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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
90static int nfs3_stat_to_errno(enum nfs_stat);
91
92/*
93 * Map file type to S_IFMT bits
94 */
95static 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 */
110static 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 */
124static 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
143static 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
149static 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;
158out_overflow:
159 print_overflow_msg(__func__, xdr);
160 return -EIO;
161}
162
163static 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;
172out_overflow:
173 print_overflow_msg(__func__, xdr);
174 return -EIO;
175}
176
177/*
178 * fileid3
179 *
180 * typedef uint64 fileid3;
181 */
182static __be32 *xdr_decode_fileid3(__be32 *p, u64 *fileid)
183{
184 return xdr_decode_hyper(p, fileid);
185}
186
187static 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 */
197static 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
207static 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
226out_nametoolong:
227 dprintk("NFS: returned filename too long: %u\n", count);
228 return -ENAMETOOLONG;
229out_overflow:
230 print_overflow_msg(__func__, xdr);
231 return -EIO;
232}
233
234/*
235 * nfspath3
236 *
237 * typedef string nfspath3<>;
238 */
239static 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
246static 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
263out_nametoolong:
264 dprintk("NFS: returned pathname too long: %u\n", count);
265 return -ENAMETOOLONG;
266out_cheating:
267 dprintk("NFS: server cheating in pathname result: "
268 "count %u > recvd %u\n", count, recvd);
269 return -EIO;
270out_overflow:
271 print_overflow_msg(__func__, xdr);
272 return -EIO;
273}
274
275/*
276 * cookie3
277 *
278 * typedef uint64 cookie3
279 */
280static __be32 *xdr_encode_cookie3(__be32 *p, u64 cookie)
281{
282 return xdr_encode_hyper(p, cookie);
283}
284
285static 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 */
295static __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
301static 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;
310out_overflow:
311 print_overflow_msg(__func__, xdr);
312 return -EIO;
313}
314
315/*
316 * createverf3
317 *
318 * typedef opaque createverf3[NFS3_CREATEVERFSIZE];
319 */
320static 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
328static 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;
337out_overflow:
338 print_overflow_msg(__func__, xdr);
339 return -EIO;
340}
341
342/*
343 * size3
344 *
345 * typedef uint64 size3;
346 */
347static __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
362static 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;
371out_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 */
389static void encode_ftype3(struct xdr_stream *xdr, const u32 type)
390{
391 encode_uint32(xdr, type);
392}
393
394static __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 */
413static 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
422static __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 */
441static 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
450static 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;
467out_toobig:
468 dprintk("NFS: file handle size (%u) too big\n", length);
469 return -E2BIG;
470out_overflow:
471 print_overflow_msg(__func__, xdr);
472 return -EIO;
473}
474
475static 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 */
488static __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
495static __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 */
562static 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 */
648static 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;
683out_uid:
684 dprintk("NFS: returned invalid uid\n");
685 return -EINVAL;
686out_gid:
687 dprintk("NFS: returned invalid gid\n");
688 return -EINVAL;
689out_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 */
704static 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;
714out_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 */
727static 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;
746out_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 */
767static 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;
777out_overflow:
778 print_overflow_msg(__func__, xdr);
779 return -EIO;
780}
781
782static 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);
790out:
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 */
804static 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;
813out_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 */
826static 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 */
848static 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 */
873static 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
888static 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 */
905static 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 */
922static 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
929static 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 */
945static 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 */
965static 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
977static 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 */
1006static 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
1021static 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 */
1053static 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
1070static 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 */
1088static 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 */
1111static 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
1120static 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 */
1155static 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
1162static 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
1183static 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 */
1200static 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 */
1217static 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 */
1237static 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 */
1257static 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
1270static 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 */
1292static 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
1312static 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 */
1332static 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
1344static 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
1355static 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
1369static 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 */
1421static 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);
1434out:
1435 return error;
1436out_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 */
1458static 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;
1473out:
1474 return error;
1475out_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 */
1499static 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);
1519out:
1520 return error;
1521out_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 */
1547static 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);
1564out:
1565 return error;
1566out_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 */
1589static 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);
1605out:
1606 return error;
1607out_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 */
1632static 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;
1649out:
1650 result->eof = eof;
1651 result->count = count;
1652 return count;
1653out_mismatch:
1654 dprintk("NFS: READ count doesn't match length of opaque: "
1655 "count %u != ocount %u\n", count, ocount);
1656 return -EIO;
1657out_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;
1663out_overflow:
1664 print_overflow_msg(__func__, xdr);
1665 return -EIO;
1666}
1667
1668static 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);
1685out:
1686 return error;
1687out_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 */
1718static 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;
1733out_badvalue:
1734 dprintk("NFS: bad stable_how value: %u\n", result->verf->committed);
1735 return -EIO;
1736out_overflow:
1737 print_overflow_msg(__func__, xdr);
1738out_eio:
1739 return -EIO;
1740}
1741
1742static 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);
1759out:
1760 return error;
1761out_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 */
1785static 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);
1803out:
1804 return error;
1805}
1806
1807static 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);
1821out:
1822 return error;
1823out_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 */
1848static 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;
1864out:
1865 return error;
1866out_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 */
1890static 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;
1909out:
1910 return error;
1911out_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 */
1935static 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;
1953out:
1954 return error;
1955out_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 */
1994int 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 u64 new_cookie;
2001
2002 p = xdr_inline_decode(xdr, 4);
2003 if (unlikely(p == NULL))
2004 goto out_overflow;
2005 if (*p == xdr_zero) {
2006 p = xdr_inline_decode(xdr, 4);
2007 if (unlikely(p == NULL))
2008 goto out_overflow;
2009 if (*p == xdr_zero)
2010 return -EAGAIN;
2011 entry->eof = 1;
2012 return -EBADCOOKIE;
2013 }
2014
2015 error = decode_fileid3(xdr, &entry->ino);
2016 if (unlikely(error))
2017 return error;
2018
2019 error = decode_inline_filename3(xdr, &entry->name, &entry->len);
2020 if (unlikely(error))
2021 return error;
2022
2023 error = decode_cookie3(xdr, &new_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 entry->prev_cookie = entry->cookie;
2058 entry->cookie = new_cookie;
2059
2060 return 0;
2061
2062out_overflow:
2063 print_overflow_msg(__func__, xdr);
2064 return -EAGAIN;
2065out_truncated:
2066 dprintk("NFS: directory entry contains invalid file handle\n");
2067 *entry = old;
2068 return -EAGAIN;
2069}
2070
2071/*
2072 * 3.3.16 READDIR3res
2073 *
2074 * struct dirlist3 {
2075 * entry3 *entries;
2076 * bool eof;
2077 * };
2078 *
2079 * struct READDIR3resok {
2080 * post_op_attr dir_attributes;
2081 * cookieverf3 cookieverf;
2082 * dirlist3 reply;
2083 * };
2084 *
2085 * struct READDIR3resfail {
2086 * post_op_attr dir_attributes;
2087 * };
2088 *
2089 * union READDIR3res switch (nfsstat3 status) {
2090 * case NFS3_OK:
2091 * READDIR3resok resok;
2092 * default:
2093 * READDIR3resfail resfail;
2094 * };
2095 *
2096 * Read the directory contents into the page cache, but otherwise
2097 * don't touch them. The actual decoding is done by nfs3_decode_entry()
2098 * during subsequent nfs_readdir() calls.
2099 */
2100static int decode_dirlist3(struct xdr_stream *xdr)
