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

Version: ~ [ linux-5.6-rc3 ] ~ [ linux-5.5.7 ] ~ [ linux-5.4.23 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.107 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.172 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.215 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.215 ] ~ [ 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-3.16.82 ] ~ [ 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  * TODO: Neil Brown made the following observation:  We currently
 36  * initially reserve NFSD_BUFSIZE space on the transmit queue and
 37  * never release any of that until the request is complete.
 38  * It would be good to calculate a new maximum response size while
 39  * decoding the COMPOUND, and call svc_reserve with this number
 40  * at the end of nfs4svc_decode_compoundargs.
 41  */
 42 
 43 #include <linux/slab.h>
 44 #include <linux/namei.h>
 45 #include <linux/statfs.h>
 46 #include <linux/utsname.h>
 47 #include <linux/pagemap.h>
 48 #include <linux/sunrpc/svcauth_gss.h>
 49 
 50 #include "idmap.h"
 51 #include "acl.h"
 52 #include "xdr4.h"
 53 #include "vfs.h"
 54 #include "state.h"
 55 #include "cache.h"
 56 #include "netns.h"
 57 
 58 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
 59 #include <linux/security.h>
 60 #endif
 61 
 62 
 63 #define NFSDDBG_FACILITY                NFSDDBG_XDR
 64 
 65 /*
 66  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
 67  * directory in order to indicate to the client that a filesystem boundary is present
 68  * We use a fixed fsid for a referral
 69  */
 70 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
 71 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
 72 
 73 static __be32
 74 check_filename(char *str, int len)
 75 {
 76         int i;
 77 
 78         if (len == 0)
 79                 return nfserr_inval;
 80         if (isdotent(str, len))
 81                 return nfserr_badname;
 82         for (i = 0; i < len; i++)
 83                 if (str[i] == '/')
 84                         return nfserr_badname;
 85         return 0;
 86 }
 87 
 88 #define DECODE_HEAD                             \
 89         __be32 *p;                              \
 90         __be32 status
 91 #define DECODE_TAIL                             \
 92         status = 0;                             \
 93 out:                                            \
 94         return status;                          \
 95 xdr_error:                                      \
 96         dprintk("NFSD: xdr error (%s:%d)\n",    \
 97                         __FILE__, __LINE__);    \
 98         status = nfserr_bad_xdr;                \
 99         goto out
100 
101 #define READ32(x)         (x) = ntohl(*p++)
102 #define READ64(x)         do {                  \
103         (x) = (u64)ntohl(*p++) << 32;           \
104         (x) |= ntohl(*p++);                     \
105 } while (0)
106 #define READTIME(x)       do {                  \
107         p++;                                    \
108         (x) = ntohl(*p++);                      \
109         p++;                                    \
110 } while (0)
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 static int
194 defer_free(struct nfsd4_compoundargs *argp,
195                 void (*release)(const void *), void *p)
196 {
197         struct tmpbuf *tb;
198 
199         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
200         if (!tb)
201                 return -ENOMEM;
202         tb->buf = p;
203         tb->release = release;
204         tb->next = argp->to_free;
205         argp->to_free = tb;
206         return 0;
207 }
208 
209 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
210 {
211         if (p == argp->tmp) {
212                 p = kmemdup(argp->tmp, nbytes, GFP_KERNEL);
213                 if (!p)
214                         return NULL;
215         } else {
216                 BUG_ON(p != argp->tmpp);
217                 argp->tmpp = NULL;
218         }
219         if (defer_free(argp, kfree, p)) {
220                 kfree(p);
221                 return NULL;
222         } else
223                 return (char *)p;
224 }
225 
226 static __be32
227 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
228 {
229         u32 bmlen;
230         DECODE_HEAD;
231 
232         bmval[0] = 0;
233         bmval[1] = 0;
234         bmval[2] = 0;
235 
236         READ_BUF(4);
237         READ32(bmlen);
238         if (bmlen > 1000)
239                 goto xdr_error;
240 
241         READ_BUF(bmlen << 2);
242         if (bmlen > 0)
243                 READ32(bmval[0]);
244         if (bmlen > 1)
245                 READ32(bmval[1]);
246         if (bmlen > 2)
247                 READ32(bmval[2]);
248 
249         DECODE_TAIL;
250 }
251 
252 static __be32
253 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
254                    struct iattr *iattr, struct nfs4_acl **acl,
255                    struct xdr_netobj *label)
256 {
257         int expected_len, len = 0;
258         u32 dummy32;
259         char *buf;
260         int host_err;
261 
262         DECODE_HEAD;
263         iattr->ia_valid = 0;
264         if ((status = nfsd4_decode_bitmap(argp, bmval)))
265                 return status;
266 
267         READ_BUF(4);
268         READ32(expected_len);
269 
270         if (bmval[0] & FATTR4_WORD0_SIZE) {
271                 READ_BUF(8);
272                 len += 8;
273                 READ64(iattr->ia_size);
274                 iattr->ia_valid |= ATTR_SIZE;
275         }
276         if (bmval[0] & FATTR4_WORD0_ACL) {
277                 u32 nace;
278                 struct nfs4_ace *ace;
279 
280                 READ_BUF(4); len += 4;
281                 READ32(nace);
282 
283                 if (nace > NFS4_ACL_MAX)
284                         return nfserr_resource;
285 
286                 *acl = nfs4_acl_new(nace);
287                 if (*acl == NULL) {
288                         host_err = -ENOMEM;
289                         goto out_nfserr;
290                 }
291                 defer_free(argp, kfree, *acl);
292 
293                 (*acl)->naces = nace;
294                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
295                         READ_BUF(16); len += 16;
296                         READ32(ace->type);
297                         READ32(ace->flag);
298                         READ32(ace->access_mask);
299                         READ32(dummy32);
300                         READ_BUF(dummy32);
301                         len += XDR_QUADLEN(dummy32) << 2;
302                         READMEM(buf, dummy32);
303                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
304                         status = nfs_ok;
305                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
306                                 ;
307                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
308                                 status = nfsd_map_name_to_gid(argp->rqstp,
309                                                 buf, dummy32, &ace->who_gid);
310                         else
311                                 status = nfsd_map_name_to_uid(argp->rqstp,
312                                                 buf, dummy32, &ace->who_uid);
313                         if (status)
314                                 return status;
315                 }
316         } else
317                 *acl = NULL;
318         if (bmval[1] & FATTR4_WORD1_MODE) {
319                 READ_BUF(4);
320                 len += 4;
321                 READ32(iattr->ia_mode);
322                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
323                 iattr->ia_valid |= ATTR_MODE;
324         }
325         if (bmval[1] & FATTR4_WORD1_OWNER) {
326                 READ_BUF(4);
327                 len += 4;
328                 READ32(dummy32);
329                 READ_BUF(dummy32);
330                 len += (XDR_QUADLEN(dummy32) << 2);
331                 READMEM(buf, dummy32);
332                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
333                         return status;
334                 iattr->ia_valid |= ATTR_UID;
335         }
336         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
337                 READ_BUF(4);
338                 len += 4;
339                 READ32(dummy32);
340                 READ_BUF(dummy32);
341                 len += (XDR_QUADLEN(dummy32) << 2);
342                 READMEM(buf, dummy32);
343                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
344                         return status;
345                 iattr->ia_valid |= ATTR_GID;
346         }
347         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
348                 READ_BUF(4);
349                 len += 4;
350                 READ32(dummy32);
351                 switch (dummy32) {
352                 case NFS4_SET_TO_CLIENT_TIME:
353                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
354                            all 32 bits of 'nseconds'. */
355                         READ_BUF(12);
356                         len += 12;
357                         READ64(iattr->ia_atime.tv_sec);
358                         READ32(iattr->ia_atime.tv_nsec);
359                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
360                                 return nfserr_inval;
361                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
362                         break;
363                 case NFS4_SET_TO_SERVER_TIME:
364                         iattr->ia_valid |= ATTR_ATIME;
365                         break;
366                 default:
367                         goto xdr_error;
368                 }
369         }
370         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
371                 READ_BUF(4);
372                 len += 4;
373                 READ32(dummy32);
374                 switch (dummy32) {
375                 case NFS4_SET_TO_CLIENT_TIME:
376                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
377                            all 32 bits of 'nseconds'. */
378                         READ_BUF(12);
379                         len += 12;
380                         READ64(iattr->ia_mtime.tv_sec);
381                         READ32(iattr->ia_mtime.tv_nsec);
382                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
383                                 return nfserr_inval;
384                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
385                         break;
386                 case NFS4_SET_TO_SERVER_TIME:
387                         iattr->ia_valid |= ATTR_MTIME;
388                         break;
389                 default:
390                         goto xdr_error;
391                 }
392         }
393 
394         label->len = 0;
395 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
396         if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
397                 READ_BUF(4);
398                 len += 4;
399                 READ32(dummy32); /* lfs: we don't use it */
400                 READ_BUF(4);
401                 len += 4;
402                 READ32(dummy32); /* pi: we don't use it either */
403                 READ_BUF(4);
404                 len += 4;
405                 READ32(dummy32);
406                 READ_BUF(dummy32);
407                 if (dummy32 > NFSD4_MAX_SEC_LABEL_LEN)
408                         return nfserr_badlabel;
409                 len += (XDR_QUADLEN(dummy32) << 2);
410                 READMEM(buf, dummy32);
411                 label->data = kzalloc(dummy32 + 1, GFP_KERNEL);
412                 if (!label->data)
413                         return nfserr_jukebox;
414                 label->len = dummy32;
415                 defer_free(argp, kfree, label->data);
416                 memcpy(label->data, buf, dummy32);
417         }
418 #endif
419 
420         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
421             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
422             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
423                 READ_BUF(expected_len - len);
424         else if (len != expected_len)
425                 goto xdr_error;
426 
427         DECODE_TAIL;
428 
429 out_nfserr:
430         status = nfserrno(host_err);
431         goto out;
432 }
433 
434 static __be32
435 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
436 {
437         DECODE_HEAD;
438 
439         READ_BUF(sizeof(stateid_t));
440         READ32(sid->si_generation);
441         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
442 
443         DECODE_TAIL;
444 }
445 
446 static __be32
447 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
448 {
449         DECODE_HEAD;
450 
451         READ_BUF(4);
452         READ32(access->ac_req_access);
453 
454         DECODE_TAIL;
455 }
456 
457 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
458 {
459         DECODE_HEAD;
460         u32 dummy, uid, gid;
461         char *machine_name;
462         int i;
463         int nr_secflavs;
464 
465         /* callback_sec_params4 */
466         READ_BUF(4);
467         READ32(nr_secflavs);
468         if (nr_secflavs)
469                 cbs->flavor = (u32)(-1);
470         else
471                 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
472                 cbs->flavor = 0;
473         for (i = 0; i < nr_secflavs; ++i) {
474                 READ_BUF(4);
475                 READ32(dummy);
476                 switch (dummy) {
477                 case RPC_AUTH_NULL:
478                         /* Nothing to read */
479                         if (cbs->flavor == (u32)(-1))
480                                 cbs->flavor = RPC_AUTH_NULL;
481                         break;
482                 case RPC_AUTH_UNIX:
483                         READ_BUF(8);
484                         /* stamp */
485                         READ32(dummy);
486 
487                         /* machine name */
488                         READ32(dummy);
489                         READ_BUF(dummy);
490                         SAVEMEM(machine_name, dummy);
491 
492                         /* uid, gid */
493                         READ_BUF(8);
494                         READ32(uid);
495                         READ32(gid);
496 
497                         /* more gids */
498                         READ_BUF(4);
499                         READ32(dummy);
500                         READ_BUF(dummy * 4);
501                         if (cbs->flavor == (u32)(-1)) {
502                                 kuid_t kuid = make_kuid(&init_user_ns, uid);
503                                 kgid_t kgid = make_kgid(&init_user_ns, gid);
504                                 if (uid_valid(kuid) && gid_valid(kgid)) {
505                                         cbs->uid = kuid;
506                                         cbs->gid = kgid;
507                                         cbs->flavor = RPC_AUTH_UNIX;
508                                 } else {
509                                         dprintk("RPC_AUTH_UNIX with invalid"
510                                                 "uid or gid ignoring!\n");
511                                 }
512                         }
513                         break;
514                 case RPC_AUTH_GSS:
515                         dprintk("RPC_AUTH_GSS callback secflavor "
516                                 "not supported!\n");
517                         READ_BUF(8);
518                         /* gcbp_service */
519                         READ32(dummy);
520                         /* gcbp_handle_from_server */
521                         READ32(dummy);
522                         READ_BUF(dummy);
523                         p += XDR_QUADLEN(dummy);
524                         /* gcbp_handle_from_client */
525                         READ_BUF(4);
526                         READ32(dummy);
527                         READ_BUF(dummy);
528                         break;
529                 default:
530                         dprintk("Illegal callback secflavor\n");
531                         return nfserr_inval;
532                 }
533         }
534         DECODE_TAIL;
535 }
536 
537 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
538 {
539         DECODE_HEAD;
540 
541         READ_BUF(4);
542         READ32(bc->bc_cb_program);
543         nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
544 
545         DECODE_TAIL;
546 }
547 
548 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
549 {
550         DECODE_HEAD;
551 
552         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
553         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
554         READ32(bcts->dir);
555         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
556          * could help us figure out we should be using it. */
557         DECODE_TAIL;
558 }
559 
560 static __be32
561 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
562 {
563         DECODE_HEAD;
564 
565         READ_BUF(4);
566         READ32(close->cl_seqid);
567         return nfsd4_decode_stateid(argp, &close->cl_stateid);
568 
569         DECODE_TAIL;
570 }
571 
572 
573 static __be32
574 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
575 {
576         DECODE_HEAD;
577 
578         READ_BUF(12);
579         READ64(commit->co_offset);
580         READ32(commit->co_count);
581 
582         DECODE_TAIL;
583 }
584 
585 static __be32
586 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
587 {
588         DECODE_HEAD;
589 
590         READ_BUF(4);
