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	if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
2528	clear_bit(nr: RQ_SPLICE_OK, addr: &argp->rqstp->rq_flags);
2529
2530	return true;
2531	}
2532
2533	static __be32 nfsd4_encode_nfs_fh4(struct xdr_stream *xdr,
2534	struct knfsd_fh *fh_handle)
2535	{
2536	return nfsd4_encode_opaque(xdr, data: fh_handle->fh_raw, size: fh_handle->fh_size);
2537	}
2538
2539	/* This is a frequently-encoded type; open-coded for speed */
2540	static __be32 nfsd4_encode_nfstime4(struct xdr_stream *xdr,
2541	const struct timespec64 *tv)
2542	{
2543	__be32 *p;
2544
2545	p = xdr_reserve_space(xdr, XDR_UNIT * 3);
2546	if (!p)
2547	return nfserr_resource;
2548	p = xdr_encode_hyper(p, val: tv->tv_sec);
2549	*p = cpu_to_be32(tv->tv_nsec);
2550	return nfs_ok;
2551	}
2552
2553	static __be32 nfsd4_encode_specdata4(struct xdr_stream *xdr,
2554	unsigned int major, unsigned int minor)
2555	{
2556	__be32 status;
2557
2558	status = nfsd4_encode_uint32_t(xdr, val: major);
2559	if (status != nfs_ok)
2560	return status;
2561	return nfsd4_encode_uint32_t(xdr, val: minor);
2562	}
2563
2564	static __be32
2565	nfsd4_encode_change_info4(struct xdr_stream *xdr, const struct nfsd4_change_info *c)
2566	{
2567	__be32 status;
2568
2569	status = nfsd4_encode_bool(xdr, val: c->atomic);
2570	if (status != nfs_ok)
2571	return status;
2572	status = nfsd4_encode_changeid4(xdr, c->before_change);
2573	if (status != nfs_ok)
2574	return status;
2575	return nfsd4_encode_changeid4(xdr, c->after_change);
2576	}
2577
2578	static __be32 nfsd4_encode_netaddr4(struct xdr_stream *xdr,
2579	const struct nfs42_netaddr *addr)
2580	{
2581	__be32 status;
2582
2583	/* na_r_netid */
2584	status = nfsd4_encode_opaque(xdr, data: addr->netid, size: addr->netid_len);
2585	if (status != nfs_ok)
2586	return status;
2587	/* na_r_addr */
2588	return nfsd4_encode_opaque(xdr, data: addr->addr, size: addr->addr_len);
2589	}
2590
2591	/* Encode as an array of strings the string given with components
2592	* separated @sep, escaped with esc_enter and esc_exit.
2593	*/
2594	static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
2595	char *components, char esc_enter,
2596	char esc_exit)
2597	{
2598	__be32 *p;
2599	__be32 pathlen;
2600	int pathlen_offset;
2601	int strlen, count=0;
2602	char *str, *end, *next;
2603
2604	dprintk("nfsd4_encode_components(%s)\n", components);
2605
2606	pathlen_offset = xdr->buf->len;
2607	p = xdr_reserve_space(xdr, nbytes: 4);
2608	if (!p)
2609	return nfserr_resource;
2610	p++; /* We will fill this in with @count later */
2611
2612	end = str = components;
2613	while (*end) {
2614	bool found_esc = false;
2615
2616	/* try to parse as esc_start, ..., esc_end, sep */
2617	if (*str == esc_enter) {
2618	for (; *end && (*end != esc_exit); end++)
2619	/* find esc_exit or end of string */;
2620	next = end + 1;
2621	if (*end && (!*next || *next == sep)) {
2622	str++;
2623	found_esc = true;
2624	}
2625	}
2626
2627	if (!found_esc)
2628	for (; *end && (*end != sep); end++)
2629	/* find sep or end of string */;
2630
2631	strlen = end - str;
2632	if (strlen) {
2633	p = xdr_reserve_space(xdr, nbytes: strlen + 4);
2634	if (!p)
2635	return nfserr_resource;
2636	p = xdr_encode_opaque(p, ptr: str, len: strlen);
2637	count++;
2638	}
2639	else
2640	end++;
2641	if (found_esc)
2642	end = next;
2643
2644	str = end;
2645	}
2646	pathlen = htonl(count);
2647	write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2648	return 0;
2649	}
2650
2651	/* Encode as an array of strings the string given with components
2652	* separated @sep.
2653	*/
2654	static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2655	char *components)
2656	{
2657	return nfsd4_encode_components_esc(xdr, sep, components, esc_enter: 0, esc_exit: 0);
2658	}
2659
2660	static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2661	struct nfsd4_fs_location *location)
2662	{
2663	__be32 status;
2664
2665	status = nfsd4_encode_components_esc(xdr, sep: ':', components: location->hosts,
2666	esc_enter: '[', esc_exit: ']');
2667	if (status)
2668	return status;
2669	status = nfsd4_encode_components(xdr, sep: '/', components: location->path);
2670	if (status)
2671	return status;
2672	return nfs_ok;
2673	}
2674
2675	static __be32 nfsd4_encode_pathname4(struct xdr_stream *xdr,
2676	const struct path *root,
2677	const struct path *path)
2678	{
2679	struct path cur = *path;
2680	__be32 *p;
2681	struct dentry **components = NULL;
2682	unsigned int ncomponents = 0;
2683	__be32 err = nfserr_jukebox;
2684
2685	dprintk("nfsd4_encode_components(");
2686
2687	path_get(&cur);
2688	/* First walk the path up to the nfsd root, and store the
2689	* dentries/path components in an array.
2690	*/
2691	for (;;) {
2692	if (path_equal(path1: &cur, path2: root))
2693	break;
2694	if (cur.dentry == cur.mnt->mnt_root) {
2695	if (follow_up(&cur))
2696	continue;
2697	goto out_free;
2698	}
2699	if ((ncomponents & 15) == 0) {
2700	struct dentry **new;
2701	new = krealloc(objp: components,
2702	new_size: sizeof(*new) * (ncomponents + 16),
2703	GFP_KERNEL);
2704	if (!new)
2705	goto out_free;
2706	components = new;
2707	}
2708	components[ncomponents++] = cur.dentry;
2709	cur.dentry = dget_parent(dentry: cur.dentry);
2710	}
2711	err = nfserr_resource;
2712	p = xdr_reserve_space(xdr, nbytes: 4);
2713	if (!p)
2714	goto out_free;
2715	*p++ = cpu_to_be32(ncomponents);
2716
2717	while (ncomponents) {
2718	struct dentry *dentry = components[ncomponents - 1];
2719	unsigned int len;
2720
2721	spin_lock(lock: &dentry->d_lock);
2722	len = dentry->d_name.len;
2723	p = xdr_reserve_space(xdr, nbytes: len + 4);
2724	if (!p) {
2725	spin_unlock(lock: &dentry->d_lock);
2726	goto out_free;
2727	}
2728	p = xdr_encode_opaque(p, ptr: dentry->d_name.name, len);
2729	dprintk("/%pd", dentry);
2730	spin_unlock(lock: &dentry->d_lock);
2731	dput(dentry);
2732	ncomponents--;
2733	}
2734
2735	err = 0;
2736	out_free:
2737	dprintk(")\n");
2738	while (ncomponents)
2739	dput(components[--ncomponents]);
2740	kfree(objp: components);
2741	path_put(&cur);
2742	return err;
2743	}
2744
2745	static __be32 nfsd4_encode_fs_locations4(struct xdr_stream *xdr,
2746	struct svc_rqst *rqstp,
2747	struct svc_export *exp)
2748	{
2749	struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2750	struct svc_export *exp_ps;
2751	unsigned int i;
2752	__be32 status;
2753
2754	/* fs_root */
2755	exp_ps = rqst_find_fsidzero_export(rqstp);
2756	if (IS_ERR(ptr: exp_ps))
2757	return nfserrno(errno: PTR_ERR(ptr: exp_ps));
2758	status = nfsd4_encode_pathname4(xdr, root: &exp_ps->ex_path, path: &exp->ex_path);
2759	exp_put(exp: exp_ps);
2760	if (status != nfs_ok)
2761	return status;
2762
2763	/* locations<> */
2764	if (xdr_stream_encode_u32(xdr, n: fslocs->locations_count) != XDR_UNIT)
2765	return nfserr_resource;
2766	for (i = 0; i < fslocs->locations_count; i++) {
2767	status = nfsd4_encode_fs_location4(xdr, location: &fslocs->locations[i]);
2768	if (status != nfs_ok)
2769	return status;
2770	}
2771
2772	return nfs_ok;
2773	}
2774
2775	static __be32 nfsd4_encode_nfsace4(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2776	struct nfs4_ace *ace)
2777	{
2778	__be32 status;
2779
2780	/* type */
2781	status = nfsd4_encode_acetype4(xdr, ace->type);
2782	if (status != nfs_ok)
2783	return nfserr_resource;
2784	/* flag */
2785	status = nfsd4_encode_aceflag4(xdr, ace->flag);
2786	if (status != nfs_ok)
2787	return nfserr_resource;
2788	/* access mask */
2789	status = nfsd4_encode_acemask4(xdr, ace->access_mask & NFS4_ACE_MASK_ALL);
2790	if (status != nfs_ok)
2791	return nfserr_resource;
2792	/* who */
2793	if (ace->whotype != NFS4_ACL_WHO_NAMED)
2794	return nfs4_acl_write_who(xdr, who: ace->whotype);
2795	if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2796	return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2797	return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2798	}
2799
2800	#define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2801	FATTR4_WORD0_RDATTR_ERROR)
2802	#define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2803	#define WORD2_ABSENT_FS_ATTRS 0
2804
2805	#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2806	static inline __be32
2807	nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2808	void *context, int len)
2809	{
2810	__be32 *p;
2811
2812	p = xdr_reserve_space(xdr, nbytes: len + 4 + 4 + 4);
2813	if (!p)
2814	return nfserr_resource;
2815
2816	/*
2817	* For now we use a 0 here to indicate the null translation; in
2818	* the future we may place a call to translation code here.
2819	*/
2820	*p++ = cpu_to_be32(0); /* lfs */
2821	*p++ = cpu_to_be32(0); /* pi */
2822	p = xdr_encode_opaque(p, ptr: context, len);
2823	return 0;
2824	}
2825	#else
2826	static inline __be32
2827	nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2828	void *context, int len)
2829	{ return 0; }
2830	#endif
2831
2832	static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2833	{
2834	/* As per referral draft: */
2835	if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2836	*bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2837	if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2838	*bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2839	*rdattr_err = NFSERR_MOVED;
2840	else
2841	return nfserr_moved;
2842	}
2843	*bmval0 &= WORD0_ABSENT_FS_ATTRS;
2844	*bmval1 &= WORD1_ABSENT_FS_ATTRS;
2845	*bmval2 &= WORD2_ABSENT_FS_ATTRS;
2846	return 0;
2847	}
2848
2849
2850	static int nfsd4_get_mounted_on_ino(struct svc_export *exp, u64 *pino)
2851	{
2852	struct path path = exp->ex_path;
2853	struct kstat stat;
2854	int err;
2855
2856	path_get(&path);
2857	while (follow_up(&path)) {
2858	if (path.dentry != path.mnt->mnt_root)
2859	break;
2860	}
2861	err = vfs_getattr(&path, &stat, STATX_INO, AT_STATX_SYNC_AS_STAT);
2862	path_put(&path);
2863	if (!err)
2864	*pino = stat.ino;
2865	return err;
2866	}
2867
2868	static __be32
2869	nfsd4_encode_bitmap4(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2870	{
2871	__be32 *p;
2872
2873	if (bmval2) {
2874	p = xdr_reserve_space(xdr, XDR_UNIT * 4);
2875	if (!p)
2876	goto out_resource;
2877	*p++ = cpu_to_be32(3);
2878	*p++ = cpu_to_be32(bmval0);
2879	*p++ = cpu_to_be32(bmval1);
2880	*p++ = cpu_to_be32(bmval2);
2881	} else if (bmval1) {
2882	p = xdr_reserve_space(xdr, XDR_UNIT * 3);
2883	if (!p)
2884	goto out_resource;
2885	*p++ = cpu_to_be32(2);
2886	*p++ = cpu_to_be32(bmval0);
2887	*p++ = cpu_to_be32(bmval1);
2888	} else {
2889	p = xdr_reserve_space(xdr, XDR_UNIT * 2);
2890	if (!p)
2891	goto out_resource;
2892	*p++ = cpu_to_be32(1);
2893	*p++ = cpu_to_be32(bmval0);
2894	}
2895
2896	return nfs_ok;
2897	out_resource:
2898	return nfserr_resource;
2899	}
2900
2901	struct nfsd4_fattr_args {
2902	struct svc_rqst *rqstp;
2903	struct svc_fh *fhp;
2904	struct svc_export *exp;
2905	struct dentry *dentry;
2906	struct kstat stat;
2907	struct kstatfs statfs;
2908	struct nfs4_acl *acl;
2909	u64 size;
2910	#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2911	void *context;
