
3544 
3545         if (nfserr)
3546                 goto out;
3547 
3548         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3549         if (!p) {
3550                 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3551                 nfserr = nfserr_resource;
3552                 goto out;
3553         }
3554         if (resp->xdr.buf->page_len &&
3555             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3556                 WARN_ON_ONCE(1);
3557                 nfserr = nfserr_resource;
3558                 goto out;
3559         }
3560         xdr_commit_encode(xdr);
3561 
3562         maxcount = svc_max_payload(resp->rqstp);
3563         maxcount = min_t(unsigned long, maxcount,
3564                          (xdr->buf->buflen - xdr->buf->len));
3565         maxcount = min_t(unsigned long, maxcount, read->rd_length);
3566 
3567         if (read->rd_tmp_file)
3568                 ra = nfsd_init_raparms(file);
3569 
3570         if (file->f_op->splice_read &&
3571             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3572                 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
3573         else
3574                 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
3575 
3576         if (ra)
3577                 nfsd_put_raparams(file, ra);
3578 
3579         if (nfserr)
3580                 xdr_truncate_encode(xdr, starting_len);
3581 
3582 out:
3583         if (file)
3584                 fput(file);
3585         return nfserr;
3586 }
3587 
3588 static __be32
3589 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3590 {
3591         int maxcount;
3592         __be32 wire_count;
3593         int zero = 0;
3594         struct xdr_stream *xdr = &resp->xdr;
3595         int length_offset = xdr->buf->len;
3596         __be32 *p;
3597 
3598         if (nfserr)
3599                 return nfserr;
3600 
3601         p = xdr_reserve_space(xdr, 4);
3602         if (!p)
3603                 return nfserr_resource;
3604         maxcount = PAGE_SIZE;
3605 
3606         p = xdr_reserve_space(xdr, maxcount);
3607         if (!p)
3608                 return nfserr_resource;
3609         /*
3610          * XXX: By default, vfs_readlink() will truncate symlinks if they
3611          * would overflow the buffer.  Is this kosher in NFSv4?  If not, one
3612          * easy fix is: if vfs_readlink() precisely fills the buffer, assume
3613          * that truncation occurred, and return NFS4ERR_RESOURCE.
3614          */
3615         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3616                                                 (char *)p, &maxcount);
3617         if (nfserr == nfserr_isdir)
3618                 nfserr = nfserr_inval;
3619         if (nfserr) {
3620                 xdr_truncate_encode(xdr, length_offset);
3621                 return nfserr;
3622         }
3623 
3624         wire_count = htonl(maxcount);
3625         write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3626         xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3627         if (maxcount & 3)
3628                 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3629                                                 &zero, 4 - (maxcount&3));
3630         return 0;
3631 }
3632 
3633 static __be32
3634 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3635 {
3636         int maxcount;
3637         int bytes_left;
3638         loff_t offset;
3639         __be64 wire_offset;
3640         struct xdr_stream *xdr = &resp->xdr;
3641         int starting_len = xdr->buf->len;
3642         __be32 *p;
3643 
3644         if (nfserr)
3645                 return nfserr;
3646 
3647         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3648         if (!p)
3649                 return nfserr_resource;
3650 
3651         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3652         *p++ = cpu_to_be32(0);
3653         *p++ = cpu_to_be32(0);
3654         resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3655                                 - (char *)resp->xdr.buf->head[0].iov_base;
3656 
3657         /*
3658          * Number of bytes left for directory entries allowing for the
3659          * final 8 bytes of the readdir and a following failed op:
3660          */
3661         bytes_left = xdr->buf->buflen - xdr->buf->len
3662                         - COMPOUND_ERR_SLACK_SPACE - 8;
3663         if (bytes_left < 0) {
3664                 nfserr = nfserr_resource;
3665                 goto err_no_verf;
3666         }
3667         maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX);
3668         /*
3669          * Note the rfc defines rd_maxcount as the size of the
3670          * READDIR4resok structure, which includes the verifier above
3671          * and the 8 bytes encoded at the end of this function:
