xref: /openbmc/linux/fs/nfsd/nfs4xdr.c (revision fd589a8f)
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/param.h>
44 #include <linux/smp.h>
45 #include <linux/fs.h>
46 #include <linux/namei.h>
47 #include <linux/vfs.h>
48 #include <linux/utsname.h>
49 #include <linux/sunrpc/xdr.h>
50 #include <linux/sunrpc/svc.h>
51 #include <linux/sunrpc/clnt.h>
52 #include <linux/nfsd/nfsd.h>
53 #include <linux/nfsd/state.h>
54 #include <linux/nfsd/xdr4.h>
55 #include <linux/nfsd_idmap.h>
56 #include <linux/nfs4.h>
57 #include <linux/nfs4_acl.h>
58 #include <linux/sunrpc/gss_api.h>
59 #include <linux/sunrpc/svcauth_gss.h>
60 
61 #define NFSDDBG_FACILITY		NFSDDBG_XDR
62 
63 /*
64  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
65  * directory in order to indicate to the client that a filesystem boundary is present
66  * We use a fixed fsid for a referral
67  */
68 #define NFS4_REFERRAL_FSID_MAJOR	0x8000000ULL
69 #define NFS4_REFERRAL_FSID_MINOR	0x8000000ULL
70 
71 static __be32
72 check_filename(char *str, int len, __be32 err)
73 {
74 	int i;
75 
76 	if (len == 0)
77 		return nfserr_inval;
78 	if (isdotent(str, len))
79 		return err;
80 	for (i = 0; i < len; i++)
81 		if (str[i] == '/')
82 			return err;
83 	return 0;
84 }
85 
86 #define DECODE_HEAD				\
87 	__be32 *p;				\
88 	__be32 status
89 #define DECODE_TAIL				\
90 	status = 0;				\
91 out:						\
92 	return status;				\
93 xdr_error:					\
94 	dprintk("NFSD: xdr error (%s:%d)\n",	\
95 			__FILE__, __LINE__);	\
96 	status = nfserr_bad_xdr;		\
97 	goto out
98 
99 #define READ32(x)         (x) = ntohl(*p++)
100 #define READ64(x)         do {			\
101 	(x) = (u64)ntohl(*p++) << 32;		\
102 	(x) |= ntohl(*p++);			\
103 } while (0)
104 #define READTIME(x)       do {			\
105 	p++;					\
106 	(x) = ntohl(*p++);			\
107 	p++;					\
108 } while (0)
109 #define READMEM(x,nbytes) do {			\
110 	x = (char *)p;				\
111 	p += XDR_QUADLEN(nbytes);		\
112 } while (0)
113 #define SAVEMEM(x,nbytes) do {			\
114 	if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
115  		savemem(argp, p, nbytes) :	\
116  		(char *)p)) {			\
117 		dprintk("NFSD: xdr error (%s:%d)\n", \
118 				__FILE__, __LINE__); \
119 		goto xdr_error;			\
120 		}				\
121 	p += XDR_QUADLEN(nbytes);		\
122 } while (0)
123 #define COPYMEM(x,nbytes) do {			\
124 	memcpy((x), p, nbytes);			\
125 	p += XDR_QUADLEN(nbytes);		\
126 } while (0)
127 
128 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
129 #define READ_BUF(nbytes)  do {			\
130 	if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {	\
131 		p = argp->p;			\
132 		argp->p += XDR_QUADLEN(nbytes);	\
133 	} else if (!(p = read_buf(argp, nbytes))) { \
134 		dprintk("NFSD: xdr error (%s:%d)\n", \
135 				__FILE__, __LINE__); \
136 		goto xdr_error;			\
137 	}					\
138 } while (0)
139 
140 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
141 {
142 	/* We want more bytes than seem to be available.
143 	 * Maybe we need a new page, maybe we have just run out
144 	 */
145 	unsigned int avail = (char *)argp->end - (char *)argp->p;
146 	__be32 *p;
147 	if (avail + argp->pagelen < nbytes)
148 		return NULL;
149 	if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
150 		return NULL;
151 	/* ok, we can do it with the current plus the next page */
152 	if (nbytes <= sizeof(argp->tmp))
153 		p = argp->tmp;
154 	else {
155 		kfree(argp->tmpp);
156 		p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
157 		if (!p)
158 			return NULL;
159 
160 	}
161 	/*
162 	 * The following memcpy is safe because read_buf is always
163 	 * called with nbytes > avail, and the two cases above both
164 	 * guarantee p points to at least nbytes bytes.
165 	 */
166 	memcpy(p, argp->p, avail);
167 	/* step to next page */
168 	argp->p = page_address(argp->pagelist[0]);
169 	argp->pagelist++;
170 	if (argp->pagelen < PAGE_SIZE) {
171 		argp->end = p + (argp->pagelen>>2);
172 		argp->pagelen = 0;
173 	} else {
174 		argp->end = p + (PAGE_SIZE>>2);
175 		argp->pagelen -= PAGE_SIZE;
176 	}
177 	memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
178 	argp->p += XDR_QUADLEN(nbytes - avail);
179 	return p;
180 }
181 
182 static int zero_clientid(clientid_t *clid)
183 {
184 	return (clid->cl_boot == 0) && (clid->cl_id == 0);
185 }
186 
187 static int
188 defer_free(struct nfsd4_compoundargs *argp,
189 		void (*release)(const void *), void *p)
190 {
191 	struct tmpbuf *tb;
192 
193 	tb = kmalloc(sizeof(*tb), GFP_KERNEL);
194 	if (!tb)
195 		return -ENOMEM;
196 	tb->buf = p;
197 	tb->release = release;
198 	tb->next = argp->to_free;
199 	argp->to_free = tb;
200 	return 0;
201 }
202 
203 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
204 {
205 	if (p == argp->tmp) {
206 		p = kmalloc(nbytes, GFP_KERNEL);
207 		if (!p)
208 			return NULL;
209 		memcpy(p, argp->tmp, nbytes);
210 	} else {
211 		BUG_ON(p != argp->tmpp);
212 		argp->tmpp = NULL;
213 	}
214 	if (defer_free(argp, kfree, p)) {
215 		kfree(p);
216 		return NULL;
217 	} else
218 		return (char *)p;
219 }
220 
221 static __be32
222 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
223 {
224 	u32 bmlen;
225 	DECODE_HEAD;
226 
227 	bmval[0] = 0;
228 	bmval[1] = 0;
229 	bmval[2] = 0;
230 
231 	READ_BUF(4);
232 	READ32(bmlen);
233 	if (bmlen > 1000)
234 		goto xdr_error;
235 
236 	READ_BUF(bmlen << 2);
237 	if (bmlen > 0)
238 		READ32(bmval[0]);
239 	if (bmlen > 1)
240 		READ32(bmval[1]);
241 	if (bmlen > 2)
242 		READ32(bmval[2]);
243 
244 	DECODE_TAIL;
245 }
246 
247 static __be32
248 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
249 		   struct iattr *iattr, struct nfs4_acl **acl)
250 {
251 	int expected_len, len = 0;
252 	u32 dummy32;
253 	char *buf;
254 	int host_err;
255 
256 	DECODE_HEAD;
257 	iattr->ia_valid = 0;
258 	if ((status = nfsd4_decode_bitmap(argp, bmval)))
259 		return status;
260 
261 	READ_BUF(4);
262 	READ32(expected_len);
263 
264 	if (bmval[0] & FATTR4_WORD0_SIZE) {
265 		READ_BUF(8);
266 		len += 8;
267 		READ64(iattr->ia_size);
268 		iattr->ia_valid |= ATTR_SIZE;
269 	}
270 	if (bmval[0] & FATTR4_WORD0_ACL) {
271 		int nace;
272 		struct nfs4_ace *ace;
273 
274 		READ_BUF(4); len += 4;
275 		READ32(nace);
276 
277 		if (nace > NFS4_ACL_MAX)
278 			return nfserr_resource;
279 
280 		*acl = nfs4_acl_new(nace);
281 		if (*acl == NULL) {
282 			host_err = -ENOMEM;
283 			goto out_nfserr;
284 		}
285 		defer_free(argp, kfree, *acl);
286 
287 		(*acl)->naces = nace;
288 		for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
289 			READ_BUF(16); len += 16;
290 			READ32(ace->type);
291 			READ32(ace->flag);
292 			READ32(ace->access_mask);
293 			READ32(dummy32);
294 			READ_BUF(dummy32);
295 			len += XDR_QUADLEN(dummy32) << 2;
296 			READMEM(buf, dummy32);
297 			ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
298 			host_err = 0;
299 			if (ace->whotype != NFS4_ACL_WHO_NAMED)
300 				ace->who = 0;
301 			else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
302 				host_err = nfsd_map_name_to_gid(argp->rqstp,
303 						buf, dummy32, &ace->who);
304 			else
305 				host_err = nfsd_map_name_to_uid(argp->rqstp,
306 						buf, dummy32, &ace->who);
307 			if (host_err)
308 				goto out_nfserr;
309 		}
310 	} else
311 		*acl = NULL;
312 	if (bmval[1] & FATTR4_WORD1_MODE) {
313 		READ_BUF(4);
314 		len += 4;
315 		READ32(iattr->ia_mode);
316 		iattr->ia_mode &= (S_IFMT | S_IALLUGO);
317 		iattr->ia_valid |= ATTR_MODE;
318 	}
319 	if (bmval[1] & FATTR4_WORD1_OWNER) {
320 		READ_BUF(4);
321 		len += 4;
322 		READ32(dummy32);
323 		READ_BUF(dummy32);
324 		len += (XDR_QUADLEN(dummy32) << 2);
325 		READMEM(buf, dummy32);
326 		if ((host_err = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
327 			goto out_nfserr;
328 		iattr->ia_valid |= ATTR_UID;
329 	}
330 	if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
331 		READ_BUF(4);
332 		len += 4;
333 		READ32(dummy32);
334 		READ_BUF(dummy32);
335 		len += (XDR_QUADLEN(dummy32) << 2);
336 		READMEM(buf, dummy32);
337 		if ((host_err = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
338 			goto out_nfserr;
339 		iattr->ia_valid |= ATTR_GID;
340 	}
341 	if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
342 		READ_BUF(4);
343 		len += 4;
344 		READ32(dummy32);
345 		switch (dummy32) {
346 		case NFS4_SET_TO_CLIENT_TIME:
347 			/* We require the high 32 bits of 'seconds' to be 0, and we ignore
348 			   all 32 bits of 'nseconds'. */
349 			READ_BUF(12);
350 			len += 12;
351 			READ32(dummy32);
352 			if (dummy32)
353 				return nfserr_inval;
354 			READ32(iattr->ia_atime.tv_sec);
355 			READ32(iattr->ia_atime.tv_nsec);
356 			if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
357 				return nfserr_inval;
358 			iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
359 			break;
360 		case NFS4_SET_TO_SERVER_TIME:
361 			iattr->ia_valid |= ATTR_ATIME;
362 			break;
363 		default:
364 			goto xdr_error;
365 		}
366 	}
367 	if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
368 		READ_BUF(4);
369 		len += 4;
370 		READ32(dummy32);
371 		switch (dummy32) {
372 		case NFS4_SET_TO_CLIENT_TIME:
373 			/* We require the high 32 bits of 'seconds' to be 0, and we ignore
374 			   all 32 bits of 'nseconds'. */
375 			READ_BUF(12);
376 			len += 12;
377 			READ32(dummy32);
378 			if (dummy32)
379 				return nfserr_inval;
380 			READ32(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 	if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
394 	    || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
395 	    || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
396 		READ_BUF(expected_len - len);
397 	else if (len != expected_len)
398 		goto xdr_error;
399 
400 	DECODE_TAIL;
401 
402 out_nfserr:
403 	status = nfserrno(host_err);
404 	goto out;
405 }
406 
407 static __be32
408 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
409 {
410 	DECODE_HEAD;
411 
412 	READ_BUF(sizeof(stateid_t));
413 	READ32(sid->si_generation);
414 	COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
415 
416 	DECODE_TAIL;
417 }
418 
419 static __be32
420 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
421 {
422 	DECODE_HEAD;
423 
424 	READ_BUF(4);
425 	READ32(access->ac_req_access);
426 
427 	DECODE_TAIL;
428 }
429 
430 static __be32
431 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
432 {
433 	DECODE_HEAD;
434 
435 	close->cl_stateowner = NULL;
436 	READ_BUF(4);
437 	READ32(close->cl_seqid);
438 	return nfsd4_decode_stateid(argp, &close->cl_stateid);
439 
440 	DECODE_TAIL;
441 }
442 
443 
444 static __be32
445 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
446 {
447 	DECODE_HEAD;
448 
449 	READ_BUF(12);
450 	READ64(commit->co_offset);
451 	READ32(commit->co_count);
452 
453 	DECODE_TAIL;
454 }
455 
456 static __be32
457 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
458 {
459 	DECODE_HEAD;
460 
461 	READ_BUF(4);
462 	READ32(create->cr_type);
463 	switch (create->cr_type) {
464 	case NF4LNK:
465 		READ_BUF(4);
466 		READ32(create->cr_linklen);
467 		READ_BUF(create->cr_linklen);
468 		SAVEMEM(create->cr_linkname, create->cr_linklen);
469 		break;
470 	case NF4BLK:
471 	case NF4CHR:
472 		READ_BUF(8);
473 		READ32(create->cr_specdata1);
474 		READ32(create->cr_specdata2);
475 		break;
476 	case NF4SOCK:
477 	case NF4FIFO:
478 	case NF4DIR:
479 	default:
480 		break;
481 	}
482 
483 	READ_BUF(4);
484 	READ32(create->cr_namelen);
485 	READ_BUF(create->cr_namelen);
486 	SAVEMEM(create->cr_name, create->cr_namelen);
487 	if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
488 		return status;
489 
490 	status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
491 				    &create->cr_acl);
492 	if (status)
493 		goto out;
494 
495 	DECODE_TAIL;
496 }
497 
498 static inline __be32
499 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
500 {
501 	return nfsd4_decode_stateid(argp, &dr->dr_stateid);
502 }
503 
504 static inline __be32
505 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
506 {
507 	return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