591         READ32(create->cr_type);
592         switch (create->cr_type) {
593         case NF4LNK:
594                 READ_BUF(4);
595                 READ32(create->cr_linklen);
596                 READ_BUF(create->cr_linklen);
597                 SAVEMEM(create->cr_linkname, create->cr_linklen);
598                 break;
599         case NF4BLK:
600         case NF4CHR:
601                 READ_BUF(8);
602                 READ32(create->cr_specdata1);
603                 READ32(create->cr_specdata2);
604                 break;
605         case NF4SOCK:
606         case NF4FIFO:
607         case NF4DIR:
608         default:
609                 break;
610         }
611 
612         READ_BUF(4);
613         READ32(create->cr_namelen);
614         READ_BUF(create->cr_namelen);
615         SAVEMEM(create->cr_name, create->cr_namelen);
616         if ((status = check_filename(create->cr_name, create->cr_namelen)))
617                 return status;
618 
619         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
620                                     &create->cr_acl, &create->cr_label);
621         if (status)
622                 goto out;
623 
624         DECODE_TAIL;
625 }
626 
627 static inline __be32
628 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
629 {
630         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
631 }
632 
633 static inline __be32
634 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
635 {
636         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
637 }
638 
639 static __be32
640 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
641 {
642         DECODE_HEAD;
643 
644         READ_BUF(4);
645         READ32(link->li_namelen);
646         READ_BUF(link->li_namelen);
647         SAVEMEM(link->li_name, link->li_namelen);
648         if ((status = check_filename(link->li_name, link->li_namelen)))
649                 return status;
650 
651         DECODE_TAIL;
652 }
653 
654 static __be32
655 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
656 {
657         DECODE_HEAD;
658 
659         /*
660         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
661         */
662         READ_BUF(28);
663         READ32(lock->lk_type);
664         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
665                 goto xdr_error;
666         READ32(lock->lk_reclaim);
667         READ64(lock->lk_offset);
668         READ64(lock->lk_length);
669         READ32(lock->lk_is_new);
670 
671         if (lock->lk_is_new) {
672                 READ_BUF(4);
673                 READ32(lock->lk_new_open_seqid);
674                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
675                 if (status)
676                         return status;
677                 READ_BUF(8 + sizeof(clientid_t));
678                 READ32(lock->lk_new_lock_seqid);
679                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
680                 READ32(lock->lk_new_owner.len);
681                 READ_BUF(lock->lk_new_owner.len);
682                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
683         } else {
684                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
685                 if (status)
686                         return status;
687                 READ_BUF(4);
688                 READ32(lock->lk_old_lock_seqid);
689         }
690 
691         DECODE_TAIL;
692 }
693 
694 static __be32
695 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
696 {
697         DECODE_HEAD;
698                         
699         READ_BUF(32);
700         READ32(lockt->lt_type);
701         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
702                 goto xdr_error;
703         READ64(lockt->lt_offset);
704         READ64(lockt->lt_length);
705         COPYMEM(&lockt->lt_clientid, 8);
706         READ32(lockt->lt_owner.len);
707         READ_BUF(lockt->lt_owner.len);
708         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
709 
710         DECODE_TAIL;
711 }
712 
713 static __be32
714 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
715 {
716         DECODE_HEAD;
717 
718         READ_BUF(8);
719         READ32(locku->lu_type);
720         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
721                 goto xdr_error;
722         READ32(locku->lu_seqid);
723         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
724         if (status)
725                 return status;
726         READ_BUF(16);
727         READ64(locku->lu_offset);
728         READ64(locku->lu_length);
729 
730         DECODE_TAIL;
731 }
732 
733 static __be32
734 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
735 {
736         DECODE_HEAD;
737 
738         READ_BUF(4);
739         READ32(lookup->lo_len);
740         READ_BUF(lookup->lo_len);
741         SAVEMEM(lookup->lo_name, lookup->lo_len);
742         if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
743                 return status;
744 
745         DECODE_TAIL;
746 }
747 
748 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
749 {
750         __be32 *p;
751         u32 w;
752 
753         READ_BUF(4);
754         READ32(w);
755         *share_access = w & NFS4_SHARE_ACCESS_MASK;
756         *deleg_want = w & NFS4_SHARE_WANT_MASK;
757         if (deleg_when)
758                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
759 
760         switch (w & NFS4_SHARE_ACCESS_MASK) {
761         case NFS4_SHARE_ACCESS_READ:
762         case NFS4_SHARE_ACCESS_WRITE:
763         case NFS4_SHARE_ACCESS_BOTH:
764                 break;
765         default:
766                 return nfserr_bad_xdr;
767         }
768         w &= ~NFS4_SHARE_ACCESS_MASK;
769         if (!w)
770                 return nfs_ok;
771         if (!argp->minorversion)
772                 return nfserr_bad_xdr;
773         switch (w & NFS4_SHARE_WANT_MASK) {
774         case NFS4_SHARE_WANT_NO_PREFERENCE:
775         case NFS4_SHARE_WANT_READ_DELEG:
776         case NFS4_SHARE_WANT_WRITE_DELEG:
777         case NFS4_SHARE_WANT_ANY_DELEG:
778         case NFS4_SHARE_WANT_NO_DELEG:
779         case NFS4_SHARE_WANT_CANCEL:
780                 break;
781         default:
782                 return nfserr_bad_xdr;
783         }
784         w &= ~NFS4_SHARE_WANT_MASK;
785         if (!w)
786                 return nfs_ok;
787 
788         if (!deleg_when)        /* open_downgrade */
789                 return nfserr_inval;
790         switch (w) {
791         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
792         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
793         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
794               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
795                 return nfs_ok;
796         }
797 xdr_error:
798         return nfserr_bad_xdr;
799 }
800 
801 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
802 {
803         __be32 *p;
804 
805         READ_BUF(4);
806         READ32(*x);
807         /* Note: unlinke access bits, deny bits may be zero. */
808         if (*x & ~NFS4_SHARE_DENY_BOTH)
809                 return nfserr_bad_xdr;
810         return nfs_ok;
811 xdr_error:
812         return nfserr_bad_xdr;
813 }
814 
815 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
816 {
817         __be32 *p;
818 
819         READ_BUF(4);
820         READ32(o->len);
821 
822         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
823                 return nfserr_bad_xdr;
824 
825         READ_BUF(o->len);
826         SAVEMEM(o->data, o->len);
827         return nfs_ok;
828 xdr_error:
829         return nfserr_bad_xdr;
830 }
831 
832 static __be32
833 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
834 {
835         DECODE_HEAD;
836         u32 dummy;
837 
838         memset(open->op_bmval, 0, sizeof(open->op_bmval));
839         open->op_iattr.ia_valid = 0;
840         open->op_openowner = NULL;
841 
842         open->op_xdr_error = 0;
843         /* seqid, share_access, share_deny, clientid, ownerlen */
844         READ_BUF(4);
845         READ32(open->op_seqid);
846         /* decode, yet ignore deleg_when until supported */
847         status = nfsd4_decode_share_access(argp, &open->op_share_access,
848                                            &open->op_deleg_want, &dummy);
849         if (status)
850                 goto xdr_error;
851         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
852         if (status)
853                 goto xdr_error;
854         READ_BUF(sizeof(clientid_t));
855         COPYMEM(&open->op_clientid, sizeof(clientid_t));
856         status = nfsd4_decode_opaque(argp, &open->op_owner);
857         if (status)
858                 goto xdr_error;
859         READ_BUF(4);
860         READ32(open->op_create);
861         switch (open->op_create) {
862         case NFS4_OPEN_NOCREATE:
863                 break;
864         case NFS4_OPEN_CREATE:
865                 READ_BUF(4);
866                 READ32(open->op_createmode);
867                 switch (open->op_createmode) {
868                 case NFS4_CREATE_UNCHECKED:
869                 case NFS4_CREATE_GUARDED:
870                         status = nfsd4_decode_fattr(argp, open->op_bmval,
871                                 &open->op_iattr, &open->op_acl, &open->op_label);
872                         if (status)
873                                 goto out;
874                         break;
875                 case NFS4_CREATE_EXCLUSIVE:
876                         READ_BUF(NFS4_VERIFIER_SIZE);
877                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
878                         break;
879                 case NFS4_CREATE_EXCLUSIVE4_1:
880                         if (argp->minorversion < 1)
881                                 goto xdr_error;
882                         READ_BUF(NFS4_VERIFIER_SIZE);
883                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
884                         status = nfsd4_decode_fattr(argp, open->op_bmval,
885                                 &open->op_iattr, &open->op_acl, &open->op_label);
886                         if (status)
887                                 goto out;
888                         break;
889                 default:
890                         goto xdr_error;
891                 }
892                 break;
893         default:
894                 goto xdr_error;
895         }
896 
897         /* open_claim */
898         READ_BUF(4);
899         READ32(open->op_claim_type);
900         switch (open->op_claim_type) {
901         case NFS4_OPEN_CLAIM_NULL:
902         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
903                 READ_BUF(4);
904                 READ32(open->op_fname.len);
905                 READ_BUF(open->op_fname.len);
906                 SAVEMEM(open->op_fname.data, open->op_fname.len);
907                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
908                         return status;
909                 break;
910         case NFS4_OPEN_CLAIM_PREVIOUS:
911                 READ_BUF(4);
912                 READ32(open->op_delegate_type);
913                 break;
914         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
915                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
916                 if (status)
917                         return status;
918                 READ_BUF(4);
919                 READ32(open->op_fname.len);
920                 READ_BUF(open->op_fname.len);
921                 SAVEMEM(open->op_fname.data, open->op_fname.len);
922                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
923                         return status;
924                 break;
925         case NFS4_OPEN_CLAIM_FH:
926         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
927                 if (argp->minorversion < 1)
928                         goto xdr_error;
929                 /* void */
930                 break;
931         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
932                 if (argp->minorversion < 1)
933                         goto xdr_error;
934                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
935                 if (status)
936                         return status;
937                 break;
938         default:
939                 goto xdr_error;
940         }
941 
942         DECODE_TAIL;
943 }
944 
945 static __be32
946 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
947 {
948         DECODE_HEAD;
949 
950         if (argp->minorversion >= 1)
951                 return nfserr_notsupp;
952 
953         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
954         if (status)
955                 return status;
956         READ_BUF(4);
957         READ32(open_conf->oc_seqid);
958 
959         DECODE_TAIL;
960 }
961 
962 static __be32
963 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
964 {
965         DECODE_HEAD;
966                     
967         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
968         if (status)
969                 return status;
970         READ_BUF(4);
971         READ32(open_down->od_seqid);
972         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
973                                            &open_down->od_deleg_want, NULL);
974         if (status)
975                 return status;
976         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
977         if (status)
978                 return status;
979         DECODE_TAIL;
980 }
981 
982 static __be32
983 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
984 {
985         DECODE_HEAD;
986 
987         READ_BUF(4);
988         READ32(putfh->pf_fhlen);
989         if (putfh->pf_fhlen > NFS4_FHSIZE)
990                 goto xdr_error;
991         READ_BUF(putfh->pf_fhlen);
992         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
993 
994         DECODE_TAIL;
995 }
996 
997 static __be32
998 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
999 {
1000         if (argp->minorversion == 0)
1001                 return nfs_ok;
1002         return nfserr_notsupp;
1003 }
1004 
1005 static __be32
1006 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1007 {
1008         DECODE_HEAD;
1009 
1010         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1011         if (status)
1012                 return status;
1013         READ_BUF(12);
1014         READ64(read->rd_offset);
1015         READ32(read->rd_length);
1016 
1017         DECODE_TAIL;
1018 }
1019 
1020 static __be32
1021 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1022 {
1023         DECODE_HEAD;
1024 
1025         READ_BUF(24);
1026         READ64(readdir->rd_cookie);
1027         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1028         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
1029         READ32(readdir->rd_maxcount);
1030         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1031                 goto out;
1032 
1033         DECODE_TAIL;
1034 }
1035 
1036 static __be32
1037 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1038 {
1039         DECODE_HEAD;
1040 
1041         READ_BUF(4);
1042         READ32(remove->rm_namelen);
1043         READ_BUF(remove->rm_namelen);
1044         SAVEMEM(remove->rm_name, remove->rm_namelen);
1045         if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1046                 return status;
1047 
1048         DECODE_TAIL;
1049 }
1050 
1051 static __be32
1052 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1053 {
1054         DECODE_HEAD;
1055 
1056         READ_BUF(4);
1057         READ32(rename->rn_snamelen);
1058         READ_BUF(rename->rn_snamelen + 4);
1059         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1060         READ32(rename->rn_tnamelen);
1061         READ_BUF(rename->rn_tnamelen);
1062         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1063         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1064                 return status;
1065         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1066                 return status;
1067 
1068         DECODE_TAIL;
1069 }
1070 
1071 static __be32
1072 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1073 {
1074         DECODE_HEAD;
1075 
1076         if (argp->minorversion >= 1)
1077                 return nfserr_notsupp;
1078 
1079         READ_BUF(sizeof(clientid_t));
1080         COPYMEM(clientid, sizeof(clientid_t));
1081 
1082         DECODE_TAIL;
1083 }
1084 
1085 static __be32
1086 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1087                      struct nfsd4_secinfo *secinfo)
1088 {
1089         DECODE_HEAD;
1090 
1091         READ_BUF(4);
1092         READ32(secinfo->si_namelen);
1093         READ_BUF(secinfo->si_namelen);
1094         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1095         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1096         if (status)
1097                 return status;
1098         DECODE_TAIL;
1099 }
1100 
1101 static __be32
1102 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1103                      struct nfsd4_secinfo_no_name *sin)
1104 {
1105         DECODE_HEAD;
1106 
1107         READ_BUF(4);
1108         READ32(sin->sin_style);
1109         DECODE_TAIL;
1110 }
1111 
1112 static __be32
1113 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1114 {
1115         __be32 status;
1116 
1117         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1118         if (status)
1119                 return status;
1120         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1121                                   &setattr->sa_acl, &setattr->sa_label);