2912	int contextlen;
2913	#endif
2914	u32 rdattr_err;
2915	bool contextsupport;
2916	bool ignore_crossmnt;
2917	};
2918
2919	typedef __be32(*nfsd4_enc_attr)(struct xdr_stream *xdr,
2920	const struct nfsd4_fattr_args *args);
2921
2922	static __be32 nfsd4_encode_fattr4__noop(struct xdr_stream *xdr,
2923	const struct nfsd4_fattr_args *args)
2924	{
2925	return nfs_ok;
2926	}
2927
2928	static __be32 nfsd4_encode_fattr4__true(struct xdr_stream *xdr,
2929	const struct nfsd4_fattr_args *args)
2930	{
2931	return nfsd4_encode_bool(xdr, val: true);
2932	}
2933
2934	static __be32 nfsd4_encode_fattr4__false(struct xdr_stream *xdr,
2935	const struct nfsd4_fattr_args *args)
2936	{
2937	return nfsd4_encode_bool(xdr, val: false);
2938	}
2939
2940	static __be32 nfsd4_encode_fattr4_supported_attrs(struct xdr_stream *xdr,
2941	const struct nfsd4_fattr_args *args)
2942	{
2943	struct nfsd4_compoundres *resp = args->rqstp->rq_resp;
2944	u32 minorversion = resp->cstate.minorversion;
2945	u32 supp[3];
2946
2947	memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2948	if (!IS_POSIXACL(d_inode(args->dentry)))
2949	supp[0] &= ~FATTR4_WORD0_ACL;
2950	if (!args->contextsupport)
2951	supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2952
2953	return nfsd4_encode_bitmap4(xdr, bmval0: supp[0], bmval1: supp[1], bmval2: supp[2]);
2954	}
2955
2956	static __be32 nfsd4_encode_fattr4_type(struct xdr_stream *xdr,
2957	const struct nfsd4_fattr_args *args)
2958	{
2959	__be32 *p;
2960
2961	p = xdr_reserve_space(xdr, XDR_UNIT);
2962	if (!p)
2963	return nfserr_resource;
2964
2965	switch (args->stat.mode & S_IFMT) {
2966	case S_IFIFO:
2967	*p = cpu_to_be32(NF4FIFO);
2968	break;
2969	case S_IFCHR:
2970	*p = cpu_to_be32(NF4CHR);
2971	break;
2972	case S_IFDIR:
2973	*p = cpu_to_be32(NF4DIR);
2974	break;
2975	case S_IFBLK:
2976	*p = cpu_to_be32(NF4BLK);
2977	break;
2978	case S_IFLNK:
2979	*p = cpu_to_be32(NF4LNK);
2980	break;
2981	case S_IFREG:
2982	*p = cpu_to_be32(NF4REG);
2983	break;
2984	case S_IFSOCK:
2985	*p = cpu_to_be32(NF4SOCK);
2986	break;
2987	default:
2988	return nfserr_serverfault;
2989	}
2990
2991	return nfs_ok;
2992	}
2993
2994	static __be32 nfsd4_encode_fattr4_fh_expire_type(struct xdr_stream *xdr,
2995	const struct nfsd4_fattr_args *args)
2996	{
2997	u32 mask;
2998
2999	mask = NFS4_FH_PERSISTENT;
3000	if (!(args->exp->ex_flags & NFSEXP_NOSUBTREECHECK))
3001	mask |= NFS4_FH_VOL_RENAME;
3002	return nfsd4_encode_uint32_t(xdr, val: mask);
3003	}
3004
3005	static __be32 nfsd4_encode_fattr4_change(struct xdr_stream *xdr,
3006	const struct nfsd4_fattr_args *args)
3007	{
3008	const struct svc_export *exp = args->exp;
3009	u64 c;
3010
3011	if (unlikely(exp->ex_flags & NFSEXP_V4ROOT)) {
3012	u32 flush_time = convert_to_wallclock(sinceboot: exp->cd->flush_time);
3013
3014	if (xdr_stream_encode_u32(xdr, n: flush_time) != XDR_UNIT)
3015	return nfserr_resource;
3016	if (xdr_stream_encode_u32(xdr, n: 0) != XDR_UNIT)
3017	return nfserr_resource;
3018	return nfs_ok;
3019	}
3020
3021	c = nfsd4_change_attribute(stat: &args->stat, inode: d_inode(dentry: args->dentry));
3022	return nfsd4_encode_changeid4(xdr, c);
3023	}
3024
3025	static __be32 nfsd4_encode_fattr4_size(struct xdr_stream *xdr,
3026	const struct nfsd4_fattr_args *args)
3027	{
3028	return nfsd4_encode_uint64_t(xdr, val: args->size);
3029	}
3030
3031	static __be32 nfsd4_encode_fattr4_fsid(struct xdr_stream *xdr,
3032	const struct nfsd4_fattr_args *args)
3033	{
3034	__be32 *p;
3035
3036	p = xdr_reserve_space(xdr, XDR_UNIT * 2 + XDR_UNIT * 2);
3037	if (!p)
3038	return nfserr_resource;
3039
3040	if (unlikely(args->exp->ex_fslocs.migrated)) {
3041	p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
3042	xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
3043	return nfs_ok;
3044	}
3045	switch (fsid_source(fhp: args->fhp)) {
3046	case FSIDSOURCE_FSID:
3047	p = xdr_encode_hyper(p, val: (u64)args->exp->ex_fsid);
3048	xdr_encode_hyper(p, val: (u64)0);
3049	break;
3050	case FSIDSOURCE_DEV:
3051	*p++ = xdr_zero;
3052	*p++ = cpu_to_be32(MAJOR(args->stat.dev));
3053	*p++ = xdr_zero;
3054	*p = cpu_to_be32(MINOR(args->stat.dev));
3055	break;
3056	case FSIDSOURCE_UUID:
3057	xdr_encode_opaque_fixed(p, ptr: args->exp->ex_uuid, EX_UUID_LEN);
3058	break;
3059	}
3060
3061	return nfs_ok;
3062	}
3063
3064	static __be32 nfsd4_encode_fattr4_lease_time(struct xdr_stream *xdr,
3065	const struct nfsd4_fattr_args *args)
3066	{
3067	struct nfsd_net *nn = net_generic(SVC_NET(args->rqstp), id: nfsd_net_id);
3068
3069	return nfsd4_encode_nfs_lease4(xdr, nn->nfsd4_lease);
3070	}
3071
3072	static __be32 nfsd4_encode_fattr4_rdattr_error(struct xdr_stream *xdr,
3073	const struct nfsd4_fattr_args *args)
3074	{
3075	return nfsd4_encode_uint32_t(xdr, val: args->rdattr_err);
3076	}
3077
3078	static __be32 nfsd4_encode_fattr4_aclsupport(struct xdr_stream *xdr,
3079	const struct nfsd4_fattr_args *args)
3080	{
3081	u32 mask;
3082
3083	mask = 0;
3084	if (IS_POSIXACL(d_inode(args->dentry)))
3085	mask = ACL4_SUPPORT_ALLOW_ACL | ACL4_SUPPORT_DENY_ACL;
3086	return nfsd4_encode_uint32_t(xdr, val: mask);
3087	}
3088
3089	static __be32 nfsd4_encode_fattr4_acl(struct xdr_stream *xdr,
3090	const struct nfsd4_fattr_args *args)
3091	{
3092	struct nfs4_acl *acl = args->acl;
3093	struct nfs4_ace *ace;
3094	__be32 status;
3095
3096	/* nfsace4<> */
3097	if (!acl) {
3098	if (xdr_stream_encode_u32(xdr, n: 0) != XDR_UNIT)
3099	return nfserr_resource;
3100	} else {
3101	if (xdr_stream_encode_u32(xdr, n: acl->naces) != XDR_UNIT)
3102	return nfserr_resource;
3103	for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
3104	status = nfsd4_encode_nfsace4(xdr, rqstp: args->rqstp, ace);
3105	if (status != nfs_ok)
3106	return status;
3107	}
3108	}
3109	return nfs_ok;
3110	}
3111
3112	static __be32 nfsd4_encode_fattr4_filehandle(struct xdr_stream *xdr,
3113	const struct nfsd4_fattr_args *args)
3114	{
3115	return nfsd4_encode_nfs_fh4(xdr, fh_handle: &args->fhp->fh_handle);
3116	}
3117
3118	static __be32 nfsd4_encode_fattr4_fileid(struct xdr_stream *xdr,
3119	const struct nfsd4_fattr_args *args)
3120	{
3121	return nfsd4_encode_uint64_t(xdr, val: args->stat.ino);
3122	}
3123
3124	static __be32 nfsd4_encode_fattr4_files_avail(struct xdr_stream *xdr,
3125	const struct nfsd4_fattr_args *args)
3126	{
3127	return nfsd4_encode_uint64_t(xdr, val: args->statfs.f_ffree);
3128	}
3129
3130	static __be32 nfsd4_encode_fattr4_files_free(struct xdr_stream *xdr,
3131	const struct nfsd4_fattr_args *args)
3132	{
3133	return nfsd4_encode_uint64_t(xdr, val: args->statfs.f_ffree);
3134	}
3135
3136	static __be32 nfsd4_encode_fattr4_files_total(struct xdr_stream *xdr,
3137	const struct nfsd4_fattr_args *args)
3138	{
3139	return nfsd4_encode_uint64_t(xdr, val: args->statfs.f_files);
3140	}
3141
3142	static __be32 nfsd4_encode_fattr4_fs_locations(struct xdr_stream *xdr,
3143	const struct nfsd4_fattr_args *args)
3144	{
3145	return nfsd4_encode_fs_locations4(xdr, rqstp: args->rqstp, exp: args->exp);
3146	}
3147
3148	static __be32 nfsd4_encode_fattr4_maxfilesize(struct xdr_stream *xdr,
3149	const struct nfsd4_fattr_args *args)
3150	{
3151	struct super_block *sb = args->exp->ex_path.mnt->mnt_sb;
3152
3153	return nfsd4_encode_uint64_t(xdr, val: sb->s_maxbytes);
3154	}
3155
3156	static __be32 nfsd4_encode_fattr4_maxlink(struct xdr_stream *xdr,
3157	const struct nfsd4_fattr_args *args)
3158	{
3159	return nfsd4_encode_uint32_t(xdr, val: 255);
3160	}
3161
3162	static __be32 nfsd4_encode_fattr4_maxname(struct xdr_stream *xdr,
3163	const struct nfsd4_fattr_args *args)
3164	{
3165	return nfsd4_encode_uint32_t(xdr, val: args->statfs.f_namelen);
3166	}
3167
3168	static __be32 nfsd4_encode_fattr4_maxread(struct xdr_stream *xdr,
3169	const struct nfsd4_fattr_args *args)
3170	{
3171	return nfsd4_encode_uint64_t(xdr, val: svc_max_payload(rqstp: args->rqstp));
3172	}
3173
3174	static __be32 nfsd4_encode_fattr4_maxwrite(struct xdr_stream *xdr,
3175	const struct nfsd4_fattr_args *args)
3176	{
3177	return nfsd4_encode_uint64_t(xdr, val: svc_max_payload(rqstp: args->rqstp));
3178	}
3179
3180	static __be32 nfsd4_encode_fattr4_mode(struct xdr_stream *xdr,
3181	const struct nfsd4_fattr_args *args)
3182	{
3183	return nfsd4_encode_mode4(xdr, args->stat.mode & S_IALLUGO);
3184	}
3185
3186	static __be32 nfsd4_encode_fattr4_numlinks(struct xdr_stream *xdr,
3187	const struct nfsd4_fattr_args *args)
3188	{
3189	return nfsd4_encode_uint32_t(xdr, val: args->stat.nlink);
3190	}
3191
3192	static __be32 nfsd4_encode_fattr4_owner(struct xdr_stream *xdr,
3193	const struct nfsd4_fattr_args *args)
3194	{
3195	return nfsd4_encode_user(xdr, args->rqstp, args->stat.uid);
3196	}
3197
3198	static __be32 nfsd4_encode_fattr4_owner_group(struct xdr_stream *xdr,
3199	const struct nfsd4_fattr_args *args)
3200	{
3201	return nfsd4_encode_group(xdr, args->rqstp, args->stat.gid);
3202	}
3203
3204	static __be32 nfsd4_encode_fattr4_rawdev(struct xdr_stream *xdr,
3205	const struct nfsd4_fattr_args *args)
3206	{
3207	return nfsd4_encode_specdata4(xdr, MAJOR(args->stat.rdev),
3208	MINOR(args->stat.rdev));
3209	}
3210
3211	static __be32 nfsd4_encode_fattr4_space_avail(struct xdr_stream *xdr,
3212	const struct nfsd4_fattr_args *args)
3213	{
3214	u64 avail = (u64)args->statfs.f_bavail * (u64)args->statfs.f_bsize;
3215
3216	return nfsd4_encode_uint64_t(xdr, val: avail);
3217	}
3218
3219	static __be32 nfsd4_encode_fattr4_space_free(struct xdr_stream *xdr,
3220	const struct nfsd4_fattr_args *args)
3221	{
3222	u64 free = (u64)args->statfs.f_bfree * (u64)args->statfs.f_bsize;
3223
3224	return nfsd4_encode_uint64_t(xdr, val: free);
3225	}
3226
3227	static __be32 nfsd4_encode_fattr4_space_total(struct xdr_stream *xdr,
3228	const struct nfsd4_fattr_args *args)
3229	{
3230	u64 total = (u64)args->statfs.f_blocks * (u64)args->statfs.f_bsize;
3231
3232	return nfsd4_encode_uint64_t(xdr, val: total);
3233	}
3234
3235	static __be32 nfsd4_encode_fattr4_space_used(struct xdr_stream *xdr,
3236	const struct nfsd4_fattr_args *args)
3237	{
3238	return nfsd4_encode_uint64_t(xdr, val: (u64)args->stat.blocks << 9);
3239	}
3240
3241	static __be32 nfsd4_encode_fattr4_time_access(struct xdr_stream *xdr,
3242	const struct nfsd4_fattr_args *args)
3243	{
3244	return nfsd4_encode_nfstime4(xdr, tv: &args->stat.atime);
3245	}
3246
3247	static __be32 nfsd4_encode_fattr4_time_create(struct xdr_stream *xdr,
3248	const struct nfsd4_fattr_args *args)
3249	{
3250	return nfsd4_encode_nfstime4(xdr, tv: &args->stat.btime);
3251	}
3252
3253	/*
3254	* ctime (in NFSv4, time_metadata) is not writeable, and the client
3255	* doesn't really care what resolution could theoretically be stored by
3256	* the filesystem.
3257	*
3258	* The client cares how close together changes can be while still
3259	* guaranteeing ctime changes. For most filesystems (which have
3260	* timestamps with nanosecond fields) that is limited by the resolution
3261	* of the time returned from current_time() (which I'm assuming to be
3262	* 1/HZ).