3672          */
3673         if (maxcount < 16) {
3674                 nfserr = nfserr_toosmall;
3675                 goto err_no_verf;
3676         }
3677         maxcount = min_t(int, maxcount-16, bytes_left);
3678 
3679         /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3680         if (!readdir->rd_dircount)
3681                 readdir->rd_dircount = INT_MAX;
3682 
3683         readdir->xdr = xdr;
3684         readdir->rd_maxcount = maxcount;
3685         readdir->common.err = 0;
3686         readdir->cookie_offset = 0;
3687 
3688         offset = readdir->rd_cookie;
3689         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3690                               &offset,
3691                               &readdir->common, nfsd4_encode_dirent);
3692         if (nfserr == nfs_ok &&
3693             readdir->common.err == nfserr_toosmall &&
3694             xdr->buf->len == starting_len + 8) {
3695                 /* nothing encoded; which limit did we hit?: */
3696                 if (maxcount - 16 < bytes_left)
3697                         /* It was the fault of rd_maxcount: */
3698                         nfserr = nfserr_toosmall;
3699                 else
3700                         /* We ran out of buffer space: */
3701                         nfserr = nfserr_resource;
3702         }
3703         if (nfserr)
3704                 goto err_no_verf;
3705 
3706         if (readdir->cookie_offset) {
3707                 wire_offset = cpu_to_be64(offset);
3708                 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3709                                                         &wire_offset, 8);
3710         }
3711 
3712         p = xdr_reserve_space(xdr, 8);
3713         if (!p) {
3714                 WARN_ON_ONCE(1);
3715                 goto err_no_verf;
3716         }
3717         *p++ = 0;       /* no more entries */
3718         *p++ = htonl(readdir->common.err == nfserr_eof);
3719 
3720         return 0;
3721 err_no_verf:
3722         xdr_truncate_encode(xdr, starting_len);
3723         return nfserr;
3724 }
3725 
3726 static __be32
3727 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3728 {
3729         struct xdr_stream *xdr = &resp->xdr;
3730         __be32 *p;
3731 
3732         if (!nfserr) {
3733                 p = xdr_reserve_space(xdr, 20);
3734                 if (!p)
3735                         return nfserr_resource;
3736                 p = encode_cinfo(p, &remove->rm_cinfo);
3737         }
3738         return nfserr;
3739 }
3740 
3741 static __be32
3742 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3743 {
3744         struct xdr_stream *xdr = &resp->xdr;
3745         __be32 *p;
3746 
3747         if (!nfserr) {
3748                 p = xdr_reserve_space(xdr, 40);
3749                 if (!p)
3750                         return nfserr_resource;
3751                 p = encode_cinfo(p, &rename->rn_sinfo);
3752                 p = encode_cinfo(p, &rename->rn_tinfo);
3753         }
3754         return nfserr;
3755 }
3756 
3757 static __be32
3758 nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3759                          __be32 nfserr, struct svc_export *exp)
3760 {
3761         u32 i, nflavs, supported;
3762         struct exp_flavor_info *flavs;
3763         struct exp_flavor_info def_flavs[2];
3764         __be32 *p, *flavorsp;
3765         static bool report = true;
3766 
3767         if (nfserr)
3768                 goto out;
3769         nfserr = nfserr_resource;
3770         if (exp->ex_nflavors) {
3771                 flavs = exp->ex_flavors;
3772                 nflavs = exp->ex_nflavors;
3773         } else { /* Handling of some defaults in absence of real secinfo: */
3774                 flavs = def_flavs;
3775                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3776                         nflavs = 2;
3777                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3778                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3779                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3780                         nflavs = 1;
3781                         flavs[0].pseudoflavor
3782                                         = svcauth_gss_flavor(exp->ex_client);
3783                 } else {
3784                         nflavs = 1;
3785                         flavs[0].pseudoflavor
3786                                         = exp->ex_client->flavour->flavour;
3787                 }
3788         }
3789 
3790         supported = 0;
3791         p = xdr_reserve_space(xdr, 4);
3792         if (!p)
3793                 goto out;
3794         flavorsp = p++;         /* to be backfilled later */
3795 
3796         for (i = 0; i < nflavs; i++) {
3797                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3798                 struct rpcsec_gss_info info;