508 }
509 
510 static __be32
511 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
512 {
513 	DECODE_HEAD;
514 
515 	READ_BUF(4);
516 	READ32(link->li_namelen);
517 	READ_BUF(link->li_namelen);
518 	SAVEMEM(link->li_name, link->li_namelen);
519 	if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
520 		return status;
521 
522 	DECODE_TAIL;
523 }
524 
525 static __be32
526 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
527 {
528 	DECODE_HEAD;
529 
530 	lock->lk_replay_owner = NULL;
531 	/*
532 	* type, reclaim(boolean), offset, length, new_lock_owner(boolean)
533 	*/
534 	READ_BUF(28);
535 	READ32(lock->lk_type);
536 	if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
537 		goto xdr_error;
538 	READ32(lock->lk_reclaim);
539 	READ64(lock->lk_offset);
540 	READ64(lock->lk_length);
541 	READ32(lock->lk_is_new);
542 
543 	if (lock->lk_is_new) {
544 		READ_BUF(4);
545 		READ32(lock->lk_new_open_seqid);
546 		status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
547 		if (status)
548 			return status;
549 		READ_BUF(8 + sizeof(clientid_t));
550 		READ32(lock->lk_new_lock_seqid);
551 		COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
552 		READ32(lock->lk_new_owner.len);
553 		READ_BUF(lock->lk_new_owner.len);
554 		READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
555 	} else {
556 		status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
557 		if (status)
558 			return status;
559 		READ_BUF(4);
560 		READ32(lock->lk_old_lock_seqid);
561 	}
562 
563 	DECODE_TAIL;
564 }
565 
566 static __be32
567 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
568 {
569 	DECODE_HEAD;
570 
571 	READ_BUF(32);
572 	READ32(lockt->lt_type);
573 	if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
574 		goto xdr_error;
575 	READ64(lockt->lt_offset);
576 	READ64(lockt->lt_length);
577 	COPYMEM(&lockt->lt_clientid, 8);
578 	READ32(lockt->lt_owner.len);
579 	READ_BUF(lockt->lt_owner.len);
580 	READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
581 
582 	if (argp->minorversion && !zero_clientid(&lockt->lt_clientid))
583 		return nfserr_inval;
584 	DECODE_TAIL;
585 }
586 
587 static __be32
588 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
589 {
590 	DECODE_HEAD;
591 
592 	locku->lu_stateowner = NULL;
593 	READ_BUF(8);
594 	READ32(locku->lu_type);
595 	if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
596 		goto xdr_error;
597 	READ32(locku->lu_seqid);
598 	status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
599 	if (status)
600 		return status;
601 	READ_BUF(16);
602 	READ64(locku->lu_offset);
603 	READ64(locku->lu_length);
604 
605 	DECODE_TAIL;
606 }
607 
608 static __be32
609 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
610 {
611 	DECODE_HEAD;
612 
613 	READ_BUF(4);
614 	READ32(lookup->lo_len);
615 	READ_BUF(lookup->lo_len);
616 	SAVEMEM(lookup->lo_name, lookup->lo_len);
617 	if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
618 		return status;
619 
620 	DECODE_TAIL;
621 }
622 
623 static __be32
624 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
625 {
626 	DECODE_HEAD;
627 
628 	memset(open->op_bmval, 0, sizeof(open->op_bmval));
629 	open->op_iattr.ia_valid = 0;
630 	open->op_stateowner = NULL;
631 
632 	/* seqid, share_access, share_deny, clientid, ownerlen */
633 	READ_BUF(16 + sizeof(clientid_t));
634 	READ32(open->op_seqid);
635 	READ32(open->op_share_access);
636 	READ32(open->op_share_deny);
637 	COPYMEM(&open->op_clientid, sizeof(clientid_t));
638 	READ32(open->op_owner.len);
639 
640 	/* owner, open_flag */
641 	READ_BUF(open->op_owner.len + 4);
642 	SAVEMEM(open->op_owner.data, open->op_owner.len);
643 	READ32(open->op_create);
644 	switch (open->op_create) {
645 	case NFS4_OPEN_NOCREATE:
646 		break;
647 	case NFS4_OPEN_CREATE:
648 		READ_BUF(4);
649 		READ32(open->op_createmode);
650 		switch (open->op_createmode) {
651 		case NFS4_CREATE_UNCHECKED:
652 		case NFS4_CREATE_GUARDED:
653 			status = nfsd4_decode_fattr(argp, open->op_bmval,
654 				&open->op_iattr, &open->op_acl);
655 			if (status)
656 				goto out;
657 			break;
658 		case NFS4_CREATE_EXCLUSIVE:
659 			READ_BUF(8);
660 			COPYMEM(open->op_verf.data, 8);
661 			break;
662 		case NFS4_CREATE_EXCLUSIVE4_1:
663 			if (argp->minorversion < 1)
664 				goto xdr_error;
665 			READ_BUF(8);
666 			COPYMEM(open->op_verf.data, 8);
667 			status = nfsd4_decode_fattr(argp, open->op_bmval,
668 				&open->op_iattr, &open->op_acl);
669 			if (status)
670 				goto out;
671 			break;
672 		default:
673 			goto xdr_error;
674 		}
675 		break;
676 	default:
677 		goto xdr_error;
678 	}
679 
680 	/* open_claim */
681 	READ_BUF(4);
682 	READ32(open->op_claim_type);
683 	switch (open->op_claim_type) {
684 	case NFS4_OPEN_CLAIM_NULL:
685 	case NFS4_OPEN_CLAIM_DELEGATE_PREV:
686 		READ_BUF(4);
687 		READ32(open->op_fname.len);
688 		READ_BUF(open->op_fname.len);
689 		SAVEMEM(open->op_fname.data, open->op_fname.len);
690 		if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
691 			return status;
692 		break;
693 	case NFS4_OPEN_CLAIM_PREVIOUS:
694 		READ_BUF(4);
695 		READ32(open->op_delegate_type);
696 		break;
697 	case NFS4_OPEN_CLAIM_DELEGATE_CUR:
698 		status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
699 		if (status)
700 			return status;
701 		READ_BUF(4);
702 		READ32(open->op_fname.len);
703 		READ_BUF(open->op_fname.len);
704 		SAVEMEM(open->op_fname.data, open->op_fname.len);
705 		if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
706 			return status;
707 		break;
708 	default:
709 		goto xdr_error;
710 	}
711 
712 	DECODE_TAIL;
713 }
714 
715 static __be32
716 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
717 {
718 	DECODE_HEAD;
719 
720 	open_conf->oc_stateowner = NULL;
721 	status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
722 	if (status)
723 		return status;
724 	READ_BUF(4);
725 	READ32(open_conf->oc_seqid);
726 
727 	DECODE_TAIL;
728 }
729 
730 static __be32
731 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
732 {
733 	DECODE_HEAD;
734 
735 	open_down->od_stateowner = NULL;
736 	status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
737 	if (status)
738 		return status;
739 	READ_BUF(12);
740 	READ32(open_down->od_seqid);
741 	READ32(open_down->od_share_access);
742 	READ32(open_down->od_share_deny);
743 
744 	DECODE_TAIL;
745 }
746 
747 static __be32
748 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
749 {
750 	DECODE_HEAD;
751 
752 	READ_BUF(4);
753 	READ32(putfh->pf_fhlen);
754 	if (putfh->pf_fhlen > NFS4_FHSIZE)
755 		goto xdr_error;
756 	READ_BUF(putfh->pf_fhlen);
757 	SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
758 
759 	DECODE_TAIL;
760 }
761 
762 static __be32
763 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
764 {
765 	DECODE_HEAD;
766 
767 	status = nfsd4_decode_stateid(argp, &read->rd_stateid);
768 	if (status)
769 		return status;
770 	READ_BUF(12);
771 	READ64(read->rd_offset);
772 	READ32(read->rd_length);
773 
774 	DECODE_TAIL;
775 }
776 
777 static __be32
778 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
779 {
780 	DECODE_HEAD;
781 
782 	READ_BUF(24);
783 	READ64(readdir->rd_cookie);
784 	COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
785 	READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
786 	READ32(readdir->rd_maxcount);
787 	if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
788 		goto out;
789 
790 	DECODE_TAIL;
791 }
792 
793 static __be32
794 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
795 {
796 	DECODE_HEAD;
797 
798 	READ_BUF(4);
799 	READ32(remove->rm_namelen);
800 	READ_BUF(remove->rm_namelen);
801 	SAVEMEM(remove->rm_name, remove->rm_namelen);
802 	if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
803 		return status;
804 
805 	DECODE_TAIL;
806 }
807 
808 static __be32
809 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
810 {
811 	DECODE_HEAD;
812 
813 	READ_BUF(4);
814 	READ32(rename->rn_snamelen);
815 	READ_BUF(rename->rn_snamelen + 4);
816 	SAVEMEM(rename->rn_sname, rename->rn_snamelen);
817 	READ32(rename->rn_tnamelen);
818 	READ_BUF(rename->rn_tnamelen);
819 	SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
820 	if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
821 		return status;
822 	if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
823 		return status;
824 
825 	DECODE_TAIL;
826 }
827 
828 static __be32
829 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
830 {
831 	DECODE_HEAD;
832 
833 	READ_BUF(sizeof(clientid_t));
834 	COPYMEM(clientid, sizeof(clientid_t));
835 
836 	DECODE_TAIL;
837 }
838 
839 static __be32
840 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
841 		     struct nfsd4_secinfo *secinfo)
842 {
843 	DECODE_HEAD;
844 
845 	READ_BUF(4);
846 	READ32(secinfo->si_namelen);
847 	READ_BUF(secinfo->si_namelen);
848 	SAVEMEM(secinfo->si_name, secinfo->si_namelen);
849 	status = check_filename(secinfo->si_name, secinfo->si_namelen,
850 								nfserr_noent);
851 	if (status)
852 		return status;
853 	DECODE_TAIL;
854 }
855 
856 static __be32
857 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
858 {
859 	__be32 status;
860 
861 	status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
862 	if (status)
863 		return status;
864 	return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
865 				  &setattr->sa_acl);
866 }
867 
868 static __be32
869 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
870 {
871 	DECODE_HEAD;
872 
873 	READ_BUF(12);
874 	COPYMEM(setclientid->se_verf.data, 8);
875 	READ32(setclientid->se_namelen);
876 
877 	READ_BUF(setclientid->se_namelen + 8);
878 	SAVEMEM(setclientid->se_name, setclientid->se_namelen);
879 	READ32(setclientid->se_callback_prog);
880 	READ32(setclientid->se_callback_netid_len);
881 
882 	READ_BUF(setclientid->se_callback_netid_len + 4);
883 	SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
884 	READ32(setclientid->se_callback_addr_len);
885 
886 	READ_BUF(setclientid->se_callback_addr_len + 4);
887 	SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
888 	READ32(setclientid->se_callback_ident);
889 
890 	DECODE_TAIL;
891 }
892 
893 static __be32
894 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
895 {
896 	DECODE_HEAD;
897 
898 	READ_BUF(8 + sizeof(nfs4_verifier));
899 	COPYMEM(&scd_c->sc_clientid, 8);
900 	COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
901 
902 	DECODE_TAIL;
903 }
904 
905 /* Also used for NVERIFY */
906 static __be32
907 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
908 {
909 #if 0
910 	struct nfsd4_compoundargs save = {
911 		.p = argp->p,
912 		.end = argp->end,
913 		.rqstp = argp->rqstp,
914 	};
915 	u32             ve_bmval[2];
916 	struct iattr    ve_iattr;           /* request */
917 	struct nfs4_acl *ve_acl;            /* request */
918 #endif
919 	DECODE_HEAD;
920 
921 	if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
922 		goto out;
923 
924 	/* For convenience's sake, we compare raw xdr'd attributes in
925 	 * nfsd4_proc_verify; however we still decode here just to return
926 	 * correct error in case of bad xdr. */
927 #if 0
928 	status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
929 	if (status == nfserr_inval) {
930 		status = nfserrno(status);
931 		goto out;
932 	}
933 #endif
934 	READ_BUF(4);
935 	READ32(verify->ve_attrlen);
936 	READ_BUF(verify->ve_attrlen);
937 	SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
938 
939 	DECODE_TAIL;
940 }
941 
942 static __be32
943 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
944 {
945 	int avail;
946 	int v;
947 	int len;
948 	DECODE_HEAD;
949 
950 	status = nfsd4_decode_stateid(argp, &write->wr_stateid);
951 	if (status)
952 		return status;
953 	READ_BUF(16);
954 	READ64(write->wr_offset);
955 	READ32(write->wr_stable_how);
956 	if (write->wr_stable_how > 2)
957 		goto xdr_error;
958 	READ32(write->wr_buflen);
959 
960 	/* Sorry .. no magic macros for this.. *
961 	 * READ_BUF(write->wr_buflen);
