xref: /openbmc/linux/fs/nfs/nfs3xdr.c (revision 60772e48) 
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * linux/fs/nfs/nfs3xdr.c
4  *
5  * XDR functions to encode/decode NFSv3 RPC arguments and results.
6  *
7  * Copyright (C) 1996, 1997 Olaf Kirch
8  */
9 
10 #include <linux/param.h>
11 #include <linux/time.h>
12 #include <linux/mm.h>
13 #include <linux/errno.h>
14 #include <linux/string.h>
15 #include <linux/in.h>
16 #include <linux/pagemap.h>
17 #include <linux/proc_fs.h>
18 #include <linux/kdev_t.h>
19 #include <linux/sunrpc/clnt.h>
20 #include <linux/nfs.h>
21 #include <linux/nfs3.h>
22 #include <linux/nfs_fs.h>
23 #include <linux/nfsacl.h>
24 #include "internal.h"
25 
26 #define NFSDBG_FACILITY		NFSDBG_XDR
27 
28 /* Mapping from NFS error code to "errno" error code. */
29 #define errno_NFSERR_IO		EIO
30 
31 /*
32  * Declare the space requirements for NFS arguments and replies as
33  * number of 32bit-words
34  */
35 #define NFS3_fhandle_sz		(1+16)
36 #define NFS3_fh_sz		(NFS3_fhandle_sz)	/* shorthand */
37 #define NFS3_sattr_sz		(15)
38 #define NFS3_filename_sz	(1+(NFS3_MAXNAMLEN>>2))
39 #define NFS3_path_sz		(1+(NFS3_MAXPATHLEN>>2))
40 #define NFS3_fattr_sz		(21)
41 #define NFS3_cookieverf_sz	(NFS3_COOKIEVERFSIZE>>2)
42 #define NFS3_wcc_attr_sz	(6)
43 #define NFS3_pre_op_attr_sz	(1+NFS3_wcc_attr_sz)
44 #define NFS3_post_op_attr_sz	(1+NFS3_fattr_sz)
45 #define NFS3_wcc_data_sz	(NFS3_pre_op_attr_sz+NFS3_post_op_attr_sz)
46 #define NFS3_diropargs_sz	(NFS3_fh_sz+NFS3_filename_sz)
47 
48 #define NFS3_getattrargs_sz	(NFS3_fh_sz)
49 #define NFS3_setattrargs_sz	(NFS3_fh_sz+NFS3_sattr_sz+3)
50 #define NFS3_lookupargs_sz	(NFS3_fh_sz+NFS3_filename_sz)
51 #define NFS3_accessargs_sz	(NFS3_fh_sz+1)
52 #define NFS3_readlinkargs_sz	(NFS3_fh_sz)
53 #define NFS3_readargs_sz	(NFS3_fh_sz+3)
54 #define NFS3_writeargs_sz	(NFS3_fh_sz+5)
55 #define NFS3_createargs_sz	(NFS3_diropargs_sz+NFS3_sattr_sz)
56 #define NFS3_mkdirargs_sz	(NFS3_diropargs_sz+NFS3_sattr_sz)
57 #define NFS3_symlinkargs_sz	(NFS3_diropargs_sz+1+NFS3_sattr_sz)
58 #define NFS3_mknodargs_sz	(NFS3_diropargs_sz+2+NFS3_sattr_sz)
59 #define NFS3_removeargs_sz	(NFS3_fh_sz+NFS3_filename_sz)
60 #define NFS3_renameargs_sz	(NFS3_diropargs_sz+NFS3_diropargs_sz)
61 #define NFS3_linkargs_sz		(NFS3_fh_sz+NFS3_diropargs_sz)
62 #define NFS3_readdirargs_sz	(NFS3_fh_sz+NFS3_cookieverf_sz+3)
63 #define NFS3_readdirplusargs_sz	(NFS3_fh_sz+NFS3_cookieverf_sz+4)
64 #define NFS3_commitargs_sz	(NFS3_fh_sz+3)
65 
66 #define NFS3_getattrres_sz	(1+NFS3_fattr_sz)
67 #define NFS3_setattrres_sz	(1+NFS3_wcc_data_sz)
68 #define NFS3_removeres_sz	(NFS3_setattrres_sz)
69 #define NFS3_lookupres_sz	(1+NFS3_fh_sz+(2 * NFS3_post_op_attr_sz))
70 #define NFS3_accessres_sz	(1+NFS3_post_op_attr_sz+1)
71 #define NFS3_readlinkres_sz	(1+NFS3_post_op_attr_sz+1)
72 #define NFS3_readres_sz		(1+NFS3_post_op_attr_sz+3)
73 #define NFS3_writeres_sz	(1+NFS3_wcc_data_sz+4)
74 #define NFS3_createres_sz	(1+NFS3_fh_sz+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
75 #define NFS3_renameres_sz	(1+(2 * NFS3_wcc_data_sz))
76 #define NFS3_linkres_sz		(1+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
77 #define NFS3_readdirres_sz	(1+NFS3_post_op_attr_sz+2)
78 #define NFS3_fsstatres_sz	(1+NFS3_post_op_attr_sz+13)
79 #define NFS3_fsinfores_sz	(1+NFS3_post_op_attr_sz+12)
80 #define NFS3_pathconfres_sz	(1+NFS3_post_op_attr_sz+6)
81 #define NFS3_commitres_sz	(1+NFS3_wcc_data_sz+2)
82 
83 #define ACL3_getaclargs_sz	(NFS3_fh_sz+1)
84 #define ACL3_setaclargs_sz	(NFS3_fh_sz+1+ \
85 				XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
86 #define ACL3_getaclres_sz	(1+NFS3_post_op_attr_sz+1+ \
87 				XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
88 #define ACL3_setaclres_sz	(1+NFS3_post_op_attr_sz)
89 
90 static int nfs3_stat_to_errno(enum nfs_stat);
91 
92 /*
93  * Map file type to S_IFMT bits
94  */
95 static const umode_t nfs_type2fmt[] = {
96 	[NF3BAD] = 0,
97 	[NF3REG] = S_IFREG,
98 	[NF3DIR] = S_IFDIR,
99 	[NF3BLK] = S_IFBLK,
100 	[NF3CHR] = S_IFCHR,
101 	[NF3LNK] = S_IFLNK,
102 	[NF3SOCK] = S_IFSOCK,
103 	[NF3FIFO] = S_IFIFO,
104 };
105 
106 /*
107  * While encoding arguments, set up the reply buffer in advance to
108  * receive reply data directly into the page cache.
109  */
110 static void prepare_reply_buffer(struct rpc_rqst *req, struct page **pages,
111 				 unsigned int base, unsigned int len,
112 				 unsigned int bufsize)
113 {
114 	struct rpc_auth	*auth = req->rq_cred->cr_auth;
115 	unsigned int replen;
116 
117 	replen = RPC_REPHDRSIZE + auth->au_rslack + bufsize;
118 	xdr_inline_pages(&req->rq_rcv_buf, replen << 2, pages, base, len);
119 }
120 
121 /*
122  * Handle decode buffer overflows out-of-line.
123  */
124 static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
125 {
126 	dprintk("NFS: %s prematurely hit the end of our receive buffer. "
127 		"Remaining buffer length is %tu words.\n",
128 		func, xdr->end - xdr->p);
129 }
130 
131 
132 /*
133  * Encode/decode NFSv3 basic data types
134  *
135  * Basic NFSv3 data types are defined in section 2.5 of RFC 1813:
136  * "NFS Version 3 Protocol Specification".
137  *
138  * Not all basic data types have their own encoding and decoding
139  * functions.  For run-time efficiency, some data types are encoded
140  * or decoded inline.
141  */
142 
143 static void encode_uint32(struct xdr_stream *xdr, u32 value)
144 {
145 	__be32 *p = xdr_reserve_space(xdr, 4);
146 	*p = cpu_to_be32(value);
147 }
148 
149 static int decode_uint32(struct xdr_stream *xdr, u32 *value)
150 {
151 	__be32 *p;
152 
153 	p = xdr_inline_decode(xdr, 4);
154 	if (unlikely(p == NULL))
155 		goto out_overflow;
156 	*value = be32_to_cpup(p);
157 	return 0;
158 out_overflow:
159 	print_overflow_msg(__func__, xdr);
160 	return -EIO;
161 }
162 
163 static int decode_uint64(struct xdr_stream *xdr, u64 *value)
164 {
165 	__be32 *p;
166 
167 	p = xdr_inline_decode(xdr, 8);
168 	if (unlikely(p == NULL))
169 		goto out_overflow;
170 	xdr_decode_hyper(p, value);
171 	return 0;
172 out_overflow:
173 	print_overflow_msg(__func__, xdr);
174 	return -EIO;
175 }
176 
177 /*
178  * fileid3
179  *
180  *	typedef uint64 fileid3;
181  */
182 static __be32 *xdr_decode_fileid3(__be32 *p, u64 *fileid)
183 {
184 	return xdr_decode_hyper(p, fileid);
185 }
186 
187 static int decode_fileid3(struct xdr_stream *xdr, u64 *fileid)
188 {
189 	return decode_uint64(xdr, fileid);
190 }
191 
192 /*
193  * filename3
194  *
195  *	typedef string filename3<>;
196  */
197 static void encode_filename3(struct xdr_stream *xdr,
198 			     const char *name, u32 length)
199 {
200 	__be32 *p;
201 
202 	WARN_ON_ONCE(length > NFS3_MAXNAMLEN);
203 	p = xdr_reserve_space(xdr, 4 + length);
204 	xdr_encode_opaque(p, name, length);
205 }
206 
207 static int decode_inline_filename3(struct xdr_stream *xdr,
208 				   const char **name, u32 *length)
209 {
210 	__be32 *p;
211 	u32 count;
212 
213 	p = xdr_inline_decode(xdr, 4);
214 	if (unlikely(p == NULL))
215 		goto out_overflow;
216 	count = be32_to_cpup(p);
217 	if (count > NFS3_MAXNAMLEN)
218 		goto out_nametoolong;
219 	p = xdr_inline_decode(xdr, count);
220 	if (unlikely(p == NULL))
221 		goto out_overflow;
222 	*name = (const char *)p;
223 	*length = count;
224 	return 0;
225 
226 out_nametoolong:
227 	dprintk("NFS: returned filename too long: %u\n", count);
228 	return -ENAMETOOLONG;
229 out_overflow:
230 	print_overflow_msg(__func__, xdr);
231 	return -EIO;
232 }
233 
234 /*
235  * nfspath3
236  *
237  *	typedef string nfspath3<>;
238  */
239 static void encode_nfspath3(struct xdr_stream *xdr, struct page **pages,
240 			    const u32 length)
241 {
242 	encode_uint32(xdr, length);
243 	xdr_write_pages(xdr, pages, 0, length);
244 }
245 
246 static int decode_nfspath3(struct xdr_stream *xdr)
247 {
248 	u32 recvd, count;
249 	__be32 *p;
250 
251 	p = xdr_inline_decode(xdr, 4);
252 	if (unlikely(p == NULL))
253 		goto out_overflow;
254 	count = be32_to_cpup(p);
255 	if (unlikely(count >= xdr->buf->page_len || count > NFS3_MAXPATHLEN))
256 		goto out_nametoolong;
257 	recvd = xdr_read_pages(xdr, count);
258 	if (unlikely(count > recvd))
259 		goto out_cheating;
260 	xdr_terminate_string(xdr->buf, count);
261 	return 0;
262 
263 out_nametoolong:
264 	dprintk("NFS: returned pathname too long: %u\n", count);
265 	return -ENAMETOOLONG;
266 out_cheating:
267 	dprintk("NFS: server cheating in pathname result: "
268 		"count %u > recvd %u\n", count, recvd);
269 	return -EIO;
270 out_overflow:
271 	print_overflow_msg(__func__, xdr);
272 	return -EIO;
273 }
274 
275 /*
276  * cookie3
277  *
278  *	typedef uint64 cookie3
279  */
280 static __be32 *xdr_encode_cookie3(__be32 *p, u64 cookie)
281 {
282 	return xdr_encode_hyper(p, cookie);
283 }
284 
285 static int decode_cookie3(struct xdr_stream *xdr, u64 *cookie)
286 {
287 	return decode_uint64(xdr, cookie);
288 }
289 
290 /*
291  * cookieverf3
292  *
293  *	typedef opaque cookieverf3[NFS3_COOKIEVERFSIZE];
294  */
295 static __be32 *xdr_encode_cookieverf3(__be32 *p, const __be32 *verifier)
296 {
297 	memcpy(p, verifier, NFS3_COOKIEVERFSIZE);
298 	return p + XDR_QUADLEN(NFS3_COOKIEVERFSIZE);
299 }
300 
301 static int decode_cookieverf3(struct xdr_stream *xdr, __be32 *verifier)
302 {
303 	__be32 *p;
304 
305 	p = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE);
306 	if (unlikely(p == NULL))
307 		goto out_overflow;
308 	memcpy(verifier, p, NFS3_COOKIEVERFSIZE);
309 	return 0;
310 out_overflow:
311 	print_overflow_msg(__func__, xdr);
312 	return -EIO;
313 }
314 
315 /*
316  * createverf3
317  *
318  *	typedef opaque createverf3[NFS3_CREATEVERFSIZE];
319  */
320 static void encode_createverf3(struct xdr_stream *xdr, const __be32 *verifier)
321 {
322 	__be32 *p;
323 
324 	p = xdr_reserve_space(xdr, NFS3_CREATEVERFSIZE);
325 	memcpy(p, verifier, NFS3_CREATEVERFSIZE);
326 }
327 
328 static int decode_writeverf3(struct xdr_stream *xdr, struct nfs_write_verifier *verifier)
329 {
330 	__be32 *p;
331 
332 	p = xdr_inline_decode(xdr, NFS3_WRITEVERFSIZE);
333 	if (unlikely(p == NULL))
334 		goto out_overflow;
335 	memcpy(verifier->data, p, NFS3_WRITEVERFSIZE);
336 	return 0;
337 out_overflow:
338 	print_overflow_msg(__func__, xdr);
339 	return -EIO;
340 }
341 
342 /*
343  * size3
344  *
345  *	typedef uint64 size3;
346  */
347 static __be32 *xdr_decode_size3(__be32 *p, u64 *size)
348 {
349 	return xdr_decode_hyper(p, size);
350 }
351 
352 /*
353  * nfsstat3
354  *
355  *	enum nfsstat3 {
356  *		NFS3_OK = 0,
357  *		...