1122 }
1123 
1124 static __be32
1125 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1126 {
1127         DECODE_HEAD;
1128 
1129         if (argp->minorversion >= 1)
1130                 return nfserr_notsupp;
1131 
1132         READ_BUF(NFS4_VERIFIER_SIZE);
1133         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1134 
1135         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1136         if (status)
1137                 return nfserr_bad_xdr;
1138         READ_BUF(8);
1139         READ32(setclientid->se_callback_prog);
1140         READ32(setclientid->se_callback_netid_len);
1141 
1142         READ_BUF(setclientid->se_callback_netid_len + 4);
1143         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1144         READ32(setclientid->se_callback_addr_len);
1145 
1146         READ_BUF(setclientid->se_callback_addr_len + 4);
1147         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1148         READ32(setclientid->se_callback_ident);
1149 
1150         DECODE_TAIL;
1151 }
1152 
1153 static __be32
1154 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1155 {
1156         DECODE_HEAD;
1157 
1158         if (argp->minorversion >= 1)
1159                 return nfserr_notsupp;
1160 
1161         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1162         COPYMEM(&scd_c->sc_clientid, 8);
1163         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1164 
1165         DECODE_TAIL;
1166 }
1167 
1168 /* Also used for NVERIFY */
1169 static __be32
1170 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1171 {
1172         DECODE_HEAD;
1173 
1174         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1175                 goto out;
1176 
1177         /* For convenience's sake, we compare raw xdr'd attributes in
1178          * nfsd4_proc_verify */
1179 
1180         READ_BUF(4);
1181         READ32(verify->ve_attrlen);
1182         READ_BUF(verify->ve_attrlen);
1183         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1184 
1185         DECODE_TAIL;
1186 }
1187 
1188 static __be32
1189 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1190 {
1191         int avail;
1192         int len;
1193         DECODE_HEAD;
1194 
1195         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1196         if (status)
1197                 return status;
1198         READ_BUF(16);
1199         READ64(write->wr_offset);
1200         READ32(write->wr_stable_how);
1201         if (write->wr_stable_how > 2)
1202                 goto xdr_error;
1203         READ32(write->wr_buflen);
1204 
1205         /* Sorry .. no magic macros for this.. *
1206          * READ_BUF(write->wr_buflen);
1207          * SAVEMEM(write->wr_buf, write->wr_buflen);
1208          */
1209         avail = (char*)argp->end - (char*)argp->p;
1210         if (avail + argp->pagelen < write->wr_buflen) {
1211                 dprintk("NFSD: xdr error (%s:%d)\n",
1212                                 __FILE__, __LINE__);
1213                 goto xdr_error;
1214         }
1215         write->wr_head.iov_base = p;
1216         write->wr_head.iov_len = avail;
1217         WARN_ON(avail != (XDR_QUADLEN(avail) << 2));
1218         write->wr_pagelist = argp->pagelist;
1219 
1220         len = XDR_QUADLEN(write->wr_buflen) << 2;
1221         if (len >= avail) {
1222                 int pages;
1223 
1224                 len -= avail;
1225 
1226                 pages = len >> PAGE_SHIFT;
1227                 argp->pagelist += pages;
1228                 argp->pagelen -= pages * PAGE_SIZE;
1229                 len -= pages * PAGE_SIZE;
1230 
1231                 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1232                 argp->pagelist++;
1233                 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1234         }
1235         argp->p += XDR_QUADLEN(len);
1236 
1237         DECODE_TAIL;
1238 }
1239 
1240 static __be32
1241 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1242 {
1243         DECODE_HEAD;
1244 
1245         if (argp->minorversion >= 1)
1246                 return nfserr_notsupp;
1247 
1248         READ_BUF(12);
1249         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1250         READ32(rlockowner->rl_owner.len);
1251         READ_BUF(rlockowner->rl_owner.len);
1252         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1253 
1254         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1255                 return nfserr_inval;
1256         DECODE_TAIL;
1257 }
1258 
1259 static __be32
1260 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1261                          struct nfsd4_exchange_id *exid)
1262 {
1263         int dummy, tmp;
1264         DECODE_HEAD;
1265 
1266         READ_BUF(NFS4_VERIFIER_SIZE);
1267         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1268 
1269         status = nfsd4_decode_opaque(argp, &exid->clname);
1270         if (status)
1271                 return nfserr_bad_xdr;
1272 
1273         READ_BUF(4);
1274         READ32(exid->flags);
1275 
1276         /* Ignore state_protect4_a */
1277         READ_BUF(4);
1278         READ32(exid->spa_how);
1279         switch (exid->spa_how) {
1280         case SP4_NONE:
1281                 break;
1282         case SP4_MACH_CRED:
1283                 /* spo_must_enforce */
1284                 READ_BUF(4);
1285                 READ32(dummy);
1286                 READ_BUF(dummy * 4);
1287                 p += dummy;
1288 
1289                 /* spo_must_allow */
1290                 READ_BUF(4);
1291                 READ32(dummy);
1292                 READ_BUF(dummy * 4);
1293                 p += dummy;
1294                 break;
1295         case SP4_SSV:
1296                 /* ssp_ops */
1297                 READ_BUF(4);
1298                 READ32(dummy);
1299                 READ_BUF(dummy * 4);
1300                 p += dummy;
1301 
1302                 READ_BUF(4);
1303                 READ32(dummy);
1304                 READ_BUF(dummy * 4);
1305                 p += dummy;
1306 
1307                 /* ssp_hash_algs<> */
1308                 READ_BUF(4);
1309                 READ32(tmp);
1310                 while (tmp--) {
1311                         READ_BUF(4);
1312                         READ32(dummy);
1313                         READ_BUF(dummy);
1314                         p += XDR_QUADLEN(dummy);
1315                 }
1316 
1317                 /* ssp_encr_algs<> */
1318                 READ_BUF(4);
1319                 READ32(tmp);
1320                 while (tmp--) {
1321                         READ_BUF(4);
1322                         READ32(dummy);
1323                         READ_BUF(dummy);
1324                         p += XDR_QUADLEN(dummy);
1325                 }
1326 
1327                 /* ssp_window and ssp_num_gss_handles */
1328                 READ_BUF(8);
1329                 READ32(dummy);
1330                 READ32(dummy);
1331                 break;
1332         default:
1333                 goto xdr_error;
1334         }
1335 
1336         /* Ignore Implementation ID */
1337         READ_BUF(4);    /* nfs_impl_id4 array length */
1338         READ32(dummy);
1339 
1340         if (dummy > 1)
1341                 goto xdr_error;
1342 
1343         if (dummy == 1) {
1344                 /* nii_domain */
1345                 READ_BUF(4);
1346                 READ32(dummy);
1347                 READ_BUF(dummy);
1348                 p += XDR_QUADLEN(dummy);
1349 
1350                 /* nii_name */
1351                 READ_BUF(4);
1352                 READ32(dummy);
1353                 READ_BUF(dummy);
1354                 p += XDR_QUADLEN(dummy);
1355 
1356                 /* nii_date */
1357                 READ_BUF(12);
1358                 p += 3;
1359         }
1360         DECODE_TAIL;
1361 }
1362 
1363 static __be32
1364 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1365                             struct nfsd4_create_session *sess)
1366 {
1367         DECODE_HEAD;
1368         u32 dummy;
1369 
1370         READ_BUF(16);
1371         COPYMEM(&sess->clientid, 8);
1372         READ32(sess->seqid);
1373         READ32(sess->flags);
1374 
1375         /* Fore channel attrs */
1376         READ_BUF(28);
1377         READ32(dummy); /* headerpadsz is always 0 */
1378         READ32(sess->fore_channel.maxreq_sz);
1379         READ32(sess->fore_channel.maxresp_sz);
1380         READ32(sess->fore_channel.maxresp_cached);
1381         READ32(sess->fore_channel.maxops);
1382         READ32(sess->fore_channel.maxreqs);
1383         READ32(sess->fore_channel.nr_rdma_attrs);
1384         if (sess->fore_channel.nr_rdma_attrs == 1) {
1385                 READ_BUF(4);
1386                 READ32(sess->fore_channel.rdma_attrs);
1387         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1388                 dprintk("Too many fore channel attr bitmaps!\n");
1389                 goto xdr_error;
1390         }
1391 
1392         /* Back channel attrs */
1393         READ_BUF(28);
1394         READ32(dummy); /* headerpadsz is always 0 */
1395         READ32(sess->back_channel.maxreq_sz);
1396         READ32(sess->back_channel.maxresp_sz);
1397         READ32(sess->back_channel.maxresp_cached);
1398         READ32(sess->back_channel.maxops);
1399         READ32(sess->back_channel.maxreqs);
1400         READ32(sess->back_channel.nr_rdma_attrs);
1401         if (sess->back_channel.nr_rdma_attrs == 1) {
1402                 READ_BUF(4);
1403                 READ32(sess->back_channel.rdma_attrs);
1404         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1405                 dprintk("Too many back channel attr bitmaps!\n");
1406                 goto xdr_error;
1407         }
1408 
1409         READ_BUF(4);
1410         READ32(sess->callback_prog);
1411         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1412         DECODE_TAIL;
1413 }
1414 
1415 static __be32
1416 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1417                              struct nfsd4_destroy_session *destroy_session)
1418 {
1419         DECODE_HEAD;
1420         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1421         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1422 
1423         DECODE_TAIL;
1424 }
1425 
1426 static __be32
1427 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1428                           struct nfsd4_free_stateid *free_stateid)
1429 {
1430         DECODE_HEAD;
1431 
1432         READ_BUF(sizeof(stateid_t));
1433         READ32(free_stateid->fr_stateid.si_generation);
1434         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1435 
1436         DECODE_TAIL;
1437 }
1438 
1439 static __be32
1440 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1441                       struct nfsd4_sequence *seq)
1442 {
1443         DECODE_HEAD;
1444 
1445         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1446         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1447         READ32(seq->seqid);
1448         READ32(seq->slotid);
1449         READ32(seq->maxslots);
1450         READ32(seq->cachethis);
1451 
1452         DECODE_TAIL;
1453 }
1454 
1455 static __be32
1456 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1457 {
1458         int i;
1459         __be32 *p, status;
1460         struct nfsd4_test_stateid_id *stateid;
1461 
1462         READ_BUF(4);
1463         test_stateid->ts_num_ids = ntohl(*p++);
1464 
1465         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1466 
1467         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1468                 stateid = kmalloc(sizeof(struct nfsd4_test_stateid_id), GFP_KERNEL);
1469                 if (!stateid) {
1470                         status = nfserrno(-ENOMEM);
1471                         goto out;
1472                 }
1473 
1474                 defer_free(argp, kfree, stateid);
1475                 INIT_LIST_HEAD(&stateid->ts_id_list);
1476                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1477 
1478                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1479                 if (status)
1480                         goto out;
1481         }
1482 
1483         status = 0;
1484 out:
1485         return status;
1486 xdr_error:
1487         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1488         status = nfserr_bad_xdr;
1489         goto out;
1490 }
1491 
1492 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1493 {
1494         DECODE_HEAD;
1495 
1496         READ_BUF(8);
1497         COPYMEM(&dc->clientid, 8);
1498 
1499         DECODE_TAIL;
1500 }
1501 
1502 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1503 {
1504         DECODE_HEAD;
1505 
1506         READ_BUF(4);
1507         READ32(rc->rca_one_fs);
1508 
1509         DECODE_TAIL;
1510 }
1511 
1512 static __be32
1513 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1514 {
1515         return nfs_ok;
1516 }
1517 
1518 static __be32
1519 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1520 {
1521         return nfserr_notsupp;
1522 }
1523 
1524 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1525 
1526 static nfsd4_dec nfsd4_dec_ops[] = {
1527         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1528         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1529         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1530         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1531         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1532         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1533         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1534         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1535         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1536         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1537         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1538         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1539         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1540         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1541         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1542         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1543         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1544         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1545         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1546         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1547         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1548         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1549         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1550         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1551         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1552         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1553         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1554         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1555         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1556         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1557         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1558         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1559         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1560         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1561         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1562         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1563         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1564 
1565         /* new operations for NFSv4.1 */
1566         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1567         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1568         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1569         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1570         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1571         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1572         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1573         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1574         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1575         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1576         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1577         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1578         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1579         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1580         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1581         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1582         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1583         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1584         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1585 };
1586 
1587 static inline bool
1588 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1589 {
1590         if (op->opnum < FIRST_NFS4_OP)
1591                 return false;
1592         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1593                 return false;
1594         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1595                 return false;
1596         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1597                 return false;
1598         return true;
1599 }
1600 
1601 /*
1602  * Return a rough estimate of the maximum possible reply size.  Note the
1603  * estimate includes rpc headers so is meant to be passed to
1604  * svc_reserve, not svc_reserve_auth.