962 	 * SAVEMEM(write->wr_buf, write->wr_buflen);
963 	 */
964 	avail = (char*)argp->end - (char*)argp->p;
965 	if (avail + argp->pagelen < write->wr_buflen) {
966 		dprintk("NFSD: xdr error (%s:%d)\n",
967 				__FILE__, __LINE__);
968 		goto xdr_error;
969 	}
970 	argp->rqstp->rq_vec[0].iov_base = p;
971 	argp->rqstp->rq_vec[0].iov_len = avail;
972 	v = 0;
973 	len = write->wr_buflen;
974 	while (len > argp->rqstp->rq_vec[v].iov_len) {
975 		len -= argp->rqstp->rq_vec[v].iov_len;
976 		v++;
977 		argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
978 		argp->pagelist++;
979 		if (argp->pagelen >= PAGE_SIZE) {
980 			argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
981 			argp->pagelen -= PAGE_SIZE;
982 		} else {
983 			argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
984 			argp->pagelen -= len;
985 		}
986 	}
987 	argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
988 	argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
989 	argp->rqstp->rq_vec[v].iov_len = len;
990 	write->wr_vlen = v+1;
991 
992 	DECODE_TAIL;
993 }
994 
995 static __be32
996 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
997 {
998 	DECODE_HEAD;
999 
1000 	READ_BUF(12);
1001 	COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1002 	READ32(rlockowner->rl_owner.len);
1003 	READ_BUF(rlockowner->rl_owner.len);
1004 	READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1005 
1006 	if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1007 		return nfserr_inval;
1008 	DECODE_TAIL;
1009 }
1010 
1011 static __be32
1012 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1013 			 struct nfsd4_exchange_id *exid)
1014 {
1015 	int dummy;
1016 	DECODE_HEAD;
1017 
1018 	READ_BUF(NFS4_VERIFIER_SIZE);
1019 	COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1020 
1021 	READ_BUF(4);
1022 	READ32(exid->clname.len);
1023 
1024 	READ_BUF(exid->clname.len);
1025 	SAVEMEM(exid->clname.data, exid->clname.len);
1026 
1027 	READ_BUF(4);
1028 	READ32(exid->flags);
1029 
1030 	/* Ignore state_protect4_a */
1031 	READ_BUF(4);
1032 	READ32(exid->spa_how);
1033 	switch (exid->spa_how) {
1034 	case SP4_NONE:
1035 		break;
1036 	case SP4_MACH_CRED:
1037 		/* spo_must_enforce */
1038 		READ_BUF(4);
1039 		READ32(dummy);
1040 		READ_BUF(dummy * 4);
1041 		p += dummy;
1042 
1043 		/* spo_must_allow */
1044 		READ_BUF(4);
1045 		READ32(dummy);
1046 		READ_BUF(dummy * 4);
1047 		p += dummy;
1048 		break;
1049 	case SP4_SSV:
1050 		/* ssp_ops */
1051 		READ_BUF(4);
1052 		READ32(dummy);
1053 		READ_BUF(dummy * 4);
1054 		p += dummy;
1055 
1056 		READ_BUF(4);
1057 		READ32(dummy);
1058 		READ_BUF(dummy * 4);
1059 		p += dummy;
1060 
1061 		/* ssp_hash_algs<> */
1062 		READ_BUF(4);
1063 		READ32(dummy);
1064 		READ_BUF(dummy);
1065 		p += XDR_QUADLEN(dummy);
1066 
1067 		/* ssp_encr_algs<> */
1068 		READ_BUF(4);
1069 		READ32(dummy);
1070 		READ_BUF(dummy);
1071 		p += XDR_QUADLEN(dummy);
1072 
1073 		/* ssp_window and ssp_num_gss_handles */
1074 		READ_BUF(8);
1075 		READ32(dummy);
1076 		READ32(dummy);
1077 		break;
1078 	default:
1079 		goto xdr_error;
1080 	}
1081 
1082 	/* Ignore Implementation ID */
1083 	READ_BUF(4);    /* nfs_impl_id4 array length */
1084 	READ32(dummy);
1085 
1086 	if (dummy > 1)
1087 		goto xdr_error;
1088 
1089 	if (dummy == 1) {
1090 		/* nii_domain */
1091 		READ_BUF(4);
1092 		READ32(dummy);
1093 		READ_BUF(dummy);
1094 		p += XDR_QUADLEN(dummy);
1095 
1096 		/* nii_name */
1097 		READ_BUF(4);
1098 		READ32(dummy);
1099 		READ_BUF(dummy);
1100 		p += XDR_QUADLEN(dummy);
1101 
1102 		/* nii_date */
1103 		READ_BUF(12);
1104 		p += 3;
1105 	}
1106 	DECODE_TAIL;
1107 }
1108 
1109 static __be32
1110 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1111 			    struct nfsd4_create_session *sess)
1112 {
1113 	DECODE_HEAD;
1114 
1115 	u32 dummy;
1116 	char *machine_name;
1117 	int i;
1118 	int nr_secflavs;
1119 
1120 	READ_BUF(16);
1121 	COPYMEM(&sess->clientid, 8);
1122 	READ32(sess->seqid);
1123 	READ32(sess->flags);
1124 
1125 	/* Fore channel attrs */
1126 	READ_BUF(28);
1127 	READ32(dummy); /* headerpadsz is always 0 */
1128 	READ32(sess->fore_channel.maxreq_sz);
1129 	READ32(sess->fore_channel.maxresp_sz);
1130 	READ32(sess->fore_channel.maxresp_cached);
1131 	READ32(sess->fore_channel.maxops);
1132 	READ32(sess->fore_channel.maxreqs);
1133 	READ32(sess->fore_channel.nr_rdma_attrs);
1134 	if (sess->fore_channel.nr_rdma_attrs == 1) {
1135 		READ_BUF(4);
1136 		READ32(sess->fore_channel.rdma_attrs);
1137 	} else if (sess->fore_channel.nr_rdma_attrs > 1) {
1138 		dprintk("Too many fore channel attr bitmaps!\n");
1139 		goto xdr_error;
1140 	}
1141 
1142 	/* Back channel attrs */
1143 	READ_BUF(28);
1144 	READ32(dummy); /* headerpadsz is always 0 */
1145 	READ32(sess->back_channel.maxreq_sz);
1146 	READ32(sess->back_channel.maxresp_sz);
1147 	READ32(sess->back_channel.maxresp_cached);
1148 	READ32(sess->back_channel.maxops);
1149 	READ32(sess->back_channel.maxreqs);
1150 	READ32(sess->back_channel.nr_rdma_attrs);
1151 	if (sess->back_channel.nr_rdma_attrs == 1) {
1152 		READ_BUF(4);
1153 		READ32(sess->back_channel.rdma_attrs);
1154 	} else if (sess->back_channel.nr_rdma_attrs > 1) {
1155 		dprintk("Too many back channel attr bitmaps!\n");
1156 		goto xdr_error;
1157 	}
1158 
1159 	READ_BUF(8);
1160 	READ32(sess->callback_prog);
1161 
1162 	/* callback_sec_params4 */
1163 	READ32(nr_secflavs);
1164 	for (i = 0; i < nr_secflavs; ++i) {
1165 		READ_BUF(4);
1166 		READ32(dummy);
1167 		switch (dummy) {
1168 		case RPC_AUTH_NULL:
1169 			/* Nothing to read */
1170 			break;
1171 		case RPC_AUTH_UNIX:
1172 			READ_BUF(8);
1173 			/* stamp */
1174 			READ32(dummy);
1175 
1176 			/* machine name */
1177 			READ32(dummy);
1178 			READ_BUF(dummy);
1179 			SAVEMEM(machine_name, dummy);
1180 
1181 			/* uid, gid */
1182 			READ_BUF(8);
1183 			READ32(sess->uid);
1184 			READ32(sess->gid);
1185 
1186 			/* more gids */
1187 			READ_BUF(4);
1188 			READ32(dummy);
1189 			READ_BUF(dummy * 4);
1190 			for (i = 0; i < dummy; ++i)
1191 				READ32(dummy);
1192 			break;
1193 		case RPC_AUTH_GSS:
1194 			dprintk("RPC_AUTH_GSS callback secflavor "
1195 				"not supported!\n");
1196 			READ_BUF(8);
1197 			/* gcbp_service */
1198 			READ32(dummy);
1199 			/* gcbp_handle_from_server */
1200 			READ32(dummy);
1201 			READ_BUF(dummy);
1202 			p += XDR_QUADLEN(dummy);
1203 			/* gcbp_handle_from_client */
1204 			READ_BUF(4);
1205 			READ32(dummy);
1206 			READ_BUF(dummy);
1207 			p += XDR_QUADLEN(dummy);
1208 			break;
1209 		default:
1210 			dprintk("Illegal callback secflavor\n");
1211 			return nfserr_inval;
1212 		}
1213 	}
1214 	DECODE_TAIL;
1215 }
1216 
1217 static __be32
1218 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1219 			     struct nfsd4_destroy_session *destroy_session)
1220 {
1221 	DECODE_HEAD;
1222 	READ_BUF(NFS4_MAX_SESSIONID_LEN);
1223 	COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1224 
1225 	DECODE_TAIL;
1226 }
1227 
1228 static __be32
1229 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1230 		      struct nfsd4_sequence *seq)
1231 {
1232 	DECODE_HEAD;
1233 
1234 	READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1235 	COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1236 	READ32(seq->seqid);
1237 	READ32(seq->slotid);
1238 	READ32(seq->maxslots);
1239 	READ32(seq->cachethis);
1240 
1241 	DECODE_TAIL;
1242 }
1243 
1244 static __be32
1245 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1246 {
1247 	return nfs_ok;
1248 }
1249 
1250 static __be32
1251 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1252 {
1253 	return nfserr_notsupp;
1254 }
1255 
1256 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1257 
1258 static nfsd4_dec nfsd4_dec_ops[] = {
1259 	[OP_ACCESS]		= (nfsd4_dec)nfsd4_decode_access,
1260 	[OP_CLOSE]		= (nfsd4_dec)nfsd4_decode_close,
1261 	[OP_COMMIT]		= (nfsd4_dec)nfsd4_decode_commit,
1262 	[OP_CREATE]		= (nfsd4_dec)nfsd4_decode_create,
1263 	[OP_DELEGPURGE]		= (nfsd4_dec)nfsd4_decode_notsupp,
1264 	[OP_DELEGRETURN]	= (nfsd4_dec)nfsd4_decode_delegreturn,
1265 	[OP_GETATTR]		= (nfsd4_dec)nfsd4_decode_getattr,
1266 	[OP_GETFH]		= (nfsd4_dec)nfsd4_decode_noop,
1267 	[OP_LINK]		= (nfsd4_dec)nfsd4_decode_link,
1268 	[OP_LOCK]		= (nfsd4_dec)nfsd4_decode_lock,
1269 	[OP_LOCKT]		= (nfsd4_dec)nfsd4_decode_lockt,
1270 	[OP_LOCKU]		= (nfsd4_dec)nfsd4_decode_locku,
1271 	[OP_LOOKUP]		= (nfsd4_dec)nfsd4_decode_lookup,
1272 	[OP_LOOKUPP]		= (nfsd4_dec)nfsd4_decode_noop,
1273 	[OP_NVERIFY]		= (nfsd4_dec)nfsd4_decode_verify,
1274 	[OP_OPEN]		= (nfsd4_dec)nfsd4_decode_open,
1275 	[OP_OPENATTR]		= (nfsd4_dec)nfsd4_decode_notsupp,
1276 	[OP_OPEN_CONFIRM]	= (nfsd4_dec)nfsd4_decode_open_confirm,
1277 	[OP_OPEN_DOWNGRADE]	= (nfsd4_dec)nfsd4_decode_open_downgrade,
1278 	[OP_PUTFH]		= (nfsd4_dec)nfsd4_decode_putfh,
1279 	[OP_PUTPUBFH]		= (nfsd4_dec)nfsd4_decode_noop,
1280 	[OP_PUTROOTFH]		= (nfsd4_dec)nfsd4_decode_noop,
1281 	[OP_READ]		= (nfsd4_dec)nfsd4_decode_read,
1282 	[OP_READDIR]		= (nfsd4_dec)nfsd4_decode_readdir,
1283 	[OP_READLINK]		= (nfsd4_dec)nfsd4_decode_noop,
1284 	[OP_REMOVE]		= (nfsd4_dec)nfsd4_decode_remove,
1285 	[OP_RENAME]		= (nfsd4_dec)nfsd4_decode_rename,
1286 	[OP_RENEW]		= (nfsd4_dec)nfsd4_decode_renew,
1287 	[OP_RESTOREFH]		= (nfsd4_dec)nfsd4_decode_noop,
1288 	[OP_SAVEFH]		= (nfsd4_dec)nfsd4_decode_noop,
1289 	[OP_SECINFO]		= (nfsd4_dec)nfsd4_decode_secinfo,
1290 	[OP_SETATTR]		= (nfsd4_dec)nfsd4_decode_setattr,
1291 	[OP_SETCLIENTID]	= (nfsd4_dec)nfsd4_decode_setclientid,
1292 	[OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1293 	[OP_VERIFY]		= (nfsd4_dec)nfsd4_decode_verify,
1294 	[OP_WRITE]		= (nfsd4_dec)nfsd4_decode_write,
1295 	[OP_RELEASE_LOCKOWNER]	= (nfsd4_dec)nfsd4_decode_release_lockowner,
1296 };
1297 
1298 static nfsd4_dec nfsd41_dec_ops[] = {
1299 	[OP_ACCESS]		= (nfsd4_dec)nfsd4_decode_access,
1300 	[OP_CLOSE]		= (nfsd4_dec)nfsd4_decode_close,
1301 	[OP_COMMIT]		= (nfsd4_dec)nfsd4_decode_commit,
1302 	[OP_CREATE]		= (nfsd4_dec)nfsd4_decode_create,
1303 	[OP_DELEGPURGE]		= (nfsd4_dec)nfsd4_decode_notsupp,
1304 	[OP_DELEGRETURN]	= (nfsd4_dec)nfsd4_decode_delegreturn,
1305 	[OP_GETATTR]		= (nfsd4_dec)nfsd4_decode_getattr,
1306 	[OP_GETFH]		= (nfsd4_dec)nfsd4_decode_noop,
1307 	[OP_LINK]		= (nfsd4_dec)nfsd4_decode_link,
1308 	[OP_LOCK]		= (nfsd4_dec)nfsd4_decode_lock,
1309 	[OP_LOCKT]		= (nfsd4_dec)nfsd4_decode_lockt,
1310 	[OP_LOCKU]		= (nfsd4_dec)nfsd4_decode_locku,
1311 	[OP_LOOKUP]		= (nfsd4_dec)nfsd4_decode_lookup,
1312 	[OP_LOOKUPP]		= (nfsd4_dec)nfsd4_decode_noop,
1313 	[OP_NVERIFY]		= (nfsd4_dec)nfsd4_decode_verify,
1314 	[OP_OPEN]		= (nfsd4_dec)nfsd4_decode_open,
1315 	[OP_OPENATTR]		= (nfsd4_dec)nfsd4_decode_notsupp,
1316 	[OP_OPEN_CONFIRM]	= (nfsd4_dec)nfsd4_decode_notsupp,
1317 	[OP_OPEN_DOWNGRADE]	= (nfsd4_dec)nfsd4_decode_open_downgrade,
1318 	[OP_PUTFH]		= (nfsd4_dec)nfsd4_decode_putfh,
1319 	[OP_PUTPUBFH]		= (nfsd4_dec)nfsd4_decode_notsupp,
1320 	[OP_PUTROOTFH]		= (nfsd4_dec)nfsd4_decode_noop,
1321 	[OP_READ]		= (nfsd4_dec)nfsd4_decode_read,
1322 	[OP_READDIR]		= (nfsd4_dec)nfsd4_decode_readdir,
1323 	[OP_READLINK]		= (nfsd4_dec)nfsd4_decode_noop,
1324 	[OP_REMOVE]		= (nfsd4_dec)nfsd4_decode_remove,
1325 	[OP_RENAME]		= (nfsd4_dec)nfsd4_decode_rename,
1326 	[OP_RENEW]		= (nfsd4_dec)nfsd4_decode_notsupp,
1327 	[OP_RESTOREFH]		= (nfsd4_dec)nfsd4_decode_noop,
1328 	[OP_SAVEFH]		= (nfsd4_dec)nfsd4_decode_noop,
1329 	[OP_SECINFO]		= (nfsd4_dec)nfsd4_decode_secinfo,
1330 	[OP_SETATTR]		= (nfsd4_dec)nfsd4_decode_setattr,
1331 	[OP_SETCLIENTID]	= (nfsd4_dec)nfsd4_decode_notsupp,
1332 	[OP_SETCLIENTID_CONFIRM]= (nfsd4_dec)nfsd4_decode_notsupp,
1333 	[OP_VERIFY]		= (nfsd4_dec)nfsd4_decode_verify,
1334 	[OP_WRITE]		= (nfsd4_dec)nfsd4_decode_write,
1335 	[OP_RELEASE_LOCKOWNER]	= (nfsd4_dec)nfsd4_decode_notsupp,
1336 
1337 	/* new operations for NFSv4.1 */
1338 	[OP_BACKCHANNEL_CTL]	= (nfsd4_dec)nfsd4_decode_notsupp,
1339 	[OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_notsupp,
