1	/*
2	* Server-side XDR for NFSv4
3	*
4	* Copyright (c) 2002 The Regents of the University of Michigan.
5	* All rights reserved.
6	*
7	* Kendrick Smith <kmsmith@umich.edu>
8	* Andy Adamson <andros@umich.edu>
9	*
10	* Redistribution and use in source and binary forms, with or without
11	* modification, are permitted provided that the following conditions
12	* are met:
13	*
14	* 1. Redistributions of source code must retain the above copyright
15	* notice, this list of conditions and the following disclaimer.
16	* 2. Redistributions in binary form must reproduce the above copyright
17	* notice, this list of conditions and the following disclaimer in the
18	* documentation and/or other materials provided with the distribution.
19	* 3. Neither the name of the University nor the names of its
20	* contributors may be used to endorse or promote products derived
21	* from this software without specific prior written permission.
22	*
23	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26	* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30	* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31	* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32	* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33	* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34	*/
35
36	#include <linux/file.h>
37	#include <linux/slab.h>
38	#include <linux/namei.h>
39	#include <linux/statfs.h>
40	#include <linux/utsname.h>
41	#include <linux/pagemap.h>
42	#include <linux/sunrpc/svcauth_gss.h>
43	#include <linux/sunrpc/addr.h>
44	#include <linux/xattr.h>
45	#include <linux/vmalloc.h>
46
47	#include <uapi/linux/xattr.h>
48
49	#include "idmap.h"
50	#include "acl.h"
51	#include "xdr4.h"
52	#include "vfs.h"
53	#include "state.h"
54	#include "cache.h"
55	#include "netns.h"
56	#include "pnfs.h"
57	#include "filecache.h"
58
59	#include "trace.h"
60
61	#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
62	#include <linux/security.h>
63	#endif
64
65
66	#define NFSDDBG_FACILITY NFSDDBG_XDR
67
68	const u32 nfsd_suppattrs[3][3] = {
69	{NFSD4_SUPPORTED_ATTRS_WORD0,
70	NFSD4_SUPPORTED_ATTRS_WORD1,
71	NFSD4_SUPPORTED_ATTRS_WORD2},
72
73	{NFSD4_1_SUPPORTED_ATTRS_WORD0,
74	NFSD4_1_SUPPORTED_ATTRS_WORD1,
75	NFSD4_1_SUPPORTED_ATTRS_WORD2},
76
77	{NFSD4_1_SUPPORTED_ATTRS_WORD0,
78	NFSD4_1_SUPPORTED_ATTRS_WORD1,
79	NFSD4_2_SUPPORTED_ATTRS_WORD2},
80	};
81
82	/*
83	* As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
84	* directory in order to indicate to the client that a filesystem boundary is present
85	* We use a fixed fsid for a referral
86	*/
87	#define NFS4_REFERRAL_FSID_MAJOR 0x8000000ULL
88	#define NFS4_REFERRAL_FSID_MINOR 0x8000000ULL
89
90	static __be32
91	check_filename(char *str, int len)
92	{
93	int i;
94
95	if (len == 0)
96	return nfserr_inval;
97	if (len > NFS4_MAXNAMLEN)
98	return nfserr_nametoolong;
99	if (isdotent(str, len))
100	return nfserr_badname;
101	for (i = 0; i < len; i++)
102	if (str[i] == '/')
103	return nfserr_badname;
104	return 0;
105	}
106
107	static int zero_clientid(clientid_t *clid)
108	{
109	return (clid->cl_boot == 0) && (clid->cl_id == 0);
110	}
111
112	/**
113	* svcxdr_tmpalloc - allocate memory to be freed after compound processing
114	* @argp: NFSv4 compound argument structure
115	* @len: length of buffer to allocate
116	*
117	* Allocates a buffer of size @len to be freed when processing the compound
118	* operation described in @argp finishes.
119	*/
120	static void *
121	svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
122	{
123	struct svcxdr_tmpbuf *tb;
124
125	tb = kmalloc(size: sizeof(*tb) + len, GFP_KERNEL);
126	if (!tb)
127	return NULL;
128	tb->next = argp->to_free;
129	argp->to_free = tb;
130	return tb->buf;
131	}
132
133	/*
134	* For xdr strings that need to be passed to other kernel api's
135	* as null-terminated strings.
136	*
137	* Note null-terminating in place usually isn't safe since the
138	* buffer might end on a page boundary.
139	*/
140	static char *
141	svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
142	{
143	char *p = svcxdr_tmpalloc(argp, len: len + 1);
144
145	if (!p)
146	return NULL;
147	memcpy(p, buf, len);
148	p[len] = '\0';
149	return p;
150	}
151
152	static void *
153	svcxdr_savemem(struct nfsd4_compoundargs *argp, __be32 *p, u32 len)
154	{
155	__be32 *tmp;
156
157	/*
158	* The location of the decoded data item is stable,
159	* so @p is OK to use. This is the common case.
160	*/
161	if (p != argp->xdr->scratch.iov_base)
162	return p;
163
164	tmp = svcxdr_tmpalloc(argp, len);
165	if (!tmp)
166	return NULL;
167	memcpy(tmp, p, len);
168	return tmp;
169	}
170
171	/*
172	* NFSv4 basic data type decoders
173	*/
174
175	/*
176	* This helper handles variable-length opaques which belong to protocol
177	* elements that this implementation does not support.
178	*/
179	static __be32
180	nfsd4_decode_ignored_string(struct nfsd4_compoundargs *argp, u32 maxlen)
181	{
182	u32 len;
183
184	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &len) < 0)
185	return nfserr_bad_xdr;
186	if (maxlen && len > maxlen)
187	return nfserr_bad_xdr;
188	if (!xdr_inline_decode(xdr: argp->xdr, nbytes: len))
189	return nfserr_bad_xdr;
190
191	return nfs_ok;
192	}
193
194	static __be32
195	nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
196	{
197	__be32 *p;
198	u32 len;
199
200	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &len) < 0)
201	return nfserr_bad_xdr;
202	if (len == 0 || len > NFS4_OPAQUE_LIMIT)
203	return nfserr_bad_xdr;
204	p = xdr_inline_decode(xdr: argp->xdr, nbytes: len);
205	if (!p)
206	return nfserr_bad_xdr;
207	o->data = svcxdr_savemem(argp, p, len);
208	if (!o->data)
209	return nfserr_jukebox;
210	o->len = len;
211
212	return nfs_ok;
213	}
214
215	static __be32
216	nfsd4_decode_component4(struct nfsd4_compoundargs *argp, char **namp, u32 *lenp)
217	{
218	__be32 *p, status;
219
220	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: lenp) < 0)
221	return nfserr_bad_xdr;
222	p = xdr_inline_decode(xdr: argp->xdr, nbytes: *lenp);
223	if (!p)
224	return nfserr_bad_xdr;
225	status = check_filename(str: (char *)p, len: *lenp);
226	if (status)
227	return status;
228	*namp = svcxdr_savemem(argp, p, len: *lenp);
229	if (!*namp)
230	return nfserr_jukebox;
231
232	return nfs_ok;
233	}
234
235	static __be32
236	nfsd4_decode_nfstime4(struct nfsd4_compoundargs *argp, struct timespec64 *tv)
237	{
238	__be32 *p;
239
240	p = xdr_inline_decode(xdr: argp->xdr, XDR_UNIT * 3);
241	if (!p)
242	return nfserr_bad_xdr;
243	p = xdr_decode_hyper(p, valp: &tv->tv_sec);
244	tv->tv_nsec = be32_to_cpup(p: p++);
245	if (tv->tv_nsec >= (u32)1000000000)
246	return nfserr_inval;
247	return nfs_ok;
248	}
249
250	static __be32
251	nfsd4_decode_verifier4(struct nfsd4_compoundargs *argp, nfs4_verifier *verf)
252	{
253	__be32 *p;
254
255	p = xdr_inline_decode(xdr: argp->xdr, NFS4_VERIFIER_SIZE);
256	if (!p)
257	return nfserr_bad_xdr;
258	memcpy(verf->data, p, sizeof(verf->data));
259	return nfs_ok;
260	}
261
262	/**
263	* nfsd4_decode_bitmap4 - Decode an NFSv4 bitmap4
264	* @argp: NFSv4 compound argument structure
265	* @bmval: pointer to an array of u32's to decode into
266	* @bmlen: size of the @bmval array
267	*
268	* The server needs to return nfs_ok rather than nfserr_bad_xdr when
269	* encountering bitmaps containing bits it does not recognize. This
270	* includes bits in bitmap words past WORDn, where WORDn is the last
271	* bitmap WORD the implementation currently supports. Thus we are
272	* careful here to simply ignore bits in bitmap words that this
273	* implementation has yet to support explicitly.
274	*
275	* Return values:
276	* %nfs_ok: @bmval populated successfully
277	* %nfserr_bad_xdr: the encoded bitmap was invalid
278	*/
279	static __be32
280	nfsd4_decode_bitmap4(struct nfsd4_compoundargs *argp, u32 *bmval, u32 bmlen)
281	{
282	ssize_t status;
283
284	status = xdr_stream_decode_uint32_array(xdr: argp->xdr, array: bmval, array_size: bmlen);
285	return status == -EBADMSG ? nfserr_bad_xdr : nfs_ok;
286	}
287
288	static __be32
289	nfsd4_decode_nfsace4(struct nfsd4_compoundargs *argp, struct nfs4_ace *ace)
290	{
291	__be32 *p, status;
292	u32 length;
293
294	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &ace->type) < 0)
295	return nfserr_bad_xdr;
296	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &ace->flag) < 0)
297	return nfserr_bad_xdr;
298	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &ace->access_mask) < 0)
299	return nfserr_bad_xdr;
300
301	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &length) < 0)
302	return nfserr_bad_xdr;
303	p = xdr_inline_decode(xdr: argp->xdr, nbytes: length);
304	if (!p)
305	return nfserr_bad_xdr;
306	ace->whotype = nfs4_acl_get_whotype((char *)p, length);
307	if (ace->whotype != NFS4_ACL_WHO_NAMED)
308	status = nfs_ok;
309	else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
310	status = nfsd_map_name_to_gid(argp->rqstp,
311	(char *)p, length, &ace->who_gid);
312	else
313	status = nfsd_map_name_to_uid(argp->rqstp,
314	(char *)p, length, &ace->who_uid);
315
316	return status;
317	}
318
319	/* A counted array of nfsace4's */
320	static noinline __be32
321	nfsd4_decode_acl(struct nfsd4_compoundargs *argp, struct nfs4_acl **acl)
322	{
323	struct nfs4_ace *ace;
324	__be32 status;
325	u32 count;
326
327	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &count) < 0)
328	return nfserr_bad_xdr;
329
330	if (count > xdr_stream_remaining(xdr: argp->xdr) / 20)
331	/*
332	* Even with 4-byte names there wouldn't be
333	* space for that many aces; something fishy is
334	* going on:
335	*/
336	return nfserr_fbig;
337
338	*acl = svcxdr_tmpalloc(argp, len: nfs4_acl_bytes(entries: count));
339	if (*acl == NULL)
340	return nfserr_jukebox;
341
342	(*acl)->naces = count;
343	for (ace = (*acl)->aces; ace < (*acl)->aces + count; ace++) {
344	status = nfsd4_decode_nfsace4(argp, ace);
345	if (status)
346	return status;
347	}
348
349	return nfs_ok;
350	}
351
352	static noinline __be32
353	nfsd4_decode_security_label(struct nfsd4_compoundargs *argp,
354	struct xdr_netobj *label)
355	{
356	u32 lfs, pi, length;
357	__be32 *p;
358
359	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &lfs) < 0)
360	return nfserr_bad_xdr;
361	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &pi) < 0)
362	return nfserr_bad_xdr;
363
364	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &length) < 0)
365	return nfserr_bad_xdr;
366	if (length > NFS4_MAXLABELLEN)
367	return nfserr_badlabel;
368	p = xdr_inline_decode(xdr: argp->xdr, nbytes: length);
369	if (!p)
370	return nfserr_bad_xdr;
371	label->len = length;
372	label->data = svcxdr_dupstr(argp, buf: p, len: length);
373	if (!label->data)
374	return nfserr_jukebox;
375
376	return nfs_ok;
377	}
378
379	static __be32
380	nfsd4_decode_fattr4(struct nfsd4_compoundargs *argp, u32 *bmval, u32 bmlen,
381	struct iattr *iattr, struct nfs4_acl **acl,
382	struct xdr_netobj *label, int *umask)
383	{
384	unsigned int starting_pos;
385	u32 attrlist4_count;
386	__be32 *p, status;
387
388	iattr->ia_valid = 0;
389	status = nfsd4_decode_bitmap4(argp, bmval, bmlen);
390	if (status)
391	return nfserr_bad_xdr;
392
393	if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
394	|| bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
395	|| bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2) {
396	if (nfsd_attrs_supported(minorversion: argp->minorversion, bmval))
397	return nfserr_inval;
398	return nfserr_attrnotsupp;
399	}
400
401	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &attrlist4_count) < 0)
402	return nfserr_bad_xdr;
403	starting_pos = xdr_stream_pos(xdr: argp->xdr);
404
405	if (bmval[0] & FATTR4_WORD0_SIZE) {
406	u64 size;
407
408	if (xdr_stream_decode_u64(xdr: argp->xdr, ptr: &size) < 0)
409	return nfserr_bad_xdr;
410	iattr->ia_size = size;
411	iattr->ia_valid |= ATTR_SIZE;
412	}
413	if (bmval[0] & FATTR4_WORD0_ACL) {
414	status = nfsd4_decode_acl(argp, acl);
415	if (status)
416	return status;
417	} else
418	*acl = NULL;
419	if (bmval[1] & FATTR4_WORD1_MODE) {
420	u32 mode;
421
422	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &mode) < 0)
423	return nfserr_bad_xdr;
424	iattr->ia_mode = mode;
425	iattr->ia_mode &= (S_IFMT | S_IALLUGO);
426	iattr->ia_valid |= ATTR_MODE;
427	}
428	if (bmval[1] & FATTR4_WORD1_OWNER) {
429	u32 length;
430
431	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &length) < 0)
432	return nfserr_bad_xdr;
433	p = xdr_inline_decode(xdr: argp->xdr, nbytes: length);
434	if (!p)
435	return nfserr_bad_xdr;
436	status = nfsd_map_name_to_uid(argp->rqstp, (char *)p, length,
437	&iattr->ia_uid);
438	if (status)
439	return status;
440	iattr->ia_valid |= ATTR_UID;
441	}
442	if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
443	u32 length;
444
445	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &length) < 0)
446	return nfserr_bad_xdr;
447	p = xdr_inline_decode(xdr: argp->xdr, nbytes: length);
448	if (!p)
449	return nfserr_bad_xdr;
450	status = nfsd_map_name_to_gid(argp->rqstp, (char *)p, length,
451	&iattr->ia_gid);
452	if (status)
453	return status;
454	iattr->ia_valid |= ATTR_GID;
455	}
456	if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
457	u32 set_it;
458
459	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &set_it) < 0)
460	return nfserr_bad_xdr;
461	switch (set_it) {
462	case NFS4_SET_TO_CLIENT_TIME:
463	status = nfsd4_decode_nfstime4(argp, tv: &iattr->ia_atime);
464	if (status)
465	return status;
466	iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
467	break;
468	case NFS4_SET_TO_SERVER_TIME:
469	iattr->ia_valid |= ATTR_ATIME;
470	break;
471	default:
472	return nfserr_bad_xdr;
473	}
474	}
475	if (bmval[1] & FATTR4_WORD1_TIME_CREATE) {
476	struct timespec64 ts;
477
478	/* No Linux filesystem supports setting this attribute. */
479	bmval[1] &= ~FATTR4_WORD1_TIME_CREATE;
480	status = nfsd4_decode_nfstime4(argp, tv: &ts);
481	if (status)
482	return status;
483	}
484	if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
485	u32 set_it;
486
487	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &set_it) < 0)
488	return nfserr_bad_xdr;
489	switch (set_it) {
490	case NFS4_SET_TO_CLIENT_TIME:
491	status = nfsd4_decode_nfstime4(argp, tv: &iattr->ia_mtime);
492	if (status)
493	return status;
494	iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
495	break;
496	case NFS4_SET_TO_SERVER_TIME:
497	iattr->ia_valid |= ATTR_MTIME;
498	break;
499	default:
500	return nfserr_bad_xdr;
501	}
502	}
503	label->len = 0;
504	if (IS_ENABLED(CONFIG_NFSD_V4_SECURITY_LABEL) &&
505	bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
506	status = nfsd4_decode_security_label(argp, label);
507	if (status)
508	return status;
509	}
510	if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
511	u32 mode, mask;
512
513	if (!umask)
514	return nfserr_bad_xdr;
515	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &mode) < 0)
516	return nfserr_bad_xdr;
517	iattr->ia_mode = mode & (S_IFMT | S_IALLUGO);
518	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &mask) < 0)
519	return nfserr_bad_xdr;
520	*umask = mask & S_IRWXUGO;
521	iattr->ia_valid |= ATTR_MODE;
522	}
523
524	/* request sanity: did attrlist4 contain the expected number of words? */
525	if (attrlist4_count != xdr_stream_pos(xdr: argp->xdr) - starting_pos)
526	return nfserr_bad_xdr;
527
528	return nfs_ok;
529	}
530
531	static __be32
532	nfsd4_decode_stateid4(struct nfsd4_compoundargs *argp, stateid_t *sid)
533	{
534	__be32 *p;
535
536	p = xdr_inline_decode(xdr: argp->xdr, NFS4_STATEID_SIZE);
537	if (!p)
538	return nfserr_bad_xdr;
539	sid->si_generation = be32_to_cpup(p: p++);
540	memcpy(&sid->si_opaque, p, sizeof(sid->si_opaque));
541	return nfs_ok;
542	}
543
544	static __be32
545	nfsd4_decode_clientid4(struct nfsd4_compoundargs *argp, clientid_t *clientid)
546	{
547	__be32 *p;
548
549	p = xdr_inline_decode(xdr: argp->xdr, nbytes: sizeof(__be64));
550	if (!p)
551	return nfserr_bad_xdr;
552	memcpy(clientid, p, sizeof(*clientid));
553	return nfs_ok;
554	}
555
556	static __be32
557	nfsd4_decode_state_owner4(struct nfsd4_compoundargs *argp,
558	clientid_t *clientid, struct xdr_netobj *owner)
559	{
560	__be32 status;
561
562	status = nfsd4_decode_clientid4(argp, clientid);
563	if (status)
564	return status;
565	return nfsd4_decode_opaque(argp, o: owner);
566	}
567
568	#ifdef CONFIG_NFSD_PNFS
569	static __be32
570	nfsd4_decode_deviceid4(struct nfsd4_compoundargs *argp,
571	struct nfsd4_deviceid *devid)
572	{
573	__be32 *p;
574
575	p = xdr_inline_decode(xdr: argp->xdr, NFS4_DEVICEID4_SIZE);
576	if (!p)
577	return nfserr_bad_xdr;
578	memcpy(devid, p, sizeof(*devid));
579	return nfs_ok;
580	}
581
582	static __be32
583	nfsd4_decode_layoutupdate4(struct nfsd4_compoundargs *argp,
584	struct nfsd4_layoutcommit *lcp)
585	{
586	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &lcp->lc_layout_type) < 0)
587	return nfserr_bad_xdr;
588	if (lcp->lc_layout_type < LAYOUT_NFSV4_1_FILES)
589	return nfserr_bad_xdr;
590	if (lcp->lc_layout_type >= LAYOUT_TYPE_MAX)
591	return nfserr_bad_xdr;
592
593	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &lcp->lc_up_len) < 0)
594	return nfserr_bad_xdr;
595	if (lcp->lc_up_len > 0) {
596	lcp->lc_up_layout = xdr_inline_decode(xdr: argp->xdr, nbytes: lcp->lc_up_len);
597	if (!lcp->lc_up_layout)
598	return nfserr_bad_xdr;
599	}
600
601	return nfs_ok;
602	}
603
604	static __be32
605	nfsd4_decode_layoutreturn4(struct nfsd4_compoundargs *argp,
606	struct nfsd4_layoutreturn *lrp)
607	{
608	__be32 status;
609
610	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &lrp->lr_return_type) < 0)
611	return nfserr_bad_xdr;
612	switch (lrp->lr_return_type) {
613	case RETURN_FILE:
614	if (xdr_stream_decode_u64(xdr: argp->xdr, ptr: &lrp->lr_seg.offset) < 0)
615	return nfserr_bad_xdr;
616	if (xdr_stream_decode_u64(xdr: argp->xdr, ptr: &lrp->lr_seg.length) < 0)
617	return nfserr_bad_xdr;
618	status = nfsd4_decode_stateid4(argp, sid: &lrp->lr_sid);
619	if (status)
620	return status;
621	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &lrp->lrf_body_len) < 0)
622	return nfserr_bad_xdr;
623	if (lrp->lrf_body_len > 0) {
624	lrp->lrf_body = xdr_inline_decode(xdr: argp->xdr, nbytes: lrp->lrf_body_len);
625	if (!lrp->lrf_body)
626	return nfserr_bad_xdr;
627	}
628	break;
629	case RETURN_FSID:
630	case RETURN_ALL:
631	lrp->lr_seg.offset = 0;
632	lrp->lr_seg.length = NFS4_MAX_UINT64;
633	break;
634	default:
635	return nfserr_bad_xdr;
636	}
637
638	return nfs_ok;
639	}
640
641	#endif /* CONFIG_NFSD_PNFS */
642
643	static __be32
644	nfsd4_decode_sessionid4(struct nfsd4_compoundargs *argp,
645	struct nfs4_sessionid *sessionid)
646	{
647	__be32 *p;
648
649	p = xdr_inline_decode(xdr: argp->xdr, NFS4_MAX_SESSIONID_LEN);
650	if (!p)
651	return nfserr_bad_xdr;
652	memcpy(sessionid->data, p, sizeof(sessionid->data));
653	return nfs_ok;
654	}
655
656	/* Defined in Appendix A of RFC 5531 */
657	static __be32
658	nfsd4_decode_authsys_parms(struct nfsd4_compoundargs *argp,
659	struct nfsd4_cb_sec *cbs)
660	{
661	u32 stamp, gidcount, uid, gid;
662	__be32 *p, status;
663
664	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &stamp) < 0)
665	return nfserr_bad_xdr;
666	/* machine name */
667	status = nfsd4_decode_ignored_string(argp, maxlen: 255);
668	if (status)
669	return status;
670	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &uid) < 0)
671	return nfserr_bad_xdr;
672	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &gid) < 0)
673	return nfserr_bad_xdr;
674	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &gidcount) < 0)
675	return nfserr_bad_xdr;
676	if (gidcount > 16)
677	return nfserr_bad_xdr;
678	p = xdr_inline_decode(xdr: argp->xdr, nbytes: gidcount << 2);
679	if (!p)
680	return nfserr_bad_xdr;
681	if (cbs->flavor == (u32)(-1)) {
682	struct user_namespace *userns = nfsd_user_namespace(rqstp: argp->rqstp);
683
684	kuid_t kuid = make_kuid(from: userns, uid);
685	kgid_t kgid = make_kgid(from: userns, gid);
686	if (uid_valid(uid: kuid) && gid_valid(gid: kgid)) {
687	cbs->uid = kuid;
688	cbs->gid = kgid;
689	cbs->flavor = RPC_AUTH_UNIX;
690	} else {
691	dprintk("RPC_AUTH_UNIX with invalid uid or gid, ignoring!\n");
692	}
693	}
694
695	return nfs_ok;
696	}
697
698	static __be32
699	nfsd4_decode_gss_cb_handles4(struct nfsd4_compoundargs *argp,
700	struct nfsd4_cb_sec *cbs)
701	{
702	__be32 status;
703	u32 service;
704
705	dprintk("RPC_AUTH_GSS callback secflavor not supported!\n");
706
707	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &service) < 0)
708	return nfserr_bad_xdr;
709	if (service < RPC_GSS_SVC_NONE || service > RPC_GSS_SVC_PRIVACY)
710	return nfserr_bad_xdr;
711	/* gcbp_handle_from_server */
712	status = nfsd4_decode_ignored_string(argp, maxlen: 0);
713	if (status)
714	return status;
715	/* gcbp_handle_from_client */
716	status = nfsd4_decode_ignored_string(argp, maxlen: 0);
717	if (status)
718	return status;
719
720	return nfs_ok;
721	}
722
723	/* a counted array of callback_sec_parms4 items */
724	static __be32
725	nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
726	{
727	u32 i, secflavor, nr_secflavs;
728	__be32 status;
729
730	/* callback_sec_params4 */
731	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &nr_secflavs) < 0)
732	return nfserr_bad_xdr;
733	if (nr_secflavs)
734	cbs->flavor = (u32)(-1);
735	else
736	/* Is this legal? Be generous, take it to mean AUTH_NONE: */
737	cbs->flavor = 0;
738
739	for (i = 0; i < nr_secflavs; ++i) {
740	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &secflavor) < 0)
741	return nfserr_bad_xdr;
742	switch (secflavor) {
743	case RPC_AUTH_NULL:
744	/* void */
745	if (cbs->flavor == (u32)(-1))
746	cbs->flavor = RPC_AUTH_NULL;
747	break;
748	case RPC_AUTH_UNIX:
749	status = nfsd4_decode_authsys_parms(argp, cbs);
750	if (status)
751	return status;
752	break;
753	case RPC_AUTH_GSS:
754	status = nfsd4_decode_gss_cb_handles4(argp, cbs);
755	if (status)
756	return status;
757	break;
758	default:
759	return nfserr_inval;
760	}
761	}
762
763	return nfs_ok;
764	}
765
766
767	/*
768	* NFSv4 operation argument decoders
769	*/
770
771	static __be32
772	nfsd4_decode_access(struct nfsd4_compoundargs *argp,
773	union nfsd4_op_u *u)
774	{
775	struct nfsd4_access *access = &u->access;
776	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &access->ac_req_access) < 0)
777	return nfserr_bad_xdr;
778	return nfs_ok;
779	}
780
781	static __be32
782	nfsd4_decode_close(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
783	{
784	struct nfsd4_close *close = &u->close;
785	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &close->cl_seqid) < 0)
786	return nfserr_bad_xdr;
787	return nfsd4_decode_stateid4(argp, sid: &close->cl_stateid);
788	}
789
790
791	static __be32
792	nfsd4_decode_commit(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
793	{
794	struct nfsd4_commit *commit = &u->commit;
795	if (xdr_stream_decode_u64(xdr: argp->xdr, ptr: &commit->co_offset) < 0)
796	return nfserr_bad_xdr;
797	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &commit->co_count) < 0)
798	return nfserr_bad_xdr;
799	memset(&commit->co_verf, 0, sizeof(commit->co_verf));
800	return nfs_ok;
801	}
802
803	static __be32
804	nfsd4_decode_create(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
805	{
806	struct nfsd4_create *create = &u->create;
807	__be32 *p, status;
808
809	memset(create, 0, sizeof(*create));
810	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &create->cr_type) < 0)
811	return nfserr_bad_xdr;
812	switch (create->cr_type) {