1605  *
1606  * Also note the current compound encoding permits only one operation to
1607  * use pages beyond the first one, so the maximum possible length is the
1608  * maximum over these values, not the sum.
1609  */
1610 static int nfsd4_max_reply(u32 opnum)
1611 {
1612         switch (opnum) {
1613         case OP_READLINK:
1614         case OP_READDIR:
1615                 /*
1616                  * Both of these ops take a single page for data and put
1617                  * the head and tail in another page:
1618                  */
1619                 return 2 * PAGE_SIZE;
1620         case OP_READ:
1621                 return INT_MAX;
1622         default:
1623                 return PAGE_SIZE;
1624         }
1625 }
1626 
1627 static __be32
1628 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1629 {
1630         DECODE_HEAD;
1631         struct nfsd4_op *op;
1632         bool cachethis = false;
1633         int max_reply = PAGE_SIZE;
1634         int i;
1635 
1636         READ_BUF(4);
1637         READ32(argp->taglen);
1638         READ_BUF(argp->taglen + 8);
1639         SAVEMEM(argp->tag, argp->taglen);
1640         READ32(argp->minorversion);
1641         READ32(argp->opcnt);
1642 
1643         if (argp->taglen > NFSD4_MAX_TAGLEN)
1644                 goto xdr_error;
1645         if (argp->opcnt > 100)
1646                 goto xdr_error;
1647 
1648         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1649                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1650                 if (!argp->ops) {
1651                         argp->ops = argp->iops;
1652                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1653                         goto xdr_error;
1654                 }
1655         }
1656 
1657         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1658                 argp->opcnt = 0;
1659 
1660         for (i = 0; i < argp->opcnt; i++) {
1661                 op = &argp->ops[i];
1662                 op->replay = NULL;
1663 
1664                 READ_BUF(4);
1665                 READ32(op->opnum);
1666 
1667                 if (nfsd4_opnum_in_range(argp, op))
1668                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1669                 else {
1670                         op->opnum = OP_ILLEGAL;
1671                         op->status = nfserr_op_illegal;
1672                 }
1673 
1674                 if (op->status) {
1675                         argp->opcnt = i+1;
1676                         break;
1677                 }
1678                 /*
1679                  * We'll try to cache the result in the DRC if any one
1680                  * op in the compound wants to be cached:
1681                  */
1682                 cachethis |= nfsd4_cache_this_op(op);
1683 
1684                 max_reply = max(max_reply, nfsd4_max_reply(op->opnum));
1685         }
1686         /* Sessions make the DRC unnecessary: */
1687         if (argp->minorversion)
1688                 cachethis = false;
1689         if (max_reply != INT_MAX)
1690                 svc_reserve(argp->rqstp, max_reply);
1691         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1692 
1693         DECODE_TAIL;
1694 }
1695 
1696 #define WRITE32(n)               *p++ = htonl(n)
1697 #define WRITE64(n)               do {                           \
1698         *p++ = htonl((u32)((n) >> 32));                         \
1699         *p++ = htonl((u32)(n));                                 \
1700 } while (0)
1701 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1702         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1703         memcpy(p, ptr, nbytes);                                 \
1704         p += XDR_QUADLEN(nbytes);                               \
1705 }} while (0)
1706 
1707 static void write32(__be32 **p, u32 n)
1708 {
1709         *(*p)++ = htonl(n);
1710 }
1711 
1712 static void write64(__be32 **p, u64 n)
1713 {
1714         write32(p, (n >> 32));
1715         write32(p, (u32)n);
1716 }
1717 
1718 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1719 {
1720         if (IS_I_VERSION(inode)) {
1721                 write64(p, inode->i_version);
1722         } else {
1723                 write32(p, stat->ctime.tv_sec);
1724                 write32(p, stat->ctime.tv_nsec);
1725         }
1726 }
1727 
1728 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1729 {
1730         write32(p, c->atomic);
1731         if (c->change_supported) {
1732                 write64(p, c->before_change);
1733                 write64(p, c->after_change);
1734         } else {
1735                 write32(p, c->before_ctime_sec);
1736                 write32(p, c->before_ctime_nsec);
1737                 write32(p, c->after_ctime_sec);
1738                 write32(p, c->after_ctime_nsec);
1739         }
1740 }
1741 
1742 #define RESERVE_SPACE(nbytes)   do {                            \
1743         p = resp->p;                                            \
1744         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1745 } while (0)
1746 #define ADJUST_ARGS()           resp->p = p
1747 
1748 /* Encode as an array of strings the string given with components
1749  * separated @sep, escaped with esc_enter and esc_exit.
1750  */
1751 static __be32 nfsd4_encode_components_esc(char sep, char *components,
1752                                    __be32 **pp, int *buflen,
1753                                    char esc_enter, char esc_exit)
1754 {
1755         __be32 *p = *pp;
1756         __be32 *countp = p;
1757         int strlen, count=0;
1758         char *str, *end, *next;
1759 
1760         dprintk("nfsd4_encode_components(%s)\n", components);
1761         if ((*buflen -= 4) < 0)
1762                 return nfserr_resource;
1763         WRITE32(0); /* We will fill this in with @count later */
1764         end = str = components;
1765         while (*end) {
1766                 bool found_esc = false;
1767 
1768                 /* try to parse as esc_start, ..., esc_end, sep */
1769                 if (*str == esc_enter) {
1770                         for (; *end && (*end != esc_exit); end++)
1771                                 /* find esc_exit or end of string */;
1772                         next = end + 1;
1773                         if (*end && (!*next || *next == sep)) {
1774                                 str++;
1775                                 found_esc = true;
1776                         }
1777                 }
1778 
1779                 if (!found_esc)
1780                         for (; *end && (*end != sep); end++)
1781                                 /* find sep or end of string */;
1782 
1783                 strlen = end - str;
1784                 if (strlen) {
1785                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1786                                 return nfserr_resource;
1787                         WRITE32(strlen);
1788                         WRITEMEM(str, strlen);
1789                         count++;
1790                 }
1791                 else
1792                         end++;
1793                 str = end;
1794         }
1795         *pp = p;
1796         p = countp;
1797         WRITE32(count);
1798         return 0;
1799 }
1800 
1801 /* Encode as an array of strings the string given with components
1802  * separated @sep.
1803  */
1804 static __be32 nfsd4_encode_components(char sep, char *components,
1805                                    __be32 **pp, int *buflen)
1806 {
1807         return nfsd4_encode_components_esc(sep, components, pp, buflen, 0, 0);
1808 }
1809 
1810 /*
1811  * encode a location element of a fs_locations structure
1812  */
1813 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1814                                     __be32 **pp, int *buflen)
1815 {
1816         __be32 status;
1817         __be32 *p = *pp;
1818 
1819         status = nfsd4_encode_components_esc(':', location->hosts, &p, buflen,
1820                                                 '[', ']');
1821         if (status)
1822                 return status;
1823         status = nfsd4_encode_components('/', location->path, &p, buflen);
1824         if (status)
1825                 return status;
1826         *pp = p;
1827         return 0;
1828 }
1829 
1830 /*
1831  * Encode a path in RFC3530 'pathname4' format
1832  */
1833 static __be32 nfsd4_encode_path(const struct path *root,
1834                 const struct path *path, __be32 **pp, int *buflen)
1835 {
1836         struct path cur = *path;
1837         __be32 *p = *pp;
1838         struct dentry **components = NULL;
1839         unsigned int ncomponents = 0;
1840         __be32 err = nfserr_jukebox;
1841 
1842         dprintk("nfsd4_encode_components(");
1843 
1844         path_get(&cur);
1845         /* First walk the path up to the nfsd root, and store the
1846          * dentries/path components in an array.
1847          */
1848         for (;;) {
1849                 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1850                         break;
1851                 if (cur.dentry == cur.mnt->mnt_root) {
1852                         if (follow_up(&cur))
1853                                 continue;
1854                         goto out_free;
1855                 }
1856                 if ((ncomponents & 15) == 0) {
1857                         struct dentry **new;
1858                         new = krealloc(components,
1859                                         sizeof(*new) * (ncomponents + 16),
1860                                         GFP_KERNEL);
1861                         if (!new)
1862                                 goto out_free;
1863                         components = new;
1864                 }
1865                 components[ncomponents++] = cur.dentry;
1866                 cur.dentry = dget_parent(cur.dentry);
1867         }
1868 
1869         *buflen -= 4;
1870         if (*buflen < 0)
1871                 goto out_free;
1872         WRITE32(ncomponents);
1873 
1874         while (ncomponents) {
1875                 struct dentry *dentry = components[ncomponents - 1];
1876                 unsigned int len;
1877 
1878                 spin_lock(&dentry->d_lock);
1879                 len = dentry->d_name.len;
1880                 *buflen -= 4 + (XDR_QUADLEN(len) << 2);
1881                 if (*buflen < 0) {
1882                         spin_unlock(&dentry->d_lock);
1883                         goto out_free;
1884                 }
1885                 WRITE32(len);
1886                 WRITEMEM(dentry->d_name.name, len);
1887                 dprintk("/%s", dentry->d_name.name);
1888                 spin_unlock(&dentry->d_lock);
1889                 dput(dentry);
1890                 ncomponents--;
1891         }
1892 
1893         *pp = p;
1894         err = 0;
1895 out_free:
1896         dprintk(")\n");
1897         while (ncomponents)
1898                 dput(components[--ncomponents]);
1899         kfree(components);
1900         path_put(&cur);
1901         return err;
1902 }
1903 
1904 static __be32 nfsd4_encode_fsloc_fsroot(struct svc_rqst *rqstp,
1905                 const struct path *path, __be32 **pp, int *buflen)
1906 {
1907         struct svc_export *exp_ps;
1908         __be32 res;
1909 
1910         exp_ps = rqst_find_fsidzero_export(rqstp);
1911         if (IS_ERR(exp_ps))
1912                 return nfserrno(PTR_ERR(exp_ps));
1913         res = nfsd4_encode_path(&exp_ps->ex_path, path, pp, buflen);
1914         exp_put(exp_ps);
1915         return res;
1916 }
1917 
1918 /*
1919  *  encode a fs_locations structure
1920  */
1921 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1922                                      struct svc_export *exp,
1923                                      __be32 **pp, int *buflen)
1924 {
1925         __be32 status;
1926         int i;
1927         __be32 *p = *pp;
1928         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1929 
1930         status = nfsd4_encode_fsloc_fsroot(rqstp, &exp->ex_path, &p, buflen);
1931         if (status)
1932                 return status;
1933         if ((*buflen -= 4) < 0)
1934                 return nfserr_resource;
1935         WRITE32(fslocs->locations_count);
1936         for (i=0; i<fslocs->locations_count; i++) {
1937                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1938                                                    &p, buflen);
1939                 if (status)
1940                         return status;
1941         }
1942         *pp = p;
1943         return 0;
1944 }
1945 
1946 static u32 nfs4_file_type(umode_t mode)
1947 {
1948         switch (mode & S_IFMT) {
1949         case S_IFIFO:   return NF4FIFO;
1950         case S_IFCHR:   return NF4CHR;
1951         case S_IFDIR:   return NF4DIR;
1952         case S_IFBLK:   return NF4BLK;
1953         case S_IFLNK:   return NF4LNK;
1954         case S_IFREG:   return NF4REG;
1955         case S_IFSOCK:  return NF4SOCK;
1956         default:        return NF4BAD;
1957         };
1958 }
1959 
1960 static __be32
1961 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, kuid_t uid, kgid_t gid,
1962                         __be32 **p, int *buflen)
1963 {
1964         int status;
1965 
1966         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1967                 return nfserr_resource;
1968         if (whotype != NFS4_ACL_WHO_NAMED)
1969                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1970         else if (gid_valid(gid))
1971                 status = nfsd_map_gid_to_name(rqstp, gid, (u8 *)(*p + 1));
1972         else
1973                 status = nfsd_map_uid_to_name(rqstp, uid, (u8 *)(*p + 1));
1974         if (status < 0)
1975                 return nfserrno(status);
1976         *p = xdr_encode_opaque(*p, NULL, status);
1977         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1978         BUG_ON(*buflen < 0);
1979         return 0;
1980 }
1981 
1982 static inline __be32
1983 nfsd4_encode_user(struct svc_rqst *rqstp, kuid_t user, __be32 **p, int *buflen)
1984 {
1985         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, user, INVALID_GID,
1986                                  p, buflen);
1987 }
1988 
1989 static inline __be32
1990 nfsd4_encode_group(struct svc_rqst *rqstp, kgid_t group, __be32 **p, int *buflen)
1991 {
1992         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, INVALID_UID, group,
1993                                  p, buflen);
1994 }
1995 
1996 static inline __be32
1997 nfsd4_encode_aclname(struct svc_rqst *rqstp, struct nfs4_ace *ace,
1998                 __be32 **p, int *buflen)
1999 {
2000         kuid_t uid = INVALID_UID;
2001         kgid_t gid = INVALID_GID;
2002 
2003         if (ace->whotype == NFS4_ACL_WHO_NAMED) {
2004                 if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2005                         gid = ace->who_gid;
2006                 else
2007                         uid = ace->who_uid;
2008         }
2009         return nfsd4_encode_name(rqstp, ace->whotype, uid, gid, p, buflen);
2010 }
2011 
2012 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2013                               FATTR4_WORD0_RDATTR_ERROR)
2014 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2015 
2016 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2017 static inline __be32
2018 nfsd4_encode_security_label(struct svc_rqst *rqstp, void *context, int len, __be32 **pp, int *buflen)
2019 {
2020         __be32 *p = *pp;
2021 
2022         if (*buflen < ((XDR_QUADLEN(len) << 2) + 4 + 4 + 4))
2023                 return nfserr_resource;
2024 
2025         /*
2026          * For now we use a 0 here to indicate the null translation; in
2027          * the future we may place a call to translation code here.