3263	*/
3264	static __be32 nfsd4_encode_fattr4_time_delta(struct xdr_stream *xdr,
3265	const struct nfsd4_fattr_args *args)
3266	{
3267	const struct inode *inode = d_inode(dentry: args->dentry);
3268	u32 ns = max_t(u32, NSEC_PER_SEC/HZ, inode->i_sb->s_time_gran);
3269	struct timespec64 ts = ns_to_timespec64(nsec: ns);
3270
3271	return nfsd4_encode_nfstime4(xdr, tv: &ts);
3272	}
3273
3274	static __be32 nfsd4_encode_fattr4_time_metadata(struct xdr_stream *xdr,
3275	const struct nfsd4_fattr_args *args)
3276	{
3277	return nfsd4_encode_nfstime4(xdr, tv: &args->stat.ctime);
3278	}
3279
3280	static __be32 nfsd4_encode_fattr4_time_modify(struct xdr_stream *xdr,
3281	const struct nfsd4_fattr_args *args)
3282	{
3283	return nfsd4_encode_nfstime4(xdr, tv: &args->stat.mtime);
3284	}
3285
3286	static __be32 nfsd4_encode_fattr4_mounted_on_fileid(struct xdr_stream *xdr,
3287	const struct nfsd4_fattr_args *args)
3288	{
3289	u64 ino;
3290	int err;
3291
3292	if (!args->ignore_crossmnt &&
3293	args->dentry == args->exp->ex_path.mnt->mnt_root) {
3294	err = nfsd4_get_mounted_on_ino(exp: args->exp, pino: &ino);
3295	if (err)
3296	return nfserrno(errno: err);
3297	} else
3298	ino = args->stat.ino;
3299
3300	return nfsd4_encode_uint64_t(xdr, val: ino);
3301	}
3302
3303	#ifdef CONFIG_NFSD_PNFS
3304
3305	static __be32 nfsd4_encode_fattr4_fs_layout_types(struct xdr_stream *xdr,
3306	const struct nfsd4_fattr_args *args)
3307	{
3308	unsigned long mask = args->exp->ex_layout_types;
3309	int i;
3310
3311	/* Hamming weight of @mask is the number of layout types to return */
3312	if (xdr_stream_encode_u32(xdr, n: hweight_long(w: mask)) != XDR_UNIT)
3313	return nfserr_resource;
3314	for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
3315	if (mask & BIT(i)) {
3316	/* layouttype4 */
3317	if (xdr_stream_encode_u32(xdr, n: i) != XDR_UNIT)
3318	return nfserr_resource;
3319	}
3320	return nfs_ok;
3321	}
3322
3323	static __be32 nfsd4_encode_fattr4_layout_types(struct xdr_stream *xdr,
3324	const struct nfsd4_fattr_args *args)
3325	{
3326	unsigned long mask = args->exp->ex_layout_types;
3327	int i;
3328
3329	/* Hamming weight of @mask is the number of layout types to return */
3330	if (xdr_stream_encode_u32(xdr, n: hweight_long(w: mask)) != XDR_UNIT)
3331	return nfserr_resource;
3332	for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
3333	if (mask & BIT(i)) {
3334	/* layouttype4 */
3335	if (xdr_stream_encode_u32(xdr, n: i) != XDR_UNIT)
3336	return nfserr_resource;
3337	}
3338	return nfs_ok;
3339	}
3340
3341	static __be32 nfsd4_encode_fattr4_layout_blksize(struct xdr_stream *xdr,
3342	const struct nfsd4_fattr_args *args)
3343	{
3344	return nfsd4_encode_uint32_t(xdr, val: args->stat.blksize);
3345	}
3346
3347	#endif
3348
3349	static __be32 nfsd4_encode_fattr4_suppattr_exclcreat(struct xdr_stream *xdr,
3350	const struct nfsd4_fattr_args *args)
3351	{
3352	struct nfsd4_compoundres *resp = args->rqstp->rq_resp;
3353	u32 supp[3];
3354
3355	memcpy(supp, nfsd_suppattrs[resp->cstate.minorversion], sizeof(supp));
3356	supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
3357	supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
3358	supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
3359
3360	return nfsd4_encode_bitmap4(xdr, bmval0: supp[0], bmval1: supp[1], bmval2: supp[2]);
3361	}
3362
3363	#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3364	static __be32 nfsd4_encode_fattr4_sec_label(struct xdr_stream *xdr,
3365	const struct nfsd4_fattr_args *args)
3366	{
3367	return nfsd4_encode_security_label(xdr, rqstp: args->rqstp,
3368	context: args->context, len: args->contextlen);
3369	}
3370	#endif
3371
3372	static __be32 nfsd4_encode_fattr4_xattr_support(struct xdr_stream *xdr,
3373	const struct nfsd4_fattr_args *args)
3374	{
3375	int err = xattr_supports_user_prefix(inode: d_inode(dentry: args->dentry));
3376
3377	return nfsd4_encode_bool(xdr, val: err == 0);
3378	}
3379
3380	static const nfsd4_enc_attr nfsd4_enc_fattr4_encode_ops[] = {
3381	[FATTR4_SUPPORTED_ATTRS] = nfsd4_encode_fattr4_supported_attrs,
3382	[FATTR4_TYPE] = nfsd4_encode_fattr4_type,
3383	[FATTR4_FH_EXPIRE_TYPE] = nfsd4_encode_fattr4_fh_expire_type,
3384	[FATTR4_CHANGE] = nfsd4_encode_fattr4_change,
3385	[FATTR4_SIZE] = nfsd4_encode_fattr4_size,
3386	[FATTR4_LINK_SUPPORT] = nfsd4_encode_fattr4__true,
3387	[FATTR4_SYMLINK_SUPPORT] = nfsd4_encode_fattr4__true,
3388	[FATTR4_NAMED_ATTR] = nfsd4_encode_fattr4__false,
3389	[FATTR4_FSID] = nfsd4_encode_fattr4_fsid,
3390	[FATTR4_UNIQUE_HANDLES] = nfsd4_encode_fattr4__true,
3391	[FATTR4_LEASE_TIME] = nfsd4_encode_fattr4_lease_time,
3392	[FATTR4_RDATTR_ERROR] = nfsd4_encode_fattr4_rdattr_error,
3393	[FATTR4_ACL] = nfsd4_encode_fattr4_acl,
3394	[FATTR4_ACLSUPPORT] = nfsd4_encode_fattr4_aclsupport,
3395	[FATTR4_ARCHIVE] = nfsd4_encode_fattr4__noop,
3396	[FATTR4_CANSETTIME] = nfsd4_encode_fattr4__true,
3397	[FATTR4_CASE_INSENSITIVE] = nfsd4_encode_fattr4__false,
3398	[FATTR4_CASE_PRESERVING] = nfsd4_encode_fattr4__true,
3399	[FATTR4_CHOWN_RESTRICTED] = nfsd4_encode_fattr4__true,
3400	[FATTR4_FILEHANDLE] = nfsd4_encode_fattr4_filehandle,
3401	[FATTR4_FILEID] = nfsd4_encode_fattr4_fileid,
3402	[FATTR4_FILES_AVAIL] = nfsd4_encode_fattr4_files_avail,
3403	[FATTR4_FILES_FREE] = nfsd4_encode_fattr4_files_free,
3404	[FATTR4_FILES_TOTAL] = nfsd4_encode_fattr4_files_total,
3405	[FATTR4_FS_LOCATIONS] = nfsd4_encode_fattr4_fs_locations,
3406	[FATTR4_HIDDEN] = nfsd4_encode_fattr4__noop,
3407	[FATTR4_HOMOGENEOUS] = nfsd4_encode_fattr4__true,
3408	[FATTR4_MAXFILESIZE] = nfsd4_encode_fattr4_maxfilesize,
3409	[FATTR4_MAXLINK] = nfsd4_encode_fattr4_maxlink,
3410	[FATTR4_MAXNAME] = nfsd4_encode_fattr4_maxname,
3411	[FATTR4_MAXREAD] = nfsd4_encode_fattr4_maxread,
3412	[FATTR4_MAXWRITE] = nfsd4_encode_fattr4_maxwrite,
3413	[FATTR4_MIMETYPE] = nfsd4_encode_fattr4__noop,
3414	[FATTR4_MODE] = nfsd4_encode_fattr4_mode,
3415	[FATTR4_NO_TRUNC] = nfsd4_encode_fattr4__true,
3416	[FATTR4_NUMLINKS] = nfsd4_encode_fattr4_numlinks,
3417	[FATTR4_OWNER] = nfsd4_encode_fattr4_owner,
3418	[FATTR4_OWNER_GROUP] = nfsd4_encode_fattr4_owner_group,
3419	[FATTR4_QUOTA_AVAIL_HARD] = nfsd4_encode_fattr4__noop,
3420	[FATTR4_QUOTA_AVAIL_SOFT] = nfsd4_encode_fattr4__noop,
3421	[FATTR4_QUOTA_USED] = nfsd4_encode_fattr4__noop,
3422	[FATTR4_RAWDEV] = nfsd4_encode_fattr4_rawdev,
3423	[FATTR4_SPACE_AVAIL] = nfsd4_encode_fattr4_space_avail,
3424	[FATTR4_SPACE_FREE] = nfsd4_encode_fattr4_space_free,
3425	[FATTR4_SPACE_TOTAL] = nfsd4_encode_fattr4_space_total,
3426	[FATTR4_SPACE_USED] = nfsd4_encode_fattr4_space_used,
3427	[FATTR4_SYSTEM] = nfsd4_encode_fattr4__noop,
3428	[FATTR4_TIME_ACCESS] = nfsd4_encode_fattr4_time_access,
3429	[FATTR4_TIME_ACCESS_SET] = nfsd4_encode_fattr4__noop,
3430	[FATTR4_TIME_BACKUP] = nfsd4_encode_fattr4__noop,
3431	[FATTR4_TIME_CREATE] = nfsd4_encode_fattr4_time_create,
3432	[FATTR4_TIME_DELTA] = nfsd4_encode_fattr4_time_delta,
3433	[FATTR4_TIME_METADATA] = nfsd4_encode_fattr4_time_metadata,
3434	[FATTR4_TIME_MODIFY] = nfsd4_encode_fattr4_time_modify,
3435	[FATTR4_TIME_MODIFY_SET] = nfsd4_encode_fattr4__noop,
3436	[FATTR4_MOUNTED_ON_FILEID] = nfsd4_encode_fattr4_mounted_on_fileid,
3437	[FATTR4_DIR_NOTIF_DELAY] = nfsd4_encode_fattr4__noop,
3438	[FATTR4_DIRENT_NOTIF_DELAY] = nfsd4_encode_fattr4__noop,
3439	[FATTR4_DACL] = nfsd4_encode_fattr4__noop,
3440	[FATTR4_SACL] = nfsd4_encode_fattr4__noop,
3441	[FATTR4_CHANGE_POLICY] = nfsd4_encode_fattr4__noop,
3442	[FATTR4_FS_STATUS] = nfsd4_encode_fattr4__noop,
3443
3444	#ifdef CONFIG_NFSD_PNFS
3445	[FATTR4_FS_LAYOUT_TYPES] = nfsd4_encode_fattr4_fs_layout_types,
3446	[FATTR4_LAYOUT_HINT] = nfsd4_encode_fattr4__noop,
3447	[FATTR4_LAYOUT_TYPES] = nfsd4_encode_fattr4_layout_types,
3448	[FATTR4_LAYOUT_BLKSIZE] = nfsd4_encode_fattr4_layout_blksize,
3449	[FATTR4_LAYOUT_ALIGNMENT] = nfsd4_encode_fattr4__noop,
3450	#else
3451	[FATTR4_FS_LAYOUT_TYPES] = nfsd4_encode_fattr4__noop,
3452	[FATTR4_LAYOUT_HINT] = nfsd4_encode_fattr4__noop,
3453	[FATTR4_LAYOUT_TYPES] = nfsd4_encode_fattr4__noop,
3454	[FATTR4_LAYOUT_BLKSIZE] = nfsd4_encode_fattr4__noop,
3455	[FATTR4_LAYOUT_ALIGNMENT] = nfsd4_encode_fattr4__noop,
3456	#endif
3457
3458	[FATTR4_FS_LOCATIONS_INFO] = nfsd4_encode_fattr4__noop,
3459	[FATTR4_MDSTHRESHOLD] = nfsd4_encode_fattr4__noop,
3460	[FATTR4_RETENTION_GET] = nfsd4_encode_fattr4__noop,
3461	[FATTR4_RETENTION_SET] = nfsd4_encode_fattr4__noop,
3462	[FATTR4_RETENTEVT_GET] = nfsd4_encode_fattr4__noop,
3463	[FATTR4_RETENTEVT_SET] = nfsd4_encode_fattr4__noop,
3464	[FATTR4_RETENTION_HOLD] = nfsd4_encode_fattr4__noop,
3465	[FATTR4_MODE_SET_MASKED] = nfsd4_encode_fattr4__noop,
3466	[FATTR4_SUPPATTR_EXCLCREAT] = nfsd4_encode_fattr4_suppattr_exclcreat,
3467	[FATTR4_FS_CHARSET_CAP] = nfsd4_encode_fattr4__noop,
3468	[FATTR4_CLONE_BLKSIZE] = nfsd4_encode_fattr4__noop,
3469	[FATTR4_SPACE_FREED] = nfsd4_encode_fattr4__noop,
3470	[FATTR4_CHANGE_ATTR_TYPE] = nfsd4_encode_fattr4__noop,
3471
3472	#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3473	[FATTR4_SEC_LABEL] = nfsd4_encode_fattr4_sec_label,
3474	#else
3475	[FATTR4_SEC_LABEL] = nfsd4_encode_fattr4__noop,
3476	#endif
3477
3478	[FATTR4_MODE_UMASK] = nfsd4_encode_fattr4__noop,
3479	[FATTR4_XATTR_SUPPORT] = nfsd4_encode_fattr4_xattr_support,
3480	};
3481
3482	/*
3483	* Note: @fhp can be NULL; in this case, we might have to compose the filehandle
3484	* ourselves.
3485	*/
3486	static __be32
3487	nfsd4_encode_fattr4(struct svc_rqst *rqstp, struct xdr_stream *xdr,
3488	struct svc_fh *fhp, struct svc_export *exp,
3489	struct dentry *dentry, const u32 *bmval,
3490	int ignore_crossmnt)
3491	{
3492	struct nfsd4_fattr_args args;
3493	struct svc_fh *tempfh = NULL;
3494	int starting_len = xdr->buf->len;
3495	__be32 *attrlen_p, status;
3496	int attrlen_offset;
3497	int err;
3498	struct nfsd4_compoundres *resp = rqstp->rq_resp;
3499	u32 minorversion = resp->cstate.minorversion;
3500	struct path path = {
3501	.mnt = exp->ex_path.mnt,
3502	.dentry = dentry,
3503	};
3504	union {
3505	u32 attrmask[3];
3506	unsigned long mask[2];
3507	} u;
3508	bool file_modified;
3509	unsigned long bit;
3510	u64 size = 0;
3511
3512	WARN_ON_ONCE(bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1);
3513	WARN_ON_ONCE(!nfsd_attrs_supported(minorversion, bmval));
3514
3515	args.rqstp = rqstp;
3516	args.exp = exp;
3517	args.dentry = dentry;
3518	args.ignore_crossmnt = (ignore_crossmnt != 0);
3519
3520	/*
3521	* Make a local copy of the attribute bitmap that can be modified.
3522	*/
3523	memset(&u, 0, sizeof(u));
3524	u.attrmask[0] = bmval[0];
3525	u.attrmask[1] = bmval[1];
3526	u.attrmask[2] = bmval[2];
3527
3528	args.rdattr_err = 0;
3529	if (exp->ex_fslocs.migrated) {
3530	status = fattr_handle_absent_fs(bmval0: &u.attrmask[0], bmval1: &u.attrmask[1],
3531	bmval2: &u.attrmask[2], rdattr_err: &args.rdattr_err);
3532	if (status)
3533	goto out;
3534	}
3535	args.size = 0;
3536	if (u.attrmask[0] & (FATTR4_WORD0_CHANGE | FATTR4_WORD0_SIZE)) {
3537	status = nfsd4_deleg_getattr_conflict(rqstp, inode: d_inode(dentry),
3538	file_modified: &file_modified, size: &size);
3539	if (status)
3540	goto out;
3541	}
3542
3543	err = vfs_getattr(&path, &args.stat,
3544	STATX_BASIC_STATS | STATX_BTIME | STATX_CHANGE_COOKIE,
3545	AT_STATX_SYNC_AS_STAT);
3546	if (err)
3547	goto out_nfserr;
3548	args.size = file_modified ? size : args.stat.size;
3549
3550	if (!(args.stat.result_mask & STATX_BTIME))
3551	/* underlying FS does not offer btime so we can't share it */
3552	u.attrmask[1] &= ~FATTR4_WORD1_TIME_CREATE;
3553	if ((u.attrmask[0] & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
3554	FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
3555	(u.attrmask[1] & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
3556	FATTR4_WORD1_SPACE_TOTAL))) {
3557	err = vfs_statfs(&path, &args.statfs);
3558	if (err)
3559	goto out_nfserr;
3560	}
3561	if ((u.attrmask[0] & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) &&
3562	!fhp) {
3563	tempfh = kmalloc(size: sizeof(struct svc_fh), GFP_KERNEL);
3564	status = nfserr_jukebox;
3565	if (!tempfh)
3566	goto out;
3567	fh_init(fhp: tempfh, NFS4_FHSIZE);
3568	status = fh_compose(tempfh, exp, dentry, NULL);
3569	if (status)
3570	goto out;
3571	args.fhp = tempfh;
3572	} else
3573	args.fhp = fhp;
3574
3575	args.acl = NULL;
3576	if (u.attrmask[0] & FATTR4_WORD0_ACL) {
3577	err = nfsd4_get_nfs4_acl(rqstp, dentry, acl: &args.acl);
3578	if (err == -EOPNOTSUPP)
3579	u.attrmask[0] &= ~FATTR4_WORD0_ACL;
3580	else if (err == -EINVAL) {
3581	status = nfserr_attrnotsupp;
3582	goto out;
3583	} else if (err != 0)
3584	goto out_nfserr;
3585	}
3586
3587	args.contextsupport = false;
3588
3589	#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3590	args.context = NULL;
3591	if ((u.attrmask[2] & FATTR4_WORD2_SECURITY_LABEL) ||
3592	u.attrmask[0] & FATTR4_WORD0_SUPPORTED_ATTRS) {
3593	if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
3594	err = security_inode_getsecctx(inode: d_inode(dentry),
3595	ctx: &args.context, ctxlen: &args.contextlen);
3596	else
3597	err = -EOPNOTSUPP;
3598	args.contextsupport = (err == 0);
3599	if (u.attrmask[2] & FATTR4_WORD2_SECURITY_LABEL) {
3600	if (err == -EOPNOTSUPP)
3601	u.attrmask[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3602	else if (err)
3603	goto out_nfserr;
3604	}
3605	}
3606	#endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
3607
3608	/* attrmask */
3609	status = nfsd4_encode_bitmap4(xdr, bmval0: u.attrmask[0],
3610	bmval1: u.attrmask[1], bmval2: u.attrmask[2]);
3611	if (status)
3612	goto out;
3613
3614	/* attr_vals */
3615	attrlen_offset = xdr->buf->len;
3616	attrlen_p = xdr_reserve_space(xdr, XDR_UNIT);
3617	if (!attrlen_p)
3618	goto out_resource;
3619	for_each_set_bit(bit, (const unsigned long *)&u.mask,
3620	ARRAY_SIZE(nfsd4_enc_fattr4_encode_ops)) {
3621	status = nfsd4_enc_fattr4_encode_ops[bit](xdr, &args);
3622	if (status != nfs_ok)
3623	goto out;
3624	}
3625	*attrlen_p = cpu_to_be32(xdr->buf->len - attrlen_offset - XDR_UNIT);
3626	status = nfs_ok;
3627
3628	out:
3629	#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3630	if (args.context)
3631	security_release_secctx(secdata: args.context, seclen: args.contextlen);
3632	#endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
3633	kfree(objp: args.acl);
3634	if (tempfh) {
3635	fh_put(tempfh);
3636	kfree(objp: tempfh);
3637	}
3638	if (status)
3639	xdr_truncate_encode(xdr, len: starting_len);
3640	return status;
3641	out_nfserr:
3642	status = nfserrno(errno: err);
3643	goto out;
3644	out_resource:
3645	status = nfserr_resource;
3646	goto out;
3647	}
3648
3649	static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
3650	struct xdr_buf *buf, __be32 *p, int bytes)
3651	{
3652	xdr->scratch.iov_len = 0;
3653	memset(buf, 0, sizeof(struct xdr_buf));
3654	buf->head[0].iov_base = p;
3655	buf->head[0].iov_len = 0;
3656	buf->len = 0;
3657	xdr->buf = buf;
3658	xdr->iov = buf->head;
3659	xdr->p = p;
3660	xdr->end = (void *)p + bytes;
3661	buf->buflen = bytes;
3662	}
3663
3664	__be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
3665	struct svc_fh *fhp, struct svc_export *exp,
3666	struct dentry *dentry, u32 *bmval,
3667	struct svc_rqst *rqstp, int ignore_crossmnt)
3668	{
3669	struct xdr_buf dummy;
3670	struct xdr_stream xdr;
3671	__be32 ret;
3672
3673	svcxdr_init_encode_from_buffer(xdr: &xdr, buf: &dummy, p: *p, bytes: words << 2);
3674	ret = nfsd4_encode_fattr4(rqstp, xdr: &xdr, fhp, exp, dentry, bmval,
3675	ignore_crossmnt);
3676	*p = xdr.p;
3677	return ret;
3678	}
3679
3680	/*
3681	* The buffer space for this field was reserved during a previous
3682	* call to nfsd4_encode_entry4().