358  *	}
359  */
360 #define NFS3_OK		NFS_OK
361 
362 static int decode_nfsstat3(struct xdr_stream *xdr, enum nfs_stat *status)
363 {
364 	__be32 *p;
365 
366 	p = xdr_inline_decode(xdr, 4);
367 	if (unlikely(p == NULL))
368 		goto out_overflow;
369 	*status = be32_to_cpup(p);
370 	return 0;
371 out_overflow:
372 	print_overflow_msg(__func__, xdr);
373 	return -EIO;
374 }
375 
376 /*
377  * ftype3
378  *
379  *	enum ftype3 {
380  *		NF3REG	= 1,
381  *		NF3DIR	= 2,
382  *		NF3BLK	= 3,
383  *		NF3CHR	= 4,
384  *		NF3LNK	= 5,
385  *		NF3SOCK	= 6,
386  *		NF3FIFO	= 7
387  *	};
388  */
389 static void encode_ftype3(struct xdr_stream *xdr, const u32 type)
390 {
391 	encode_uint32(xdr, type);
392 }
393 
394 static __be32 *xdr_decode_ftype3(__be32 *p, umode_t *mode)
395 {
396 	u32 type;
397 
398 	type = be32_to_cpup(p++);
399 	if (type > NF3FIFO)
400 		type = NF3NON;
401 	*mode = nfs_type2fmt[type];
402 	return p;
403 }
404 
405 /*
406  * specdata3
407  *
408  *     struct specdata3 {
409  *             uint32  specdata1;
410  *             uint32  specdata2;
411  *     };
412  */
413 static void encode_specdata3(struct xdr_stream *xdr, const dev_t rdev)
414 {
415 	__be32 *p;
416 
417 	p = xdr_reserve_space(xdr, 8);
418 	*p++ = cpu_to_be32(MAJOR(rdev));
419 	*p = cpu_to_be32(MINOR(rdev));
420 }
421 
422 static __be32 *xdr_decode_specdata3(__be32 *p, dev_t *rdev)
423 {
424 	unsigned int major, minor;
425 
426 	major = be32_to_cpup(p++);
427 	minor = be32_to_cpup(p++);
428 	*rdev = MKDEV(major, minor);
429 	if (MAJOR(*rdev) != major || MINOR(*rdev) != minor)
430 		*rdev = 0;
431 	return p;
432 }
433 
434 /*
435  * nfs_fh3
436  *
437  *	struct nfs_fh3 {
438  *		opaque       data<NFS3_FHSIZE>;
439  *	};
440  */
441 static void encode_nfs_fh3(struct xdr_stream *xdr, const struct nfs_fh *fh)
442 {
443 	__be32 *p;
444 
445 	WARN_ON_ONCE(fh->size > NFS3_FHSIZE);
446 	p = xdr_reserve_space(xdr, 4 + fh->size);
447 	xdr_encode_opaque(p, fh->data, fh->size);
448 }
449 
450 static int decode_nfs_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
451 {
452 	u32 length;
453 	__be32 *p;
454 
455 	p = xdr_inline_decode(xdr, 4);
456 	if (unlikely(p == NULL))
457 		goto out_overflow;
458 	length = be32_to_cpup(p++);
459 	if (unlikely(length > NFS3_FHSIZE))
460 		goto out_toobig;
461 	p = xdr_inline_decode(xdr, length);
462 	if (unlikely(p == NULL))
463 		goto out_overflow;
464 	fh->size = length;
465 	memcpy(fh->data, p, length);
466 	return 0;
467 out_toobig:
468 	dprintk("NFS: file handle size (%u) too big\n", length);
469 	return -E2BIG;
470 out_overflow:
471 	print_overflow_msg(__func__, xdr);
472 	return -EIO;
473 }
474 
475 static void zero_nfs_fh3(struct nfs_fh *fh)
476 {
477 	memset(fh, 0, sizeof(*fh));
478 }
479 
480 /*
481  * nfstime3
482  *
483  *	struct nfstime3 {
484  *		uint32	seconds;
485  *		uint32	nseconds;
486  *	};
487  */
488 static __be32 *xdr_encode_nfstime3(__be32 *p, const struct timespec *timep)
489 {
490 	*p++ = cpu_to_be32(timep->tv_sec);
491 	*p++ = cpu_to_be32(timep->tv_nsec);
492 	return p;
493 }
494 
495 static __be32 *xdr_decode_nfstime3(__be32 *p, struct timespec *timep)
496 {
497 	timep->tv_sec = be32_to_cpup(p++);
498 	timep->tv_nsec = be32_to_cpup(p++);
499 	return p;
500 }
501 
502 /*
503  * sattr3
504  *
505  *	enum time_how {
506  *		DONT_CHANGE		= 0,
507  *		SET_TO_SERVER_TIME	= 1,
508  *		SET_TO_CLIENT_TIME	= 2
509  *	};
510  *
511  *	union set_mode3 switch (bool set_it) {
512  *	case TRUE:
513  *		mode3	mode;
514  *	default:
515  *		void;
516  *	};
517  *
518  *	union set_uid3 switch (bool set_it) {
519  *	case TRUE:
520  *		uid3	uid;
521  *	default:
522  *		void;
523  *	};
524  *
525  *	union set_gid3 switch (bool set_it) {
526  *	case TRUE:
527  *		gid3	gid;
528  *	default:
529  *		void;
530  *	};
531  *
532  *	union set_size3 switch (bool set_it) {
533  *	case TRUE:
534  *		size3	size;
535  *	default:
536  *		void;
537  *	};
538  *
539  *	union set_atime switch (time_how set_it) {
540  *	case SET_TO_CLIENT_TIME:
541  *		nfstime3	atime;
542  *	default:
543  *		void;
544  *	};
545  *
546  *	union set_mtime switch (time_how set_it) {
547  *	case SET_TO_CLIENT_TIME:
548  *		nfstime3  mtime;
549  *	default:
550  *		void;
551  *	};
552  *
553  *	struct sattr3 {
554  *		set_mode3	mode;
555  *		set_uid3	uid;
556  *		set_gid3	gid;
557  *		set_size3	size;
558  *		set_atime	atime;
559  *		set_mtime	mtime;
560  *	};
561  */
562 static void encode_sattr3(struct xdr_stream *xdr, const struct iattr *attr)
563 {
564 	u32 nbytes;
565 	__be32 *p;
566 
567 	/*
568 	 * In order to make only a single xdr_reserve_space() call,
569 	 * pre-compute the total number of bytes to be reserved.
570 	 * Six boolean values, one for each set_foo field, are always
571 	 * present in the encoded result, so start there.