3799 
3800                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3801                         supported++;
3802                         p = xdr_reserve_space(xdr, 4 + 4 +
3803                                               XDR_LEN(info.oid.len) + 4 + 4);
3804                         if (!p)
3805                                 goto out;
3806                         *p++ = cpu_to_be32(RPC_AUTH_GSS);
3807                         p = xdr_encode_opaque(p,  info.oid.data, info.oid.len);
3808                         *p++ = cpu_to_be32(info.qop);
3809                         *p++ = cpu_to_be32(info.service);
3810                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3811                         supported++;
3812                         p = xdr_reserve_space(xdr, 4);
3813                         if (!p)
3814                                 goto out;
3815                         *p++ = cpu_to_be32(pf);
3816                 } else {
3817                         if (report)
3818                                 pr_warn("NFS: SECINFO: security flavor %u "
3819                                         "is not supported\n", pf);
3820                 }
3821         }
3822 
3823         if (nflavs != supported)
3824                 report = false;
3825         *flavorsp = htonl(supported);
3826         nfserr = 0;
3827 out:
3828         if (exp)
3829                 exp_put(exp);
3830         return nfserr;
3831 }
3832 
3833 static __be32
3834 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3835                      struct nfsd4_secinfo *secinfo)
3836 {
3837         struct xdr_stream *xdr = &resp->xdr;
3838 
3839         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3840 }
3841 
3842 static __be32
3843 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3844                      struct nfsd4_secinfo_no_name *secinfo)
3845 {
3846         struct xdr_stream *xdr = &resp->xdr;
3847 
3848         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3849 }
3850 
3851 /*
3852  * The SETATTR encode routine is special -- it always encodes a bitmap,
3853  * regardless of the error status.
3854  */
3855 static __be32
3856 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3857 {
3858         struct xdr_stream *xdr = &resp->xdr;
3859         __be32 *p;
3860 
3861         p = xdr_reserve_space(xdr, 16);
3862         if (!p)
3863                 return nfserr_resource;
3864         if (nfserr) {
3865                 *p++ = cpu_to_be32(3);
3866                 *p++ = cpu_to_be32(0);
3867                 *p++ = cpu_to_be32(0);
3868                 *p++ = cpu_to_be32(0);
3869         }
3870         else {
3871                 *p++ = cpu_to_be32(3);
3872                 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3873                 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3874                 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3875         }
3876         return nfserr;
3877 }
3878 
3879 static __be32
3880 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3881 {
3882         struct xdr_stream *xdr = &resp->xdr;
3883         __be32 *p;
3884 
3885         if (!nfserr) {
3886                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3887                 if (!p)
3888                         return nfserr_resource;
3889                 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3890                 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3891                                                 NFS4_VERIFIER_SIZE);
3892         }
3893         else if (nfserr == nfserr_clid_inuse) {
3894                 p = xdr_reserve_space(xdr, 8);
3895                 if (!p)
3896                         return nfserr_resource;
3897                 *p++ = cpu_to_be32(0);
3898                 *p++ = cpu_to_be32(0);
3899         }
3900         return nfserr;
3901 }
3902 
3903 static __be32
3904 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3905 {
3906         struct xdr_stream *xdr = &resp->xdr;
3907         __be32 *p;
3908 
3909         if (!nfserr) {
3910                 p = xdr_reserve_space(xdr, 16);
3911                 if (!p)
3912                         return nfserr_resource;
3913                 *p++ = cpu_to_be32(write->wr_bytes_written);
3914                 *p++ = cpu_to_be32(write->wr_how_written);
3915                 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3916                                                         NFS4_VERIFIER_SIZE);
3917         }
3918         return nfserr;
3919 }
3920 
3921 static __be32
3922 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3923                          struct nfsd4_exchange_id *exid)
3924 {
3925         struct xdr_stream *xdr = &resp->xdr;