3683	*/
3684	static void nfsd4_encode_entry4_nfs_cookie4(const struct nfsd4_readdir *readdir,
3685	u64 offset)
3686	{
3687	__be64 cookie = cpu_to_be64(offset);
3688	struct xdr_stream *xdr = readdir->xdr;
3689
3690	if (!readdir->cookie_offset)
3691	return;
3692	write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset, &cookie,
3693	sizeof(cookie));
3694	}
3695
3696	static inline int attributes_need_mount(u32 *bmval)
3697	{
3698	if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
3699	return 1;
3700	if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
3701	return 1;
3702	return 0;
3703	}
3704
3705	static __be32
3706	nfsd4_encode_entry4_fattr(struct nfsd4_readdir *cd, const char *name,
3707	int namlen)
3708	{
3709	struct svc_export *exp = cd->rd_fhp->fh_export;
3710	struct dentry *dentry;
3711	__be32 nfserr;
3712	int ignore_crossmnt = 0;
3713
3714	dentry = lookup_positive_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
3715	if (IS_ERR(ptr: dentry))
3716	return nfserrno(errno: PTR_ERR(ptr: dentry));
3717
3718	exp_get(exp);
3719	/*
3720	* In the case of a mountpoint, the client may be asking for
3721	* attributes that are only properties of the underlying filesystem
3722	* as opposed to the cross-mounted file system. In such a case,
3723	* we will not follow the cross mount and will fill the attribtutes
3724	* directly from the mountpoint dentry.
3725	*/
3726	if (nfsd_mountpoint(dentry, exp)) {
3727	int err;
3728
3729	if (!(exp->ex_flags & NFSEXP_V4ROOT)
3730	&& !attributes_need_mount(bmval: cd->rd_bmval)) {
3731	ignore_crossmnt = 1;
3732	goto out_encode;
3733	}
3734	/*
3735	* Why the heck aren't we just using nfsd_lookup??
3736	* Different "."/".." handling? Something else?
3737	* At least, add a comment here to explain....
3738	*/
3739	err = nfsd_cross_mnt(rqstp: cd->rd_rqstp, dpp: &dentry, expp: &exp);
3740	if (err) {
3741	nfserr = nfserrno(errno: err);
3742	goto out_put;
3743	}
3744	nfserr = check_nfsd_access(exp, rqstp: cd->rd_rqstp);
3745	if (nfserr)
3746	goto out_put;
3747
3748	}
3749	out_encode:
3750	nfserr = nfsd4_encode_fattr4(rqstp: cd->rd_rqstp, xdr: cd->xdr, NULL, exp, dentry,
3751	bmval: cd->rd_bmval, ignore_crossmnt);
3752	out_put:
3753	dput(dentry);
3754	exp_put(exp);
3755	return nfserr;
3756	}
3757
3758	static __be32
3759	nfsd4_encode_entry4_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
3760	{
3761	__be32 status;
3762
3763	/* attrmask */
3764	status = nfsd4_encode_bitmap4(xdr, FATTR4_WORD0_RDATTR_ERROR, bmval1: 0, bmval2: 0);
3765	if (status != nfs_ok)
3766	return status;
3767	/* attr_vals */
3768	if (xdr_stream_encode_u32(xdr, XDR_UNIT) != XDR_UNIT)
3769	return nfserr_resource;
3770	/* rdattr_error */
3771	if (xdr_stream_encode_be32(xdr, n: nfserr) != XDR_UNIT)
3772	return nfserr_resource;
3773	return nfs_ok;
3774	}
3775
3776	static int
3777	nfsd4_encode_entry4(void *ccdv, const char *name, int namlen,
3778	loff_t offset, u64 ino, unsigned int d_type)
3779	{
3780	struct readdir_cd *ccd = ccdv;
3781	struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
3782	struct xdr_stream *xdr = cd->xdr;
3783	int start_offset = xdr->buf->len;
3784	int cookie_offset;
3785	u32 name_and_cookie;
3786	int entry_bytes;
3787	__be32 nfserr = nfserr_toosmall;
3788
3789	/* In nfsv4, "." and ".." never make it onto the wire.. */
3790	if (name && isdotent(name, namlen)) {
3791	cd->common.err = nfs_ok;
3792	return 0;
3793	}
3794
3795	/* Encode the previous entry's cookie value */
3796	nfsd4_encode_entry4_nfs_cookie4(readdir: cd, offset);
3797
3798	if (xdr_stream_encode_item_present(xdr) != XDR_UNIT)
3799	goto fail;
3800
3801	/* Reserve send buffer space for this entry's cookie value. */
3802	cookie_offset = xdr->buf->len;
3803	if (nfsd4_encode_nfs_cookie4(xdr, OFFSET_MAX) != nfs_ok)
3804	goto fail;
3805	if (nfsd4_encode_component4(xdr, name, namlen) != nfs_ok)
3806	goto fail;
3807	nfserr = nfsd4_encode_entry4_fattr(cd, name, namlen);
3808	switch (nfserr) {
3809	case nfs_ok:
3810	break;
3811	case nfserr_resource:
3812	nfserr = nfserr_toosmall;
3813	goto fail;
3814	case nfserr_noent:
3815	xdr_truncate_encode(xdr, len: start_offset);
3816	goto skip_entry;
3817	case nfserr_jukebox:
3818	/*
3819	* The pseudoroot should only display dentries that lead to
3820	* exports. If we get EJUKEBOX here, then we can't tell whether
3821	* this entry should be included. Just fail the whole READDIR
3822	* with NFS4ERR_DELAY in that case, and hope that the situation
3823	* will resolve itself by the client's next attempt.
3824	*/
3825	if (cd->rd_fhp->fh_export->ex_flags & NFSEXP_V4ROOT)
3826	goto fail;
3827	fallthrough;
3828	default:
3829	/*
3830	* If the client requested the RDATTR_ERROR attribute,
3831	* we stuff the error code into this attribute
3832	* and continue. If this attribute was not requested,
3833	* then in accordance with the spec, we fail the
3834	* entire READDIR operation(!)
3835	*/
3836	if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3837	goto fail;
3838	if (nfsd4_encode_entry4_rdattr_error(xdr, nfserr)) {
3839	nfserr = nfserr_toosmall;
3840	goto fail;
3841	}
3842	}
3843	nfserr = nfserr_toosmall;
3844	entry_bytes = xdr->buf->len - start_offset;
3845	if (entry_bytes > cd->rd_maxcount)
3846	goto fail;
3847	cd->rd_maxcount -= entry_bytes;
3848	/*
3849	* RFC 3530 14.2.24 describes rd_dircount as only a "hint", and
3850	* notes that it could be zero. If it is zero, then the server
3851	* should enforce only the rd_maxcount value.
3852	*/
3853	if (cd->rd_dircount) {
3854	name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3855	if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3856	goto fail;
3857	cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3858	if (!cd->rd_dircount)
3859	cd->rd_maxcount = 0;
3860	}
3861
3862	cd->cookie_offset = cookie_offset;
3863	skip_entry:
3864	cd->common.err = nfs_ok;
3865	return 0;
3866	fail:
3867	xdr_truncate_encode(xdr, len: start_offset);
3868	cd->common.err = nfserr;
3869	return -EINVAL;
3870	}
3871
3872	static __be32
3873	nfsd4_encode_verifier4(struct xdr_stream *xdr, const nfs4_verifier *verf)
3874	{
3875	__be32 *p;
3876
3877	p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3878	if (!p)
3879	return nfserr_resource;
3880	memcpy(p, verf->data, sizeof(verf->data));
3881	return nfs_ok;
3882	}
3883
3884	static __be32
3885	nfsd4_encode_clientid4(struct xdr_stream *xdr, const clientid_t *clientid)
3886	{
3887	__be32 *p;
3888
3889	p = xdr_reserve_space(xdr, nbytes: sizeof(__be64));
3890	if (!p)
3891	return nfserr_resource;
3892	memcpy(p, clientid, sizeof(*clientid));
3893	return nfs_ok;
3894	}
3895
3896	/* This is a frequently-encoded item; open-coded for speed */
3897	static __be32
3898	nfsd4_encode_stateid4(struct xdr_stream *xdr, const stateid_t *sid)
3899	{
3900	__be32 *p;
3901
3902	p = xdr_reserve_space(xdr, NFS4_STATEID_SIZE);
3903	if (!p)
3904	return nfserr_resource;
3905	*p++ = cpu_to_be32(sid->si_generation);
3906	memcpy(p, &sid->si_opaque, sizeof(sid->si_opaque));
3907	return nfs_ok;
3908	}
3909
3910	static __be32
3911	nfsd4_encode_sessionid4(struct xdr_stream *xdr,
3912	const struct nfs4_sessionid *sessionid)
3913	{
3914	return nfsd4_encode_opaque_fixed(xdr, data: sessionid->data,
3915	NFS4_MAX_SESSIONID_LEN);
3916	}
3917
3918	static __be32
3919	nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr,
3920	union nfsd4_op_u *u)
3921	{
3922	struct nfsd4_access *access = &u->access;
3923	struct xdr_stream *xdr = resp->xdr;
3924	__be32 status;
3925
3926	/* supported */
3927	status = nfsd4_encode_uint32_t(xdr, val: access->ac_supported);
3928	if (status != nfs_ok)
3929	return status;
3930	/* access */
3931	return nfsd4_encode_uint32_t(xdr, val: access->ac_resp_access);
3932	}
3933
3934	static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3935	union nfsd4_op_u *u)
3936	{
3937	struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
3938	struct xdr_stream *xdr = resp->xdr;
3939
3940	/* bctsr_sessid */
3941	nfserr = nfsd4_encode_sessionid4(xdr, sessionid: &bcts->sessionid);
3942	if (nfserr != nfs_ok)
3943	return nfserr;
3944	/* bctsr_dir */
3945	if (xdr_stream_encode_u32(xdr, n: bcts->dir) != XDR_UNIT)
3946	return nfserr_resource;
3947	/* bctsr_use_conn_in_rdma_mode */
3948	return nfsd4_encode_bool(xdr, val: false);
3949	}
3950
3951	static __be32
3952	nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr,
3953	union nfsd4_op_u *u)
3954	{
3955	struct nfsd4_close *close = &u->close;
3956	struct xdr_stream *xdr = resp->xdr;
3957
3958	/* open_stateid */
3959	return nfsd4_encode_stateid4(xdr, sid: &close->cl_stateid);
3960	}
3961
3962
3963	static __be32
3964	nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr,
3965	union nfsd4_op_u *u)
3966	{
3967	struct nfsd4_commit *commit = &u->commit;
3968
3969	return nfsd4_encode_verifier4(xdr: resp->xdr, verf: &commit->co_verf);
3970	}
3971
3972	static __be32
3973	nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr,
3974	union nfsd4_op_u *u)
3975	{
3976	struct nfsd4_create *create = &u->create;
3977	struct xdr_stream *xdr = resp->xdr;
3978
3979	/* cinfo */
3980	nfserr = nfsd4_encode_change_info4(xdr, c: &create->cr_cinfo);
3981	if (nfserr)
3982	return nfserr;
3983	/* attrset */
3984	return nfsd4_encode_bitmap4(xdr, bmval0: create->cr_bmval[0],
3985	bmval1: create->cr_bmval[1], bmval2: create->cr_bmval[2]);
3986	}
3987
3988	static __be32
3989	nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr,
3990	union nfsd4_op_u *u)
3991	{
3992	struct nfsd4_getattr *getattr = &u->getattr;
3993	struct svc_fh *fhp = getattr->ga_fhp;
3994	struct xdr_stream *xdr = resp->xdr;
3995
3996	/* obj_attributes */
3997	return nfsd4_encode_fattr4(rqstp: resp->rqstp, xdr, fhp, exp: fhp->fh_export,
3998	dentry: fhp->fh_dentry, bmval: getattr->ga_bmval, ignore_crossmnt: 0);
3999	}
4000
4001	static __be32
4002	nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr,
4003	union nfsd4_op_u *u)
4004	{
4005	struct xdr_stream *xdr = resp->xdr;
4006	struct svc_fh *fhp = u->getfh;
4007
4008	/* object */
4009	return nfsd4_encode_nfs_fh4(xdr, fh_handle: &fhp->fh_handle);
4010	}
4011
4012	static __be32
4013	nfsd4_encode_lock_owner4(struct xdr_stream *xdr, const clientid_t *clientid,
4014	const struct xdr_netobj *owner)
4015	{
4016	__be32 status;
4017
4018	/* clientid */
4019	status = nfsd4_encode_clientid4(xdr, clientid);
4020	if (status != nfs_ok)
4021	return status;
4022	/* owner */
4023	return nfsd4_encode_opaque(xdr, data: owner->data, size: owner->len);
4024	}
4025
4026	static __be32
4027	nfsd4_encode_lock4denied(struct xdr_stream *xdr,
4028	const struct nfsd4_lock_denied *ld)
4029	{
4030	__be32 status;
4031
4032	/* offset */
4033	status = nfsd4_encode_offset4(xdr, ld->ld_start);
4034	if (status != nfs_ok)
4035	return status;
4036	/* length */
4037	status = nfsd4_encode_length4(xdr, ld->ld_length);
4038	if (status != nfs_ok)
4039	return status;
4040	/* locktype */
4041	if (xdr_stream_encode_u32(xdr, n: ld->ld_type) != XDR_UNIT)
4042	return nfserr_resource;
4043	/* owner */
4044	return nfsd4_encode_lock_owner4(xdr, clientid: &ld->ld_clientid,
4045	owner: &ld->ld_owner);
4046	}
4047
4048	static __be32
4049	nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr,
4050	union nfsd4_op_u *u)
4051	{
4052	struct nfsd4_lock *lock = &u->lock;
4053	struct xdr_stream *xdr = resp->xdr;
4054	__be32 status;
4055
4056	switch (nfserr) {
4057	case nfs_ok:
4058	/* resok4 */
4059	status = nfsd4_encode_stateid4(xdr, sid: &lock->lk_resp_stateid);
4060	break;
4061	case nfserr_denied:
4062	/* denied */
4063	status = nfsd4_encode_lock4denied(xdr, ld: &lock->lk_denied);
4064	break;
4065	default:
4066	return nfserr;
4067	}
4068	return status != nfs_ok ? status : nfserr;
4069	}
4070
4071	static __be32
4072	nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr,
4073	union nfsd4_op_u *u)
4074	{
4075	struct nfsd4_lockt *lockt = &u->lockt;
4076	struct xdr_stream *xdr = resp->xdr;
4077	__be32 status;
4078
4079	if (nfserr == nfserr_denied) {
4080	/* denied */
4081	status = nfsd4_encode_lock4denied(xdr, ld: &lockt->lt_denied);
4082	if (status != nfs_ok)
4083	return status;
4084	}
4085	return nfserr;
4086	}
4087
4088	static __be32
4089	nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr,
4090	union nfsd4_op_u *u)
4091	{
4092	struct nfsd4_locku *locku = &u->locku;
4093	struct xdr_stream *xdr = resp->xdr;
4094
4095	/* lock_stateid */
4096	return nfsd4_encode_stateid4(xdr, sid: &locku->lu_stateid);
4097	}
4098
4099
4100	static __be32
4101	nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr,
4102	union nfsd4_op_u *u)
4103	{
4104	struct nfsd4_link *link = &u->link;
4105	struct xdr_stream *xdr = resp->xdr;
4106
4107	return nfsd4_encode_change_info4(xdr, c: &link->li_cinfo);
4108	}
4109
4110	/*
4111	* This implementation does not yet support returning an ACE in an
4112	* OPEN that offers a delegation.