813	case NF4LNK:
814	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &create->cr_datalen) < 0)
815	return nfserr_bad_xdr;
816	p = xdr_inline_decode(xdr: argp->xdr, nbytes: create->cr_datalen);
817	if (!p)
818	return nfserr_bad_xdr;
819	create->cr_data = svcxdr_dupstr(argp, buf: p, len: create->cr_datalen);
820	if (!create->cr_data)
821	return nfserr_jukebox;
822	break;
823	case NF4BLK:
824	case NF4CHR:
825	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &create->cr_specdata1) < 0)
826	return nfserr_bad_xdr;
827	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &create->cr_specdata2) < 0)
828	return nfserr_bad_xdr;
829	break;
830	case NF4SOCK:
831	case NF4FIFO:
832	case NF4DIR:
833	default:
834	break;
835	}
836	status = nfsd4_decode_component4(argp, namp: &create->cr_name,
837	lenp: &create->cr_namelen);
838	if (status)
839	return status;
840	status = nfsd4_decode_fattr4(argp, bmval: create->cr_bmval,
841	ARRAY_SIZE(create->cr_bmval),
842	iattr: &create->cr_iattr, acl: &create->cr_acl,
843	label: &create->cr_label, umask: &create->cr_umask);
844	if (status)
845	return status;
846
847	return nfs_ok;
848	}
849
850	static inline __be32
851	nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
852	{
853	struct nfsd4_delegreturn *dr = &u->delegreturn;
854	return nfsd4_decode_stateid4(argp, sid: &dr->dr_stateid);
855	}
856
857	static inline __be32
858	nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
859	{
860	struct nfsd4_getattr *getattr = &u->getattr;
861	memset(getattr, 0, sizeof(*getattr));
862	return nfsd4_decode_bitmap4(argp, bmval: getattr->ga_bmval,
863	ARRAY_SIZE(getattr->ga_bmval));
864	}
865
866	static __be32
867	nfsd4_decode_link(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
868	{
869	struct nfsd4_link *link = &u->link;
870	memset(link, 0, sizeof(*link));
871	return nfsd4_decode_component4(argp, namp: &link->li_name, lenp: &link->li_namelen);
872	}
873
874	static __be32
875	nfsd4_decode_open_to_lock_owner4(struct nfsd4_compoundargs *argp,
876	struct nfsd4_lock *lock)
877	{
878	__be32 status;
879
880	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &lock->lk_new_open_seqid) < 0)
881	return nfserr_bad_xdr;
882	status = nfsd4_decode_stateid4(argp, sid: &lock->lk_new_open_stateid);
883	if (status)
884	return status;
885	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &lock->lk_new_lock_seqid) < 0)
886	return nfserr_bad_xdr;
887	return nfsd4_decode_state_owner4(argp, clientid: &lock->lk_new_clientid,
888	owner: &lock->lk_new_owner);
889	}
890
891	static __be32
892	nfsd4_decode_exist_lock_owner4(struct nfsd4_compoundargs *argp,
893	struct nfsd4_lock *lock)
894	{
895	__be32 status;
896
897	status = nfsd4_decode_stateid4(argp, sid: &lock->lk_old_lock_stateid);
898	if (status)
899	return status;
900	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &lock->lk_old_lock_seqid) < 0)
901	return nfserr_bad_xdr;
902
903	return nfs_ok;
904	}
905
906	static __be32
907	nfsd4_decode_locker4(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
908	{
909	if (xdr_stream_decode_bool(xdr: argp->xdr, ptr: &lock->lk_is_new) < 0)
910	return nfserr_bad_xdr;
911	if (lock->lk_is_new)
912	return nfsd4_decode_open_to_lock_owner4(argp, lock);
913	return nfsd4_decode_exist_lock_owner4(argp, lock);
914	}
915
916	static __be32
917	nfsd4_decode_lock(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
918	{
919	struct nfsd4_lock *lock = &u->lock;
920	memset(lock, 0, sizeof(*lock));
921	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &lock->lk_type) < 0)
922	return nfserr_bad_xdr;
923	if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
924	return nfserr_bad_xdr;
925	if (xdr_stream_decode_bool(xdr: argp->xdr, ptr: &lock->lk_reclaim) < 0)
926	return nfserr_bad_xdr;
927	if (xdr_stream_decode_u64(xdr: argp->xdr, ptr: &lock->lk_offset) < 0)
928	return nfserr_bad_xdr;
929	if (xdr_stream_decode_u64(xdr: argp->xdr, ptr: &lock->lk_length) < 0)
930	return nfserr_bad_xdr;
931	return nfsd4_decode_locker4(argp, lock);
932	}
933
934	static __be32
935	nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
936	{
937	struct nfsd4_lockt *lockt = &u->lockt;
938	memset(lockt, 0, sizeof(*lockt));
939	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &lockt->lt_type) < 0)
940	return nfserr_bad_xdr;
941	if ((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
942	return nfserr_bad_xdr;
943	if (xdr_stream_decode_u64(xdr: argp->xdr, ptr: &lockt->lt_offset) < 0)
944	return nfserr_bad_xdr;
945	if (xdr_stream_decode_u64(xdr: argp->xdr, ptr: &lockt->lt_length) < 0)
946	return nfserr_bad_xdr;
947	return nfsd4_decode_state_owner4(argp, clientid: &lockt->lt_clientid,
948	owner: &lockt->lt_owner);
949	}
950
951	static __be32
952	nfsd4_decode_locku(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
953	{
954	struct nfsd4_locku *locku = &u->locku;
955	__be32 status;
956
957	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &locku->lu_type) < 0)
958	return nfserr_bad_xdr;
959	if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
960	return nfserr_bad_xdr;
961	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &locku->lu_seqid) < 0)
962	return nfserr_bad_xdr;
963	status = nfsd4_decode_stateid4(argp, sid: &locku->lu_stateid);
964	if (status)
965	return status;
966	if (xdr_stream_decode_u64(xdr: argp->xdr, ptr: &locku->lu_offset) < 0)
967	return nfserr_bad_xdr;
968	if (xdr_stream_decode_u64(xdr: argp->xdr, ptr: &locku->lu_length) < 0)
969	return nfserr_bad_xdr;
970
971	return nfs_ok;
972	}
973
974	static __be32
975	nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
976	{
977	struct nfsd4_lookup *lookup = &u->lookup;
978	return nfsd4_decode_component4(argp, namp: &lookup->lo_name, lenp: &lookup->lo_len);
979	}
980
981	static __be32
982	nfsd4_decode_createhow4(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
983	{
984	__be32 status;
985
986	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &open->op_createmode) < 0)
987	return nfserr_bad_xdr;
988	switch (open->op_createmode) {
989	case NFS4_CREATE_UNCHECKED:
990	case NFS4_CREATE_GUARDED:
991	status = nfsd4_decode_fattr4(argp, bmval: open->op_bmval,
992	ARRAY_SIZE(open->op_bmval),
993	iattr: &open->op_iattr, acl: &open->op_acl,
994	label: &open->op_label, umask: &open->op_umask);
995	if (status)
996	return status;
997	break;
998	case NFS4_CREATE_EXCLUSIVE:
999	status = nfsd4_decode_verifier4(argp, verf: &open->op_verf);
1000	if (status)
1001	return status;
1002	break;
1003	case NFS4_CREATE_EXCLUSIVE4_1:
1004	if (argp->minorversion < 1)
1005	return nfserr_bad_xdr;
1006	status = nfsd4_decode_verifier4(argp, verf: &open->op_verf);
1007	if (status)
1008	return status;
1009	status = nfsd4_decode_fattr4(argp, bmval: open->op_bmval,
1010	ARRAY_SIZE(open->op_bmval),
1011	iattr: &open->op_iattr, acl: &open->op_acl,
1012	label: &open->op_label, umask: &open->op_umask);
1013	if (status)
1014	return status;
1015	break;
1016	default:
1017	return nfserr_bad_xdr;
1018	}
1019
1020	return nfs_ok;
1021	}
1022
1023	static __be32
1024	nfsd4_decode_openflag4(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
1025	{
1026	__be32 status;
1027
1028	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &open->op_create) < 0)
1029	return nfserr_bad_xdr;
1030	switch (open->op_create) {
1031	case NFS4_OPEN_NOCREATE:
1032	break;
1033	case NFS4_OPEN_CREATE:
1034	status = nfsd4_decode_createhow4(argp, open);
1035	if (status)
1036	return status;
1037	break;
1038	default:
1039	return nfserr_bad_xdr;
1040	}
1041
1042	return nfs_ok;
1043	}
1044
1045	static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
1046	{
1047	u32 w;
1048
1049	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &w) < 0)
1050	return nfserr_bad_xdr;
1051	*share_access = w & NFS4_SHARE_ACCESS_MASK;
1052	*deleg_want = w & NFS4_SHARE_WANT_MASK;
1053	if (deleg_when)
1054	*deleg_when = w & NFS4_SHARE_WHEN_MASK;
1055
1056	switch (w & NFS4_SHARE_ACCESS_MASK) {
1057	case NFS4_SHARE_ACCESS_READ:
1058	case NFS4_SHARE_ACCESS_WRITE:
1059	case NFS4_SHARE_ACCESS_BOTH:
1060	break;
1061	default:
1062	return nfserr_bad_xdr;
1063	}
1064	w &= ~NFS4_SHARE_ACCESS_MASK;
1065	if (!w)
1066	return nfs_ok;
1067	if (!argp->minorversion)
1068	return nfserr_bad_xdr;
1069	switch (w & NFS4_SHARE_WANT_MASK) {
1070	case NFS4_SHARE_WANT_NO_PREFERENCE:
1071	case NFS4_SHARE_WANT_READ_DELEG:
1072	case NFS4_SHARE_WANT_WRITE_DELEG:
1073	case NFS4_SHARE_WANT_ANY_DELEG:
1074	case NFS4_SHARE_WANT_NO_DELEG:
1075	case NFS4_SHARE_WANT_CANCEL:
1076	break;
1077	default:
1078	return nfserr_bad_xdr;
1079	}
1080	w &= ~NFS4_SHARE_WANT_MASK;
1081	if (!w)
1082	return nfs_ok;
1083
1084	if (!deleg_when) /* open_downgrade */
1085	return nfserr_inval;
1086	switch (w) {
1087	case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
1088	case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
1089	case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
1090	NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
1091	return nfs_ok;
1092	}
1093	return nfserr_bad_xdr;
1094	}
1095
1096	static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
1097	{
1098	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: x) < 0)
1099	return nfserr_bad_xdr;
1100	/* Note: unlike access bits, deny bits may be zero. */
1101	if (*x & ~NFS4_SHARE_DENY_BOTH)
1102	return nfserr_bad_xdr;
1103
1104	return nfs_ok;
1105	}
1106
1107	static __be32
1108	nfsd4_decode_open_claim4(struct nfsd4_compoundargs *argp,
1109	struct nfsd4_open *open)
1110	{
1111	__be32 status;
1112
1113	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &open->op_claim_type) < 0)
1114	return nfserr_bad_xdr;
1115	switch (open->op_claim_type) {
1116	case NFS4_OPEN_CLAIM_NULL:
1117	case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1118	status = nfsd4_decode_component4(argp, namp: &open->op_fname,
1119	lenp: &open->op_fnamelen);
1120	if (status)
1121	return status;
1122	break;
1123	case NFS4_OPEN_CLAIM_PREVIOUS:
1124	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &open->op_delegate_type) < 0)
1125	return nfserr_bad_xdr;
1126	break;
1127	case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1128	status = nfsd4_decode_stateid4(argp, sid: &open->op_delegate_stateid);
1129	if (status)
1130	return status;
1131	status = nfsd4_decode_component4(argp, namp: &open->op_fname,
1132	lenp: &open->op_fnamelen);
1133	if (status)
1134	return status;
1135	break;
1136	case NFS4_OPEN_CLAIM_FH:
1137	case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1138	if (argp->minorversion < 1)
1139	return nfserr_bad_xdr;
1140	/* void */
1141	break;
1142	case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1143	if (argp->minorversion < 1)
1144	return nfserr_bad_xdr;
1145	status = nfsd4_decode_stateid4(argp, sid: &open->op_delegate_stateid);
1146	if (status)
1147	return status;
1148	break;
1149	default:
1150	return nfserr_bad_xdr;
1151	}
1152
1153	return nfs_ok;
1154	}
1155
1156	static __be32
1157	nfsd4_decode_open(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1158	{
1159	struct nfsd4_open *open = &u->open;
1160	__be32 status;
1161	u32 dummy;
1162
1163	memset(open, 0, sizeof(*open));
1164
1165	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &open->op_seqid) < 0)
1166	return nfserr_bad_xdr;
1167	/* deleg_want is ignored */
1168	status = nfsd4_decode_share_access(argp, share_access: &open->op_share_access,
1169	deleg_want: &open->op_deleg_want, deleg_when: &dummy);
1170	if (status)
1171	return status;
1172	status = nfsd4_decode_share_deny(argp, x: &open->op_share_deny);
1173	if (status)
1174	return status;
1175	status = nfsd4_decode_state_owner4(argp, clientid: &open->op_clientid,
1176	owner: &open->op_owner);
1177	if (status)
1178	return status;
1179	status = nfsd4_decode_openflag4(argp, open);
1180	if (status)
1181	return status;
1182	return nfsd4_decode_open_claim4(argp, open);
1183	}
1184
1185	static __be32
1186	nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp,
1187	union nfsd4_op_u *u)
1188	{
1189	struct nfsd4_open_confirm *open_conf = &u->open_confirm;
1190	__be32 status;
1191
1192	if (argp->minorversion >= 1)
1193	return nfserr_notsupp;
1194
1195	status = nfsd4_decode_stateid4(argp, sid: &open_conf->oc_req_stateid);
1196	if (status)
1197	return status;
1198	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &open_conf->oc_seqid) < 0)
1199	return nfserr_bad_xdr;
1200
1201	memset(&open_conf->oc_resp_stateid, 0,
1202	sizeof(open_conf->oc_resp_stateid));
1203	return nfs_ok;
1204	}
1205
1206	static __be32
1207	nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp,
1208	union nfsd4_op_u *u)
1209	{
1210	struct nfsd4_open_downgrade *open_down = &u->open_downgrade;
1211	__be32 status;
1212
1213	memset(open_down, 0, sizeof(*open_down));
1214	status = nfsd4_decode_stateid4(argp, sid: &open_down->od_stateid);
1215	if (status)
1216	return status;
1217	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &open_down->od_seqid) < 0)
1218	return nfserr_bad_xdr;
1219	/* deleg_want is ignored */
1220	status = nfsd4_decode_share_access(argp, share_access: &open_down->od_share_access,
1221	deleg_want: &open_down->od_deleg_want, NULL);
1222	if (status)
1223	return status;
1224	return nfsd4_decode_share_deny(argp, x: &open_down->od_share_deny);
1225	}
1226
1227	static __be32
1228	nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1229	{
1230	struct nfsd4_putfh *putfh = &u->putfh;
1231	__be32 *p;
1232
1233	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &putfh->pf_fhlen) < 0)
1234	return nfserr_bad_xdr;
1235	if (putfh->pf_fhlen > NFS4_FHSIZE)
1236	return nfserr_bad_xdr;
1237	p = xdr_inline_decode(xdr: argp->xdr, nbytes: putfh->pf_fhlen);
1238	if (!p)
1239	return nfserr_bad_xdr;
1240	putfh->pf_fhval = svcxdr_savemem(argp, p, len: putfh->pf_fhlen);
1241	if (!putfh->pf_fhval)
1242	return nfserr_jukebox;
1243
1244	putfh->no_verify = false;
1245	return nfs_ok;
1246	}
1247
1248	static __be32
1249	nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, union nfsd4_op_u *p)
1250	{
1251	if (argp->minorversion == 0)
1252	return nfs_ok;
1253	return nfserr_notsupp;
1254	}
1255
1256	static __be32
1257	nfsd4_decode_read(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1258	{
1259	struct nfsd4_read *read = &u->read;
1260	__be32 status;
1261
1262	memset(read, 0, sizeof(*read));
1263	status = nfsd4_decode_stateid4(argp, sid: &read->rd_stateid);
1264	if (status)
1265	return status;
1266	if (xdr_stream_decode_u64(xdr: argp->xdr, ptr: &read->rd_offset) < 0)
1267	return nfserr_bad_xdr;
1268	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &read->rd_length) < 0)
1269	return nfserr_bad_xdr;
1270
1271	return nfs_ok;
1272	}
1273
1274	static __be32
1275	nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1276	{
1277	struct nfsd4_readdir *readdir = &u->readdir;
1278	__be32 status;
1279
1280	memset(readdir, 0, sizeof(*readdir));
1281	if (xdr_stream_decode_u64(xdr: argp->xdr, ptr: &readdir->rd_cookie) < 0)
1282	return nfserr_bad_xdr;
1283	status = nfsd4_decode_verifier4(argp, verf: &readdir->rd_verf);
1284	if (status)
1285	return status;
1286	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &readdir->rd_dircount) < 0)
1287	return nfserr_bad_xdr;
1288	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &readdir->rd_maxcount) < 0)
1289	return nfserr_bad_xdr;
1290	if (xdr_stream_decode_uint32_array(xdr: argp->xdr, array: readdir->rd_bmval,
1291	ARRAY_SIZE(readdir->rd_bmval)) < 0)
1292	return nfserr_bad_xdr;
1293
1294	return nfs_ok;
1295	}
1296
1297	static __be32
1298	nfsd4_decode_remove(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1299	{
1300	struct nfsd4_remove *remove = &u->remove;
1301	memset(&remove->rm_cinfo, 0, sizeof(remove->rm_cinfo));
1302	return nfsd4_decode_component4(argp, namp: &remove->rm_name, lenp: &remove->rm_namelen);
1303	}
1304
1305	static __be32
1306	nfsd4_decode_rename(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1307	{
1308	struct nfsd4_rename *rename = &u->rename;
1309	__be32 status;
1310
1311	memset(rename, 0, sizeof(*rename));
1312	status = nfsd4_decode_component4(argp, namp: &rename->rn_sname, lenp: &rename->rn_snamelen);
1313	if (status)
1314	return status;
1315	return nfsd4_decode_component4(argp, namp: &rename->rn_tname, lenp: &rename->rn_tnamelen);
1316	}
1317
1318	static __be32
1319	nfsd4_decode_renew(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1320	{
1321	clientid_t *clientid = &u->renew;
1322	return nfsd4_decode_clientid4(argp, clientid);
1323	}
1324
1325	static __be32
1326	nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1327	union nfsd4_op_u *u)
1328	{
1329	struct nfsd4_secinfo *secinfo = &u->secinfo;
1330	secinfo->si_exp = NULL;
1331	return nfsd4_decode_component4(argp, namp: &secinfo->si_name, lenp: &secinfo->si_namelen);
1332	}
1333
1334	static __be32
1335	nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1336	{
1337	struct nfsd4_setattr *setattr = &u->setattr;
1338	__be32 status;
1339
1340	memset(setattr, 0, sizeof(*setattr));
1341	status = nfsd4_decode_stateid4(argp, sid: &setattr->sa_stateid);
1342	if (status)
1343	return status;
1344	return nfsd4_decode_fattr4(argp, bmval: setattr->sa_bmval,
1345	ARRAY_SIZE(setattr->sa_bmval),
1346	iattr: &setattr->sa_iattr, acl: &setattr->sa_acl,
1347	label: &setattr->sa_label, NULL);
1348	}
1349
1350	static __be32
1351	nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1352	{
1353	struct nfsd4_setclientid *setclientid = &u->setclientid;
1354	__be32 *p, status;
1355
1356	memset(setclientid, 0, sizeof(*setclientid));
1357
1358	if (argp->minorversion >= 1)
1359	return nfserr_notsupp;
1360
1361	status = nfsd4_decode_verifier4(argp, verf: &setclientid->se_verf);
1362	if (status)
1363	return status;
1364	status = nfsd4_decode_opaque(argp, o: &setclientid->se_name);
1365	if (status)
1366	return status;
1367	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &setclientid->se_callback_prog) < 0)
1368	return nfserr_bad_xdr;
1369	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &setclientid->se_callback_netid_len) < 0)
1370	return nfserr_bad_xdr;
1371	p = xdr_inline_decode(xdr: argp->xdr, nbytes: setclientid->se_callback_netid_len);
1372	if (!p)
1373	return nfserr_bad_xdr;
1374	setclientid->se_callback_netid_val = svcxdr_savemem(argp, p,
1375	len: setclientid->se_callback_netid_len);
1376	if (!setclientid->se_callback_netid_val)
1377	return nfserr_jukebox;
1378
1379	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &setclientid->se_callback_addr_len) < 0)
1380	return nfserr_bad_xdr;
1381	p = xdr_inline_decode(xdr: argp->xdr, nbytes: setclientid->se_callback_addr_len);
1382	if (!p)
1383	return nfserr_bad_xdr;
1384	setclientid->se_callback_addr_val = svcxdr_savemem(argp, p,
1385	len: setclientid->se_callback_addr_len);
1386	if (!setclientid->se_callback_addr_val)
1387	return nfserr_jukebox;
1388	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &setclientid->se_callback_ident) < 0)
1389	return nfserr_bad_xdr;
1390
1391	return nfs_ok;
1392	}
1393
1394	static __be32
1395	nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp,
1396	union nfsd4_op_u *u)
1397	{
1398	struct nfsd4_setclientid_confirm *scd_c = &u->setclientid_confirm;
1399	__be32 status;
1400
1401	if (argp->minorversion >= 1)
1402	return nfserr_notsupp;
1403
1404	status = nfsd4_decode_clientid4(argp, clientid: &scd_c->sc_clientid);
1405	if (status)
1406	return status;
1407	return nfsd4_decode_verifier4(argp, verf: &scd_c->sc_confirm);
1408	}
1409
1410	/* Also used for NVERIFY */
1411	static __be32
1412	nfsd4_decode_verify(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1413	{
1414	struct nfsd4_verify *verify = &u->verify;
1415	__be32 *p, status;
1416
1417	memset(verify, 0, sizeof(*verify));
1418
1419	status = nfsd4_decode_bitmap4(argp, bmval: verify->ve_bmval,
1420	ARRAY_SIZE(verify->ve_bmval));
1421	if (status)
1422	return status;
1423
1424	/* For convenience's sake, we compare raw xdr'd attributes in
1425	* nfsd4_proc_verify */
1426
1427	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &verify->ve_attrlen) < 0)
1428	return nfserr_bad_xdr;
1429	p = xdr_inline_decode(xdr: argp->xdr, nbytes: verify->ve_attrlen);
1430	if (!p)
1431	return nfserr_bad_xdr;
1432	verify->ve_attrval = svcxdr_savemem(argp, p, len: verify->ve_attrlen);
1433	if (!verify->ve_attrval)
1434	return nfserr_jukebox;
1435
1436	return nfs_ok;
1437	}
1438
1439	static __be32
1440	nfsd4_decode_write(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1441	{
1442	struct nfsd4_write *write = &u->write;
1443	__be32 status;
1444
1445	status = nfsd4_decode_stateid4(argp, sid: &write->wr_stateid);
1446	if (status)
1447	return status;
1448	if (xdr_stream_decode_u64(xdr: argp->xdr, ptr: &write->wr_offset) < 0)
1449	return nfserr_bad_xdr;
1450	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &write->wr_stable_how) < 0)
1451	return nfserr_bad_xdr;
1452	if (write->wr_stable_how > NFS_FILE_SYNC)
1453	return nfserr_bad_xdr;
1454	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &write->wr_buflen) < 0)
1455	return nfserr_bad_xdr;
1456	if (!xdr_stream_subsegment(xdr: argp->xdr, subbuf: &write->wr_payload, len: write->wr_buflen))
1457	return nfserr_bad_xdr;
1458
1459	write->wr_bytes_written = 0;
1460	write->wr_how_written = 0;
1461	memset(&write->wr_verifier, 0, sizeof(write->wr_verifier));
1462	return nfs_ok;
1463	}
1464
1465	static __be32
1466	nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp,
1467	union nfsd4_op_u *u)
1468	{
1469	struct nfsd4_release_lockowner *rlockowner = &u->release_lockowner;
1470	__be32 status;
1471
1472	if (argp->minorversion >= 1)
1473	return nfserr_notsupp;
1474
1475	status = nfsd4_decode_state_owner4(argp, clientid: &rlockowner->rl_clientid,
1476	owner: &rlockowner->rl_owner);
1477	if (status)
1478	return status;
1479
1480	if (argp->minorversion && !zero_clientid(clid: &rlockowner->rl_clientid))
1481	return nfserr_inval;
1482
1483	return nfs_ok;
1484	}
1485
1486	static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp,
1487	union nfsd4_op_u *u)
1488	{
1489	struct nfsd4_backchannel_ctl *bc = &u->backchannel_ctl;
1490	memset(bc, 0, sizeof(*bc));
1491	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &bc->bc_cb_program) < 0)
1492	return nfserr_bad_xdr;
1493	return nfsd4_decode_cb_sec(argp, cbs: &bc->bc_cb_sec);
1494	}
1495
1496	static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp,
1497	union nfsd4_op_u *u)
1498	{
1499	struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
1500	u32 use_conn_in_rdma_mode;
1501	__be32 status;
1502
1503	memset(bcts, 0, sizeof(*bcts));
1504	status = nfsd4_decode_sessionid4(argp, sessionid: &bcts->sessionid);
1505	if (status)
1506	return status;
1507	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &bcts->dir) < 0)
1508	return nfserr_bad_xdr;
1509	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &use_conn_in_rdma_mode) < 0)
1510	return nfserr_bad_xdr;
1511
1512	return nfs_ok;
1513	}
1514
1515	static __be32
1516	nfsd4_decode_state_protect_ops(struct nfsd4_compoundargs *argp,
1517	struct nfsd4_exchange_id *exid)
1518	{
1519	__be32 status;
1520
1521	status = nfsd4_decode_bitmap4(argp, bmval: exid->spo_must_enforce,
1522	ARRAY_SIZE(exid->spo_must_enforce));
1523	if (status)
1524	return nfserr_bad_xdr;
1525	status = nfsd4_decode_bitmap4(argp, bmval: exid->spo_must_allow,
1526	ARRAY_SIZE(exid->spo_must_allow));
1527	if (status)
1528	return nfserr_bad_xdr;
1529
1530	return nfs_ok;
1531	}
1532
1533	/*
1534	* This implementation currently does not support SP4_SSV.
1535	* This decoder simply skips over these arguments.