572 	 */
573 	nbytes = 6 * 4;
574 	if (attr->ia_valid & ATTR_MODE)
575 		nbytes += 4;
576 	if (attr->ia_valid & ATTR_UID)
577 		nbytes += 4;
578 	if (attr->ia_valid & ATTR_GID)
579 		nbytes += 4;
580 	if (attr->ia_valid & ATTR_SIZE)
581 		nbytes += 8;
582 	if (attr->ia_valid & ATTR_ATIME_SET)
583 		nbytes += 8;
584 	if (attr->ia_valid & ATTR_MTIME_SET)
585 		nbytes += 8;
586 	p = xdr_reserve_space(xdr, nbytes);
587 
588 	if (attr->ia_valid & ATTR_MODE) {
589 		*p++ = xdr_one;
590 		*p++ = cpu_to_be32(attr->ia_mode & S_IALLUGO);
591 	} else
592 		*p++ = xdr_zero;
593 
594 	if (attr->ia_valid & ATTR_UID) {
595 		*p++ = xdr_one;
596 		*p++ = cpu_to_be32(from_kuid(&init_user_ns, attr->ia_uid));
597 	} else
598 		*p++ = xdr_zero;
599 
600 	if (attr->ia_valid & ATTR_GID) {
601 		*p++ = xdr_one;
602 		*p++ = cpu_to_be32(from_kgid(&init_user_ns, attr->ia_gid));
603 	} else
604 		*p++ = xdr_zero;
605 
606 	if (attr->ia_valid & ATTR_SIZE) {
607 		*p++ = xdr_one;
608 		p = xdr_encode_hyper(p, (u64)attr->ia_size);
609 	} else
610 		*p++ = xdr_zero;
611 
612 	if (attr->ia_valid & ATTR_ATIME_SET) {
613 		*p++ = xdr_two;
614 		p = xdr_encode_nfstime3(p, &attr->ia_atime);
615 	} else if (attr->ia_valid & ATTR_ATIME) {
616 		*p++ = xdr_one;
617 	} else
618 		*p++ = xdr_zero;
619 
620 	if (attr->ia_valid & ATTR_MTIME_SET) {
621 		*p++ = xdr_two;
622 		xdr_encode_nfstime3(p, &attr->ia_mtime);
623 	} else if (attr->ia_valid & ATTR_MTIME) {
624 		*p = xdr_one;
625 	} else
626 		*p = xdr_zero;
627 }
628 
629 /*
630  * fattr3
631  *
632  *	struct fattr3 {
633  *		ftype3		type;
634  *		mode3		mode;
635  *		uint32		nlink;
636  *		uid3		uid;
637  *		gid3		gid;
638  *		size3		size;
639  *		size3		used;
640  *		specdata3	rdev;
641  *		uint64		fsid;
642  *		fileid3		fileid;
643  *		nfstime3	atime;
644  *		nfstime3	mtime;
645  *		nfstime3	ctime;
646  *	};
647  */
648 static int decode_fattr3(struct xdr_stream *xdr, struct nfs_fattr *fattr)
649 {
650 	umode_t fmode;
651 	__be32 *p;
652 
653 	p = xdr_inline_decode(xdr, NFS3_fattr_sz << 2);
654 	if (unlikely(p == NULL))
655 		goto out_overflow;
656 
657 	p = xdr_decode_ftype3(p, &fmode);
658 
659 	fattr->mode = (be32_to_cpup(p++) & ~S_IFMT) | fmode;
660 	fattr->nlink = be32_to_cpup(p++);
661 	fattr->uid = make_kuid(&init_user_ns, be32_to_cpup(p++));
662 	if (!uid_valid(fattr->uid))
663 		goto out_uid;
664 	fattr->gid = make_kgid(&init_user_ns, be32_to_cpup(p++));
665 	if (!gid_valid(fattr->gid))
666 		goto out_gid;
667 
668 	p = xdr_decode_size3(p, &fattr->size);
669 	p = xdr_decode_size3(p, &fattr->du.nfs3.used);
670 	p = xdr_decode_specdata3(p, &fattr->rdev);
671 
672 	p = xdr_decode_hyper(p, &fattr->fsid.major);
673 	fattr->fsid.minor = 0;
674 
675 	p = xdr_decode_fileid3(p, &fattr->fileid);
676 	p = xdr_decode_nfstime3(p, &fattr->atime);
677 	p = xdr_decode_nfstime3(p, &fattr->mtime);
678 	xdr_decode_nfstime3(p, &fattr->ctime);
679 	fattr->change_attr = nfs_timespec_to_change_attr(&fattr->ctime);
680 
681 	fattr->valid |= NFS_ATTR_FATTR_V3;
682 	return 0;
683 out_uid:
684 	dprintk("NFS: returned invalid uid\n");
685 	return -EINVAL;
686 out_gid:
687 	dprintk("NFS: returned invalid gid\n");
688 	return -EINVAL;
689 out_overflow:
690 	print_overflow_msg(__func__, xdr);
691 	return -EIO;
692 }
693 
694 /*
695  * post_op_attr
696  *
697  *	union post_op_attr switch (bool attributes_follow) {
698  *	case TRUE:
699  *		fattr3	attributes;
700  *	case FALSE:
701  *		void;
702  *	};
703  */
704 static int decode_post_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
705 {
706 	__be32 *p;
707 
708 	p = xdr_inline_decode(xdr, 4);
709 	if (unlikely(p == NULL))
710 		goto out_overflow;
711 	if (*p != xdr_zero)
712 		return decode_fattr3(xdr, fattr);
713 	return 0;
714 out_overflow:
715 	print_overflow_msg(__func__, xdr);
716 	return -EIO;
717 }
718 
719 /*
720  * wcc_attr
721  *	struct wcc_attr {
722  *		size3		size;
723  *		nfstime3	mtime;
724  *		nfstime3	ctime;
725  *	};
726  */
727 static int decode_wcc_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
728 {
729 	__be32 *p;
730 
731 	p = xdr_inline_decode(xdr, NFS3_wcc_attr_sz << 2);
732 	if (unlikely(p == NULL))
733 		goto out_overflow;
734 
735 	fattr->valid |= NFS_ATTR_FATTR_PRESIZE
736 		| NFS_ATTR_FATTR_PRECHANGE
737 		| NFS_ATTR_FATTR_PREMTIME
738 		| NFS_ATTR_FATTR_PRECTIME;
739 
740 	p = xdr_decode_size3(p, &fattr->pre_size);
741 	p = xdr_decode_nfstime3(p, &fattr->pre_mtime);
742 	xdr_decode_nfstime3(p, &fattr->pre_ctime);
743 	fattr->pre_change_attr = nfs_timespec_to_change_attr(&fattr->pre_ctime);
744 
745 	return 0;
746 out_overflow:
747 	print_overflow_msg(__func__, xdr);
748 	return -EIO;
749 }
750 
751 /*
752  * pre_op_attr
753  *	union pre_op_attr switch (bool attributes_follow) {
754  *	case TRUE:
755  *		wcc_attr	attributes;
756  *	case FALSE:
757  *		void;
758  *	};
759  *
760  * wcc_data
761  *
762  *	struct wcc_data {
763  *		pre_op_attr	before;
764  *		post_op_attr	after;
765  *	};
766  */
767 static int decode_pre_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
768 {
769 	__be32 *p;
770 
771 	p = xdr_inline_decode(xdr, 4);
772 	if (unlikely(p == NULL))
773 		goto out_overflow;
774 	if (*p != xdr_zero)
775 		return decode_wcc_attr(xdr, fattr);
776 	return 0;
777 out_overflow:
778 	print_overflow_msg(__func__, xdr);
779 	return -EIO;
780 }
781 
782 static int decode_wcc_data(struct xdr_stream *xdr, struct nfs_fattr *fattr)
783 {
784 	int error;
785 
786 	error = decode_pre_op_attr(xdr, fattr);
787 	if (unlikely(error))
788 		goto out;
789 	error = decode_post_op_attr(xdr, fattr);
790 out:
791 	return error;
792 }
793 
794 /*
795  * post_op_fh3
796  *
797  *	union post_op_fh3 switch (bool handle_follows) {
798  *	case TRUE:
799  *		nfs_fh3  handle;
800  *	case FALSE:
801  *		void;
802  *	};
803  */
804 static int decode_post_op_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
805 {
806 	__be32 *p = xdr_inline_decode(xdr, 4);
807 	if (unlikely(p == NULL))
808 		goto out_overflow;
809 	if (*p != xdr_zero)
810 		return decode_nfs_fh3(xdr, fh);
811 	zero_nfs_fh3(fh);
812 	return 0;
813 out_overflow:
814 	print_overflow_msg(__func__, xdr);
815 	return -EIO;
816 }
817 
818 /*
819  * diropargs3
820  *
821  *	struct diropargs3 {
822  *		nfs_fh3		dir;
823  *		filename3	name;
824  *	};
825  */
826 static void encode_diropargs3(struct xdr_stream *xdr, const struct nfs_fh *fh,
827 			      const char *name, u32 length)
828 {
829 	encode_nfs_fh3(xdr, fh);
830 	encode_filename3(xdr, name, length);
831 }
832 
833 
834 /*
835  * NFSv3 XDR encode functions
836  *
837  * NFSv3 argument types are defined in section 3.3 of RFC 1813:
838  * "NFS Version 3 Protocol Specification".
839  */
840 
841 /*
842  * 3.3.1  GETATTR3args
843  *
844  *	struct GETATTR3args {
845  *		nfs_fh3  object;
846  *	};
847  */
848 static void nfs3_xdr_enc_getattr3args(struct rpc_rqst *req,
849 				      struct xdr_stream *xdr,
850 				      const void *data)
851 {
852 	const struct nfs_fh *fh = data;
853 
854 	encode_nfs_fh3(xdr, fh);
855 }
856 
857 /*
858  * 3.3.2  SETATTR3args
859  *
860  *	union sattrguard3 switch (bool check) {
861  *	case TRUE:
862  *		nfstime3  obj_ctime;
863  *	case FALSE:
864  *		void;
865  *	};
866  *
867  *	struct SETATTR3args {
868  *		nfs_fh3		object;
869  *		sattr3		new_attributes;
870  *		sattrguard3	guard;
871  *	};
872  */
873 static void encode_sattrguard3(struct xdr_stream *xdr,
874 			       const struct nfs3_sattrargs *args)
875 {
876 	__be32 *p;
877 
878 	if (args->guard) {
879 		p = xdr_reserve_space(xdr, 4 + 8);
880 		*p++ = xdr_one;
881 		xdr_encode_nfstime3(p, &args->guardtime);
882 	} else {
883 		p = xdr_reserve_space(xdr, 4);
884 		*p = xdr_zero;
885 	}
886 }
887 
888 static void nfs3_xdr_enc_setattr3args(struct rpc_rqst *req,
889 				      struct xdr_stream *xdr,
890 				      const void *data)
891 {
892 	const struct nfs3_sattrargs *args = data;
893 	encode_nfs_fh3(xdr, args->fh);
894 	encode_sattr3(xdr, args->sattr);
895 	encode_sattrguard3(xdr, args);
896 }
897 
898 /*
899  * 3.3.3  LOOKUP3args
900  *
901  *	struct LOOKUP3args {
902  *		diropargs3  what;
903  *	};
904  */
905 static void nfs3_xdr_enc_lookup3args(struct rpc_rqst *req,
906 				     struct xdr_stream *xdr,
907 				     const void *data)
908 {
909 	const struct nfs3_diropargs *args = data;
910 
911 	encode_diropargs3(xdr, args->fh, args->name, args->len);
912 }
913 
914 /*
915  * 3.3.4  ACCESS3args
916  *
917  *	struct ACCESS3args {
918  *		nfs_fh3		object;
919  *		uint32		access;
920  *	};
921  */
922 static void encode_access3args(struct xdr_stream *xdr,
923 			       const struct nfs3_accessargs *args)
924 {
925 	encode_nfs_fh3(xdr, args->fh);
926 	encode_uint32(xdr, args->access);
927 }
928 
929 static void nfs3_xdr_enc_access3args(struct rpc_rqst *req,
930 				     struct xdr_stream *xdr,
931 				     const void *data)
932 {
933 	const struct nfs3_accessargs *args = data;
934 
935 	encode_access3args(xdr, args);
936 }
937 
938 /*
939  * 3.3.5  READLINK3args
940  *
941  *	struct READLINK3args {
942  *		nfs_fh3	symlink;
943  *	};
944  */
945 static void nfs3_xdr_enc_readlink3args(struct rpc_rqst *req,
946 				       struct xdr_stream *xdr,