4113	*/
4114	static __be32
4115	nfsd4_encode_open_nfsace4(struct xdr_stream *xdr)
4116	{
4117	__be32 status;
4118
4119	/* type */
4120	status = nfsd4_encode_acetype4(xdr, NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
4121	if (status != nfs_ok)
4122	return nfserr_resource;
4123	/* flag */
4124	status = nfsd4_encode_aceflag4(xdr, 0);
4125	if (status != nfs_ok)
4126	return nfserr_resource;
4127	/* access mask */
4128	status = nfsd4_encode_acemask4(xdr, 0);
4129	if (status != nfs_ok)
4130	return nfserr_resource;
4131	/* who - empty for now */
4132	if (xdr_stream_encode_u32(xdr, n: 0) != XDR_UNIT)
4133	return nfserr_resource;
4134	return nfs_ok;
4135	}
4136
4137	static __be32
4138	nfsd4_encode_open_read_delegation4(struct xdr_stream *xdr, struct nfsd4_open *open)
4139	{
4140	__be32 status;
4141
4142	/* stateid */
4143	status = nfsd4_encode_stateid4(xdr, sid: &open->op_delegate_stateid);
4144	if (status != nfs_ok)
4145	return status;
4146	/* recall */
4147	status = nfsd4_encode_bool(xdr, val: open->op_recall);
4148	if (status != nfs_ok)
4149	return status;
4150	/* permissions */
4151	return nfsd4_encode_open_nfsace4(xdr);
4152	}
4153
4154	static __be32
4155	nfsd4_encode_nfs_space_limit4(struct xdr_stream *xdr, u64 filesize)
4156	{
4157	/* limitby */
4158	if (xdr_stream_encode_u32(xdr, n: NFS4_LIMIT_SIZE) != XDR_UNIT)
4159	return nfserr_resource;
4160	/* filesize */
4161	return nfsd4_encode_uint64_t(xdr, val: filesize);
4162	}
4163
4164	static __be32
4165	nfsd4_encode_open_write_delegation4(struct xdr_stream *xdr,
4166	struct nfsd4_open *open)
4167	{
4168	__be32 status;
4169
4170	/* stateid */
4171	status = nfsd4_encode_stateid4(xdr, sid: &open->op_delegate_stateid);
4172	if (status != nfs_ok)
4173	return status;
4174	/* recall */
4175	status = nfsd4_encode_bool(xdr, val: open->op_recall);
4176	if (status != nfs_ok)
4177	return status;
4178	/* space_limit */
4179	status = nfsd4_encode_nfs_space_limit4(xdr, filesize: 0);
4180	if (status != nfs_ok)
4181	return status;
4182	return nfsd4_encode_open_nfsace4(xdr);
4183	}
4184
4185	static __be32
4186	nfsd4_encode_open_none_delegation4(struct xdr_stream *xdr,
4187	struct nfsd4_open *open)
4188	{
4189	__be32 status = nfs_ok;
4190
4191	/* ond_why */
4192	if (xdr_stream_encode_u32(xdr, n: open->op_why_no_deleg) != XDR_UNIT)
4193	return nfserr_resource;
4194	switch (open->op_why_no_deleg) {
4195	case WND4_CONTENTION:
4196	/* ond_server_will_push_deleg */
4197	status = nfsd4_encode_bool(xdr, val: false);
4198	break;
4199	case WND4_RESOURCE:
4200	/* ond_server_will_signal_avail */
4201	status = nfsd4_encode_bool(xdr, val: false);
4202	}
4203	return status;
4204	}
4205
4206	static __be32
4207	nfsd4_encode_open_delegation4(struct xdr_stream *xdr, struct nfsd4_open *open)
4208	{
4209	__be32 status;
4210
4211	/* delegation_type */
4212	if (xdr_stream_encode_u32(xdr, n: open->op_delegate_type) != XDR_UNIT)
4213	return nfserr_resource;
4214	switch (open->op_delegate_type) {
4215	case NFS4_OPEN_DELEGATE_NONE:
4216	status = nfs_ok;
4217	break;
4218	case NFS4_OPEN_DELEGATE_READ:
4219	/* read */
4220	status = nfsd4_encode_open_read_delegation4(xdr, open);
4221	break;
4222	case NFS4_OPEN_DELEGATE_WRITE:
4223	/* write */
4224	status = nfsd4_encode_open_write_delegation4(xdr, open);
4225	break;
4226	case NFS4_OPEN_DELEGATE_NONE_EXT:
4227	/* od_whynone */
4228	status = nfsd4_encode_open_none_delegation4(xdr, open);
4229	break;
4230	default:
4231	status = nfserr_serverfault;
4232	}
4233
4234	return status;
4235	}
4236
4237	static __be32
4238	nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr,
4239	union nfsd4_op_u *u)
4240	{
4241	struct nfsd4_open *open = &u->open;
4242	struct xdr_stream *xdr = resp->xdr;
4243
4244	/* stateid */
4245	nfserr = nfsd4_encode_stateid4(xdr, sid: &open->op_stateid);
4246	if (nfserr != nfs_ok)
4247	return nfserr;
4248	/* cinfo */
4249	nfserr = nfsd4_encode_change_info4(xdr, c: &open->op_cinfo);
4250	if (nfserr != nfs_ok)
4251	return nfserr;
4252	/* rflags */
4253	nfserr = nfsd4_encode_uint32_t(xdr, val: open->op_rflags);
4254	if (nfserr != nfs_ok)
4255	return nfserr;
4256	/* attrset */
4257	nfserr = nfsd4_encode_bitmap4(xdr, bmval0: open->op_bmval[0],
4258	bmval1: open->op_bmval[1], bmval2: open->op_bmval[2]);
4259	if (nfserr != nfs_ok)
4260	return nfserr;
4261	/* delegation */
4262	return nfsd4_encode_open_delegation4(xdr, open);
4263	}
4264
4265	static __be32
4266	nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr,
4267	union nfsd4_op_u *u)
4268	{
4269	struct nfsd4_open_confirm *oc = &u->open_confirm;
4270	struct xdr_stream *xdr = resp->xdr;
4271
4272	/* open_stateid */
4273	return nfsd4_encode_stateid4(xdr, sid: &oc->oc_resp_stateid);
4274	}
4275
4276	static __be32
4277	nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr,
4278	union nfsd4_op_u *u)
4279	{
4280	struct nfsd4_open_downgrade *od = &u->open_downgrade;
4281	struct xdr_stream *xdr = resp->xdr;
4282
4283	/* open_stateid */
4284	return nfsd4_encode_stateid4(xdr, sid: &od->od_stateid);
4285	}
4286
4287	/*
4288	* The operation of this function assumes that this is the only
4289	* READ operation in the COMPOUND. If there are multiple READs,
4290	* we use nfsd4_encode_readv().
4291	*/
4292	static __be32 nfsd4_encode_splice_read(
4293	struct nfsd4_compoundres *resp,
4294	struct nfsd4_read *read,
4295	struct file *file, unsigned long maxcount)
4296	{
4297	struct xdr_stream *xdr = resp->xdr;
4298	struct xdr_buf *buf = xdr->buf;
4299	int status, space_left;
4300	__be32 nfserr;
4301
4302	/*
4303	* Make sure there is room at the end of buf->head for
4304	* svcxdr_encode_opaque_pages() to create a tail buffer
4305	* to XDR-pad the payload.
4306	*/
4307	if (xdr->iov != xdr->buf->head || xdr->end - xdr->p < 1)
4308	return nfserr_resource;
4309
4310	nfserr = nfsd_splice_read(rqstp: read->rd_rqstp, fhp: read->rd_fhp,
4311	file, offset: read->rd_offset, count: &maxcount,
4312	eof: &read->rd_eof);
4313	read->rd_length = maxcount;
4314	if (nfserr)
4315	goto out_err;
4316	svcxdr_encode_opaque_pages(rqstp: read->rd_rqstp, xdr, pages: buf->pages,
4317	base: buf->page_base, len: maxcount);
4318	status = svc_encode_result_payload(rqstp: read->rd_rqstp,
4319	offset: buf->head[0].iov_len, length: maxcount);
4320	if (status) {
4321	nfserr = nfserrno(errno: status);
4322	goto out_err;
4323	}
4324
4325	/*
4326	* Prepare to encode subsequent operations.
4327	*
4328	* xdr_truncate_encode() is not safe to use after a successful
4329	* splice read has been done, so the following stream
4330	* manipulations are open-coded.
4331	*/
4332	space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
4333	buf->buflen - buf->len);
4334	buf->buflen = buf->len + space_left;
4335	xdr->end = (__be32 *)((void *)xdr->end + space_left);
4336
4337	return nfs_ok;
4338
4339	out_err:
4340	/*
4341	* nfsd_splice_actor may have already messed with the
4342	* page length; reset it so as not to confuse
4343	* xdr_truncate_encode in our caller.
4344	*/
4345	buf->page_len = 0;
4346	return nfserr;
4347	}
4348
4349	static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
4350	struct nfsd4_read *read,
4351	struct file *file, unsigned long maxcount)
4352	{
4353	struct xdr_stream *xdr = resp->xdr;
4354	unsigned int base = xdr->buf->page_len & ~PAGE_MASK;
4355	unsigned int starting_len = xdr->buf->len;
4356	__be32 zero = xdr_zero;
4357	__be32 nfserr;
4358
4359	if (xdr_reserve_space_vec(xdr, nbytes: maxcount) < 0)
4360	return nfserr_resource;
4361
4362	nfserr = nfsd_iter_read(rqstp: resp->rqstp, fhp: read->rd_fhp, file,
4363	offset: read->rd_offset, count: &maxcount, base,
4364	eof: &read->rd_eof);
4365	read->rd_length = maxcount;
4366	if (nfserr)
4367	return nfserr;
4368	if (svc_encode_result_payload(rqstp: resp->rqstp, offset: starting_len, length: maxcount))
4369	return nfserr_io;
4370	xdr_truncate_encode(xdr, len: starting_len + xdr_align_size(n: maxcount));
4371
4372	write_bytes_to_xdr_buf(xdr->buf, starting_len + maxcount, &zero,
4373	xdr_pad_size(n: maxcount));
4374	return nfs_ok;
4375	}
4376
4377	static __be32
4378	nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
4379	union nfsd4_op_u *u)
4380	{
4381	struct nfsd4_read *read = &u->read;
4382	bool splice_ok = test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags);
4383	unsigned long maxcount;
4384	struct xdr_stream *xdr = resp->xdr;
4385	struct file *file;
4386	int starting_len = xdr->buf->len;
4387	__be32 *p;
4388
4389	if (nfserr)
4390	return nfserr;
4391	file = read->rd_nf->nf_file;
4392
4393	p = xdr_reserve_space(xdr, nbytes: 8); /* eof flag and byte count */
4394	if (!p) {
4395	WARN_ON_ONCE(splice_ok);
4396	return nfserr_resource;
4397	}
4398	if (resp->xdr->buf->page_len && splice_ok) {
4399	WARN_ON_ONCE(1);
4400	return nfserr_serverfault;
4401	}
4402	xdr_commit_encode(xdr);
4403
4404	maxcount = min_t(unsigned long, read->rd_length,
4405	(xdr->buf->buflen - xdr->buf->len));
4406
4407	if (file->f_op->splice_read && splice_ok)
4408	nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
4409	else
4410	nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
4411	if (nfserr) {
4412	xdr_truncate_encode(xdr, len: starting_len);
4413	return nfserr;
4414	}
4415
4416	p = xdr_encode_bool(p, n: read->rd_eof);
4417	*p = cpu_to_be32(read->rd_length);
4418	return nfs_ok;
4419	}
4420
4421	static __be32
4422	nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr,
4423	union nfsd4_op_u *u)
4424	{
4425	struct nfsd4_readlink *readlink = &u->readlink;
4426	__be32 *p, *maxcount_p, zero = xdr_zero;
4427	struct xdr_stream *xdr = resp->xdr;
4428	int length_offset = xdr->buf->len;
4429	int maxcount, status;
4430
4431	maxcount_p = xdr_reserve_space(xdr, XDR_UNIT);
4432	if (!maxcount_p)
4433	return nfserr_resource;
4434	maxcount = PAGE_SIZE;
4435
4436	p = xdr_reserve_space(xdr, nbytes: maxcount);
4437	if (!p)
4438	return nfserr_resource;
4439	/*
4440	* XXX: By default, vfs_readlink() will truncate symlinks if they
4441	* would overflow the buffer. Is this kosher in NFSv4? If not, one
4442	* easy fix is: if vfs_readlink() precisely fills the buffer, assume
4443	* that truncation occurred, and return NFS4ERR_RESOURCE.
4444	*/
4445	nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
4446	(char *)p, &maxcount);
4447	if (nfserr == nfserr_isdir)
4448	nfserr = nfserr_inval;
4449	if (nfserr)
4450	goto out_err;
4451	status = svc_encode_result_payload(rqstp: readlink->rl_rqstp, offset: length_offset,
4452	length: maxcount);
4453	if (status) {
4454	nfserr = nfserrno(errno: status);
4455	goto out_err;
4456	}
4457	*maxcount_p = cpu_to_be32(maxcount);
4458	xdr_truncate_encode(xdr, len: length_offset + 4 + xdr_align_size(n: maxcount));
4459	write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount, &zero,
4460	xdr_pad_size(n: maxcount));
4461	return nfs_ok;
4462
4463	out_err:
4464	xdr_truncate_encode(xdr, len: length_offset);
4465	return nfserr;
4466	}
4467
4468	static __be32 nfsd4_encode_dirlist4(struct xdr_stream *xdr,
4469	struct nfsd4_readdir *readdir,
4470	u32 max_payload)
4471	{
4472	int bytes_left, maxcount, starting_len = xdr->buf->len;
4473	loff_t offset;
4474	__be32 status;
4475
4476	/*
4477	* Number of bytes left for directory entries allowing for the
4478	* final 8 bytes of the readdir and a following failed op.
4479	*/
4480	bytes_left = xdr->buf->buflen - xdr->buf->len -
4481	COMPOUND_ERR_SLACK_SPACE - XDR_UNIT * 2;
4482	if (bytes_left < 0)
4483	return nfserr_resource;
4484	maxcount = min_t(u32, readdir->rd_maxcount, max_payload);
4485
4486	/*
4487	* The RFC defines rd_maxcount as the size of the
4488	* READDIR4resok structure, which includes the verifier
4489	* and the 8 bytes encoded at the end of this function.