1536	*/
1537	static noinline __be32
1538	nfsd4_decode_ssv_sp_parms(struct nfsd4_compoundargs *argp,
1539	struct nfsd4_exchange_id *exid)
1540	{
1541	u32 count, window, num_gss_handles;
1542	__be32 status;
1543
1544	/* ssp_ops */
1545	status = nfsd4_decode_state_protect_ops(argp, exid);
1546	if (status)
1547	return status;
1548
1549	/* ssp_hash_algs<> */
1550	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &count) < 0)
1551	return nfserr_bad_xdr;
1552	while (count--) {
1553	status = nfsd4_decode_ignored_string(argp, maxlen: 0);
1554	if (status)
1555	return status;
1556	}
1557
1558	/* ssp_encr_algs<> */
1559	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &count) < 0)
1560	return nfserr_bad_xdr;
1561	while (count--) {
1562	status = nfsd4_decode_ignored_string(argp, maxlen: 0);
1563	if (status)
1564	return status;
1565	}
1566
1567	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &window) < 0)
1568	return nfserr_bad_xdr;
1569	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &num_gss_handles) < 0)
1570	return nfserr_bad_xdr;
1571
1572	return nfs_ok;
1573	}
1574
1575	static __be32
1576	nfsd4_decode_state_protect4_a(struct nfsd4_compoundargs *argp,
1577	struct nfsd4_exchange_id *exid)
1578	{
1579	__be32 status;
1580
1581	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &exid->spa_how) < 0)
1582	return nfserr_bad_xdr;
1583	switch (exid->spa_how) {
1584	case SP4_NONE:
1585	break;
1586	case SP4_MACH_CRED:
1587	status = nfsd4_decode_state_protect_ops(argp, exid);
1588	if (status)
1589	return status;
1590	break;
1591	case SP4_SSV:
1592	status = nfsd4_decode_ssv_sp_parms(argp, exid);
1593	if (status)
1594	return status;
1595	break;
1596	default:
1597	return nfserr_bad_xdr;
1598	}
1599
1600	return nfs_ok;
1601	}
1602
1603	static __be32
1604	nfsd4_decode_nfs_impl_id4(struct nfsd4_compoundargs *argp,
1605	struct nfsd4_exchange_id *exid)
1606	{
1607	__be32 status;
1608	u32 count;
1609
1610	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &count) < 0)
1611	return nfserr_bad_xdr;
1612	switch (count) {
1613	case 0:
1614	break;
1615	case 1:
1616	/* Note that RFC 8881 places no length limit on
1617	* nii_domain, but this implementation permits no
1618	* more than NFS4_OPAQUE_LIMIT bytes */
1619	status = nfsd4_decode_opaque(argp, o: &exid->nii_domain);
1620	if (status)
1621	return status;
1622	/* Note that RFC 8881 places no length limit on
1623	* nii_name, but this implementation permits no
1624	* more than NFS4_OPAQUE_LIMIT bytes */
1625	status = nfsd4_decode_opaque(argp, o: &exid->nii_name);
1626	if (status)
1627	return status;
1628	status = nfsd4_decode_nfstime4(argp, tv: &exid->nii_time);
1629	if (status)
1630	return status;
1631	break;
1632	default:
1633	return nfserr_bad_xdr;
1634	}
1635
1636	return nfs_ok;
1637	}
1638
1639	static __be32
1640	nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1641	union nfsd4_op_u *u)
1642	{
1643	struct nfsd4_exchange_id *exid = &u->exchange_id;
1644	__be32 status;
1645
1646	memset(exid, 0, sizeof(*exid));
1647	status = nfsd4_decode_verifier4(argp, verf: &exid->verifier);
1648	if (status)
1649	return status;
1650	status = nfsd4_decode_opaque(argp, o: &exid->clname);
1651	if (status)
1652	return status;
1653	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &exid->flags) < 0)
1654	return nfserr_bad_xdr;
1655	status = nfsd4_decode_state_protect4_a(argp, exid);
1656	if (status)
1657	return status;
1658	return nfsd4_decode_nfs_impl_id4(argp, exid);
1659	}
1660
1661	static __be32
1662	nfsd4_decode_channel_attrs4(struct nfsd4_compoundargs *argp,
1663	struct nfsd4_channel_attrs *ca)
1664	{
1665	__be32 *p;
1666
1667	p = xdr_inline_decode(xdr: argp->xdr, XDR_UNIT * 7);
1668	if (!p)
1669	return nfserr_bad_xdr;
1670
1671	/* headerpadsz is ignored */
1672	p++;
1673	ca->maxreq_sz = be32_to_cpup(p: p++);
1674	ca->maxresp_sz = be32_to_cpup(p: p++);
1675	ca->maxresp_cached = be32_to_cpup(p: p++);
1676	ca->maxops = be32_to_cpup(p: p++);
1677	ca->maxreqs = be32_to_cpup(p: p++);
1678	ca->nr_rdma_attrs = be32_to_cpup(p);
1679	switch (ca->nr_rdma_attrs) {
1680	case 0:
1681	break;
1682	case 1:
1683	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &ca->rdma_attrs) < 0)
1684	return nfserr_bad_xdr;
1685	break;
1686	default:
1687	return nfserr_bad_xdr;
1688	}
1689
1690	return nfs_ok;
1691	}
1692
1693	static __be32
1694	nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1695	union nfsd4_op_u *u)
1696	{
1697	struct nfsd4_create_session *sess = &u->create_session;
1698	__be32 status;
1699
1700	memset(sess, 0, sizeof(*sess));
1701	status = nfsd4_decode_clientid4(argp, clientid: &sess->clientid);
1702	if (status)
1703	return status;
1704	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &sess->seqid) < 0)
1705	return nfserr_bad_xdr;
1706	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &sess->flags) < 0)
1707	return nfserr_bad_xdr;
1708	status = nfsd4_decode_channel_attrs4(argp, ca: &sess->fore_channel);
1709	if (status)
1710	return status;
1711	status = nfsd4_decode_channel_attrs4(argp, ca: &sess->back_channel);
1712	if (status)
1713	return status;
1714	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &sess->callback_prog) < 0)
1715	return nfserr_bad_xdr;
1716	return nfsd4_decode_cb_sec(argp, cbs: &sess->cb_sec);
1717	}
1718
1719	static __be32
1720	nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1721	union nfsd4_op_u *u)
1722	{
1723	struct nfsd4_destroy_session *destroy_session = &u->destroy_session;
1724	return nfsd4_decode_sessionid4(argp, sessionid: &destroy_session->sessionid);
1725	}
1726
1727	static __be32
1728	nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1729	union nfsd4_op_u *u)
1730	{
1731	struct nfsd4_free_stateid *free_stateid = &u->free_stateid;
1732	return nfsd4_decode_stateid4(argp, sid: &free_stateid->fr_stateid);
1733	}
1734
1735	#ifdef CONFIG_NFSD_PNFS
1736	static __be32
1737	nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1738	union nfsd4_op_u *u)
1739	{
1740	struct nfsd4_getdeviceinfo *gdev = &u->getdeviceinfo;
1741	__be32 status;
1742
1743	memset(gdev, 0, sizeof(*gdev));
1744	status = nfsd4_decode_deviceid4(argp, devid: &gdev->gd_devid);
1745	if (status)
1746	return status;
1747	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &gdev->gd_layout_type) < 0)
1748	return nfserr_bad_xdr;
1749	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &gdev->gd_maxcount) < 0)
1750	return nfserr_bad_xdr;
1751	if (xdr_stream_decode_uint32_array(xdr: argp->xdr,
1752	array: &gdev->gd_notify_types, array_size: 1) < 0)
1753	return nfserr_bad_xdr;
1754
1755	return nfs_ok;
1756	}
1757
1758	static __be32
1759	nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1760	union nfsd4_op_u *u)
1761	{
1762	struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
1763	__be32 *p, status;
1764
1765	memset(lcp, 0, sizeof(*lcp));
1766	if (xdr_stream_decode_u64(xdr: argp->xdr, ptr: &lcp->lc_seg.offset) < 0)
1767	return nfserr_bad_xdr;
1768	if (xdr_stream_decode_u64(xdr: argp->xdr, ptr: &lcp->lc_seg.length) < 0)
1769	return nfserr_bad_xdr;
1770	if (xdr_stream_decode_bool(xdr: argp->xdr, ptr: &lcp->lc_reclaim) < 0)
1771	return nfserr_bad_xdr;
1772	status = nfsd4_decode_stateid4(argp, sid: &lcp->lc_sid);
1773	if (status)
1774	return status;
1775	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &lcp->lc_newoffset) < 0)
1776	return nfserr_bad_xdr;
1777	if (lcp->lc_newoffset) {
1778	if (xdr_stream_decode_u64(xdr: argp->xdr, ptr: &lcp->lc_last_wr) < 0)
1779	return nfserr_bad_xdr;
1780	} else
1781	lcp->lc_last_wr = 0;
1782	p = xdr_inline_decode(xdr: argp->xdr, XDR_UNIT);
1783	if (!p)
1784	return nfserr_bad_xdr;
1785	if (xdr_item_is_present(p)) {
1786	status = nfsd4_decode_nfstime4(argp, tv: &lcp->lc_mtime);
1787	if (status)
1788	return status;
1789	} else {
1790	lcp->lc_mtime.tv_nsec = UTIME_NOW;
1791	}
1792	return nfsd4_decode_layoutupdate4(argp, lcp);
1793	}
1794
1795	static __be32
1796	nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1797	union nfsd4_op_u *u)
1798	{
1799	struct nfsd4_layoutget *lgp = &u->layoutget;
1800	__be32 status;
1801
1802	memset(lgp, 0, sizeof(*lgp));
1803	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &lgp->lg_signal) < 0)
1804	return nfserr_bad_xdr;
1805	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &lgp->lg_layout_type) < 0)
1806	return nfserr_bad_xdr;
1807	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &lgp->lg_seg.iomode) < 0)
1808	return nfserr_bad_xdr;
1809	if (xdr_stream_decode_u64(xdr: argp->xdr, ptr: &lgp->lg_seg.offset) < 0)
1810	return nfserr_bad_xdr;
1811	if (xdr_stream_decode_u64(xdr: argp->xdr, ptr: &lgp->lg_seg.length) < 0)
1812	return nfserr_bad_xdr;
1813	if (xdr_stream_decode_u64(xdr: argp->xdr, ptr: &lgp->lg_minlength) < 0)
1814	return nfserr_bad_xdr;
1815	status = nfsd4_decode_stateid4(argp, sid: &lgp->lg_sid);
1816	if (status)
1817	return status;
1818	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &lgp->lg_maxcount) < 0)
1819	return nfserr_bad_xdr;
1820
1821	return nfs_ok;
1822	}
1823
1824	static __be32
1825	nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1826	union nfsd4_op_u *u)
1827	{
1828	struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
1829	memset(lrp, 0, sizeof(*lrp));
1830	if (xdr_stream_decode_bool(xdr: argp->xdr, ptr: &lrp->lr_reclaim) < 0)
1831	return nfserr_bad_xdr;
1832	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &lrp->lr_layout_type) < 0)
1833	return nfserr_bad_xdr;
1834	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &lrp->lr_seg.iomode) < 0)
1835	return nfserr_bad_xdr;
1836	return nfsd4_decode_layoutreturn4(argp, lrp);
1837	}
1838	#endif /* CONFIG_NFSD_PNFS */
1839
1840	static __be32 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1841	union nfsd4_op_u *u)
1842	{
1843	struct nfsd4_secinfo_no_name *sin = &u->secinfo_no_name;
1844	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &sin->sin_style) < 0)
1845	return nfserr_bad_xdr;
1846
1847	sin->sin_exp = NULL;
1848	return nfs_ok;
1849	}
1850
1851	static __be32
1852	nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1853	union nfsd4_op_u *u)
1854	{
1855	struct nfsd4_sequence *seq = &u->sequence;
1856	__be32 *p, status;
1857
1858	status = nfsd4_decode_sessionid4(argp, sessionid: &seq->sessionid);
1859	if (status)
1860	return status;
1861	p = xdr_inline_decode(xdr: argp->xdr, XDR_UNIT * 4);
1862	if (!p)
1863	return nfserr_bad_xdr;
1864	seq->seqid = be32_to_cpup(p: p++);
1865	seq->slotid = be32_to_cpup(p: p++);
1866	seq->maxslots = be32_to_cpup(p: p++);
1867	seq->cachethis = be32_to_cpup(p);
1868
1869	seq->status_flags = 0;
1870	return nfs_ok;
1871	}
1872
1873	static __be32
1874	nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp,
1875	union nfsd4_op_u *u)
1876	{
1877	struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
1878	struct nfsd4_test_stateid_id *stateid;
1879	__be32 status;
1880	u32 i;
1881
1882	memset(test_stateid, 0, sizeof(*test_stateid));
1883	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &test_stateid->ts_num_ids) < 0)
1884	return nfserr_bad_xdr;
1885
1886	INIT_LIST_HEAD(list: &test_stateid->ts_stateid_list);
1887	for (i = 0; i < test_stateid->ts_num_ids; i++) {
1888	stateid = svcxdr_tmpalloc(argp, len: sizeof(*stateid));
1889	if (!stateid)
1890	return nfserr_jukebox;
1891	INIT_LIST_HEAD(list: &stateid->ts_id_list);
1892	list_add_tail(new: &stateid->ts_id_list, head: &test_stateid->ts_stateid_list);
1893	status = nfsd4_decode_stateid4(argp, sid: &stateid->ts_id_stateid);
1894	if (status)
1895	return status;
1896	}
1897
1898	return nfs_ok;
1899	}
1900
1901	static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp,
1902	union nfsd4_op_u *u)
1903	{
1904	struct nfsd4_destroy_clientid *dc = &u->destroy_clientid;
1905	return nfsd4_decode_clientid4(argp, clientid: &dc->clientid);
1906	}
1907
1908	static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp,
1909	union nfsd4_op_u *u)
1910	{
1911	struct nfsd4_reclaim_complete *rc = &u->reclaim_complete;
1912	if (xdr_stream_decode_bool(xdr: argp->xdr, ptr: &rc->rca_one_fs) < 0)
1913	return nfserr_bad_xdr;
1914	return nfs_ok;
1915	}
1916
1917	static __be32
1918	nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1919	union nfsd4_op_u *u)
1920	{
1921	struct nfsd4_fallocate *fallocate = &u->allocate;
1922	__be32 status;
1923
1924	status = nfsd4_decode_stateid4(argp, sid: &fallocate->falloc_stateid);
1925	if (status)
1926	return status;
1927	if (xdr_stream_decode_u64(xdr: argp->xdr, ptr: &fallocate->falloc_offset) < 0)
1928	return nfserr_bad_xdr;
1929	if (xdr_stream_decode_u64(xdr: argp->xdr, ptr: &fallocate->falloc_length) < 0)
1930	return nfserr_bad_xdr;
1931
1932	return nfs_ok;
1933	}
1934
1935	static __be32 nfsd4_decode_nl4_server(struct nfsd4_compoundargs *argp,
1936	struct nl4_server *ns)
1937	{
1938	struct nfs42_netaddr *naddr;
1939	__be32 *p;
1940
1941	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &ns->nl4_type) < 0)
1942	return nfserr_bad_xdr;
1943
1944	/* currently support for 1 inter-server source server */
1945	switch (ns->nl4_type) {
1946	case NL4_NETADDR:
1947	naddr = &ns->u.nl4_addr;
1948
1949	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &naddr->netid_len) < 0)
1950	return nfserr_bad_xdr;
1951	if (naddr->netid_len > RPCBIND_MAXNETIDLEN)
1952	return nfserr_bad_xdr;
1953
1954	p = xdr_inline_decode(xdr: argp->xdr, nbytes: naddr->netid_len);
1955	if (!p)
1956	return nfserr_bad_xdr;
1957	memcpy(naddr->netid, p, naddr->netid_len);
1958
1959	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &naddr->addr_len) < 0)
1960	return nfserr_bad_xdr;
1961	if (naddr->addr_len > RPCBIND_MAXUADDRLEN)
1962	return nfserr_bad_xdr;
1963
1964	p = xdr_inline_decode(xdr: argp->xdr, nbytes: naddr->addr_len);
1965	if (!p)
1966	return nfserr_bad_xdr;
1967	memcpy(naddr->addr, p, naddr->addr_len);
1968	break;
1969	default:
1970	return nfserr_bad_xdr;
1971	}
1972
1973	return nfs_ok;
1974	}
1975
1976	static __be32
1977	nfsd4_decode_copy(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1978	{
1979	struct nfsd4_copy *copy = &u->copy;
1980	u32 consecutive, i, count, sync;
1981	struct nl4_server *ns_dummy;
1982	__be32 status;
1983
1984	memset(copy, 0, sizeof(*copy));
1985	status = nfsd4_decode_stateid4(argp, sid: &copy->cp_src_stateid);
1986	if (status)
1987	return status;
1988	status = nfsd4_decode_stateid4(argp, sid: &copy->cp_dst_stateid);
1989	if (status)
1990	return status;
1991	if (xdr_stream_decode_u64(xdr: argp->xdr, ptr: &copy->cp_src_pos) < 0)
1992	return nfserr_bad_xdr;
1993	if (xdr_stream_decode_u64(xdr: argp->xdr, ptr: &copy->cp_dst_pos) < 0)
1994	return nfserr_bad_xdr;
1995	if (xdr_stream_decode_u64(xdr: argp->xdr, ptr: &copy->cp_count) < 0)
1996	return nfserr_bad_xdr;
1997	/* ca_consecutive: we always do consecutive copies */
1998	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &consecutive) < 0)
1999	return nfserr_bad_xdr;
2000	if (xdr_stream_decode_bool(xdr: argp->xdr, ptr: &sync) < 0)
2001	return nfserr_bad_xdr;
2002	nfsd4_copy_set_sync(copy, sync);
2003
2004	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &count) < 0)
2005	return nfserr_bad_xdr;
2006	copy->cp_src = svcxdr_tmpalloc(argp, len: sizeof(*copy->cp_src));
2007	if (copy->cp_src == NULL)
2008	return nfserr_jukebox;
2009	if (count == 0) { /* intra-server copy */
2010	__set_bit(NFSD4_COPY_F_INTRA, &copy->cp_flags);
2011	return nfs_ok;
2012	}
2013
2014	/* decode all the supplied server addresses but use only the first */
2015	status = nfsd4_decode_nl4_server(argp, ns: copy->cp_src);
2016	if (status)
2017	return status;
2018
2019	ns_dummy = kmalloc(size: sizeof(struct nl4_server), GFP_KERNEL);
2020	if (ns_dummy == NULL)
2021	return nfserr_jukebox;
2022	for (i = 0; i < count - 1; i++) {
2023	status = nfsd4_decode_nl4_server(argp, ns: ns_dummy);
2024	if (status) {
2025	kfree(objp: ns_dummy);
2026	return status;
2027	}
2028	}
2029	kfree(objp: ns_dummy);
2030
2031	return nfs_ok;
2032	}
2033
2034	static __be32
2035	nfsd4_decode_copy_notify(struct nfsd4_compoundargs *argp,
2036	union nfsd4_op_u *u)
2037	{
2038	struct nfsd4_copy_notify *cn = &u->copy_notify;
2039	__be32 status;
2040
2041	memset(cn, 0, sizeof(*cn));
2042	cn->cpn_src = svcxdr_tmpalloc(argp, len: sizeof(*cn->cpn_src));
2043	if (cn->cpn_src == NULL)
2044	return nfserr_jukebox;
2045	cn->cpn_dst = svcxdr_tmpalloc(argp, len: sizeof(*cn->cpn_dst));
2046	if (cn->cpn_dst == NULL)
2047	return nfserr_jukebox;
2048
2049	status = nfsd4_decode_stateid4(argp, sid: &cn->cpn_src_stateid);
2050	if (status)
2051	return status;
2052	return nfsd4_decode_nl4_server(argp, ns: cn->cpn_dst);
2053	}
2054
2055	static __be32
2056	nfsd4_decode_offload_status(struct nfsd4_compoundargs *argp,
2057	union nfsd4_op_u *u)
2058	{
2059	struct nfsd4_offload_status *os = &u->offload_status;
2060	os->count = 0;
2061	os->status = 0;
2062	return nfsd4_decode_stateid4(argp, sid: &os->stateid);
2063	}
2064
2065	static __be32
2066	nfsd4_decode_seek(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
2067	{
2068	struct nfsd4_seek *seek = &u->seek;
2069	__be32 status;
2070
2071	status = nfsd4_decode_stateid4(argp, sid: &seek->seek_stateid);
2072	if (status)
2073	return status;
2074	if (xdr_stream_decode_u64(xdr: argp->xdr, ptr: &seek->seek_offset) < 0)
2075	return nfserr_bad_xdr;
2076	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &seek->seek_whence) < 0)
2077	return nfserr_bad_xdr;
2078
2079	seek->seek_eof = 0;
2080	seek->seek_pos = 0;
2081	return nfs_ok;
2082	}
2083
2084	static __be32
2085	nfsd4_decode_clone(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
2086	{
2087	struct nfsd4_clone *clone = &u->clone;
2088	__be32 status;
2089
2090	status = nfsd4_decode_stateid4(argp, sid: &clone->cl_src_stateid);
2091	if (status)
2092	return status;
2093	status = nfsd4_decode_stateid4(argp, sid: &clone->cl_dst_stateid);
2094	if (status)
2095	return status;
2096	if (xdr_stream_decode_u64(xdr: argp->xdr, ptr: &clone->cl_src_pos) < 0)
2097	return nfserr_bad_xdr;
2098	if (xdr_stream_decode_u64(xdr: argp->xdr, ptr: &clone->cl_dst_pos) < 0)
2099	return nfserr_bad_xdr;
2100	if (xdr_stream_decode_u64(xdr: argp->xdr, ptr: &clone->cl_count) < 0)
2101	return nfserr_bad_xdr;
2102
2103	return nfs_ok;
2104	}
2105
2106	/*
2107	* XDR data that is more than PAGE_SIZE in size is normally part of a
2108	* read or write. However, the size of extended attributes is limited
2109	* by the maximum request size, and then further limited by the underlying
2110	* filesystem limits. This can exceed PAGE_SIZE (currently, XATTR_SIZE_MAX
2111	* is 64k). Since there is no kvec- or page-based interface to xattrs,
2112	* and we're not dealing with contiguous pages, we need to do some copying.
2113	*/
2114
2115	/*
2116	* Decode data into buffer.
2117	*/
2118	static __be32
2119	nfsd4_vbuf_from_vector(struct nfsd4_compoundargs *argp, struct xdr_buf *xdr,
2120	char **bufp, u32 buflen)
2121	{
2122	struct page **pages = xdr->pages;
2123	struct kvec *head = xdr->head;
2124	char *tmp, *dp;
2125	u32 len;
2126
2127	if (buflen <= head->iov_len) {
2128	/*
2129	* We're in luck, the head has enough space. Just return
2130	* the head, no need for copying.
2131	*/
2132	*bufp = head->iov_base;
2133	return 0;
2134	}
2135
2136	tmp = svcxdr_tmpalloc(argp, len: buflen);
2137	if (tmp == NULL)
2138	return nfserr_jukebox;
2139
2140	dp = tmp;
2141	memcpy(dp, head->iov_base, head->iov_len);
2142	buflen -= head->iov_len;
2143	dp += head->iov_len;
2144
2145	while (buflen > 0) {
2146	len = min_t(u32, buflen, PAGE_SIZE);
2147	memcpy(dp, page_address(*pages), len);
2148
2149	buflen -= len;
2150	dp += len;
2151	pages++;
2152	}
2153
2154	*bufp = tmp;
2155	return 0;
2156	}
2157
2158	/*
2159	* Get a user extended attribute name from the XDR buffer.
2160	* It will not have the "user." prefix, so prepend it.
2161	* Lastly, check for nul characters in the name.
2162	*/
2163	static __be32
2164	nfsd4_decode_xattr_name(struct nfsd4_compoundargs *argp, char **namep)
2165	{
2166	char *name, *sp, *dp;
2167	u32 namelen, cnt;
2168	__be32 *p;
2169
2170	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &namelen) < 0)
2171	return nfserr_bad_xdr;
2172	if (namelen > (XATTR_NAME_MAX - XATTR_USER_PREFIX_LEN))
2173	return nfserr_nametoolong;
2174	if (namelen == 0)
2175	return nfserr_bad_xdr;
2176	p = xdr_inline_decode(xdr: argp->xdr, nbytes: namelen);
2177	if (!p)
2178	return nfserr_bad_xdr;
2179	name = svcxdr_tmpalloc(argp, len: namelen + XATTR_USER_PREFIX_LEN + 1);
2180	if (!name)
2181	return nfserr_jukebox;
2182	memcpy(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
2183
2184	/*
2185	* Copy the extended attribute name over while checking for 0
2186	* characters.
2187	*/
2188	sp = (char *)p;
2189	dp = name + XATTR_USER_PREFIX_LEN;
2190	cnt = namelen;
2191
2192	while (cnt-- > 0) {
2193	if (*sp == '\0')
2194	return nfserr_bad_xdr;
2195	*dp++ = *sp++;
2196	}
2197	*dp = '\0';
2198
2199	*namep = name;
2200
2201	return nfs_ok;
2202	}
2203
2204	/*
2205	* A GETXATTR op request comes without a length specifier. We just set the
2206	* maximum length for the reply based on XATTR_SIZE_MAX and the maximum
2207	* channel reply size. nfsd_getxattr will probe the length of the xattr,
2208	* check it against getxa_len, and allocate + return the value.
2209	*/
2210	static __be32
2211	nfsd4_decode_getxattr(struct nfsd4_compoundargs *argp,
2212	union nfsd4_op_u *u)
2213	{
2214	struct nfsd4_getxattr *getxattr = &u->getxattr;
2215	__be32 status;
2216	u32 maxcount;
2217
2218	memset(getxattr, 0, sizeof(*getxattr));
2219	status = nfsd4_decode_xattr_name(argp, namep: &getxattr->getxa_name);
2220	if (status)
2221	return status;
2222
2223	maxcount = svc_max_payload(rqstp: argp->rqstp);
2224	maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount);
2225
2226	getxattr->getxa_len = maxcount;
2227	return nfs_ok;
2228	}
2229
2230	static __be32
2231	nfsd4_decode_setxattr(struct nfsd4_compoundargs *argp,
2232	union nfsd4_op_u *u)
2233	{
2234	struct nfsd4_setxattr *setxattr = &u->setxattr;
2235	u32 flags, maxcount, size;
2236	__be32 status;
2237
2238	memset(setxattr, 0, sizeof(*setxattr));
2239
2240	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &flags) < 0)
2241	return nfserr_bad_xdr;
2242
2243	if (flags > SETXATTR4_REPLACE)
2244	return nfserr_inval;
2245	setxattr->setxa_flags = flags;
2246
2247	status = nfsd4_decode_xattr_name(argp, namep: &setxattr->setxa_name);
2248	if (status)
2249	return status;
2250
2251	maxcount = svc_max_payload(rqstp: argp->rqstp);
2252	maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount);
2253
2254	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &size) < 0)
2255	return nfserr_bad_xdr;
2256	if (size > maxcount)
2257	return nfserr_xattr2big;
2258
2259	setxattr->setxa_len = size;
2260	if (size > 0) {
2261	struct xdr_buf payload;
2262
2263	if (!xdr_stream_subsegment(xdr: argp->xdr, subbuf: &payload, len: size))
2264	return nfserr_bad_xdr;
2265	status = nfsd4_vbuf_from_vector(argp, xdr: &payload,
2266	bufp: &setxattr->setxa_buf, buflen: size);
2267	}
2268
2269	return nfs_ok;
2270	}
2271
2272	static __be32
2273	nfsd4_decode_listxattrs(struct nfsd4_compoundargs *argp,
2274	union nfsd4_op_u *u)
2275	{
2276	struct nfsd4_listxattrs *listxattrs = &u->listxattrs;
2277	u32 maxcount;
2278
2279	memset(listxattrs, 0, sizeof(*listxattrs));
2280
2281	if (xdr_stream_decode_u64(xdr: argp->xdr, ptr: &listxattrs->lsxa_cookie) < 0)
2282	return nfserr_bad_xdr;
2283
2284	/*
2285	* If the cookie is too large to have even one user.x attribute
2286	* plus trailing '\0' left in a maximum size buffer, it's invalid.