3926         __be32 *p;
3927         char *major_id;
3928         char *server_scope;
3929         int major_id_sz;
3930         int server_scope_sz;
3931         int status = 0;
3932         uint64_t minor_id = 0;
3933 
3934         if (nfserr)
3935                 return nfserr;
3936 
3937         major_id = utsname()->nodename;
3938         major_id_sz = strlen(major_id);
3939         server_scope = utsname()->nodename;
3940         server_scope_sz = strlen(server_scope);
3941 
3942         p = xdr_reserve_space(xdr,
3943                 8 /* eir_clientid */ +
3944                 4 /* eir_sequenceid */ +
3945                 4 /* eir_flags */ +
3946                 4 /* spr_how */);
3947         if (!p)
3948                 return nfserr_resource;
3949 
3950         p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3951         *p++ = cpu_to_be32(exid->seqid);
3952         *p++ = cpu_to_be32(exid->flags);
3953 
3954         *p++ = cpu_to_be32(exid->spa_how);
3955 
3956         switch (exid->spa_how) {
3957         case SP4_NONE:
3958                 break;
3959         case SP4_MACH_CRED:
3960                 /* spo_must_enforce bitmap: */
3961                 status = nfsd4_encode_bitmap(xdr,
3962                                         exid->spo_must_enforce[0],
3963                                         exid->spo_must_enforce[1],
3964                                         exid->spo_must_enforce[2]);
3965                 if (status)
3966                         goto out;
3967                 /* spo_must_allow bitmap: */
3968                 status = nfsd4_encode_bitmap(xdr,
3969                                         exid->spo_must_allow[0],
3970                                         exid->spo_must_allow[1],
3971                                         exid->spo_must_allow[2]);
3972                 if (status)
3973                         goto out;
3974                 break;
3975         default:
3976                 WARN_ON_ONCE(1);
3977         }
3978 
3979         p = xdr_reserve_space(xdr,
3980                 8 /* so_minor_id */ +
3981                 4 /* so_major_id.len */ +
3982                 (XDR_QUADLEN(major_id_sz) * 4) +
3983                 4 /* eir_server_scope.len */ +
3984                 (XDR_QUADLEN(server_scope_sz) * 4) +
3985                 4 /* eir_server_impl_id.count (0) */);
3986         if (!p)
3987                 return nfserr_resource;
3988 
3989         /* The server_owner struct */
3990         p = xdr_encode_hyper(p, minor_id);      /* Minor id */
3991         /* major id */
3992         p = xdr_encode_opaque(p, major_id, major_id_sz);
3993 
3994         /* Server scope */
3995         p = xdr_encode_opaque(p, server_scope, server_scope_sz);
3996 
3997         /* Implementation id */
3998         *p++ = cpu_to_be32(0);  /* zero length nfs_impl_id4 array */
3999         return 0;
4000 out:
4001         return status;
4002 }
4003 
4004 static __be32
4005 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
4006                             struct nfsd4_create_session *sess)
4007 {
4008         struct xdr_stream *xdr = &resp->xdr;
4009         __be32 *p;
4010 
4011         if (nfserr)
4012                 return nfserr;
4013 
4014         p = xdr_reserve_space(xdr, 24);
4015         if (!p)
4016                 return nfserr_resource;
4017         p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
4018                                         NFS4_MAX_SESSIONID_LEN);
4019         *p++ = cpu_to_be32(sess->seqid);
4020         *p++ = cpu_to_be32(sess->flags);
4021 
4022         p = xdr_reserve_space(xdr, 28);
4023         if (!p)
4024                 return nfserr_resource;
4025         *p++ = cpu_to_be32(0); /* headerpadsz */
4026         *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
4027         *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
4028         *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
4029         *p++ = cpu_to_be32(sess->fore_channel.maxops);
4030         *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
4031         *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
4032 
4033         if (sess->fore_channel.nr_rdma_attrs) {
4034                 p = xdr_reserve_space(xdr, 4);
4035                 if (!p)
4036                         return nfserr_resource;
4037                 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
4038         }
4039 
4040         p = xdr_reserve_space(xdr, 28);
4041         if (!p)
4042                 return nfserr_resource;
4043         *p++ = cpu_to_be32(0); /* headerpadsz */
4044         *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
4045         *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
4046         *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