947 				       const void *data)
948 {
949 	const struct nfs3_readlinkargs *args = data;
950 
951 	encode_nfs_fh3(xdr, args->fh);
952 	prepare_reply_buffer(req, args->pages, args->pgbase,
953 					args->pglen, NFS3_readlinkres_sz);
954 }
955 
956 /*
957  * 3.3.6  READ3args
958  *
959  *	struct READ3args {
960  *		nfs_fh3		file;
961  *		offset3		offset;
962  *		count3		count;
963  *	};
964  */
965 static void encode_read3args(struct xdr_stream *xdr,
966 			     const struct nfs_pgio_args *args)
967 {
968 	__be32 *p;
969 
970 	encode_nfs_fh3(xdr, args->fh);
971 
972 	p = xdr_reserve_space(xdr, 8 + 4);
973 	p = xdr_encode_hyper(p, args->offset);
974 	*p = cpu_to_be32(args->count);
975 }
976 
977 static void nfs3_xdr_enc_read3args(struct rpc_rqst *req,
978 				   struct xdr_stream *xdr,
979 				   const void *data)
980 {
981 	const struct nfs_pgio_args *args = data;
982 
983 	encode_read3args(xdr, args);
984 	prepare_reply_buffer(req, args->pages, args->pgbase,
985 					args->count, NFS3_readres_sz);
986 	req->rq_rcv_buf.flags |= XDRBUF_READ;
987 }
988 
989 /*
990  * 3.3.7  WRITE3args
991  *
992  *	enum stable_how {
993  *		UNSTABLE  = 0,
994  *		DATA_SYNC = 1,
995  *		FILE_SYNC = 2
996  *	};
997  *
998  *	struct WRITE3args {
999  *		nfs_fh3		file;
1000  *		offset3		offset;
1001  *		count3		count;
1002  *		stable_how	stable;
1003  *		opaque		data<>;
1004  *	};
1005  */
1006 static void encode_write3args(struct xdr_stream *xdr,
1007 			      const struct nfs_pgio_args *args)
1008 {
1009 	__be32 *p;
1010 
1011 	encode_nfs_fh3(xdr, args->fh);
1012 
1013 	p = xdr_reserve_space(xdr, 8 + 4 + 4 + 4);
1014 	p = xdr_encode_hyper(p, args->offset);
1015 	*p++ = cpu_to_be32(args->count);
1016 	*p++ = cpu_to_be32(args->stable);
1017 	*p = cpu_to_be32(args->count);
1018 	xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
1019 }
1020 
1021 static void nfs3_xdr_enc_write3args(struct rpc_rqst *req,
1022 				    struct xdr_stream *xdr,
1023 				    const void *data)
1024 {
1025 	const struct nfs_pgio_args *args = data;
1026 
1027 	encode_write3args(xdr, args);
1028 	xdr->buf->flags |= XDRBUF_WRITE;
1029 }
1030 
1031 /*
1032  * 3.3.8  CREATE3args
1033  *
1034  *	enum createmode3 {
1035  *		UNCHECKED = 0,
1036  *		GUARDED   = 1,
1037  *		EXCLUSIVE = 2
1038  *	};
1039  *
1040  *	union createhow3 switch (createmode3 mode) {
1041  *	case UNCHECKED:
1042  *	case GUARDED:
1043  *		sattr3       obj_attributes;
1044  *	case EXCLUSIVE:
1045  *		createverf3  verf;
1046  *	};
1047  *
1048  *	struct CREATE3args {
1049  *		diropargs3	where;
1050  *		createhow3	how;
1051  *	};
1052  */
1053 static void encode_createhow3(struct xdr_stream *xdr,
1054 			      const struct nfs3_createargs *args)
1055 {
1056 	encode_uint32(xdr, args->createmode);
1057 	switch (args->createmode) {
1058 	case NFS3_CREATE_UNCHECKED:
1059 	case NFS3_CREATE_GUARDED:
1060 		encode_sattr3(xdr, args->sattr);
1061 		break;
1062 	case NFS3_CREATE_EXCLUSIVE:
1063 		encode_createverf3(xdr, args->verifier);
1064 		break;
1065 	default:
1066 		BUG();
1067 	}
1068 }
1069 
1070 static void nfs3_xdr_enc_create3args(struct rpc_rqst *req,
1071 				     struct xdr_stream *xdr,
1072 				     const void *data)
1073 {
1074 	const struct nfs3_createargs *args = data;
1075 
1076 	encode_diropargs3(xdr, args->fh, args->name, args->len);
1077 	encode_createhow3(xdr, args);
1078 }
1079 
1080 /*
1081  * 3.3.9  MKDIR3args
1082  *
1083  *	struct MKDIR3args {
1084  *		diropargs3	where;
1085  *		sattr3		attributes;
1086  *	};
1087  */
1088 static void nfs3_xdr_enc_mkdir3args(struct rpc_rqst *req,
1089 				    struct xdr_stream *xdr,
1090 				    const void *data)
1091 {
1092 	const struct nfs3_mkdirargs *args = data;
1093 
1094 	encode_diropargs3(xdr, args->fh, args->name, args->len);
1095 	encode_sattr3(xdr, args->sattr);
1096 }
1097 
1098 /*
1099  * 3.3.10  SYMLINK3args
1100  *
1101  *	struct symlinkdata3 {
1102  *		sattr3		symlink_attributes;
1103  *		nfspath3	symlink_data;
1104  *	};
1105  *
1106  *	struct SYMLINK3args {
1107  *		diropargs3	where;
1108  *		symlinkdata3	symlink;
1109  *	};
1110  */
1111 static void encode_symlinkdata3(struct xdr_stream *xdr,
1112 				const void *data)
1113 {
1114 	const struct nfs3_symlinkargs *args = data;
1115 
1116 	encode_sattr3(xdr, args->sattr);
1117 	encode_nfspath3(xdr, args->pages, args->pathlen);
1118 }
1119 
1120 static void nfs3_xdr_enc_symlink3args(struct rpc_rqst *req,
1121 				      struct xdr_stream *xdr,
1122 				      const void *data)
1123 {
1124 	const struct nfs3_symlinkargs *args = data;
1125 
1126 	encode_diropargs3(xdr, args->fromfh, args->fromname, args->fromlen);
1127 	encode_symlinkdata3(xdr, args);
1128 	xdr->buf->flags |= XDRBUF_WRITE;
1129 }
1130 
1131 /*
1132  * 3.3.11  MKNOD3args
1133  *
1134  *	struct devicedata3 {
1135  *		sattr3		dev_attributes;
1136  *		specdata3	spec;
1137  *	};
1138  *
1139  *	union mknoddata3 switch (ftype3 type) {
1140  *	case NF3CHR:
1141  *	case NF3BLK:
1142  *		devicedata3	device;
1143  *	case NF3SOCK:
1144  *	case NF3FIFO:
1145  *		sattr3		pipe_attributes;
1146  *	default:
1147  *		void;
1148  *	};
1149  *
1150  *	struct MKNOD3args {
1151  *		diropargs3	where;
1152  *		mknoddata3	what;
1153  *	};
1154  */
1155 static void encode_devicedata3(struct xdr_stream *xdr,
1156 			       const struct nfs3_mknodargs *args)
1157 {
1158 	encode_sattr3(xdr, args->sattr);
1159 	encode_specdata3(xdr, args->rdev);
1160 }
1161 
1162 static void encode_mknoddata3(struct xdr_stream *xdr,
1163 			      const struct nfs3_mknodargs *args)
1164 {
1165 	encode_ftype3(xdr, args->type);
1166 	switch (args->type) {
1167 	case NF3CHR:
1168 	case NF3BLK:
1169 		encode_devicedata3(xdr, args);
1170 		break;
1171 	case NF3SOCK:
1172 	case NF3FIFO:
1173 		encode_sattr3(xdr, args->sattr);
1174 		break;
1175 	case NF3REG:
1176 	case NF3DIR:
1177 		break;
1178 	default:
1179 		BUG();
1180 	}
1181 }
1182 
1183 static void nfs3_xdr_enc_mknod3args(struct rpc_rqst *req,
1184 				    struct xdr_stream *xdr,
1185 				    const void *data)
1186 {
1187 	const struct nfs3_mknodargs *args = data;
1188 
1189 	encode_diropargs3(xdr, args->fh, args->name, args->len);
1190 	encode_mknoddata3(xdr, args);
1191 }
1192 
1193 /*
1194  * 3.3.12  REMOVE3args
1195  *
1196  *	struct REMOVE3args {
1197  *		diropargs3  object;
1198  *	};
1199  */
1200 static void nfs3_xdr_enc_remove3args(struct rpc_rqst *req,
1201 				     struct xdr_stream *xdr,
1202 				     const void *data)
1203 {
1204 	const struct nfs_removeargs *args = data;
1205 
1206 	encode_diropargs3(xdr, args->fh, args->name.name, args->name.len);
1207 }
1208 
1209 /*
1210  * 3.3.14  RENAME3args
1211  *
1212  *	struct RENAME3args {
1213  *		diropargs3	from;
1214  *		diropargs3	to;
1215  *	};
1216  */
1217 static void nfs3_xdr_enc_rename3args(struct rpc_rqst *req,
1218 				     struct xdr_stream *xdr,
1219 				     const void *data)
1220 {
1221 	const struct nfs_renameargs *args = data;
1222 	const struct qstr *old = args->old_name;
1223 	const struct qstr *new = args->new_name;
1224 
1225 	encode_diropargs3(xdr, args->old_dir, old->name, old->len);
1226 	encode_diropargs3(xdr, args->new_dir, new->name, new->len);
1227 }
1228 
1229 /*
1230  * 3.3.15  LINK3args
1231  *
1232  *	struct LINK3args {
1233  *		nfs_fh3		file;
1234  *		diropargs3	link;
1235  *	};
1236  */
1237 static void nfs3_xdr_enc_link3args(struct rpc_rqst *req,
1238 				   struct xdr_stream *xdr,
1239 				   const void *data)
1240 {
1241 	const struct nfs3_linkargs *args = data;
1242 
1243 	encode_nfs_fh3(xdr, args->fromfh);
1244 	encode_diropargs3(xdr, args->tofh, args->toname, args->tolen);
1245 }
1246 
1247 /*
1248  * 3.3.16  READDIR3args
1249  *
1250  *	struct READDIR3args {
1251  *		nfs_fh3		dir;
1252  *		cookie3		cookie;
1253  *		cookieverf3	cookieverf;
1254  *		count3		count;
1255  *	};
1256  */
1257 static void encode_readdir3args(struct xdr_stream *xdr,
1258 				const struct nfs3_readdirargs *args)
1259 {
1260 	__be32 *p;
1261 
1262 	encode_nfs_fh3(xdr, args->fh);
1263 
1264 	p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4);
1265 	p = xdr_encode_cookie3(p, args->cookie);
1266 	p = xdr_encode_cookieverf3(p, args->verf);
1267 	*p = cpu_to_be32(args->count);
1268 }
1269 
1270 static void nfs3_xdr_enc_readdir3args(struct rpc_rqst *req,
1271 				      struct xdr_stream *xdr,
1272 				      const void *data)
1273 {
1274 	const struct nfs3_readdirargs *args = data;
1275 
1276 	encode_readdir3args(xdr, args);
1277 	prepare_reply_buffer(req, args->pages, 0,
1278 				args->count, NFS3_readdirres_sz);
1279 }
1280 
1281 /*
1282  * 3.3.17  READDIRPLUS3args
1283  *
1284  *	struct READDIRPLUS3args {
1285  *		nfs_fh3		dir;
1286  *		cookie3		cookie;
1287  *		cookieverf3	cookieverf;
1288  *		count3		dircount;
1289  *		count3		maxcount;
1290  *	};
1291  */
1292 static void encode_readdirplus3args(struct xdr_stream *xdr,
1293 				    const struct nfs3_readdirargs *args)
1294 {
1295 	__be32 *p;
1296 
1297 	encode_nfs_fh3(xdr, args->fh);
1298 
1299 	p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4 + 4);
1300 	p = xdr_encode_cookie3(p, args->cookie);
1301 	p = xdr_encode_cookieverf3(p, args->verf);
1302 
1303 	/*
1304 	 * readdirplus: need dircount + buffer size.