2287	*/
2288	if (listxattrs->lsxa_cookie >=
2289	(XATTR_LIST_MAX / (XATTR_USER_PREFIX_LEN + 2)))
2290	return nfserr_badcookie;
2291
2292	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &maxcount) < 0)
2293	return nfserr_bad_xdr;
2294	if (maxcount < 8)
2295	/* Always need at least 2 words (length and one character) */
2296	return nfserr_inval;
2297
2298	maxcount = min(maxcount, svc_max_payload(argp->rqstp));
2299	listxattrs->lsxa_maxcount = maxcount;
2300
2301	return nfs_ok;
2302	}
2303
2304	static __be32
2305	nfsd4_decode_removexattr(struct nfsd4_compoundargs *argp,
2306	union nfsd4_op_u *u)
2307	{
2308	struct nfsd4_removexattr *removexattr = &u->removexattr;
2309	memset(removexattr, 0, sizeof(*removexattr));
2310	return nfsd4_decode_xattr_name(argp, namep: &removexattr->rmxa_name);
2311	}
2312
2313	static __be32
2314	nfsd4_decode_noop(struct nfsd4_compoundargs *argp, union nfsd4_op_u *p)
2315	{
2316	return nfs_ok;
2317	}
2318
2319	static __be32
2320	nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, union nfsd4_op_u *p)
2321	{
2322	return nfserr_notsupp;
2323	}
2324
2325	typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u);
2326
2327	static const nfsd4_dec nfsd4_dec_ops[] = {
2328	[OP_ACCESS] = nfsd4_decode_access,
2329	[OP_CLOSE] = nfsd4_decode_close,
2330	[OP_COMMIT] = nfsd4_decode_commit,
2331	[OP_CREATE] = nfsd4_decode_create,
2332	[OP_DELEGPURGE] = nfsd4_decode_notsupp,
2333	[OP_DELEGRETURN] = nfsd4_decode_delegreturn,
2334	[OP_GETATTR] = nfsd4_decode_getattr,
2335	[OP_GETFH] = nfsd4_decode_noop,
2336	[OP_LINK] = nfsd4_decode_link,
2337	[OP_LOCK] = nfsd4_decode_lock,
2338	[OP_LOCKT] = nfsd4_decode_lockt,
2339	[OP_LOCKU] = nfsd4_decode_locku,
2340	[OP_LOOKUP] = nfsd4_decode_lookup,
2341	[OP_LOOKUPP] = nfsd4_decode_noop,
2342	[OP_NVERIFY] = nfsd4_decode_verify,
2343	[OP_OPEN] = nfsd4_decode_open,
2344	[OP_OPENATTR] = nfsd4_decode_notsupp,
2345	[OP_OPEN_CONFIRM] = nfsd4_decode_open_confirm,
2346	[OP_OPEN_DOWNGRADE] = nfsd4_decode_open_downgrade,
2347	[OP_PUTFH] = nfsd4_decode_putfh,
2348	[OP_PUTPUBFH] = nfsd4_decode_putpubfh,
2349	[OP_PUTROOTFH] = nfsd4_decode_noop,
2350	[OP_READ] = nfsd4_decode_read,
2351	[OP_READDIR] = nfsd4_decode_readdir,
2352	[OP_READLINK] = nfsd4_decode_noop,
2353	[OP_REMOVE] = nfsd4_decode_remove,
2354	[OP_RENAME] = nfsd4_decode_rename,
2355	[OP_RENEW] = nfsd4_decode_renew,
2356	[OP_RESTOREFH] = nfsd4_decode_noop,
2357	[OP_SAVEFH] = nfsd4_decode_noop,
2358	[OP_SECINFO] = nfsd4_decode_secinfo,
2359	[OP_SETATTR] = nfsd4_decode_setattr,
2360	[OP_SETCLIENTID] = nfsd4_decode_setclientid,
2361	[OP_SETCLIENTID_CONFIRM] = nfsd4_decode_setclientid_confirm,
2362	[OP_VERIFY] = nfsd4_decode_verify,
2363	[OP_WRITE] = nfsd4_decode_write,
2364	[OP_RELEASE_LOCKOWNER] = nfsd4_decode_release_lockowner,
2365
2366	/* new operations for NFSv4.1 */
2367	[OP_BACKCHANNEL_CTL] = nfsd4_decode_backchannel_ctl,
2368	[OP_BIND_CONN_TO_SESSION] = nfsd4_decode_bind_conn_to_session,
2369	[OP_EXCHANGE_ID] = nfsd4_decode_exchange_id,
2370	[OP_CREATE_SESSION] = nfsd4_decode_create_session,
2371	[OP_DESTROY_SESSION] = nfsd4_decode_destroy_session,
2372	[OP_FREE_STATEID] = nfsd4_decode_free_stateid,
2373	[OP_GET_DIR_DELEGATION] = nfsd4_decode_notsupp,
2374	#ifdef CONFIG_NFSD_PNFS
2375	[OP_GETDEVICEINFO] = nfsd4_decode_getdeviceinfo,
2376	[OP_GETDEVICELIST] = nfsd4_decode_notsupp,
2377	[OP_LAYOUTCOMMIT] = nfsd4_decode_layoutcommit,
2378	[OP_LAYOUTGET] = nfsd4_decode_layoutget,
2379	[OP_LAYOUTRETURN] = nfsd4_decode_layoutreturn,
2380	#else
2381	[OP_GETDEVICEINFO] = nfsd4_decode_notsupp,
2382	[OP_GETDEVICELIST] = nfsd4_decode_notsupp,
2383	[OP_LAYOUTCOMMIT] = nfsd4_decode_notsupp,
2384	[OP_LAYOUTGET] = nfsd4_decode_notsupp,
2385	[OP_LAYOUTRETURN] = nfsd4_decode_notsupp,
2386	#endif
2387	[OP_SECINFO_NO_NAME] = nfsd4_decode_secinfo_no_name,
2388	[OP_SEQUENCE] = nfsd4_decode_sequence,
2389	[OP_SET_SSV] = nfsd4_decode_notsupp,
2390	[OP_TEST_STATEID] = nfsd4_decode_test_stateid,
2391	[OP_WANT_DELEGATION] = nfsd4_decode_notsupp,
2392	[OP_DESTROY_CLIENTID] = nfsd4_decode_destroy_clientid,
2393	[OP_RECLAIM_COMPLETE] = nfsd4_decode_reclaim_complete,
2394
2395	/* new operations for NFSv4.2 */
2396	[OP_ALLOCATE] = nfsd4_decode_fallocate,
2397	[OP_COPY] = nfsd4_decode_copy,
2398	[OP_COPY_NOTIFY] = nfsd4_decode_copy_notify,
2399	[OP_DEALLOCATE] = nfsd4_decode_fallocate,
2400	[OP_IO_ADVISE] = nfsd4_decode_notsupp,
2401	[OP_LAYOUTERROR] = nfsd4_decode_notsupp,
2402	[OP_LAYOUTSTATS] = nfsd4_decode_notsupp,
2403	[OP_OFFLOAD_CANCEL] = nfsd4_decode_offload_status,
2404	[OP_OFFLOAD_STATUS] = nfsd4_decode_offload_status,
2405	[OP_READ_PLUS] = nfsd4_decode_read,
2406	[OP_SEEK] = nfsd4_decode_seek,
2407	[OP_WRITE_SAME] = nfsd4_decode_notsupp,
2408	[OP_CLONE] = nfsd4_decode_clone,
2409	/* RFC 8276 extended atributes operations */
2410	[OP_GETXATTR] = nfsd4_decode_getxattr,
2411	[OP_SETXATTR] = nfsd4_decode_setxattr,
2412	[OP_LISTXATTRS] = nfsd4_decode_listxattrs,
2413	[OP_REMOVEXATTR] = nfsd4_decode_removexattr,
2414	};
2415
2416	static inline bool
2417	nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
2418	{
2419	if (op->opnum < FIRST_NFS4_OP)
2420	return false;
2421	else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
2422	return false;
2423	else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
2424	return false;
2425	else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
2426	return false;
2427	return true;
2428	}
2429
2430	static bool
2431	nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
2432	{
2433	struct nfsd4_op *op;
2434	bool cachethis = false;
2435	int auth_slack= argp->rqstp->rq_auth_slack;
2436	int max_reply = auth_slack + 8; /* opcnt, status */
2437	int readcount = 0;
2438	int readbytes = 0;
2439	__be32 *p;
2440	int i;
2441
2442	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &argp->taglen) < 0)
2443	return false;
2444	max_reply += XDR_UNIT;
2445	argp->tag = NULL;
2446	if (unlikely(argp->taglen)) {
2447	if (argp->taglen > NFSD4_MAX_TAGLEN)
2448	return false;
2449	p = xdr_inline_decode(xdr: argp->xdr, nbytes: argp->taglen);
2450	if (!p)
2451	return false;
2452	argp->tag = svcxdr_savemem(argp, p, len: argp->taglen);
2453	if (!argp->tag)
2454	return false;
2455	max_reply += xdr_align_size(n: argp->taglen);
2456	}
2457
2458	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &argp->minorversion) < 0)
2459	return false;
2460	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &argp->client_opcnt) < 0)
2461	return false;
2462	argp->opcnt = min_t(u32, argp->client_opcnt,
2463	NFSD_MAX_OPS_PER_COMPOUND);
2464
2465	if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
2466	argp->ops = vcalloc(n: argp->opcnt, size: sizeof(*argp->ops));
2467	if (!argp->ops) {
2468	argp->ops = argp->iops;
2469	return false;
2470	}
2471	}
2472
2473	if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
2474	argp->opcnt = 0;
2475
2476	for (i = 0; i < argp->opcnt; i++) {
2477	op = &argp->ops[i];
2478	op->replay = NULL;
2479	op->opdesc = NULL;
2480
2481	if (xdr_stream_decode_u32(xdr: argp->xdr, ptr: &op->opnum) < 0)
2482	return false;
2483	if (nfsd4_opnum_in_range(argp, op)) {
2484	op->opdesc = OPDESC(op);
2485	op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
2486	if (op->status != nfs_ok)
2487	trace_nfsd_compound_decode_err(rqstp: argp->rqstp,
2488	args_opcnt: argp->opcnt, resp_opcnt: i,
2489	opnum: op->opnum,
2490	status: op->status);
2491	} else {
2492	op->opnum = OP_ILLEGAL;
2493	op->status = nfserr_op_illegal;
2494	}
2495
2496	/*
2497	* We'll try to cache the result in the DRC if any one
2498	* op in the compound wants to be cached:
2499	*/
2500	cachethis |= nfsd4_cache_this_op(op);
2501
2502	if (op->opnum == OP_READ || op->opnum == OP_READ_PLUS) {
2503	readcount++;
2504	readbytes += nfsd4_max_reply(rqstp: argp->rqstp, op);
2505	} else
2506	max_reply += nfsd4_max_reply(rqstp: argp->rqstp, op);
2507	/*
2508	* OP_LOCK and OP_LOCKT may return a conflicting lock.
2509	* (Special case because it will just skip encoding this
2510	* if it runs out of xdr buffer space, and it is the only
2511	* operation that behaves this way.)
2512	*/
2513	if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
2514	max_reply += NFS4_OPAQUE_LIMIT;
2515
2516	if (op->status) {
2517	argp->opcnt = i+1;
2518	break;
2519	}
2520	}
2521	/* Sessions make the DRC unnecessary: */
2522	if (argp->minorversion)
2523	cachethis = false;
2524	svc_reserve(rqstp: argp->rqstp, space: max_reply + readbytes);
2525	argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
2526
2527	argp->splice_ok = nfsd_read_splice_ok(rqstp: argp->rqstp);
2528	if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
2529	argp->splice_ok = false;
2530
2531	return true;
2532	}
2533
2534	static __be32 nfsd4_encode_nfs_fh4(struct xdr_stream *xdr,
2535	struct knfsd_fh *fh_handle)
2536	{
2537	return nfsd4_encode_opaque(xdr, data: fh_handle->fh_raw, size: fh_handle->fh_size);
2538	}
2539
2540	/* This is a frequently-encoded type; open-coded for speed */
2541	static __be32 nfsd4_encode_nfstime4(struct xdr_stream *xdr,
2542	const struct timespec64 *tv)
2543	{
2544	__be32 *p;
2545
2546	p = xdr_reserve_space(xdr, XDR_UNIT * 3);
2547	if (!p)
2548	return nfserr_resource;
2549	p = xdr_encode_hyper(p, val: tv->tv_sec);
2550	*p = cpu_to_be32(tv->tv_nsec);
2551	return nfs_ok;
2552	}
2553
2554	static __be32 nfsd4_encode_specdata4(struct xdr_stream *xdr,
2555	unsigned int major, unsigned int minor)
2556	{
2557	__be32 status;
2558
2559	status = nfsd4_encode_uint32_t(xdr, val: major);
2560	if (status != nfs_ok)
2561	return status;
2562	return nfsd4_encode_uint32_t(xdr, val: minor);
2563	}
2564
2565	static __be32
2566	nfsd4_encode_change_info4(struct xdr_stream *xdr, const struct nfsd4_change_info *c)
2567	{
2568	__be32 status;
2569
2570	status = nfsd4_encode_bool(xdr, val: c->atomic);
2571	if (status != nfs_ok)
2572	return status;
2573	status = nfsd4_encode_changeid4(xdr, c->before_change);
2574	if (status != nfs_ok)
2575	return status;
2576	return nfsd4_encode_changeid4(xdr, c->after_change);
2577	}
2578
2579	static __be32 nfsd4_encode_netaddr4(struct xdr_stream *xdr,
2580	const struct nfs42_netaddr *addr)
2581	{
2582	__be32 status;
2583
2584	/* na_r_netid */
2585	status = nfsd4_encode_opaque(xdr, data: addr->netid, size: addr->netid_len);
2586	if (status != nfs_ok)
2587	return status;
2588	/* na_r_addr */
2589	return nfsd4_encode_opaque(xdr, data: addr->addr, size: addr->addr_len);
2590	}
2591
2592	/* Encode as an array of strings the string given with components
2593	* separated @sep, escaped with esc_enter and esc_exit.
2594	*/
2595	static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
2596	char *components, char esc_enter,
2597	char esc_exit)
2598	{
2599	__be32 *p;
2600	__be32 pathlen;
2601	int pathlen_offset;
2602	int strlen, count=0;
2603	char *str, *end, *next;
2604
2605	dprintk("nfsd4_encode_components(%s)\n", components);
2606
2607	pathlen_offset = xdr->buf->len;
2608	p = xdr_reserve_space(xdr, nbytes: 4);
2609	if (!p)
2610	return nfserr_resource;
2611	p++; /* We will fill this in with @count later */
2612
2613	end = str = components;
2614	while (*end) {
2615	bool found_esc = false;
2616
2617	/* try to parse as esc_start, ..., esc_end, sep */
2618	if (*str == esc_enter) {
2619	for (; *end && (*end != esc_exit); end++)
2620	/* find esc_exit or end of string */;
2621	next = end + 1;
2622	if (*end && (!*next || *next == sep)) {
2623	str++;
2624	found_esc = true;
2625	}
2626	}
2627
2628	if (!found_esc)
2629	for (; *end && (*end != sep); end++)
2630	/* find sep or end of string */;
2631
2632	strlen = end - str;
2633	if (strlen) {
2634	p = xdr_reserve_space(xdr, nbytes: strlen + 4);
2635	if (!p)
2636	return nfserr_resource;
2637	p = xdr_encode_opaque(p, ptr: str, len: strlen);
2638	count++;
2639	}
2640	else
2641	end++;
2642	if (found_esc)
2643	end = next;
2644
2645	str = end;
2646	}
2647	pathlen = htonl(count);
2648	write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2649	return 0;
2650	}
2651
2652	/* Encode as an array of strings the string given with components
2653	* separated @sep.
2654	*/
2655	static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2656	char *components)
2657	{
2658	return nfsd4_encode_components_esc(xdr, sep, components, esc_enter: 0, esc_exit: 0);
2659	}
2660
2661	static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2662	struct nfsd4_fs_location *location)
2663	{
2664	__be32 status;
2665
2666	status = nfsd4_encode_components_esc(xdr, sep: ':', components: location->hosts,
2667	esc_enter: '[', esc_exit: ']');
2668	if (status)
2669	return status;
2670	status = nfsd4_encode_components(xdr, sep: '/', components: location->path);
2671	if (status)
2672	return status;
2673	return nfs_ok;
2674	}
2675
2676	static __be32 nfsd4_encode_pathname4(struct xdr_stream *xdr,
2677	const struct path *root,
2678	const struct path *path)
2679	{
2680	struct path cur = *path;
2681	__be32 *p;
2682	struct dentry **components = NULL;
2683	unsigned int ncomponents = 0;
2684	__be32 err = nfserr_jukebox;
2685
2686	dprintk("nfsd4_encode_components(");
2687
2688	path_get(&cur);
2689	/* First walk the path up to the nfsd root, and store the
2690	* dentries/path components in an array.
2691	*/
2692	for (;;) {
2693	if (path_equal(path1: &cur, path2: root))
2694	break;
2695	if (cur.dentry == cur.mnt->mnt_root) {
2696	if (follow_up(&cur))
2697	continue;
2698	goto out_free;
2699	}
2700	if ((ncomponents & 15) == 0) {
2701	struct dentry **new;
2702	new = krealloc(objp: components,
2703	new_size: sizeof(*new) * (ncomponents + 16),
2704	GFP_KERNEL);
2705	if (!new)
2706	goto out_free;
2707	components = new;
2708	}
2709	components[ncomponents++] = cur.dentry;
2710	cur.dentry = dget_parent(dentry: cur.dentry);
2711	}
2712	err = nfserr_resource;
2713	p = xdr_reserve_space(xdr, nbytes: 4);
2714	if (!p)
2715	goto out_free;
2716	*p++ = cpu_to_be32(ncomponents);
2717
2718	while (ncomponents) {
2719	struct dentry *dentry = components[ncomponents - 1];
2720	unsigned int len;
2721
2722	spin_lock(lock: &dentry->d_lock);
2723	len = dentry->d_name.len;
2724	p = xdr_reserve_space(xdr, nbytes: len + 4);
2725	if (!p) {
2726	spin_unlock(lock: &dentry->d_lock);
2727	goto out_free;
2728	}
2729	p = xdr_encode_opaque(p, ptr: dentry->d_name.name, len);
2730	dprintk("/%pd", dentry);
2731	spin_unlock(lock: &dentry->d_lock);
2732	dput(dentry);
2733	ncomponents--;
2734	}
2735
2736	err = 0;
2737	out_free:
2738	dprintk(")\n");
2739	while (ncomponents)
2740	dput(components[--ncomponents]);
2741	kfree(objp: components);
2742	path_put(&cur);
2743	return err;
2744	}
2745
2746	static __be32 nfsd4_encode_fs_locations4(struct xdr_stream *xdr,
2747	struct svc_rqst *rqstp,
2748	struct svc_export *exp)
2749	{
2750	struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2751	struct svc_export *exp_ps;
2752	unsigned int i;
2753	__be32 status;
2754
2755	/* fs_root */
2756	exp_ps = rqst_find_fsidzero_export(rqstp);
2757	if (IS_ERR(ptr: exp_ps))
2758	return nfserrno(errno: PTR_ERR(ptr: exp_ps));
2759	status = nfsd4_encode_pathname4(xdr, root: &exp_ps->ex_path, path: &exp->ex_path);
2760	exp_put(exp: exp_ps);
2761	if (status != nfs_ok)
2762	return status;
2763
2764	/* locations<> */
2765	if (xdr_stream_encode_u32(xdr, n: fslocs->locations_count) != XDR_UNIT)
2766	return nfserr_resource;
2767	for (i = 0; i < fslocs->locations_count; i++) {
2768	status = nfsd4_encode_fs_location4(xdr, location: &fslocs->locations[i]);
2769	if (status != nfs_ok)
2770	return status;
2771	}
2772
2773	return nfs_ok;
2774	}
2775
2776	static __be32 nfsd4_encode_nfsace4(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2777	struct nfs4_ace *ace)
2778	{
2779	__be32 status;
2780
2781	/* type */
2782	status = nfsd4_encode_acetype4(xdr, ace->type);
2783	if (status != nfs_ok)
2784	return nfserr_resource;
2785	/* flag */
2786	status = nfsd4_encode_aceflag4(xdr, ace->flag);
2787	if (status != nfs_ok)
2788	return nfserr_resource;
2789	/* access mask */
2790	status = nfsd4_encode_acemask4(xdr, ace->access_mask & NFS4_ACE_MASK_ALL);
2791	if (status != nfs_ok)
2792	return nfserr_resource;
2793	/* who */
2794	if (ace->whotype != NFS4_ACL_WHO_NAMED)
2795	return nfs4_acl_write_who(xdr, who: ace->whotype);
2796	if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2797	return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2798	return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2799	}
2800
2801	#define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2802	FATTR4_WORD0_RDATTR_ERROR)
2803	#define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2804	#define WORD2_ABSENT_FS_ATTRS 0
2805
2806	#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2807	static inline __be32
2808	nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2809	void *context, int len)
2810	{
2811	__be32 *p;
2812
2813	p = xdr_reserve_space(xdr, nbytes: len + 4 + 4 + 4);
2814	if (!p)
2815	return nfserr_resource;
2816
2817	/*
2818	* For now we use a 0 here to indicate the null translation; in
2819	* the future we may place a call to translation code here.
2820	*/
2821	*p++ = cpu_to_be32(0); /* lfs */
2822	*p++ = cpu_to_be32(0); /* pi */
2823	p = xdr_encode_opaque(p, ptr: context, len);
2824	return 0;
2825	}
2826	#else
2827	static inline __be32
2828	nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2829	void *context, int len)
2830	{ return 0; }
2831	#endif
2832
2833	static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2834	{
2835	/* As per referral draft: */
2836	if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2837	*bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2838	if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2839	*bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2840	*rdattr_err = NFSERR_MOVED;
2841	else
2842	return nfserr_moved;
2843	}
2844	*bmval0 &= WORD0_ABSENT_FS_ATTRS;
2845	*bmval1 &= WORD1_ABSENT_FS_ATTRS;
2846	*bmval2 &= WORD2_ABSENT_FS_ATTRS;
2847	return 0;
2848	}
2849
2850
2851	static int nfsd4_get_mounted_on_ino(struct svc_export *exp, u64 *pino)
2852	{
2853	struct path path = exp->ex_path;
2854	struct kstat stat;
2855	int err;
2856
2857	path_get(&path);
2858	while (follow_up(&path)) {
2859	if (path.dentry != path.mnt->mnt_root)
2860	break;
2861	}
2862	err = vfs_getattr(&path, &stat, STATX_INO, AT_STATX_SYNC_AS_STAT);
2863	path_put(&path);
2864	if (!err)
2865	*pino = stat.ino;
2866	return err;
2867	}
2868
2869	static __be32
2870	nfsd4_encode_bitmap4(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2871	{
2872	__be32 *p;
2873
2874	if (bmval2) {
2875	p = xdr_reserve_space(xdr, XDR_UNIT * 4);
2876	if (!p)
2877	goto out_resource;
2878	*p++ = cpu_to_be32(3);
2879	*p++ = cpu_to_be32(bmval0);
2880	*p++ = cpu_to_be32(bmval1);
2881	*p++ = cpu_to_be32(bmval2);
2882	} else if (bmval1) {
2883	p = xdr_reserve_space(xdr, XDR_UNIT * 3);
2884	if (!p)
2885	goto out_resource;
2886	*p++ = cpu_to_be32(2);
2887	*p++ = cpu_to_be32(bmval0);
2888	*p++ = cpu_to_be32(bmval1);
2889	} else {
2890	p = xdr_reserve_space(xdr, XDR_UNIT * 2);
2891	if (!p)
2892	goto out_resource;
2893	*p++ = cpu_to_be32(1);
2894	*p++ = cpu_to_be32(bmval0);
2895	}
2896
2897	return nfs_ok;
2898	out_resource:
2899	return nfserr_resource;
2900	}
2901
2902	struct nfsd4_fattr_args {
2903	struct svc_rqst *rqstp;
2904	struct svc_fh *fhp;
2905	struct svc_export *exp;
2906	struct dentry *dentry;
2907	struct kstat stat;
2908	struct kstatfs statfs;
2909	struct nfs4_acl *acl;
2910	u64 size;
2911	#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2912	void *context;
2913	int contextlen;
2914	#endif
2915	u32 rdattr_err;
2916	bool contextsupport;
2917	bool ignore_crossmnt;
2918	};
2919
2920	typedef __be32(*nfsd4_enc_attr)(struct xdr_stream *xdr,
2921	const struct nfsd4_fattr_args *args);
2922
2923	static __be32 nfsd4_encode_fattr4__noop(struct xdr_stream *xdr,
2924	const struct nfsd4_fattr_args *args)
2925	{
2926	return nfs_ok;
2927	}
2928
2929	static __be32 nfsd4_encode_fattr4__true(struct xdr_stream *xdr,
2930	const struct nfsd4_fattr_args *args)
2931	{
2932	return nfsd4_encode_bool(xdr, val: true);
2933	}
2934
2935	static __be32 nfsd4_encode_fattr4__false(struct xdr_stream *xdr,
2936	const struct nfsd4_fattr_args *args)
2937	{
2938	return nfsd4_encode_bool(xdr, val: false);
2939	}
2940
2941	static __be32 nfsd4_encode_fattr4_supported_attrs(struct xdr_stream *xdr,
2942	const struct nfsd4_fattr_args *args)
2943	{
2944	struct nfsd4_compoundres *resp = args->rqstp->rq_resp;
2945	u32 minorversion = resp->cstate.minorversion;
2946	u32 supp[3];
2947
2948	memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2949	if (!IS_POSIXACL(d_inode(args->dentry)))
2950	supp[0] &= ~FATTR4_WORD0_ACL;
2951	if (!args->contextsupport)
2952	supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2953
2954	return nfsd4_encode_bitmap4(xdr, bmval0: supp[0], bmval1: supp[1], bmval2: supp[2]);
2955	}
2956
2957	static __be32 nfsd4_encode_fattr4_type(struct xdr_stream *xdr,
2958	const struct nfsd4_fattr_args *args)
2959	{
2960	__be32 *p;
2961
2962	p = xdr_reserve_space(xdr, XDR_UNIT);
2963	if (!p)
2964	return nfserr_resource;
2965
2966	switch (args->stat.mode & S_IFMT) {
2967	case S_IFIFO:
2968	*p = cpu_to_be32(NF4FIFO);
2969	break;
2970	case S_IFCHR:
2971	*p = cpu_to_be32(NF4CHR);
2972	break;
2973	case S_IFDIR:
2974	*p = cpu_to_be32(NF4DIR);
2975	break;
2976	case S_IFBLK:
2977	*p = cpu_to_be32(NF4BLK);
2978	break;
2979	case S_IFLNK:
2980	*p = cpu_to_be32(NF4LNK);
2981	break;
2982	case S_IFREG:
2983	*p = cpu_to_be32(NF4REG);
2984	break;
2985	case S_IFSOCK:
2986	*p = cpu_to_be32(NF4SOCK);
2987	break;
2988	default:
2989	return nfserr_serverfault;
2990	}
2991
2992	return nfs_ok;
2993	}
2994
2995	static __be32 nfsd4_encode_fattr4_fh_expire_type(struct xdr_stream *xdr,
2996	const struct nfsd4_fattr_args *args)
2997	{
2998	u32 mask;
2999
3000	mask = NFS4_FH_PERSISTENT;
3001	if (!(args->exp->ex_flags & NFSEXP_NOSUBTREECHECK))
3002	mask |= NFS4_FH_VOL_RENAME;
3003	return nfsd4_encode_uint32_t(xdr, val: mask);
3004	}
3005
3006	static __be32 nfsd4_encode_fattr4_change(struct xdr_stream *xdr,
3007	const struct nfsd4_fattr_args *args)
3008	{
3009	const struct svc_export *exp = args->exp;
3010	u64 c;
3011
3012	if (unlikely(exp->ex_flags & NFSEXP_V4ROOT)) {
3013	u32 flush_time = convert_to_wallclock(sinceboot: exp->cd->flush_time);
3014
3015	if (xdr_stream_encode_u32(xdr, n: flush_time) != XDR_UNIT)
3016	return nfserr_resource;
3017	if (xdr_stream_encode_u32(xdr, n: 0) != XDR_UNIT)
3018	return nfserr_resource;
3019	return nfs_ok;
3020	}
3021
3022	c = nfsd4_change_attribute(stat: &args->stat, inode: d_inode(dentry: args->dentry));
3023	return nfsd4_encode_changeid4(xdr, c);
3024	}
3025
3026	static __be32 nfsd4_encode_fattr4_size(struct xdr_stream *xdr,
3027	const struct nfsd4_fattr_args *args)
3028	{
3029	return nfsd4_encode_uint64_t(xdr, val: args->size);
3030	}
3031
3032	static __be32 nfsd4_encode_fattr4_fsid(struct xdr_stream *xdr,
3033	const struct nfsd4_fattr_args *args)
3034	{
3035	__be32 *p;
3036
3037	p = xdr_reserve_space(xdr, XDR_UNIT * 2 + XDR_UNIT * 2);
3038	if (!p)
3039	return nfserr_resource;
3040