2101{
2102 return xdr_read_pages(xdr, xdr->buf->page_len);
2103}
2104
2105static int decode_readdir3resok(struct xdr_stream *xdr,
2106 struct nfs3_readdirres *result)
2107{
2108 int error;
2109
2110 error = decode_post_op_attr(xdr, result->dir_attr);
2111 if (unlikely(error))
2112 goto out;
2113 /* XXX: do we need to check if result->verf != NULL ? */
2114 error = decode_cookieverf3(xdr, result->verf);
2115 if (unlikely(error))
2116 goto out;
2117 error = decode_dirlist3(xdr);
2118out:
2119 return error;
2120}
2121
2122static int nfs3_xdr_dec_readdir3res(struct rpc_rqst *req,
2123 struct xdr_stream *xdr,
2124 void *data)
2125{
2126 struct nfs3_readdirres *result = data;
2127 enum nfs_stat status;
2128 int error;
2129
2130 error = decode_nfsstat3(xdr, &status);
2131 if (unlikely(error))
2132 goto out;
2133 if (status != NFS3_OK)
2134 goto out_default;
2135 error = decode_readdir3resok(xdr, result);
2136out:
2137 return error;
2138out_default:
2139 error = decode_post_op_attr(xdr, result->dir_attr);
2140 if (unlikely(error))
2141 goto out;
2142 return nfs3_stat_to_errno(status);
2143}
2144
2145/*
2146 * 3.3.18 FSSTAT3res
2147 *
2148 * struct FSSTAT3resok {
2149 * post_op_attr obj_attributes;
2150 * size3 tbytes;
2151 * size3 fbytes;
2152 * size3 abytes;
2153 * size3 tfiles;
2154 * size3 ffiles;
2155 * size3 afiles;
2156 * uint32 invarsec;
2157 * };
2158 *
2159 * struct FSSTAT3resfail {
2160 * post_op_attr obj_attributes;
2161 * };
2162 *
2163 * union FSSTAT3res switch (nfsstat3 status) {
2164 * case NFS3_OK:
2165 * FSSTAT3resok resok;
2166 * default:
2167 * FSSTAT3resfail resfail;
2168 * };
2169 */
2170static int decode_fsstat3resok(struct xdr_stream *xdr,
2171 struct nfs_fsstat *result)
2172{
2173 __be32 *p;
2174
2175 p = xdr_inline_decode(xdr, 8 * 6 + 4);
2176 if (unlikely(p == NULL))
2177 goto out_overflow;
2178 p = xdr_decode_size3(p, &result->tbytes);
2179 p = xdr_decode_size3(p, &result->fbytes);
2180 p = xdr_decode_size3(p, &result->abytes);
2181 p = xdr_decode_size3(p, &result->tfiles);
2182 p = xdr_decode_size3(p, &result->ffiles);
2183 xdr_decode_size3(p, &result->afiles);
2184 /* ignore invarsec */
2185 return 0;
2186out_overflow:
2187 print_overflow_msg(__func__, xdr);
2188 return -EIO;
2189}
2190
2191static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req,
2192 struct xdr_stream *xdr,
2193 void *data)
2194{
2195 struct nfs_fsstat *result = data;
2196 enum nfs_stat status;
2197 int error;
2198
2199 error = decode_nfsstat3(xdr, &status);
2200 if (unlikely(error))
2201 goto out;
2202 error = decode_post_op_attr(xdr, result->fattr);
2203 if (unlikely(error))
2204 goto out;
2205 if (status != NFS3_OK)
2206 goto out_status;
2207 error = decode_fsstat3resok(xdr, result);
2208out:
2209 return error;
2210out_status:
2211 return nfs3_stat_to_errno(status);
2212}
2213
2214/*
2215 * 3.3.19 FSINFO3res
2216 *
2217 * struct FSINFO3resok {
2218 * post_op_attr obj_attributes;
2219 * uint32 rtmax;
2220 * uint32 rtpref;
2221 * uint32 rtmult;
2222 * uint32 wtmax;
2223 * uint32 wtpref;
2224 * uint32 wtmult;
2225 * uint32 dtpref;
2226 * size3 maxfilesize;
2227 * nfstime3 time_delta;
2228 * uint32 properties;
2229 * };
2230 *
2231 * struct FSINFO3resfail {
2232 * post_op_attr obj_attributes;
2233 * };
2234 *
2235 * union FSINFO3res switch (nfsstat3 status) {
2236 * case NFS3_OK:
2237 * FSINFO3resok resok;
2238 * default:
2239 * FSINFO3resfail resfail;
2240 * };
2241 */
2242static int decode_fsinfo3resok(struct xdr_stream *xdr,
2243 struct nfs_fsinfo *result)
2244{
2245 __be32 *p;
2246
2247 p = xdr_inline_decode(xdr, 4 * 7 + 8 + 8 + 4);
2248 if (unlikely(p == NULL))
2249 goto out_overflow;
2250 result->rtmax = be32_to_cpup(p++);
2251 result->rtpref = be32_to_cpup(p++);
2252 result->rtmult = be32_to_cpup(p++);
2253 result->wtmax = be32_to_cpup(p++);
2254 result->wtpref = be32_to_cpup(p++);
2255 result->wtmult = be32_to_cpup(p++);
2256 result->dtpref = be32_to_cpup(p++);
2257 p = xdr_decode_size3(p, &result->maxfilesize);
2258 xdr_decode_nfstime3(p, &result->time_delta);
2259
2260 /* ignore properties */
2261 result->lease_time = 0;
2262 return 0;
2263out_overflow:
2264 print_overflow_msg(__func__, xdr);
2265 return -EIO;
2266}
2267
2268static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req,
2269 struct xdr_stream *xdr,
2270 void *data)
2271{
2272 struct nfs_fsinfo *result = data;
2273 enum nfs_stat status;
2274 int error;
2275
2276 error = decode_nfsstat3(xdr, &status);
2277 if (unlikely(error))
2278 goto out;
2279 error = decode_post_op_attr(xdr, result->fattr);
2280 if (unlikely(error))
2281 goto out;
2282 if (status != NFS3_OK)
2283 goto out_status;
2284 error = decode_fsinfo3resok(xdr, result);
2285out:
2286 return error;
2287out_status:
2288 return nfs3_stat_to_errno(status);
2289}
2290
2291/*
2292 * 3.3.20 PATHCONF3res
2293 *
2294 * struct PATHCONF3resok {
2295 * post_op_attr obj_attributes;
2296 * uint32 linkmax;
2297 * uint32 name_max;
2298 * bool no_trunc;
2299 * bool chown_restricted;
2300 * bool case_insensitive;
2301 * bool case_preserving;
2302 * };
2303 *
2304 * struct PATHCONF3resfail {
2305 * post_op_attr obj_attributes;
2306 * };
2307 *
2308 * union PATHCONF3res switch (nfsstat3 status) {
2309 * case NFS3_OK:
2310 * PATHCONF3resok resok;
2311 * default:
2312 * PATHCONF3resfail resfail;
2313 * };
2314 */
2315static int decode_pathconf3resok(struct xdr_stream *xdr,
2316 struct nfs_pathconf *result)
2317{
2318 __be32 *p;
2319
2320 p = xdr_inline_decode(xdr, 4 * 6);
2321 if (unlikely(p == NULL))
2322 goto out_overflow;
2323 result->max_link = be32_to_cpup(p++);
2324 result->max_namelen = be32_to_cpup(p);
2325 /* ignore remaining fields */
2326 return 0;
2327out_overflow:
2328 print_overflow_msg(__func__, xdr);
2329 return -EIO;
2330}
2331
2332static int nfs3_xdr_dec_pathconf3res(struct rpc_rqst *req,
2333 struct xdr_stream *xdr,
2334 void *data)
2335{
2336 struct nfs_pathconf *result = data;
2337 enum nfs_stat status;
2338 int error;
2339
2340 error = decode_nfsstat3(xdr, &status);
2341 if (unlikely(error))
2342 goto out;
2343 error = decode_post_op_attr(xdr, result->fattr);
2344 if (unlikely(error))
2345 goto out;
2346 if (status != NFS3_OK)
2347 goto out_status;
2348 error = decode_pathconf3resok(xdr, result);
2349out:
2350 return error;
2351out_status:
2352 return nfs3_stat_to_errno(status);
2353}
2354
2355/*
2356 * 3.3.21 COMMIT3res
2357 *
2358 * struct COMMIT3resok {
2359 * wcc_data file_wcc;
2360 * writeverf3 verf;
2361 * };
2362 *
2363 * struct COMMIT3resfail {
2364 * wcc_data file_wcc;
2365 * };
2366 *
2367 * union COMMIT3res switch (nfsstat3 status) {
2368 * case NFS3_OK:
2369 * COMMIT3resok resok;
2370 * default:
2371 * COMMIT3resfail resfail;
2372 * };
2373 */
2374static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req,
2375 struct xdr_stream *xdr,
2376 void *data)
2377{
2378 struct nfs_commitres *result = data;
2379 enum nfs_stat status;
2380 int error;
2381
2382 error = decode_nfsstat3(xdr, &status);
2383 if (unlikely(error))
2384 goto out;
2385 error = decode_wcc_data(xdr, result->fattr);
2386 if (unlikely(error))
2387 goto out;
2388 result->op_status = status;
2389 if (status != NFS3_OK)
2390 goto out_status;
2391 error = decode_writeverf3(xdr, &result->verf->verifier);
2392out:
2393 return error;
2394out_status:
2395 return nfs3_stat_to_errno(status);
2396}
2397
2398#ifdef CONFIG_NFS_V3_ACL
2399
2400static inline int decode_getacl3resok(struct xdr_stream *xdr,
2401 struct nfs3_getaclres *result)
2402{
2403 struct posix_acl **acl;
2404 unsigned int *aclcnt;
2405 size_t hdrlen;
2406 int error;
2407
2408 error = decode_post_op_attr(xdr, result->fattr);
2409 if (unlikely(error))
2410 goto out;
2411 error = decode_uint32(xdr, &result->mask);
2412 if (unlikely(error))
2413 goto out;
2414 error = -EINVAL;
2415 if (result->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
2416 goto out;
2417
2418 hdrlen = xdr_stream_pos(xdr);
2419
2420 acl = NULL;
2421 if (result->mask & NFS_ACL)
2422 acl = &result->acl_access;
2423 aclcnt = NULL;
2424 if (result->mask & NFS_ACLCNT)
2425 aclcnt = &result->acl_access_count;
2426 error = nfsacl_decode(xdr->buf, hdrlen, aclcnt, acl);
2427 if (unlikely(error <= 0))
2428 goto out;
2429
2430 acl = NULL;
2431 if (result->mask & NFS_DFACL)
2432 acl = &result->acl_default;
2433 aclcnt = NULL;
2434 if (result->mask & NFS_DFACLCNT)
2435 aclcnt = &result->acl_default_count;
2436 error = nfsacl_decode(xdr->buf, hdrlen + error, aclcnt, acl);
2437 if (unlikely(error <= 0))
2438 return error;
2439 error = 0;
2440out:
2441 return error;
2442}
2443
2444static int nfs3_xdr_dec_getacl3res(struct rpc_rqst *req,
2445 struct xdr_stream *xdr,
2446 void *result)
2447{
2448 enum nfs_stat status;
2449 int error;
2450
2451 error = decode_nfsstat3(xdr, &status);
2452 if (unlikely(error))
2453 goto out;
2454 if (status != NFS3_OK)
2455 goto out_default;
2456 error = decode_getacl3resok(xdr, result);
2457out:
2458 return error;
2459out_default:
2460 return nfs3_stat_to_errno(status);
2461}
2462
2463static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req,
2464 struct xdr_stream *xdr,
2465 void *result)
2466{
2467 enum nfs_stat status;
2468 int error;
2469
2470 error = decode_nfsstat3(xdr, &status);
2471 if (unlikely(error))
2472 goto out;
2473 if (status != NFS3_OK)
2474 goto out_default;
2475 error = decode_post_op_attr(xdr, result);
2476out:
2477 return error;
2478out_default:
2479 return nfs3_stat_to_errno(status);
2480}
2481
2482#endif /* CONFIG_NFS_V3_ACL */
2483
2484
2485/*
2486 * We need to translate between nfs status return values and
2487 * the local errno values which may not be the same.
2488 */
2489static const struct {
2490 int stat;
2491 int errno;
2492} nfs_errtbl[] = {
2493 { NFS_OK, 0 },
2494 { NFSERR_PERM, -EPERM },
2495 { NFSERR_NOENT, -ENOENT },
2496 { NFSERR_IO, -errno_NFSERR_IO},
2497 { NFSERR_NXIO, -ENXIO },
2498/* { NFSERR_EAGAIN, -EAGAIN }, */
2499 { NFSERR_ACCES, -EACCES },
2500 { NFSERR_EXIST, -EEXIST },
2501 { NFSERR_XDEV, -EXDEV },
2502 { NFSERR_NODEV, -ENODEV },
2503 { NFSERR_NOTDIR, -ENOTDIR },
2504 { NFSERR_ISDIR, -EISDIR },
2505 { NFSERR_INVAL, -EINVAL },
2506 { NFSERR_FBIG, -EFBIG },
2507 { NFSERR_NOSPC, -ENOSPC },
2508 { NFSERR_ROFS, -EROFS },
2509 { NFSERR_MLINK, -EMLINK },
2510 { NFSERR_NAMETOOLONG, -ENAMETOOLONG },
2511 { NFSERR_NOTEMPTY, -ENOTEMPTY },
2512 { NFSERR_DQUOT, -EDQUOT },
2513 { NFSERR_STALE, -ESTALE },
2514 { NFSERR_REMOTE, -EREMOTE },
2515#ifdef EWFLUSH
2516 { NFSERR_WFLUSH, -EWFLUSH },
2517#endif
2518 { NFSERR_BADHANDLE, -EBADHANDLE },
2519 { NFSERR_NOT_SYNC, -ENOTSYNC },
2520 { NFSERR_BAD_COOKIE, -EBADCOOKIE },
2521 { NFSERR_NOTSUPP, -ENOTSUPP },
2522 { NFSERR_TOOSMALL, -ETOOSMALL },
2523 { NFSERR_SERVERFAULT, -EREMOTEIO },
2524 { NFSERR_BADTYPE, -EBADTYPE },
2525 { NFSERR_JUKEBOX, -EJUKEBOX },
2526 { -1, -EIO }
2527};
2528
2529/**
2530 * nfs3_stat_to_errno - convert an NFS status code to a local errno
2531 * @status: NFS status code to convert
2532 *
2533 * Returns a local errno value, or -EIO if the NFS status code is
2534 * not recognized. This function is used jointly by NFSv2 and NFSv3.