1305 	 * We just make sure we make dircount big enough
1306 	 */
1307 	*p++ = cpu_to_be32(args->count >> 3);
1308 
1309 	*p = cpu_to_be32(args->count);
1310 }
1311 
1312 static void nfs3_xdr_enc_readdirplus3args(struct rpc_rqst *req,
1313 					  struct xdr_stream *xdr,
1314 					  const void *data)
1315 {
1316 	const struct nfs3_readdirargs *args = data;
1317 
1318 	encode_readdirplus3args(xdr, args);
1319 	prepare_reply_buffer(req, args->pages, 0,
1320 				args->count, NFS3_readdirres_sz);
1321 }
1322 
1323 /*
1324  * 3.3.21  COMMIT3args
1325  *
1326  *	struct COMMIT3args {
1327  *		nfs_fh3		file;
1328  *		offset3		offset;
1329  *		count3		count;
1330  *	};
1331  */
1332 static void encode_commit3args(struct xdr_stream *xdr,
1333 			       const struct nfs_commitargs *args)
1334 {
1335 	__be32 *p;
1336 
1337 	encode_nfs_fh3(xdr, args->fh);
1338 
1339 	p = xdr_reserve_space(xdr, 8 + 4);
1340 	p = xdr_encode_hyper(p, args->offset);
1341 	*p = cpu_to_be32(args->count);
1342 }
1343 
1344 static void nfs3_xdr_enc_commit3args(struct rpc_rqst *req,
1345 				     struct xdr_stream *xdr,
1346 				     const void *data)
1347 {
1348 	const struct nfs_commitargs *args = data;
1349 
1350 	encode_commit3args(xdr, args);
1351 }
1352 
1353 #ifdef CONFIG_NFS_V3_ACL
1354 
1355 static void nfs3_xdr_enc_getacl3args(struct rpc_rqst *req,
1356 				     struct xdr_stream *xdr,
1357 				     const void *data)
1358 {
1359 	const struct nfs3_getaclargs *args = data;
1360 
1361 	encode_nfs_fh3(xdr, args->fh);
1362 	encode_uint32(xdr, args->mask);
1363 	if (args->mask & (NFS_ACL | NFS_DFACL))
1364 		prepare_reply_buffer(req, args->pages, 0,
1365 					NFSACL_MAXPAGES << PAGE_SHIFT,
1366 					ACL3_getaclres_sz);
1367 }
1368 
1369 static void nfs3_xdr_enc_setacl3args(struct rpc_rqst *req,
1370 				     struct xdr_stream *xdr,
1371 				     const void *data)
1372 {
1373 	const struct nfs3_setaclargs *args = data;
1374 	unsigned int base;
1375 	int error;
1376 
1377 	encode_nfs_fh3(xdr, NFS_FH(args->inode));
1378 	encode_uint32(xdr, args->mask);
1379 
1380 	base = req->rq_slen;
1381 	if (args->npages != 0)
1382 		xdr_write_pages(xdr, args->pages, 0, args->len);
1383 	else
1384 		xdr_reserve_space(xdr, args->len);
1385 
1386 	error = nfsacl_encode(xdr->buf, base, args->inode,
1387 			    (args->mask & NFS_ACL) ?
1388 			    args->acl_access : NULL, 1, 0);
1389 	/* FIXME: this is just broken */
1390 	BUG_ON(error < 0);
1391 	error = nfsacl_encode(xdr->buf, base + error, args->inode,
1392 			    (args->mask & NFS_DFACL) ?
1393 			    args->acl_default : NULL, 1,
1394 			    NFS_ACL_DEFAULT);
1395 	BUG_ON(error < 0);
1396 }
1397 
1398 #endif  /* CONFIG_NFS_V3_ACL */
1399 
1400 /*
1401  * NFSv3 XDR decode functions
1402  *
1403  * NFSv3 result types are defined in section 3.3 of RFC 1813:
1404  * "NFS Version 3 Protocol Specification".
1405  */
1406 
1407 /*
1408  * 3.3.1  GETATTR3res
1409  *
1410  *	struct GETATTR3resok {
1411  *		fattr3		obj_attributes;
1412  *	};
1413  *
1414  *	union GETATTR3res switch (nfsstat3 status) {
1415  *	case NFS3_OK:
1416  *		GETATTR3resok  resok;
1417  *	default:
1418  *		void;
1419  *	};
1420  */
1421 static int nfs3_xdr_dec_getattr3res(struct rpc_rqst *req,
1422 				    struct xdr_stream *xdr,
1423 				    void *result)
1424 {
1425 	enum nfs_stat status;
1426 	int error;
1427 
1428 	error = decode_nfsstat3(xdr, &status);
1429 	if (unlikely(error))
1430 		goto out;
1431 	if (status != NFS3_OK)
1432 		goto out_default;
1433 	error = decode_fattr3(xdr, result);
1434 out:
1435 	return error;
1436 out_default:
1437 	return nfs3_stat_to_errno(status);
1438 }
1439 
1440 /*
1441  * 3.3.2  SETATTR3res
1442  *
1443  *	struct SETATTR3resok {
1444  *		wcc_data  obj_wcc;
1445  *	};
1446  *
1447  *	struct SETATTR3resfail {
1448  *		wcc_data  obj_wcc;
1449  *	};
1450  *
1451  *	union SETATTR3res switch (nfsstat3 status) {
1452  *	case NFS3_OK:
1453  *		SETATTR3resok   resok;
1454  *	default:
1455  *		SETATTR3resfail resfail;
1456  *	};
1457  */
1458 static int nfs3_xdr_dec_setattr3res(struct rpc_rqst *req,
1459 				    struct xdr_stream *xdr,
1460 				    void *result)
1461 {
1462 	enum nfs_stat status;
1463 	int error;
1464 
1465 	error = decode_nfsstat3(xdr, &status);
1466 	if (unlikely(error))
1467 		goto out;
1468 	error = decode_wcc_data(xdr, result);
1469 	if (unlikely(error))
1470 		goto out;
1471 	if (status != NFS3_OK)
1472 		goto out_status;
1473 out:
1474 	return error;
1475 out_status:
1476 	return nfs3_stat_to_errno(status);
1477 }
1478 
1479 /*
1480  * 3.3.3  LOOKUP3res
1481  *
1482  *	struct LOOKUP3resok {
1483  *		nfs_fh3		object;
1484  *		post_op_attr	obj_attributes;
1485  *		post_op_attr	dir_attributes;
1486  *	};
1487  *
1488  *	struct LOOKUP3resfail {
1489  *		post_op_attr	dir_attributes;
1490  *	};
1491  *
1492  *	union LOOKUP3res switch (nfsstat3 status) {
1493  *	case NFS3_OK:
1494  *		LOOKUP3resok	resok;
1495  *	default:
1496  *		LOOKUP3resfail	resfail;
1497  *	};
1498  */
1499 static int nfs3_xdr_dec_lookup3res(struct rpc_rqst *req,
1500 				   struct xdr_stream *xdr,
1501 				   void *data)
1502 {
1503 	struct nfs3_diropres *result = data;
1504 	enum nfs_stat status;
1505 	int error;
1506 
1507 	error = decode_nfsstat3(xdr, &status);
1508 	if (unlikely(error))
1509 		goto out;
1510 	if (status != NFS3_OK)
1511 		goto out_default;
1512 	error = decode_nfs_fh3(xdr, result->fh);
1513 	if (unlikely(error))
1514 		goto out;
1515 	error = decode_post_op_attr(xdr, result->fattr);
1516 	if (unlikely(error))
1517 		goto out;
1518 	error = decode_post_op_attr(xdr, result->dir_attr);
1519 out:
1520 	return error;
1521 out_default:
1522 	error = decode_post_op_attr(xdr, result->dir_attr);
1523 	if (unlikely(error))
1524 		goto out;
1525 	return nfs3_stat_to_errno(status);
1526 }
1527 
1528 /*
1529  * 3.3.4  ACCESS3res
1530  *
1531  *	struct ACCESS3resok {
1532  *		post_op_attr	obj_attributes;
1533  *		uint32		access;
1534  *	};
1535  *
1536  *	struct ACCESS3resfail {
1537  *		post_op_attr	obj_attributes;
1538  *	};
1539  *
1540  *	union ACCESS3res switch (nfsstat3 status) {
1541  *	case NFS3_OK:
1542  *		ACCESS3resok	resok;
1543  *	default:
1544  *		ACCESS3resfail	resfail;
1545  *	};
1546  */
1547 static int nfs3_xdr_dec_access3res(struct rpc_rqst *req,
1548 				   struct xdr_stream *xdr,
1549 				   void *data)
1550 {
1551 	struct nfs3_accessres *result = data;
1552 	enum nfs_stat status;
1553 	int error;
1554 
1555 	error = decode_nfsstat3(xdr, &status);
1556 	if (unlikely(error))
1557 		goto out;
1558 	error = decode_post_op_attr(xdr, result->fattr);
1559 	if (unlikely(error))
1560 		goto out;
1561 	if (status != NFS3_OK)
1562 		goto out_default;
1563 	error = decode_uint32(xdr, &result->access);
1564 out:
1565 	return error;
1566 out_default:
1567 	return nfs3_stat_to_errno(status);
1568 }
1569 
1570 /*
1571  * 3.3.5  READLINK3res
1572  *
1573  *	struct READLINK3resok {
1574  *		post_op_attr	symlink_attributes;
1575  *		nfspath3	data;
1576  *	};
1577  *
1578  *	struct READLINK3resfail {
1579  *		post_op_attr	symlink_attributes;
1580  *	};
1581  *
1582  *	union READLINK3res switch (nfsstat3 status) {
1583  *	case NFS3_OK:
1584  *		READLINK3resok	resok;
1585  *	default:
1586  *		READLINK3resfail resfail;
1587  *	};
1588  */
1589 static int nfs3_xdr_dec_readlink3res(struct rpc_rqst *req,
1590 				     struct xdr_stream *xdr,
1591 				     void *result)
1592 {
1593 	enum nfs_stat status;
1594 	int error;
1595 
1596 	error = decode_nfsstat3(xdr, &status);
1597 	if (unlikely(error))
1598 		goto out;
1599 	error = decode_post_op_attr(xdr, result);
1600 	if (unlikely(error))
1601 		goto out;
1602 	if (status != NFS3_OK)
1603 		goto out_default;
1604 	error = decode_nfspath3(xdr);
1605 out:
1606 	return error;
1607 out_default:
1608 	return nfs3_stat_to_errno(status);
1609 }
1610 
1611 /*
1612  * 3.3.6  READ3res
1613  *
1614  *	struct READ3resok {
1615  *		post_op_attr	file_attributes;
1616  *		count3		count;
1617  *		bool		eof;
1618  *		opaque		data<>;
1619  *	};
1620  *
1621  *	struct READ3resfail {
1622  *		post_op_attr	file_attributes;
1623  *	};
1624  *
1625  *	union READ3res switch (nfsstat3 status) {
1626  *	case NFS3_OK:
1627  *		READ3resok	resok;
1628  *	default:
1629  *		READ3resfail	resfail;
1630  *	};
1631  */
1632 static int decode_read3resok(struct xdr_stream *xdr,
1633 			     struct nfs_pgio_res *result)
1634 {
1635 	u32 eof, count, ocount, recvd;
1636 	__be32 *p;
1637 
1638 	p = xdr_inline_decode(xdr, 4 + 4 + 4);
1639 	if (unlikely(p == NULL))
1640 		goto out_overflow;
1641 	count = be32_to_cpup(p++);
1642 	eof = be32_to_cpup(p++);
1643 	ocount = be32_to_cpup(p++);
1644 	if (unlikely(ocount != count))