1340 	[OP_EXCHANGE_ID]	= (nfsd4_dec)nfsd4_decode_exchange_id,
1341 	[OP_CREATE_SESSION]	= (nfsd4_dec)nfsd4_decode_create_session,
1342 	[OP_DESTROY_SESSION]	= (nfsd4_dec)nfsd4_decode_destroy_session,
1343 	[OP_FREE_STATEID]	= (nfsd4_dec)nfsd4_decode_notsupp,
1344 	[OP_GET_DIR_DELEGATION]	= (nfsd4_dec)nfsd4_decode_notsupp,
1345 	[OP_GETDEVICEINFO]	= (nfsd4_dec)nfsd4_decode_notsupp,
1346 	[OP_GETDEVICELIST]	= (nfsd4_dec)nfsd4_decode_notsupp,
1347 	[OP_LAYOUTCOMMIT]	= (nfsd4_dec)nfsd4_decode_notsupp,
1348 	[OP_LAYOUTGET]		= (nfsd4_dec)nfsd4_decode_notsupp,
1349 	[OP_LAYOUTRETURN]	= (nfsd4_dec)nfsd4_decode_notsupp,
1350 	[OP_SECINFO_NO_NAME]	= (nfsd4_dec)nfsd4_decode_notsupp,
1351 	[OP_SEQUENCE]		= (nfsd4_dec)nfsd4_decode_sequence,
1352 	[OP_SET_SSV]		= (nfsd4_dec)nfsd4_decode_notsupp,
1353 	[OP_TEST_STATEID]	= (nfsd4_dec)nfsd4_decode_notsupp,
1354 	[OP_WANT_DELEGATION]	= (nfsd4_dec)nfsd4_decode_notsupp,
1355 	[OP_DESTROY_CLIENTID]	= (nfsd4_dec)nfsd4_decode_notsupp,
1356 	[OP_RECLAIM_COMPLETE]	= (nfsd4_dec)nfsd4_decode_notsupp,
1357 };
1358 
1359 struct nfsd4_minorversion_ops {
1360 	nfsd4_dec *decoders;
1361 	int nops;
1362 };
1363 
1364 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1365 	[0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1366 	[1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1367 };
1368 
1369 static __be32
1370 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1371 {
1372 	DECODE_HEAD;
1373 	struct nfsd4_op *op;
1374 	struct nfsd4_minorversion_ops *ops;
1375 	int i;
1376 
1377 	/*
1378 	 * XXX: According to spec, we should check the tag
1379 	 * for UTF-8 compliance.  I'm postponing this for
1380 	 * now because it seems that some clients do use
1381 	 * binary tags.
1382 	 */
1383 	READ_BUF(4);
1384 	READ32(argp->taglen);
1385 	READ_BUF(argp->taglen + 8);
1386 	SAVEMEM(argp->tag, argp->taglen);
1387 	READ32(argp->minorversion);
1388 	READ32(argp->opcnt);
1389 
1390 	if (argp->taglen > NFSD4_MAX_TAGLEN)
1391 		goto xdr_error;
1392 	if (argp->opcnt > 100)
1393 		goto xdr_error;
1394 
1395 	if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1396 		argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1397 		if (!argp->ops) {
1398 			argp->ops = argp->iops;
1399 			dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1400 			goto xdr_error;
1401 		}
1402 	}
1403 
1404 	if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1405 		argp->opcnt = 0;
1406 
1407 	ops = &nfsd4_minorversion[argp->minorversion];
1408 	for (i = 0; i < argp->opcnt; i++) {
1409 		op = &argp->ops[i];
1410 		op->replay = NULL;
1411 
1412 		/*
1413 		 * We can't use READ_BUF() here because we need to handle
1414 		 * a missing opcode as an OP_WRITE + 1. So we need to check
1415 		 * to see if we're truly at the end of our buffer or if there
1416 		 * is another page we need to flip to.
1417 		 */
1418 
1419 		if (argp->p == argp->end) {
1420 			if (argp->pagelen < 4) {
1421 				/* There isn't an opcode still on the wire */
1422 				op->opnum = OP_WRITE + 1;
1423 				op->status = nfserr_bad_xdr;
1424 				argp->opcnt = i+1;
1425 				break;
1426 			}
1427 
1428 			/*
1429 			 * False alarm. We just hit a page boundary, but there
1430 			 * is still data available.  Move pointer across page
1431 			 * boundary.  *snip from READ_BUF*
1432 			 */
1433 			argp->p = page_address(argp->pagelist[0]);
1434 			argp->pagelist++;
1435 			if (argp->pagelen < PAGE_SIZE) {
1436 				argp->end = p + (argp->pagelen>>2);
1437 				argp->pagelen = 0;
1438 			} else {
1439 				argp->end = p + (PAGE_SIZE>>2);
1440 				argp->pagelen -= PAGE_SIZE;
1441 			}
1442 		}
1443 		op->opnum = ntohl(*argp->p++);
1444 
1445 		if (op->opnum >= OP_ACCESS && op->opnum < ops->nops)
1446 			op->status = ops->decoders[op->opnum](argp, &op->u);
1447 		else {
1448 			op->opnum = OP_ILLEGAL;
1449 			op->status = nfserr_op_illegal;
1450 		}
1451 
1452 		if (op->status) {
1453 			argp->opcnt = i+1;
1454 			break;
1455 		}
1456 	}
1457 
1458 	DECODE_TAIL;
1459 }
1460 
1461 #define WRITE32(n)               *p++ = htonl(n)
1462 #define WRITE64(n)               do {				\
1463 	*p++ = htonl((u32)((n) >> 32));				\
1464 	*p++ = htonl((u32)(n));					\
1465 } while (0)
1466 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {		\
1467 	*(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1468 	memcpy(p, ptr, nbytes);					\
1469 	p += XDR_QUADLEN(nbytes);				\
1470 }} while (0)
1471 
1472 static void write32(__be32 **p, u32 n)
1473 {
1474 	*(*p)++ = n;
1475 }
1476 
1477 static void write64(__be32 **p, u64 n)
1478 {
1479 	write32(p, (u32)(n >> 32));
1480 	write32(p, (u32)n);
1481 }
1482 
1483 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1484 {
1485 	if (IS_I_VERSION(inode)) {
1486 		write64(p, inode->i_version);
1487 	} else {
1488 		write32(p, stat->ctime.tv_sec);
1489 		write32(p, stat->ctime.tv_nsec);
1490 	}
1491 }
1492 
1493 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1494 {
1495 	write32(p, c->atomic);
1496 	if (c->change_supported) {
1497 		write64(p, c->before_change);
1498 		write64(p, c->after_change);
1499 	} else {
1500 		write32(p, c->before_ctime_sec);
1501 		write32(p, c->before_ctime_nsec);
1502 		write32(p, c->after_ctime_sec);
1503 		write32(p, c->after_ctime_nsec);
1504 	}
1505 }
1506 
1507 #define RESERVE_SPACE(nbytes)	do {				\
1508 	p = resp->p;						\
1509 	BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);		\
1510 } while (0)
1511 #define ADJUST_ARGS()		resp->p = p
1512 
1513 /*
1514  * Header routine to setup seqid operation replay cache
1515  */
1516 #define ENCODE_SEQID_OP_HEAD					\
1517 	__be32 *save;						\
1518 								\
1519 	save = resp->p;
1520 
1521 /*
1522  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1523  * is where sequence id's are incremented, and the replay cache is filled.
1524  * Note that we increment sequence id's here, at the last moment, so we're sure
1525  * we know whether the error to be returned is a sequence id mutating error.
1526  */
1527 
1528 #define ENCODE_SEQID_OP_TAIL(stateowner) do {			\
1529 	if (seqid_mutating_err(nfserr) && stateowner) { 	\
1530 		stateowner->so_seqid++;				\
1531 		stateowner->so_replay.rp_status = nfserr;   	\
1532 		stateowner->so_replay.rp_buflen = 		\
1533 			  (((char *)(resp)->p - (char *)save)); \
1534 		memcpy(stateowner->so_replay.rp_buf, save,      \
1535  			stateowner->so_replay.rp_buflen); 	\
1536 	} } while (0);
1537 
1538 /* Encode as an array of strings the string given with components
1539  * seperated @sep.
1540  */
1541 static __be32 nfsd4_encode_components(char sep, char *components,
1542 				   __be32 **pp, int *buflen)
1543 {
1544 	__be32 *p = *pp;
1545 	__be32 *countp = p;
1546 	int strlen, count=0;
1547 	char *str, *end;
1548 
1549 	dprintk("nfsd4_encode_components(%s)\n", components);
1550 	if ((*buflen -= 4) < 0)
1551 		return nfserr_resource;
1552 	WRITE32(0); /* We will fill this in with @count later */
1553 	end = str = components;
1554 	while (*end) {
1555 		for (; *end && (*end != sep); end++)
1556 			; /* Point to end of component */
1557 		strlen = end - str;
1558 		if (strlen) {
1559 			if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1560 				return nfserr_resource;
1561 			WRITE32(strlen);
1562 			WRITEMEM(str, strlen);
1563 			count++;
1564 		}
1565 		else
1566 			end++;
1567 		str = end;
1568 	}
1569 	*pp = p;
1570 	p = countp;
1571 	WRITE32(count);
1572 	return 0;
1573 }
1574 
1575 /*
1576  * encode a location element of a fs_locations structure
1577  */
1578 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1579 				    __be32 **pp, int *buflen)
1580 {
1581 	__be32 status;
1582 	__be32 *p = *pp;
1583 
1584 	status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1585 	if (status)
1586 		return status;
1587 	status = nfsd4_encode_components('/', location->path, &p, buflen);
1588 	if (status)
1589 		return status;
1590 	*pp = p;
1591 	return 0;
1592 }
1593 
1594 /*
1595  * Return the path to an export point in the pseudo filesystem namespace
1596  * Returned string is safe to use as long as the caller holds a reference
1597  * to @exp.
1598  */
1599 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1600 {
1601 	struct svc_fh tmp_fh;
1602 	char *path, *rootpath;
1603 
1604 	fh_init(&tmp_fh, NFS4_FHSIZE);
1605 	*stat = exp_pseudoroot(rqstp, &tmp_fh);
1606 	if (*stat)
1607 		return NULL;
1608 	rootpath = tmp_fh.fh_export->ex_pathname;
1609 
1610 	path = exp->ex_pathname;
1611 
1612 	if (strncmp(path, rootpath, strlen(rootpath))) {
1613 		dprintk("nfsd: fs_locations failed;"
1614 			"%s is not contained in %s\n", path, rootpath);
1615 		*stat = nfserr_notsupp;
1616 		return NULL;
1617 	}
1618 
1619 	return path + strlen(rootpath);
1620 }
1621 
1622 /*
1623  *  encode a fs_locations structure
1624  */
1625 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1626 				     struct svc_export *exp,
1627 				     __be32 **pp, int *buflen)
1628 {
1629 	__be32 status;
1630 	int i;
1631 	__be32 *p = *pp;
1632 	struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1633 	char *root = nfsd4_path(rqstp, exp, &status);
1634 
1635 	if (status)
1636 		return status;
1637 	status = nfsd4_encode_components('/', root, &p, buflen);
1638 	if (status)
1639 		return status;
1640 	if ((*buflen -= 4) < 0)
1641 		return nfserr_resource;
1642 	WRITE32(fslocs->locations_count);
1643 	for (i=0; i<fslocs->locations_count; i++) {
1644 		status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1645 						   &p, buflen);
1646 		if (status)
1647 			return status;
1648 	}
1649 	*pp = p;
1650 	return 0;
1651 }
1652 
1653 static u32 nfs4_ftypes[16] = {
1654         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1655         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1656         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1657         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1658 };
1659 
1660 static __be32
1661 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1662 			__be32 **p, int *buflen)
1663 {
1664 	int status;
1665 
1666 	if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1667 		return nfserr_resource;
1668 	if (whotype != NFS4_ACL_WHO_NAMED)
1669 		status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1670 	else if (group)
1671 		status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1672 	else
1673 		status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1674 	if (status < 0)
1675 		return nfserrno(status);
1676 	*p = xdr_encode_opaque(*p, NULL, status);
1677 	*buflen -= (XDR_QUADLEN(status) << 2) + 4;
1678 	BUG_ON(*buflen < 0);
1679 	return 0;
1680 }
1681 
1682 static inline __be32
1683 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1684 {
1685 	return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1686 }
1687 
1688 static inline __be32
1689 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1690 {
1691 	return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1692 }
1693 
1694 static inline __be32
1695 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1696 		__be32 **p, int *buflen)
1697 {
1698 	return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1699 }
1700 
1701 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1702 			      FATTR4_WORD0_RDATTR_ERROR)
1703 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1704 
1705 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1706 {
1707 	/* As per referral draft:  */
1708 	if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1709 	    *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1710 		if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1711 	            *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1712 			*rdattr_err = NFSERR_MOVED;
1713 		else
1714 			return nfserr_moved;
1715 	}
1716 	*bmval0 &= WORD0_ABSENT_FS_ATTRS;
1717 	*bmval1 &= WORD1_ABSENT_FS_ATTRS;
1718 	return 0;
1719 }
1720 
1721 /*
1722  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1723  * ourselves.