2535 */
2536static int nfs3_stat_to_errno(enum nfs_stat status)
2537{
2538 int i;
2539
2540 for (i = 0; nfs_errtbl[i].stat != -1; i++) {
2541 if (nfs_errtbl[i].stat == (int)status)
2542 return nfs_errtbl[i].errno;
2543 }
2544 dprintk("NFS: Unrecognized nfs status value: %u\n", status);
2545 return nfs_errtbl[i].errno;
2546}
2547
2548
2549#define PROC(proc, argtype, restype, timer) \
2550[NFS3PROC_##proc] = { \
2551 .p_proc = NFS3PROC_##proc, \
2552 .p_encode = nfs3_xdr_enc_##argtype##3args, \
2553 .p_decode = nfs3_xdr_dec_##restype##3res, \
2554 .p_arglen = NFS3_##argtype##args_sz, \
2555 .p_replen = NFS3_##restype##res_sz, \
2556 .p_timer = timer, \
2557 .p_statidx = NFS3PROC_##proc, \
2558 .p_name = #proc, \
2559 }
2560
2561const struct rpc_procinfo nfs3_procedures[] = {
2562 PROC(GETATTR, getattr, getattr, 1),
2563 PROC(SETATTR, setattr, setattr, 0),
2564 PROC(LOOKUP, lookup, lookup, 2),
2565 PROC(ACCESS, access, access, 1),
2566 PROC(READLINK, readlink, readlink, 3),
2567 PROC(READ, read, read, 3),
2568 PROC(WRITE, write, write, 4),
2569 PROC(CREATE, create, create, 0),
2570 PROC(MKDIR, mkdir, create, 0),
2571 PROC(SYMLINK, symlink, create, 0),
2572 PROC(MKNOD, mknod, create, 0),
2573 PROC(REMOVE, remove, remove, 0),
2574 PROC(RMDIR, lookup, setattr, 0),
2575 PROC(RENAME, rename, rename, 0),
2576 PROC(LINK, link, link, 0),
2577 PROC(READDIR, readdir, readdir, 3),
2578 PROC(READDIRPLUS, readdirplus, readdir, 3),
2579 PROC(FSSTAT, getattr, fsstat, 0),
2580 PROC(FSINFO, getattr, fsinfo, 0),
2581 PROC(PATHCONF, getattr, pathconf, 0),
2582 PROC(COMMIT, commit, commit, 5),
2583};
2584
2585static unsigned int nfs_version3_counts[ARRAY_SIZE(nfs3_procedures)];
2586const struct rpc_version nfs_version3 = {
2587 .number = 3,
2588 .nrprocs = ARRAY_SIZE(nfs3_procedures),
2589 .procs = nfs3_procedures,
2590 .counts = nfs_version3_counts,
2591};
2592
2593#ifdef CONFIG_NFS_V3_ACL
2594static const struct rpc_procinfo nfs3_acl_procedures[] = {
2595 [ACLPROC3_GETACL] = {
2596 .p_proc = ACLPROC3_GETACL,
2597 .p_encode = nfs3_xdr_enc_getacl3args,
2598 .p_decode = nfs3_xdr_dec_getacl3res,
2599 .p_arglen = ACL3_getaclargs_sz,
2600 .p_replen = ACL3_getaclres_sz,
2601 .p_timer = 1,
2602 .p_name = "GETACL",
2603 },
2604 [ACLPROC3_SETACL] = {
2605 .p_proc = ACLPROC3_SETACL,
2606 .p_encode = nfs3_xdr_enc_setacl3args,
2607 .p_decode = nfs3_xdr_dec_setacl3res,
2608 .p_arglen = ACL3_setaclargs_sz,
2609 .p_replen = ACL3_setaclres_sz,
2610 .p_timer = 0,
2611 .p_name = "SETACL",
2612 },
2613};
2614
2615static unsigned int nfs3_acl_counts[ARRAY_SIZE(nfs3_acl_procedures)];
2616const struct rpc_version nfsacl_version3 = {
2617 .number = 3,
2618 .nrprocs = ARRAY_SIZE(nfs3_acl_procedures),
2619 .procs = nfs3_acl_procedures,
2620 .counts = nfs3_acl_counts,
2621};
2622#endif /* CONFIG_NFS_V3_ACL */
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 <linux/nfs_common.h>
25
26#include "nfstrace.h"
27#include "internal.h"
28
29#define NFSDBG_FACILITY NFSDBG_XDR
30
31/*
32 * Declare the space requirements for NFS arguments and replies as
33 * number of 32bit-words
34 */
35#define NFS3_pagepad_sz (1) /* Page padding */
36#define NFS3_fhandle_sz (1+16)
37#define NFS3_fh_sz (NFS3_fhandle_sz) /* shorthand */
38#define NFS3_post_op_fh_sz (1+NFS3_fh_sz)
39#define NFS3_sattr_sz (15)
40#define NFS3_filename_sz (1+(NFS3_MAXNAMLEN>>2))
41#define NFS3_path_sz (1+(NFS3_MAXPATHLEN>>2))
42#define NFS3_fattr_sz (21)
43#define NFS3_cookieverf_sz (NFS3_COOKIEVERFSIZE>>2)
44#define NFS3_wcc_attr_sz (6)
45#define NFS3_pre_op_attr_sz (1+NFS3_wcc_attr_sz)
46#define NFS3_post_op_attr_sz (1+NFS3_fattr_sz)
47#define NFS3_wcc_data_sz (NFS3_pre_op_attr_sz+NFS3_post_op_attr_sz)
48#define NFS3_diropargs_sz (NFS3_fh_sz+NFS3_filename_sz)
49
50#define NFS3_getattrargs_sz (NFS3_fh_sz)
51#define NFS3_setattrargs_sz (NFS3_fh_sz+NFS3_sattr_sz+3)
52#define NFS3_lookupargs_sz (NFS3_fh_sz+NFS3_filename_sz)
53#define NFS3_accessargs_sz (NFS3_fh_sz+1)
54#define NFS3_readlinkargs_sz (NFS3_fh_sz)
55#define NFS3_readargs_sz (NFS3_fh_sz+3)
56#define NFS3_writeargs_sz (NFS3_fh_sz+5)
57#define NFS3_createargs_sz (NFS3_diropargs_sz+NFS3_sattr_sz)
58#define NFS3_mkdirargs_sz (NFS3_diropargs_sz+NFS3_sattr_sz)
59#define NFS3_symlinkargs_sz (NFS3_diropargs_sz+1+NFS3_sattr_sz)
60#define NFS3_mknodargs_sz (NFS3_diropargs_sz+2+NFS3_sattr_sz)
61#define NFS3_removeargs_sz (NFS3_fh_sz+NFS3_filename_sz)
62#define NFS3_renameargs_sz (NFS3_diropargs_sz+NFS3_diropargs_sz)
63#define NFS3_linkargs_sz (NFS3_fh_sz+NFS3_diropargs_sz)
64#define NFS3_readdirargs_sz (NFS3_fh_sz+NFS3_cookieverf_sz+3)
65#define NFS3_readdirplusargs_sz (NFS3_fh_sz+NFS3_cookieverf_sz+4)
66#define NFS3_commitargs_sz (NFS3_fh_sz+3)
67
68#define NFS3_getattrres_sz (1+NFS3_fattr_sz)
69#define NFS3_setattrres_sz (1+NFS3_wcc_data_sz)
70#define NFS3_removeres_sz (NFS3_setattrres_sz)
71#define NFS3_lookupres_sz (1+NFS3_fh_sz+(2 * NFS3_post_op_attr_sz))
72#define NFS3_accessres_sz (1+NFS3_post_op_attr_sz+1)
73#define NFS3_readlinkres_sz (1+NFS3_post_op_attr_sz+1+NFS3_pagepad_sz)
74#define NFS3_readres_sz (1+NFS3_post_op_attr_sz+3+NFS3_pagepad_sz)
75#define NFS3_writeres_sz (1+NFS3_wcc_data_sz+4)
76#define NFS3_createres_sz (1+NFS3_post_op_fh_sz+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
77#define NFS3_renameres_sz (1+(2 * NFS3_wcc_data_sz))
78#define NFS3_linkres_sz (1+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
79#define NFS3_readdirres_sz (1+NFS3_post_op_attr_sz+2+NFS3_pagepad_sz)
80#define NFS3_fsstatres_sz (1+NFS3_post_op_attr_sz+13)
81#define NFS3_fsinfores_sz (1+NFS3_post_op_attr_sz+12)
82#define NFS3_pathconfres_sz (1+NFS3_post_op_attr_sz+6)
83#define NFS3_commitres_sz (1+NFS3_wcc_data_sz+2)
84
85#define ACL3_getaclargs_sz (NFS3_fh_sz+1)
86#define ACL3_setaclargs_sz (NFS3_fh_sz+1+ \
87 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
88#define ACL3_getaclres_sz (1+NFS3_post_op_attr_sz+1+ \
89 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE)+\
90 NFS3_pagepad_sz)
91#define ACL3_setaclres_sz (1+NFS3_post_op_attr_sz)
92
93/*
94 * Map file type to S_IFMT bits
95 */
96static const umode_t nfs_type2fmt[] = {
97 [NF3BAD] = 0,
98 [NF3REG] = S_IFREG,
99 [NF3DIR] = S_IFDIR,
100 [NF3BLK] = S_IFBLK,
101 [NF3CHR] = S_IFCHR,
102 [NF3LNK] = S_IFLNK,
103 [NF3SOCK] = S_IFSOCK,
104 [NF3FIFO] = S_IFIFO,
105};
106
107static struct user_namespace *rpc_userns(const struct rpc_clnt *clnt)
108{
109 if (clnt && clnt->cl_cred)
110 return clnt->cl_cred->user_ns;
111 return &init_user_ns;
112}
113
114static struct user_namespace *rpc_rqst_userns(const struct rpc_rqst *rqstp)
115{
116 if (rqstp->rq_task)
117 return rpc_userns(rqstp->rq_task->tk_client);
118 return &init_user_ns;
119}
120
121/*
122 * Encode/decode NFSv3 basic data types
123 *
124 * Basic NFSv3 data types are defined in section 2.5 of RFC 1813:
125 * "NFS Version 3 Protocol Specification".
126 *
127 * Not all basic data types have their own encoding and decoding
128 * functions. For run-time efficiency, some data types are encoded
129 * or decoded inline.