4047         *p++ = cpu_to_be32(sess->back_channel.maxops);
4048         *p++ = cpu_to_be32(sess->back_channel.maxreqs);
4049         *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
4050 
4051         if (sess->back_channel.nr_rdma_attrs) {
4052                 p = xdr_reserve_space(xdr, 4);
4053                 if (!p)
4054                         return nfserr_resource;
4055                 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
4056         }
4057         return 0;
4058 }
4059 
4060 static __be32
4061 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4062                       struct nfsd4_sequence *seq)
4063 {
4064         struct xdr_stream *xdr = &resp->xdr;
4065         __be32 *p;
4066 
4067         if (nfserr)
4068                 return nfserr;
4069 
4070         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4071         if (!p)
4072                 return nfserr_resource;
4073         p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4074                                         NFS4_MAX_SESSIONID_LEN);
4075         *p++ = cpu_to_be32(seq->seqid);
4076         *p++ = cpu_to_be32(seq->slotid);
4077         /* Note slotid's are numbered from zero: */
4078         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4079         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4080         *p++ = cpu_to_be32(seq->status_flags);
4081 
4082         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4083         return 0;
4084 }
4085 
4086 static __be32
4087 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4088                           struct nfsd4_test_stateid *test_stateid)
4089 {
4090         struct xdr_stream *xdr = &resp->xdr;
4091         struct nfsd4_test_stateid_id *stateid, *next;
4092         __be32 *p;
4093 
4094         if (nfserr)
4095                 return nfserr;
4096 
4097         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4098         if (!p)
4099                 return nfserr_resource;
4100         *p++ = htonl(test_stateid->ts_num_ids);
4101 
4102         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4103                 *p++ = stateid->ts_id_status;
4104         }
4105 
4106         return nfserr;
4107 }
4108 
4109 #ifdef CONFIG_NFSD_PNFS
4110 static __be32
4111 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4112                 struct nfsd4_getdeviceinfo *gdev)
4113 {
4114         struct xdr_stream *xdr = &resp->xdr;
4115         const struct nfsd4_layout_ops *ops =
4116                 nfsd4_layout_ops[gdev->gd_layout_type];
4117         u32 starting_len = xdr->buf->len, needed_len;
4118         __be32 *p;
4119 
4120         dprintk("%s: err %d\n", __func__, be32_to_cpu(nfserr));
4121         if (nfserr)
4122                 goto out;
4123 
4124         nfserr = nfserr_resource;
4125         p = xdr_reserve_space(xdr, 4);
4126         if (!p)
4127                 goto out;
4128 
4129         *p++ = cpu_to_be32(gdev->gd_layout_type);
4130 
4131         /* If maxcount is 0 then just update notifications */
4132         if (gdev->gd_maxcount != 0) {
4133                 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4134                 if (nfserr) {
4135                         /*
4136                          * We don't bother to burden the layout drivers with
4137                          * enforcing gd_maxcount, just tell the client to
4138                          * come back with a bigger buffer if it's not enough.
4139                          */
4140                         if (xdr->buf->len + 4 > gdev->gd_maxcount)
4141                                 goto toosmall;
4142                         goto out;
4143                 }
4144         }
4145 
4146         nfserr = nfserr_resource;
4147         if (gdev->gd_notify_types) {
4148                 p = xdr_reserve_space(xdr, 4 + 4);
4149                 if (!p)
4150                         goto out;
4151                 *p++ = cpu_to_be32(1);                  /* bitmap length */
4152                 *p++ = cpu_to_be32(gdev->gd_notify_types);
4153         } else {
4154                 p = xdr_reserve_space(xdr, 4);
4155                 if (!p)
4156                         goto out;
4157                 *p++ = 0;
4158         }
4159 
4160         nfserr = 0;
4161 out:
4162         kfree(gdev->gd_device);
4163         dprintk("%s: done: %d\n", __func__, be32_to_cpu(nfserr));
4164         return nfserr;
4165 
4166 toosmall:
4167         dprintk("%s: maxcount too small\n", __func__);
4168         needed_len = xdr->buf->len + 4 /* notifications */;
4169         xdr_truncate_encode(xdr, starting_len);
4170         p = xdr_reserve_space(xdr, 4);
4171         if (!p) {
4172                 nfserr = nfserr_resource;
4173         } else {
4174                 *p++ = cpu_to_be32(needed_len);
4175                 nfserr = nfserr_toosmall;