1724  *
1725  * @countp is the buffer size in _words_; upon successful return this becomes
1726  * replaced with the number of words written.
1727  */
1728 __be32
1729 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1730 		struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1731 		struct svc_rqst *rqstp, int ignore_crossmnt)
1732 {
1733 	u32 bmval0 = bmval[0];
1734 	u32 bmval1 = bmval[1];
1735 	u32 bmval2 = bmval[2];
1736 	struct kstat stat;
1737 	struct svc_fh tempfh;
1738 	struct kstatfs statfs;
1739 	int buflen = *countp << 2;
1740 	__be32 *attrlenp;
1741 	u32 dummy;
1742 	u64 dummy64;
1743 	u32 rdattr_err = 0;
1744 	__be32 *p = buffer;
1745 	__be32 status;
1746 	int err;
1747 	int aclsupport = 0;
1748 	struct nfs4_acl *acl = NULL;
1749 	struct nfsd4_compoundres *resp = rqstp->rq_resp;
1750 	u32 minorversion = resp->cstate.minorversion;
1751 
1752 	BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1753 	BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
1754 	BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
1755 	BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
1756 
1757 	if (exp->ex_fslocs.migrated) {
1758 		BUG_ON(bmval[2]);
1759 		status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1760 		if (status)
1761 			goto out;
1762 	}
1763 
1764 	err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
1765 	if (err)
1766 		goto out_nfserr;
1767 	if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
1768 			FATTR4_WORD0_MAXNAME)) ||
1769 	    (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1770 		       FATTR4_WORD1_SPACE_TOTAL))) {
1771 		err = vfs_statfs(dentry, &statfs);
1772 		if (err)
1773 			goto out_nfserr;
1774 	}
1775 	if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1776 		fh_init(&tempfh, NFS4_FHSIZE);
1777 		status = fh_compose(&tempfh, exp, dentry, NULL);
1778 		if (status)
1779 			goto out;
1780 		fhp = &tempfh;
1781 	}
1782 	if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1783 			| FATTR4_WORD0_SUPPORTED_ATTRS)) {
1784 		err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1785 		aclsupport = (err == 0);
1786 		if (bmval0 & FATTR4_WORD0_ACL) {
1787 			if (err == -EOPNOTSUPP)
1788 				bmval0 &= ~FATTR4_WORD0_ACL;
1789 			else if (err == -EINVAL) {
1790 				status = nfserr_attrnotsupp;
1791 				goto out;
1792 			} else if (err != 0)
1793 				goto out_nfserr;
1794 		}
1795 	}
1796 	if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1797 		if (exp->ex_fslocs.locations == NULL) {
1798 			bmval0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1799 		}
1800 	}
1801 	if ((buflen -= 16) < 0)
1802 		goto out_resource;
1803 
1804 	if (unlikely(bmval2)) {
1805 		WRITE32(3);
1806 		WRITE32(bmval0);
1807 		WRITE32(bmval1);
1808 		WRITE32(bmval2);
1809 	} else if (likely(bmval1)) {
1810 		WRITE32(2);
1811 		WRITE32(bmval0);
1812 		WRITE32(bmval1);
1813 	} else {
1814 		WRITE32(1);
1815 		WRITE32(bmval0);
1816 	}
1817 	attrlenp = p++;                /* to be backfilled later */
1818 
1819 	if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1820 		u32 word0 = nfsd_suppattrs0(minorversion);
1821 		u32 word1 = nfsd_suppattrs1(minorversion);
1822 		u32 word2 = nfsd_suppattrs2(minorversion);
1823 
1824 		if ((buflen -= 12) < 0)
1825 			goto out_resource;
1826 		if (!aclsupport)
1827 			word0 &= ~FATTR4_WORD0_ACL;
1828 		if (!exp->ex_fslocs.locations)
1829 			word0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1830 		if (!word2) {
1831 			WRITE32(2);
1832 			WRITE32(word0);
1833 			WRITE32(word1);
1834 		} else {
1835 			WRITE32(3);
1836 			WRITE32(word0);
1837 			WRITE32(word1);
1838 			WRITE32(word2);
1839 		}
1840 	}
1841 	if (bmval0 & FATTR4_WORD0_TYPE) {
1842 		if ((buflen -= 4) < 0)
1843 			goto out_resource;
1844 		dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1845 		if (dummy == NF4BAD)
1846 			goto out_serverfault;
1847 		WRITE32(dummy);
1848 	}
1849 	if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1850 		if ((buflen -= 4) < 0)
1851 			goto out_resource;
1852 		if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1853 			WRITE32(NFS4_FH_PERSISTENT);
1854 		else
1855 			WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1856 	}
1857 	if (bmval0 & FATTR4_WORD0_CHANGE) {
1858 		if ((buflen -= 8) < 0)
1859 			goto out_resource;
1860 		write_change(&p, &stat, dentry->d_inode);
1861 	}
1862 	if (bmval0 & FATTR4_WORD0_SIZE) {
1863 		if ((buflen -= 8) < 0)
1864 			goto out_resource;
1865 		WRITE64(stat.size);
1866 	}
1867 	if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1868 		if ((buflen -= 4) < 0)
1869 			goto out_resource;
1870 		WRITE32(1);
1871 	}
1872 	if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1873 		if ((buflen -= 4) < 0)
1874 			goto out_resource;
1875 		WRITE32(1);
1876 	}
1877 	if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1878 		if ((buflen -= 4) < 0)
1879 			goto out_resource;
1880 		WRITE32(0);
1881 	}
1882 	if (bmval0 & FATTR4_WORD0_FSID) {
1883 		if ((buflen -= 16) < 0)
1884 			goto out_resource;
1885 		if (exp->ex_fslocs.migrated) {
1886 			WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1887 			WRITE64(NFS4_REFERRAL_FSID_MINOR);
1888 		} else switch(fsid_source(fhp)) {
1889 		case FSIDSOURCE_FSID:
1890 			WRITE64((u64)exp->ex_fsid);
1891 			WRITE64((u64)0);
1892 			break;
1893 		case FSIDSOURCE_DEV:
1894 			WRITE32(0);
1895 			WRITE32(MAJOR(stat.dev));
1896 			WRITE32(0);
1897 			WRITE32(MINOR(stat.dev));
1898 			break;
1899 		case FSIDSOURCE_UUID:
1900 			WRITEMEM(exp->ex_uuid, 16);
1901 			break;
1902 		}
1903 	}
1904 	if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1905 		if ((buflen -= 4) < 0)
1906 			goto out_resource;
1907 		WRITE32(0);
1908 	}
1909 	if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1910 		if ((buflen -= 4) < 0)
1911 			goto out_resource;
1912 		WRITE32(NFSD_LEASE_TIME);
1913 	}
1914 	if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1915 		if ((buflen -= 4) < 0)
1916 			goto out_resource;
1917 		WRITE32(rdattr_err);
1918 	}
1919 	if (bmval0 & FATTR4_WORD0_ACL) {
1920 		struct nfs4_ace *ace;
1921 
1922 		if (acl == NULL) {
1923 			if ((buflen -= 4) < 0)
1924 				goto out_resource;
1925 
1926 			WRITE32(0);
1927 			goto out_acl;
1928 		}
1929 		if ((buflen -= 4) < 0)
1930 			goto out_resource;
1931 		WRITE32(acl->naces);
1932 
1933 		for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1934 			if ((buflen -= 4*3) < 0)
1935 				goto out_resource;
1936 			WRITE32(ace->type);
1937 			WRITE32(ace->flag);
1938 			WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1939 			status = nfsd4_encode_aclname(rqstp, ace->whotype,
1940 				ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1941 				&p, &buflen);
1942 			if (status == nfserr_resource)
1943 				goto out_resource;
1944 			if (status)
1945 				goto out;
1946 		}
1947 	}
1948 out_acl:
1949 	if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1950 		if ((buflen -= 4) < 0)
1951 			goto out_resource;
1952 		WRITE32(aclsupport ?
1953 			ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1954 	}
1955 	if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1956 		if ((buflen -= 4) < 0)
1957 			goto out_resource;
1958 		WRITE32(1);
1959 	}
1960 	if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1961 		if ((buflen -= 4) < 0)
1962 			goto out_resource;
1963 		WRITE32(1);
1964 	}
1965 	if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1966 		if ((buflen -= 4) < 0)
1967 			goto out_resource;
1968 		WRITE32(1);
1969 	}
1970 	if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1971 		if ((buflen -= 4) < 0)
1972 			goto out_resource;
1973 		WRITE32(1);
1974 	}
1975 	if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1976 		buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1977 		if (buflen < 0)
1978 			goto out_resource;
1979 		WRITE32(fhp->fh_handle.fh_size);
1980 		WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1981 	}
1982 	if (bmval0 & FATTR4_WORD0_FILEID) {
1983 		if ((buflen -= 8) < 0)
1984 			goto out_resource;
1985 		WRITE64(stat.ino);
1986 	}
1987 	if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1988 		if ((buflen -= 8) < 0)
1989 			goto out_resource;
1990 		WRITE64((u64) statfs.f_ffree);
1991 	}
1992 	if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1993 		if ((buflen -= 8) < 0)
1994 			goto out_resource;
1995 		WRITE64((u64) statfs.f_ffree);
1996 	}
1997 	if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1998 		if ((buflen -= 8) < 0)
1999 			goto out_resource;
2000 		WRITE64((u64) statfs.f_files);
2001 	}
2002 	if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2003 		status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2004 		if (status == nfserr_resource)
2005 			goto out_resource;
2006 		if (status)
2007 			goto out;
2008 	}
2009 	if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2010 		if ((buflen -= 4) < 0)
2011 			goto out_resource;
2012 		WRITE32(1);
2013 	}
2014 	if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2015 		if ((buflen -= 8) < 0)
2016 			goto out_resource;
2017 		WRITE64(~(u64)0);
2018 	}
2019 	if (bmval0 & FATTR4_WORD0_MAXLINK) {
2020 		if ((buflen -= 4) < 0)
2021 			goto out_resource;
2022 		WRITE32(255);
2023 	}
2024 	if (bmval0 & FATTR4_WORD0_MAXNAME) {
2025 		if ((buflen -= 4) < 0)
2026 			goto out_resource;
2027 		WRITE32(statfs.f_namelen);
2028 	}
2029 	if (bmval0 & FATTR4_WORD0_MAXREAD) {
2030 		if ((buflen -= 8) < 0)
2031 			goto out_resource;
2032 		WRITE64((u64) svc_max_payload(rqstp));
2033 	}
2034 	if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2035 		if ((buflen -= 8) < 0)
2036 			goto out_resource;
2037 		WRITE64((u64) svc_max_payload(rqstp));
2038 	}
2039 	if (bmval1 & FATTR4_WORD1_MODE) {
2040 		if ((buflen -= 4) < 0)
2041 			goto out_resource;
2042 		WRITE32(stat.mode & S_IALLUGO);
2043 	}
2044 	if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2045 		if ((buflen -= 4) < 0)
2046 			goto out_resource;
2047 		WRITE32(1);
2048 	}
2049 	if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2050 		if ((buflen -= 4) < 0)
2051 			goto out_resource;
2052 		WRITE32(stat.nlink);
2053 	}
2054 	if (bmval1 & FATTR4_WORD1_OWNER) {
2055 		status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2056 		if (status == nfserr_resource)
2057 			goto out_resource;
2058 		if (status)
2059 			goto out;
2060 	}
2061 	if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2062 		status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2063 		if (status == nfserr_resource)
2064 			goto out_resource;
2065 		if (status)
2066 			goto out;
2067 	}
2068 	if (bmval1 & FATTR4_WORD1_RAWDEV) {
2069 		if ((buflen -= 8) < 0)
2070 			goto out_resource;
2071 		WRITE32((u32) MAJOR(stat.rdev));
2072 		WRITE32((u32) MINOR(stat.rdev));
2073 	}
2074 	if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2075 		if ((buflen -= 8) < 0)
2076 			goto out_resource;
2077 		dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2078 		WRITE64(dummy64);
2079 	}
2080 	if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2081 		if ((buflen -= 8) < 0)
2082 			goto out_resource;
2083 		dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2084 		WRITE64(dummy64);
2085 	}
2086 	if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2087 		if ((buflen -= 8) < 0)
2088 			goto out_resource;
2089 		dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2090 		WRITE64(dummy64);
2091 	}
2092 	if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2093 		if ((buflen -= 8) < 0)
2094 			goto out_resource;
2095 		dummy64 = (u64)stat.blocks << 9;
2096 		WRITE64(dummy64);
2097 	}
2098 	if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2099 		if ((buflen -= 12) < 0)
2100 			goto out_resource;
2101 		WRITE32(0);
2102 		WRITE32(stat.atime.tv_sec);
2103 		WRITE32(stat.atime.tv_nsec);
2104 	}
2105 	if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2106 		if ((buflen -= 12) < 0)
2107 			goto out_resource;
2108 		WRITE32(0);
2109 		WRITE32(1);
2110 		WRITE32(0);
2111 	}
2112 	if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2113 		if ((buflen -= 12) < 0)
2114 			goto out_resource;
2115 		WRITE32(0);
2116 		WRITE32(stat.ctime.tv_sec);
2117 		WRITE32(stat.ctime.tv_nsec);
2118 	}
2119 	if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2120 		if ((buflen -= 12) < 0)
2121 			goto out_resource;
2122 		WRITE32(0);
2123 		WRITE32(stat.mtime.tv_sec);
2124 		WRITE32(stat.mtime.tv_nsec);
2125 	}
2126 	if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2127 		if ((buflen -= 8) < 0)
2128                 	goto out_resource;
2129 		/*
2130 		 * Get parent's attributes if not ignoring crossmount
2131 		 * and this is the root of a cross-mounted filesystem.