130 */
131
132static void encode_uint32(struct xdr_stream *xdr, u32 value)
133{
134 __be32 *p = xdr_reserve_space(xdr, 4);
135 *p = cpu_to_be32(value);
136}
137
138static int decode_uint32(struct xdr_stream *xdr, u32 *value)
139{
140 __be32 *p;
141
142 p = xdr_inline_decode(xdr, 4);
143 if (unlikely(!p))
144 return -EIO;
145 *value = be32_to_cpup(p);
146 return 0;
147}
148
149static int decode_uint64(struct xdr_stream *xdr, u64 *value)
150{
151 __be32 *p;
152
153 p = xdr_inline_decode(xdr, 8);
154 if (unlikely(!p))
155 return -EIO;
156 xdr_decode_hyper(p, value);
157 return 0;
158}
159
160/*
161 * fileid3
162 *
163 * typedef uint64 fileid3;
164 */
165static __be32 *xdr_decode_fileid3(__be32 *p, u64 *fileid)
166{
167 return xdr_decode_hyper(p, fileid);
168}
169
170static int decode_fileid3(struct xdr_stream *xdr, u64 *fileid)
171{
172 return decode_uint64(xdr, fileid);
173}
174
175/*
176 * filename3
177 *
178 * typedef string filename3<>;
179 */
180static void encode_filename3(struct xdr_stream *xdr,
181 const char *name, u32 length)
182{
183 __be32 *p;
184
185 WARN_ON_ONCE(length > NFS3_MAXNAMLEN);
186 p = xdr_reserve_space(xdr, 4 + length);
187 xdr_encode_opaque(p, name, length);
188}
189
190static int decode_inline_filename3(struct xdr_stream *xdr,
191 const char **name, u32 *length)
192{
193 __be32 *p;
194 u32 count;
195
196 p = xdr_inline_decode(xdr, 4);
197 if (unlikely(!p))
198 return -EIO;
199 count = be32_to_cpup(p);
200 if (count > NFS3_MAXNAMLEN)
201 goto out_nametoolong;
202 p = xdr_inline_decode(xdr, count);
203 if (unlikely(!p))
204 return -EIO;
205 *name = (const char *)p;
206 *length = count;
207 return 0;
208
209out_nametoolong:
210 dprintk("NFS: returned filename too long: %u\n", count);
211 return -ENAMETOOLONG;
212}
213
214/*
215 * nfspath3
216 *
217 * typedef string nfspath3<>;
218 */
219static void encode_nfspath3(struct xdr_stream *xdr, struct page **pages,
220 const u32 length)
221{
222 encode_uint32(xdr, length);
223 xdr_write_pages(xdr, pages, 0, length);
224}
225
226static int decode_nfspath3(struct xdr_stream *xdr)
227{
228 u32 recvd, count;
229 __be32 *p;
230
231 p = xdr_inline_decode(xdr, 4);
232 if (unlikely(!p))
233 return -EIO;
234 count = be32_to_cpup(p);
235 if (unlikely(count >= xdr->buf->page_len || count > NFS3_MAXPATHLEN))
236 goto out_nametoolong;
237 recvd = xdr_read_pages(xdr, count);
238 if (unlikely(count > recvd))
239 goto out_cheating;
240 xdr_terminate_string(xdr->buf, count);
241 return 0;
242
243out_nametoolong:
244 dprintk("NFS: returned pathname too long: %u\n", count);
245 return -ENAMETOOLONG;
246out_cheating:
247 dprintk("NFS: server cheating in pathname result: "
248 "count %u > recvd %u\n", count, recvd);
249 return -EIO;
250}
251
252/*
253 * cookie3
254 *
255 * typedef uint64 cookie3
256 */
257static __be32 *xdr_encode_cookie3(__be32 *p, u64 cookie)
258{
259 return xdr_encode_hyper(p, cookie);
260}
261
262static int decode_cookie3(struct xdr_stream *xdr, u64 *cookie)
263{
264 return decode_uint64(xdr, cookie);
265}
266
267/*
268 * cookieverf3
269 *
270 * typedef opaque cookieverf3[NFS3_COOKIEVERFSIZE];
271 */
272static __be32 *xdr_encode_cookieverf3(__be32 *p, const __be32 *verifier)
273{
274 memcpy(p, verifier, NFS3_COOKIEVERFSIZE);
275 return p + XDR_QUADLEN(NFS3_COOKIEVERFSIZE);
276}
277
278static int decode_cookieverf3(struct xdr_stream *xdr, __be32 *verifier)
279{
280 __be32 *p;
281
282 p = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE);
283 if (unlikely(!p))
284 return -EIO;
285 memcpy(verifier, p, NFS3_COOKIEVERFSIZE);
286 return 0;
287}
288
289/*
290 * createverf3
291 *
292 * typedef opaque createverf3[NFS3_CREATEVERFSIZE];
293 */
294static void encode_createverf3(struct xdr_stream *xdr, const __be32 *verifier)
295{
296 __be32 *p;
297
298 p = xdr_reserve_space(xdr, NFS3_CREATEVERFSIZE);
299 memcpy(p, verifier, NFS3_CREATEVERFSIZE);
300}
301
302static int decode_writeverf3(struct xdr_stream *xdr, struct nfs_write_verifier *verifier)
303{
304 __be32 *p;
305
306 p = xdr_inline_decode(xdr, NFS3_WRITEVERFSIZE);
307 if (unlikely(!p))
308 return -EIO;
309 memcpy(verifier->data, p, NFS3_WRITEVERFSIZE);
310 return 0;
311}
312
313/*
314 * size3
315 *
316 * typedef uint64 size3;
317 */
318static __be32 *xdr_decode_size3(__be32 *p, u64 *size)
319{
320 return xdr_decode_hyper(p, size);
321}
322
323/*
324 * nfsstat3
325 *
326 * enum nfsstat3 {
327 * NFS3_OK = 0,
328 * ...
329 * }
330 */
331#define NFS3_OK NFS_OK
332
333static int decode_nfsstat3(struct xdr_stream *xdr, enum nfs_stat *status)
334{
335 __be32 *p;
336
337 p = xdr_inline_decode(xdr, 4);
338 if (unlikely(!p))
339 return -EIO;
340 if (unlikely(*p != cpu_to_be32(NFS3_OK)))
341 goto out_status;
342 *status = 0;
343 return 0;
344out_status:
345 *status = be32_to_cpup(p);
346 trace_nfs_xdr_status(xdr, (int)*status);
347 return 0;
348}
349
350/*
351 * ftype3
352 *
353 * enum ftype3 {
354 * NF3REG = 1,
355 * NF3DIR = 2,
356 * NF3BLK = 3,
357 * NF3CHR = 4,
358 * NF3LNK = 5,
359 * NF3SOCK = 6,
360 * NF3FIFO = 7
361 * };
362 */
363static void encode_ftype3(struct xdr_stream *xdr, const u32 type)
364{
365 encode_uint32(xdr, type);
366}
367
368static __be32 *xdr_decode_ftype3(__be32 *p, umode_t *mode)
369{
370 u32 type;
371
372 type = be32_to_cpup(p++);
373 if (type > NF3FIFO)
374 type = NF3NON;
375 *mode = nfs_type2fmt[type];
376 return p;
377}
378
379/*
380 * specdata3
381 *
382 * struct specdata3 {
383 * uint32 specdata1;
384 * uint32 specdata2;
385 * };
386 */
387static void encode_specdata3(struct xdr_stream *xdr, const dev_t rdev)
388{
389 __be32 *p;
390
391 p = xdr_reserve_space(xdr, 8);
392 *p++ = cpu_to_be32(MAJOR(rdev));
393 *p = cpu_to_be32(MINOR(rdev));
394}
395
396static __be32 *xdr_decode_specdata3(__be32 *p, dev_t *rdev)
397{
398 unsigned int major, minor;
399
400 major = be32_to_cpup(p++);
401 minor = be32_to_cpup(p++);
402 *rdev = MKDEV(major, minor);
403 if (MAJOR(*rdev) != major || MINOR(*rdev) != minor)
404 *rdev = 0;
405 return p;
406}
407
408/*
409 * nfs_fh3
410 *
411 * struct nfs_fh3 {
412 * opaque data<NFS3_FHSIZE>;
413 * };
414 */
415static void encode_nfs_fh3(struct xdr_stream *xdr, const struct nfs_fh *fh)
416{
417 __be32 *p;
418
419 WARN_ON_ONCE(fh->size > NFS3_FHSIZE);
420 p = xdr_reserve_space(xdr, 4 + fh->size);
421 xdr_encode_opaque(p, fh->data, fh->size);
422}
423
424static int decode_nfs_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
425{
426 u32 length;
427 __be32 *p;
428
429 p = xdr_inline_decode(xdr, 4);
430 if (unlikely(!p))
431 return -EIO;
432 length = be32_to_cpup(p++);
433 if (unlikely(length > NFS3_FHSIZE || length == 0))
434 goto out_toobig;
435 p = xdr_inline_decode(xdr, length);
436 if (unlikely(!p))
437 return -EIO;
438 fh->size = length;
439 memcpy(fh->data, p, length);
440 return 0;
441out_toobig:
442 trace_nfs_xdr_bad_filehandle(xdr, NFSERR_BADHANDLE);
443 return -E2BIG;
444}
445
446static void zero_nfs_fh3(struct nfs_fh *fh)
447{
448 memset(fh, 0, sizeof(*fh));
449}
450
451/*
452 * nfstime3
453 *
454 * struct nfstime3 {
455 * uint32 seconds;
456 * uint32 nseconds;
457 * };
458 */
459static __be32 *xdr_encode_nfstime3(__be32 *p, const struct timespec64 *timep)
460{
461 *p++ = cpu_to_be32((u32)timep->tv_sec);
462 *p++ = cpu_to_be32(timep->tv_nsec);
463 return p;
464}
465
466static __be32 *xdr_decode_nfstime3(__be32 *p, struct timespec64 *timep)
467{
468 timep->tv_sec = be32_to_cpup(p++);
469 timep->tv_nsec = be32_to_cpup(p++);
470 return p;
471}
472
473/*
474 * sattr3
475 *
476 * enum time_how {
477 * DONT_CHANGE = 0,
478 * SET_TO_SERVER_TIME = 1,
479 * SET_TO_CLIENT_TIME = 2
480 * };
481 *
482 * union set_mode3 switch (bool set_it) {
483 * case TRUE:
484 * mode3 mode;
485 * default:
486 * void;
487 * };
488 *
489 * union set_uid3 switch (bool set_it) {
490 * case TRUE:
491 * uid3 uid;
492 * default:
493 * void;
494 * };
495 *
496 * union set_gid3 switch (bool set_it) {
497 * case TRUE:
498 * gid3 gid;
499 * default:
500 * void;
501 * };
502 *
503 * union set_size3 switch (bool set_it) {
504 * case TRUE:
505 * size3 size;
506 * default:
507 * void;
508 * };
509 *
510 * union set_atime switch (time_how set_it) {
511 * case SET_TO_CLIENT_TIME:
512 * nfstime3 atime;
513 * default:
514 * void;
515 * };
516 *
517 * union set_mtime switch (time_how set_it) {
518 * case SET_TO_CLIENT_TIME:
519 * nfstime3 mtime;
520 * default:
521 * void;
522 * };
523 *
524 * struct sattr3 {
525 * set_mode3 mode;
526 * set_uid3 uid;
527 * set_gid3 gid;
528 * set_size3 size;
529 * set_atime atime;
530 * set_mtime mtime;
531 * };
532 */
533static void encode_sattr3(struct xdr_stream *xdr, const struct iattr *attr,
534 struct user_namespace *userns)
535{
536 u32 nbytes;
537 __be32 *p;
538
539 /*
540 * In order to make only a single xdr_reserve_space() call,
541 * pre-compute the total number of bytes to be reserved.
542 * Six boolean values, one for each set_foo field, are always
543 * present in the encoded result, so start there.