2028          */
2029         if ((*buflen -= 8) < 0)
2030                 return nfserr_resource;
2031 
2032         WRITE32(0); /* lfs */
2033         WRITE32(0); /* pi */
2034         p = xdr_encode_opaque(p, context, len);
2035         *buflen -= (XDR_QUADLEN(len) << 2) + 4;
2036 
2037         *pp = p;
2038         return 0;
2039 }
2040 #else
2041 static inline __be32
2042 nfsd4_encode_security_label(struct svc_rqst *rqstp, void *context, int len, __be32 **pp, int *buflen)
2043 { return 0; }
2044 #endif
2045 
2046 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
2047 {
2048         /* As per referral draft:  */
2049         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2050             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2051                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2052                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2053                         *rdattr_err = NFSERR_MOVED;
2054                 else
2055                         return nfserr_moved;
2056         }
2057         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2058         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2059         return 0;
2060 }
2061 
2062 
2063 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2064 {
2065         struct path path = exp->ex_path;
2066         int err;
2067 
2068         path_get(&path);
2069         while (follow_up(&path)) {
2070                 if (path.dentry != path.mnt->mnt_root)
2071                         break;
2072         }
2073         err = vfs_getattr(&path, stat);
2074         path_put(&path);
2075         return err;
2076 }
2077 
2078 /*
2079  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2080  * ourselves.
2081  *
2082  * countp is the buffer size in _words_
2083  */
2084 __be32
2085 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
2086                 struct dentry *dentry, __be32 **buffer, int count, u32 *bmval,
2087                 struct svc_rqst *rqstp, int ignore_crossmnt)
2088 {
2089         u32 bmval0 = bmval[0];
2090         u32 bmval1 = bmval[1];
2091         u32 bmval2 = bmval[2];
2092         struct kstat stat;
2093         struct svc_fh tempfh;
2094         struct kstatfs statfs;
2095         int buflen = count << 2;
2096         __be32 *attrlenp;
2097         u32 dummy;
2098         u64 dummy64;
2099         u32 rdattr_err = 0;
2100         __be32 *p = *buffer;
2101         __be32 status;
2102         int err;
2103         int aclsupport = 0;
2104         struct nfs4_acl *acl = NULL;
2105         void *context = NULL;
2106         int contextlen;
2107         bool contextsupport = false;
2108         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2109         u32 minorversion = resp->cstate.minorversion;
2110         struct path path = {
2111                 .mnt    = exp->ex_path.mnt,
2112                 .dentry = dentry,
2113         };
2114         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2115 
2116         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2117         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2118         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2119         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2120 
2121         if (exp->ex_fslocs.migrated) {
2122                 BUG_ON(bmval[2]);
2123                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2124                 if (status)
2125                         goto out;
2126         }
2127 
2128         err = vfs_getattr(&path, &stat);
2129         if (err)
2130                 goto out_nfserr;
2131         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
2132                         FATTR4_WORD0_MAXNAME)) ||
2133             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2134                        FATTR4_WORD1_SPACE_TOTAL))) {
2135                 err = vfs_statfs(&path, &statfs);
2136                 if (err)
2137                         goto out_nfserr;
2138         }
2139         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2140                 fh_init(&tempfh, NFS4_FHSIZE);
2141                 status = fh_compose(&tempfh, exp, dentry, NULL);
2142                 if (status)
2143                         goto out;
2144                 fhp = &tempfh;
2145         }
2146         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2147                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2148                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2149                 aclsupport = (err == 0);
2150                 if (bmval0 & FATTR4_WORD0_ACL) {
2151                         if (err == -EOPNOTSUPP)
2152                                 bmval0 &= ~FATTR4_WORD0_ACL;
2153                         else if (err == -EINVAL) {
2154                                 status = nfserr_attrnotsupp;
2155                                 goto out;
2156                         } else if (err != 0)
2157                                 goto out_nfserr;
2158                 }
2159         }
2160 
2161 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2162         if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) ||
2163                         bmval[0] & FATTR4_WORD0_SUPPORTED_ATTRS) {
2164                 err = security_inode_getsecctx(dentry->d_inode,
2165                                                 &context, &contextlen);
2166                 contextsupport = (err == 0);
2167                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2168                         if (err == -EOPNOTSUPP)
2169                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2170                         else if (err)
2171                                 goto out_nfserr;
2172                 }
2173         }
2174 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2175 
2176         if (bmval2) {
2177                 if ((buflen -= 16) < 0)
2178                         goto out_resource;
2179                 WRITE32(3);
2180                 WRITE32(bmval0);
2181                 WRITE32(bmval1);
2182                 WRITE32(bmval2);
2183         } else if (bmval1) {
2184                 if ((buflen -= 12) < 0)
2185                         goto out_resource;
2186                 WRITE32(2);
2187                 WRITE32(bmval0);
2188                 WRITE32(bmval1);
2189         } else {
2190                 if ((buflen -= 8) < 0)
2191                         goto out_resource;
2192                 WRITE32(1);
2193                 WRITE32(bmval0);
2194         }
2195         attrlenp = p++;                /* to be backfilled later */
2196 
2197         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2198                 u32 word0 = nfsd_suppattrs0(minorversion);
2199                 u32 word1 = nfsd_suppattrs1(minorversion);
2200                 u32 word2 = nfsd_suppattrs2(minorversion);
2201 
2202                 if (!aclsupport)
2203                         word0 &= ~FATTR4_WORD0_ACL;
2204                 if (!contextsupport)
2205                         word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2206                 if (!word2) {
2207                         if ((buflen -= 12) < 0)
2208                                 goto out_resource;
2209                         WRITE32(2);
2210                         WRITE32(word0);
2211                         WRITE32(word1);
2212                 } else {
2213                         if ((buflen -= 16) < 0)
2214                                 goto out_resource;
2215                         WRITE32(3);
2216                         WRITE32(word0);
2217                         WRITE32(word1);
2218                         WRITE32(word2);
2219                 }
2220         }
2221         if (bmval0 & FATTR4_WORD0_TYPE) {
2222                 if ((buflen -= 4) < 0)
2223                         goto out_resource;
2224                 dummy = nfs4_file_type(stat.mode);
2225                 if (dummy == NF4BAD)
2226                         goto out_serverfault;
2227                 WRITE32(dummy);
2228         }
2229         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2230                 if ((buflen -= 4) < 0)
2231                         goto out_resource;
2232                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2233                         WRITE32(NFS4_FH_PERSISTENT);
2234                 else
2235                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
2236         }
2237         if (bmval0 & FATTR4_WORD0_CHANGE) {
2238                 if ((buflen -= 8) < 0)
2239                         goto out_resource;
2240                 write_change(&p, &stat, dentry->d_inode);
2241         }
2242         if (bmval0 & FATTR4_WORD0_SIZE) {
2243                 if ((buflen -= 8) < 0)
2244                         goto out_resource;
2245                 WRITE64(stat.size);
2246         }
2247         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2248                 if ((buflen -= 4) < 0)
2249                         goto out_resource;
2250                 WRITE32(1);
2251         }
2252         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2253                 if ((buflen -= 4) < 0)
2254                         goto out_resource;
2255                 WRITE32(1);
2256         }
2257         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2258                 if ((buflen -= 4) < 0)
2259                         goto out_resource;
2260                 WRITE32(0);
2261         }
2262         if (bmval0 & FATTR4_WORD0_FSID) {
2263                 if ((buflen -= 16) < 0)
2264                         goto out_resource;
2265                 if (exp->ex_fslocs.migrated) {
2266                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
2267                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
2268                 } else switch(fsid_source(fhp)) {
2269                 case FSIDSOURCE_FSID:
2270                         WRITE64((u64)exp->ex_fsid);
2271                         WRITE64((u64)0);
2272                         break;
2273                 case FSIDSOURCE_DEV:
2274                         WRITE32(0);
2275                         WRITE32(MAJOR(stat.dev));
2276                         WRITE32(0);
2277                         WRITE32(MINOR(stat.dev));
2278                         break;
2279                 case FSIDSOURCE_UUID:
2280                         WRITEMEM(exp->ex_uuid, 16);
2281                         break;
2282                 }
2283         }
2284         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2285                 if ((buflen -= 4) < 0)
2286                         goto out_resource;
2287                 WRITE32(0);
2288         }
2289         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2290                 if ((buflen -= 4) < 0)
2291                         goto out_resource;
2292                 WRITE32(nn->nfsd4_lease);
2293         }
2294         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2295                 if ((buflen -= 4) < 0)
2296                         goto out_resource;
2297                 WRITE32(rdattr_err);
2298         }
2299         if (bmval0 & FATTR4_WORD0_ACL) {
2300                 struct nfs4_ace *ace;
2301 
2302                 if (acl == NULL) {
2303                         if ((buflen -= 4) < 0)
2304                                 goto out_resource;
2305 
2306                         WRITE32(0);
2307                         goto out_acl;
2308                 }
2309                 if ((buflen -= 4) < 0)
2310                         goto out_resource;
2311                 WRITE32(acl->naces);
2312 
2313                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2314                         if ((buflen -= 4*3) < 0)
2315                                 goto out_resource;
2316                         WRITE32(ace->type);
2317                         WRITE32(ace->flag);
2318                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
2319                         status = nfsd4_encode_aclname(rqstp, ace, &p, &buflen);
2320                         if (status == nfserr_resource)
2321                                 goto out_resource;
2322                         if (status)
2323                                 goto out;
2324                 }
2325         }
2326 out_acl:
2327         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2328                 if ((buflen -= 4) < 0)
2329                         goto out_resource;
2330                 WRITE32(aclsupport ?
2331                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2332         }
2333         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2334                 if ((buflen -= 4) < 0)
2335                         goto out_resource;
2336                 WRITE32(1);
2337         }
2338         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2339                 if ((buflen -= 4) < 0)
2340                         goto out_resource;
2341                 WRITE32(0);
2342         }
2343         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2344                 if ((buflen -= 4) < 0)
2345                         goto out_resource;
2346                 WRITE32(1);
2347         }
2348         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2349                 if ((buflen -= 4) < 0)
2350                         goto out_resource;
2351                 WRITE32(1);
2352         }
2353         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2354                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
2355                 if (buflen < 0)
2356                         goto out_resource;
2357                 WRITE32(fhp->fh_handle.fh_size);
2358                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2359         }
2360         if (bmval0 & FATTR4_WORD0_FILEID) {
2361                 if ((buflen -= 8) < 0)
2362                         goto out_resource;
2363                 WRITE64(stat.ino);
2364         }
2365         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2366                 if ((buflen -= 8) < 0)
2367                         goto out_resource;
2368                 WRITE64((u64) statfs.f_ffree);
2369         }
2370         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2371                 if ((buflen -= 8) < 0)
2372                         goto out_resource;
2373                 WRITE64((u64) statfs.f_ffree);
2374         }
2375         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2376                 if ((buflen -= 8) < 0)
2377                         goto out_resource;
2378                 WRITE64((u64) statfs.f_files);
2379         }
2380         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2381                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2382                 if (status == nfserr_resource)
2383                         goto out_resource;
2384                 if (status)
2385                         goto out;
2386         }
2387         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2388                 if ((buflen -= 4) < 0)
2389                         goto out_resource;
2390                 WRITE32(1);
2391         }
2392         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2393                 if ((buflen -= 8) < 0)
2394                         goto out_resource;
2395                 WRITE64(exp->ex_path.mnt->mnt_sb->s_maxbytes);
2396         }
2397         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2398                 if ((buflen -= 4) < 0)
2399                         goto out_resource;
2400                 WRITE32(255);
2401         }
2402         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2403                 if ((buflen -= 4) < 0)
2404                         goto out_resource;
2405                 WRITE32(statfs.f_namelen);
2406         }
2407         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2408                 if ((buflen -= 8) < 0)
2409                         goto out_resource;
2410                 WRITE64((u64) svc_max_payload(rqstp));
2411         }
2412         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2413                 if ((buflen -= 8) < 0)
2414                         goto out_resource;
2415                 WRITE64((u64) svc_max_payload(rqstp));
2416         }
2417         if (bmval1 & FATTR4_WORD1_MODE) {
2418                 if ((buflen -= 4) < 0)
2419                         goto out_resource;
2420                 WRITE32(stat.mode & S_IALLUGO);
2421         }
2422         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2423                 if ((buflen -= 4) < 0)
2424                         goto out_resource;
2425                 WRITE32(1);
2426         }
2427         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2428                 if ((buflen -= 4) < 0)
2429                         goto out_resource;
2430                 WRITE32(stat.nlink);
2431         }
2432         if (bmval1 & FATTR4_WORD1_OWNER) {
2433                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2434                 if (status == nfserr_resource)
2435                         goto out_resource;
2436                 if (status)
2437                         goto out;
2438         }
2439         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2440                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2441                 if (status == nfserr_resource)
2442                         goto out_resource;
2443                 if (status)
2444                         goto out;
2445         }
2446         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2447                 if ((buflen -= 8) < 0)
2448                         goto out_resource;
2449                 WRITE32((u32) MAJOR(stat.rdev));
2450                 WRITE32((u32) MINOR(stat.rdev));
2451         }
2452         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2453                 if ((buflen -= 8) < 0)
2454                         goto out_resource;
2455                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2456                 WRITE64(dummy64);
2457         }
2458         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2459                 if ((buflen -= 8) < 0)
2460                         goto out_resource;
2461                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2462                 WRITE64(dummy64);
2463         }
2464         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2465                 if ((buflen -= 8) < 0)
2466                         goto out_resource;
2467                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2468                 WRITE64(dummy64);
2469         }
2470         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2471                 if ((buflen -= 8) < 0)
2472                         goto out_resource;
2473                 dummy64 = (u64)stat.blocks << 9;
2474                 WRITE64(dummy64);
2475         }
2476         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2477                 if ((buflen -= 12) < 0)
2478                         goto out_resource;
2479                 WRITE64((s64)stat.atime.tv_sec);
2480                 WRITE32(stat.atime.tv_nsec);
2481         }
2482         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2483                 if ((buflen -= 12) < 0)
2484                         goto out_resource;
2485                 WRITE32(0);
2486                 WRITE32(1);
2487                 WRITE32(0);
2488         }
2489         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2490                 if ((buflen -= 12) < 0)
2491                         goto out_resource;
2492                 WRITE64((s64)stat.ctime.tv_sec);
2493                 WRITE32(stat.ctime.tv_nsec);
2494         }
2495         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2496                 if ((buflen -= 12) < 0)
2497                         goto out_resource;
2498                 WRITE64((s64)stat.mtime.tv_sec);
2499                 WRITE32(stat.mtime.tv_nsec);
2500         }
2501         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2502                 if ((buflen -= 8) < 0)
2503                         goto out_resource;
2504                 /*
2505                  * Get parent's attributes if not ignoring crossmount
2506                  * and this is the root of a cross-mounted filesystem.