2132 		 */
2133 		if (ignore_crossmnt == 0 &&
2134 		    exp->ex_path.mnt->mnt_root->d_inode == dentry->d_inode) {
2135 			err = vfs_getattr(exp->ex_path.mnt->mnt_parent,
2136 				exp->ex_path.mnt->mnt_mountpoint, &stat);
2137 			if (err)
2138 				goto out_nfserr;
2139 		}
2140 		WRITE64(stat.ino);
2141 	}
2142 	if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2143 		WRITE32(3);
2144 		WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2145 		WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2146 		WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2147 	}
2148 
2149 	*attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2150 	*countp = p - buffer;
2151 	status = nfs_ok;
2152 
2153 out:
2154 	kfree(acl);
2155 	if (fhp == &tempfh)
2156 		fh_put(&tempfh);
2157 	return status;
2158 out_nfserr:
2159 	status = nfserrno(err);
2160 	goto out;
2161 out_resource:
2162 	*countp = 0;
2163 	status = nfserr_resource;
2164 	goto out;
2165 out_serverfault:
2166 	status = nfserr_serverfault;
2167 	goto out;
2168 }
2169 
2170 static inline int attributes_need_mount(u32 *bmval)
2171 {
2172 	if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2173 		return 1;
2174 	if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2175 		return 1;
2176 	return 0;
2177 }
2178 
2179 static __be32
2180 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2181 		const char *name, int namlen, __be32 *p, int *buflen)
2182 {
2183 	struct svc_export *exp = cd->rd_fhp->fh_export;
2184 	struct dentry *dentry;
2185 	__be32 nfserr;
2186 	int ignore_crossmnt = 0;
2187 
2188 	dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2189 	if (IS_ERR(dentry))
2190 		return nfserrno(PTR_ERR(dentry));
2191 	if (!dentry->d_inode) {
2192 		/*
2193 		 * nfsd_buffered_readdir drops the i_mutex between
2194 		 * readdir and calling this callback, leaving a window
2195 		 * where this directory entry could have gone away.
2196 		 */
2197 		dput(dentry);
2198 		return nfserr_noent;
2199 	}
2200 
2201 	exp_get(exp);
2202 	/*
2203 	 * In the case of a mountpoint, the client may be asking for
2204 	 * attributes that are only properties of the underlying filesystem
2205 	 * as opposed to the cross-mounted file system. In such a case,
2206 	 * we will not follow the cross mount and will fill the attribtutes
2207 	 * directly from the mountpoint dentry.
2208 	 */
2209 	if (d_mountpoint(dentry) && !attributes_need_mount(cd->rd_bmval))
2210 		ignore_crossmnt = 1;
2211 	else if (d_mountpoint(dentry)) {
2212 		int err;
2213 
2214 		/*
2215 		 * Why the heck aren't we just using nfsd_lookup??
2216 		 * Different "."/".." handling?  Something else?
2217 		 * At least, add a comment here to explain....
2218 		 */
2219 		err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2220 		if (err) {
2221 			nfserr = nfserrno(err);
2222 			goto out_put;
2223 		}
2224 		nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2225 		if (nfserr)
2226 			goto out_put;
2227 
2228 	}
2229 	nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2230 					cd->rd_rqstp, ignore_crossmnt);
2231 out_put:
2232 	dput(dentry);
2233 	exp_put(exp);
2234 	return nfserr;
2235 }
2236 
2237 static __be32 *
2238 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2239 {
2240 	__be32 *attrlenp;
2241 
2242 	if (buflen < 6)
2243 		return NULL;
2244 	*p++ = htonl(2);
2245 	*p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2246 	*p++ = htonl(0);			 /* bmval1 */
2247 
2248 	attrlenp = p++;
2249 	*p++ = nfserr;       /* no htonl */
2250 	*attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2251 	return p;
2252 }
2253 
2254 static int
2255 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2256 		    loff_t offset, u64 ino, unsigned int d_type)
2257 {
2258 	struct readdir_cd *ccd = ccdv;
2259 	struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2260 	int buflen;
2261 	__be32 *p = cd->buffer;
2262 	__be32 *cookiep;
2263 	__be32 nfserr = nfserr_toosmall;
2264 
2265 	/* In nfsv4, "." and ".." never make it onto the wire.. */
2266 	if (name && isdotent(name, namlen)) {
2267 		cd->common.err = nfs_ok;
2268 		return 0;
2269 	}
2270 
2271 	if (cd->offset)
2272 		xdr_encode_hyper(cd->offset, (u64) offset);
2273 
2274 	buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2275 	if (buflen < 0)
2276 		goto fail;
2277 
2278 	*p++ = xdr_one;                             /* mark entry present */
2279 	cookiep = p;
2280 	p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2281 	p = xdr_encode_array(p, name, namlen);      /* name length & name */
2282 
2283 	nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2284 	switch (nfserr) {
2285 	case nfs_ok:
2286 		p += buflen;
2287 		break;
2288 	case nfserr_resource:
2289 		nfserr = nfserr_toosmall;
2290 		goto fail;
2291 	case nfserr_dropit:
2292 		goto fail;
2293 	case nfserr_noent:
2294 		goto skip_entry;
2295 	default:
2296 		/*
2297 		 * If the client requested the RDATTR_ERROR attribute,
2298 		 * we stuff the error code into this attribute
2299 		 * and continue.  If this attribute was not requested,
2300 		 * then in accordance with the spec, we fail the
2301 		 * entire READDIR operation(!)
2302 		 */
2303 		if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2304 			goto fail;
2305 		p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2306 		if (p == NULL) {
2307 			nfserr = nfserr_toosmall;
2308 			goto fail;
2309 		}
2310 	}
2311 	cd->buflen -= (p - cd->buffer);
2312 	cd->buffer = p;
2313 	cd->offset = cookiep;
2314 skip_entry:
2315 	cd->common.err = nfs_ok;
2316 	return 0;
2317 fail:
2318 	cd->common.err = nfserr;
2319 	return -EINVAL;
2320 }
2321 
2322 static void
2323 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2324 {
2325 	__be32 *p;
2326 
2327 	RESERVE_SPACE(sizeof(stateid_t));
2328 	WRITE32(sid->si_generation);
2329 	WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2330 	ADJUST_ARGS();
2331 }
2332 
2333 static __be32
2334 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2335 {
2336 	__be32 *p;
2337 
2338 	if (!nfserr) {
2339 		RESERVE_SPACE(8);
2340 		WRITE32(access->ac_supported);
2341 		WRITE32(access->ac_resp_access);
2342 		ADJUST_ARGS();
2343 	}
2344 	return nfserr;
2345 }
2346 
2347 static __be32
2348 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2349 {
2350 	ENCODE_SEQID_OP_HEAD;
2351 
2352 	if (!nfserr)
2353 		nfsd4_encode_stateid(resp, &close->cl_stateid);
2354 
2355 	ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
2356 	return nfserr;
2357 }
2358 
2359 
2360 static __be32
2361 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2362 {
2363 	__be32 *p;
2364 
2365 	if (!nfserr) {
2366 		RESERVE_SPACE(8);
2367 		WRITEMEM(commit->co_verf.data, 8);
2368 		ADJUST_ARGS();
2369 	}
2370 	return nfserr;
2371 }
2372 
2373 static __be32
2374 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2375 {
2376 	__be32 *p;
2377 
2378 	if (!nfserr) {
2379 		RESERVE_SPACE(32);
2380 		write_cinfo(&p, &create->cr_cinfo);
2381 		WRITE32(2);
2382 		WRITE32(create->cr_bmval[0]);
2383 		WRITE32(create->cr_bmval[1]);
2384 		ADJUST_ARGS();
2385 	}
2386 	return nfserr;
2387 }
2388 
2389 static __be32
2390 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2391 {
2392 	struct svc_fh *fhp = getattr->ga_fhp;
2393 	int buflen;
2394 
2395 	if (nfserr)
2396 		return nfserr;
2397 
2398 	buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2399 	nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2400 				    resp->p, &buflen, getattr->ga_bmval,
2401 				    resp->rqstp, 0);
2402 	if (!nfserr)
2403 		resp->p += buflen;
2404 	return nfserr;
2405 }
2406 
2407 static __be32
2408 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2409 {
2410 	struct svc_fh *fhp = *fhpp;
2411 	unsigned int len;
2412 	__be32 *p;
2413 
2414 	if (!nfserr) {
2415 		len = fhp->fh_handle.fh_size;
2416 		RESERVE_SPACE(len + 4);
2417 		WRITE32(len);
2418 		WRITEMEM(&fhp->fh_handle.fh_base, len);
2419 		ADJUST_ARGS();
2420 	}
2421 	return nfserr;
2422 }
2423 
2424 /*
2425 * Including all fields other than the name, a LOCK4denied structure requires
2426 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2427 */
2428 static void
2429 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2430 {
2431 	__be32 *p;
2432 
2433 	RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2434 	WRITE64(ld->ld_start);
2435 	WRITE64(ld->ld_length);
2436 	WRITE32(ld->ld_type);
2437 	if (ld->ld_sop) {
2438 		WRITEMEM(&ld->ld_clientid, 8);
2439 		WRITE32(ld->ld_sop->so_owner.len);
2440 		WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2441 		kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2442 	}  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2443 		WRITE64((u64)0); /* clientid */
2444 		WRITE32(0); /* length of owner name */
2445 	}
2446 	ADJUST_ARGS();
2447 }
2448 
2449 static __be32
2450 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2451 {
2452 	ENCODE_SEQID_OP_HEAD;
2453 
2454 	if (!nfserr)
2455 		nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2456 	else if (nfserr == nfserr_denied)
2457 		nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2458 
2459 	ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2460 	return nfserr;
2461 }
2462 
2463 static __be32
2464 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2465 {
2466 	if (nfserr == nfserr_denied)
2467 		nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2468 	return nfserr;
2469 }
2470 
2471 static __be32
2472 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2473 {
2474 	ENCODE_SEQID_OP_HEAD;
2475 
2476 	if (!nfserr)
2477 		nfsd4_encode_stateid(resp, &locku->lu_stateid);
2478 
2479 	ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2480 	return nfserr;
2481 }
2482 
2483 
2484 static __be32
2485 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2486 {
2487 	__be32 *p;
2488 
2489 	if (!nfserr) {
2490 		RESERVE_SPACE(20);
2491 		write_cinfo(&p, &link->li_cinfo);
2492 		ADJUST_ARGS();
2493 	}
2494 	return nfserr;
2495 }
2496 
2497 
2498 static __be32
2499 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2500 {
2501 	__be32 *p;
2502 	ENCODE_SEQID_OP_HEAD;
2503 
2504 	if (nfserr)
2505 		goto out;
2506 
2507 	nfsd4_encode_stateid(resp, &open->op_stateid);
2508 	RESERVE_SPACE(40);
2509 	write_cinfo(&p, &open->op_cinfo);
2510 	WRITE32(open->op_rflags);
2511 	WRITE32(2);
2512 	WRITE32(open->op_bmval[0]);
2513 	WRITE32(open->op_bmval[1]);
2514 	WRITE32(open->op_delegate_type);
2515 	ADJUST_ARGS();
2516 
2517 	switch (open->op_delegate_type) {
2518 	case NFS4_OPEN_DELEGATE_NONE:
2519 		break;
2520 	case NFS4_OPEN_DELEGATE_READ:
2521 		nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2522 		RESERVE_SPACE(20);
2523 		WRITE32(open->op_recall);
2524 
2525 		/*
2526 		 * TODO: ACE's in delegations
2527 		 */
2528 		WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2529 		WRITE32(0);
2530 		WRITE32(0);
2531 		WRITE32(0);   /* XXX: is NULL principal ok? */
2532 		ADJUST_ARGS();
2533 		break;
2534 	case NFS4_OPEN_DELEGATE_WRITE:
2535 		nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2536 		RESERVE_SPACE(32);
2537 		WRITE32(0);
2538 
2539 		/*
2540 		 * TODO: space_limit's in delegations
2541 		 */
2542 		WRITE32(NFS4_LIMIT_SIZE);
2543 		WRITE32(~(u32)0);
2544 		WRITE32(~(u32)0);
2545 
2546 		/*
2547 		 * TODO: ACE's in delegations
2548 		 */
2549 		WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2550 		WRITE32(0);
2551 		WRITE32(0);
2552 		WRITE32(0);   /* XXX: is NULL principal ok? */
2553 		ADJUST_ARGS();
2554 		break;
2555 	default:
2556 		BUG();
2557 	}
2558 	/* XXX save filehandle here */
2559 out:
2560 	ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2561 	return nfserr;
2562 }
2563 
2564 static __be32
2565 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2566 {
2567 	ENCODE_SEQID_OP_HEAD;
2568 
2569 	if (!nfserr)
2570 		nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2571 
2572 	ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2573 	return nfserr;
2574 }
2575 
2576 static __be32
2577 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2578 {
2579 	ENCODE_SEQID_OP_HEAD;
2580 
2581 	if (!nfserr)
2582 		nfsd4_encode_stateid(resp, &od->od_stateid);
2583 
2584 	ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2585 	return nfserr;
2586 }
2587 
2588 static __be32
2589 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2590 		  struct nfsd4_read *read)
2591 {
2592 	u32 eof;
2593 	int v, pn;
2594 	unsigned long maxcount;
2595 	long len;
2596 	__be32 *p;
2597 
2598 	if (nfserr)
2599 		return nfserr;
2600 	if (resp->xbuf->page_len)
2601 		return nfserr_resource;
2602 
2603 	RESERVE_SPACE(8); /* eof flag and byte count */
2604 
2605 	maxcount = svc_max_payload(resp->rqstp);
2606 	if (maxcount > read->rd_length)
2607 		maxcount = read->rd_length;
2608 
2609 	len = maxcount;
2610 	v = 0;
2611 	while (len > 0) {
2612 		pn = resp->rqstp->rq_resused++;