4490	*/
4491	if (maxcount < XDR_UNIT * 4)
4492	return nfserr_toosmall;
4493	maxcount = min_t(int, maxcount - XDR_UNIT * 4, bytes_left);
4494
4495	/* RFC 3530 14.2.24 allows us to ignore dircount when it's 0 */
4496	if (!readdir->rd_dircount)
4497	readdir->rd_dircount = max_payload;
4498
4499	/* *entries */
4500	readdir->xdr = xdr;
4501	readdir->rd_maxcount = maxcount;
4502	readdir->common.err = 0;
4503	readdir->cookie_offset = 0;
4504	offset = readdir->rd_cookie;
4505	status = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp, &offset,
4506	&readdir->common, nfsd4_encode_entry4);
4507	if (status)
4508	return status;
4509	if (readdir->common.err == nfserr_toosmall &&
4510	xdr->buf->len == starting_len) {
4511	/* No entries were encoded. Which limit did we hit? */
4512	if (maxcount - XDR_UNIT * 4 < bytes_left)
4513	/* It was the fault of rd_maxcount */
4514	return nfserr_toosmall;
4515	/* We ran out of buffer space */
4516	return nfserr_resource;
4517	}
4518	/* Encode the final entry's cookie value */
4519	nfsd4_encode_entry4_nfs_cookie4(readdir, offset);
4520	/* No entries follow */
4521	if (xdr_stream_encode_item_absent(xdr) != XDR_UNIT)
4522	return nfserr_resource;
4523
4524	/* eof */
4525	return nfsd4_encode_bool(xdr, val: readdir->common.err == nfserr_eof);
4526	}
4527
4528	static __be32
4529	nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr,
4530	union nfsd4_op_u *u)
4531	{
4532	struct nfsd4_readdir *readdir = &u->readdir;
4533	struct xdr_stream *xdr = resp->xdr;
4534	int starting_len = xdr->buf->len;
4535
4536	/* cookieverf */
4537	nfserr = nfsd4_encode_verifier4(xdr, verf: &readdir->rd_verf);
4538	if (nfserr != nfs_ok)
4539	return nfserr;
4540
4541	/* reply */
4542	nfserr = nfsd4_encode_dirlist4(xdr, readdir, max_payload: svc_max_payload(rqstp: resp->rqstp));
4543	if (nfserr != nfs_ok)
4544	xdr_truncate_encode(xdr, len: starting_len);
4545	return nfserr;
4546	}
4547
4548	static __be32
4549	nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr,
4550	union nfsd4_op_u *u)
4551	{
4552	struct nfsd4_remove *remove = &u->remove;
4553	struct xdr_stream *xdr = resp->xdr;
4554
4555	return nfsd4_encode_change_info4(xdr, c: &remove->rm_cinfo);
4556	}
4557
4558	static __be32
4559	nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr,
4560	union nfsd4_op_u *u)
4561	{
4562	struct nfsd4_rename *rename = &u->rename;
4563	struct xdr_stream *xdr = resp->xdr;
4564
4565	nfserr = nfsd4_encode_change_info4(xdr, c: &rename->rn_sinfo);
4566	if (nfserr)
4567	return nfserr;
4568	return nfsd4_encode_change_info4(xdr, c: &rename->rn_tinfo);
4569	}
4570
4571	static __be32
4572	nfsd4_encode_rpcsec_gss_info(struct xdr_stream *xdr,
4573	struct rpcsec_gss_info *info)
4574	{
4575	__be32 status;
4576
4577	/* oid */
4578	if (xdr_stream_encode_opaque(xdr, ptr: info->oid.data, len: info->oid.len) < 0)
4579	return nfserr_resource;
4580	/* qop */
4581	status = nfsd4_encode_qop4(xdr, info->qop);
4582	if (status != nfs_ok)
4583	return status;
4584	/* service */
4585	if (xdr_stream_encode_u32(xdr, n: info->service) != XDR_UNIT)
4586	return nfserr_resource;
4587
4588	return nfs_ok;
4589	}
4590
4591	static __be32
4592	nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp)
4593	{
4594	u32 i, nflavs, supported;
4595	struct exp_flavor_info *flavs;
4596	struct exp_flavor_info def_flavs[2];
4597	static bool report = true;
4598	__be32 *flavorsp;
4599	__be32 status;
4600
4601	if (exp->ex_nflavors) {
4602	flavs = exp->ex_flavors;
4603	nflavs = exp->ex_nflavors;
4604	} else { /* Handling of some defaults in absence of real secinfo: */
4605	flavs = def_flavs;
4606	if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
4607	nflavs = 2;
4608	flavs[0].pseudoflavor = RPC_AUTH_UNIX;
4609	flavs[1].pseudoflavor = RPC_AUTH_NULL;
4610	} else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
4611	nflavs = 1;
4612	flavs[0].pseudoflavor
4613	= svcauth_gss_flavor(dom: exp->ex_client);
4614	} else {
4615	nflavs = 1;
4616	flavs[0].pseudoflavor
4617	= exp->ex_client->flavour->flavour;
4618	}
4619	}
4620
4621	supported = 0;
4622	flavorsp = xdr_reserve_space(xdr, XDR_UNIT);
4623	if (!flavorsp)
4624	return nfserr_resource;
4625
4626	for (i = 0; i < nflavs; i++) {
4627	rpc_authflavor_t pf = flavs[i].pseudoflavor;
4628	struct rpcsec_gss_info info;
4629
4630	if (rpcauth_get_gssinfo(pf, &info) == 0) {
4631	supported++;
4632
4633	/* flavor */
4634	status = nfsd4_encode_uint32_t(xdr, val: RPC_AUTH_GSS);
4635	if (status != nfs_ok)
4636	return status;
4637	/* flavor_info */
4638	status = nfsd4_encode_rpcsec_gss_info(xdr, info: &info);
4639	if (status != nfs_ok)
4640	return status;
4641	} else if (pf < RPC_AUTH_MAXFLAVOR) {
4642	supported++;
4643
4644	/* flavor */
4645	status = nfsd4_encode_uint32_t(xdr, val: pf);
4646	if (status != nfs_ok)
4647	return status;
4648	} else {
4649	if (report)
4650	pr_warn("NFS: SECINFO: security flavor %u "
4651	"is not supported\n", pf);
4652	}
4653	}
4654
4655	if (nflavs != supported)
4656	report = false;
4657	*flavorsp = cpu_to_be32(supported);
4658	return 0;
4659	}
4660
4661	static __be32
4662	nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4663	union nfsd4_op_u *u)
4664	{
4665	struct nfsd4_secinfo *secinfo = &u->secinfo;
4666	struct xdr_stream *xdr = resp->xdr;
4667
4668	return nfsd4_do_encode_secinfo(xdr, exp: secinfo->si_exp);
4669	}
4670
4671	static __be32
4672	nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
4673	union nfsd4_op_u *u)
4674	{
4675	struct nfsd4_secinfo_no_name *secinfo = &u->secinfo_no_name;
4676	struct xdr_stream *xdr = resp->xdr;
4677
4678	return nfsd4_do_encode_secinfo(xdr, exp: secinfo->sin_exp);
4679	}
4680
4681	static __be32
4682	nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr,
4683	union nfsd4_op_u *u)
4684	{
4685	struct nfsd4_setattr *setattr = &u->setattr;
4686	__be32 status;
4687
4688	switch (nfserr) {
4689	case nfs_ok:
4690	/* attrsset */
4691	status = nfsd4_encode_bitmap4(xdr: resp->xdr, bmval0: setattr->sa_bmval[0],
4692	bmval1: setattr->sa_bmval[1],
4693	bmval2: setattr->sa_bmval[2]);
4694	break;
4695	default:
4696	/* attrsset */
4697	status = nfsd4_encode_bitmap4(xdr: resp->xdr, bmval0: 0, bmval1: 0, bmval2: 0);
4698	}
4699	return status != nfs_ok ? status : nfserr;
4700	}
4701
4702	static __be32
4703	nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr,
4704	union nfsd4_op_u *u)
4705	{
4706	struct nfsd4_setclientid *scd = &u->setclientid;
4707	struct xdr_stream *xdr = resp->xdr;
4708
4709	if (!nfserr) {
4710	nfserr = nfsd4_encode_clientid4(xdr, clientid: &scd->se_clientid);
4711	if (nfserr != nfs_ok)
4712	goto out;
4713	nfserr = nfsd4_encode_verifier4(xdr, verf: &scd->se_confirm);
4714	} else if (nfserr == nfserr_clid_inuse) {
4715	/* empty network id */
4716	if (xdr_stream_encode_u32(xdr, n: 0) < 0) {
4717	nfserr = nfserr_resource;
4718	goto out;
4719	}
4720	/* empty universal address */
4721	if (xdr_stream_encode_u32(xdr, n: 0) < 0) {
4722	nfserr = nfserr_resource;
4723	goto out;
4724	}
4725	}
4726	out:
4727	return nfserr;
4728	}
4729
4730	static __be32
4731	nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr,
4732	union nfsd4_op_u *u)
4733	{
4734	struct nfsd4_write *write = &u->write;
4735	struct xdr_stream *xdr = resp->xdr;
4736
4737	/* count */
4738	nfserr = nfsd4_encode_count4(xdr, write->wr_bytes_written);
4739	if (nfserr)
4740	return nfserr;
4741	/* committed */
4742	if (xdr_stream_encode_u32(xdr, n: write->wr_how_written) != XDR_UNIT)
4743	return nfserr_resource;
4744	/* writeverf */
4745	return nfsd4_encode_verifier4(xdr, verf: &write->wr_verifier);
4746	}
4747
4748	static __be32
4749	nfsd4_encode_state_protect_ops4(struct xdr_stream *xdr,
4750	struct nfsd4_exchange_id *exid)
4751	{
4752	__be32 status;
4753
4754	/* spo_must_enforce */
4755	status = nfsd4_encode_bitmap4(xdr, bmval0: exid->spo_must_enforce[0],
4756	bmval1: exid->spo_must_enforce[1],
4757	bmval2: exid->spo_must_enforce[2]);
4758	if (status != nfs_ok)
4759	return status;
4760	/* spo_must_allow */
4761	return nfsd4_encode_bitmap4(xdr, bmval0: exid->spo_must_allow[0],
4762	bmval1: exid->spo_must_allow[1],
4763	bmval2: exid->spo_must_allow[2]);
4764	}
4765
4766	static __be32
4767	nfsd4_encode_state_protect4_r(struct xdr_stream *xdr, struct nfsd4_exchange_id *exid)
4768	{
4769	__be32 status;
4770
4771	if (xdr_stream_encode_u32(xdr, n: exid->spa_how) != XDR_UNIT)
4772	return nfserr_resource;
4773	switch (exid->spa_how) {
4774	case SP4_NONE:
4775	status = nfs_ok;
4776	break;
4777	case SP4_MACH_CRED:
4778	/* spr_mach_ops */
4779	status = nfsd4_encode_state_protect_ops4(xdr, exid);
4780	break;
4781	default:
4782	status = nfserr_serverfault;
4783	}
4784	return status;
4785	}
4786
4787	static __be32
4788	nfsd4_encode_server_owner4(struct xdr_stream *xdr, struct svc_rqst *rqstp)
4789	{
4790	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), id: nfsd_net_id);
4791	__be32 status;
4792
4793	/* so_minor_id */
4794	status = nfsd4_encode_uint64_t(xdr, val: 0);
4795	if (status != nfs_ok)
4796	return status;
4797	/* so_major_id */
4798	return nfsd4_encode_opaque(xdr, data: nn->nfsd_name, strlen(nn->nfsd_name));
4799	}
4800
4801	static __be32
4802	nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
4803	union nfsd4_op_u *u)
4804	{
4805	struct nfsd_net *nn = net_generic(SVC_NET(resp->rqstp), id: nfsd_net_id);
4806	struct nfsd4_exchange_id *exid = &u->exchange_id;
4807	struct xdr_stream *xdr = resp->xdr;
4808
4809	/* eir_clientid */
4810	nfserr = nfsd4_encode_clientid4(xdr, clientid: &exid->clientid);
4811	if (nfserr != nfs_ok)
4812	return nfserr;
4813	/* eir_sequenceid */
4814	nfserr = nfsd4_encode_sequenceid4(xdr, exid->seqid);
4815	if (nfserr != nfs_ok)
4816	return nfserr;
4817	/* eir_flags */
4818	nfserr = nfsd4_encode_uint32_t(xdr, val: exid->flags);
4819	if (nfserr != nfs_ok)
4820	return nfserr;
4821	/* eir_state_protect */
4822	nfserr = nfsd4_encode_state_protect4_r(xdr, exid);
4823	if (nfserr != nfs_ok)
4824	return nfserr;
4825	/* eir_server_owner */
4826	nfserr = nfsd4_encode_server_owner4(xdr, rqstp: resp->rqstp);
4827	if (nfserr != nfs_ok)
4828	return nfserr;
4829	/* eir_server_scope */
4830	nfserr = nfsd4_encode_opaque(xdr, data: nn->nfsd_name,
4831	strlen(nn->nfsd_name));
4832	if (nfserr != nfs_ok)
4833	return nfserr;
4834	/* eir_server_impl_id<1> */
4835	if (xdr_stream_encode_u32(xdr, n: 0) != XDR_UNIT)
4836	return nfserr_resource;
4837
4838	return nfs_ok;
4839	}
4840
4841	static __be32
4842	nfsd4_encode_channel_attrs4(struct xdr_stream *xdr,
4843	const struct nfsd4_channel_attrs *attrs)
4844	{
4845	__be32 status;
4846
4847	/* ca_headerpadsize */
4848	status = nfsd4_encode_count4(xdr, 0);
4849	if (status != nfs_ok)
4850	return status;
4851	/* ca_maxrequestsize */
4852	status = nfsd4_encode_count4(xdr, attrs->maxreq_sz);
4853	if (status != nfs_ok)
4854	return status;
4855	/* ca_maxresponsesize */
4856	status = nfsd4_encode_count4(xdr, attrs->maxresp_sz);
4857	if (status != nfs_ok)
4858	return status;
4859	/* ca_maxresponsesize_cached */
4860	status = nfsd4_encode_count4(xdr, attrs->maxresp_cached);
4861	if (status != nfs_ok)
4862	return status;
4863	/* ca_maxoperations */
4864	status = nfsd4_encode_count4(xdr, attrs->maxops);
4865	if (status != nfs_ok)
4866	return status;
4867	/* ca_maxrequests */
4868	status = nfsd4_encode_count4(xdr, attrs->maxreqs);
4869	if (status != nfs_ok)
4870	return status;
4871	/* ca_rdma_ird<1> */
4872	if (xdr_stream_encode_u32(xdr, n: attrs->nr_rdma_attrs) != XDR_UNIT)
4873	return nfserr_resource;
4874	if (attrs->nr_rdma_attrs)
4875	return nfsd4_encode_uint32_t(xdr, val: attrs->rdma_attrs);
4876	return nfs_ok;
4877	}
4878
4879	static __be32
4880	nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
4881	union nfsd4_op_u *u)
4882	{
4883	struct nfsd4_create_session *sess = &u->create_session;
4884	struct xdr_stream *xdr = resp->xdr;
4885
4886	/* csr_sessionid */
4887	nfserr = nfsd4_encode_sessionid4(xdr, sessionid: &sess->sessionid);
4888	if (nfserr != nfs_ok)
4889	return nfserr;
4890	/* csr_sequence */
4891	nfserr = nfsd4_encode_sequenceid4(xdr, sess->seqid);
4892	if (nfserr != nfs_ok)
4893	return nfserr;
4894	/* csr_flags */
4895	nfserr = nfsd4_encode_uint32_t(xdr, val: sess->flags);
4896	if (nfserr != nfs_ok)
4897	return nfserr;
4898	/* csr_fore_chan_attrs */
4899	nfserr = nfsd4_encode_channel_attrs4(xdr, attrs: &sess->fore_channel);
4900	if (nfserr != nfs_ok)
4901	return nfserr;
4902	/* csr_back_chan_attrs */
4903	return nfsd4_encode_channel_attrs4(xdr, attrs: &sess->back_channel);
4904	}
4905
4906	static __be32
4907	nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4908	union nfsd4_op_u *u)
4909	{
4910	struct nfsd4_sequence *seq = &u->sequence;
4911	struct xdr_stream *xdr = resp->xdr;
4912
4913	/* sr_sessionid */
4914	nfserr = nfsd4_encode_sessionid4(xdr, sessionid: &seq->sessionid);
4915	if (nfserr != nfs_ok)
4916	return nfserr;
4917	/* sr_sequenceid */
4918	nfserr = nfsd4_encode_sequenceid4(xdr, seq->seqid);
4919	if (nfserr != nfs_ok)
4920	return nfserr;
4921	/* sr_slotid */
4922	nfserr = nfsd4_encode_slotid4(xdr, seq->slotid);
4923	if (nfserr != nfs_ok)
4924	return nfserr;
4925	/* Note slotid's are numbered from zero: */
4926	/* sr_highest_slotid */
4927	nfserr = nfsd4_encode_slotid4(xdr, seq->maxslots - 1);
4928	if (nfserr != nfs_ok)
4929	return nfserr;
4930	/* sr_target_highest_slotid */
4931	nfserr = nfsd4_encode_slotid4(xdr, seq->maxslots - 1);
4932	if (nfserr != nfs_ok)
4933	return nfserr;
4934	/* sr_status_flags */
4935	nfserr = nfsd4_encode_uint32_t(xdr, val: seq->status_flags);
4936	if (nfserr != nfs_ok)
4937	return nfserr;
4938
4939	resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4940	return nfs_ok;
4941	}
4942
4943	static __be32
4944	nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4945	union nfsd4_op_u *u)
4946	{
4947	struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
4948	struct nfsd4_test_stateid_id *stateid, *next;
4949	struct xdr_stream *xdr = resp->xdr;
4950
4951	/* tsr_status_codes<> */
4952	if (xdr_stream_encode_u32(xdr, n: test_stateid->ts_num_ids) != XDR_UNIT)
4953	return nfserr_resource;
4954	list_for_each_entry_safe(stateid, next,
4955	&test_stateid->ts_stateid_list, ts_id_list) {
4956	if (xdr_stream_encode_be32(xdr, n: stateid->ts_id_status) != XDR_UNIT)
4957	return nfserr_resource;
4958	}
4959	return nfs_ok;
4960	}
4961
4962	#ifdef CONFIG_NFSD_PNFS
4963	static __be32
4964	nfsd4_encode_device_addr4(struct xdr_stream *xdr,
4965	const struct nfsd4_getdeviceinfo *gdev)
4966	{
4967	u32 needed_len, starting_len = xdr->buf->len;
4968	const struct nfsd4_layout_ops *ops;
4969	__be32 status;
4970
4971	/* da_layout_type */
4972	if (xdr_stream_encode_u32(xdr, n: gdev->gd_layout_type) != XDR_UNIT)
4973	return nfserr_resource;
4974	/* da_addr_body */
4975	ops = nfsd4_layout_ops[gdev->gd_layout_type];
4976	status = ops->encode_getdeviceinfo(xdr, gdev);
4977	if (status != nfs_ok) {
4978	/*
4979	* Don't burden the layout drivers with enforcing
4980	* gd_maxcount. Just tell the client to come back
4981	* with a bigger buffer if it's not enough.