4176         }
4177         goto out;
4178 }
4179 
4180 static __be32
4181 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4182                 struct nfsd4_layoutget *lgp)
4183 {
4184         struct xdr_stream *xdr = &resp->xdr;
4185         const struct nfsd4_layout_ops *ops =
4186                 nfsd4_layout_ops[lgp->lg_layout_type];
4187         __be32 *p;
4188 
4189         dprintk("%s: err %d\n", __func__, nfserr);
4190         if (nfserr)
4191                 goto out;
4192 
4193         nfserr = nfserr_resource;
4194         p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4195         if (!p)
4196                 goto out;
4197 
4198         *p++ = cpu_to_be32(1);  /* we always set return-on-close */
4199         *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4200         p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4201                                     sizeof(stateid_opaque_t));
4202 
4203         *p++ = cpu_to_be32(1);  /* we always return a single layout */
4204         p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4205         p = xdr_encode_hyper(p, lgp->lg_seg.length);
4206         *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4207         *p++ = cpu_to_be32(lgp->lg_layout_type);
4208 
4209         nfserr = ops->encode_layoutget(xdr, lgp);
4210 out:
4211         kfree(lgp->lg_content);
4212         return nfserr;
4213 }
4214 
4215 static __be32
4216 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4217                           struct nfsd4_layoutcommit *lcp)
4218 {
4219         struct xdr_stream *xdr = &resp->xdr;
4220         __be32 *p;
4221 
4222         if (nfserr)
4223                 return nfserr;
4224 
4225         p = xdr_reserve_space(xdr, 4);
4226         if (!p)
4227                 return nfserr_resource;
4228         *p++ = cpu_to_be32(lcp->lc_size_chg);
4229         if (lcp->lc_size_chg) {
4230                 p = xdr_reserve_space(xdr, 8);
4231                 if (!p)
4232                         return nfserr_resource;
4233                 p = xdr_encode_hyper(p, lcp->lc_newsize);
4234         }
4235 
4236         return nfs_ok;
4237 }
4238 
4239 static __be32
4240 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4241                 struct nfsd4_layoutreturn *lrp)
4242 {
4243         struct xdr_stream *xdr = &resp->xdr;
4244         __be32 *p;
4245 
4246         if (nfserr)
4247                 return nfserr;
4248 
4249         p = xdr_reserve_space(xdr, 4);
4250         if (!p)
4251                 return nfserr_resource;
4252         *p++ = cpu_to_be32(lrp->lrs_present);
4253         if (lrp->lrs_present)
4254                 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4255         return nfs_ok;
4256 }
4257 #endif /* CONFIG_NFSD_PNFS */
4258 
4259 static __be32
4260 nfsd42_encode_write_res(struct nfsd4_compoundres *resp, struct nfsd42_write_res *write)
4261 {
4262         __be32 *p;
4263 
4264         p = xdr_reserve_space(&resp->xdr, 4 + 8 + 4 + NFS4_VERIFIER_SIZE);
4265         if (!p)
4266                 return nfserr_resource;
4267 
4268         *p++ = cpu_to_be32(0);
4269         p = xdr_encode_hyper(p, write->wr_bytes_written);
4270         *p++ = cpu_to_be32(write->wr_stable_how);
4271         p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4272                                     NFS4_VERIFIER_SIZE);
4273         return nfs_ok;
4274 }
4275 
4276 static __be32
4277 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
4278                   struct nfsd4_copy *copy)
4279 {
4280         __be32 *p;
4281 
4282         if (!nfserr) {
4283                 nfserr = nfsd42_encode_write_res(resp, &copy->cp_res);
4284                 if (nfserr)
4285                         return nfserr;
4286 
4287                 p = xdr_reserve_space(&resp->xdr, 4 + 4);
4288                 *p++ = cpu_to_be32(copy->cp_consecutive);
4289                 *p++ = cpu_to_be32(copy->cp_synchronous);
4290         }
4291         return nfserr;
4292 }
4293 
4294 static __be32
4295 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4296                   struct nfsd4_seek *seek)
4297 {
4298         __be32 *p;
4299 
4300         if (nfserr)
4301                 return nfserr;
4302 
4303         p = xdr_reserve_space(&resp->xdr, 4 + 8);
4304         *p++ = cpu_to_be32(seek->seek_eof);
4305         p = xdr_encode_hyper(p, seek->seek_pos);
4306 
4307         return nfserr;
4308 }
4309 
4310 static __be32
4311 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4312 {
4313         return nfserr;
4314 }
4315 
4316 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4317 
4318 /*
4319  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4320  * since we don't need to filter out obsolete ops as this is
4321  * done in the decoding phase.