544 */
545 nbytes = 6 * 4;
546 if (attr->ia_valid & ATTR_MODE)
547 nbytes += 4;
548 if (attr->ia_valid & ATTR_UID)
549 nbytes += 4;
550 if (attr->ia_valid & ATTR_GID)
551 nbytes += 4;
552 if (attr->ia_valid & ATTR_SIZE)
553 nbytes += 8;
554 if (attr->ia_valid & ATTR_ATIME_SET)
555 nbytes += 8;
556 if (attr->ia_valid & ATTR_MTIME_SET)
557 nbytes += 8;
558 p = xdr_reserve_space(xdr, nbytes);
559
560 if (attr->ia_valid & ATTR_MODE) {
561 *p++ = xdr_one;
562 *p++ = cpu_to_be32(attr->ia_mode & S_IALLUGO);
563 } else
564 *p++ = xdr_zero;
565
566 if (attr->ia_valid & ATTR_UID) {
567 *p++ = xdr_one;
568 *p++ = cpu_to_be32(from_kuid_munged(userns, attr->ia_uid));
569 } else
570 *p++ = xdr_zero;
571
572 if (attr->ia_valid & ATTR_GID) {
573 *p++ = xdr_one;
574 *p++ = cpu_to_be32(from_kgid_munged(userns, attr->ia_gid));
575 } else
576 *p++ = xdr_zero;
577
578 if (attr->ia_valid & ATTR_SIZE) {
579 *p++ = xdr_one;
580 p = xdr_encode_hyper(p, (u64)attr->ia_size);
581 } else
582 *p++ = xdr_zero;
583
584 if (attr->ia_valid & ATTR_ATIME_SET) {
585 *p++ = xdr_two;
586 p = xdr_encode_nfstime3(p, &attr->ia_atime);
587 } else if (attr->ia_valid & ATTR_ATIME) {
588 *p++ = xdr_one;
589 } else
590 *p++ = xdr_zero;
591
592 if (attr->ia_valid & ATTR_MTIME_SET) {
593 *p++ = xdr_two;
594 xdr_encode_nfstime3(p, &attr->ia_mtime);
595 } else if (attr->ia_valid & ATTR_MTIME) {
596 *p = xdr_one;
597 } else
598 *p = xdr_zero;
599}
600
601/*
602 * fattr3
603 *
604 * struct fattr3 {
605 * ftype3 type;
606 * mode3 mode;
607 * uint32 nlink;
608 * uid3 uid;
609 * gid3 gid;
610 * size3 size;
611 * size3 used;
612 * specdata3 rdev;
613 * uint64 fsid;
614 * fileid3 fileid;
615 * nfstime3 atime;
616 * nfstime3 mtime;
617 * nfstime3 ctime;
618 * };
619 */
620static int decode_fattr3(struct xdr_stream *xdr, struct nfs_fattr *fattr,
621 struct user_namespace *userns)
622{
623 umode_t fmode;
624 __be32 *p;
625
626 p = xdr_inline_decode(xdr, NFS3_fattr_sz << 2);
627 if (unlikely(!p))
628 return -EIO;
629
630 p = xdr_decode_ftype3(p, &fmode);
631
632 fattr->mode = (be32_to_cpup(p++) & ~S_IFMT) | fmode;
633 fattr->nlink = be32_to_cpup(p++);
634 fattr->uid = make_kuid(userns, be32_to_cpup(p++));
635 if (!uid_valid(fattr->uid))
636 goto out_uid;
637 fattr->gid = make_kgid(userns, be32_to_cpup(p++));
638 if (!gid_valid(fattr->gid))
639 goto out_gid;
640
641 p = xdr_decode_size3(p, &fattr->size);
642 p = xdr_decode_size3(p, &fattr->du.nfs3.used);
643 p = xdr_decode_specdata3(p, &fattr->rdev);
644
645 p = xdr_decode_hyper(p, &fattr->fsid.major);
646 fattr->fsid.minor = 0;
647
648 p = xdr_decode_fileid3(p, &fattr->fileid);
649 p = xdr_decode_nfstime3(p, &fattr->atime);
650 p = xdr_decode_nfstime3(p, &fattr->mtime);
651 xdr_decode_nfstime3(p, &fattr->ctime);
652 fattr->change_attr = nfs_timespec_to_change_attr(&fattr->ctime);
653
654 fattr->valid |= NFS_ATTR_FATTR_V3;
655 return 0;
656out_uid:
657 dprintk("NFS: returned invalid uid\n");
658 return -EINVAL;
659out_gid:
660 dprintk("NFS: returned invalid gid\n");
661 return -EINVAL;
662}
663
664/*
665 * post_op_attr
666 *
667 * union post_op_attr switch (bool attributes_follow) {
668 * case TRUE:
669 * fattr3 attributes;
670 * case FALSE:
671 * void;
672 * };
673 */
674static int decode_post_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr,
675 struct user_namespace *userns)
676{
677 __be32 *p;
678
679 p = xdr_inline_decode(xdr, 4);
680 if (unlikely(!p))
681 return -EIO;
682 if (*p != xdr_zero)
683 return decode_fattr3(xdr, fattr, userns);
684 return 0;
685}
686
687/*
688 * wcc_attr
689 * struct wcc_attr {
690 * size3 size;
691 * nfstime3 mtime;
692 * nfstime3 ctime;
693 * };
694 */
695static int decode_wcc_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
696{
697 __be32 *p;
698
699 p = xdr_inline_decode(xdr, NFS3_wcc_attr_sz << 2);
700 if (unlikely(!p))
701 return -EIO;
702
703 fattr->valid |= NFS_ATTR_FATTR_PRESIZE
704 | NFS_ATTR_FATTR_PRECHANGE
705 | NFS_ATTR_FATTR_PREMTIME
706 | NFS_ATTR_FATTR_PRECTIME;
707
708 p = xdr_decode_size3(p, &fattr->pre_size);
709 p = xdr_decode_nfstime3(p, &fattr->pre_mtime);
710 xdr_decode_nfstime3(p, &fattr->pre_ctime);
711 fattr->pre_change_attr = nfs_timespec_to_change_attr(&fattr->pre_ctime);
712
713 return 0;
714}
715
716/*
717 * pre_op_attr
718 * union pre_op_attr switch (bool attributes_follow) {
719 * case TRUE:
720 * wcc_attr attributes;
721 * case FALSE:
722 * void;
723 * };
724 *
725 * wcc_data
726 *
727 * struct wcc_data {
728 * pre_op_attr before;
729 * post_op_attr after;
730 * };
731 */
732static int decode_pre_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
733{
734 __be32 *p;
735
736 p = xdr_inline_decode(xdr, 4);
737 if (unlikely(!p))
738 return -EIO;
739 if (*p != xdr_zero)
740 return decode_wcc_attr(xdr, fattr);
741 return 0;
742}
743
744static int decode_wcc_data(struct xdr_stream *xdr, struct nfs_fattr *fattr,
745 struct user_namespace *userns)
746{
747 int error;
748
749 error = decode_pre_op_attr(xdr, fattr);
750 if (unlikely(error))
751 goto out;
752 error = decode_post_op_attr(xdr, fattr, userns);
753out:
754 return error;
755}
756
757/*
758 * post_op_fh3
759 *
760 * union post_op_fh3 switch (bool handle_follows) {
761 * case TRUE:
762 * nfs_fh3 handle;
763 * case FALSE:
764 * void;
765 * };
766 */
767static int decode_post_op_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
768{
769 __be32 *p = xdr_inline_decode(xdr, 4);
770 if (unlikely(!p))
771 return -EIO;
772 if (*p != xdr_zero)
773 return decode_nfs_fh3(xdr, fh);
774 zero_nfs_fh3(fh);
775 return 0;
776}
777
778/*
779 * diropargs3
780 *
781 * struct diropargs3 {
782 * nfs_fh3 dir;
783 * filename3 name;
784 * };
785 */
786static void encode_diropargs3(struct xdr_stream *xdr, const struct nfs_fh *fh,
787 const char *name, u32 length)
788{
789 encode_nfs_fh3(xdr, fh);
790 encode_filename3(xdr, name, length);
791}
792
793
794/*
795 * NFSv3 XDR encode functions
796 *
797 * NFSv3 argument types are defined in section 3.3 of RFC 1813:
798 * "NFS Version 3 Protocol Specification".
799 */
800
801/*
802 * 3.3.1 GETATTR3args
803 *
804 * struct GETATTR3args {
805 * nfs_fh3 object;
806 * };
807 */
808static void nfs3_xdr_enc_getattr3args(struct rpc_rqst *req,
809 struct xdr_stream *xdr,
810 const void *data)
811{
812 const struct nfs_fh *fh = data;
813
814 encode_nfs_fh3(xdr, fh);
815}
816
817/*
818 * 3.3.2 SETATTR3args
819 *
820 * union sattrguard3 switch (bool check) {
821 * case TRUE:
822 * nfstime3 obj_ctime;
823 * case FALSE:
824 * void;
825 * };
826 *
827 * struct SETATTR3args {
828 * nfs_fh3 object;
829 * sattr3 new_attributes;
830 * sattrguard3 guard;
831 * };
832 */
833static void encode_sattrguard3(struct xdr_stream *xdr,
834 const struct nfs3_sattrargs *args)
835{
836 __be32 *p;
837
838 if (args->guard) {
839 p = xdr_reserve_space(xdr, 4 + 8);
840 *p++ = xdr_one;
841 xdr_encode_nfstime3(p, &args->guardtime);
842 } else {
843 p = xdr_reserve_space(xdr, 4);
844 *p = xdr_zero;
845 }
846}
847
848static void nfs3_xdr_enc_setattr3args(struct rpc_rqst *req,
849 struct xdr_stream *xdr,
850 const void *data)
851{
852 const struct nfs3_sattrargs *args = data;
853 encode_nfs_fh3(xdr, args->fh);
854 encode_sattr3(xdr, args->sattr, rpc_rqst_userns(req));
855 encode_sattrguard3(xdr, args);
856}
857
858/*
859 * 3.3.3 LOOKUP3args
860 *
861 * struct LOOKUP3args {
862 * diropargs3 what;
863 * };
864 */
865static void nfs3_xdr_enc_lookup3args(struct rpc_rqst *req,
866 struct xdr_stream *xdr,
867 const void *data)
868{
869 const struct nfs3_diropargs *args = data;
870
871 encode_diropargs3(xdr, args->fh, args->name, args->len);
872}
873
874/*
875 * 3.3.4 ACCESS3args
876 *
877 * struct ACCESS3args {
878 * nfs_fh3 object;
879 * uint32 access;
880 * };
881 */
882static void encode_access3args(struct xdr_stream *xdr,
883 const struct nfs3_accessargs *args)
884{
885 encode_nfs_fh3(xdr, args->fh);
886 encode_uint32(xdr, args->access);
887}
888
889static void nfs3_xdr_enc_access3args(struct rpc_rqst *req,
890 struct xdr_stream *xdr,
891 const void *data)
892{
893 const struct nfs3_accessargs *args = data;
894
895 encode_access3args(xdr, args);
896}
897
898/*
899 * 3.3.5 READLINK3args
900 *
901 * struct READLINK3args {
902 * nfs_fh3 symlink;
903 * };
904 */
905static void nfs3_xdr_enc_readlink3args(struct rpc_rqst *req,
906 struct xdr_stream *xdr,
907 const void *data)
908{
909 const struct nfs3_readlinkargs *args = data;
910
911 encode_nfs_fh3(xdr, args->fh);
912 rpc_prepare_reply_pages(req, args->pages, args->pgbase, args->pglen,
913 NFS3_readlinkres_sz - NFS3_pagepad_sz);
914}
915
916/*
917 * 3.3.6 READ3args
918 *
919 * struct READ3args {
920 * nfs_fh3 file;
921 * offset3 offset;
922 * count3 count;
923 * };
924 */
925static void encode_read3args(struct xdr_stream *xdr,
926 const struct nfs_pgio_args *args)
927{
928 __be32 *p;
929
930 encode_nfs_fh3(xdr, args->fh);
931
932 p = xdr_reserve_space(xdr, 8 + 4);
933 p = xdr_encode_hyper(p, args->offset);
934 *p = cpu_to_be32(args->count);
935}
936
937static void nfs3_xdr_enc_read3args(struct rpc_rqst *req,
938 struct xdr_stream *xdr,
939 const void *data)
940{
941 const struct nfs_pgio_args *args = data;
942 unsigned int replen = args->replen ? args->replen :
943 NFS3_readres_sz - NFS3_pagepad_sz;
944
945 encode_read3args(xdr, args);
946 rpc_prepare_reply_pages(req, args->pages, args->pgbase,
947 args->count, replen);
948 req->rq_rcv_buf.flags |= XDRBUF_READ;
949}
950
951/*
952 * 3.3.7 WRITE3args
953 *
954 * enum stable_how {
955 * UNSTABLE = 0,
956 * DATA_SYNC = 1,
957 * FILE_SYNC = 2
958 * };
959 *
960 * struct WRITE3args {
961 * nfs_fh3 file;
962 * offset3 offset;
963 * count3 count;
964 * stable_how stable;
965 * opaque data<>;
966 * };
967 */
968static void encode_write3args(struct xdr_stream *xdr,