2613 		resp->rqstp->rq_vec[v].iov_base =
2614 			page_address(resp->rqstp->rq_respages[pn]);
2615 		resp->rqstp->rq_vec[v].iov_len =
2616 			len < PAGE_SIZE ? len : PAGE_SIZE;
2617 		v++;
2618 		len -= PAGE_SIZE;
2619 	}
2620 	read->rd_vlen = v;
2621 
2622 	nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2623 			read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2624 			&maxcount);
2625 
2626 	if (nfserr == nfserr_symlink)
2627 		nfserr = nfserr_inval;
2628 	if (nfserr)
2629 		return nfserr;
2630 	eof = (read->rd_offset + maxcount >=
2631 	       read->rd_fhp->fh_dentry->d_inode->i_size);
2632 
2633 	WRITE32(eof);
2634 	WRITE32(maxcount);
2635 	ADJUST_ARGS();
2636 	resp->xbuf->head[0].iov_len = (char*)p
2637 					- (char*)resp->xbuf->head[0].iov_base;
2638 	resp->xbuf->page_len = maxcount;
2639 
2640 	/* Use rest of head for padding and remaining ops: */
2641 	resp->xbuf->tail[0].iov_base = p;
2642 	resp->xbuf->tail[0].iov_len = 0;
2643 	if (maxcount&3) {
2644 		RESERVE_SPACE(4);
2645 		WRITE32(0);
2646 		resp->xbuf->tail[0].iov_base += maxcount&3;
2647 		resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2648 		ADJUST_ARGS();
2649 	}
2650 	return 0;
2651 }
2652 
2653 static __be32
2654 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2655 {
2656 	int maxcount;
2657 	char *page;
2658 	__be32 *p;
2659 
2660 	if (nfserr)
2661 		return nfserr;
2662 	if (resp->xbuf->page_len)
2663 		return nfserr_resource;
2664 
2665 	page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2666 
2667 	maxcount = PAGE_SIZE;
2668 	RESERVE_SPACE(4);
2669 
2670 	/*
2671 	 * XXX: By default, the ->readlink() VFS op will truncate symlinks
2672 	 * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2673 	 * not, one easy fix is: if ->readlink() precisely fills the buffer,
2674 	 * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2675 	 */
2676 	nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2677 	if (nfserr == nfserr_isdir)
2678 		return nfserr_inval;
2679 	if (nfserr)
2680 		return nfserr;
2681 
2682 	WRITE32(maxcount);
2683 	ADJUST_ARGS();
2684 	resp->xbuf->head[0].iov_len = (char*)p
2685 				- (char*)resp->xbuf->head[0].iov_base;
2686 	resp->xbuf->page_len = maxcount;
2687 
2688 	/* Use rest of head for padding and remaining ops: */
2689 	resp->xbuf->tail[0].iov_base = p;
2690 	resp->xbuf->tail[0].iov_len = 0;
2691 	if (maxcount&3) {
2692 		RESERVE_SPACE(4);
2693 		WRITE32(0);
2694 		resp->xbuf->tail[0].iov_base += maxcount&3;
2695 		resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2696 		ADJUST_ARGS();
2697 	}
2698 	return 0;
2699 }
2700 
2701 static __be32
2702 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2703 {
2704 	int maxcount;
2705 	loff_t offset;
2706 	__be32 *page, *savep, *tailbase;
2707 	__be32 *p;
2708 
2709 	if (nfserr)
2710 		return nfserr;
2711 	if (resp->xbuf->page_len)
2712 		return nfserr_resource;
2713 
2714 	RESERVE_SPACE(8);  /* verifier */
2715 	savep = p;
2716 
2717 	/* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2718 	WRITE32(0);
2719 	WRITE32(0);
2720 	ADJUST_ARGS();
2721 	resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2722 	tailbase = p;
2723 
2724 	maxcount = PAGE_SIZE;
2725 	if (maxcount > readdir->rd_maxcount)
2726 		maxcount = readdir->rd_maxcount;
2727 
2728 	/*
2729 	 * Convert from bytes to words, account for the two words already
2730 	 * written, make sure to leave two words at the end for the next
2731 	 * pointer and eof field.
2732 	 */
2733 	maxcount = (maxcount >> 2) - 4;
2734 	if (maxcount < 0) {
2735 		nfserr =  nfserr_toosmall;
2736 		goto err_no_verf;
2737 	}
2738 
2739 	page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2740 	readdir->common.err = 0;
2741 	readdir->buflen = maxcount;
2742 	readdir->buffer = page;
2743 	readdir->offset = NULL;
2744 
2745 	offset = readdir->rd_cookie;
2746 	nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2747 			      &offset,
2748 			      &readdir->common, nfsd4_encode_dirent);
2749 	if (nfserr == nfs_ok &&
2750 	    readdir->common.err == nfserr_toosmall &&
2751 	    readdir->buffer == page)
2752 		nfserr = nfserr_toosmall;
2753 	if (nfserr == nfserr_symlink)
2754 		nfserr = nfserr_notdir;
2755 	if (nfserr)
2756 		goto err_no_verf;
2757 
2758 	if (readdir->offset)
2759 		xdr_encode_hyper(readdir->offset, offset);
2760 
2761 	p = readdir->buffer;
2762 	*p++ = 0;	/* no more entries */
2763 	*p++ = htonl(readdir->common.err == nfserr_eof);
2764 	resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2765 		resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2766 
2767 	/* Use rest of head for padding and remaining ops: */
2768 	resp->xbuf->tail[0].iov_base = tailbase;
2769 	resp->xbuf->tail[0].iov_len = 0;
2770 	resp->p = resp->xbuf->tail[0].iov_base;
2771 	resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2772 
2773 	return 0;
2774 err_no_verf:
2775 	p = savep;
2776 	ADJUST_ARGS();
2777 	return nfserr;
2778 }
2779 
2780 static __be32
2781 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2782 {
2783 	__be32 *p;
2784 
2785 	if (!nfserr) {
2786 		RESERVE_SPACE(20);
2787 		write_cinfo(&p, &remove->rm_cinfo);
2788 		ADJUST_ARGS();
2789 	}
2790 	return nfserr;
2791 }
2792 
2793 static __be32
2794 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2795 {
2796 	__be32 *p;
2797 
2798 	if (!nfserr) {
2799 		RESERVE_SPACE(40);
2800 		write_cinfo(&p, &rename->rn_sinfo);
2801 		write_cinfo(&p, &rename->rn_tinfo);
2802 		ADJUST_ARGS();
2803 	}
2804 	return nfserr;
2805 }
2806 
2807 static __be32
2808 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
2809 		     struct nfsd4_secinfo *secinfo)
2810 {
2811 	int i = 0;
2812 	struct svc_export *exp = secinfo->si_exp;
2813 	u32 nflavs;
2814 	struct exp_flavor_info *flavs;
2815 	struct exp_flavor_info def_flavs[2];
2816 	__be32 *p;
2817 
2818 	if (nfserr)
2819 		goto out;
2820 	if (exp->ex_nflavors) {
2821 		flavs = exp->ex_flavors;
2822 		nflavs = exp->ex_nflavors;
2823 	} else { /* Handling of some defaults in absence of real secinfo: */
2824 		flavs = def_flavs;
2825 		if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
2826 			nflavs = 2;
2827 			flavs[0].pseudoflavor = RPC_AUTH_UNIX;
2828 			flavs[1].pseudoflavor = RPC_AUTH_NULL;
2829 		} else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
2830 			nflavs = 1;
2831 			flavs[0].pseudoflavor
2832 					= svcauth_gss_flavor(exp->ex_client);
2833 		} else {
2834 			nflavs = 1;
2835 			flavs[0].pseudoflavor
2836 					= exp->ex_client->flavour->flavour;
2837 		}
2838 	}
2839 
2840 	RESERVE_SPACE(4);
2841 	WRITE32(nflavs);
2842 	ADJUST_ARGS();
2843 	for (i = 0; i < nflavs; i++) {
2844 		u32 flav = flavs[i].pseudoflavor;
2845 		struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
2846 
2847 		if (gm) {
2848 			RESERVE_SPACE(4);
2849 			WRITE32(RPC_AUTH_GSS);
2850 			ADJUST_ARGS();
2851 			RESERVE_SPACE(4 + gm->gm_oid.len);
2852 			WRITE32(gm->gm_oid.len);
2853 			WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
2854 			ADJUST_ARGS();
2855 			RESERVE_SPACE(4);
2856 			WRITE32(0); /* qop */
2857 			ADJUST_ARGS();
2858 			RESERVE_SPACE(4);
2859 			WRITE32(gss_pseudoflavor_to_service(gm, flav));
2860 			ADJUST_ARGS();
2861 			gss_mech_put(gm);
2862 		} else {
2863 			RESERVE_SPACE(4);
2864 			WRITE32(flav);
2865 			ADJUST_ARGS();
2866 		}
2867 	}
2868 out:
2869 	if (exp)
2870 		exp_put(exp);
2871 	return nfserr;
2872 }
2873 
2874 /*
2875  * The SETATTR encode routine is special -- it always encodes a bitmap,
2876  * regardless of the error status.
2877  */
2878 static __be32
2879 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2880 {
2881 	__be32 *p;
2882 
2883 	RESERVE_SPACE(12);
2884 	if (nfserr) {
2885 		WRITE32(2);
2886 		WRITE32(0);
2887 		WRITE32(0);
2888 	}
2889 	else {
2890 		WRITE32(2);
2891 		WRITE32(setattr->sa_bmval[0]);
2892 		WRITE32(setattr->sa_bmval[1]);
2893 	}
2894 	ADJUST_ARGS();
2895 	return nfserr;
2896 }
2897 
2898 static __be32
2899 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2900 {
2901 	__be32 *p;
2902 
2903 	if (!nfserr) {
2904 		RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2905 		WRITEMEM(&scd->se_clientid, 8);
2906 		WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2907 		ADJUST_ARGS();
2908 	}
2909 	else if (nfserr == nfserr_clid_inuse) {
2910 		RESERVE_SPACE(8);
2911 		WRITE32(0);
2912 		WRITE32(0);
2913 		ADJUST_ARGS();
2914 	}
2915 	return nfserr;
2916 }
2917 
2918 static __be32
2919 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2920 {
2921 	__be32 *p;
2922 
2923 	if (!nfserr) {
2924 		RESERVE_SPACE(16);
2925 		WRITE32(write->wr_bytes_written);
2926 		WRITE32(write->wr_how_written);
2927 		WRITEMEM(write->wr_verifier.data, 8);
2928 		ADJUST_ARGS();
2929 	}
2930 	return nfserr;
2931 }
2932 
2933 static __be32
2934 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, int nfserr,
2935 			 struct nfsd4_exchange_id *exid)
2936 {
2937 	__be32 *p;
2938 	char *major_id;
2939 	char *server_scope;
2940 	int major_id_sz;
2941 	int server_scope_sz;
2942 	uint64_t minor_id = 0;
2943 
2944 	if (nfserr)
2945 		return nfserr;
2946 
2947 	major_id = utsname()->nodename;
2948 	major_id_sz = strlen(major_id);
2949 	server_scope = utsname()->nodename;
2950 	server_scope_sz = strlen(server_scope);
2951 
2952 	RESERVE_SPACE(
2953 		8 /* eir_clientid */ +
2954 		4 /* eir_sequenceid */ +
2955 		4 /* eir_flags */ +
2956 		4 /* spr_how (SP4_NONE) */ +
2957 		8 /* so_minor_id */ +
2958 		4 /* so_major_id.len */ +
2959 		(XDR_QUADLEN(major_id_sz) * 4) +
2960 		4 /* eir_server_scope.len */ +
2961 		(XDR_QUADLEN(server_scope_sz) * 4) +
2962 		4 /* eir_server_impl_id.count (0) */);
2963 
2964 	WRITEMEM(&exid->clientid, 8);
2965 	WRITE32(exid->seqid);
2966 	WRITE32(exid->flags);
2967 
2968 	/* state_protect4_r. Currently only support SP4_NONE */
2969 	BUG_ON(exid->spa_how != SP4_NONE);
2970 	WRITE32(exid->spa_how);
2971 
2972 	/* The server_owner struct */
2973 	WRITE64(minor_id);      /* Minor id */
2974 	/* major id */
2975 	WRITE32(major_id_sz);
2976 	WRITEMEM(major_id, major_id_sz);
2977 
2978 	/* Server scope */
2979 	WRITE32(server_scope_sz);
2980 	WRITEMEM(server_scope, server_scope_sz);
2981 
2982 	/* Implementation id */
2983 	WRITE32(0);	/* zero length nfs_impl_id4 array */
2984 	ADJUST_ARGS();
2985 	return 0;
2986 }
2987 
2988 static __be32
2989 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, int nfserr,
2990 			    struct nfsd4_create_session *sess)
2991 {
2992 	__be32 *p;
2993 
2994 	if (nfserr)
2995 		return nfserr;
2996 
2997 	RESERVE_SPACE(24);
2998 	WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2999 	WRITE32(sess->seqid);
3000 	WRITE32(sess->flags);
3001 	ADJUST_ARGS();
3002 
3003 	RESERVE_SPACE(28);
3004 	WRITE32(0); /* headerpadsz */
3005 	WRITE32(sess->fore_channel.maxreq_sz);
3006 	WRITE32(sess->fore_channel.maxresp_sz);
3007 	WRITE32(sess->fore_channel.maxresp_cached);
3008 	WRITE32(sess->fore_channel.maxops);
3009 	WRITE32(sess->fore_channel.maxreqs);
3010 	WRITE32(sess->fore_channel.nr_rdma_attrs);
3011 	ADJUST_ARGS();
3012 
3013 	if (sess->fore_channel.nr_rdma_attrs) {
3014 		RESERVE_SPACE(4);
3015 		WRITE32(sess->fore_channel.rdma_attrs);
3016 		ADJUST_ARGS();
3017 	}
3018 
3019 	RESERVE_SPACE(28);
3020 	WRITE32(0); /* headerpadsz */
3021 	WRITE32(sess->back_channel.maxreq_sz);
3022 	WRITE32(sess->back_channel.maxresp_sz);
3023 	WRITE32(sess->back_channel.maxresp_cached);
3024 	WRITE32(sess->back_channel.maxops);
3025 	WRITE32(sess->back_channel.maxreqs);
3026 	WRITE32(sess->back_channel.nr_rdma_attrs);
3027 	ADJUST_ARGS();
3028 
3029 	if (sess->back_channel.nr_rdma_attrs) {
3030 		RESERVE_SPACE(4);
3031 		WRITE32(sess->back_channel.rdma_attrs);
3032 		ADJUST_ARGS();
3033 	}
3034 	return 0;
3035 }
3036 
3037 static __be32
3038 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, int nfserr,
3039 			     struct nfsd4_destroy_session *destroy_session)
3040 {
3041 	return nfserr;
3042 }
3043 
3044 __be32
3045 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,
3046 		      struct nfsd4_sequence *seq)
3047 {
3048 	__be32 *p;
3049 
3050 	if (nfserr)
3051 		return nfserr;
3052 
3053 	RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3054 	WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3055 	WRITE32(seq->seqid);
3056 	WRITE32(seq->slotid);
3057 	WRITE32(seq->maxslots);
3058 	/*
3059 	 * FIXME: for now:
3060 	 *   target_maxslots = maxslots
3061 	 *   status_flags = 0
3062 	 */
3063 	WRITE32(seq->maxslots);
3064 	WRITE32(0);
3065 
3066 	ADJUST_ARGS();
3067 	return 0;
3068 }
3069 
3070 static __be32
3071 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3072 {
3073 	return nfserr;
3074 }
3075 
3076 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3077 
3078 /*
3079  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3080  * since we don't need to filter out obsolete ops as this is
3081  * done in the decoding phase.