4322  */
4323 static nfsd4_enc nfsd4_enc_ops[] = {
4324         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
4325         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
4326         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
4327         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
4328         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
4329         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
4330         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
4331         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
4332         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
4333         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
4334         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
4335         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
4336         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
4337         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
4338         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
4339         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
4340         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
4341         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
4342         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
4343         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
4344         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
4345         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
4346         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
4347         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
4348         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
4349         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
4350         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
4351         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
4352         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
4353         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
4354         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
4355         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
4356         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
4357         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4358         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
4359         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
4360         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
4361 
4362         /* NFSv4.1 operations */
4363         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
4364         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4365         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
4366         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
4367         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
4368         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
4369         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4370 #ifdef CONFIG_NFSD_PNFS
4371         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4372         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4373         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_layoutcommit,
4374         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_layoutget,
4375         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_layoutreturn,
4376 #else
4377         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
4378         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4379         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
4380         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
4381         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
4382 #endif
4383         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4384         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
4385         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
4386         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
4387         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
4388         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
4389         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
4390 
4391         /* NFSv4.2 operations */
4392         [OP_ALLOCATE]           = (nfsd4_enc)nfsd4_encode_noop,
4393         [OP_COPY]               = (nfsd4_enc)nfsd4_encode_copy,
4394         [OP_COPY_NOTIFY]        = (nfsd4_enc)nfsd4_encode_noop,
4395         [OP_DEALLOCATE]         = (nfsd4_enc)nfsd4_encode_noop,
4396         [OP_IO_ADVISE]          = (nfsd4_enc)nfsd4_encode_noop,
4397         [OP_LAYOUTERROR]        = (nfsd4_enc)nfsd4_encode_noop,
4398         [OP_LAYOUTSTATS]        = (nfsd4_enc)nfsd4_encode_noop,
4399         [OP_OFFLOAD_CANCEL]     = (nfsd4_enc)nfsd4_encode_noop,
4400         [OP_OFFLOAD_STATUS]     = (nfsd4_enc)nfsd4_encode_noop,
4401         [OP_READ_PLUS]          = (nfsd4_enc)nfsd4_encode_noop,
4402         [OP_SEEK]               = (nfsd4_enc)nfsd4_encode_seek,
4403         [OP_WRITE_SAME]         = (nfsd4_enc)nfsd4_encode_noop,
4404         [OP_CLONE]              = (nfsd4_enc)nfsd4_encode_noop,
4405 };
4406 
4407 /*
4408  * Calculate whether we still have space to encode repsize bytes.
4409  * There are two considerations:
4410  *     - For NFS versions >=4.1, the size of the reply must stay within
4411  *       session limits
4412  *     - For all NFS versions, we must stay within limited preallocated
4413  *       buffer space.
4414  *
4415  * This is called before the operation is processed, so can only provide
4416  * an upper estimate.  For some nonidempotent operations (such as
4417  * getattr), it's not necessarily a problem if that estimate is wrong,
4418  * as we can fail it after processing without significant side effects.
4419  */
4420 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
4421 {
4422         struct xdr_buf *buf = &resp->rqstp->rq_res;
4423         struct nfsd4_slot *slot = resp->cstate.slot;
4424 
4425         if (buf->len + respsize <= buf->buflen)
4426                 return nfs_ok;
4427         if (!nfsd4_has_session(&resp->cstate))
4428                 return nfserr_resource;
4429         if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