969 const struct nfs_pgio_args *args)
970{
971 __be32 *p;
972
973 encode_nfs_fh3(xdr, args->fh);
974
975 p = xdr_reserve_space(xdr, 8 + 4 + 4 + 4);
976 p = xdr_encode_hyper(p, args->offset);
977 *p++ = cpu_to_be32(args->count);
978 *p++ = cpu_to_be32(args->stable);
979 *p = cpu_to_be32(args->count);
980 xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
981}
982
983static void nfs3_xdr_enc_write3args(struct rpc_rqst *req,
984 struct xdr_stream *xdr,
985 const void *data)
986{
987 const struct nfs_pgio_args *args = data;
988
989 encode_write3args(xdr, args);
990 xdr->buf->flags |= XDRBUF_WRITE;
991}
992
993/*
994 * 3.3.8 CREATE3args
995 *
996 * enum createmode3 {
997 * UNCHECKED = 0,
998 * GUARDED = 1,
999 * EXCLUSIVE = 2
1000 * };
1001 *
1002 * union createhow3 switch (createmode3 mode) {
1003 * case UNCHECKED:
1004 * case GUARDED:
1005 * sattr3 obj_attributes;
1006 * case EXCLUSIVE:
1007 * createverf3 verf;
1008 * };
1009 *
1010 * struct CREATE3args {
1011 * diropargs3 where;
1012 * createhow3 how;
1013 * };
1014 */
1015static void encode_createhow3(struct xdr_stream *xdr,
1016 const struct nfs3_createargs *args,
1017 struct user_namespace *userns)
1018{
1019 encode_uint32(xdr, args->createmode);
1020 switch (args->createmode) {
1021 case NFS3_CREATE_UNCHECKED:
1022 case NFS3_CREATE_GUARDED:
1023 encode_sattr3(xdr, args->sattr, userns);
1024 break;
1025 case NFS3_CREATE_EXCLUSIVE:
1026 encode_createverf3(xdr, args->verifier);
1027 break;
1028 default:
1029 BUG();
1030 }
1031}
1032
1033static void nfs3_xdr_enc_create3args(struct rpc_rqst *req,
1034 struct xdr_stream *xdr,
1035 const void *data)
1036{
1037 const struct nfs3_createargs *args = data;
1038
1039 encode_diropargs3(xdr, args->fh, args->name, args->len);
1040 encode_createhow3(xdr, args, rpc_rqst_userns(req));
1041}
1042
1043/*
1044 * 3.3.9 MKDIR3args
1045 *
1046 * struct MKDIR3args {
1047 * diropargs3 where;
1048 * sattr3 attributes;
1049 * };
1050 */
1051static void nfs3_xdr_enc_mkdir3args(struct rpc_rqst *req,
1052 struct xdr_stream *xdr,
1053 const void *data)
1054{
1055 const struct nfs3_mkdirargs *args = data;
1056
1057 encode_diropargs3(xdr, args->fh, args->name, args->len);
1058 encode_sattr3(xdr, args->sattr, rpc_rqst_userns(req));
1059}
1060
1061/*
1062 * 3.3.10 SYMLINK3args
1063 *
1064 * struct symlinkdata3 {
1065 * sattr3 symlink_attributes;
1066 * nfspath3 symlink_data;
1067 * };
1068 *
1069 * struct SYMLINK3args {
1070 * diropargs3 where;
1071 * symlinkdata3 symlink;
1072 * };
1073 */
1074static void encode_symlinkdata3(struct xdr_stream *xdr,
1075 const void *data,
1076 struct user_namespace *userns)
1077{
1078 const struct nfs3_symlinkargs *args = data;
1079
1080 encode_sattr3(xdr, args->sattr, userns);
1081 encode_nfspath3(xdr, args->pages, args->pathlen);
1082}
1083
1084static void nfs3_xdr_enc_symlink3args(struct rpc_rqst *req,
1085 struct xdr_stream *xdr,
1086 const void *data)
1087{
1088 const struct nfs3_symlinkargs *args = data;
1089
1090 encode_diropargs3(xdr, args->fromfh, args->fromname, args->fromlen);
1091 encode_symlinkdata3(xdr, args, rpc_rqst_userns(req));
1092 xdr->buf->flags |= XDRBUF_WRITE;
1093}
1094
1095/*
1096 * 3.3.11 MKNOD3args
1097 *
1098 * struct devicedata3 {
1099 * sattr3 dev_attributes;
1100 * specdata3 spec;
1101 * };
1102 *
1103 * union mknoddata3 switch (ftype3 type) {
1104 * case NF3CHR:
1105 * case NF3BLK:
1106 * devicedata3 device;
1107 * case NF3SOCK:
1108 * case NF3FIFO:
1109 * sattr3 pipe_attributes;
1110 * default:
1111 * void;
1112 * };
1113 *
1114 * struct MKNOD3args {
1115 * diropargs3 where;
1116 * mknoddata3 what;
1117 * };
1118 */
1119static void encode_devicedata3(struct xdr_stream *xdr,
1120 const struct nfs3_mknodargs *args,
1121 struct user_namespace *userns)
1122{
1123 encode_sattr3(xdr, args->sattr, userns);
1124 encode_specdata3(xdr, args->rdev);
1125}
1126
1127static void encode_mknoddata3(struct xdr_stream *xdr,
1128 const struct nfs3_mknodargs *args,
1129 struct user_namespace *userns)
1130{
1131 encode_ftype3(xdr, args->type);
1132 switch (args->type) {
1133 case NF3CHR:
1134 case NF3BLK:
1135 encode_devicedata3(xdr, args, userns);
1136 break;
1137 case NF3SOCK:
1138 case NF3FIFO:
1139 encode_sattr3(xdr, args->sattr, userns);
1140 break;
1141 case NF3REG:
1142 case NF3DIR:
1143 break;
1144 default:
1145 BUG();
1146 }
1147}
1148
1149static void nfs3_xdr_enc_mknod3args(struct rpc_rqst *req,
1150 struct xdr_stream *xdr,
1151 const void *data)
1152{
1153 const struct nfs3_mknodargs *args = data;
1154
1155 encode_diropargs3(xdr, args->fh, args->name, args->len);
1156 encode_mknoddata3(xdr, args, rpc_rqst_userns(req));
1157}
1158
1159/*
1160 * 3.3.12 REMOVE3args
1161 *
1162 * struct REMOVE3args {
1163 * diropargs3 object;
1164 * };
1165 */
1166static void nfs3_xdr_enc_remove3args(struct rpc_rqst *req,
1167 struct xdr_stream *xdr,
1168 const void *data)
1169{
1170 const struct nfs_removeargs *args = data;
1171
1172 encode_diropargs3(xdr, args->fh, args->name.name, args->name.len);
1173}
1174
1175/*
1176 * 3.3.14 RENAME3args
1177 *
1178 * struct RENAME3args {
1179 * diropargs3 from;
1180 * diropargs3 to;
1181 * };
1182 */
1183static void nfs3_xdr_enc_rename3args(struct rpc_rqst *req,
1184 struct xdr_stream *xdr,
1185 const void *data)
1186{
1187 const struct nfs_renameargs *args = data;
1188 const struct qstr *old = args->old_name;
1189 const struct qstr *new = args->new_name;
1190
1191 encode_diropargs3(xdr, args->old_dir, old->name, old->len);
1192 encode_diropargs3(xdr, args->new_dir, new->name, new->len);
1193}
1194
1195/*
1196 * 3.3.15 LINK3args
1197 *
1198 * struct LINK3args {
1199 * nfs_fh3 file;
1200 * diropargs3 link;
1201 * };
1202 */
1203static void nfs3_xdr_enc_link3args(struct rpc_rqst *req,
1204 struct xdr_stream *xdr,
1205 const void *data)
1206{
1207 const struct nfs3_linkargs *args = data;
1208
1209 encode_nfs_fh3(xdr, args->fromfh);
1210 encode_diropargs3(xdr, args->tofh, args->toname, args->tolen);
1211}
1212
1213/*
1214 * 3.3.16 READDIR3args
1215 *
1216 * struct READDIR3args {
1217 * nfs_fh3 dir;
1218 * cookie3 cookie;
1219 * cookieverf3 cookieverf;
1220 * count3 count;
1221 * };
1222 */
1223static void encode_readdir3args(struct xdr_stream *xdr,
1224 const struct nfs3_readdirargs *args)
1225{
1226 __be32 *p;
1227
1228 encode_nfs_fh3(xdr, args->fh);
1229
1230 p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4);
1231 p = xdr_encode_cookie3(p, args->cookie);
1232 p = xdr_encode_cookieverf3(p, args->verf);
1233 *p = cpu_to_be32(args->count);
1234}
1235
1236static void nfs3_xdr_enc_readdir3args(struct rpc_rqst *req,
1237 struct xdr_stream *xdr,
1238 const void *data)
1239{
1240 const struct nfs3_readdirargs *args = data;
1241
1242 encode_readdir3args(xdr, args);
1243 rpc_prepare_reply_pages(req, args->pages, 0, args->count,
1244 NFS3_readdirres_sz - NFS3_pagepad_sz);
1245}
1246
1247/*
1248 * 3.3.17 READDIRPLUS3args
1249 *
1250 * struct READDIRPLUS3args {
1251 * nfs_fh3 dir;
1252 * cookie3 cookie;
1253 * cookieverf3 cookieverf;
1254 * count3 dircount;
1255 * count3 maxcount;
1256 * };
1257 */
1258static void encode_readdirplus3args(struct xdr_stream *xdr,
1259 const struct nfs3_readdirargs *args)
1260{
1261 uint32_t dircount = args->count;
1262 uint32_t maxcount = args->count;
1263 __be32 *p;
1264
1265 encode_nfs_fh3(xdr, args->fh);
1266
1267 p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4 + 4);
1268 p = xdr_encode_cookie3(p, args->cookie);
1269 p = xdr_encode_cookieverf3(p, args->verf);
1270
1271 /*
1272 * readdirplus: need dircount + buffer size.
1273 * We just make sure we make dircount big enough
1274 */
1275 *p++ = cpu_to_be32(dircount);
1276 *p = cpu_to_be32(maxcount);
1277}
1278
1279static void nfs3_xdr_enc_readdirplus3args(struct rpc_rqst *req,
1280 struct xdr_stream *xdr,
1281 const void *data)
1282{
1283 const struct nfs3_readdirargs *args = data;
1284
1285 encode_readdirplus3args(xdr, args);
1286 rpc_prepare_reply_pages(req, args->pages, 0, args->count,
1287 NFS3_readdirres_sz - NFS3_pagepad_sz);
1288}
1289
1290/*
1291 * 3.3.21 COMMIT3args
1292 *
1293 * struct COMMIT3args {
1294 * nfs_fh3 file;
1295 * offset3 offset;
1296 * count3 count;
1297 * };
1298 */
1299static void encode_commit3args(struct xdr_stream *xdr,
1300 const struct nfs_commitargs *args)
1301{
1302 __be32 *p;
1303
1304 encode_nfs_fh3(xdr, args->fh);
1305
1306 p = xdr_reserve_space(xdr, 8 + 4);
1307 p = xdr_encode_hyper(p, args->offset);
1308 *p = cpu_to_be32(args->count);
1309}
1310
1311static void nfs3_xdr_enc_commit3args(struct rpc_rqst *req,
1312 struct xdr_stream *xdr,
1313 const void *data)
1314{
1315 const struct nfs_commitargs *args = data;
1316
1317 encode_commit3args(xdr, args);
1318}
1319
1320#ifdef CONFIG_NFS_V3_ACL
1321
1322static void nfs3_xdr_enc_getacl3args(struct rpc_rqst *req,
1323 struct xdr_stream *xdr,
1324 const void *data)
1325{
1326 const struct nfs3_getaclargs *args = data;
1327
1328 encode_nfs_fh3(xdr, args->fh);
1329 encode_uint32(xdr, args->mask);
1330 if (args->mask & (NFS_ACL | NFS_DFACL)) {
1331 rpc_prepare_reply_pages(req, args->pages, 0,
1332 NFSACL_MAXPAGES << PAGE_SHIFT,
1333 ACL3_getaclres_sz - NFS3_pagepad_sz);
1334 req->rq_rcv_buf.flags |= XDRBUF_SPARSE_PAGES;
1335 }
1336}
1337
1338static void nfs3_xdr_enc_setacl3args(struct rpc_rqst *req,
1339 struct xdr_stream *xdr,
1340 const void *data)
1341{
1342 const struct nfs3_setaclargs *args = data;
1343 unsigned int base;
1344 int error;
1345
1346 encode_nfs_fh3(xdr, NFS_FH(args->inode));
1347 encode_uint32(xdr, args->mask);
1348
1349 base = req->rq_slen;
1350 if (args->npages != 0)
1351 xdr_write_pages(xdr, args->pages, 0, args->len);
1352 else
1353 xdr_reserve_space(xdr, args->len);
1354
1355 error = nfsacl_encode(xdr->buf, base, args->inode,
1356 (args->mask & NFS_ACL) ?