2507                  */
2508                 if (ignore_crossmnt == 0 &&
2509                     dentry == exp->ex_path.mnt->mnt_root)
2510                         get_parent_attributes(exp, &stat);
2511                 WRITE64(stat.ino);
2512         }
2513         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2514                 status = nfsd4_encode_security_label(rqstp, context,
2515                                 contextlen, &p, &buflen);
2516                 if (status)
2517                         goto out;
2518         }
2519         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2520                 WRITE32(3);
2521                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2522                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2523                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2524         }
2525 
2526         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2527         *buffer = p;
2528         status = nfs_ok;
2529 
2530 out:
2531 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2532         if (context)
2533                 security_release_secctx(context, contextlen);
2534 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2535         kfree(acl);
2536         if (fhp == &tempfh)
2537                 fh_put(&tempfh);
2538         return status;
2539 out_nfserr:
2540         status = nfserrno(err);
2541         goto out;
2542 out_resource:
2543         status = nfserr_resource;
2544         goto out;
2545 out_serverfault:
2546         status = nfserr_serverfault;
2547         goto out;
2548 }
2549 
2550 static inline int attributes_need_mount(u32 *bmval)
2551 {
2552         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2553                 return 1;
2554         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2555                 return 1;
2556         return 0;
2557 }
2558 
2559 static __be32
2560 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2561                 const char *name, int namlen, __be32 **p, int buflen)
2562 {
2563         struct svc_export *exp = cd->rd_fhp->fh_export;
2564         struct dentry *dentry;
2565         __be32 nfserr;
2566         int ignore_crossmnt = 0;
2567 
2568         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2569         if (IS_ERR(dentry))
2570                 return nfserrno(PTR_ERR(dentry));
2571         if (!dentry->d_inode) {
2572                 /*
2573                  * nfsd_buffered_readdir drops the i_mutex between
2574                  * readdir and calling this callback, leaving a window
2575                  * where this directory entry could have gone away.
2576                  */
2577                 dput(dentry);
2578                 return nfserr_noent;
2579         }
2580 
2581         exp_get(exp);
2582         /*
2583          * In the case of a mountpoint, the client may be asking for
2584          * attributes that are only properties of the underlying filesystem
2585          * as opposed to the cross-mounted file system. In such a case,
2586          * we will not follow the cross mount and will fill the attribtutes
2587          * directly from the mountpoint dentry.
2588          */
2589         if (nfsd_mountpoint(dentry, exp)) {
2590                 int err;
2591 
2592                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2593                                 && !attributes_need_mount(cd->rd_bmval)) {
2594                         ignore_crossmnt = 1;
2595                         goto out_encode;
2596                 }
2597                 /*
2598                  * Why the heck aren't we just using nfsd_lookup??
2599                  * Different "."/".." handling?  Something else?
2600                  * At least, add a comment here to explain....
2601                  */
2602                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2603                 if (err) {
2604                         nfserr = nfserrno(err);
2605                         goto out_put;
2606                 }
2607                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2608                 if (nfserr)
2609                         goto out_put;
2610 
2611         }
2612 out_encode:
2613         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2614                                         cd->rd_rqstp, ignore_crossmnt);
2615 out_put:
2616         dput(dentry);
2617         exp_put(exp);
2618         return nfserr;
2619 }
2620 
2621 static __be32 *
2622 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2623 {
2624         __be32 *attrlenp;
2625 
2626         if (buflen < 6)
2627                 return NULL;
2628         *p++ = htonl(2);
2629         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2630         *p++ = htonl(0);                         /* bmval1 */
2631 
2632         attrlenp = p++;
2633         *p++ = nfserr;       /* no htonl */
2634         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2635         return p;
2636 }
2637 
2638 static int
2639 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2640                     loff_t offset, u64 ino, unsigned int d_type)
2641 {
2642         struct readdir_cd *ccd = ccdv;
2643         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2644         int buflen;
2645         __be32 *p = cd->buffer;
2646         __be32 *cookiep;
2647         __be32 nfserr = nfserr_toosmall;
2648 
2649         /* In nfsv4, "." and ".." never make it onto the wire.. */
2650         if (name && isdotent(name, namlen)) {
2651                 cd->common.err = nfs_ok;
2652                 return 0;
2653         }
2654 
2655         if (cd->offset)
2656                 xdr_encode_hyper(cd->offset, (u64) offset);
2657 
2658         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2659         if (buflen < 0)
2660                 goto fail;
2661 
2662         *p++ = xdr_one;                             /* mark entry present */
2663         cookiep = p;
2664         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2665         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2666 
2667         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, &p, buflen);
2668         switch (nfserr) {
2669         case nfs_ok:
2670                 break;
2671         case nfserr_resource:
2672                 nfserr = nfserr_toosmall;
2673                 goto fail;
2674         case nfserr_noent:
2675                 goto skip_entry;
2676         default:
2677                 /*
2678                  * If the client requested the RDATTR_ERROR attribute,
2679                  * we stuff the error code into this attribute
2680                  * and continue.  If this attribute was not requested,
2681                  * then in accordance with the spec, we fail the
2682                  * entire READDIR operation(!)
2683                  */
2684                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2685                         goto fail;
2686                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2687                 if (p == NULL) {
2688                         nfserr = nfserr_toosmall;
2689                         goto fail;
2690                 }
2691         }
2692         cd->buflen -= (p - cd->buffer);
2693         cd->buffer = p;
2694         cd->offset = cookiep;
2695 skip_entry:
2696         cd->common.err = nfs_ok;
2697         return 0;
2698 fail:
2699         cd->common.err = nfserr;
2700         return -EINVAL;
2701 }
2702 
2703 static void
2704 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2705 {
2706         __be32 *p;
2707 
2708         RESERVE_SPACE(sizeof(stateid_t));
2709         WRITE32(sid->si_generation);
2710         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2711         ADJUST_ARGS();
2712 }
2713 
2714 static __be32
2715 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2716 {
2717         __be32 *p;
2718 
2719         if (!nfserr) {
2720                 RESERVE_SPACE(8);
2721                 WRITE32(access->ac_supported);
2722                 WRITE32(access->ac_resp_access);
2723                 ADJUST_ARGS();
2724         }
2725         return nfserr;
2726 }
2727 
2728 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2729 {
2730         __be32 *p;
2731 
2732         if (!nfserr) {
2733                 RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 8);
2734                 WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2735                 WRITE32(bcts->dir);
2736                 /* Sorry, we do not yet support RDMA over 4.1: */
2737                 WRITE32(0);
2738                 ADJUST_ARGS();
2739         }
2740         return nfserr;
2741 }
2742 
2743 static __be32
2744 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2745 {
2746         if (!nfserr)
2747                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2748 
2749         return nfserr;
2750 }
2751 
2752 
2753 static __be32
2754 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2755 {
2756         __be32 *p;
2757 
2758         if (!nfserr) {
2759                 RESERVE_SPACE(NFS4_VERIFIER_SIZE);
2760                 WRITEMEM(commit->co_verf.data, NFS4_VERIFIER_SIZE);
2761                 ADJUST_ARGS();
2762         }
2763         return nfserr;
2764 }
2765 
2766 static __be32
2767 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2768 {
2769         __be32 *p;
2770 
2771         if (!nfserr) {
2772                 RESERVE_SPACE(32);
2773                 write_cinfo(&p, &create->cr_cinfo);
2774                 WRITE32(2);
2775                 WRITE32(create->cr_bmval[0]);
2776                 WRITE32(create->cr_bmval[1]);
2777                 ADJUST_ARGS();
2778         }
2779         return nfserr;
2780 }
2781 
2782 static __be32
2783 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2784 {
2785         struct svc_fh *fhp = getattr->ga_fhp;
2786         int buflen;
2787 
2788         if (nfserr)
2789                 return nfserr;
2790 
2791         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2792         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2793                                     &resp->p, buflen, getattr->ga_bmval,
2794                                     resp->rqstp, 0);
2795         return nfserr;
2796 }
2797 
2798 static __be32
2799 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2800 {
2801         struct svc_fh *fhp = *fhpp;
2802         unsigned int len;
2803         __be32 *p;
2804 
2805         if (!nfserr) {
2806                 len = fhp->fh_handle.fh_size;
2807                 RESERVE_SPACE(len + 4);
2808                 WRITE32(len);
2809                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2810                 ADJUST_ARGS();
2811         }
2812         return nfserr;
2813 }
2814 
2815 /*
2816 * Including all fields other than the name, a LOCK4denied structure requires
2817 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2818 */
2819 static void
2820 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2821 {
2822         struct xdr_netobj *conf = &ld->ld_owner;
2823         __be32 *p;
2824 
2825         RESERVE_SPACE(32 + XDR_LEN(conf->len));
2826         WRITE64(ld->ld_start);
2827         WRITE64(ld->ld_length);
2828         WRITE32(ld->ld_type);
2829         if (conf->len) {
2830                 WRITEMEM(&ld->ld_clientid, 8);
2831                 WRITE32(conf->len);
2832                 WRITEMEM(conf->data, conf->len);
2833                 kfree(conf->data);
2834         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2835                 WRITE64((u64)0); /* clientid */
2836                 WRITE32(0); /* length of owner name */
2837         }
2838         ADJUST_ARGS();
2839 }
2840 
2841 static __be32
2842 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2843 {
2844         if (!nfserr)
2845                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2846         else if (nfserr == nfserr_denied)
2847                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2848 
2849         return nfserr;
2850 }
2851 
2852 static __be32
2853 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2854 {
2855         if (nfserr == nfserr_denied)
2856                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2857         return nfserr;
2858 }
2859 
2860 static __be32
2861 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2862 {
2863         if (!nfserr)
2864                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2865 
2866         return nfserr;
2867 }
2868 
2869 
2870 static __be32
2871 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2872 {
2873         __be32 *p;
2874 
2875         if (!nfserr) {
2876                 RESERVE_SPACE(20);
2877                 write_cinfo(&p, &link->li_cinfo);
2878                 ADJUST_ARGS();
2879         }
2880         return nfserr;
2881 }
2882 
2883 
2884 static __be32
2885 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2886 {
2887         __be32 *p;
2888 
2889         if (nfserr)
2890                 goto out;
2891 
2892         nfsd4_encode_stateid(resp, &open->op_stateid);
2893         RESERVE_SPACE(40);
2894         write_cinfo(&p, &open->op_cinfo);
2895         WRITE32(open->op_rflags);
2896         WRITE32(2);
2897         WRITE32(open->op_bmval[0]);
2898         WRITE32(open->op_bmval[1]);
2899         WRITE32(open->op_delegate_type);
2900         ADJUST_ARGS();
2901 
2902         switch (open->op_delegate_type) {
2903         case NFS4_OPEN_DELEGATE_NONE:
2904                 break;
2905         case NFS4_OPEN_DELEGATE_READ:
2906                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2907                 RESERVE_SPACE(20);
2908                 WRITE32(open->op_recall);
2909 
2910                 /*
2911                  * TODO: ACE's in delegations