1645 		goto out_mismatch;
1646 	recvd = xdr_read_pages(xdr, count);
1647 	if (unlikely(count > recvd))
1648 		goto out_cheating;
1649 out:
1650 	result->eof = eof;
1651 	result->count = count;
1652 	return count;
1653 out_mismatch:
1654 	dprintk("NFS: READ count doesn't match length of opaque: "
1655 		"count %u != ocount %u\n", count, ocount);
1656 	return -EIO;
1657 out_cheating:
1658 	dprintk("NFS: server cheating in read result: "
1659 		"count %u > recvd %u\n", count, recvd);
1660 	count = recvd;
1661 	eof = 0;
1662 	goto out;
1663 out_overflow:
1664 	print_overflow_msg(__func__, xdr);
1665 	return -EIO;
1666 }
1667 
1668 static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1669 				 void *data)
1670 {
1671 	struct nfs_pgio_res *result = data;
1672 	enum nfs_stat status;
1673 	int error;
1674 
1675 	error = decode_nfsstat3(xdr, &status);
1676 	if (unlikely(error))
1677 		goto out;
1678 	error = decode_post_op_attr(xdr, result->fattr);
1679 	if (unlikely(error))
1680 		goto out;
1681 	result->op_status = status;
1682 	if (status != NFS3_OK)
1683 		goto out_status;
1684 	error = decode_read3resok(xdr, result);
1685 out:
1686 	return error;
1687 out_status:
1688 	return nfs3_stat_to_errno(status);
1689 }
1690 
1691 /*
1692  * 3.3.7  WRITE3res
1693  *
1694  *	enum stable_how {
1695  *		UNSTABLE  = 0,
1696  *		DATA_SYNC = 1,
1697  *		FILE_SYNC = 2
1698  *	};
1699  *
1700  *	struct WRITE3resok {
1701  *		wcc_data	file_wcc;
1702  *		count3		count;
1703  *		stable_how	committed;
1704  *		writeverf3	verf;
1705  *	};
1706  *
1707  *	struct WRITE3resfail {
1708  *		wcc_data	file_wcc;
1709  *	};
1710  *
1711  *	union WRITE3res switch (nfsstat3 status) {
1712  *	case NFS3_OK:
1713  *		WRITE3resok	resok;
1714  *	default:
1715  *		WRITE3resfail	resfail;
1716  *	};
1717  */
1718 static int decode_write3resok(struct xdr_stream *xdr,
1719 			      struct nfs_pgio_res *result)
1720 {
1721 	__be32 *p;
1722 
1723 	p = xdr_inline_decode(xdr, 4 + 4);
1724 	if (unlikely(p == NULL))
1725 		goto out_overflow;
1726 	result->count = be32_to_cpup(p++);
1727 	result->verf->committed = be32_to_cpup(p++);
1728 	if (unlikely(result->verf->committed > NFS_FILE_SYNC))
1729 		goto out_badvalue;
1730 	if (decode_writeverf3(xdr, &result->verf->verifier))
1731 		goto out_eio;
1732 	return result->count;
1733 out_badvalue:
1734 	dprintk("NFS: bad stable_how value: %u\n", result->verf->committed);
1735 	return -EIO;
1736 out_overflow:
1737 	print_overflow_msg(__func__, xdr);
1738 out_eio:
1739 	return -EIO;
1740 }
1741 
1742 static int nfs3_xdr_dec_write3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1743 				  void *data)
1744 {
1745 	struct nfs_pgio_res *result = data;
1746 	enum nfs_stat status;
1747 	int error;
1748 
1749 	error = decode_nfsstat3(xdr, &status);
1750 	if (unlikely(error))
1751 		goto out;
1752 	error = decode_wcc_data(xdr, result->fattr);
1753 	if (unlikely(error))
1754 		goto out;
1755 	result->op_status = status;
1756 	if (status != NFS3_OK)
1757 		goto out_status;
1758 	error = decode_write3resok(xdr, result);
1759 out:
1760 	return error;
1761 out_status:
1762 	return nfs3_stat_to_errno(status);
1763 }
1764 
1765 /*
1766  * 3.3.8  CREATE3res
1767  *
1768  *	struct CREATE3resok {
1769  *		post_op_fh3	obj;
1770  *		post_op_attr	obj_attributes;
1771  *		wcc_data	dir_wcc;
1772  *	};
1773  *
1774  *	struct CREATE3resfail {
1775  *		wcc_data	dir_wcc;
1776  *	};
1777  *
1778  *	union CREATE3res switch (nfsstat3 status) {
1779  *	case NFS3_OK:
1780  *		CREATE3resok	resok;
1781  *	default:
1782  *		CREATE3resfail	resfail;
1783  *	};
1784  */
1785 static int decode_create3resok(struct xdr_stream *xdr,
1786 			       struct nfs3_diropres *result)
1787 {
1788 	int error;
1789 
1790 	error = decode_post_op_fh3(xdr, result->fh);
1791 	if (unlikely(error))
1792 		goto out;
1793 	error = decode_post_op_attr(xdr, result->fattr);
1794 	if (unlikely(error))
1795 		goto out;
1796 	/* The server isn't required to return a file handle.
1797 	 * If it didn't, force the client to perform a LOOKUP
1798 	 * to determine the correct file handle and attribute
1799 	 * values for the new object. */
1800 	if (result->fh->size == 0)
1801 		result->fattr->valid = 0;
1802 	error = decode_wcc_data(xdr, result->dir_attr);
1803 out:
1804 	return error;
1805 }
1806 
1807 static int nfs3_xdr_dec_create3res(struct rpc_rqst *req,
1808 				   struct xdr_stream *xdr,
1809 				   void *data)
1810 {
1811 	struct nfs3_diropres *result = data;
1812 	enum nfs_stat status;
1813 	int error;
1814 
1815 	error = decode_nfsstat3(xdr, &status);
1816 	if (unlikely(error))
1817 		goto out;
1818 	if (status != NFS3_OK)
1819 		goto out_default;
1820 	error = decode_create3resok(xdr, result);
1821 out:
1822 	return error;
1823 out_default:
1824 	error = decode_wcc_data(xdr, result->dir_attr);
1825 	if (unlikely(error))
1826 		goto out;
1827 	return nfs3_stat_to_errno(status);
1828 }
1829 
1830 /*
1831  * 3.3.12  REMOVE3res
1832  *
1833  *	struct REMOVE3resok {
1834  *		wcc_data    dir_wcc;
1835  *	};
1836  *
1837  *	struct REMOVE3resfail {
1838  *		wcc_data    dir_wcc;
1839  *	};
1840  *
1841  *	union REMOVE3res switch (nfsstat3 status) {
1842  *	case NFS3_OK:
1843  *		REMOVE3resok   resok;
1844  *	default:
1845  *		REMOVE3resfail resfail;
1846  *	};
1847  */
1848 static int nfs3_xdr_dec_remove3res(struct rpc_rqst *req,
1849 				   struct xdr_stream *xdr,
1850 				   void *data)
1851 {
1852 	struct nfs_removeres *result = data;
1853 	enum nfs_stat status;
1854 	int error;
1855 
1856 	error = decode_nfsstat3(xdr, &status);
1857 	if (unlikely(error))
1858 		goto out;
1859 	error = decode_wcc_data(xdr, result->dir_attr);
1860 	if (unlikely(error))
1861 		goto out;
1862 	if (status != NFS3_OK)
1863 		goto out_status;
1864 out:
1865 	return error;
1866 out_status:
1867 	return nfs3_stat_to_errno(status);
1868 }
1869 
1870 /*
1871  * 3.3.14  RENAME3res
1872  *
1873  *	struct RENAME3resok {
1874  *		wcc_data	fromdir_wcc;
1875  *		wcc_data	todir_wcc;
1876  *	};
1877  *
1878  *	struct RENAME3resfail {
1879  *		wcc_data	fromdir_wcc;
1880  *		wcc_data	todir_wcc;
1881  *	};
1882  *
1883  *	union RENAME3res switch (nfsstat3 status) {
1884  *	case NFS3_OK:
1885  *		RENAME3resok   resok;
1886  *	default:
1887  *		RENAME3resfail resfail;
1888  *	};
1889  */
1890 static int nfs3_xdr_dec_rename3res(struct rpc_rqst *req,
1891 				   struct xdr_stream *xdr,
1892 				   void *data)
1893 {
1894 	struct nfs_renameres *result = data;
1895 	enum nfs_stat status;
1896 	int error;
1897 
1898 	error = decode_nfsstat3(xdr, &status);
1899 	if (unlikely(error))
1900 		goto out;
1901 	error = decode_wcc_data(xdr, result->old_fattr);
1902 	if (unlikely(error))
1903 		goto out;
1904 	error = decode_wcc_data(xdr, result->new_fattr);
1905 	if (unlikely(error))
1906 		goto out;
1907 	if (status != NFS3_OK)
1908 		goto out_status;
1909 out:
1910 	return error;
1911 out_status:
1912 	return nfs3_stat_to_errno(status);
1913 }
1914 
1915 /*
1916  * 3.3.15  LINK3res
1917  *
1918  *	struct LINK3resok {
1919  *		post_op_attr	file_attributes;
1920  *		wcc_data	linkdir_wcc;
1921  *	};
1922  *
1923  *	struct LINK3resfail {
1924  *		post_op_attr	file_attributes;
1925  *		wcc_data	linkdir_wcc;
1926  *	};
1927  *
1928  *	union LINK3res switch (nfsstat3 status) {
1929  *	case NFS3_OK:
1930  *		LINK3resok	resok;
1931  *	default:
1932  *		LINK3resfail	resfail;
1933  *	};
1934  */
1935 static int nfs3_xdr_dec_link3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1936 				 void *data)
1937 {
1938 	struct nfs3_linkres *result = data;
1939 	enum nfs_stat status;
1940 	int error;
1941 
1942 	error = decode_nfsstat3(xdr, &status);
1943 	if (unlikely(error))
1944 		goto out;
1945 	error = decode_post_op_attr(xdr, result->fattr);
1946 	if (unlikely(error))
1947 		goto out;
1948 	error = decode_wcc_data(xdr, result->dir_attr);
1949 	if (unlikely(error))
1950 		goto out;
1951 	if (status != NFS3_OK)
1952 		goto out_status;
1953 out:
1954 	return error;
1955 out_status:
1956 	return nfs3_stat_to_errno(status);
1957 }
1958 
1959 /**
1960  * nfs3_decode_dirent - Decode a single NFSv3 directory entry stored in
1961  *			the local page cache
1962  * @xdr: XDR stream where entry resides
1963  * @entry: buffer to fill in with entry data
1964  * @plus: boolean indicating whether this should be a readdirplus entry
1965  *
1966  * Returns zero if successful, otherwise a negative errno value is
1967  * returned.
1968  *
1969  * This function is not invoked during READDIR reply decoding, but
1970  * rather whenever an application invokes the getdents(2) system call
1971  * on a directory already in our cache.