3082  */
3083 static nfsd4_enc nfsd4_enc_ops[] = {
3084 	[OP_ACCESS]		= (nfsd4_enc)nfsd4_encode_access,
3085 	[OP_CLOSE]		= (nfsd4_enc)nfsd4_encode_close,
3086 	[OP_COMMIT]		= (nfsd4_enc)nfsd4_encode_commit,
3087 	[OP_CREATE]		= (nfsd4_enc)nfsd4_encode_create,
3088 	[OP_DELEGPURGE]		= (nfsd4_enc)nfsd4_encode_noop,
3089 	[OP_DELEGRETURN]	= (nfsd4_enc)nfsd4_encode_noop,
3090 	[OP_GETATTR]		= (nfsd4_enc)nfsd4_encode_getattr,
3091 	[OP_GETFH]		= (nfsd4_enc)nfsd4_encode_getfh,
3092 	[OP_LINK]		= (nfsd4_enc)nfsd4_encode_link,
3093 	[OP_LOCK]		= (nfsd4_enc)nfsd4_encode_lock,
3094 	[OP_LOCKT]		= (nfsd4_enc)nfsd4_encode_lockt,
3095 	[OP_LOCKU]		= (nfsd4_enc)nfsd4_encode_locku,
3096 	[OP_LOOKUP]		= (nfsd4_enc)nfsd4_encode_noop,
3097 	[OP_LOOKUPP]		= (nfsd4_enc)nfsd4_encode_noop,
3098 	[OP_NVERIFY]		= (nfsd4_enc)nfsd4_encode_noop,
3099 	[OP_OPEN]		= (nfsd4_enc)nfsd4_encode_open,
3100 	[OP_OPENATTR]		= (nfsd4_enc)nfsd4_encode_noop,
3101 	[OP_OPEN_CONFIRM]	= (nfsd4_enc)nfsd4_encode_open_confirm,
3102 	[OP_OPEN_DOWNGRADE]	= (nfsd4_enc)nfsd4_encode_open_downgrade,
3103 	[OP_PUTFH]		= (nfsd4_enc)nfsd4_encode_noop,
3104 	[OP_PUTPUBFH]		= (nfsd4_enc)nfsd4_encode_noop,
3105 	[OP_PUTROOTFH]		= (nfsd4_enc)nfsd4_encode_noop,
3106 	[OP_READ]		= (nfsd4_enc)nfsd4_encode_read,
3107 	[OP_READDIR]		= (nfsd4_enc)nfsd4_encode_readdir,
3108 	[OP_READLINK]		= (nfsd4_enc)nfsd4_encode_readlink,
3109 	[OP_REMOVE]		= (nfsd4_enc)nfsd4_encode_remove,
3110 	[OP_RENAME]		= (nfsd4_enc)nfsd4_encode_rename,
3111 	[OP_RENEW]		= (nfsd4_enc)nfsd4_encode_noop,
3112 	[OP_RESTOREFH]		= (nfsd4_enc)nfsd4_encode_noop,
3113 	[OP_SAVEFH]		= (nfsd4_enc)nfsd4_encode_noop,
3114 	[OP_SECINFO]		= (nfsd4_enc)nfsd4_encode_secinfo,
3115 	[OP_SETATTR]		= (nfsd4_enc)nfsd4_encode_setattr,
3116 	[OP_SETCLIENTID]	= (nfsd4_enc)nfsd4_encode_setclientid,
3117 	[OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3118 	[OP_VERIFY]		= (nfsd4_enc)nfsd4_encode_noop,
3119 	[OP_WRITE]		= (nfsd4_enc)nfsd4_encode_write,
3120 	[OP_RELEASE_LOCKOWNER]	= (nfsd4_enc)nfsd4_encode_noop,
3121 
3122 	/* NFSv4.1 operations */
3123 	[OP_BACKCHANNEL_CTL]	= (nfsd4_enc)nfsd4_encode_noop,
3124 	[OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
3125 	[OP_EXCHANGE_ID]	= (nfsd4_enc)nfsd4_encode_exchange_id,
3126 	[OP_CREATE_SESSION]	= (nfsd4_enc)nfsd4_encode_create_session,
3127 	[OP_DESTROY_SESSION]	= (nfsd4_enc)nfsd4_encode_destroy_session,
3128 	[OP_FREE_STATEID]	= (nfsd4_enc)nfsd4_encode_noop,
3129 	[OP_GET_DIR_DELEGATION]	= (nfsd4_enc)nfsd4_encode_noop,
3130 	[OP_GETDEVICEINFO]	= (nfsd4_enc)nfsd4_encode_noop,
3131 	[OP_GETDEVICELIST]	= (nfsd4_enc)nfsd4_encode_noop,
3132 	[OP_LAYOUTCOMMIT]	= (nfsd4_enc)nfsd4_encode_noop,
3133 	[OP_LAYOUTGET]		= (nfsd4_enc)nfsd4_encode_noop,
3134 	[OP_LAYOUTRETURN]	= (nfsd4_enc)nfsd4_encode_noop,
3135 	[OP_SECINFO_NO_NAME]	= (nfsd4_enc)nfsd4_encode_noop,
3136 	[OP_SEQUENCE]		= (nfsd4_enc)nfsd4_encode_sequence,
3137 	[OP_SET_SSV]		= (nfsd4_enc)nfsd4_encode_noop,
3138 	[OP_TEST_STATEID]	= (nfsd4_enc)nfsd4_encode_noop,
3139 	[OP_WANT_DELEGATION]	= (nfsd4_enc)nfsd4_encode_noop,
3140 	[OP_DESTROY_CLIENTID]	= (nfsd4_enc)nfsd4_encode_noop,
3141 	[OP_RECLAIM_COMPLETE]	= (nfsd4_enc)nfsd4_encode_noop,
3142 };
3143 
3144 /*
3145  * Calculate the total amount of memory that the compound response has taken
3146  * after encoding the current operation.
3147  *
3148  * pad: add on 8 bytes for the next operation's op_code and status so that
3149  * there is room to cache a failure on the next operation.
3150  *
3151  * Compare this length to the session se_fmaxresp_cached.
3152  *
3153  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3154  * will be at least a page and will therefore hold the xdr_buf head.
3155  */
3156 static int nfsd4_check_drc_limit(struct nfsd4_compoundres *resp)
3157 {
3158 	int status = 0;
3159 	struct xdr_buf *xb = &resp->rqstp->rq_res;
3160 	struct nfsd4_compoundargs *args = resp->rqstp->rq_argp;
3161 	struct nfsd4_session *session = NULL;
3162 	struct nfsd4_slot *slot = resp->cstate.slot;
3163 	u32 length, tlen = 0, pad = 8;
3164 
3165 	if (!nfsd4_has_session(&resp->cstate))
3166 		return status;
3167 
3168 	session = resp->cstate.session;
3169 	if (session == NULL || slot->sl_cache_entry.ce_cachethis == 0)
3170 		return status;
3171 
3172 	if (resp->opcnt >= args->opcnt)
3173 		pad = 0; /* this is the last operation */
3174 
3175 	if (xb->page_len == 0) {
3176 		length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3177 	} else {
3178 		if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3179 			tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3180 
3181 		length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3182 	}
3183 	dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3184 		length, xb->page_len, tlen, pad);
3185 
3186 	if (length <= session->se_fchannel.maxresp_cached)
3187 		return status;
3188 	else
3189 		return nfserr_rep_too_big_to_cache;
3190 }
3191 
3192 void
3193 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3194 {
3195 	__be32 *statp;
3196 	__be32 *p;
3197 
3198 	RESERVE_SPACE(8);
3199 	WRITE32(op->opnum);
3200 	statp = p++;	/* to be backfilled at the end */
3201 	ADJUST_ARGS();
3202 
3203 	if (op->opnum == OP_ILLEGAL)
3204 		goto status;
3205 	BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3206 	       !nfsd4_enc_ops[op->opnum]);
3207 	op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3208 	/* nfsd4_check_drc_limit guarantees enough room for error status */
3209 	if (!op->status && nfsd4_check_drc_limit(resp))
3210 		op->status = nfserr_rep_too_big_to_cache;
3211 status:
3212 	/*
3213 	 * Note: We write the status directly, instead of using WRITE32(),
3214 	 * since it is already in network byte order.
3215 	 */
3216 	*statp = op->status;
3217 }
3218 
3219 /*
3220  * Encode the reply stored in the stateowner reply cache
3221  *
3222  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3223  * previously sent already encoded operation.
3224  *
3225  * called with nfs4_lock_state() held
3226  */
3227 void
3228 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3229 {
3230 	__be32 *p;
3231 	struct nfs4_replay *rp = op->replay;
3232 
3233 	BUG_ON(!rp);
3234 
3235 	RESERVE_SPACE(8);
3236 	WRITE32(op->opnum);
3237 	*p++ = rp->rp_status;  /* already xdr'ed */
3238 	ADJUST_ARGS();
3239 
3240 	RESERVE_SPACE(rp->rp_buflen);
3241 	WRITEMEM(rp->rp_buf, rp->rp_buflen);
3242 	ADJUST_ARGS();
3243 }
3244 
3245 int
3246 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3247 {
3248         return xdr_ressize_check(rqstp, p);
3249 }
3250 
3251 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
3252 {
3253 	if (args->ops != args->iops) {
3254 		kfree(args->ops);
3255 		args->ops = args->iops;
3256 	}
3257 	kfree(args->tmpp);
3258 	args->tmpp = NULL;
3259 	while (args->to_free) {
3260 		struct tmpbuf *tb = args->to_free;
3261 		args->to_free = tb->next;
3262 		tb->release(tb->buf);
3263 		kfree(tb);
3264 	}
3265 }
3266 
3267 int
3268 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3269 {
3270 	__be32 status;
3271 
3272 	args->p = p;
3273 	args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3274 	args->pagelist = rqstp->rq_arg.pages;
3275 	args->pagelen = rqstp->rq_arg.page_len;
3276 	args->tmpp = NULL;
3277 	args->to_free = NULL;
3278 	args->ops = args->iops;
3279 	args->rqstp = rqstp;
3280 
3281 	status = nfsd4_decode_compound(args);
3282 	if (status) {
3283 		nfsd4_release_compoundargs(args);
3284 	}
3285 	return !status;
3286 }
3287 
3288 int
3289 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3290 {
3291 	/*
3292 	 * All that remains is to write the tag and operation count...
3293 	 */
3294 	struct kvec *iov;
3295 	p = resp->tagp;
3296 	*p++ = htonl(resp->taglen);
3297 	memcpy(p, resp->tag, resp->taglen);
3298 	p += XDR_QUADLEN(resp->taglen);
3299 	*p++ = htonl(resp->opcnt);
3300 
3301 	if (rqstp->rq_res.page_len)
3302 		iov = &rqstp->rq_res.tail[0];
3303 	else
3304 		iov = &rqstp->rq_res.head[0];
3305 	iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3306 	BUG_ON(iov->iov_len > PAGE_SIZE);
3307 	if (nfsd4_has_session(&resp->cstate)) {
3308 		if (resp->cstate.status == nfserr_replay_cache &&
3309 				!nfsd4_not_cached(resp)) {
3310 			iov->iov_len = resp->cstate.iovlen;
3311 		} else {
3312 			nfsd4_store_cache_entry(resp);
3313 			dprintk("%s: SET SLOT STATE TO AVAILABLE\n", __func__);
3314 			resp->cstate.slot->sl_inuse = 0;
3315 		}
3316 		if (resp->cstate.session)
3317 			nfsd4_put_session(resp->cstate.session);
3318 	}
3319 	return 1;
3320 }
3321 
3322 /*
3323  * Local variables:
3324  *  c-basic-offset: 8
3325  * End:
3326  */
3327