2912                  */
2913                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2914                 WRITE32(0);
2915                 WRITE32(0);
2916                 WRITE32(0);   /* XXX: is NULL principal ok? */
2917                 ADJUST_ARGS();
2918                 break;
2919         case NFS4_OPEN_DELEGATE_WRITE:
2920                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2921                 RESERVE_SPACE(32);
2922                 WRITE32(0);
2923 
2924                 /*
2925                  * TODO: space_limit's in delegations
2926                  */
2927                 WRITE32(NFS4_LIMIT_SIZE);
2928                 WRITE32(~(u32)0);
2929                 WRITE32(~(u32)0);
2930 
2931                 /*
2932                  * TODO: ACE's in delegations
2933                  */
2934                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2935                 WRITE32(0);
2936                 WRITE32(0);
2937                 WRITE32(0);   /* XXX: is NULL principal ok? */
2938                 ADJUST_ARGS();
2939                 break;
2940         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
2941                 switch (open->op_why_no_deleg) {
2942                 case WND4_CONTENTION:
2943                 case WND4_RESOURCE:
2944                         RESERVE_SPACE(8);
2945                         WRITE32(open->op_why_no_deleg);
2946                         WRITE32(0);     /* deleg signaling not supported yet */
2947                         break;
2948                 default:
2949                         RESERVE_SPACE(4);
2950                         WRITE32(open->op_why_no_deleg);
2951                 }
2952                 ADJUST_ARGS();
2953                 break;
2954         default:
2955                 BUG();
2956         }
2957         /* XXX save filehandle here */
2958 out:
2959         return nfserr;
2960 }
2961 
2962 static __be32
2963 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2964 {
2965         if (!nfserr)
2966                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2967 
2968         return nfserr;
2969 }
2970 
2971 static __be32
2972 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2973 {
2974         if (!nfserr)
2975                 nfsd4_encode_stateid(resp, &od->od_stateid);
2976 
2977         return nfserr;
2978 }
2979 
2980 static __be32
2981 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2982                   struct nfsd4_read *read)
2983 {
2984         u32 eof;
2985         int v;
2986         struct page *page;
2987         unsigned long maxcount; 
2988         long len;
2989         __be32 *p;
2990 
2991         if (nfserr)
2992                 return nfserr;
2993         if (resp->xbuf->page_len)
2994                 return nfserr_resource;
2995 
2996         RESERVE_SPACE(8); /* eof flag and byte count */
2997 
2998         maxcount = svc_max_payload(resp->rqstp);
2999         if (maxcount > read->rd_length)
3000                 maxcount = read->rd_length;
3001 
3002         len = maxcount;
3003         v = 0;
3004         while (len > 0) {
3005                 page = *(resp->rqstp->rq_next_page);
3006                 if (!page) { /* ran out of pages */
3007                         maxcount -= len;
3008                         break;
3009                 }
3010                 resp->rqstp->rq_vec[v].iov_base = page_address(page);
3011                 resp->rqstp->rq_vec[v].iov_len =
3012                         len < PAGE_SIZE ? len : PAGE_SIZE;
3013                 resp->rqstp->rq_next_page++;
3014                 v++;
3015                 len -= PAGE_SIZE;
3016         }
3017         read->rd_vlen = v;
3018 
3019         nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
3020                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
3021                         &maxcount);
3022 
3023         if (nfserr)
3024                 return nfserr;
3025         eof = (read->rd_offset + maxcount >=
3026                read->rd_fhp->fh_dentry->d_inode->i_size);
3027 
3028         WRITE32(eof);
3029         WRITE32(maxcount);
3030         ADJUST_ARGS();
3031         resp->xbuf->head[0].iov_len = (char*)p
3032                                         - (char*)resp->xbuf->head[0].iov_base;
3033         resp->xbuf->page_len = maxcount;
3034 
3035         /* Use rest of head for padding and remaining ops: */
3036         resp->xbuf->tail[0].iov_base = p;
3037         resp->xbuf->tail[0].iov_len = 0;
3038         if (maxcount&3) {
3039                 RESERVE_SPACE(4);
3040                 WRITE32(0);
3041                 resp->xbuf->tail[0].iov_base += maxcount&3;
3042                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
3043                 ADJUST_ARGS();
3044         }
3045         return 0;
3046 }
3047 
3048 static __be32
3049 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3050 {
3051         int maxcount;
3052         char *page;
3053         __be32 *p;
3054 
3055         if (nfserr)
3056                 return nfserr;
3057         if (resp->xbuf->page_len)
3058                 return nfserr_resource;
3059         if (!*resp->rqstp->rq_next_page)
3060                 return nfserr_resource;
3061 
3062         page = page_address(*(resp->rqstp->rq_next_page++));
3063 
3064         maxcount = PAGE_SIZE;
3065         RESERVE_SPACE(4);
3066 
3067         /*
3068          * XXX: By default, the ->readlink() VFS op will truncate symlinks
3069          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
3070          * not, one easy fix is: if ->readlink() precisely fills the buffer,
3071          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3072          */
3073         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
3074         if (nfserr == nfserr_isdir)
3075                 return nfserr_inval;
3076         if (nfserr)
3077                 return nfserr;
3078 
3079         WRITE32(maxcount);
3080         ADJUST_ARGS();
3081         resp->xbuf->head[0].iov_len = (char*)p
3082                                 - (char*)resp->xbuf->head[0].iov_base;
3083         resp->xbuf->page_len = maxcount;
3084 
3085         /* Use rest of head for padding and remaining ops: */
3086         resp->xbuf->tail[0].iov_base = p;
3087         resp->xbuf->tail[0].iov_len = 0;
3088         if (maxcount&3) {
3089                 RESERVE_SPACE(4);
3090                 WRITE32(0);
3091                 resp->xbuf->tail[0].iov_base += maxcount&3;
3092                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
3093                 ADJUST_ARGS();
3094         }
3095         return 0;
3096 }
3097 
3098 static __be32
3099 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3100 {
3101         int maxcount;
3102         loff_t offset;
3103         __be32 *page, *savep, *tailbase;
3104         __be32 *p;
3105 
3106         if (nfserr)
3107                 return nfserr;
3108         if (resp->xbuf->page_len)
3109                 return nfserr_resource;
3110         if (!*resp->rqstp->rq_next_page)
3111                 return nfserr_resource;
3112 
3113         RESERVE_SPACE(NFS4_VERIFIER_SIZE);
3114         savep = p;
3115 
3116         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3117         WRITE32(0);
3118         WRITE32(0);
3119         ADJUST_ARGS();
3120         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
3121         tailbase = p;
3122 
3123         maxcount = PAGE_SIZE;
3124         if (maxcount > readdir->rd_maxcount)
3125                 maxcount = readdir->rd_maxcount;
3126 
3127         /*
3128          * Convert from bytes to words, account for the two words already
3129          * written, make sure to leave two words at the end for the next
3130          * pointer and eof field.
3131          */
3132         maxcount = (maxcount >> 2) - 4;
3133         if (maxcount < 0) {
3134                 nfserr =  nfserr_toosmall;
3135                 goto err_no_verf;
3136         }
3137 
3138         page = page_address(*(resp->rqstp->rq_next_page++));
3139         readdir->common.err = 0;
3140         readdir->buflen = maxcount;
3141         readdir->buffer = page;
3142         readdir->offset = NULL;
3143 
3144         offset = readdir->rd_cookie;
3145         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3146                               &offset,
3147                               &readdir->common, nfsd4_encode_dirent);
3148         if (nfserr == nfs_ok &&
3149             readdir->common.err == nfserr_toosmall &&
3150             readdir->buffer == page) 
3151                 nfserr = nfserr_toosmall;
3152         if (nfserr)
3153                 goto err_no_verf;
3154 
3155         if (readdir->offset)
3156                 xdr_encode_hyper(readdir->offset, offset);
3157 
3158         p = readdir->buffer;
3159         *p++ = 0;       /* no more entries */
3160         *p++ = htonl(readdir->common.err == nfserr_eof);
3161         resp->xbuf->page_len = ((char*)p) -
3162                 (char*)page_address(*(resp->rqstp->rq_next_page-1));
3163 
3164         /* Use rest of head for padding and remaining ops: */
3165         resp->xbuf->tail[0].iov_base = tailbase;
3166         resp->xbuf->tail[0].iov_len = 0;
3167         resp->p = resp->xbuf->tail[0].iov_base;
3168         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
3169 
3170         return 0;
3171 err_no_verf:
3172         p = savep;
3173         ADJUST_ARGS();
3174         return nfserr;
3175 }
3176 
3177 static __be32
3178 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3179 {
3180         __be32 *p;
3181 
3182         if (!nfserr) {
3183                 RESERVE_SPACE(20);
3184                 write_cinfo(&p, &remove->rm_cinfo);
3185                 ADJUST_ARGS();
3186         }
3187         return nfserr;
3188 }
3189 
3190 static __be32
3191 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3192 {
3193         __be32 *p;
3194 
3195         if (!nfserr) {
3196                 RESERVE_SPACE(40);
3197                 write_cinfo(&p, &rename->rn_sinfo);
3198                 write_cinfo(&p, &rename->rn_tinfo);
3199                 ADJUST_ARGS();
3200         }
3201         return nfserr;
3202 }
3203 
3204 static __be32
3205 nfsd4_do_encode_secinfo(struct nfsd4_compoundres *resp,
3206                          __be32 nfserr, struct svc_export *exp)
3207 {
3208         u32 i, nflavs, supported;
3209         struct exp_flavor_info *flavs;
3210         struct exp_flavor_info def_flavs[2];
3211         __be32 *p, *flavorsp;
3212         static bool report = true;
3213 
3214         if (nfserr)
3215                 goto out;
3216         if (exp->ex_nflavors) {
3217                 flavs = exp->ex_flavors;
3218                 nflavs = exp->ex_nflavors;
3219         } else { /* Handling of some defaults in absence of real secinfo: */
3220                 flavs = def_flavs;
3221                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3222                         nflavs = 2;
3223                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3224                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3225                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3226                         nflavs = 1;
3227                         flavs[0].pseudoflavor
3228                                         = svcauth_gss_flavor(exp->ex_client);
3229                 } else {
3230                         nflavs = 1;
3231                         flavs[0].pseudoflavor
3232                                         = exp->ex_client->flavour->flavour;
3233                 }
3234         }
3235 
3236         supported = 0;
3237         RESERVE_SPACE(4);
3238         flavorsp = p++;         /* to be backfilled later */
3239         ADJUST_ARGS();
3240 
3241         for (i = 0; i < nflavs; i++) {
3242                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3243                 struct rpcsec_gss_info info;
3244 
3245                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3246                         supported++;
3247                         RESERVE_SPACE(4 + 4 + info.oid.len + 4 + 4);
3248                         WRITE32(RPC_AUTH_GSS);
3249                         WRITE32(info.oid.len);
3250                         WRITEMEM(info.oid.data, info.oid.len);
3251                         WRITE32(info.qop);
3252                         WRITE32(info.service);
3253                         ADJUST_ARGS();
3254                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3255                         supported++;
3256                         RESERVE_SPACE(4);
3257                         WRITE32(pf);
3258                         ADJUST_ARGS();
3259                 } else {
3260                         if (report)
3261                                 pr_warn("NFS: SECINFO: security flavor %u "
3262                                         "is not supported\n", pf);
3263                 }
3264         }
3265 
3266         if (nflavs != supported)
3267                 report = false;
3268         *flavorsp = htonl(supported);
3269 
3270 out:
3271         if (exp)
3272                 exp_put(exp);
3273         return nfserr;
3274 }
3275 
3276 static __be32
3277 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3278                      struct nfsd4_secinfo *secinfo)
3279 {
3280         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->si_exp);
3281 }
3282 
3283 static __be32
3284 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3285                      struct nfsd4_secinfo_no_name *secinfo)
3286 {
3287         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->sin_exp);
3288 }
3289 
3290 /*
3291  * The SETATTR encode routine is special -- it always encodes a bitmap,
3292  * regardless of the error status.