1972  *
1973  * 3.3.16  entry3
1974  *
1975  *	struct entry3 {
1976  *		fileid3		fileid;
1977  *		filename3	name;
1978  *		cookie3		cookie;
1979  *		fhandle3	filehandle;
1980  *		post_op_attr3	attributes;
1981  *		entry3		*nextentry;
1982  *	};
1983  *
1984  * 3.3.17  entryplus3
1985  *	struct entryplus3 {
1986  *		fileid3		fileid;
1987  *		filename3	name;
1988  *		cookie3		cookie;
1989  *		post_op_attr	name_attributes;
1990  *		post_op_fh3	name_handle;
1991  *		entryplus3	*nextentry;
1992  *	};
1993  */
1994 int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
1995 		       bool plus)
1996 {
1997 	struct nfs_entry old = *entry;
1998 	__be32 *p;
1999 	int error;
2000 
2001 	p = xdr_inline_decode(xdr, 4);
2002 	if (unlikely(p == NULL))
2003 		goto out_overflow;
2004 	if (*p == xdr_zero) {
2005 		p = xdr_inline_decode(xdr, 4);
2006 		if (unlikely(p == NULL))
2007 			goto out_overflow;
2008 		if (*p == xdr_zero)
2009 			return -EAGAIN;
2010 		entry->eof = 1;
2011 		return -EBADCOOKIE;
2012 	}
2013 
2014 	error = decode_fileid3(xdr, &entry->ino);
2015 	if (unlikely(error))
2016 		return error;
2017 
2018 	error = decode_inline_filename3(xdr, &entry->name, &entry->len);
2019 	if (unlikely(error))
2020 		return error;
2021 
2022 	entry->prev_cookie = entry->cookie;
2023 	error = decode_cookie3(xdr, &entry->cookie);
2024 	if (unlikely(error))
2025 		return error;
2026 
2027 	entry->d_type = DT_UNKNOWN;
2028 
2029 	if (plus) {
2030 		entry->fattr->valid = 0;
2031 		error = decode_post_op_attr(xdr, entry->fattr);
2032 		if (unlikely(error))
2033 			return error;
2034 		if (entry->fattr->valid & NFS_ATTR_FATTR_V3)
2035 			entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);
2036 
2037 		if (entry->fattr->fileid != entry->ino) {
2038 			entry->fattr->mounted_on_fileid = entry->ino;
2039 			entry->fattr->valid |= NFS_ATTR_FATTR_MOUNTED_ON_FILEID;
2040 		}
2041 
2042 		/* In fact, a post_op_fh3: */
2043 		p = xdr_inline_decode(xdr, 4);
2044 		if (unlikely(p == NULL))
2045 			goto out_overflow;
2046 		if (*p != xdr_zero) {
2047 			error = decode_nfs_fh3(xdr, entry->fh);
2048 			if (unlikely(error)) {
2049 				if (error == -E2BIG)
2050 					goto out_truncated;
2051 				return error;
2052 			}
2053 		} else
2054 			zero_nfs_fh3(entry->fh);
2055 	}
2056 
2057 	return 0;
2058 
2059 out_overflow:
2060 	print_overflow_msg(__func__, xdr);
2061 	return -EAGAIN;
2062 out_truncated:
2063 	dprintk("NFS: directory entry contains invalid file handle\n");
2064 	*entry = old;
2065 	return -EAGAIN;
2066 }
2067 
2068 /*
2069  * 3.3.16  READDIR3res
2070  *
2071  *	struct dirlist3 {
2072  *		entry3		*entries;
2073  *		bool		eof;
2074  *	};
2075  *
2076  *	struct READDIR3resok {
2077  *		post_op_attr	dir_attributes;
2078  *		cookieverf3	cookieverf;
2079  *		dirlist3	reply;
2080  *	};
2081  *
2082  *	struct READDIR3resfail {
2083  *		post_op_attr	dir_attributes;
2084  *	};
2085  *
2086  *	union READDIR3res switch (nfsstat3 status) {
2087  *	case NFS3_OK:
2088  *		READDIR3resok	resok;
2089  *	default:
2090  *		READDIR3resfail	resfail;
2091  *	};
2092  *
2093  * Read the directory contents into the page cache, but otherwise
2094  * don't touch them.  The actual decoding is done by nfs3_decode_entry()
2095  * during subsequent nfs_readdir() calls.
2096  */
2097 static int decode_dirlist3(struct xdr_stream *xdr)
2098 {
2099 	return xdr_read_pages(xdr, xdr->buf->page_len);
2100 }
2101 
2102 static int decode_readdir3resok(struct xdr_stream *xdr,
2103 				struct nfs3_readdirres *result)
2104 {
2105 	int error;
2106 
2107 	error = decode_post_op_attr(xdr, result->dir_attr);
2108 	if (unlikely(error))
2109 		goto out;
2110 	/* XXX: do we need to check if result->verf != NULL ? */
2111 	error = decode_cookieverf3(xdr, result->verf);
2112 	if (unlikely(error))
2113 		goto out;
2114 	error = decode_dirlist3(xdr);
2115 out:
2116 	return error;
2117 }
2118 
2119 static int nfs3_xdr_dec_readdir3res(struct rpc_rqst *req,
2120 				    struct xdr_stream *xdr,
2121 				    void *data)
2122 {
2123 	struct nfs3_readdirres *result = data;
2124 	enum nfs_stat status;
2125 	int error;
2126 
2127 	error = decode_nfsstat3(xdr, &status);
2128 	if (unlikely(error))
2129 		goto out;
2130 	if (status != NFS3_OK)
2131 		goto out_default;
2132 	error = decode_readdir3resok(xdr, result);
2133 out:
2134 	return error;
2135 out_default:
2136 	error = decode_post_op_attr(xdr, result->dir_attr);
2137 	if (unlikely(error))
2138 		goto out;
2139 	return nfs3_stat_to_errno(status);
2140 }
2141 
2142 /*
2143  * 3.3.18  FSSTAT3res
2144  *
2145  *	struct FSSTAT3resok {
2146  *		post_op_attr	obj_attributes;
2147  *		size3		tbytes;
2148  *		size3		fbytes;
2149  *		size3		abytes;
2150  *		size3		tfiles;
2151  *		size3		ffiles;
2152  *		size3		afiles;
2153  *		uint32		invarsec;
2154  *	};
2155  *
2156  *	struct FSSTAT3resfail {
2157  *		post_op_attr	obj_attributes;
2158  *	};
2159  *
2160  *	union FSSTAT3res switch (nfsstat3 status) {
2161  *	case NFS3_OK:
2162  *		FSSTAT3resok	resok;
2163  *	default:
2164  *		FSSTAT3resfail	resfail;
2165  *	};
2166  */
2167 static int decode_fsstat3resok(struct xdr_stream *xdr,
2168 			       struct nfs_fsstat *result)
2169 {
2170 	__be32 *p;
2171 
2172 	p = xdr_inline_decode(xdr, 8 * 6 + 4);
2173 	if (unlikely(p == NULL))
2174 		goto out_overflow;
2175 	p = xdr_decode_size3(p, &result->tbytes);
2176 	p = xdr_decode_size3(p, &result->fbytes);
2177 	p = xdr_decode_size3(p, &result->abytes);
2178 	p = xdr_decode_size3(p, &result->tfiles);
2179 	p = xdr_decode_size3(p, &result->ffiles);
2180 	xdr_decode_size3(p, &result->afiles);
2181 	/* ignore invarsec */
2182 	return 0;
2183 out_overflow:
2184 	print_overflow_msg(__func__, xdr);
2185 	return -EIO;
2186 }
2187 
2188 static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req,
2189 				   struct xdr_stream *xdr,
2190 				   void *data)
2191 {
2192 	struct nfs_fsstat *result = data;
2193 	enum nfs_stat status;
2194 	int error;
2195 
2196 	error = decode_nfsstat3(xdr, &status);
2197 	if (unlikely(error))
2198 		goto out;
2199 	error = decode_post_op_attr(xdr, result->fattr);
2200 	if (unlikely(error))
2201 		goto out;
2202 	if (status != NFS3_OK)
2203 		goto out_status;
2204 	error = decode_fsstat3resok(xdr, result);
2205 out:
2206 	return error;
2207 out_status:
2208 	return nfs3_stat_to_errno(status);
2209 }
2210 
2211 /*
2212  * 3.3.19  FSINFO3res
2213  *
2214  *	struct FSINFO3resok {
2215  *		post_op_attr	obj_attributes;
2216  *		uint32		rtmax;
2217  *		uint32		rtpref;
2218  *		uint32		rtmult;
2219  *		uint32		wtmax;
2220  *		uint32		wtpref;
2221  *		uint32		wtmult;
2222  *		uint32		dtpref;
2223  *		size3		maxfilesize;
2224  *		nfstime3	time_delta;
2225  *		uint32		properties;
2226  *	};
2227  *
2228  *	struct FSINFO3resfail {
2229  *		post_op_attr	obj_attributes;
2230  *	};
2231  *
2232  *	union FSINFO3res switch (nfsstat3 status) {
2233  *	case NFS3_OK:
2234  *		FSINFO3resok	resok;
2235  *	default:
2236  *		FSINFO3resfail	resfail;
2237  *	};
2238  */
2239 static int decode_fsinfo3resok(struct xdr_stream *xdr,
2240 			       struct nfs_fsinfo *result)
2241 {
2242 	__be32 *p;
2243 
2244 	p = xdr_inline_decode(xdr, 4 * 7 + 8 + 8 + 4);
2245 	if (unlikely(p == NULL))
2246 		goto out_overflow;
2247 	result->rtmax  = be32_to_cpup(p++);
2248 	result->rtpref = be32_to_cpup(p++);
2249 	result->rtmult = be32_to_cpup(p++);
2250 	result->wtmax  = be32_to_cpup(p++);
2251 	result->wtpref = be32_to_cpup(p++);
2252 	result->wtmult = be32_to_cpup(p++);
2253 	result->dtpref = be32_to_cpup(p++);
2254 	p = xdr_decode_size3(p, &result->maxfilesize);
2255 	xdr_decode_nfstime3(p, &result->time_delta);
2256 
2257 	/* ignore properties */
2258 	result->lease_time = 0;
2259 	return 0;
2260 out_overflow:
2261 	print_overflow_msg(__func__, xdr);
2262 	return -EIO;
2263 }
2264 
2265 static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req,
2266 				   struct xdr_stream *xdr,
2267 				   void *data)
2268 {
2269 	struct nfs_fsinfo *result = data;
2270 	enum nfs_stat status;
2271 	int error;
2272 
2273 	error = decode_nfsstat3(xdr, &status);
2274 	if (unlikely(error))
2275 		goto out;
2276 	error = decode_post_op_attr(xdr, result->fattr);
2277 	if (unlikely(error))
2278 		goto out;
2279 	if (status != NFS3_OK)
2280 		goto out_status;
2281 	error = decode_fsinfo3resok(xdr, result);
2282 out:
2283 	return error;
2284 out_status:
2285 	return nfs3_stat_to_errno(status);
2286 }
2287 
2288 /*
2289  * 3.3.20  PATHCONF3res
2290  *
2291  *	struct PATHCONF3resok {
2292  *		post_op_attr	obj_attributes;
2293  *		uint32		linkmax;
2294  *		uint32		name_max;
2295  *		bool		no_trunc;
2296  *		bool		chown_restricted;
2297  *		bool		case_insensitive;
2298  *		bool		case_preserving;
2299  *	};
2300  *
2301  *	struct PATHCONF3resfail {
2302  *		post_op_attr	obj_attributes;
2303  *	};
2304  *
2305  *	union PATHCONF3res switch (nfsstat3 status) {
2306  *	case NFS3_OK:
2307  *		PATHCONF3resok	resok;
2308  *	default:
2309  *		PATHCONF3resfail resfail;
2310  *	};
2311  */
2312 static int decode_pathconf3resok(struct xdr_stream *xdr,