3041	if (unlikely(args->exp->ex_fslocs.migrated)) {
3042	p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
3043	xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
3044	return nfs_ok;
3045	}
3046	switch (fsid_source(fhp: args->fhp)) {
3047	case FSIDSOURCE_FSID:
3048	p = xdr_encode_hyper(p, val: (u64)args->exp->ex_fsid);
3049	xdr_encode_hyper(p, val: (u64)0);
3050	break;
3051	case FSIDSOURCE_DEV:
3052	*p++ = xdr_zero;
3053	*p++ = cpu_to_be32(MAJOR(args->stat.dev));
3054	*p++ = xdr_zero;
3055	*p = cpu_to_be32(MINOR(args->stat.dev));
3056	break;
3057	case FSIDSOURCE_UUID:
3058	xdr_encode_opaque_fixed(p, ptr: args->exp->ex_uuid, EX_UUID_LEN);
3059	break;
3060	}
3061
3062	return nfs_ok;
3063	}
3064
3065	static __be32 nfsd4_encode_fattr4_lease_time(struct xdr_stream *xdr,
3066	const struct nfsd4_fattr_args *args)
3067	{
3068	struct nfsd_net *nn = net_generic(SVC_NET(args->rqstp), id: nfsd_net_id);
3069
3070	return nfsd4_encode_nfs_lease4(xdr, nn->nfsd4_lease);
3071	}
3072
3073	static __be32 nfsd4_encode_fattr4_rdattr_error(struct xdr_stream *xdr,
3074	const struct nfsd4_fattr_args *args)
3075	{
3076	return nfsd4_encode_uint32_t(xdr, val: args->rdattr_err);
3077	}
3078
3079	static __be32 nfsd4_encode_fattr4_aclsupport(struct xdr_stream *xdr,
3080	const struct nfsd4_fattr_args *args)
3081	{
3082	u32 mask;
3083
3084	mask = 0;
3085	if (IS_POSIXACL(d_inode(args->dentry)))
3086	mask = ACL4_SUPPORT_ALLOW_ACL | ACL4_SUPPORT_DENY_ACL;
3087	return nfsd4_encode_uint32_t(xdr, val: mask);
3088	}
3089
3090	static __be32 nfsd4_encode_fattr4_acl(struct xdr_stream *xdr,
3091	const struct nfsd4_fattr_args *args)
3092	{
3093	struct nfs4_acl *acl = args->acl;
3094	struct nfs4_ace *ace;
3095	__be32 status;
3096
3097	/* nfsace4<> */
3098	if (!acl) {
3099	if (xdr_stream_encode_u32(xdr, n: 0) != XDR_UNIT)
3100	return nfserr_resource;
3101	} else {
3102	if (xdr_stream_encode_u32(xdr, n: acl->naces) != XDR_UNIT)
3103	return nfserr_resource;
3104	for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
3105	status = nfsd4_encode_nfsace4(xdr, rqstp: args->rqstp, ace);
3106	if (status != nfs_ok)
3107	return status;
3108	}
3109	}
3110	return nfs_ok;
3111	}
3112
3113	static __be32 nfsd4_encode_fattr4_filehandle(struct xdr_stream *xdr,
3114	const struct nfsd4_fattr_args *args)
3115	{
3116	return nfsd4_encode_nfs_fh4(xdr, fh_handle: &args->fhp->fh_handle);
3117	}
3118
3119	static __be32 nfsd4_encode_fattr4_fileid(struct xdr_stream *xdr,
3120	const struct nfsd4_fattr_args *args)
3121	{
3122	return nfsd4_encode_uint64_t(xdr, val: args->stat.ino);
3123	}
3124
3125	static __be32 nfsd4_encode_fattr4_files_avail(struct xdr_stream *xdr,
3126	const struct nfsd4_fattr_args *args)
3127	{
3128	return nfsd4_encode_uint64_t(xdr, val: args->statfs.f_ffree);
3129	}
3130
3131	static __be32 nfsd4_encode_fattr4_files_free(struct xdr_stream *xdr,
3132	const struct nfsd4_fattr_args *args)
3133	{
3134	return nfsd4_encode_uint64_t(xdr, val: args->statfs.f_ffree);
3135	}
3136
3137	static __be32 nfsd4_encode_fattr4_files_total(struct xdr_stream *xdr,
3138	const struct nfsd4_fattr_args *args)
3139	{
3140	return nfsd4_encode_uint64_t(xdr, val: args->statfs.f_files);
3141	}
3142
3143	static __be32 nfsd4_encode_fattr4_fs_locations(struct xdr_stream *xdr,
3144	const struct nfsd4_fattr_args *args)
3145	{
3146	return nfsd4_encode_fs_locations4(xdr, rqstp: args->rqstp, exp: args->exp);
3147	}
3148
3149	static __be32 nfsd4_encode_fattr4_maxfilesize(struct xdr_stream *xdr,
3150	const struct nfsd4_fattr_args *args)
3151	{
3152	struct super_block *sb = args->exp->ex_path.mnt->mnt_sb;
3153
3154	return nfsd4_encode_uint64_t(xdr, val: sb->s_maxbytes);
3155	}
3156
3157	static __be32 nfsd4_encode_fattr4_maxlink(struct xdr_stream *xdr,
3158	const struct nfsd4_fattr_args *args)
3159	{
3160	return nfsd4_encode_uint32_t(xdr, val: 255);
3161	}
3162
3163	static __be32 nfsd4_encode_fattr4_maxname(struct xdr_stream *xdr,
3164	const struct nfsd4_fattr_args *args)
3165	{
3166	return nfsd4_encode_uint32_t(xdr, val: args->statfs.f_namelen);
3167	}
3168
3169	static __be32 nfsd4_encode_fattr4_maxread(struct xdr_stream *xdr,
3170	const struct nfsd4_fattr_args *args)
3171	{
3172	return nfsd4_encode_uint64_t(xdr, val: svc_max_payload(rqstp: args->rqstp));
3173	}
3174
3175	static __be32 nfsd4_encode_fattr4_maxwrite(struct xdr_stream *xdr,
3176	const struct nfsd4_fattr_args *args)
3177	{
3178	return nfsd4_encode_uint64_t(xdr, val: svc_max_payload(rqstp: args->rqstp));
3179	}
3180
3181	static __be32 nfsd4_encode_fattr4_mode(struct xdr_stream *xdr,
3182	const struct nfsd4_fattr_args *args)
3183	{
3184	return nfsd4_encode_mode4(xdr, args->stat.mode & S_IALLUGO);
3185	}
3186
3187	static __be32 nfsd4_encode_fattr4_numlinks(struct xdr_stream *xdr,
3188	const struct nfsd4_fattr_args *args)
3189	{
3190	return nfsd4_encode_uint32_t(xdr, val: args->stat.nlink);
3191	}
3192
3193	static __be32 nfsd4_encode_fattr4_owner(struct xdr_stream *xdr,
3194	const struct nfsd4_fattr_args *args)
3195	{
3196	return nfsd4_encode_user(xdr, args->rqstp, args->stat.uid);
3197	}
3198
3199	static __be32 nfsd4_encode_fattr4_owner_group(struct xdr_stream *xdr,
3200	const struct nfsd4_fattr_args *args)
3201	{
3202	return nfsd4_encode_group(xdr, args->rqstp, args->stat.gid);
3203	}
3204
3205	static __be32 nfsd4_encode_fattr4_rawdev(struct xdr_stream *xdr,
3206	const struct nfsd4_fattr_args *args)
3207	{
3208	return nfsd4_encode_specdata4(xdr, MAJOR(args->stat.rdev),
3209	MINOR(args->stat.rdev));
3210	}
3211
3212	static __be32 nfsd4_encode_fattr4_space_avail(struct xdr_stream *xdr,
3213	const struct nfsd4_fattr_args *args)
3214	{
3215	u64 avail = (u64)args->statfs.f_bavail * (u64)args->statfs.f_bsize;
3216
3217	return nfsd4_encode_uint64_t(xdr, val: avail);
3218	}
3219
3220	static __be32 nfsd4_encode_fattr4_space_free(struct xdr_stream *xdr,
3221	const struct nfsd4_fattr_args *args)
3222	{
3223	u64 free = (u64)args->statfs.f_bfree * (u64)args->statfs.f_bsize;
3224
3225	return nfsd4_encode_uint64_t(xdr, val: free);
3226	}
3227
3228	static __be32 nfsd4_encode_fattr4_space_total(struct xdr_stream *xdr,
3229	const struct nfsd4_fattr_args *args)
3230	{
3231	u64 total = (u64)args->statfs.f_blocks * (u64)args->statfs.f_bsize;
3232
3233	return nfsd4_encode_uint64_t(xdr, val: total);
3234	}
3235
3236	static __be32 nfsd4_encode_fattr4_space_used(struct xdr_stream *xdr,
3237	const struct nfsd4_fattr_args *args)
3238	{
3239	return nfsd4_encode_uint64_t(xdr, val: (u64)args->stat.blocks << 9);
3240	}
3241
3242	static __be32 nfsd4_encode_fattr4_time_access(struct xdr_stream *xdr,
3243	const struct nfsd4_fattr_args *args)
3244	{
3245	return nfsd4_encode_nfstime4(xdr, tv: &args->stat.atime);
3246	}
3247
3248	static __be32 nfsd4_encode_fattr4_time_create(struct xdr_stream *xdr,
3249	const struct nfsd4_fattr_args *args)
3250	{
3251	return nfsd4_encode_nfstime4(xdr, tv: &args->stat.btime);
3252	}
3253
3254	/*
3255	* ctime (in NFSv4, time_metadata) is not writeable, and the client
3256	* doesn't really care what resolution could theoretically be stored by
3257	* the filesystem.
3258	*
3259	* The client cares how close together changes can be while still
3260	* guaranteeing ctime changes. For most filesystems (which have
3261	* timestamps with nanosecond fields) that is limited by the resolution
3262	* of the time returned from current_time() (which I'm assuming to be
3263	* 1/HZ).
3264	*/
3265	static __be32 nfsd4_encode_fattr4_time_delta(struct xdr_stream *xdr,
3266	const struct nfsd4_fattr_args *args)
3267	{
3268	const struct inode *inode = d_inode(dentry: args->dentry);
3269	u32 ns = max_t(u32, NSEC_PER_SEC/HZ, inode->i_sb->s_time_gran);
3270	struct timespec64 ts = ns_to_timespec64(nsec: ns);
3271
3272	return nfsd4_encode_nfstime4(xdr, tv: &ts);
3273	}
3274
3275	static __be32 nfsd4_encode_fattr4_time_metadata(struct xdr_stream *xdr,
3276	const struct nfsd4_fattr_args *args)
3277	{
3278	return nfsd4_encode_nfstime4(xdr, tv: &args->stat.ctime);
3279	}
3280
3281	static __be32 nfsd4_encode_fattr4_time_modify(struct xdr_stream *xdr,
3282	const struct nfsd4_fattr_args *args)
3283	{
3284	return nfsd4_encode_nfstime4(xdr, tv: &args->stat.mtime);
3285	}
3286
3287	static __be32 nfsd4_encode_fattr4_mounted_on_fileid(struct xdr_stream *xdr,
3288	const struct nfsd4_fattr_args *args)
3289	{
3290	u64 ino;
3291	int err;
3292
3293	if (!args->ignore_crossmnt &&
3294	args->dentry == args->exp->ex_path.mnt->mnt_root) {
3295	err = nfsd4_get_mounted_on_ino(exp: args->exp, pino: &ino);
3296	if (err)
3297	return nfserrno(errno: err);
3298	} else
3299	ino = args->stat.ino;
3300
3301	return nfsd4_encode_uint64_t(xdr, val: ino);
3302	}
3303
3304	#ifdef CONFIG_NFSD_PNFS
3305
3306	static __be32 nfsd4_encode_fattr4_fs_layout_types(struct xdr_stream *xdr,
3307	const struct nfsd4_fattr_args *args)
3308	{
3309	unsigned long mask = args->exp->ex_layout_types;
3310	int i;
3311
3312	/* Hamming weight of @mask is the number of layout types to return */
3313	if (xdr_stream_encode_u32(xdr, n: hweight_long(w: mask)) != XDR_UNIT)
3314	return nfserr_resource;
3315	for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
3316	if (mask & BIT(i)) {
3317	/* layouttype4 */
3318	if (xdr_stream_encode_u32(xdr, n: i) != XDR_UNIT)
3319	return nfserr_resource;
3320	}
3321	return nfs_ok;
3322	}
3323
3324	static __be32 nfsd4_encode_fattr4_layout_types(struct xdr_stream *xdr,
3325	const struct nfsd4_fattr_args *args)
3326	{
3327	unsigned long mask = args->exp->ex_layout_types;
3328	int i;
3329
3330	/* Hamming weight of @mask is the number of layout types to return */
3331	if (xdr_stream_encode_u32(xdr, n: hweight_long(w: mask)) != XDR_UNIT)
3332	return nfserr_resource;
3333	for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
3334	if (mask & BIT(i)) {
3335	/* layouttype4 */
3336	if (xdr_stream_encode_u32(xdr, n: i) != XDR_UNIT)
3337	return nfserr_resource;
3338	}
3339	return nfs_ok;
3340	}
3341
3342	static __be32 nfsd4_encode_fattr4_layout_blksize(struct xdr_stream *xdr,
3343	const struct nfsd4_fattr_args *args)
3344	{
3345	return nfsd4_encode_uint32_t(xdr, val: args->stat.blksize);
3346	}
3347
3348	#endif
3349
3350	static __be32 nfsd4_encode_fattr4_suppattr_exclcreat(struct xdr_stream *xdr,
3351	const struct nfsd4_fattr_args *args)
3352	{
3353	struct nfsd4_compoundres *resp = args->rqstp->rq_resp;
3354	u32 supp[3];
3355
3356	memcpy(supp, nfsd_suppattrs[resp->cstate.minorversion], sizeof(supp));
3357	supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
3358	supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
3359	supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
3360
3361	return nfsd4_encode_bitmap4(xdr, bmval0: supp[0], bmval1: supp[1], bmval2: supp[2]);
3362	}
3363
3364	#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3365	static __be32 nfsd4_encode_fattr4_sec_label(struct xdr_stream *xdr,
3366	const struct nfsd4_fattr_args *args)
3367	{
3368	return nfsd4_encode_security_label(xdr, rqstp: args->rqstp,
3369	context: args->context, len: args->contextlen);
3370	}
3371	#endif
3372
3373	static __be32 nfsd4_encode_fattr4_xattr_support(struct xdr_stream *xdr,
3374	const struct nfsd4_fattr_args *args)
3375	{
3376	int err = xattr_supports_user_prefix(inode: d_inode(dentry: args->dentry));
3377
3378	return nfsd4_encode_bool(xdr, val: err == 0);
3379	}
3380
3381	static const nfsd4_enc_attr nfsd4_enc_fattr4_encode_ops[] = {
3382	[FATTR4_SUPPORTED_ATTRS] = nfsd4_encode_fattr4_supported_attrs,
3383	[FATTR4_TYPE] = nfsd4_encode_fattr4_type,
3384	[FATTR4_FH_EXPIRE_TYPE] = nfsd4_encode_fattr4_fh_expire_type,
3385	[FATTR4_CHANGE] = nfsd4_encode_fattr4_change,
3386	[FATTR4_SIZE] = nfsd4_encode_fattr4_size,
3387	[FATTR4_LINK_SUPPORT] = nfsd4_encode_fattr4__true,
3388	[FATTR4_SYMLINK_SUPPORT] = nfsd4_encode_fattr4__true,
3389	[FATTR4_NAMED_ATTR] = nfsd4_encode_fattr4__false,
3390	[FATTR4_FSID] = nfsd4_encode_fattr4_fsid,
3391	[FATTR4_UNIQUE_HANDLES] = nfsd4_encode_fattr4__true,
3392	[FATTR4_LEASE_TIME] = nfsd4_encode_fattr4_lease_time,
3393	[FATTR4_RDATTR_ERROR] = nfsd4_encode_fattr4_rdattr_error,
3394	[FATTR4_ACL] = nfsd4_encode_fattr4_acl,
3395	[FATTR4_ACLSUPPORT] = nfsd4_encode_fattr4_aclsupport,
3396	[FATTR4_ARCHIVE] = nfsd4_encode_fattr4__noop,
3397	[FATTR4_CANSETTIME] = nfsd4_encode_fattr4__true,
3398	[FATTR4_CASE_INSENSITIVE] = nfsd4_encode_fattr4__false,
3399	[FATTR4_CASE_PRESERVING] = nfsd4_encode_fattr4__true,
3400	[FATTR4_CHOWN_RESTRICTED] = nfsd4_encode_fattr4__true,
3401	[FATTR4_FILEHANDLE] = nfsd4_encode_fattr4_filehandle,
3402	[FATTR4_FILEID] = nfsd4_encode_fattr4_fileid,
3403	[FATTR4_FILES_AVAIL] = nfsd4_encode_fattr4_files_avail,
3404	[FATTR4_FILES_FREE] = nfsd4_encode_fattr4_files_free,
3405	[FATTR4_FILES_TOTAL] = nfsd4_encode_fattr4_files_total,
3406	[FATTR4_FS_LOCATIONS] = nfsd4_encode_fattr4_fs_locations,
3407	[FATTR4_HIDDEN] = nfsd4_encode_fattr4__noop,
3408	[FATTR4_HOMOGENEOUS] = nfsd4_encode_fattr4__true,
3409	[FATTR4_MAXFILESIZE] = nfsd4_encode_fattr4_maxfilesize,
3410	[FATTR4_MAXLINK] = nfsd4_encode_fattr4_maxlink,
3411	[FATTR4_MAXNAME] = nfsd4_encode_fattr4_maxname,
3412	[FATTR4_MAXREAD] = nfsd4_encode_fattr4_maxread,
3413	[FATTR4_MAXWRITE] = nfsd4_encode_fattr4_maxwrite,
3414	[FATTR4_MIMETYPE] = nfsd4_encode_fattr4__noop,
3415	[FATTR4_MODE] = nfsd4_encode_fattr4_mode,
3416	[FATTR4_NO_TRUNC] = nfsd4_encode_fattr4__true,
3417	[FATTR4_NUMLINKS] = nfsd4_encode_fattr4_numlinks,
3418	[FATTR4_OWNER] = nfsd4_encode_fattr4_owner,
3419	[FATTR4_OWNER_GROUP] = nfsd4_encode_fattr4_owner_group,
3420	[FATTR4_QUOTA_AVAIL_HARD] = nfsd4_encode_fattr4__noop,
3421	[FATTR4_QUOTA_AVAIL_SOFT] = nfsd4_encode_fattr4__noop,
3422	[FATTR4_QUOTA_USED] = nfsd4_encode_fattr4__noop,
3423	[FATTR4_RAWDEV] = nfsd4_encode_fattr4_rawdev,
3424	[FATTR4_SPACE_AVAIL] = nfsd4_encode_fattr4_space_avail,
3425	[FATTR4_SPACE_FREE] = nfsd4_encode_fattr4_space_free,
3426	[FATTR4_SPACE_TOTAL] = nfsd4_encode_fattr4_space_total,
3427	[FATTR4_SPACE_USED] = nfsd4_encode_fattr4_space_used,
3428	[FATTR4_SYSTEM] = nfsd4_encode_fattr4__noop,
3429	[FATTR4_TIME_ACCESS] = nfsd4_encode_fattr4_time_access,
3430	[FATTR4_TIME_ACCESS_SET] = nfsd4_encode_fattr4__noop,
3431	[FATTR4_TIME_BACKUP] = nfsd4_encode_fattr4__noop,
3432	[FATTR4_TIME_CREATE] = nfsd4_encode_fattr4_time_create,
3433	[FATTR4_TIME_DELTA] = nfsd4_encode_fattr4_time_delta,
3434	[FATTR4_TIME_METADATA] = nfsd4_encode_fattr4_time_metadata,
3435	[FATTR4_TIME_MODIFY] = nfsd4_encode_fattr4_time_modify,
3436	[FATTR4_TIME_MODIFY_SET] = nfsd4_encode_fattr4__noop,
3437	[FATTR4_MOUNTED_ON_FILEID] = nfsd4_encode_fattr4_mounted_on_fileid,
3438	[FATTR4_DIR_NOTIF_DELAY] = nfsd4_encode_fattr4__noop,
3439	[FATTR4_DIRENT_NOTIF_DELAY] = nfsd4_encode_fattr4__noop,
3440	[FATTR4_DACL] = nfsd4_encode_fattr4__noop,
3441	[FATTR4_SACL] = nfsd4_encode_fattr4__noop,
3442	[FATTR4_CHANGE_POLICY] = nfsd4_encode_fattr4__noop,
3443	[FATTR4_FS_STATUS] = nfsd4_encode_fattr4__noop,
3444
3445	#ifdef CONFIG_NFSD_PNFS
3446	[FATTR4_FS_LAYOUT_TYPES] = nfsd4_encode_fattr4_fs_layout_types,
3447	[FATTR4_LAYOUT_HINT] = nfsd4_encode_fattr4__noop,
3448	[FATTR4_LAYOUT_TYPES] = nfsd4_encode_fattr4_layout_types,
3449	[FATTR4_LAYOUT_BLKSIZE] = nfsd4_encode_fattr4_layout_blksize,
3450	[FATTR4_LAYOUT_ALIGNMENT] = nfsd4_encode_fattr4__noop,
3451	#else
3452	[FATTR4_FS_LAYOUT_TYPES] = nfsd4_encode_fattr4__noop,
3453	[FATTR4_LAYOUT_HINT] = nfsd4_encode_fattr4__noop,
3454	[FATTR4_LAYOUT_TYPES] = nfsd4_encode_fattr4__noop,
3455	[FATTR4_LAYOUT_BLKSIZE] = nfsd4_encode_fattr4__noop,
3456	[FATTR4_LAYOUT_ALIGNMENT] = nfsd4_encode_fattr4__noop,
3457	#endif
3458
3459	[FATTR4_FS_LOCATIONS_INFO] = nfsd4_encode_fattr4__noop,
3460	[FATTR4_MDSTHRESHOLD] = nfsd4_encode_fattr4__noop,
3461	[FATTR4_RETENTION_GET] = nfsd4_encode_fattr4__noop,
3462	[FATTR4_RETENTION_SET] = nfsd4_encode_fattr4__noop,
3463	[FATTR4_RETENTEVT_GET] = nfsd4_encode_fattr4__noop,
3464	[FATTR4_RETENTEVT_SET] = nfsd4_encode_fattr4__noop,
3465	[FATTR4_RETENTION_HOLD] = nfsd4_encode_fattr4__noop,
3466	[FATTR4_MODE_SET_MASKED] = nfsd4_encode_fattr4__noop,
3467	[FATTR4_SUPPATTR_EXCLCREAT] = nfsd4_encode_fattr4_suppattr_exclcreat,
3468	[FATTR4_FS_CHARSET_CAP] = nfsd4_encode_fattr4__noop,
3469	[FATTR4_CLONE_BLKSIZE] = nfsd4_encode_fattr4__noop,
3470	[FATTR4_SPACE_FREED] = nfsd4_encode_fattr4__noop,
3471	[FATTR4_CHANGE_ATTR_TYPE] = nfsd4_encode_fattr4__noop,
3472
3473	#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3474	[FATTR4_SEC_LABEL] = nfsd4_encode_fattr4_sec_label,
3475	#else
3476	[FATTR4_SEC_LABEL] = nfsd4_encode_fattr4__noop,
3477	#endif
3478
3479	[FATTR4_MODE_UMASK] = nfsd4_encode_fattr4__noop,
3480	[FATTR4_XATTR_SUPPORT] = nfsd4_encode_fattr4_xattr_support,
3481	};
3482
3483	/*
3484	* Note: @fhp can be NULL; in this case, we might have to compose the filehandle
3485	* ourselves.
3486	*/
3487	static __be32
3488	nfsd4_encode_fattr4(struct svc_rqst *rqstp, struct xdr_stream *xdr,
3489	struct svc_fh *fhp, struct svc_export *exp,
3490	struct dentry *dentry, const u32 *bmval,
3491	int ignore_crossmnt)
3492	{
3493	DECLARE_BITMAP(attr_bitmap, ARRAY_SIZE(nfsd4_enc_fattr4_encode_ops));
3494	struct nfsd4_fattr_args args;
3495	struct svc_fh *tempfh = NULL;
3496	int starting_len = xdr->buf->len;
3497	__be32 *attrlen_p, status;
3498	int attrlen_offset;
3499	u32 attrmask[3];
3500	int err;
3501	struct nfsd4_compoundres *resp = rqstp->rq_resp;
3502	u32 minorversion = resp->cstate.minorversion;
3503	struct path path = {
3504	.mnt = exp->ex_path.mnt,
3505	.dentry = dentry,
3506	};
3507	unsigned long bit;
3508	bool file_modified = false;
3509	u64 size = 0;
3510
3511	WARN_ON_ONCE(bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1);
3512	WARN_ON_ONCE(!nfsd_attrs_supported(minorversion, bmval));
3513
3514	args.rqstp = rqstp;
3515	args.exp = exp;
3516	args.dentry = dentry;
3517	args.ignore_crossmnt = (ignore_crossmnt != 0);
3518
3519	/*
3520	* Make a local copy of the attribute bitmap that can be modified.
3521	*/
3522	attrmask[0] = bmval[0];
3523	attrmask[1] = bmval[1];
3524	attrmask[2] = bmval[2];
3525
3526	args.rdattr_err = 0;
3527	if (exp->ex_fslocs.migrated) {
3528	status = fattr_handle_absent_fs(bmval0: &attrmask[0], bmval1: &attrmask[1],
3529	bmval2: &attrmask[2], rdattr_err: &args.rdattr_err);
3530	if (status)
3531	goto out;
3532	}
3533	args.size = 0;
3534	if (attrmask[0] & (FATTR4_WORD0_CHANGE | FATTR4_WORD0_SIZE)) {
3535	status = nfsd4_deleg_getattr_conflict(rqstp, inode: d_inode(dentry),
3536	file_modified: &file_modified, size: &size);
3537	if (status)
3538	goto out;
3539	}
3540
3541	err = vfs_getattr(&path, &args.stat,
3542	STATX_BASIC_STATS | STATX_BTIME | STATX_CHANGE_COOKIE,
3543	AT_STATX_SYNC_AS_STAT);
3544	if (err)
3545	goto out_nfserr;
3546	if (file_modified)
3547	args.size = size;
3548	else
3549	args.size = args.stat.size;
3550
3551	if (!(args.stat.result_mask & STATX_BTIME))
3552	/* underlying FS does not offer btime so we can't share it */
3553	attrmask[1] &= ~FATTR4_WORD1_TIME_CREATE;
3554	if ((attrmask[0] & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
3555	FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
3556	(attrmask[1] & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
3557	FATTR4_WORD1_SPACE_TOTAL))) {
3558	err = vfs_statfs(&path, &args.statfs);
3559	if (err)
3560	goto out_nfserr;
3561	}
3562	if ((attrmask[0] & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) &&
3563	!fhp) {
3564	tempfh = kmalloc(size: sizeof(struct svc_fh), GFP_KERNEL);
3565	status = nfserr_jukebox;
3566	if (!tempfh)
3567	goto out;
3568	fh_init(fhp: tempfh, NFS4_FHSIZE);
3569	status = fh_compose(tempfh, exp, dentry, NULL);
3570	if (status)
3571	goto out;
3572	args.fhp = tempfh;
3573	} else
3574	args.fhp = fhp;
3575
3576	args.acl = NULL;
3577	if (attrmask[0] & FATTR4_WORD0_ACL) {
3578	err = nfsd4_get_nfs4_acl(rqstp, dentry, acl: &args.acl);
3579	if (err == -EOPNOTSUPP)
3580	attrmask[0] &= ~FATTR4_WORD0_ACL;
3581	else if (err == -EINVAL) {
3582	status = nfserr_attrnotsupp;
3583	goto out;
3584	} else if (err != 0)
3585	goto out_nfserr;
3586	}
3587
3588	args.contextsupport = false;
3589
3590	#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3591	args.context = NULL;
3592	if ((attrmask[2] & FATTR4_WORD2_SECURITY_LABEL) ||
3593	attrmask[0] & FATTR4_WORD0_SUPPORTED_ATTRS) {
3594	if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
3595	err = security_inode_getsecctx(inode: d_inode(dentry),
3596	ctx: &args.context, ctxlen: &args.contextlen);
3597	else
3598	err = -EOPNOTSUPP;
3599	args.contextsupport = (err == 0);
3600	if (attrmask[2] & FATTR4_WORD2_SECURITY_LABEL) {
3601	if (err == -EOPNOTSUPP)
3602	attrmask[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3603	else if (err)
3604	goto out_nfserr;
3605	}
3606	}
3607	#endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
3608
3609	/* attrmask */
3610	status = nfsd4_encode_bitmap4(xdr, bmval0: attrmask[0], bmval1: attrmask[1],
3611	bmval2: attrmask[2]);
3612	if (status)
3613	goto out;
3614
3615	/* attr_vals */
3616	attrlen_offset = xdr->buf->len;
3617	attrlen_p = xdr_reserve_space(xdr, XDR_UNIT);
3618	if (!attrlen_p)
3619	goto out_resource;
3620	bitmap_from_arr32(bitmap: attr_bitmap, buf: attrmask,
3621	ARRAY_SIZE(nfsd4_enc_fattr4_encode_ops));
3622	for_each_set_bit(bit, attr_bitmap,
3623	ARRAY_SIZE(nfsd4_enc_fattr4_encode_ops)) {
3624	status = nfsd4_enc_fattr4_encode_ops[bit](xdr, &args);
3625	if (status != nfs_ok)
3626	goto out;
3627	}
3628	*attrlen_p = cpu_to_be32(xdr->buf->len - attrlen_offset - XDR_UNIT);
3629	status = nfs_ok;
3630
3631	out:
3632	#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3633	if (args.context)
3634	security_release_secctx(secdata: args.context, seclen: args.contextlen);
3635	#endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
3636	kfree(objp: args.acl);
3637	if (tempfh) {
3638	fh_put(tempfh);
3639	kfree(objp: tempfh);
3640	}
3641	if (status)
3642	xdr_truncate_encode(xdr, len: starting_len);
3643	return status;
3644	out_nfserr:
3645	status = nfserrno(errno: err);
3646	goto out;
3647	out_resource:
3648	status = nfserr_resource;
3649	goto out;
3650	}
3651
3652	static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
3653	struct xdr_buf *buf, __be32 *p, int bytes)
3654	{
3655	xdr->scratch.iov_len = 0;
3656	memset(buf, 0, sizeof(struct xdr_buf));
3657	buf->head[0].iov_base = p;
3658	buf->head[0].iov_len = 0;
3659	buf->len = 0;
3660	xdr->buf = buf;
3661	xdr->iov = buf->head;
3662	xdr->p = p;
3663	xdr->end = (void *)p + bytes;
3664	buf->buflen = bytes;
3665	}
3666
3667	__be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
3668	struct svc_fh *fhp, struct svc_export *exp,
3669	struct dentry *dentry, u32 *bmval,
3670	struct svc_rqst *rqstp, int ignore_crossmnt)
3671	{
3672	struct xdr_buf dummy;
3673	struct xdr_stream xdr;
3674	__be32 ret;
3675
3676	svcxdr_init_encode_from_buffer(xdr: &xdr, buf: &dummy, p: *p, bytes: words << 2);
3677	ret = nfsd4_encode_fattr4(rqstp, xdr: &xdr, fhp, exp, dentry, bmval,
3678	ignore_crossmnt);
3679	*p = xdr.p;
3680	return ret;
3681	}
3682
3683	/*
3684	* The buffer space for this field was reserved during a previous
3685	* call to nfsd4_encode_entry4().