1357 args->acl_access : NULL, 1, 0);
1358 /* FIXME: this is just broken */
1359 BUG_ON(error < 0);
1360 error = nfsacl_encode(xdr->buf, base + error, args->inode,
1361 (args->mask & NFS_DFACL) ?
1362 args->acl_default : NULL, 1,
1363 NFS_ACL_DEFAULT);
1364 BUG_ON(error < 0);
1365}
1366
1367#endif /* CONFIG_NFS_V3_ACL */
1368
1369/*
1370 * NFSv3 XDR decode functions
1371 *
1372 * NFSv3 result types are defined in section 3.3 of RFC 1813:
1373 * "NFS Version 3 Protocol Specification".
1374 */
1375
1376/*
1377 * 3.3.1 GETATTR3res
1378 *
1379 * struct GETATTR3resok {
1380 * fattr3 obj_attributes;
1381 * };
1382 *
1383 * union GETATTR3res switch (nfsstat3 status) {
1384 * case NFS3_OK:
1385 * GETATTR3resok resok;
1386 * default:
1387 * void;
1388 * };
1389 */
1390static int nfs3_xdr_dec_getattr3res(struct rpc_rqst *req,
1391 struct xdr_stream *xdr,
1392 void *result)
1393{
1394 enum nfs_stat status;
1395 int error;
1396
1397 error = decode_nfsstat3(xdr, &status);
1398 if (unlikely(error))
1399 goto out;
1400 if (status != NFS3_OK)
1401 goto out_default;
1402 error = decode_fattr3(xdr, result, rpc_rqst_userns(req));
1403out:
1404 return error;
1405out_default:
1406 return nfs_stat_to_errno(status);
1407}
1408
1409/*
1410 * 3.3.2 SETATTR3res
1411 *
1412 * struct SETATTR3resok {
1413 * wcc_data obj_wcc;
1414 * };
1415 *
1416 * struct SETATTR3resfail {
1417 * wcc_data obj_wcc;
1418 * };
1419 *
1420 * union SETATTR3res switch (nfsstat3 status) {
1421 * case NFS3_OK:
1422 * SETATTR3resok resok;
1423 * default:
1424 * SETATTR3resfail resfail;
1425 * };
1426 */
1427static int nfs3_xdr_dec_setattr3res(struct rpc_rqst *req,
1428 struct xdr_stream *xdr,
1429 void *result)
1430{
1431 enum nfs_stat status;
1432 int error;
1433
1434 error = decode_nfsstat3(xdr, &status);
1435 if (unlikely(error))
1436 goto out;
1437 error = decode_wcc_data(xdr, result, rpc_rqst_userns(req));
1438 if (unlikely(error))
1439 goto out;
1440 if (status != NFS3_OK)
1441 goto out_status;
1442out:
1443 return error;
1444out_status:
1445 return nfs_stat_to_errno(status);
1446}
1447
1448/*
1449 * 3.3.3 LOOKUP3res
1450 *
1451 * struct LOOKUP3resok {
1452 * nfs_fh3 object;
1453 * post_op_attr obj_attributes;
1454 * post_op_attr dir_attributes;
1455 * };
1456 *
1457 * struct LOOKUP3resfail {
1458 * post_op_attr dir_attributes;
1459 * };
1460 *
1461 * union LOOKUP3res switch (nfsstat3 status) {
1462 * case NFS3_OK:
1463 * LOOKUP3resok resok;
1464 * default:
1465 * LOOKUP3resfail resfail;
1466 * };
1467 */
1468static int nfs3_xdr_dec_lookup3res(struct rpc_rqst *req,
1469 struct xdr_stream *xdr,
1470 void *data)
1471{
1472 struct user_namespace *userns = rpc_rqst_userns(req);
1473 struct nfs3_diropres *result = data;
1474 enum nfs_stat status;
1475 int error;
1476
1477 error = decode_nfsstat3(xdr, &status);
1478 if (unlikely(error))
1479 goto out;
1480 if (status != NFS3_OK)
1481 goto out_default;
1482 error = decode_nfs_fh3(xdr, result->fh);
1483 if (unlikely(error))
1484 goto out;
1485 error = decode_post_op_attr(xdr, result->fattr, userns);
1486 if (unlikely(error))
1487 goto out;
1488 error = decode_post_op_attr(xdr, result->dir_attr, userns);
1489out:
1490 return error;
1491out_default:
1492 error = decode_post_op_attr(xdr, result->dir_attr, userns);
1493 if (unlikely(error))
1494 goto out;
1495 return nfs_stat_to_errno(status);
1496}
1497
1498/*
1499 * 3.3.4 ACCESS3res
1500 *
1501 * struct ACCESS3resok {
1502 * post_op_attr obj_attributes;
1503 * uint32 access;
1504 * };
1505 *
1506 * struct ACCESS3resfail {
1507 * post_op_attr obj_attributes;
1508 * };
1509 *
1510 * union ACCESS3res switch (nfsstat3 status) {
1511 * case NFS3_OK:
1512 * ACCESS3resok resok;
1513 * default:
1514 * ACCESS3resfail resfail;
1515 * };
1516 */
1517static int nfs3_xdr_dec_access3res(struct rpc_rqst *req,
1518 struct xdr_stream *xdr,
1519 void *data)
1520{
1521 struct nfs3_accessres *result = data;
1522 enum nfs_stat status;
1523 int error;
1524
1525 error = decode_nfsstat3(xdr, &status);
1526 if (unlikely(error))
1527 goto out;
1528 error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req));
1529 if (unlikely(error))
1530 goto out;
1531 if (status != NFS3_OK)
1532 goto out_default;
1533 error = decode_uint32(xdr, &result->access);
1534out:
1535 return error;
1536out_default:
1537 return nfs_stat_to_errno(status);
1538}
1539
1540/*
1541 * 3.3.5 READLINK3res
1542 *
1543 * struct READLINK3resok {
1544 * post_op_attr symlink_attributes;
1545 * nfspath3 data;
1546 * };
1547 *
1548 * struct READLINK3resfail {
1549 * post_op_attr symlink_attributes;
1550 * };
1551 *
1552 * union READLINK3res switch (nfsstat3 status) {
1553 * case NFS3_OK:
1554 * READLINK3resok resok;
1555 * default:
1556 * READLINK3resfail resfail;
1557 * };
1558 */
1559static int nfs3_xdr_dec_readlink3res(struct rpc_rqst *req,
1560 struct xdr_stream *xdr,
1561 void *result)
1562{
1563 enum nfs_stat status;
1564 int error;
1565
1566 error = decode_nfsstat3(xdr, &status);
1567 if (unlikely(error))
1568 goto out;
1569 error = decode_post_op_attr(xdr, result, rpc_rqst_userns(req));
1570 if (unlikely(error))
1571 goto out;
1572 if (status != NFS3_OK)
1573 goto out_default;
1574 error = decode_nfspath3(xdr);
1575out:
1576 return error;
1577out_default:
1578 return nfs_stat_to_errno(status);
1579}
1580
1581/*
1582 * 3.3.6 READ3res
1583 *
1584 * struct READ3resok {
1585 * post_op_attr file_attributes;
1586 * count3 count;
1587 * bool eof;
1588 * opaque data<>;
1589 * };
1590 *
1591 * struct READ3resfail {
1592 * post_op_attr file_attributes;
1593 * };
1594 *
1595 * union READ3res switch (nfsstat3 status) {
1596 * case NFS3_OK:
1597 * READ3resok resok;
1598 * default:
1599 * READ3resfail resfail;
1600 * };
1601 */
1602static int decode_read3resok(struct xdr_stream *xdr,
1603 struct nfs_pgio_res *result)
1604{
1605 u32 eof, count, ocount, recvd;
1606 __be32 *p;
1607
1608 p = xdr_inline_decode(xdr, 4 + 4 + 4);
1609 if (unlikely(!p))
1610 return -EIO;
1611 count = be32_to_cpup(p++);
1612 eof = be32_to_cpup(p++);
1613 ocount = be32_to_cpup(p++);
1614 if (unlikely(ocount != count))
1615 goto out_mismatch;
1616 recvd = xdr_read_pages(xdr, count);
1617 if (unlikely(count > recvd))
1618 goto out_cheating;
1619out:
1620 result->eof = eof;
1621 result->count = count;
1622 return count;
1623out_mismatch:
1624 dprintk("NFS: READ count doesn't match length of opaque: "
1625 "count %u != ocount %u\n", count, ocount);
1626 return -EIO;
1627out_cheating:
1628 dprintk("NFS: server cheating in read result: "
1629 "count %u > recvd %u\n", count, recvd);
1630 count = recvd;
1631 eof = 0;
1632 goto out;
1633}
1634
1635static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1636 void *data)
1637{
1638 struct nfs_pgio_res *result = data;
1639 unsigned int pos;
1640 enum nfs_stat status;
1641 int error;
1642
1643 pos = xdr_stream_pos(xdr);
1644 error = decode_nfsstat3(xdr, &status);
1645 if (unlikely(error))
1646 goto out;
1647 error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req));
1648 if (unlikely(error))
1649 goto out;
1650 result->op_status = status;
1651 if (status != NFS3_OK)
1652 goto out_status;
1653 result->replen = 3 + ((xdr_stream_pos(xdr) - pos) >> 2);
1654 error = decode_read3resok(xdr, result);
1655out:
1656 return error;
1657out_status:
1658 return nfs_stat_to_errno(status);
1659}
1660
1661/*
1662 * 3.3.7 WRITE3res
1663 *
1664 * enum stable_how {
1665 * UNSTABLE = 0,
1666 * DATA_SYNC = 1,
1667 * FILE_SYNC = 2
1668 * };
1669 *
1670 * struct WRITE3resok {
1671 * wcc_data file_wcc;
1672 * count3 count;
1673 * stable_how committed;
1674 * writeverf3 verf;
1675 * };
1676 *
1677 * struct WRITE3resfail {
1678 * wcc_data file_wcc;
1679 * };
1680 *
1681 * union WRITE3res switch (nfsstat3 status) {
1682 * case NFS3_OK:
1683 * WRITE3resok resok;
1684 * default:
1685 * WRITE3resfail resfail;
1686 * };
1687 */
1688static int decode_write3resok(struct xdr_stream *xdr,
1689 struct nfs_pgio_res *result)
1690{
1691 __be32 *p;
1692
1693 p = xdr_inline_decode(xdr, 4 + 4);
1694 if (unlikely(!p))
1695 return -EIO;
1696 result->count = be32_to_cpup(p++);
1697 result->verf->committed = be32_to_cpup(p++);
1698 if (unlikely(result->verf->committed > NFS_FILE_SYNC))
1699 goto out_badvalue;
1700 if (decode_writeverf3(xdr, &result->verf->verifier))
1701 return -EIO;
1702 return result->count;
1703out_badvalue:
1704 dprintk("NFS: bad stable_how value: %u\n", result->verf->committed);
1705 return -EIO;
1706}
1707
1708static int nfs3_xdr_dec_write3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1709 void *data)
1710{
1711 struct nfs_pgio_res *result = data;
1712 enum nfs_stat status;
1713 int error;
1714
1715 error = decode_nfsstat3(xdr, &status);
1716 if (unlikely(error))
1717 goto out;
1718 error = decode_wcc_data(xdr, result->fattr, rpc_rqst_userns(req));
1719 if (unlikely(error))
1720 goto out;
1721 result->op_status = status;
1722 if (status != NFS3_OK)
1723 goto out_status;
1724 error = decode_write3resok(xdr, result);
1725out:
1726 return error;
1727out_status:
1728 return nfs_stat_to_errno(status);
1729}
1730
1731/*
1732 * 3.3.8 CREATE3res
1733 *
1734 * struct CREATE3resok {
1735 * post_op_fh3 obj;
1736 * post_op_attr obj_attributes;
1737 * wcc_data dir_wcc;
1738 * };
1739 *
1740 * struct CREATE3resfail {
1741 * wcc_data dir_wcc;
1742 * };
1743 *
1744 * union CREATE3res switch (nfsstat3 status) {
1745 * case NFS3_OK:
1746 * CREATE3resok resok;
1747 * default:
1748 * CREATE3resfail resfail;
1749 * };
1750 */
1751static int decode_create3resok(struct xdr_stream *xdr,
1752 struct nfs3_diropres *result,
1753 struct user_namespace *userns)
1754{
1755 int error;
1756
1757 error = decode_post_op_fh3(xdr, result->fh);
1758 if (unlikely(error))
1759 goto out;
1760 error = decode_post_op_attr(xdr, result->fattr, userns);
1761 if (unlikely(error))
1762 goto out;
1763 /* The server isn't required to return a file handle.