3293  */
3294 static __be32
3295 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3296 {
3297         __be32 *p;
3298 
3299         RESERVE_SPACE(16);
3300         if (nfserr) {
3301                 WRITE32(3);
3302                 WRITE32(0);
3303                 WRITE32(0);
3304                 WRITE32(0);
3305         }
3306         else {
3307                 WRITE32(3);
3308                 WRITE32(setattr->sa_bmval[0]);
3309                 WRITE32(setattr->sa_bmval[1]);
3310                 WRITE32(setattr->sa_bmval[2]);
3311         }
3312         ADJUST_ARGS();
3313         return nfserr;
3314 }
3315 
3316 static __be32
3317 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3318 {
3319         __be32 *p;
3320 
3321         if (!nfserr) {
3322                 RESERVE_SPACE(8 + NFS4_VERIFIER_SIZE);
3323                 WRITEMEM(&scd->se_clientid, 8);
3324                 WRITEMEM(&scd->se_confirm, NFS4_VERIFIER_SIZE);
3325                 ADJUST_ARGS();
3326         }
3327         else if (nfserr == nfserr_clid_inuse) {
3328                 RESERVE_SPACE(8);
3329                 WRITE32(0);
3330                 WRITE32(0);
3331                 ADJUST_ARGS();
3332         }
3333         return nfserr;
3334 }
3335 
3336 static __be32
3337 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3338 {
3339         __be32 *p;
3340 
3341         if (!nfserr) {
3342                 RESERVE_SPACE(16);
3343                 WRITE32(write->wr_bytes_written);
3344                 WRITE32(write->wr_how_written);
3345                 WRITEMEM(write->wr_verifier.data, NFS4_VERIFIER_SIZE);
3346                 ADJUST_ARGS();
3347         }
3348         return nfserr;
3349 }
3350 
3351 static const u32 nfs4_minimal_spo_must_enforce[2] = {
3352         [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3353               1 << (OP_EXCHANGE_ID - 32) |
3354               1 << (OP_CREATE_SESSION - 32) |
3355               1 << (OP_DESTROY_SESSION - 32) |
3356               1 << (OP_DESTROY_CLIENTID - 32)
3357 };
3358 
3359 static __be32
3360 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3361                          struct nfsd4_exchange_id *exid)
3362 {
3363         __be32 *p;
3364         char *major_id;
3365         char *server_scope;
3366         int major_id_sz;
3367         int server_scope_sz;
3368         uint64_t minor_id = 0;
3369 
3370         if (nfserr)
3371                 return nfserr;
3372 
3373         major_id = utsname()->nodename;
3374         major_id_sz = strlen(major_id);
3375         server_scope = utsname()->nodename;
3376         server_scope_sz = strlen(server_scope);
3377 
3378         RESERVE_SPACE(
3379                 8 /* eir_clientid */ +
3380                 4 /* eir_sequenceid */ +
3381                 4 /* eir_flags */ +
3382                 4 /* spr_how */ +
3383                 8 /* spo_must_enforce, spo_must_allow */ +
3384                 8 /* so_minor_id */ +
3385                 4 /* so_major_id.len */ +
3386                 (XDR_QUADLEN(major_id_sz) * 4) +
3387                 4 /* eir_server_scope.len */ +
3388                 (XDR_QUADLEN(server_scope_sz) * 4) +
3389                 4 /* eir_server_impl_id.count (0) */);
3390 
3391         WRITEMEM(&exid->clientid, 8);
3392         WRITE32(exid->seqid);
3393         WRITE32(exid->flags);
3394 
3395         WRITE32(exid->spa_how);
3396         switch (exid->spa_how) {
3397         case SP4_NONE:
3398                 break;
3399         case SP4_MACH_CRED:
3400                 /* spo_must_enforce bitmap: */
3401                 WRITE32(2);
3402                 WRITE32(nfs4_minimal_spo_must_enforce[0]);
3403                 WRITE32(nfs4_minimal_spo_must_enforce[1]);
3404                 /* empty spo_must_allow bitmap: */
3405                 WRITE32(0);
3406                 break;
3407         default:
3408                 WARN_ON_ONCE(1);
3409         }
3410 
3411         /* The server_owner struct */
3412         WRITE64(minor_id);      /* Minor id */
3413         /* major id */
3414         WRITE32(major_id_sz);
3415         WRITEMEM(major_id, major_id_sz);
3416 
3417         /* Server scope */
3418         WRITE32(server_scope_sz);
3419         WRITEMEM(server_scope, server_scope_sz);
3420 
3421         /* Implementation id */
3422         WRITE32(0);     /* zero length nfs_impl_id4 array */
3423         ADJUST_ARGS();
3424         return 0;
3425 }
3426 
3427 static __be32
3428 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3429                             struct nfsd4_create_session *sess)
3430 {
3431         __be32 *p;
3432 
3433         if (nfserr)
3434                 return nfserr;
3435 
3436         RESERVE_SPACE(24);
3437         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3438         WRITE32(sess->seqid);
3439         WRITE32(sess->flags);
3440         ADJUST_ARGS();
3441 
3442         RESERVE_SPACE(28);
3443         WRITE32(0); /* headerpadsz */
3444         WRITE32(sess->fore_channel.maxreq_sz);
3445         WRITE32(sess->fore_channel.maxresp_sz);
3446         WRITE32(sess->fore_channel.maxresp_cached);
3447         WRITE32(sess->fore_channel.maxops);
3448         WRITE32(sess->fore_channel.maxreqs);
3449         WRITE32(sess->fore_channel.nr_rdma_attrs);
3450         ADJUST_ARGS();
3451 
3452         if (sess->fore_channel.nr_rdma_attrs) {
3453                 RESERVE_SPACE(4);
3454                 WRITE32(sess->fore_channel.rdma_attrs);
3455                 ADJUST_ARGS();
3456         }
3457 
3458         RESERVE_SPACE(28);
3459         WRITE32(0); /* headerpadsz */
3460         WRITE32(sess->back_channel.maxreq_sz);
3461         WRITE32(sess->back_channel.maxresp_sz);
3462         WRITE32(sess->back_channel.maxresp_cached);
3463         WRITE32(sess->back_channel.maxops);
3464         WRITE32(sess->back_channel.maxreqs);
3465         WRITE32(sess->back_channel.nr_rdma_attrs);
3466         ADJUST_ARGS();
3467 
3468         if (sess->back_channel.nr_rdma_attrs) {
3469                 RESERVE_SPACE(4);
3470                 WRITE32(sess->back_channel.rdma_attrs);
3471                 ADJUST_ARGS();
3472         }
3473         return 0;
3474 }
3475 
3476 static __be32
3477 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3478                              struct nfsd4_destroy_session *destroy_session)
3479 {
3480         return nfserr;
3481 }
3482 
3483 static __be32
3484 nfsd4_encode_free_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3485                           struct nfsd4_free_stateid *free_stateid)
3486 {
3487         __be32 *p;
3488 
3489         if (nfserr)
3490                 return nfserr;
3491 
3492         RESERVE_SPACE(4);
3493         *p++ = nfserr;
3494         ADJUST_ARGS();
3495         return nfserr;
3496 }
3497 
3498 static __be32
3499 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3500                       struct nfsd4_sequence *seq)
3501 {
3502         __be32 *p;
3503 
3504         if (nfserr)
3505                 return nfserr;
3506 
3507         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3508         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3509         WRITE32(seq->seqid);
3510         WRITE32(seq->slotid);
3511         /* Note slotid's are numbered from zero: */
3512         WRITE32(seq->maxslots - 1); /* sr_highest_slotid */
3513         WRITE32(seq->maxslots - 1); /* sr_target_highest_slotid */
3514         WRITE32(seq->status_flags);
3515 
3516         ADJUST_ARGS();
3517         resp->cstate.datap = p; /* DRC cache data pointer */
3518         return 0;
3519 }
3520 
3521 static __be32
3522 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3523                           struct nfsd4_test_stateid *test_stateid)
3524 {
3525         struct nfsd4_test_stateid_id *stateid, *next;
3526         __be32 *p;
3527 
3528         RESERVE_SPACE(4 + (4 * test_stateid->ts_num_ids));
3529         *p++ = htonl(test_stateid->ts_num_ids);
3530 
3531         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3532                 *p++ = stateid->ts_id_status;
3533         }
3534 
3535         ADJUST_ARGS();
3536         return nfserr;
3537 }
3538 
3539 static __be32
3540 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3541 {
3542         return nfserr;
3543 }
3544 
3545 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3546 
3547 /*
3548  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3549  * since we don't need to filter out obsolete ops as this is
3550  * done in the decoding phase.
3551  */
3552 static nfsd4_enc nfsd4_enc_ops[] = {
3553         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3554         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3555         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3556         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3557         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3558         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3559         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3560         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3561         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3562         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3563         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3564         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3565         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3566         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3567         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3568         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3569         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3570         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3571         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3572         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3573         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3574         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3575         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3576         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3577         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3578         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3579         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3580         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3581         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3582         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3583         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3584         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3585         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3586         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3587         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3588         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3589         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3590 
3591         /* NFSv4.1 operations */
3592         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3593         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3594         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3595         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3596         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
3597         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_free_stateid,
3598         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3599         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3600         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3601         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3602         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3603         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3604         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3605         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3606         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3607         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
3608         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3609         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3610         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3611 };
3612 
3613 /*
3614  * Calculate the total amount of memory that the compound response has taken
3615  * after encoding the current operation with pad.
3616  *
3617  * pad: if operation is non-idempotent, pad was calculate by op_rsize_bop()
3618  *      which was specified at nfsd4_operation, else pad is zero.
3619  *
3620  * Compare this length to the session se_fmaxresp_sz and se_fmaxresp_cached.
3621  *
3622  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3623  * will be at least a page and will therefore hold the xdr_buf head.
3624  */
3625 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 pad)
3626 {
3627         struct xdr_buf *xb = &resp->rqstp->rq_res;
3628         struct nfsd4_session *session = NULL;
3629         struct nfsd4_slot *slot = resp->cstate.slot;
3630         u32 length, tlen = 0;
3631 
3632         if (!nfsd4_has_session(&resp->cstate))
3633                 return 0;
3634 
3635         session = resp->cstate.session;
3636         if (session == NULL)
3637                 return 0;
3638 
3639         if (xb->page_len == 0) {
3640                 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3641         } else {
3642                 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3643                         tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3644 
3645                 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3646         }
3647         dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3648                 length, xb->page_len, tlen, pad);
3649 
3650         if (length > session->se_fchannel.maxresp_sz)
3651                 return nfserr_rep_too_big;
3652 
3653         if ((slot->sl_flags & NFSD4_SLOT_CACHETHIS) &&
3654             length > session->se_fchannel.maxresp_cached)
3655                 return nfserr_rep_too_big_to_cache;
3656 
3657         return 0;
3658 }
3659 
3660 void
3661 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3662 {
3663         struct nfs4_stateowner *so = resp->cstate.replay_owner;
3664         __be32 *statp;
3665         __be32 *p;
3666 
3667         RESERVE_SPACE(8);
3668         WRITE32(op->opnum);
3669         statp = p++;    /* to be backfilled at the end */
3670         ADJUST_ARGS();
3671 
3672         if (op->opnum == OP_ILLEGAL)
3673                 goto status;
3674         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3675                !nfsd4_enc_ops[op->opnum]);
3676         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3677         /* nfsd4_check_drc_limit guarantees enough room for error status */
3678         if (!op->status)
3679                 op->status = nfsd4_check_resp_size(resp, 0);
3680         if (so) {
3681                 so->so_replay.rp_status = op->status;
3682                 so->so_replay.rp_buflen = (char *)resp->p - (char *)(statp+1);
3683                 memcpy(so->so_replay.rp_buf, statp+1, so->so_replay.rp_buflen);
3684         }
3685 status:
3686         /*
3687          * Note: We write the status directly, instead of using WRITE32(),
3688          * since it is already in network byte order.
3689          */
3690         *statp = op->status;
3691 }
3692 
3693 /* 
3694  * Encode the reply stored in the stateowner reply cache 
3695  * 
3696  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3697  * previously sent already encoded operation.
3698  *
3699  * called with nfs4_lock_state() held
3700  */
3701 void
3702 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3703 {
3704         __be32 *p;
3705         struct nfs4_replay *rp = op->replay;
3706 
3707         BUG_ON(!rp);
3708 
3709         RESERVE_SPACE(8);
3710         WRITE32(op->opnum);
3711         *p++ = rp->rp_status;  /* already xdr'ed */
3712         ADJUST_ARGS();
3713 
3714         RESERVE_SPACE(rp->rp_buflen);
3715         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3716         ADJUST_ARGS();
3717 }
3718 
3719 int
3720 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3721 {
3722         return xdr_ressize_check(rqstp, p);
3723 }
3724 
3725 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
3726 {
3727         struct svc_rqst *rqstp = rq;
3728         struct nfsd4_compoundargs *args = rqstp->rq_argp;
3729 
3730         if (args->ops != args->iops) {
3731                 kfree(args->ops);
3732                 args->ops = args->iops;
3733         }
3734         kfree(args->tmpp);
3735         args->tmpp = NULL;
3736         while (args->to_free) {
3737                 struct tmpbuf *tb = args->to_free;
3738                 args->to_free = tb->next;
3739                 tb->release(tb->buf);
3740                 kfree(tb);
3741         }
3742         return 1;
3743 }
3744 
3745 int
3746 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3747 {
3748         args->p = p;
3749         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3750         args->pagelist = rqstp->rq_arg.pages;
3751         args->pagelen = rqstp->rq_arg.page_len;
3752         args->tmpp = NULL;
3753         args->to_free = NULL;
3754         args->ops = args->iops;
3755         args->rqstp = rqstp;
3756 
3757         return !nfsd4_decode_compound(args);
3758 }
3759 
3760 int
3761 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3762 {
3763         /*
3764          * All that remains is to write the tag and operation count...
3765          */
3766         struct nfsd4_compound_state *cs = &resp->cstate;
3767         struct kvec *iov;
3768         p = resp->tagp;
3769         *p++ = htonl(resp->taglen);
3770         memcpy(p, resp->tag, resp->taglen);
3771         p += XDR_QUADLEN(resp->taglen);
3772         *p++ = htonl(resp->opcnt);
3773 
3774         if (rqstp->rq_res.page_len) 
3775                 iov = &rqstp->rq_res.tail[0];
3776         else
3777                 iov = &rqstp->rq_res.head[0];
3778         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3779         BUG_ON(iov->iov_len > PAGE_SIZE);
3780         if (nfsd4_has_session(cs)) {
3781                 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3782                 struct nfs4_client *clp = cs->session->se_client;
3783                 if (cs->status != nfserr_replay_cache) {
3784                         nfsd4_store_cache_entry(resp);
3785                         cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
3786                 }
3787                 /* Renew the clientid on success and on replay */
3788                 spin_lock(&nn->client_lock);
3789                 nfsd4_put_session(cs->session);
3790                 spin_unlock(&nn->client_lock);
3791                 put_client_renew(clp);
3792         }
3793         return 1;
3794 }
3795 
3796 /*
3797  * Local variables:
3798  *  c-basic-offset: 8
3799  * End:
3800  */
3801 

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