3686	*/
3687	static void nfsd4_encode_entry4_nfs_cookie4(const struct nfsd4_readdir *readdir,
3688	u64 offset)
3689	{
3690	__be64 cookie = cpu_to_be64(offset);
3691	struct xdr_stream *xdr = readdir->xdr;
3692
3693	if (!readdir->cookie_offset)
3694	return;
3695	write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset, &cookie,
3696	sizeof(cookie));
3697	}
3698
3699	static inline int attributes_need_mount(u32 *bmval)
3700	{
3701	if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
3702	return 1;
3703	if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
3704	return 1;
3705	return 0;
3706	}
3707
3708	static __be32
3709	nfsd4_encode_entry4_fattr(struct nfsd4_readdir *cd, const char *name,
3710	int namlen)
3711	{
3712	struct svc_export *exp = cd->rd_fhp->fh_export;
3713	struct dentry *dentry;
3714	__be32 nfserr;
3715	int ignore_crossmnt = 0;
3716
3717	dentry = lookup_positive_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
3718	if (IS_ERR(ptr: dentry))
3719	return nfserrno(errno: PTR_ERR(ptr: dentry));
3720
3721	exp_get(exp);
3722	/*
3723	* In the case of a mountpoint, the client may be asking for
3724	* attributes that are only properties of the underlying filesystem
3725	* as opposed to the cross-mounted file system. In such a case,
3726	* we will not follow the cross mount and will fill the attribtutes
3727	* directly from the mountpoint dentry.
3728	*/
3729	if (nfsd_mountpoint(dentry, exp)) {
3730	int err;
3731
3732	if (!(exp->ex_flags & NFSEXP_V4ROOT)
3733	&& !attributes_need_mount(bmval: cd->rd_bmval)) {
3734	ignore_crossmnt = 1;
3735	goto out_encode;
3736	}
3737	/*
3738	* Why the heck aren't we just using nfsd_lookup??
3739	* Different "."/".." handling? Something else?
3740	* At least, add a comment here to explain....
3741	*/
3742	err = nfsd_cross_mnt(rqstp: cd->rd_rqstp, dpp: &dentry, expp: &exp);
3743	if (err) {
3744	nfserr = nfserrno(errno: err);
3745	goto out_put;
3746	}
3747	nfserr = check_nfsd_access(exp, rqstp: cd->rd_rqstp);
3748	if (nfserr)
3749	goto out_put;
3750
3751	}
3752	out_encode:
3753	nfserr = nfsd4_encode_fattr4(rqstp: cd->rd_rqstp, xdr: cd->xdr, NULL, exp, dentry,
3754	bmval: cd->rd_bmval, ignore_crossmnt);
3755	out_put:
3756	dput(dentry);
3757	exp_put(exp);
3758	return nfserr;
3759	}
3760
3761	static __be32
3762	nfsd4_encode_entry4_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
3763	{
3764	__be32 status;
3765
3766	/* attrmask */
3767	status = nfsd4_encode_bitmap4(xdr, FATTR4_WORD0_RDATTR_ERROR, bmval1: 0, bmval2: 0);
3768	if (status != nfs_ok)
3769	return status;
3770	/* attr_vals */
3771	if (xdr_stream_encode_u32(xdr, XDR_UNIT) != XDR_UNIT)
3772	return nfserr_resource;
3773	/* rdattr_error */
3774	if (xdr_stream_encode_be32(xdr, n: nfserr) != XDR_UNIT)
3775	return nfserr_resource;
3776	return nfs_ok;
3777	}
3778
3779	static int
3780	nfsd4_encode_entry4(void *ccdv, const char *name, int namlen,
3781	loff_t offset, u64 ino, unsigned int d_type)
3782	{
3783	struct readdir_cd *ccd = ccdv;
3784	struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
3785	struct xdr_stream *xdr = cd->xdr;
3786	int start_offset = xdr->buf->len;
3787	int cookie_offset;
3788	u32 name_and_cookie;
3789	int entry_bytes;
3790	__be32 nfserr = nfserr_toosmall;
3791
3792	/* In nfsv4, "." and ".." never make it onto the wire.. */
3793	if (name && isdotent(name, namlen)) {
3794	cd->common.err = nfs_ok;
3795	return 0;
3796	}
3797
3798	/* Encode the previous entry's cookie value */
3799	nfsd4_encode_entry4_nfs_cookie4(readdir: cd, offset);
3800
3801	if (xdr_stream_encode_item_present(xdr) != XDR_UNIT)
3802	goto fail;
3803
3804	/* Reserve send buffer space for this entry's cookie value. */
3805	cookie_offset = xdr->buf->len;
3806	if (nfsd4_encode_nfs_cookie4(xdr, OFFSET_MAX) != nfs_ok)
3807	goto fail;
3808	if (nfsd4_encode_component4(xdr, name, namlen) != nfs_ok)
3809	goto fail;
3810	nfserr = nfsd4_encode_entry4_fattr(cd, name, namlen);
3811	switch (nfserr) {
3812	case nfs_ok:
3813	break;
3814	case nfserr_resource:
3815	nfserr = nfserr_toosmall;
3816	goto fail;
3817	case nfserr_noent:
3818	xdr_truncate_encode(xdr, len: start_offset);
3819	goto skip_entry;
3820	case nfserr_jukebox:
3821	/*
3822	* The pseudoroot should only display dentries that lead to
3823	* exports. If we get EJUKEBOX here, then we can't tell whether
3824	* this entry should be included. Just fail the whole READDIR
3825	* with NFS4ERR_DELAY in that case, and hope that the situation
3826	* will resolve itself by the client's next attempt.
3827	*/
3828	if (cd->rd_fhp->fh_export->ex_flags & NFSEXP_V4ROOT)
3829	goto fail;
3830	fallthrough;
3831	default:
3832	/*
3833	* If the client requested the RDATTR_ERROR attribute,
3834	* we stuff the error code into this attribute
3835	* and continue. If this attribute was not requested,
3836	* then in accordance with the spec, we fail the
3837	* entire READDIR operation(!)
3838	*/
3839	if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3840	goto fail;
3841	if (nfsd4_encode_entry4_rdattr_error(xdr, nfserr)) {
3842	nfserr = nfserr_toosmall;
3843	goto fail;
3844	}
3845	}
3846	nfserr = nfserr_toosmall;
3847	entry_bytes = xdr->buf->len - start_offset;
3848	if (entry_bytes > cd->rd_maxcount)
3849	goto fail;
3850	cd->rd_maxcount -= entry_bytes;
3851	/*
3852	* RFC 3530 14.2.24 describes rd_dircount as only a "hint", and
3853	* notes that it could be zero. If it is zero, then the server
3854	* should enforce only the rd_maxcount value.
3855	*/
3856	if (cd->rd_dircount) {
3857	name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3858	if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3859	goto fail;
3860	cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3861	if (!cd->rd_dircount)
3862	cd->rd_maxcount = 0;
3863	}
3864
3865	cd->cookie_offset = cookie_offset;
3866	skip_entry:
3867	cd->common.err = nfs_ok;
3868	return 0;
3869	fail:
3870	xdr_truncate_encode(xdr, len: start_offset);
3871	cd->common.err = nfserr;
3872	return -EINVAL;
3873	}
3874
3875	static __be32
3876	nfsd4_encode_verifier4(struct xdr_stream *xdr, const nfs4_verifier *verf)
3877	{
3878	__be32 *p;
3879
3880	p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3881	if (!p)
3882	return nfserr_resource;
3883	memcpy(p, verf->data, sizeof(verf->data));
3884	return nfs_ok;
3885	}
3886
3887	static __be32
3888	nfsd4_encode_clientid4(struct xdr_stream *xdr, const clientid_t *clientid)
3889	{
3890	__be32 *p;
3891
3892	p = xdr_reserve_space(xdr, nbytes: sizeof(__be64));
3893	if (!p)
3894	return nfserr_resource;
3895	memcpy(p, clientid, sizeof(*clientid));
3896	return nfs_ok;
3897	}
3898
3899	/* This is a frequently-encoded item; open-coded for speed */
3900	static __be32
3901	nfsd4_encode_stateid4(struct xdr_stream *xdr, const stateid_t *sid)
3902	{
3903	__be32 *p;
3904
3905	p = xdr_reserve_space(xdr, NFS4_STATEID_SIZE);
3906	if (!p)
3907	return nfserr_resource;
3908	*p++ = cpu_to_be32(sid->si_generation);
3909	memcpy(p, &sid->si_opaque, sizeof(sid->si_opaque));
3910	return nfs_ok;
3911	}
3912
3913	static __be32
3914	nfsd4_encode_sessionid4(struct xdr_stream *xdr,
3915	const struct nfs4_sessionid *sessionid)
3916	{
3917	return nfsd4_encode_opaque_fixed(xdr, data: sessionid->data,
3918	NFS4_MAX_SESSIONID_LEN);
3919	}
3920
3921	static __be32
3922	nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr,
3923	union nfsd4_op_u *u)
3924	{
3925	struct nfsd4_access *access = &u->access;
3926	struct xdr_stream *xdr = resp->xdr;
3927	__be32 status;
3928
3929	/* supported */
3930	status = nfsd4_encode_uint32_t(xdr, val: access->ac_supported);
3931	if (status != nfs_ok)
3932	return status;
3933	/* access */
3934	return nfsd4_encode_uint32_t(xdr, val: access->ac_resp_access);
3935	}
3936
3937	static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3938	union nfsd4_op_u *u)
3939	{
3940	struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
3941	struct xdr_stream *xdr = resp->xdr;
3942
3943	/* bctsr_sessid */
3944	nfserr = nfsd4_encode_sessionid4(xdr, sessionid: &bcts->sessionid);
3945	if (nfserr != nfs_ok)
3946	return nfserr;
3947	/* bctsr_dir */
3948	if (xdr_stream_encode_u32(xdr, n: bcts->dir) != XDR_UNIT)
3949	return nfserr_resource;
3950	/* bctsr_use_conn_in_rdma_mode */
3951	return nfsd4_encode_bool(xdr, val: false);
3952	}
3953
3954	static __be32
3955	nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr,
3956	union nfsd4_op_u *u)
3957	{
3958	struct nfsd4_close *close = &u->close;
3959	struct xdr_stream *xdr = resp->xdr;
3960
3961	/* open_stateid */
3962	return nfsd4_encode_stateid4(xdr, sid: &close->cl_stateid);
3963	}
3964
3965
3966	static __be32
3967	nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr,
3968	union nfsd4_op_u *u)
3969	{
3970	struct nfsd4_commit *commit = &u->commit;
3971
3972	return nfsd4_encode_verifier4(xdr: resp->xdr, verf: &commit->co_verf);
3973	}
3974
3975	static __be32
3976	nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr,
3977	union nfsd4_op_u *u)
3978	{
3979	struct nfsd4_create *create = &u->create;
3980	struct xdr_stream *xdr = resp->xdr;
3981
3982	/* cinfo */
3983	nfserr = nfsd4_encode_change_info4(xdr, c: &create->cr_cinfo);
3984	if (nfserr)
3985	return nfserr;
3986	/* attrset */
3987	return nfsd4_encode_bitmap4(xdr, bmval0: create->cr_bmval[0],
3988	bmval1: create->cr_bmval[1], bmval2: create->cr_bmval[2]);
3989	}
3990
3991	static __be32
3992	nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr,
3993	union nfsd4_op_u *u)
3994	{
3995	struct nfsd4_getattr *getattr = &u->getattr;
3996	struct svc_fh *fhp = getattr->ga_fhp;
3997	struct xdr_stream *xdr = resp->xdr;
3998
3999	/* obj_attributes */
4000	return nfsd4_encode_fattr4(rqstp: resp->rqstp, xdr, fhp, exp: fhp->fh_export,
4001	dentry: fhp->fh_dentry, bmval: getattr->ga_bmval, ignore_crossmnt: 0);
4002	}
4003
4004	static __be32
4005	nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr,
4006	union nfsd4_op_u *u)
4007	{
4008	struct xdr_stream *xdr = resp->xdr;
4009	struct svc_fh *fhp = u->getfh;
4010
4011	/* object */
4012	return nfsd4_encode_nfs_fh4(xdr, fh_handle: &fhp->fh_handle);
4013	}
4014
4015	static __be32
4016	nfsd4_encode_lock_owner4(struct xdr_stream *xdr, const clientid_t *clientid,
4017	const struct xdr_netobj *owner)
4018	{
4019	__be32 status;
4020
4021	/* clientid */
4022	status = nfsd4_encode_clientid4(xdr, clientid);
4023	if (status != nfs_ok)
4024	return status;
4025	/* owner */
4026	return nfsd4_encode_opaque(xdr, data: owner->data, size: owner->len);
4027	}
4028
4029	static __be32
4030	nfsd4_encode_lock4denied(struct xdr_stream *xdr,
4031	const struct nfsd4_lock_denied *ld)
4032	{
4033	__be32 status;
4034
4035	/* offset */
4036	status = nfsd4_encode_offset4(xdr, ld->ld_start);
4037	if (status != nfs_ok)
4038	return status;
4039	/* length */
4040	status = nfsd4_encode_length4(xdr, ld->ld_length);
4041	if (status != nfs_ok)
4042	return status;
4043	/* locktype */
4044	if (xdr_stream_encode_u32(xdr, n: ld->ld_type) != XDR_UNIT)
4045	return nfserr_resource;
4046	/* owner */
4047	return nfsd4_encode_lock_owner4(xdr, clientid: &ld->ld_clientid,
4048	owner: &ld->ld_owner);
4049	}
4050
4051	static __be32
4052	nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr,
4053	union nfsd4_op_u *u)
4054	{
4055	struct nfsd4_lock *lock = &u->lock;
4056	struct xdr_stream *xdr = resp->xdr;
4057	__be32 status;
4058
4059	switch (nfserr) {
4060	case nfs_ok:
4061	/* resok4 */
4062	status = nfsd4_encode_stateid4(xdr, sid: &lock->lk_resp_stateid);
4063	break;
4064	case nfserr_denied:
4065	/* denied */
4066	status = nfsd4_encode_lock4denied(xdr, ld: &lock->lk_denied);
4067	break;
4068	default:
4069	return nfserr;
4070	}
4071	return status != nfs_ok ? status : nfserr;
4072	}
4073
4074	static __be32
4075	nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr,
4076	union nfsd4_op_u *u)
4077	{
4078	struct nfsd4_lockt *lockt = &u->lockt;
4079	struct xdr_stream *xdr = resp->xdr;
4080	__be32 status;
4081
4082	if (nfserr == nfserr_denied) {
4083	/* denied */
4084	status = nfsd4_encode_lock4denied(xdr, ld: &lockt->lt_denied);
4085	if (status != nfs_ok)
4086	return status;
4087	}
4088	return nfserr;
4089	}
4090
4091	static __be32
4092	nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr,
4093	union nfsd4_op_u *u)
4094	{
4095	struct nfsd4_locku *locku = &u->locku;
4096	struct xdr_stream *xdr = resp->xdr;
4097
4098	/* lock_stateid */
4099	return nfsd4_encode_stateid4(xdr, sid: &locku->lu_stateid);
4100	}
4101
4102
4103	static __be32
4104	nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr,
4105	union nfsd4_op_u *u)
4106	{
4107	struct nfsd4_link *link = &u->link;
4108	struct xdr_stream *xdr = resp->xdr;
4109
4110	return nfsd4_encode_change_info4(xdr, c: &link->li_cinfo);
4111	}
4112
4113	/*
4114	* This implementation does not yet support returning an ACE in an
4115	* OPEN that offers a delegation.
4116	*/
4117	static __be32
4118	nfsd4_encode_open_nfsace4(struct xdr_stream *xdr)
4119	{
4120	__be32 status;
4121
4122	/* type */
4123	status = nfsd4_encode_acetype4(xdr, NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
4124	if (status != nfs_ok)
4125	return nfserr_resource;
4126	/* flag */
4127	status = nfsd4_encode_aceflag4(xdr, 0);
4128	if (status != nfs_ok)
4129	return nfserr_resource;
4130	/* access mask */
4131	status = nfsd4_encode_acemask4(xdr, 0);
4132	if (status != nfs_ok)
4133	return nfserr_resource;
4134	/* who - empty for now */
4135	if (xdr_stream_encode_u32(xdr, n: 0) != XDR_UNIT)
4136	return nfserr_resource;
4137	return nfs_ok;
4138	}
4139
4140	static __be32
4141	nfsd4_encode_open_read_delegation4(struct xdr_stream *xdr, struct nfsd4_open *open)
4142	{
4143	__be32 status;
4144
4145	/* stateid */
4146	status = nfsd4_encode_stateid4(xdr, sid: &open->op_delegate_stateid);
4147	if (status != nfs_ok)
4148	return status;
4149	/* recall */
4150	status = nfsd4_encode_bool(xdr, val: open->op_recall);
4151	if (status != nfs_ok)
4152	return status;
4153	/* permissions */
4154	return nfsd4_encode_open_nfsace4(xdr);
4155	}
4156
4157	static __be32
4158	nfsd4_encode_nfs_space_limit4(struct xdr_stream *xdr, u64 filesize)
4159	{
4160	/* limitby */
4161	if (xdr_stream_encode_u32(xdr, n: NFS4_LIMIT_SIZE) != XDR_UNIT)
4162	return nfserr_resource;
4163	/* filesize */
4164	return nfsd4_encode_uint64_t(xdr, val: filesize);
4165	}
4166
4167	static __be32
4168	nfsd4_encode_open_write_delegation4(struct xdr_stream *xdr,
4169	struct nfsd4_open *open)
4170	{
4171	__be32 status;
4172
4173	/* stateid */
4174	status = nfsd4_encode_stateid4(xdr, sid: &open->op_delegate_stateid);
4175	if (status != nfs_ok)
4176	return status;
4177	/* recall */
4178	status = nfsd4_encode_bool(xdr, val: open->op_recall);
4179	if (status != nfs_ok)
4180	return status;
4181	/* space_limit */
4182	status = nfsd4_encode_nfs_space_limit4(xdr, filesize: 0);
4183	if (status != nfs_ok)
4184	return status;
4185	return nfsd4_encode_open_nfsace4(xdr);
4186	}
4187
4188	static __be32
4189	nfsd4_encode_open_none_delegation4(struct xdr_stream *xdr,
4190	struct nfsd4_open *open)
4191	{
4192	__be32 status = nfs_ok;
4193
4194	/* ond_why */
4195	if (xdr_stream_encode_u32(xdr, n: open->op_why_no_deleg) != XDR_UNIT)
4196	return nfserr_resource;
4197	switch (open->op_why_no_deleg) {
4198	case WND4_CONTENTION:
4199	/* ond_server_will_push_deleg */
4200	status = nfsd4_encode_bool(xdr, val: false);
4201	break;
4202	case WND4_RESOURCE:
4203	/* ond_server_will_signal_avail */
4204	status = nfsd4_encode_bool(xdr, val: false);
4205	}
4206	return status;
4207	}
4208
4209	static __be32
4210	nfsd4_encode_open_delegation4(struct xdr_stream *xdr, struct nfsd4_open *open)
4211	{
4212	__be32 status;
4213
4214	/* delegation_type */
4215	if (xdr_stream_encode_u32(xdr, n: open->op_delegate_type) != XDR_UNIT)
4216	return nfserr_resource;
4217	switch (open->op_delegate_type) {
4218	case NFS4_OPEN_DELEGATE_NONE:
4219	status = nfs_ok;
4220	break;
4221	case NFS4_OPEN_DELEGATE_READ:
4222	/* read */
4223	status = nfsd4_encode_open_read_delegation4(xdr, open);
4224	break;
4225	case NFS4_OPEN_DELEGATE_WRITE:
4226	/* write */
4227	status = nfsd4_encode_open_write_delegation4(xdr, open);
4228	break;
4229	case NFS4_OPEN_DELEGATE_NONE_EXT:
4230	/* od_whynone */
4231	status = nfsd4_encode_open_none_delegation4(xdr, open);
4232	break;
4233	default:
4234	status = nfserr_serverfault;
4235	}
4236
4237	return status;
4238	}
4239
4240	static __be32
4241	nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr,
4242	union nfsd4_op_u *u)
4243	{
4244	struct nfsd4_open *open = &u->open;
4245	struct xdr_stream *xdr = resp->xdr;
4246
4247	/* stateid */
4248	nfserr = nfsd4_encode_stateid4(xdr, sid: &open->op_stateid);
4249	if (nfserr != nfs_ok)
4250	return nfserr;
4251	/* cinfo */
4252	nfserr = nfsd4_encode_change_info4(xdr, c: &open->op_cinfo);
4253	if (nfserr != nfs_ok)
4254	return nfserr;
4255	/* rflags */
4256	nfserr = nfsd4_encode_uint32_t(xdr, val: open->op_rflags);
4257	if (nfserr != nfs_ok)
4258	return nfserr;
4259	/* attrset */
4260	nfserr = nfsd4_encode_bitmap4(xdr, bmval0: open->op_bmval[0],
4261	bmval1: open->op_bmval[1], bmval2: open->op_bmval[2]);
4262	if (nfserr != nfs_ok)
4263	return nfserr;
4264	/* delegation */
4265	return nfsd4_encode_open_delegation4(xdr, open);
4266	}
4267
4268	static __be32
4269	nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr,
4270	union nfsd4_op_u *u)
4271	{
4272	struct nfsd4_open_confirm *oc = &u->open_confirm;
4273	struct xdr_stream *xdr = resp->xdr;
4274
4275	/* open_stateid */
4276	return nfsd4_encode_stateid4(xdr, sid: &oc->oc_resp_stateid);
4277	}
4278
4279	static __be32
4280	nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr,
4281	union nfsd4_op_u *u)
4282	{
4283	struct nfsd4_open_downgrade *od = &u->open_downgrade;
4284	struct xdr_stream *xdr = resp->xdr;
4285
4286	/* open_stateid */
4287	return nfsd4_encode_stateid4(xdr, sid: &od->od_stateid);
4288	}
4289
4290	/*
4291	* The operation of this function assumes that this is the only
4292	* READ operation in the COMPOUND. If there are multiple READs,
4293	* we use nfsd4_encode_readv().
4294	*/
4295	static __be32 nfsd4_encode_splice_read(
4296	struct nfsd4_compoundres *resp,
4297	struct nfsd4_read *read,
4298	struct file *file, unsigned long maxcount)
4299	{
4300	struct xdr_stream *xdr = resp->xdr;
4301	struct xdr_buf *buf = xdr->buf;
4302	int status, space_left;
4303	__be32 nfserr;
4304
4305	/*
4306	* Make sure there is room at the end of buf->head for
4307	* svcxdr_encode_opaque_pages() to create a tail buffer
4308	* to XDR-pad the payload.
4309	*/
4310	if (xdr->iov != xdr->buf->head || xdr->end - xdr->p < 1)
4311	return nfserr_resource;
4312
4313	nfserr = nfsd_splice_read(rqstp: read->rd_rqstp, fhp: read->rd_fhp,
4314	file, offset: read->rd_offset, count: &maxcount,
4315	eof: &read->rd_eof);
4316	read->rd_length = maxcount;
4317	if (nfserr)
4318	goto out_err;
4319	svcxdr_encode_opaque_pages(rqstp: read->rd_rqstp, xdr, pages: buf->pages,
4320	base: buf->page_base, len: maxcount);
4321	status = svc_encode_result_payload(rqstp: read->rd_rqstp,
4322	offset: buf->head[0].iov_len, length: maxcount);
4323	if (status) {
4324	nfserr = nfserrno(errno: status);
4325	goto out_err;
4326	}
4327
4328	/*
4329	* Prepare to encode subsequent operations.
4330	*
4331	* xdr_truncate_encode() is not safe to use after a successful
4332	* splice read has been done, so the following stream
4333	* manipulations are open-coded.
4334	*/
4335	space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
4336	buf->buflen - buf->len);
4337	buf->buflen = buf->len + space_left;
4338	xdr->end = (__be32 *)((void *)xdr->end + space_left);
4339
4340	return nfs_ok;
4341
4342	out_err:
4343	/*
4344	* nfsd_splice_actor may have already messed with the
4345	* page length; reset it so as not to confuse
4346	* xdr_truncate_encode in our caller.