4982	*/
4983	if (xdr->buf->len + XDR_UNIT > gdev->gd_maxcount)
4984	goto toosmall;
4985	return status;
4986	}
4987
4988	return nfs_ok;
4989
4990	toosmall:
4991	needed_len = xdr->buf->len + XDR_UNIT; /* notifications */
4992	xdr_truncate_encode(xdr, len: starting_len);
4993
4994	status = nfsd4_encode_count4(xdr, needed_len);
4995	if (status != nfs_ok)
4996	return status;
4997	return nfserr_toosmall;
4998	}
4999
5000	static __be32
5001	nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
5002	union nfsd4_op_u *u)
5003	{
5004	struct nfsd4_getdeviceinfo *gdev = &u->getdeviceinfo;
5005	struct xdr_stream *xdr = resp->xdr;
5006
5007	/* gdir_device_addr */
5008	nfserr = nfsd4_encode_device_addr4(xdr, gdev);
5009	if (nfserr)
5010	return nfserr;
5011	/* gdir_notification */
5012	return nfsd4_encode_bitmap4(xdr, bmval0: gdev->gd_notify_types, bmval1: 0, bmval2: 0);
5013	}
5014
5015	static __be32
5016	nfsd4_encode_layout4(struct xdr_stream *xdr, const struct nfsd4_layoutget *lgp)
5017	{
5018	const struct nfsd4_layout_ops *ops = nfsd4_layout_ops[lgp->lg_layout_type];
5019	__be32 status;
5020
5021	/* lo_offset */
5022	status = nfsd4_encode_offset4(xdr, lgp->lg_seg.offset);
5023	if (status != nfs_ok)
5024	return status;
5025	/* lo_length */
5026	status = nfsd4_encode_length4(xdr, lgp->lg_seg.length);
5027	if (status != nfs_ok)
5028	return status;
5029	/* lo_iomode */
5030	if (xdr_stream_encode_u32(xdr, n: lgp->lg_seg.iomode) != XDR_UNIT)
5031	return nfserr_resource;
5032	/* lo_content */
5033	if (xdr_stream_encode_u32(xdr, n: lgp->lg_layout_type) != XDR_UNIT)
5034	return nfserr_resource;
5035	return ops->encode_layoutget(xdr, lgp);
5036	}
5037
5038	static __be32
5039	nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
5040	union nfsd4_op_u *u)
5041	{
5042	struct nfsd4_layoutget *lgp = &u->layoutget;
5043	struct xdr_stream *xdr = resp->xdr;
5044
5045	/* logr_return_on_close */
5046	nfserr = nfsd4_encode_bool(xdr, val: true);
5047	if (nfserr != nfs_ok)
5048	return nfserr;
5049	/* logr_stateid */
5050	nfserr = nfsd4_encode_stateid4(xdr, sid: &lgp->lg_sid);
5051	if (nfserr != nfs_ok)
5052	return nfserr;
5053	/* logr_layout<> */
5054	if (xdr_stream_encode_u32(xdr, n: 1) != XDR_UNIT)
5055	return nfserr_resource;
5056	return nfsd4_encode_layout4(xdr, lgp);
5057	}
5058
5059	static __be32
5060	nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
5061	union nfsd4_op_u *u)
5062	{
5063	struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
5064	struct xdr_stream *xdr = resp->xdr;
5065
5066	/* ns_sizechanged */
5067	nfserr = nfsd4_encode_bool(xdr, val: lcp->lc_size_chg);
5068	if (nfserr != nfs_ok)
5069	return nfserr;
5070	if (lcp->lc_size_chg)
5071	/* ns_size */
5072	return nfsd4_encode_length4(xdr, lcp->lc_newsize);
5073	return nfs_ok;
5074	}
5075
5076	static __be32
5077	nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
5078	union nfsd4_op_u *u)
5079	{
5080	struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
5081	struct xdr_stream *xdr = resp->xdr;
5082
5083	/* lrs_present */
5084	nfserr = nfsd4_encode_bool(xdr, val: lrp->lrs_present);
5085	if (nfserr != nfs_ok)
5086	return nfserr;
5087	if (lrp->lrs_present)
5088	/* lrs_stateid */
5089	return nfsd4_encode_stateid4(xdr, sid: &lrp->lr_sid);
5090	return nfs_ok;
5091	}
5092	#endif /* CONFIG_NFSD_PNFS */
5093
5094	static __be32
5095	nfsd4_encode_write_response4(struct xdr_stream *xdr,
5096	const struct nfsd4_copy *copy)
5097	{
5098	const struct nfsd42_write_res *write = &copy->cp_res;
5099	u32 count = nfsd4_copy_is_sync(copy) ? 0 : 1;
5100	__be32 status;
5101
5102	/* wr_callback_id<1> */
5103	if (xdr_stream_encode_u32(xdr, n: count) != XDR_UNIT)
5104	return nfserr_resource;
5105	if (count) {
5106	status = nfsd4_encode_stateid4(xdr, sid: &write->cb_stateid);
5107	if (status != nfs_ok)
5108	return status;
5109	}
5110
5111	/* wr_count */
5112	status = nfsd4_encode_length4(xdr, write->wr_bytes_written);
5113	if (status != nfs_ok)
5114	return status;
5115	/* wr_committed */
5116	if (xdr_stream_encode_u32(xdr, n: write->wr_stable_how) != XDR_UNIT)
5117	return nfserr_resource;
5118	/* wr_writeverf */
5119	return nfsd4_encode_verifier4(xdr, verf: &write->wr_verifier);
5120	}
5121
5122	static __be32 nfsd4_encode_copy_requirements4(struct xdr_stream *xdr,
5123	const struct nfsd4_copy *copy)
5124	{
5125	__be32 status;
5126
5127	/* cr_consecutive */
5128	status = nfsd4_encode_bool(xdr, val: true);
5129	if (status != nfs_ok)
5130	return status;
5131	/* cr_synchronous */
5132	return nfsd4_encode_bool(xdr, val: nfsd4_copy_is_sync(copy));
5133	}
5134
5135	static __be32
5136	nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
5137	union nfsd4_op_u *u)
5138	{
5139	struct nfsd4_copy *copy = &u->copy;
5140
5141	nfserr = nfsd4_encode_write_response4(xdr: resp->xdr, copy);
5142	if (nfserr != nfs_ok)
5143	return nfserr;
5144	return nfsd4_encode_copy_requirements4(xdr: resp->xdr, copy);
5145	}
5146
5147	static __be32
5148	nfsd4_encode_netloc4(struct xdr_stream *xdr, const struct nl4_server *ns)
5149	{
5150	__be32 status;
5151
5152	if (xdr_stream_encode_u32(xdr, n: ns->nl4_type) != XDR_UNIT)
5153	return nfserr_resource;
5154	switch (ns->nl4_type) {
5155	case NL4_NETADDR:
5156	/* nl_addr */
5157	status = nfsd4_encode_netaddr4(xdr, addr: &ns->u.nl4_addr);
5158	break;
5159	default:
5160	status = nfserr_serverfault;
5161	}
5162	return status;
5163	}
5164
5165	static __be32
5166	nfsd4_encode_copy_notify(struct nfsd4_compoundres *resp, __be32 nfserr,
5167	union nfsd4_op_u *u)
5168	{
5169	struct nfsd4_copy_notify *cn = &u->copy_notify;
5170	struct xdr_stream *xdr = resp->xdr;
5171
5172	/* cnr_lease_time */
5173	nfserr = nfsd4_encode_nfstime4(xdr, tv: &cn->cpn_lease_time);
5174	if (nfserr)
5175	return nfserr;
5176	/* cnr_stateid */
5177	nfserr = nfsd4_encode_stateid4(xdr, sid: &cn->cpn_cnr_stateid);
5178	if (nfserr)
5179	return nfserr;
5180	/* cnr_source_server<> */
5181	if (xdr_stream_encode_u32(xdr, n: 1) != XDR_UNIT)
5182	return nfserr_resource;
5183	return nfsd4_encode_netloc4(xdr, ns: cn->cpn_src);
5184	}
5185
5186	static __be32
5187	nfsd4_encode_offload_status(struct nfsd4_compoundres *resp, __be32 nfserr,
5188	union nfsd4_op_u *u)
5189	{
5190	struct nfsd4_offload_status *os = &u->offload_status;
5191	struct xdr_stream *xdr = resp->xdr;
5192
5193	/* osr_count */
5194	nfserr = nfsd4_encode_length4(xdr, os->count);
5195	if (nfserr != nfs_ok)
5196	return nfserr;
5197	/* osr_complete<1> */
5198	if (xdr_stream_encode_u32(xdr, n: 0) != XDR_UNIT)
5199	return nfserr_resource;
5200	return nfs_ok;
5201	}
5202
5203	static __be32
5204	nfsd4_encode_read_plus_data(struct nfsd4_compoundres *resp,
5205	struct nfsd4_read *read)
5206	{
5207	bool splice_ok = test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags);
5208	struct file *file = read->rd_nf->nf_file;
5209	struct xdr_stream *xdr = resp->xdr;
5210	unsigned long maxcount;
5211	__be32 nfserr, *p;
5212
5213	/* Content type, offset, byte count */
5214	p = xdr_reserve_space(xdr, nbytes: 4 + 8 + 4);
5215	if (!p)
5216	return nfserr_io;
5217	if (resp->xdr->buf->page_len && splice_ok) {
5218	WARN_ON_ONCE(splice_ok);
5219	return nfserr_serverfault;
5220	}
5221
5222	maxcount = min_t(unsigned long, read->rd_length,
5223	(xdr->buf->buflen - xdr->buf->len));
5224
5225	if (file->f_op->splice_read && splice_ok)
5226	nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
5227	else
5228	nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
5229	if (nfserr)
5230	return nfserr;
5231
5232	*p++ = cpu_to_be32(NFS4_CONTENT_DATA);
5233	p = xdr_encode_hyper(p, val: read->rd_offset);
5234	*p = cpu_to_be32(read->rd_length);
5235
5236	return nfs_ok;
5237	}
5238
5239	static __be32
5240	nfsd4_encode_read_plus(struct nfsd4_compoundres *resp, __be32 nfserr,
5241	union nfsd4_op_u *u)
5242	{
5243	struct nfsd4_read *read = &u->read;
5244	struct file *file = read->rd_nf->nf_file;
5245	struct xdr_stream *xdr = resp->xdr;
5246	int starting_len = xdr->buf->len;
5247	u32 segments = 0;
5248	__be32 *p;
5249
5250	if (nfserr)
5251	return nfserr;
5252
5253	/* eof flag, segment count */
5254	p = xdr_reserve_space(xdr, nbytes: 4 + 4);
5255	if (!p)
5256	return nfserr_io;
5257	xdr_commit_encode(xdr);
5258
5259	read->rd_eof = read->rd_offset >= i_size_read(inode: file_inode(f: file));
5260	if (read->rd_eof)
5261	goto out;
5262
5263	nfserr = nfsd4_encode_read_plus_data(resp, read);
5264	if (nfserr) {
5265	xdr_truncate_encode(xdr, len: starting_len);
5266	return nfserr;
5267	}
5268
5269	segments++;
5270
5271	out:
5272	p = xdr_encode_bool(p, n: read->rd_eof);
5273	*p = cpu_to_be32(segments);
5274	return nfserr;
5275	}
5276
5277	static __be32
5278	nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
5279	union nfsd4_op_u *u)
5280	{
5281	struct nfsd4_seek *seek = &u->seek;
5282	struct xdr_stream *xdr = resp->xdr;
5283
5284	/* sr_eof */
5285	nfserr = nfsd4_encode_bool(xdr, val: seek->seek_eof);
5286	if (nfserr != nfs_ok)
5287	return nfserr;
5288	/* sr_offset */
5289	return nfsd4_encode_offset4(xdr, seek->seek_pos);
5290	}
5291
5292	static __be32
5293	nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr,
5294	union nfsd4_op_u *p)
5295	{
5296	return nfserr;
5297	}
5298
5299	/*
5300	* Encode kmalloc-ed buffer in to XDR stream.
5301	*/
5302	static __be32
5303	nfsd4_vbuf_to_stream(struct xdr_stream *xdr, char *buf, u32 buflen)
5304	{
5305	u32 cplen;
5306	__be32 *p;
5307
5308	cplen = min_t(unsigned long, buflen,
5309	((void *)xdr->end - (void *)xdr->p));
5310	p = xdr_reserve_space(xdr, nbytes: cplen);
5311	if (!p)
5312	return nfserr_resource;
5313
5314	memcpy(p, buf, cplen);
5315	buf += cplen;
5316	buflen -= cplen;
5317
5318	while (buflen) {
5319	cplen = min_t(u32, buflen, PAGE_SIZE);
5320	p = xdr_reserve_space(xdr, nbytes: cplen);
5321	if (!p)
5322	return nfserr_resource;
5323
5324	memcpy(p, buf, cplen);
5325
5326	if (cplen < PAGE_SIZE) {
5327	/*
5328	* We're done, with a length that wasn't page
5329	* aligned, so possibly not word aligned. Pad
5330	* any trailing bytes with 0.
5331	*/
5332	xdr_encode_opaque_fixed(p, NULL, len: cplen);
5333	break;
5334	}
5335
5336	buflen -= PAGE_SIZE;
5337	buf += PAGE_SIZE;
5338	}
5339
5340	return 0;
5341	}
5342
5343	static __be32
5344	nfsd4_encode_getxattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5345	union nfsd4_op_u *u)
5346	{
5347	struct nfsd4_getxattr *getxattr = &u->getxattr;
5348	struct xdr_stream *xdr = resp->xdr;
5349	__be32 *p, err;
5350
5351	p = xdr_reserve_space(xdr, nbytes: 4);
5352	if (!p)
5353	return nfserr_resource;
5354
5355	*p = cpu_to_be32(getxattr->getxa_len);
5356
5357	if (getxattr->getxa_len == 0)
5358	return 0;
5359
5360	err = nfsd4_vbuf_to_stream(xdr, buf: getxattr->getxa_buf,
5361	buflen: getxattr->getxa_len);
5362
5363	kvfree(addr: getxattr->getxa_buf);
5364
5365	return err;
5366	}
5367
5368	static __be32
5369	nfsd4_encode_setxattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5370	union nfsd4_op_u *u)
5371	{
5372	struct nfsd4_setxattr *setxattr = &u->setxattr;
5373	struct xdr_stream *xdr = resp->xdr;
5374
5375	return nfsd4_encode_change_info4(xdr, c: &setxattr->setxa_cinfo);
5376	}
5377
5378	/*
5379	* See if there are cookie values that can be rejected outright.
5380	*/
5381	static __be32
5382	nfsd4_listxattr_validate_cookie(struct nfsd4_listxattrs *listxattrs,
5383	u32 *offsetp)
5384	{
5385	u64 cookie = listxattrs->lsxa_cookie;
5386
5387	/*
5388	* If the cookie is larger than the maximum number we can fit
5389	* in either the buffer we just got back from vfs_listxattr, or,
5390	* XDR-encoded, in the return buffer, it's invalid.
5391	*/
5392	if (cookie > (listxattrs->lsxa_len) / (XATTR_USER_PREFIX_LEN + 2))
5393	return nfserr_badcookie;
5394
5395	if (cookie > (listxattrs->lsxa_maxcount /
5396	(XDR_QUADLEN(XATTR_USER_PREFIX_LEN + 2) + 4)))
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	__be32 *p;
5416	u32 nuser;
5417
5418	eof = 1;
5419
5420	status = nfsd4_listxattr_validate_cookie(listxattrs, offsetp: &offset);
5421	if (status)
5422	goto out;
5423
5424	/*
5425	* Reserve space for the cookie and the name array count. Record
5426	* the offsets to save them later.