2313 				 struct nfs_pathconf *result)
2314 {
2315 	__be32 *p;
2316 
2317 	p = xdr_inline_decode(xdr, 4 * 6);
2318 	if (unlikely(p == NULL))
2319 		goto out_overflow;
2320 	result->max_link = be32_to_cpup(p++);
2321 	result->max_namelen = be32_to_cpup(p);
2322 	/* ignore remaining fields */
2323 	return 0;
2324 out_overflow:
2325 	print_overflow_msg(__func__, xdr);
2326 	return -EIO;
2327 }
2328 
2329 static int nfs3_xdr_dec_pathconf3res(struct rpc_rqst *req,
2330 				     struct xdr_stream *xdr,
2331 				     void *data)
2332 {
2333 	struct nfs_pathconf *result = data;
2334 	enum nfs_stat status;
2335 	int error;
2336 
2337 	error = decode_nfsstat3(xdr, &status);
2338 	if (unlikely(error))
2339 		goto out;
2340 	error = decode_post_op_attr(xdr, result->fattr);
2341 	if (unlikely(error))
2342 		goto out;
2343 	if (status != NFS3_OK)
2344 		goto out_status;
2345 	error = decode_pathconf3resok(xdr, result);
2346 out:
2347 	return error;
2348 out_status:
2349 	return nfs3_stat_to_errno(status);
2350 }
2351 
2352 /*
2353  * 3.3.21  COMMIT3res
2354  *
2355  *	struct COMMIT3resok {
2356  *		wcc_data	file_wcc;
2357  *		writeverf3	verf;
2358  *	};
2359  *
2360  *	struct COMMIT3resfail {
2361  *		wcc_data	file_wcc;
2362  *	};
2363  *
2364  *	union COMMIT3res switch (nfsstat3 status) {
2365  *	case NFS3_OK:
2366  *		COMMIT3resok	resok;
2367  *	default:
2368  *		COMMIT3resfail	resfail;
2369  *	};
2370  */
2371 static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req,
2372 				   struct xdr_stream *xdr,
2373 				   void *data)
2374 {
2375 	struct nfs_commitres *result = data;
2376 	enum nfs_stat status;
2377 	int error;
2378 
2379 	error = decode_nfsstat3(xdr, &status);
2380 	if (unlikely(error))
2381 		goto out;
2382 	error = decode_wcc_data(xdr, result->fattr);
2383 	if (unlikely(error))
2384 		goto out;
2385 	result->op_status = status;
2386 	if (status != NFS3_OK)
2387 		goto out_status;
2388 	error = decode_writeverf3(xdr, &result->verf->verifier);
2389 out:
2390 	return error;
2391 out_status:
2392 	return nfs3_stat_to_errno(status);
2393 }
2394 
2395 #ifdef CONFIG_NFS_V3_ACL
2396 
2397 static inline int decode_getacl3resok(struct xdr_stream *xdr,
2398 				      struct nfs3_getaclres *result)
2399 {
2400 	struct posix_acl **acl;
2401 	unsigned int *aclcnt;
2402 	size_t hdrlen;
2403 	int error;
2404 
2405 	error = decode_post_op_attr(xdr, result->fattr);
2406 	if (unlikely(error))
2407 		goto out;
2408 	error = decode_uint32(xdr, &result->mask);
2409 	if (unlikely(error))
2410 		goto out;
2411 	error = -EINVAL;
2412 	if (result->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
2413 		goto out;
2414 
2415 	hdrlen = xdr_stream_pos(xdr);
2416 
2417 	acl = NULL;
2418 	if (result->mask & NFS_ACL)
2419 		acl = &result->acl_access;
2420 	aclcnt = NULL;
2421 	if (result->mask & NFS_ACLCNT)
2422 		aclcnt = &result->acl_access_count;
2423 	error = nfsacl_decode(xdr->buf, hdrlen, aclcnt, acl);
2424 	if (unlikely(error <= 0))
2425 		goto out;
2426 
2427 	acl = NULL;
2428 	if (result->mask & NFS_DFACL)
2429 		acl = &result->acl_default;
2430 	aclcnt = NULL;
2431 	if (result->mask & NFS_DFACLCNT)
2432 		aclcnt = &result->acl_default_count;
2433 	error = nfsacl_decode(xdr->buf, hdrlen + error, aclcnt, acl);
2434 	if (unlikely(error <= 0))
2435 		return error;
2436 	error = 0;
2437 out:
2438 	return error;
2439 }
2440 
2441 static int nfs3_xdr_dec_getacl3res(struct rpc_rqst *req,
2442 				   struct xdr_stream *xdr,
2443 				   void *result)
2444 {
2445 	enum nfs_stat status;
2446 	int error;
2447 
2448 	error = decode_nfsstat3(xdr, &status);
2449 	if (unlikely(error))
2450 		goto out;
2451 	if (status != NFS3_OK)
2452 		goto out_default;
2453 	error = decode_getacl3resok(xdr, result);
2454 out:
2455 	return error;
2456 out_default:
2457 	return nfs3_stat_to_errno(status);
2458 }
2459 
2460 static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req,
2461 				   struct xdr_stream *xdr,
2462 				   void *result)
2463 {
2464 	enum nfs_stat status;
2465 	int error;
2466 
2467 	error = decode_nfsstat3(xdr, &status);
2468 	if (unlikely(error))
2469 		goto out;
2470 	if (status != NFS3_OK)
2471 		goto out_default;
2472 	error = decode_post_op_attr(xdr, result);
2473 out:
2474 	return error;
2475 out_default:
2476 	return nfs3_stat_to_errno(status);
2477 }
2478 
2479 #endif  /* CONFIG_NFS_V3_ACL */
2480 
2481 
2482 /*
2483  * We need to translate between nfs status return values and
2484  * the local errno values which may not be the same.
2485  */
2486 static const struct {
2487 	int stat;
2488 	int errno;
2489 } nfs_errtbl[] = {
2490 	{ NFS_OK,		0		},
2491 	{ NFSERR_PERM,		-EPERM		},
2492 	{ NFSERR_NOENT,		-ENOENT		},
2493 	{ NFSERR_IO,		-errno_NFSERR_IO},
2494 	{ NFSERR_NXIO,		-ENXIO		},
2495 /*	{ NFSERR_EAGAIN,	-EAGAIN		}, */
2496 	{ NFSERR_ACCES,		-EACCES		},
2497 	{ NFSERR_EXIST,		-EEXIST		},
2498 	{ NFSERR_XDEV,		-EXDEV		},
2499 	{ NFSERR_NODEV,		-ENODEV		},
2500 	{ NFSERR_NOTDIR,	-ENOTDIR	},
2501 	{ NFSERR_ISDIR,		-EISDIR		},
2502 	{ NFSERR_INVAL,		-EINVAL		},
2503 	{ NFSERR_FBIG,		-EFBIG		},
2504 	{ NFSERR_NOSPC,		-ENOSPC		},
2505 	{ NFSERR_ROFS,		-EROFS		},
2506 	{ NFSERR_MLINK,		-EMLINK		},
2507 	{ NFSERR_NAMETOOLONG,	-ENAMETOOLONG	},
2508 	{ NFSERR_NOTEMPTY,	-ENOTEMPTY	},
2509 	{ NFSERR_DQUOT,		-EDQUOT		},
2510 	{ NFSERR_STALE,		-ESTALE		},
2511 	{ NFSERR_REMOTE,	-EREMOTE	},
2512 #ifdef EWFLUSH
2513 	{ NFSERR_WFLUSH,	-EWFLUSH	},
2514 #endif
2515 	{ NFSERR_BADHANDLE,	-EBADHANDLE	},
2516 	{ NFSERR_NOT_SYNC,	-ENOTSYNC	},
2517 	{ NFSERR_BAD_COOKIE,	-EBADCOOKIE	},
2518 	{ NFSERR_NOTSUPP,	-ENOTSUPP	},
2519 	{ NFSERR_TOOSMALL,	-ETOOSMALL	},
2520 	{ NFSERR_SERVERFAULT,	-EREMOTEIO	},
2521 	{ NFSERR_BADTYPE,	-EBADTYPE	},
2522 	{ NFSERR_JUKEBOX,	-EJUKEBOX	},
2523 	{ -1,			-EIO		}
2524 };
2525 
2526 /**
2527  * nfs3_stat_to_errno - convert an NFS status code to a local errno
2528  * @status: NFS status code to convert
2529  *
2530  * Returns a local errno value, or -EIO if the NFS status code is
2531  * not recognized.  This function is used jointly by NFSv2 and NFSv3.
2532  */
2533 static int nfs3_stat_to_errno(enum nfs_stat status)
2534 {
2535 	int i;
2536 
2537 	for (i = 0; nfs_errtbl[i].stat != -1; i++) {
2538 		if (nfs_errtbl[i].stat == (int)status)
2539 			return nfs_errtbl[i].errno;
2540 	}
2541 	dprintk("NFS: Unrecognized nfs status value: %u\n", status);
2542 	return nfs_errtbl[i].errno;
2543 }
2544 
2545 
2546 #define PROC(proc, argtype, restype, timer)				\
2547 [NFS3PROC_##proc] = {							\
2548 	.p_proc      = NFS3PROC_##proc,					\
2549 	.p_encode    = nfs3_xdr_enc_##argtype##3args,			\
2550 	.p_decode    = nfs3_xdr_dec_##restype##3res,			\
2551 	.p_arglen    = NFS3_##argtype##args_sz,				\
2552 	.p_replen    = NFS3_##restype##res_sz,				\
2553 	.p_timer     = timer,						\
2554 	.p_statidx   = NFS3PROC_##proc,					\
2555 	.p_name      = #proc,						\
2556 	}
2557 
2558 const struct rpc_procinfo nfs3_procedures[] = {
2559 	PROC(GETATTR,		getattr,	getattr,	1),
2560 	PROC(SETATTR,		setattr,	setattr,	0),
2561 	PROC(LOOKUP,		lookup,		lookup,		2),
2562 	PROC(ACCESS,		access,		access,		1),
2563 	PROC(READLINK,		readlink,	readlink,	3),
2564 	PROC(READ,		read,		read,		3),
2565 	PROC(WRITE,		write,		write,		4),
2566 	PROC(CREATE,		create,		create,		0),
2567 	PROC(MKDIR,		mkdir,		create,		0),
2568 	PROC(SYMLINK,		symlink,	create,		0),
2569 	PROC(MKNOD,		mknod,		create,		0),
2570 	PROC(REMOVE,		remove,		remove,		0),
2571 	PROC(RMDIR,		lookup,		setattr,	0),
2572 	PROC(RENAME,		rename,		rename,		0),
2573 	PROC(LINK,		link,		link,		0),
2574 	PROC(READDIR,		readdir,	readdir,	3),
2575 	PROC(READDIRPLUS,	readdirplus,	readdir,	3),
2576 	PROC(FSSTAT,		getattr,	fsstat,		0),
2577 	PROC(FSINFO,		getattr,	fsinfo,		0),
2578 	PROC(PATHCONF,		getattr,	pathconf,	0),
2579 	PROC(COMMIT,		commit,		commit,		5),
2580 };
2581 
2582 static unsigned int nfs_version3_counts[ARRAY_SIZE(nfs3_procedures)];
2583 const struct rpc_version nfs_version3 = {
2584 	.number			= 3,
2585 	.nrprocs		= ARRAY_SIZE(nfs3_procedures),
2586 	.procs			= nfs3_procedures,
2587 	.counts			= nfs_version3_counts,
2588 };
2589 
2590 #ifdef CONFIG_NFS_V3_ACL
2591 static const struct rpc_procinfo nfs3_acl_procedures[] = {
2592 	[ACLPROC3_GETACL] = {
2593 		.p_proc = ACLPROC3_GETACL,
2594 		.p_encode = nfs3_xdr_enc_getacl3args,
2595 		.p_decode = nfs3_xdr_dec_getacl3res,
2596 		.p_arglen = ACL3_getaclargs_sz,
2597 		.p_replen = ACL3_getaclres_sz,
2598 		.p_timer = 1,
2599 		.p_name = "GETACL",
2600 	},
2601 	[ACLPROC3_SETACL] = {
2602 		.p_proc = ACLPROC3_SETACL,
2603 		.p_encode = nfs3_xdr_enc_setacl3args,
2604 		.p_decode = nfs3_xdr_dec_setacl3res,
2605 		.p_arglen = ACL3_setaclargs_sz,
2606 		.p_replen = ACL3_setaclres_sz,
2607 		.p_timer = 0,
2608 		.p_name = "SETACL",
2609 	},
2610 };
2611 
2612 static unsigned int nfs3_acl_counts[ARRAY_SIZE(nfs3_acl_procedures)];
2613 const struct rpc_version nfsacl_version3 = {
2614 	.number			= 3,
2615 	.nrprocs		= ARRAY_SIZE(nfs3_acl_procedures),
2616 	.procs			= nfs3_acl_procedures,
2617 	.counts			= nfs3_acl_counts,
2618 };
2619 #endif  /* CONFIG_NFS_V3_ACL */
2620