4347	*/
4348	buf->page_len = 0;
4349	return nfserr;
4350	}
4351
4352	static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
4353	struct nfsd4_read *read,
4354	struct file *file, unsigned long maxcount)
4355	{
4356	struct xdr_stream *xdr = resp->xdr;
4357	unsigned int base = xdr->buf->page_len & ~PAGE_MASK;
4358	unsigned int starting_len = xdr->buf->len;
4359	__be32 zero = xdr_zero;
4360	__be32 nfserr;
4361
4362	if (xdr_reserve_space_vec(xdr, nbytes: maxcount) < 0)
4363	return nfserr_resource;
4364
4365	nfserr = nfsd_iter_read(rqstp: resp->rqstp, fhp: read->rd_fhp, file,
4366	offset: read->rd_offset, count: &maxcount, base,
4367	eof: &read->rd_eof);
4368	read->rd_length = maxcount;
4369	if (nfserr)
4370	return nfserr;
4371	if (svc_encode_result_payload(rqstp: resp->rqstp, offset: starting_len, length: maxcount))
4372	return nfserr_io;
4373	xdr_truncate_encode(xdr, len: starting_len + xdr_align_size(n: maxcount));
4374
4375	write_bytes_to_xdr_buf(xdr->buf, starting_len + maxcount, &zero,
4376	xdr_pad_size(n: maxcount));
4377	return nfs_ok;
4378	}
4379
4380	static __be32
4381	nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
4382	union nfsd4_op_u *u)
4383	{
4384	struct nfsd4_compoundargs *argp = resp->rqstp->rq_argp;
4385	struct nfsd4_read *read = &u->read;
4386	struct xdr_stream *xdr = resp->xdr;
4387	int starting_len = xdr->buf->len;
4388	bool splice_ok = argp->splice_ok;
4389	unsigned long maxcount;
4390	struct file *file;
4391	__be32 *p;
4392
4393	if (nfserr)
4394	return nfserr;
4395	file = read->rd_nf->nf_file;
4396
4397	p = xdr_reserve_space(xdr, nbytes: 8); /* eof flag and byte count */
4398	if (!p) {
4399	WARN_ON_ONCE(splice_ok);
4400	return nfserr_resource;
4401	}
4402	if (resp->xdr->buf->page_len && splice_ok) {
4403	WARN_ON_ONCE(1);
4404	return nfserr_serverfault;
4405	}
4406	xdr_commit_encode(xdr);
4407
4408	maxcount = min_t(unsigned long, read->rd_length,
4409	(xdr->buf->buflen - xdr->buf->len));
4410
4411	if (file->f_op->splice_read && splice_ok)
4412	nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
4413	else
4414	nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
4415	if (nfserr) {
4416	xdr_truncate_encode(xdr, len: starting_len);
4417	return nfserr;
4418	}
4419
4420	p = xdr_encode_bool(p, n: read->rd_eof);
4421	*p = cpu_to_be32(read->rd_length);
4422	return nfs_ok;
4423	}
4424
4425	static __be32
4426	nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr,
4427	union nfsd4_op_u *u)
4428	{
4429	struct nfsd4_readlink *readlink = &u->readlink;
4430	__be32 *p, *maxcount_p, zero = xdr_zero;
4431	struct xdr_stream *xdr = resp->xdr;
4432	int length_offset = xdr->buf->len;
4433	int maxcount, status;
4434
4435	maxcount_p = xdr_reserve_space(xdr, XDR_UNIT);
4436	if (!maxcount_p)
4437	return nfserr_resource;
4438	maxcount = PAGE_SIZE;
4439
4440	p = xdr_reserve_space(xdr, nbytes: maxcount);
4441	if (!p)
4442	return nfserr_resource;
4443	/*
4444	* XXX: By default, vfs_readlink() will truncate symlinks if they
4445	* would overflow the buffer. Is this kosher in NFSv4? If not, one
4446	* easy fix is: if vfs_readlink() precisely fills the buffer, assume
4447	* that truncation occurred, and return NFS4ERR_RESOURCE.
4448	*/
4449	nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
4450	(char *)p, &maxcount);
4451	if (nfserr == nfserr_isdir)
4452	nfserr = nfserr_inval;
4453	if (nfserr)
4454	goto out_err;
4455	status = svc_encode_result_payload(rqstp: readlink->rl_rqstp, offset: length_offset,
4456	length: maxcount);
4457	if (status) {
4458	nfserr = nfserrno(errno: status);
4459	goto out_err;
4460	}
4461	*maxcount_p = cpu_to_be32(maxcount);
4462	xdr_truncate_encode(xdr, len: length_offset + 4 + xdr_align_size(n: maxcount));
4463	write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount, &zero,
4464	xdr_pad_size(n: maxcount));
4465	return nfs_ok;
4466
4467	out_err:
4468	xdr_truncate_encode(xdr, len: length_offset);
4469	return nfserr;
4470	}
4471
4472	static __be32 nfsd4_encode_dirlist4(struct xdr_stream *xdr,
4473	struct nfsd4_readdir *readdir,
4474	u32 max_payload)
4475	{
4476	int bytes_left, maxcount, starting_len = xdr->buf->len;
4477	loff_t offset;
4478	__be32 status;
4479
4480	/*
4481	* Number of bytes left for directory entries allowing for the
4482	* final 8 bytes of the readdir and a following failed op.
4483	*/
4484	bytes_left = xdr->buf->buflen - xdr->buf->len -
4485	COMPOUND_ERR_SLACK_SPACE - XDR_UNIT * 2;
4486	if (bytes_left < 0)
4487	return nfserr_resource;
4488	maxcount = min_t(u32, readdir->rd_maxcount, max_payload);
4489
4490	/*
4491	* The RFC defines rd_maxcount as the size of the
4492	* READDIR4resok structure, which includes the verifier
4493	* and the 8 bytes encoded at the end of this function.
4494	*/
4495	if (maxcount < XDR_UNIT * 4)
4496	return nfserr_toosmall;
4497	maxcount = min_t(int, maxcount - XDR_UNIT * 4, bytes_left);
4498
4499	/* RFC 3530 14.2.24 allows us to ignore dircount when it's 0 */
4500	if (!readdir->rd_dircount)
4501	readdir->rd_dircount = max_payload;
4502
4503	/* *entries */
4504	readdir->xdr = xdr;
4505	readdir->rd_maxcount = maxcount;
4506	readdir->common.err = 0;
4507	readdir->cookie_offset = 0;
4508	offset = readdir->rd_cookie;
4509	status = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp, &offset,
4510	&readdir->common, nfsd4_encode_entry4);
4511	if (status)
4512	return status;
4513	if (readdir->common.err == nfserr_toosmall &&
4514	xdr->buf->len == starting_len) {
4515	/* No entries were encoded. Which limit did we hit? */
4516	if (maxcount - XDR_UNIT * 4 < bytes_left)
4517	/* It was the fault of rd_maxcount */
4518	return nfserr_toosmall;
4519	/* We ran out of buffer space */
4520	return nfserr_resource;
4521	}
4522	/* Encode the final entry's cookie value */
4523	nfsd4_encode_entry4_nfs_cookie4(readdir, offset);
4524	/* No entries follow */
4525	if (xdr_stream_encode_item_absent(xdr) != XDR_UNIT)
4526	return nfserr_resource;
4527
4528	/* eof */
4529	return nfsd4_encode_bool(xdr, val: readdir->common.err == nfserr_eof);
4530	}
4531
4532	static __be32
4533	nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr,
4534	union nfsd4_op_u *u)
4535	{
4536	struct nfsd4_readdir *readdir = &u->readdir;
4537	struct xdr_stream *xdr = resp->xdr;
4538	int starting_len = xdr->buf->len;
4539
4540	/* cookieverf */
4541	nfserr = nfsd4_encode_verifier4(xdr, verf: &readdir->rd_verf);
4542	if (nfserr != nfs_ok)
4543	return nfserr;
4544
4545	/* reply */
4546	nfserr = nfsd4_encode_dirlist4(xdr, readdir, max_payload: svc_max_payload(rqstp: resp->rqstp));
4547	if (nfserr != nfs_ok)
4548	xdr_truncate_encode(xdr, len: starting_len);
4549	return nfserr;
4550	}
4551
4552	static __be32
4553	nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr,
4554	union nfsd4_op_u *u)
4555	{
4556	struct nfsd4_remove *remove = &u->remove;
4557	struct xdr_stream *xdr = resp->xdr;
4558
4559	return nfsd4_encode_change_info4(xdr, c: &remove->rm_cinfo);
4560	}
4561
4562	static __be32
4563	nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr,
4564	union nfsd4_op_u *u)
4565	{
4566	struct nfsd4_rename *rename = &u->rename;
4567	struct xdr_stream *xdr = resp->xdr;
4568
4569	nfserr = nfsd4_encode_change_info4(xdr, c: &rename->rn_sinfo);
4570	if (nfserr)
4571	return nfserr;
4572	return nfsd4_encode_change_info4(xdr, c: &rename->rn_tinfo);
4573	}
4574
4575	static __be32
4576	nfsd4_encode_rpcsec_gss_info(struct xdr_stream *xdr,
4577	struct rpcsec_gss_info *info)
4578	{
4579	__be32 status;
4580
4581	/* oid */
4582	if (xdr_stream_encode_opaque(xdr, ptr: info->oid.data, len: info->oid.len) < 0)
4583	return nfserr_resource;
4584	/* qop */
4585	status = nfsd4_encode_qop4(xdr, info->qop);
4586	if (status != nfs_ok)
4587	return status;
4588	/* service */
4589	if (xdr_stream_encode_u32(xdr, n: info->service) != XDR_UNIT)
4590	return nfserr_resource;
4591
4592	return nfs_ok;
4593	}
4594
4595	static __be32
4596	nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp)
4597	{
4598	u32 i, nflavs, supported;
4599	struct exp_flavor_info *flavs;
4600	struct exp_flavor_info def_flavs[2];
4601	static bool report = true;
4602	__be32 *flavorsp;
4603	__be32 status;
4604
4605	if (exp->ex_nflavors) {
4606	flavs = exp->ex_flavors;
4607	nflavs = exp->ex_nflavors;
4608	} else { /* Handling of some defaults in absence of real secinfo: */
4609	flavs = def_flavs;
4610	if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
4611	nflavs = 2;
4612	flavs[0].pseudoflavor = RPC_AUTH_UNIX;
4613	flavs[1].pseudoflavor = RPC_AUTH_NULL;
4614	} else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
4615	nflavs = 1;
4616	flavs[0].pseudoflavor
4617	= svcauth_gss_flavor(dom: exp->ex_client);
4618	} else {
4619	nflavs = 1;
4620	flavs[0].pseudoflavor
4621	= exp->ex_client->flavour->flavour;
4622	}
4623	}
4624
4625	supported = 0;
4626	flavorsp = xdr_reserve_space(xdr, XDR_UNIT);
4627	if (!flavorsp)
4628	return nfserr_resource;
4629
4630	for (i = 0; i < nflavs; i++) {
4631	rpc_authflavor_t pf = flavs[i].pseudoflavor;
4632	struct rpcsec_gss_info info;
4633
4634	if (rpcauth_get_gssinfo(pf, &info) == 0) {
4635	supported++;
4636
4637	/* flavor */
4638	status = nfsd4_encode_uint32_t(xdr, val: RPC_AUTH_GSS);
4639	if (status != nfs_ok)
4640	return status;
4641	/* flavor_info */
4642	status = nfsd4_encode_rpcsec_gss_info(xdr, info: &info);
4643	if (status != nfs_ok)
4644	return status;
4645	} else if (pf < RPC_AUTH_MAXFLAVOR) {
4646	supported++;
4647
4648	/* flavor */
4649	status = nfsd4_encode_uint32_t(xdr, val: pf);
4650	if (status != nfs_ok)
4651	return status;
4652	} else {
4653	if (report)
4654	pr_warn("NFS: SECINFO: security flavor %u "
4655	"is not supported\n", pf);
4656	}
4657	}
4658
4659	if (nflavs != supported)
4660	report = false;
4661	*flavorsp = cpu_to_be32(supported);
4662	return 0;
4663	}
4664
4665	static __be32
4666	nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4667	union nfsd4_op_u *u)
4668	{
4669	struct nfsd4_secinfo *secinfo = &u->secinfo;
4670	struct xdr_stream *xdr = resp->xdr;
4671
4672	return nfsd4_do_encode_secinfo(xdr, exp: secinfo->si_exp);
4673	}
4674
4675	static __be32
4676	nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
4677	union nfsd4_op_u *u)
4678	{
4679	struct nfsd4_secinfo_no_name *secinfo = &u->secinfo_no_name;
4680	struct xdr_stream *xdr = resp->xdr;
4681
4682	return nfsd4_do_encode_secinfo(xdr, exp: secinfo->sin_exp);
4683	}
4684
4685	static __be32
4686	nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr,
4687	union nfsd4_op_u *u)
4688	{
4689	struct nfsd4_setattr *setattr = &u->setattr;
4690	__be32 status;
4691
4692	switch (nfserr) {
4693	case nfs_ok:
4694	/* attrsset */
4695	status = nfsd4_encode_bitmap4(xdr: resp->xdr, bmval0: setattr->sa_bmval[0],
4696	bmval1: setattr->sa_bmval[1],
4697	bmval2: setattr->sa_bmval[2]);
4698	break;
4699	default:
4700	/* attrsset */
4701	status = nfsd4_encode_bitmap4(xdr: resp->xdr, bmval0: 0, bmval1: 0, bmval2: 0);
4702	}
4703	return status != nfs_ok ? status : nfserr;
4704	}
4705
4706	static __be32
4707	nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr,
4708	union nfsd4_op_u *u)
4709	{
4710	struct nfsd4_setclientid *scd = &u->setclientid;
4711	struct xdr_stream *xdr = resp->xdr;
4712
4713	if (!nfserr) {
4714	nfserr = nfsd4_encode_clientid4(xdr, clientid: &scd->se_clientid);
4715	if (nfserr != nfs_ok)
4716	goto out;
4717	nfserr = nfsd4_encode_verifier4(xdr, verf: &scd->se_confirm);
4718	} else if (nfserr == nfserr_clid_inuse) {
4719	/* empty network id */
4720	if (xdr_stream_encode_u32(xdr, n: 0) < 0) {
4721	nfserr = nfserr_resource;
4722	goto out;
4723	}
4724	/* empty universal address */
4725	if (xdr_stream_encode_u32(xdr, n: 0) < 0) {
4726	nfserr = nfserr_resource;
4727	goto out;
4728	}
4729	}
4730	out:
4731	return nfserr;
4732	}
4733
4734	static __be32
4735	nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr,
4736	union nfsd4_op_u *u)
4737	{
4738	struct nfsd4_write *write = &u->write;
4739	struct xdr_stream *xdr = resp->xdr;
4740
4741	/* count */
4742	nfserr = nfsd4_encode_count4(xdr, write->wr_bytes_written);
4743	if (nfserr)
4744	return nfserr;
4745	/* committed */
4746	if (xdr_stream_encode_u32(xdr, n: write->wr_how_written) != XDR_UNIT)
4747	return nfserr_resource;
4748	/* writeverf */
4749	return nfsd4_encode_verifier4(xdr, verf: &write->wr_verifier);
4750	}
4751
4752	static __be32
4753	nfsd4_encode_state_protect_ops4(struct xdr_stream *xdr,
4754	struct nfsd4_exchange_id *exid)
4755	{
4756	__be32 status;
4757
4758	/* spo_must_enforce */
4759	status = nfsd4_encode_bitmap4(xdr, bmval0: exid->spo_must_enforce[0],
4760	bmval1: exid->spo_must_enforce[1],
4761	bmval2: exid->spo_must_enforce[2]);
4762	if (status != nfs_ok)
4763	return status;
4764	/* spo_must_allow */
4765	return nfsd4_encode_bitmap4(xdr, bmval0: exid->spo_must_allow[0],
4766	bmval1: exid->spo_must_allow[1],
4767	bmval2: exid->spo_must_allow[2]);
4768	}
4769
4770	static __be32
4771	nfsd4_encode_state_protect4_r(struct xdr_stream *xdr, struct nfsd4_exchange_id *exid)
4772	{
4773	__be32 status;
4774
4775	if (xdr_stream_encode_u32(xdr, n: exid->spa_how) != XDR_UNIT)
4776	return nfserr_resource;
4777	switch (exid->spa_how) {
4778	case SP4_NONE:
4779	status = nfs_ok;
4780	break;
4781	case SP4_MACH_CRED:
4782	/* spr_mach_ops */
4783	status = nfsd4_encode_state_protect_ops4(xdr, exid);
4784	break;
4785	default:
4786	status = nfserr_serverfault;
4787	}
4788	return status;
4789	}
4790
4791	static __be32
4792	nfsd4_encode_server_owner4(struct xdr_stream *xdr, struct svc_rqst *rqstp)
4793	{
4794	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), id: nfsd_net_id);
4795	__be32 status;
4796
4797	/* so_minor_id */
4798	status = nfsd4_encode_uint64_t(xdr, val: 0);
4799	if (status != nfs_ok)
4800	return status;
4801	/* so_major_id */
4802	return nfsd4_encode_opaque(xdr, data: nn->nfsd_name, strlen(nn->nfsd_name));
4803	}
4804
4805	static __be32
4806	nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
4807	union nfsd4_op_u *u)
4808	{
4809	struct nfsd_net *nn = net_generic(SVC_NET(resp->rqstp), id: nfsd_net_id);
4810	struct nfsd4_exchange_id *exid = &u->exchange_id;
4811	struct xdr_stream *xdr = resp->xdr;
4812
4813	/* eir_clientid */
4814	nfserr = nfsd4_encode_clientid4(xdr, clientid: &exid->clientid);
4815	if (nfserr != nfs_ok)
4816	return nfserr;
4817	/* eir_sequenceid */
4818	nfserr = nfsd4_encode_sequenceid4(xdr, exid->seqid);
4819	if (nfserr != nfs_ok)
4820	return nfserr;
4821	/* eir_flags */
4822	nfserr = nfsd4_encode_uint32_t(xdr, val: exid->flags);
4823	if (nfserr != nfs_ok)
4824	return nfserr;
4825	/* eir_state_protect */
4826	nfserr = nfsd4_encode_state_protect4_r(xdr, exid);
4827	if (nfserr != nfs_ok)
4828	return nfserr;
4829	/* eir_server_owner */
4830	nfserr = nfsd4_encode_server_owner4(xdr, rqstp: resp->rqstp);
4831	if (nfserr != nfs_ok)
4832	return nfserr;
4833	/* eir_server_scope */
4834	nfserr = nfsd4_encode_opaque(xdr, data: nn->nfsd_name,
4835	strlen(nn->nfsd_name));
4836	if (nfserr != nfs_ok)
4837	return nfserr;
4838	/* eir_server_impl_id<1> */
4839	if (xdr_stream_encode_u32(xdr, n: 0) != XDR_UNIT)
4840	return nfserr_resource;
4841
4842	return nfs_ok;
4843	}
4844
4845	static __be32
4846	nfsd4_encode_channel_attrs4(struct xdr_stream *xdr,
4847	const struct nfsd4_channel_attrs *attrs)
4848	{
4849	__be32 status;
4850
4851	/* ca_headerpadsize */
4852	status = nfsd4_encode_count4(xdr, 0);
4853	if (status != nfs_ok)
4854	return status;
4855	/* ca_maxrequestsize */
4856	status = nfsd4_encode_count4(xdr, attrs->maxreq_sz);
4857	if (status != nfs_ok)
4858	return status;
4859	/* ca_maxresponsesize */
4860	status = nfsd4_encode_count4(xdr, attrs->maxresp_sz);
4861	if (status != nfs_ok)
4862	return status;
4863	/* ca_maxresponsesize_cached */
4864	status = nfsd4_encode_count4(xdr, attrs->maxresp_cached);
4865	if (status != nfs_ok)
4866	return status;
4867	/* ca_maxoperations */
4868	status = nfsd4_encode_count4(xdr, attrs->maxops);
4869	if (status != nfs_ok)
4870	return status;
4871	/* ca_maxrequests */
4872	status = nfsd4_encode_count4(xdr, attrs->maxreqs);
4873	if (status != nfs_ok)
4874	return status;
4875	/* ca_rdma_ird<1> */
4876	if (xdr_stream_encode_u32(xdr, n: attrs->nr_rdma_attrs) != XDR_UNIT)
4877	return nfserr_resource;
4878	if (attrs->nr_rdma_attrs)
4879	return nfsd4_encode_uint32_t(xdr, val: attrs->rdma_attrs);
4880	return nfs_ok;
4881	}
4882
4883	static __be32
4884	nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
4885	union nfsd4_op_u *u)
4886	{
4887	struct nfsd4_create_session *sess = &u->create_session;
4888	struct xdr_stream *xdr = resp->xdr;
4889
4890	/* csr_sessionid */
4891	nfserr = nfsd4_encode_sessionid4(xdr, sessionid: &sess->sessionid);
4892	if (nfserr != nfs_ok)
4893	return nfserr;
4894	/* csr_sequence */
4895	nfserr = nfsd4_encode_sequenceid4(xdr, sess->seqid);
4896	if (nfserr != nfs_ok)
4897	return nfserr;
4898	/* csr_flags */
4899	nfserr = nfsd4_encode_uint32_t(xdr, val: sess->flags);
4900	if (nfserr != nfs_ok)
4901	return nfserr;
4902	/* csr_fore_chan_attrs */
4903	nfserr = nfsd4_encode_channel_attrs4(xdr, attrs: &sess->fore_channel);
4904	if (nfserr != nfs_ok)
4905	return nfserr;
4906	/* csr_back_chan_attrs */
4907	return nfsd4_encode_channel_attrs4(xdr, attrs: &sess->back_channel);
4908	}
4909
4910	static __be32
4911	nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4912	union nfsd4_op_u *u)
4913	{
4914	struct nfsd4_sequence *seq = &u->sequence;
4915	struct xdr_stream *xdr = resp->xdr;
4916
4917	/* sr_sessionid */
4918	nfserr = nfsd4_encode_sessionid4(xdr, sessionid: &seq->sessionid);
4919	if (nfserr != nfs_ok)
4920	return nfserr;
4921	/* sr_sequenceid */
4922	nfserr = nfsd4_encode_sequenceid4(xdr, seq->seqid);
4923	if (nfserr != nfs_ok)
4924	return nfserr;
4925	/* sr_slotid */
4926	nfserr = nfsd4_encode_slotid4(xdr, seq->slotid);
4927	if (nfserr != nfs_ok)
4928	return nfserr;
4929	/* Note slotid's are numbered from zero: */
4930	/* sr_highest_slotid */
4931	nfserr = nfsd4_encode_slotid4(xdr, seq->maxslots - 1);
4932	if (nfserr != nfs_ok)
4933	return nfserr;
4934	/* sr_target_highest_slotid */
4935	nfserr = nfsd4_encode_slotid4(xdr, seq->maxslots - 1);
4936	if (nfserr != nfs_ok)
4937	return nfserr;
4938	/* sr_status_flags */
4939	nfserr = nfsd4_encode_uint32_t(xdr, val: seq->status_flags);
4940	if (nfserr != nfs_ok)
4941	return nfserr;
4942
4943	resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4944	return nfs_ok;
4945	}
4946
4947	static __be32
4948	nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4949	union nfsd4_op_u *u)
4950	{
4951	struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
4952	struct nfsd4_test_stateid_id *stateid, *next;
4953	struct xdr_stream *xdr = resp->xdr;
4954
4955	/* tsr_status_codes<> */
4956	if (xdr_stream_encode_u32(xdr, n: test_stateid->ts_num_ids) != XDR_UNIT)
4957	return nfserr_resource;
4958	list_for_each_entry_safe(stateid, next,
4959	&test_stateid->ts_stateid_list, ts_id_list) {
4960	if (xdr_stream_encode_be32(xdr, n: stateid->ts_id_status) != XDR_UNIT)
4961	return nfserr_resource;
4962	}
4963	return nfs_ok;
4964	}
4965
4966	#ifdef CONFIG_NFSD_PNFS
4967	static __be32
4968	nfsd4_encode_device_addr4(struct xdr_stream *xdr,
4969	const struct nfsd4_getdeviceinfo *gdev)
4970	{
4971	u32 needed_len, starting_len = xdr->buf->len;
4972	const struct nfsd4_layout_ops *ops;
4973	__be32 status;
4974
4975	/* da_layout_type */
4976	if (xdr_stream_encode_u32(xdr, n: gdev->gd_layout_type) != XDR_UNIT)
4977	return nfserr_resource;
4978	/* da_addr_body */
4979	ops = nfsd4_layout_ops[gdev->gd_layout_type];
4980	status = ops->encode_getdeviceinfo(xdr, gdev);
4981	if (status != nfs_ok) {
4982	/*
4983	* Don't burden the layout drivers with enforcing
4984	* gd_maxcount. Just tell the client to come back
4985	* with a bigger buffer if it's not enough.