5427	*/
5428	cookie_offset = xdr->buf->len;
5429	count_offset = cookie_offset + 8;
5430	p = xdr_reserve_space(xdr, nbytes: 12);
5431	if (!p) {
5432	status = nfserr_resource;
5433	goto out;
5434	}
5435
5436	count = 0;
5437	left = listxattrs->lsxa_len;
5438	sp = listxattrs->lsxa_buf;
5439	nuser = 0;
5440
5441	xdrleft = listxattrs->lsxa_maxcount;
5442
5443	while (left > 0 && xdrleft > 0) {
5444	slen = strlen(sp);
5445
5446	/*
5447	* Check if this is a "user." attribute, skip it if not.
5448	*/
5449	if (strncmp(sp, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN))
5450	goto contloop;
5451
5452	slen -= XATTR_USER_PREFIX_LEN;
5453	xdrlen = 4 + ((slen + 3) & ~3);
5454	if (xdrlen > xdrleft) {
5455	if (count == 0) {
5456	/*
5457	* Can't even fit the first attribute name.
5458	*/
5459	status = nfserr_toosmall;
5460	goto out;
5461	}
5462	eof = 0;
5463	goto wreof;
5464	}
5465
5466	left -= XATTR_USER_PREFIX_LEN;
5467	sp += XATTR_USER_PREFIX_LEN;
5468	if (nuser++ < offset)
5469	goto contloop;
5470
5471
5472	p = xdr_reserve_space(xdr, nbytes: xdrlen);
5473	if (!p) {
5474	status = nfserr_resource;
5475	goto out;
5476	}
5477
5478	xdr_encode_opaque(p, ptr: sp, len: slen);
5479
5480	xdrleft -= xdrlen;
5481	count++;
5482	contloop:
5483	sp += slen + 1;
5484	left -= slen + 1;
5485	}
5486
5487	/*
5488	* If there were user attributes to copy, but we didn't copy
5489	* any, the offset was too large (e.g. the cookie was invalid).
5490	*/
5491	if (nuser > 0 && count == 0) {
5492	status = nfserr_badcookie;
5493	goto out;
5494	}
5495
5496	wreof:
5497	p = xdr_reserve_space(xdr, nbytes: 4);
5498	if (!p) {
5499	status = nfserr_resource;
5500	goto out;
5501	}
5502	*p = cpu_to_be32(eof);
5503
5504	cookie = offset + count;
5505
5506	write_bytes_to_xdr_buf(xdr->buf, cookie_offset, &cookie, 8);
5507	tmp = cpu_to_be32(count);
5508	write_bytes_to_xdr_buf(xdr->buf, count_offset, &tmp, 4);
5509	out:
5510	if (listxattrs->lsxa_len)
5511	kvfree(addr: listxattrs->lsxa_buf);
5512	return status;
5513	}
5514
5515	static __be32
5516	nfsd4_encode_removexattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5517	union nfsd4_op_u *u)
5518	{
5519	struct nfsd4_removexattr *removexattr = &u->removexattr;
5520	struct xdr_stream *xdr = resp->xdr;
5521
5522	return nfsd4_encode_change_info4(xdr, c: &removexattr->rmxa_cinfo);
5523	}
5524
5525	typedef __be32(*nfsd4_enc)(struct nfsd4_compoundres *, __be32, union nfsd4_op_u *u);
5526
5527	/*
5528	* Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
5529	* since we don't need to filter out obsolete ops as this is
5530	* done in the decoding phase.
5531	*/
5532	static const nfsd4_enc nfsd4_enc_ops[] = {
5533	[OP_ACCESS] = nfsd4_encode_access,
5534	[OP_CLOSE] = nfsd4_encode_close,
5535	[OP_COMMIT] = nfsd4_encode_commit,
5536	[OP_CREATE] = nfsd4_encode_create,
5537	[OP_DELEGPURGE] = nfsd4_encode_noop,
5538	[OP_DELEGRETURN] = nfsd4_encode_noop,
5539	[OP_GETATTR] = nfsd4_encode_getattr,
5540	[OP_GETFH] = nfsd4_encode_getfh,
5541	[OP_LINK] = nfsd4_encode_link,
5542	[OP_LOCK] = nfsd4_encode_lock,
5543	[OP_LOCKT] = nfsd4_encode_lockt,
5544	[OP_LOCKU] = nfsd4_encode_locku,
5545	[OP_LOOKUP] = nfsd4_encode_noop,
5546	[OP_LOOKUPP] = nfsd4_encode_noop,
5547	[OP_NVERIFY] = nfsd4_encode_noop,
5548	[OP_OPEN] = nfsd4_encode_open,
5549	[OP_OPENATTR] = nfsd4_encode_noop,
5550	[OP_OPEN_CONFIRM] = nfsd4_encode_open_confirm,
5551	[OP_OPEN_DOWNGRADE] = nfsd4_encode_open_downgrade,
5552	[OP_PUTFH] = nfsd4_encode_noop,
5553	[OP_PUTPUBFH] = nfsd4_encode_noop,
5554	[OP_PUTROOTFH] = nfsd4_encode_noop,
5555	[OP_READ] = nfsd4_encode_read,
5556	[OP_READDIR] = nfsd4_encode_readdir,
5557	[OP_READLINK] = nfsd4_encode_readlink,
5558	[OP_REMOVE] = nfsd4_encode_remove,
5559	[OP_RENAME] = nfsd4_encode_rename,
5560	[OP_RENEW] = nfsd4_encode_noop,
5561	[OP_RESTOREFH] = nfsd4_encode_noop,
5562	[OP_SAVEFH] = nfsd4_encode_noop,
5563	[OP_SECINFO] = nfsd4_encode_secinfo,
5564	[OP_SETATTR] = nfsd4_encode_setattr,
5565	[OP_SETCLIENTID] = nfsd4_encode_setclientid,
5566	[OP_SETCLIENTID_CONFIRM] = nfsd4_encode_noop,
5567	[OP_VERIFY] = nfsd4_encode_noop,
5568	[OP_WRITE] = nfsd4_encode_write,
5569	[OP_RELEASE_LOCKOWNER] = nfsd4_encode_noop,
5570
5571	/* NFSv4.1 operations */
5572	[OP_BACKCHANNEL_CTL] = nfsd4_encode_noop,
5573	[OP_BIND_CONN_TO_SESSION] = nfsd4_encode_bind_conn_to_session,
5574	[OP_EXCHANGE_ID] = nfsd4_encode_exchange_id,
5575	[OP_CREATE_SESSION] = nfsd4_encode_create_session,
5576	[OP_DESTROY_SESSION] = nfsd4_encode_noop,
5577	[OP_FREE_STATEID] = nfsd4_encode_noop,
5578	[OP_GET_DIR_DELEGATION] = nfsd4_encode_noop,
5579	#ifdef CONFIG_NFSD_PNFS
5580	[OP_GETDEVICEINFO] = nfsd4_encode_getdeviceinfo,
5581	[OP_GETDEVICELIST] = nfsd4_encode_noop,
5582	[OP_LAYOUTCOMMIT] = nfsd4_encode_layoutcommit,
5583	[OP_LAYOUTGET] = nfsd4_encode_layoutget,
5584	[OP_LAYOUTRETURN] = nfsd4_encode_layoutreturn,
5585	#else
5586	[OP_GETDEVICEINFO] = nfsd4_encode_noop,
5587	[OP_GETDEVICELIST] = nfsd4_encode_noop,
5588	[OP_LAYOUTCOMMIT] = nfsd4_encode_noop,
5589	[OP_LAYOUTGET] = nfsd4_encode_noop,
5590	[OP_LAYOUTRETURN] = nfsd4_encode_noop,
5591	#endif
5592	[OP_SECINFO_NO_NAME] = nfsd4_encode_secinfo_no_name,
5593	[OP_SEQUENCE] = nfsd4_encode_sequence,
5594	[OP_SET_SSV] = nfsd4_encode_noop,
5595	[OP_TEST_STATEID] = nfsd4_encode_test_stateid,
5596	[OP_WANT_DELEGATION] = nfsd4_encode_noop,
5597	[OP_DESTROY_CLIENTID] = nfsd4_encode_noop,
5598	[OP_RECLAIM_COMPLETE] = nfsd4_encode_noop,
5599
5600	/* NFSv4.2 operations */
5601	[OP_ALLOCATE] = nfsd4_encode_noop,
5602	[OP_COPY] = nfsd4_encode_copy,
5603	[OP_COPY_NOTIFY] = nfsd4_encode_copy_notify,
5604	[OP_DEALLOCATE] = nfsd4_encode_noop,
5605	[OP_IO_ADVISE] = nfsd4_encode_noop,
5606	[OP_LAYOUTERROR] = nfsd4_encode_noop,
5607	[OP_LAYOUTSTATS] = nfsd4_encode_noop,
5608	[OP_OFFLOAD_CANCEL] = nfsd4_encode_noop,
5609	[OP_OFFLOAD_STATUS] = nfsd4_encode_offload_status,
5610	[OP_READ_PLUS] = nfsd4_encode_read_plus,
5611	[OP_SEEK] = nfsd4_encode_seek,
5612	[OP_WRITE_SAME] = nfsd4_encode_noop,
5613	[OP_CLONE] = nfsd4_encode_noop,
5614
5615	/* RFC 8276 extended atributes operations */
5616	[OP_GETXATTR] = nfsd4_encode_getxattr,
5617	[OP_SETXATTR] = nfsd4_encode_setxattr,
5618	[OP_LISTXATTRS] = nfsd4_encode_listxattrs,
5619	[OP_REMOVEXATTR] = nfsd4_encode_removexattr,
5620	};
5621
5622	/*
5623	* Calculate whether we still have space to encode repsize bytes.
5624	* There are two considerations:
5625	* - For NFS versions >=4.1, the size of the reply must stay within
5626	* session limits
5627	* - For all NFS versions, we must stay within limited preallocated
5628	* buffer space.
5629	*
5630	* This is called before the operation is processed, so can only provide
5631	* an upper estimate. For some nonidempotent operations (such as
5632	* getattr), it's not necessarily a problem if that estimate is wrong,
5633	* as we can fail it after processing without significant side effects.
5634	*/
5635	__be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
5636	{
5637	struct xdr_buf *buf = &resp->rqstp->rq_res;
5638	struct nfsd4_slot *slot = resp->cstate.slot;
5639
5640	if (buf->len + respsize <= buf->buflen)
5641	return nfs_ok;
5642	if (!nfsd4_has_session(cs: &resp->cstate))
5643	return nfserr_resource;
5644	if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
5645	WARN_ON_ONCE(1);
5646	return nfserr_rep_too_big_to_cache;
5647	}
5648	return nfserr_rep_too_big;
5649	}
5650
5651	void
5652	nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
5653	{
5654	struct xdr_stream *xdr = resp->xdr;
5655	struct nfs4_stateowner *so = resp->cstate.replay_owner;
5656	struct svc_rqst *rqstp = resp->rqstp;
5657	const struct nfsd4_operation *opdesc = op->opdesc;
5658	int post_err_offset;
5659	nfsd4_enc encoder;
5660	__be32 *p;
5661
5662	p = xdr_reserve_space(xdr, nbytes: 8);
5663	if (!p)
5664	goto release;
5665	*p++ = cpu_to_be32(op->opnum);
5666	post_err_offset = xdr->buf->len;
5667
5668	if (op->opnum == OP_ILLEGAL)
5669	goto status;
5670	if (op->status && opdesc &&
5671	!(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE))
5672	goto status;
5673	BUG_ON(op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
5674	!nfsd4_enc_ops[op->opnum]);
5675	encoder = nfsd4_enc_ops[op->opnum];
5676	op->status = encoder(resp, op->status, &op->u);
5677	if (op->status)
5678	trace_nfsd_compound_encode_err(rqstp, opnum: op->opnum, status: op->status);
5679	xdr_commit_encode(xdr);
5680
5681	/* nfsd4_check_resp_size guarantees enough room for error status */
5682	if (!op->status) {
5683	int space_needed = 0;
5684	if (!nfsd4_last_compound_op(rqstp))
5685	space_needed = COMPOUND_ERR_SLACK_SPACE;
5686	op->status = nfsd4_check_resp_size(resp, respsize: space_needed);
5687	}
5688	if (op->status == nfserr_resource && nfsd4_has_session(cs: &resp->cstate)) {
5689	struct nfsd4_slot *slot = resp->cstate.slot;
5690
5691	if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
5692	op->status = nfserr_rep_too_big_to_cache;
5693	else
5694	op->status = nfserr_rep_too_big;
5695	}
5696	if (op->status == nfserr_resource ||
5697	op->status == nfserr_rep_too_big ||
5698	op->status == nfserr_rep_too_big_to_cache) {
5699	/*
5700	* The operation may have already been encoded or
5701	* partially encoded. No op returns anything additional
5702	* in the case of one of these three errors, so we can
5703	* just truncate back to after the status. But it's a
5704	* bug if we had to do this on a non-idempotent op:
5705	*/
5706	warn_on_nonidempotent_op(op);
5707	xdr_truncate_encode(xdr, len: post_err_offset);
5708	}
5709	if (so) {
5710	int len = xdr->buf->len - post_err_offset;
5711
5712	so->so_replay.rp_status = op->status;
5713	so->so_replay.rp_buflen = len;
5714	read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
5715	so->so_replay.rp_buf, len);
5716	}
5717	status:
5718	*p = op->status;
5719	release:
5720	if (opdesc && opdesc->op_release)
5721	opdesc->op_release(&op->u);
5722
5723	/*
5724	* Account for pages consumed while encoding this operation.
5725	* The xdr_stream primitives don't manage rq_next_page.
5726	*/
5727	rqstp->rq_next_page = xdr->page_ptr + 1;
5728	}
5729
5730	/*
5731	* Encode the reply stored in the stateowner reply cache
5732	*
5733	* XDR note: do not encode rp->rp_buflen: the buffer contains the
5734	* previously sent already encoded operation.
5735	*/
5736	void
5737	nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
5738	{
5739	__be32 *p;
5740	struct nfs4_replay *rp = op->replay;
5741
5742	p = xdr_reserve_space(xdr, nbytes: 8 + rp->rp_buflen);
5743	if (!p) {
5744	WARN_ON_ONCE(1);
5745	return;
5746	}
5747	*p++ = cpu_to_be32(op->opnum);
5748	*p++ = rp->rp_status; /* already xdr'ed */
5749
5750	p = xdr_encode_opaque_fixed(p, ptr: rp->rp_buf, len: rp->rp_buflen);
5751	}
5752
5753	void nfsd4_release_compoundargs(struct svc_rqst *rqstp)
5754	{
5755	struct nfsd4_compoundargs *args = rqstp->rq_argp;
5756
5757	if (args->ops != args->iops) {
5758	vfree(addr: args->ops);
5759	args->ops = args->iops;
5760	}
5761	while (args->to_free) {
5762	struct svcxdr_tmpbuf *tb = args->to_free;
5763	args->to_free = tb->next;
5764	kfree(objp: tb);
5765	}
5766	}
5767
5768	bool
5769	nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
5770	{
5771	struct nfsd4_compoundargs *args = rqstp->rq_argp;
5772
5773	/* svcxdr_tmp_alloc */
5774	args->to_free = NULL;
5775
5776	args->xdr = xdr;
5777	args->ops = args->iops;
5778	args->rqstp = rqstp;
5779
5780	return nfsd4_decode_compound(argp: args);
5781	}
5782
5783	bool
5784	nfs4svc_encode_compoundres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
5785	{
5786	struct nfsd4_compoundres *resp = rqstp->rq_resp;
5787	__be32 *p;
5788
5789	/*
5790	* Send buffer space for the following items is reserved
5791	* at the top of nfsd4_proc_compound().
5792	*/
5793	p = resp->statusp;
5794
5795	*p++ = resp->cstate.status;
5796	*p++ = htonl(resp->taglen);
5797	memcpy(p, resp->tag, resp->taglen);
5798	p += XDR_QUADLEN(resp->taglen);
5799	*p++ = htonl(resp->opcnt);
5800
5801	nfsd4_sequence_done(resp);
5802	return true;
5803	}
5804