4430                 WARN_ON_ONCE(1);
4431                 return nfserr_rep_too_big_to_cache;
4432         }
4433         return nfserr_rep_too_big;
4434 }
4435 
4436 void
4437 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
4438 {
4439         struct xdr_stream *xdr = &resp->xdr;
4440         struct nfs4_stateowner *so = resp->cstate.replay_owner;
4441         struct svc_rqst *rqstp = resp->rqstp;
4442         int post_err_offset;
4443         nfsd4_enc encoder;
4444         __be32 *p;
4445 
4446         p = xdr_reserve_space(xdr, 8);
4447         if (!p) {
4448                 WARN_ON_ONCE(1);
4449                 return;
4450         }
4451         *p++ = cpu_to_be32(op->opnum);
4452         post_err_offset = xdr->buf->len;
4453 
4454         if (op->opnum == OP_ILLEGAL)
4455                 goto status;
4456         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
4457                !nfsd4_enc_ops[op->opnum]);
4458         encoder = nfsd4_enc_ops[op->opnum];
4459         op->status = encoder(resp, op->status, &op->u);
4460         xdr_commit_encode(xdr);
4461 
4462         /* nfsd4_check_resp_size guarantees enough room for error status */
4463         if (!op->status) {
4464                 int space_needed = 0;
4465                 if (!nfsd4_last_compound_op(rqstp))
4466                         space_needed = COMPOUND_ERR_SLACK_SPACE;
4467                 op->status = nfsd4_check_resp_size(resp, space_needed);
4468         }
4469         if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
4470                 struct nfsd4_slot *slot = resp->cstate.slot;
4471 
4472                 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
4473                         op->status = nfserr_rep_too_big_to_cache;
4474                 else
4475                         op->status = nfserr_rep_too_big;
4476         }
4477         if (op->status == nfserr_resource ||
4478             op->status == nfserr_rep_too_big ||
4479             op->status == nfserr_rep_too_big_to_cache) {
4480                 /*
4481                  * The operation may have already been encoded or
4482                  * partially encoded.  No op returns anything additional
4483                  * in the case of one of these three errors, so we can
4484                  * just truncate back to after the status.  But it's a
4485                  * bug if we had to do this on a non-idempotent op:
4486                  */
4487                 warn_on_nonidempotent_op(op);
4488                 xdr_truncate_encode(xdr, post_err_offset);
4489         }
4490         if (so) {
4491                 int len = xdr->buf->len - post_err_offset;
4492 
4493                 so->so_replay.rp_status = op->status;
4494                 so->so_replay.rp_buflen = len;
4495                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4496                                                 so->so_replay.rp_buf, len);
4497         }
4498 status:
4499         /* Note that op->status is already in network byte order: */
4500         write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4501 }
4502 
4503 /* 
4504  * Encode the reply stored in the stateowner reply cache 
4505  * 
4506  * XDR note: do not encode rp->rp_buflen: the buffer contains the
4507  * previously sent already encoded operation.
4508  */
4509 void
4510 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4511 {
4512         __be32 *p;
4513         struct nfs4_replay *rp = op->replay;
4514 
4515         BUG_ON(!rp);
4516 
4517         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4518         if (!p) {
4519                 WARN_ON_ONCE(1);
4520                 return;
4521         }
4522         *p++ = cpu_to_be32(op->opnum);
4523         *p++ = rp->rp_status;  /* already xdr'ed */
4524 
4525         p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4526 }
4527 
4528 int
4529 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
4530 {
4531         return xdr_ressize_check(rqstp, p);
4532 }
4533 
4534 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
4535 {
4536         struct svc_rqst *rqstp = rq;
4537         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4538 
4539         if (args->ops != args->iops) {
4540                 kfree(args->ops);
4541                 args->ops = args->iops;
4542         }
4543         kfree(args->tmpp);
4544         args->tmpp = NULL;
4545         while (args->to_free) {
4546                 struct svcxdr_tmpbuf *tb = args->to_free;
4547                 args->to_free = tb->next;
4548                 kfree(tb);
4549         }
4550         return 1;
4551 }
4552 
4553 int
4554 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
4555 {
4556         if (rqstp->rq_arg.head[0].iov_len % 4) {
4557                 /* client is nuts */
4558                 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4559                         __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4560                 return 0;
4561         }
4562         args->p = p;
4563         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4564         args->pagelist = rqstp->rq_arg.pages;
4565         args->pagelen = rqstp->rq_arg.page_len;
4566         args->tmpp = NULL;
4567         args->to_free = NULL;
4568         args->ops = args->iops;
4569         args->rqstp = rqstp;
4570 
4571         return !nfsd4_decode_compound(args);
4572 }
4573 
4574 int
4575 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
4576 {
4577         /*
4578          * All that remains is to write the tag and operation count...
4579          */
4580         struct xdr_buf *buf = resp->xdr.buf;
4581 
4582         WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4583                                  buf->tail[0].iov_len);
4584 
4585         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4586 
4587         p = resp->tagp;
4588         *p++ = htonl(resp->taglen);
4589         memcpy(p, resp->tag, resp->taglen);
4590         p += XDR_QUADLEN(resp->taglen);
4591         *p++ = htonl(resp->opcnt);
4592 
4593         nfsd4_sequence_done(resp);
4594         return 1;
4595 }
4596 
4597 /*
4598  * Local variables:
4599  *  c-basic-offset: 8
4600  * End:
4601  */
4602 

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