4986	*/
4987	if (xdr->buf->len + XDR_UNIT > gdev->gd_maxcount)
4988	goto toosmall;
4989	return status;
4990	}
4991
4992	return nfs_ok;
4993
4994	toosmall:
4995	needed_len = xdr->buf->len + XDR_UNIT; /* notifications */
4996	xdr_truncate_encode(xdr, len: starting_len);
4997
4998	status = nfsd4_encode_count4(xdr, needed_len);
4999	if (status != nfs_ok)
5000	return status;
5001	return nfserr_toosmall;
5002	}
5003
5004	static __be32
5005	nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
5006	union nfsd4_op_u *u)
5007	{
5008	struct nfsd4_getdeviceinfo *gdev = &u->getdeviceinfo;
5009	struct xdr_stream *xdr = resp->xdr;
5010
5011	/* gdir_device_addr */
5012	nfserr = nfsd4_encode_device_addr4(xdr, gdev);
5013	if (nfserr)
5014	return nfserr;
5015	/* gdir_notification */
5016	return nfsd4_encode_bitmap4(xdr, bmval0: gdev->gd_notify_types, bmval1: 0, bmval2: 0);
5017	}
5018
5019	static __be32
5020	nfsd4_encode_layout4(struct xdr_stream *xdr, const struct nfsd4_layoutget *lgp)
5021	{
5022	const struct nfsd4_layout_ops *ops = nfsd4_layout_ops[lgp->lg_layout_type];
5023	__be32 status;
5024
5025	/* lo_offset */
5026	status = nfsd4_encode_offset4(xdr, lgp->lg_seg.offset);
5027	if (status != nfs_ok)
5028	return status;
5029	/* lo_length */
5030	status = nfsd4_encode_length4(xdr, lgp->lg_seg.length);
5031	if (status != nfs_ok)
5032	return status;
5033	/* lo_iomode */
5034	if (xdr_stream_encode_u32(xdr, n: lgp->lg_seg.iomode) != XDR_UNIT)
5035	return nfserr_resource;
5036	/* lo_content */
5037	if (xdr_stream_encode_u32(xdr, n: lgp->lg_layout_type) != XDR_UNIT)
5038	return nfserr_resource;
5039	return ops->encode_layoutget(xdr, lgp);
5040	}
5041
5042	static __be32
5043	nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
5044	union nfsd4_op_u *u)
5045	{
5046	struct nfsd4_layoutget *lgp = &u->layoutget;
5047	struct xdr_stream *xdr = resp->xdr;
5048
5049	/* logr_return_on_close */
5050	nfserr = nfsd4_encode_bool(xdr, val: true);
5051	if (nfserr != nfs_ok)
5052	return nfserr;
5053	/* logr_stateid */
5054	nfserr = nfsd4_encode_stateid4(xdr, sid: &lgp->lg_sid);
5055	if (nfserr != nfs_ok)
5056	return nfserr;
5057	/* logr_layout<> */
5058	if (xdr_stream_encode_u32(xdr, n: 1) != XDR_UNIT)
5059	return nfserr_resource;
5060	return nfsd4_encode_layout4(xdr, lgp);
5061	}
5062
5063	static __be32
5064	nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
5065	union nfsd4_op_u *u)
5066	{
5067	struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
5068	struct xdr_stream *xdr = resp->xdr;
5069
5070	/* ns_sizechanged */
5071	nfserr = nfsd4_encode_bool(xdr, val: lcp->lc_size_chg);
5072	if (nfserr != nfs_ok)
5073	return nfserr;
5074	if (lcp->lc_size_chg)
5075	/* ns_size */
5076	return nfsd4_encode_length4(xdr, lcp->lc_newsize);
5077	return nfs_ok;
5078	}
5079
5080	static __be32
5081	nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
5082	union nfsd4_op_u *u)
5083	{
5084	struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
5085	struct xdr_stream *xdr = resp->xdr;
5086
5087	/* lrs_present */
5088	nfserr = nfsd4_encode_bool(xdr, val: lrp->lrs_present);
5089	if (nfserr != nfs_ok)
5090	return nfserr;
5091	if (lrp->lrs_present)
5092	/* lrs_stateid */
5093	return nfsd4_encode_stateid4(xdr, sid: &lrp->lr_sid);
5094	return nfs_ok;
5095	}
5096	#endif /* CONFIG_NFSD_PNFS */
5097
5098	static __be32
5099	nfsd4_encode_write_response4(struct xdr_stream *xdr,
5100	const struct nfsd4_copy *copy)
5101	{
5102	const struct nfsd42_write_res *write = &copy->cp_res;
5103	u32 count = nfsd4_copy_is_sync(copy) ? 0 : 1;
5104	__be32 status;
5105
5106	/* wr_callback_id<1> */
5107	if (xdr_stream_encode_u32(xdr, n: count) != XDR_UNIT)
5108	return nfserr_resource;
5109	if (count) {
5110	status = nfsd4_encode_stateid4(xdr, sid: &write->cb_stateid);
5111	if (status != nfs_ok)
5112	return status;
5113	}
5114
5115	/* wr_count */
5116	status = nfsd4_encode_length4(xdr, write->wr_bytes_written);
5117	if (status != nfs_ok)
5118	return status;
5119	/* wr_committed */
5120	if (xdr_stream_encode_u32(xdr, n: write->wr_stable_how) != XDR_UNIT)
5121	return nfserr_resource;
5122	/* wr_writeverf */
5123	return nfsd4_encode_verifier4(xdr, verf: &write->wr_verifier);
5124	}
5125
5126	static __be32 nfsd4_encode_copy_requirements4(struct xdr_stream *xdr,
5127	const struct nfsd4_copy *copy)
5128	{
5129	__be32 status;
5130
5131	/* cr_consecutive */
5132	status = nfsd4_encode_bool(xdr, val: true);
5133	if (status != nfs_ok)
5134	return status;
5135	/* cr_synchronous */
5136	return nfsd4_encode_bool(xdr, val: nfsd4_copy_is_sync(copy));
5137	}
5138
5139	static __be32
5140	nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
5141	union nfsd4_op_u *u)
5142	{
5143	struct nfsd4_copy *copy = &u->copy;
5144
5145	nfserr = nfsd4_encode_write_response4(xdr: resp->xdr, copy);
5146	if (nfserr != nfs_ok)
5147	return nfserr;
5148	return nfsd4_encode_copy_requirements4(xdr: resp->xdr, copy);
5149	}
5150
5151	static __be32
5152	nfsd4_encode_netloc4(struct xdr_stream *xdr, const struct nl4_server *ns)
5153	{
5154	__be32 status;
5155
5156	if (xdr_stream_encode_u32(xdr, n: ns->nl4_type) != XDR_UNIT)
5157	return nfserr_resource;
5158	switch (ns->nl4_type) {
5159	case NL4_NETADDR:
5160	/* nl_addr */
5161	status = nfsd4_encode_netaddr4(xdr, addr: &ns->u.nl4_addr);
5162	break;
5163	default:
5164	status = nfserr_serverfault;
5165	}
5166	return status;
5167	}
5168
5169	static __be32
5170	nfsd4_encode_copy_notify(struct nfsd4_compoundres *resp, __be32 nfserr,
5171	union nfsd4_op_u *u)
5172	{
5173	struct nfsd4_copy_notify *cn = &u->copy_notify;
5174	struct xdr_stream *xdr = resp->xdr;
5175
5176	/* cnr_lease_time */
5177	nfserr = nfsd4_encode_nfstime4(xdr, tv: &cn->cpn_lease_time);
5178	if (nfserr)
5179	return nfserr;
5180	/* cnr_stateid */
5181	nfserr = nfsd4_encode_stateid4(xdr, sid: &cn->cpn_cnr_stateid);
5182	if (nfserr)
5183	return nfserr;
5184	/* cnr_source_server<> */
5185	if (xdr_stream_encode_u32(xdr, n: 1) != XDR_UNIT)
5186	return nfserr_resource;
5187	return nfsd4_encode_netloc4(xdr, ns: cn->cpn_src);
5188	}
5189
5190	static __be32
5191	nfsd4_encode_offload_status(struct nfsd4_compoundres *resp, __be32 nfserr,
5192	union nfsd4_op_u *u)
5193	{
5194	struct nfsd4_offload_status *os = &u->offload_status;
5195	struct xdr_stream *xdr = resp->xdr;
5196
5197	/* osr_count */
5198	nfserr = nfsd4_encode_length4(xdr, os->count);
5199	if (nfserr != nfs_ok)
5200	return nfserr;
5201	/* osr_complete<1> */
5202	if (xdr_stream_encode_u32(xdr, n: 0) != XDR_UNIT)
5203	return nfserr_resource;
5204	return nfs_ok;
5205	}
5206
5207	static __be32
5208	nfsd4_encode_read_plus_data(struct nfsd4_compoundres *resp,
5209	struct nfsd4_read *read)
5210	{
5211	struct nfsd4_compoundargs *argp = resp->rqstp->rq_argp;
5212	struct file *file = read->rd_nf->nf_file;
5213	struct xdr_stream *xdr = resp->xdr;
5214	bool splice_ok = argp->splice_ok;
5215	unsigned long maxcount;
5216	__be32 nfserr, *p;
5217
5218	/* Content type, offset, byte count */
5219	p = xdr_reserve_space(xdr, nbytes: 4 + 8 + 4);
5220	if (!p)
5221	return nfserr_io;
5222	if (resp->xdr->buf->page_len && splice_ok) {
5223	WARN_ON_ONCE(splice_ok);
5224	return nfserr_serverfault;
5225	}
5226
5227	maxcount = min_t(unsigned long, read->rd_length,
5228	(xdr->buf->buflen - xdr->buf->len));
5229
5230	if (file->f_op->splice_read && splice_ok)
5231	nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
5232	else
5233	nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
5234	if (nfserr)
5235	return nfserr;
5236
5237	*p++ = cpu_to_be32(NFS4_CONTENT_DATA);
5238	p = xdr_encode_hyper(p, val: read->rd_offset);
5239	*p = cpu_to_be32(read->rd_length);
5240
5241	return nfs_ok;
5242	}
5243
5244	static __be32
5245	nfsd4_encode_read_plus(struct nfsd4_compoundres *resp, __be32 nfserr,
5246	union nfsd4_op_u *u)
5247	{
5248	struct nfsd4_read *read = &u->read;
5249	struct file *file = read->rd_nf->nf_file;
5250	struct xdr_stream *xdr = resp->xdr;
5251	int starting_len = xdr->buf->len;
5252	u32 segments = 0;
5253	__be32 *p;
5254
5255	if (nfserr)
5256	return nfserr;
5257
5258	/* eof flag, segment count */
5259	p = xdr_reserve_space(xdr, nbytes: 4 + 4);
5260	if (!p)
5261	return nfserr_io;
5262	xdr_commit_encode(xdr);
5263
5264	read->rd_eof = read->rd_offset >= i_size_read(inode: file_inode(f: file));
5265	if (read->rd_eof)
5266	goto out;
5267
5268	nfserr = nfsd4_encode_read_plus_data(resp, read);
5269	if (nfserr) {
5270	xdr_truncate_encode(xdr, len: starting_len);
5271	return nfserr;
5272	}
5273
5274	segments++;
5275
5276	out:
5277	p = xdr_encode_bool(p, n: read->rd_eof);
5278	*p = cpu_to_be32(segments);
5279	return nfserr;
5280	}
5281
5282	static __be32
5283	nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
5284	union nfsd4_op_u *u)
5285	{
5286	struct nfsd4_seek *seek = &u->seek;
5287	struct xdr_stream *xdr = resp->xdr;
5288
5289	/* sr_eof */
5290	nfserr = nfsd4_encode_bool(xdr, val: seek->seek_eof);
5291	if (nfserr != nfs_ok)
5292	return nfserr;
5293	/* sr_offset */
5294	return nfsd4_encode_offset4(xdr, seek->seek_pos);
5295	}
5296
5297	static __be32
5298	nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr,
5299	union nfsd4_op_u *p)
5300	{
5301	return nfserr;
5302	}
5303
5304	/*
5305	* Encode kmalloc-ed buffer in to XDR stream.
5306	*/
5307	static __be32
5308	nfsd4_vbuf_to_stream(struct xdr_stream *xdr, char *buf, u32 buflen)
5309	{
5310	u32 cplen;
5311	__be32 *p;
5312
5313	cplen = min_t(unsigned long, buflen,
5314	((void *)xdr->end - (void *)xdr->p));
5315	p = xdr_reserve_space(xdr, nbytes: cplen);
5316	if (!p)
5317	return nfserr_resource;
5318
5319	memcpy(p, buf, cplen);
5320	buf += cplen;
5321	buflen -= cplen;
5322
5323	while (buflen) {
5324	cplen = min_t(u32, buflen, PAGE_SIZE);
5325	p = xdr_reserve_space(xdr, nbytes: cplen);
5326	if (!p)
5327	return nfserr_resource;
5328
5329	memcpy(p, buf, cplen);
5330
5331	if (cplen < PAGE_SIZE) {
5332	/*
5333	* We're done, with a length that wasn't page
5334	* aligned, so possibly not word aligned. Pad
5335	* any trailing bytes with 0.
5336	*/
5337	xdr_encode_opaque_fixed(p, NULL, len: cplen);
5338	break;
5339	}
5340
5341	buflen -= PAGE_SIZE;
5342	buf += PAGE_SIZE;
5343	}
5344
5345	return 0;
5346	}
5347
5348	static __be32
5349	nfsd4_encode_getxattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5350	union nfsd4_op_u *u)
5351	{
5352	struct nfsd4_getxattr *getxattr = &u->getxattr;
5353	struct xdr_stream *xdr = resp->xdr;
5354	__be32 *p, err;
5355
5356	p = xdr_reserve_space(xdr, nbytes: 4);
5357	if (!p)
5358	return nfserr_resource;
5359
5360	*p = cpu_to_be32(getxattr->getxa_len);
5361
5362	if (getxattr->getxa_len == 0)
5363	return 0;
5364
5365	err = nfsd4_vbuf_to_stream(xdr, buf: getxattr->getxa_buf,
5366	buflen: getxattr->getxa_len);
5367
5368	kvfree(addr: getxattr->getxa_buf);
5369
5370	return err;
5371	}
5372
5373	static __be32
5374	nfsd4_encode_setxattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5375	union nfsd4_op_u *u)
5376	{
5377	struct nfsd4_setxattr *setxattr = &u->setxattr;
5378	struct xdr_stream *xdr = resp->xdr;
5379
5380	return nfsd4_encode_change_info4(xdr, c: &setxattr->setxa_cinfo);
5381	}
5382
5383	/*
5384	* See if there are cookie values that can be rejected outright.
5385	*/
5386	static __be32
5387	nfsd4_listxattr_validate_cookie(struct nfsd4_listxattrs *listxattrs,
5388	u32 *offsetp)
5389	{
5390	u64 cookie = listxattrs->lsxa_cookie;
5391
5392	/*
5393	* If the cookie is larger than the maximum number we can fit
5394	* in the buffer we just got back from vfs_listxattr, it's invalid.
5395	*/
5396	if (cookie > (listxattrs->lsxa_len) / (XATTR_USER_PREFIX_LEN + 2))
5397	return nfserr_badcookie;
5398
5399	*offsetp = (u32)cookie;
5400	return 0;
5401	}
5402
5403	static __be32
5404	nfsd4_encode_listxattrs(struct nfsd4_compoundres *resp, __be32 nfserr,
5405	union nfsd4_op_u *u)
5406	{
5407	struct nfsd4_listxattrs *listxattrs = &u->listxattrs;
5408	struct xdr_stream *xdr = resp->xdr;
5409	u32 cookie_offset, count_offset, eof;
5410	u32 left, xdrleft, slen, count;
5411	u32 xdrlen, offset;
5412	u64 cookie;
5413	char *sp;
5414	__be32 status, tmp;
5415	__be64 wire_cookie;
5416	__be32 *p;
5417	u32 nuser;
5418
5419	eof = 1;
5420
5421	status = nfsd4_listxattr_validate_cookie(listxattrs, offsetp: &offset);
5422	if (status)
5423	goto out;
5424
5425	/*
5426	* Reserve space for the cookie and the name array count. Record
5427	* the offsets to save them later.
5428	*/
5429	cookie_offset = xdr->buf->len;
5430	count_offset = cookie_offset + 8;
5431	p = xdr_reserve_space(xdr, XDR_UNIT * 3);
5432	if (!p) {
5433	status = nfserr_resource;
5434	goto out;
5435	}
5436
5437	count = 0;
5438	left = listxattrs->lsxa_len;
5439	sp = listxattrs->lsxa_buf;
5440	nuser = 0;
5441
5442	/* Bytes left is maxcount - 8 (cookie) - 4 (array count) */
5443	xdrleft = listxattrs->lsxa_maxcount - XDR_UNIT * 3;
5444
5445	while (left > 0 && xdrleft > 0) {
5446	slen = strlen(sp);
5447
5448	/*
5449	* Check if this is a "user." attribute, skip it if not.
5450	*/
5451	if (strncmp(sp, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN))
5452	goto contloop;
5453
5454	slen -= XATTR_USER_PREFIX_LEN;
5455	xdrlen = 4 + ((slen + 3) & ~3);
5456	/* Check if both entry and eof can fit in the XDR buffer */
5457	if (xdrlen + XDR_UNIT > xdrleft) {
5458	if (count == 0) {
5459	/*
5460	* Can't even fit the first attribute name.
5461	*/
5462	status = nfserr_toosmall;
5463	goto out;
5464	}
5465	eof = 0;
5466	goto wreof;
5467	}
5468
5469	left -= XATTR_USER_PREFIX_LEN;
5470	sp += XATTR_USER_PREFIX_LEN;
5471	if (nuser++ < offset)
5472	goto contloop;
5473
5474
5475	p = xdr_reserve_space(xdr, nbytes: xdrlen);
5476	if (!p) {
5477	status = nfserr_resource;
5478	goto out;
5479	}
5480
5481	xdr_encode_opaque(p, ptr: sp, len: slen);
5482
5483	xdrleft -= xdrlen;
5484	count++;
5485	contloop:
5486	sp += slen + 1;
5487	left -= slen + 1;
5488	}
5489
5490	/*
5491	* If there were user attributes to copy, but we didn't copy
5492	* any, the offset was too large (e.g. the cookie was invalid).
5493	*/
5494	if (nuser > 0 && count == 0) {
5495	status = nfserr_badcookie;
5496	goto out;
5497	}
5498
5499	wreof:
5500	p = xdr_reserve_space(xdr, nbytes: 4);
5501	if (!p) {
5502	status = nfserr_resource;
5503	goto out;
5504	}
5505	*p = cpu_to_be32(eof);
5506
5507	cookie = offset + count;
5508
5509	wire_cookie = cpu_to_be64(cookie);
5510	write_bytes_to_xdr_buf(xdr->buf, cookie_offset, &wire_cookie, 8);
5511	tmp = cpu_to_be32(count);
5512	write_bytes_to_xdr_buf(xdr->buf, count_offset, &tmp, 4);
5513	out:
5514	if (listxattrs->lsxa_len)
5515	kvfree(addr: listxattrs->lsxa_buf);
5516	return status;
5517	}
5518
5519	static __be32
5520	nfsd4_encode_removexattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5521	union nfsd4_op_u *u)
5522	{
5523	struct nfsd4_removexattr *removexattr = &u->removexattr;
5524	struct xdr_stream *xdr = resp->xdr;
5525
5526	return nfsd4_encode_change_info4(xdr, c: &removexattr->rmxa_cinfo);
5527	}
5528
5529	typedef __be32(*nfsd4_enc)(struct nfsd4_compoundres *, __be32, union nfsd4_op_u *u);
5530
5531	/*
5532	* Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
5533	* since we don't need to filter out obsolete ops as this is
5534	* done in the decoding phase.
5535	*/
5536	static const nfsd4_enc nfsd4_enc_ops[] = {
5537	[OP_ACCESS] = nfsd4_encode_access,
5538	[OP_CLOSE] = nfsd4_encode_close,
5539	[OP_COMMIT] = nfsd4_encode_commit,
5540	[OP_CREATE] = nfsd4_encode_create,
5541	[OP_DELEGPURGE] = nfsd4_encode_noop,
5542	[OP_DELEGRETURN] = nfsd4_encode_noop,
5543	[OP_GETATTR] = nfsd4_encode_getattr,
5544	[OP_GETFH] = nfsd4_encode_getfh,
5545	[OP_LINK] = nfsd4_encode_link,
5546	[OP_LOCK] = nfsd4_encode_lock,
5547	[OP_LOCKT] = nfsd4_encode_lockt,
5548	[OP_LOCKU] = nfsd4_encode_locku,
5549	[OP_LOOKUP] = nfsd4_encode_noop,
5550	[OP_LOOKUPP] = nfsd4_encode_noop,
5551	[OP_NVERIFY] = nfsd4_encode_noop,
5552	[OP_OPEN] = nfsd4_encode_open,
5553	[OP_OPENATTR] = nfsd4_encode_noop,
5554	[OP_OPEN_CONFIRM] = nfsd4_encode_open_confirm,
5555	[OP_OPEN_DOWNGRADE] = nfsd4_encode_open_downgrade,
5556	[OP_PUTFH] = nfsd4_encode_noop,
5557	[OP_PUTPUBFH] = nfsd4_encode_noop,
5558	[OP_PUTROOTFH] = nfsd4_encode_noop,
5559	[OP_READ] = nfsd4_encode_read,
5560	[OP_READDIR] = nfsd4_encode_readdir,
5561	[OP_READLINK] = nfsd4_encode_readlink,
5562	[OP_REMOVE] = nfsd4_encode_remove,
5563	[OP_RENAME] = nfsd4_encode_rename,
5564	[OP_RENEW] = nfsd4_encode_noop,
5565	[OP_RESTOREFH] = nfsd4_encode_noop,
5566	[OP_SAVEFH] = nfsd4_encode_noop,
5567	[OP_SECINFO] = nfsd4_encode_secinfo,
5568	[OP_SETATTR] = nfsd4_encode_setattr,
5569	[OP_SETCLIENTID] = nfsd4_encode_setclientid,
5570	[OP_SETCLIENTID_CONFIRM] = nfsd4_encode_noop,
5571	[OP_VERIFY] = nfsd4_encode_noop,
5572	[OP_WRITE] = nfsd4_encode_write,
5573	[OP_RELEASE_LOCKOWNER] = nfsd4_encode_noop,
5574
5575	/* NFSv4.1 operations */
5576	[OP_BACKCHANNEL_CTL] = nfsd4_encode_noop,
5577	[OP_BIND_CONN_TO_SESSION] = nfsd4_encode_bind_conn_to_session,
5578	[OP_EXCHANGE_ID] = nfsd4_encode_exchange_id,
5579	[OP_CREATE_SESSION] = nfsd4_encode_create_session,
5580	[OP_DESTROY_SESSION] = nfsd4_encode_noop,
5581	[OP_FREE_STATEID] = nfsd4_encode_noop,
5582	[OP_GET_DIR_DELEGATION] = nfsd4_encode_noop,
5583	#ifdef CONFIG_NFSD_PNFS
5584	[OP_GETDEVICEINFO] = nfsd4_encode_getdeviceinfo,
5585	[OP_GETDEVICELIST] = nfsd4_encode_noop,
5586	[OP_LAYOUTCOMMIT] = nfsd4_encode_layoutcommit,
5587	[OP_LAYOUTGET] = nfsd4_encode_layoutget,
5588	[OP_LAYOUTRETURN] = nfsd4_encode_layoutreturn,
5589	#else
5590	[OP_GETDEVICEINFO] = nfsd4_encode_noop,
5591	[OP_GETDEVICELIST] = nfsd4_encode_noop,
5592	[OP_LAYOUTCOMMIT] = nfsd4_encode_noop,
5593	[OP_LAYOUTGET] = nfsd4_encode_noop,
5594	[OP_LAYOUTRETURN] = nfsd4_encode_noop,
5595	#endif
5596	[OP_SECINFO_NO_NAME] = nfsd4_encode_secinfo_no_name,
5597	[OP_SEQUENCE] = nfsd4_encode_sequence,
5598	[OP_SET_SSV] = nfsd4_encode_noop,
5599	[OP_TEST_STATEID] = nfsd4_encode_test_stateid,
5600	[OP_WANT_DELEGATION] = nfsd4_encode_noop,
5601	[OP_DESTROY_CLIENTID] = nfsd4_encode_noop,
5602	[OP_RECLAIM_COMPLETE] = nfsd4_encode_noop,
5603
5604	/* NFSv4.2 operations */
5605	[OP_ALLOCATE] = nfsd4_encode_noop,
5606	[OP_COPY] = nfsd4_encode_copy,
5607	[OP_COPY_NOTIFY] = nfsd4_encode_copy_notify,
5608	[OP_DEALLOCATE] = nfsd4_encode_noop,
5609	[OP_IO_ADVISE] = nfsd4_encode_noop,
5610	[OP_LAYOUTERROR] = nfsd4_encode_noop,
5611	[OP_LAYOUTSTATS] = nfsd4_encode_noop,
5612	[OP_OFFLOAD_CANCEL] = nfsd4_encode_noop,
5613	[OP_OFFLOAD_STATUS] = nfsd4_encode_offload_status,
5614	[OP_READ_PLUS] = nfsd4_encode_read_plus,
5615	[OP_SEEK] = nfsd4_encode_seek,
5616	[OP_WRITE_SAME] = nfsd4_encode_noop,
5617	[OP_CLONE] = nfsd4_encode_noop,
5618
5619	/* RFC 8276 extended atributes operations */
5620	[OP_GETXATTR] = nfsd4_encode_getxattr,
5621	[OP_SETXATTR] = nfsd4_encode_setxattr,
5622	[OP_LISTXATTRS] = nfsd4_encode_listxattrs,
5623	[OP_REMOVEXATTR] = nfsd4_encode_removexattr,
5624	};
5625
5626	/*
5627	* Calculate whether we still have space to encode repsize bytes.
5628	* There are two considerations:
5629	* - For NFS versions >=4.1, the size of the reply must stay within
5630	* session limits
5631	* - For all NFS versions, we must stay within limited preallocated
5632	* buffer space.
5633	*
5634	* This is called before the operation is processed, so can only provide
5635	* an upper estimate. For some nonidempotent operations (such as
5636	* getattr), it's not necessarily a problem if that estimate is wrong,
5637	* as we can fail it after processing without significant side effects.
5638	*/
5639	__be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
5640	{
5641	struct xdr_buf *buf = &resp->rqstp->rq_res;
5642	struct nfsd4_slot *slot = resp->cstate.slot;
5643
5644	if (buf->len + respsize <= buf->buflen)
5645	return nfs_ok;
5646	if (!nfsd4_has_session(cs: &resp->cstate))
5647	return nfserr_resource;
5648	if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
5649	WARN_ON_ONCE(1);
5650	return nfserr_rep_too_big_to_cache;
5651	}
5652	return nfserr_rep_too_big;
5653	}
5654
5655	void
5656	nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
5657	{
5658	struct xdr_stream *xdr = resp->xdr;
5659	struct nfs4_stateowner *so = resp->cstate.replay_owner;
5660	struct svc_rqst *rqstp = resp->rqstp;
5661	const struct nfsd4_operation *opdesc = op->opdesc;
5662	int post_err_offset;
5663	nfsd4_enc encoder;
5664	__be32 *p;
5665
5666	p = xdr_reserve_space(xdr, nbytes: 8);
5667	if (!p)
5668	goto release;
5669	*p++ = cpu_to_be32(op->opnum);
5670	post_err_offset = xdr->buf->len;
5671
5672	if (op->opnum == OP_ILLEGAL)
5673	goto status;
5674	if (op->status && opdesc &&
5675	!(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE))
5676	goto status;
5677	BUG_ON(op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
5678	!nfsd4_enc_ops[op->opnum]);
5679	encoder = nfsd4_enc_ops[op->opnum];
5680	op->status = encoder(resp, op->status, &op->u);
5681	if (op->status)
5682	trace_nfsd_compound_encode_err(rqstp, opnum: op->opnum, status: op->status);
5683	xdr_commit_encode(xdr);
5684
5685	/* nfsd4_check_resp_size guarantees enough room for error status */
5686	if (!op->status) {
5687	int space_needed = 0;
5688	if (!nfsd4_last_compound_op(rqstp))
5689	space_needed = COMPOUND_ERR_SLACK_SPACE;
5690	op->status = nfsd4_check_resp_size(resp, respsize: space_needed);
5691	}
5692	if (op->status == nfserr_resource && nfsd4_has_session(cs: &resp->cstate)) {
5693	struct nfsd4_slot *slot = resp->cstate.slot;
5694
5695	if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
5696	op->status = nfserr_rep_too_big_to_cache;
5697	else
5698	op->status = nfserr_rep_too_big;
5699	}
5700	if (op->status == nfserr_resource ||
5701	op->status == nfserr_rep_too_big ||
5702	op->status == nfserr_rep_too_big_to_cache) {
5703	/*
5704	* The operation may have already been encoded or
5705	* partially encoded. No op returns anything additional
5706	* in the case of one of these three errors, so we can
5707	* just truncate back to after the status. But it's a
5708	* bug if we had to do this on a non-idempotent op:
5709	*/
5710	warn_on_nonidempotent_op(op);
5711	xdr_truncate_encode(xdr, len: post_err_offset);
5712	}
5713	if (so) {
5714	int len = xdr->buf->len - post_err_offset;
5715
5716	so->so_replay.rp_status = op->status;
5717	so->so_replay.rp_buflen = len;
5718	read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
5719	so->so_replay.rp_buf, len);
5720	}
5721	status:
5722	*p = op->status;
5723	release:
5724	if (opdesc && opdesc->op_release)
5725	opdesc->op_release(&op->u);
5726
5727	/*
5728	* Account for pages consumed while encoding this operation.
5729	* The xdr_stream primitives don't manage rq_next_page.
5730	*/
5731	rqstp->rq_next_page = xdr->page_ptr + 1;
5732	}
5733
5734	/**
5735	* nfsd4_encode_replay - encode a result stored in the stateowner reply cache
5736	* @xdr: send buffer's XDR stream
5737	* @op: operation being replayed
5738	*
5739	* @op->replay->rp_buf contains the previously-sent already-encoded result.
5740	*/
5741	void nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
5742	{
5743	struct nfs4_replay *rp = op->replay;
5744
5745	trace_nfsd_stateowner_replay(opnum: op->opnum, rp);
5746
5747	if (xdr_stream_encode_u32(xdr, n: op->opnum) != XDR_UNIT)
5748	return;
5749	if (xdr_stream_encode_be32(xdr, n: rp->rp_status) != XDR_UNIT)
5750	return;
5751	xdr_stream_encode_opaque_fixed(xdr, ptr: rp->rp_buf, len: rp->rp_buflen);
5752	}
5753
5754	void nfsd4_release_compoundargs(struct svc_rqst *rqstp)
5755	{
5756	struct nfsd4_compoundargs *args = rqstp->rq_argp;
5757
5758	if (args->ops != args->iops) {
5759	vfree(addr: args->ops);
5760	args->ops = args->iops;
5761	}
5762	while (args->to_free) {
5763	struct svcxdr_tmpbuf *tb = args->to_free;
5764	args->to_free = tb->next;
5765	kfree(objp: tb);
5766	}
5767	}
5768
5769	bool
5770	nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
5771	{
5772	struct nfsd4_compoundargs *args = rqstp->rq_argp;
5773
5774	/* svcxdr_tmp_alloc */
5775	args->to_free = NULL;
5776
5777	args->xdr = xdr;
5778	args->ops = args->iops;
5779	args->rqstp = rqstp;
5780
5781	return nfsd4_decode_compound(argp: args);
5782	}
5783
5784	bool
5785	nfs4svc_encode_compoundres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
5786	{
5787	struct nfsd4_compoundres *resp = rqstp->rq_resp;
5788	__be32 *p;
5789
5790	/*
5791	* Send buffer space for the following items is reserved
5792	* at the top of nfsd4_proc_compound().
5793	*/
5794	p = resp->statusp;
5795
5796	*p++ = resp->cstate.status;
5797	*p++ = htonl(resp->taglen);
5798	memcpy(p, resp->tag, resp->taglen);
5799	p += XDR_QUADLEN(resp->taglen);
5800	*p++ = htonl(resp->opcnt);
5801
5802	nfsd4_sequence_done(resp);
5803	return true;
5804	}
5805