1764 * If it didn't, force the client to perform a LOOKUP
1765 * to determine the correct file handle and attribute
1766 * values for the new object. */
1767 if (result->fh->size == 0)
1768 result->fattr->valid = 0;
1769 error = decode_wcc_data(xdr, result->dir_attr, userns);
1770out:
1771 return error;
1772}
1773
1774static int nfs3_xdr_dec_create3res(struct rpc_rqst *req,
1775 struct xdr_stream *xdr,
1776 void *data)
1777{
1778 struct user_namespace *userns = rpc_rqst_userns(req);
1779 struct nfs3_diropres *result = data;
1780 enum nfs_stat status;
1781 int error;
1782
1783 error = decode_nfsstat3(xdr, &status);
1784 if (unlikely(error))
1785 goto out;
1786 if (status != NFS3_OK)
1787 goto out_default;
1788 error = decode_create3resok(xdr, result, userns);
1789out:
1790 return error;
1791out_default:
1792 error = decode_wcc_data(xdr, result->dir_attr, userns);
1793 if (unlikely(error))
1794 goto out;
1795 return nfs_stat_to_errno(status);
1796}
1797
1798/*
1799 * 3.3.12 REMOVE3res
1800 *
1801 * struct REMOVE3resok {
1802 * wcc_data dir_wcc;
1803 * };
1804 *
1805 * struct REMOVE3resfail {
1806 * wcc_data dir_wcc;
1807 * };
1808 *
1809 * union REMOVE3res switch (nfsstat3 status) {
1810 * case NFS3_OK:
1811 * REMOVE3resok resok;
1812 * default:
1813 * REMOVE3resfail resfail;
1814 * };
1815 */
1816static int nfs3_xdr_dec_remove3res(struct rpc_rqst *req,
1817 struct xdr_stream *xdr,
1818 void *data)
1819{
1820 struct nfs_removeres *result = data;
1821 enum nfs_stat status;
1822 int error;
1823
1824 error = decode_nfsstat3(xdr, &status);
1825 if (unlikely(error))
1826 goto out;
1827 error = decode_wcc_data(xdr, result->dir_attr, rpc_rqst_userns(req));
1828 if (unlikely(error))
1829 goto out;
1830 if (status != NFS3_OK)
1831 goto out_status;
1832out:
1833 return error;
1834out_status:
1835 return nfs_stat_to_errno(status);
1836}
1837
1838/*
1839 * 3.3.14 RENAME3res
1840 *
1841 * struct RENAME3resok {
1842 * wcc_data fromdir_wcc;
1843 * wcc_data todir_wcc;
1844 * };
1845 *
1846 * struct RENAME3resfail {
1847 * wcc_data fromdir_wcc;
1848 * wcc_data todir_wcc;
1849 * };
1850 *
1851 * union RENAME3res switch (nfsstat3 status) {
1852 * case NFS3_OK:
1853 * RENAME3resok resok;
1854 * default:
1855 * RENAME3resfail resfail;
1856 * };
1857 */
1858static int nfs3_xdr_dec_rename3res(struct rpc_rqst *req,
1859 struct xdr_stream *xdr,
1860 void *data)
1861{
1862 struct user_namespace *userns = rpc_rqst_userns(req);
1863 struct nfs_renameres *result = data;
1864 enum nfs_stat status;
1865 int error;
1866
1867 error = decode_nfsstat3(xdr, &status);
1868 if (unlikely(error))
1869 goto out;
1870 error = decode_wcc_data(xdr, result->old_fattr, userns);
1871 if (unlikely(error))
1872 goto out;
1873 error = decode_wcc_data(xdr, result->new_fattr, userns);
1874 if (unlikely(error))
1875 goto out;
1876 if (status != NFS3_OK)
1877 goto out_status;
1878out:
1879 return error;
1880out_status:
1881 return nfs_stat_to_errno(status);
1882}
1883
1884/*
1885 * 3.3.15 LINK3res
1886 *
1887 * struct LINK3resok {
1888 * post_op_attr file_attributes;
1889 * wcc_data linkdir_wcc;
1890 * };
1891 *
1892 * struct LINK3resfail {
1893 * post_op_attr file_attributes;
1894 * wcc_data linkdir_wcc;
1895 * };
1896 *
1897 * union LINK3res switch (nfsstat3 status) {
1898 * case NFS3_OK:
1899 * LINK3resok resok;
1900 * default:
1901 * LINK3resfail resfail;
1902 * };
1903 */
1904static int nfs3_xdr_dec_link3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1905 void *data)
1906{
1907 struct user_namespace *userns = rpc_rqst_userns(req);
1908 struct nfs3_linkres *result = data;
1909 enum nfs_stat status;
1910 int error;
1911
1912 error = decode_nfsstat3(xdr, &status);
1913 if (unlikely(error))
1914 goto out;
1915 error = decode_post_op_attr(xdr, result->fattr, userns);
1916 if (unlikely(error))
1917 goto out;
1918 error = decode_wcc_data(xdr, result->dir_attr, userns);
1919 if (unlikely(error))
1920 goto out;
1921 if (status != NFS3_OK)
1922 goto out_status;
1923out:
1924 return error;
1925out_status:
1926 return nfs_stat_to_errno(status);
1927}
1928
1929/**
1930 * nfs3_decode_dirent - Decode a single NFSv3 directory entry stored in
1931 * the local page cache
1932 * @xdr: XDR stream where entry resides
1933 * @entry: buffer to fill in with entry data
1934 * @plus: boolean indicating whether this should be a readdirplus entry
1935 *
1936 * Returns zero if successful, otherwise a negative errno value is
1937 * returned.
1938 *
1939 * This function is not invoked during READDIR reply decoding, but
1940 * rather whenever an application invokes the getdents(2) system call
1941 * on a directory already in our cache.
1942 *
1943 * 3.3.16 entry3
1944 *
1945 * struct entry3 {
1946 * fileid3 fileid;
1947 * filename3 name;
1948 * cookie3 cookie;
1949 * fhandle3 filehandle;
1950 * post_op_attr3 attributes;
1951 * entry3 *nextentry;
1952 * };
1953 *
1954 * 3.3.17 entryplus3
1955 * struct entryplus3 {
1956 * fileid3 fileid;
1957 * filename3 name;
1958 * cookie3 cookie;
1959 * post_op_attr name_attributes;
1960 * post_op_fh3 name_handle;
1961 * entryplus3 *nextentry;
1962 * };
1963 */
1964int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
1965 bool plus)
1966{
1967 struct user_namespace *userns = rpc_userns(entry->server->client);
1968 __be32 *p;
1969 int error;
1970 u64 new_cookie;
1971
1972 p = xdr_inline_decode(xdr, 4);
1973 if (unlikely(!p))
1974 return -EAGAIN;
1975 if (*p == xdr_zero) {
1976 p = xdr_inline_decode(xdr, 4);
1977 if (unlikely(!p))
1978 return -EAGAIN;
1979 if (*p == xdr_zero)
1980 return -EAGAIN;
1981 entry->eof = 1;
1982 return -EBADCOOKIE;
1983 }
1984
1985 error = decode_fileid3(xdr, &entry->ino);
1986 if (unlikely(error))
1987 return -EAGAIN;
1988
1989 error = decode_inline_filename3(xdr, &entry->name, &entry->len);
1990 if (unlikely(error))
1991 return error == -ENAMETOOLONG ? -ENAMETOOLONG : -EAGAIN;
1992
1993 error = decode_cookie3(xdr, &new_cookie);
1994 if (unlikely(error))
1995 return -EAGAIN;
1996
1997 entry->d_type = DT_UNKNOWN;
1998
1999 if (plus) {
2000 entry->fattr->valid = 0;
2001 error = decode_post_op_attr(xdr, entry->fattr, userns);
2002 if (unlikely(error))
2003 return -EAGAIN;
2004 if (entry->fattr->valid & NFS_ATTR_FATTR_V3)
2005 entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);
2006
2007 if (entry->fattr->fileid != entry->ino) {
2008 entry->fattr->mounted_on_fileid = entry->ino;
2009 entry->fattr->valid |= NFS_ATTR_FATTR_MOUNTED_ON_FILEID;
2010 }
2011
2012 /* In fact, a post_op_fh3: */
2013 p = xdr_inline_decode(xdr, 4);
2014 if (unlikely(!p))
2015 return -EAGAIN;
2016 if (*p != xdr_zero) {
2017 error = decode_nfs_fh3(xdr, entry->fh);
2018 if (unlikely(error))
2019 return -EAGAIN;
2020 } else
2021 zero_nfs_fh3(entry->fh);
2022 }
2023
2024 entry->cookie = new_cookie;
2025
2026 return 0;
2027}
2028
2029/*
2030 * 3.3.16 READDIR3res
2031 *
2032 * struct dirlist3 {
2033 * entry3 *entries;
2034 * bool eof;
2035 * };
2036 *
2037 * struct READDIR3resok {
2038 * post_op_attr dir_attributes;
2039 * cookieverf3 cookieverf;
2040 * dirlist3 reply;
2041 * };
2042 *
2043 * struct READDIR3resfail {
2044 * post_op_attr dir_attributes;
2045 * };
2046 *
2047 * union READDIR3res switch (nfsstat3 status) {
2048 * case NFS3_OK:
2049 * READDIR3resok resok;
2050 * default:
2051 * READDIR3resfail resfail;
2052 * };
2053 *
2054 * Read the directory contents into the page cache, but otherwise
2055 * don't touch them. The actual decoding is done by nfs3_decode_entry()
2056 * during subsequent nfs_readdir() calls.
2057 */
2058static int decode_dirlist3(struct xdr_stream *xdr)
2059{
2060 return xdr_read_pages(xdr, xdr->buf->page_len);
2061}
2062
2063static int decode_readdir3resok(struct xdr_stream *xdr,
2064 struct nfs3_readdirres *result,
2065 struct user_namespace *userns)
2066{
2067 int error;
2068
2069 error = decode_post_op_attr(xdr, result->dir_attr, userns);
2070 if (unlikely(error))
2071 goto out;
2072 /* XXX: do we need to check if result->verf != NULL ? */
2073 error = decode_cookieverf3(xdr, result->verf);
2074 if (unlikely(error))
2075 goto out;
2076 error = decode_dirlist3(xdr);
2077out:
2078 return error;
2079}
2080
2081static int nfs3_xdr_dec_readdir3res(struct rpc_rqst *req,
2082 struct xdr_stream *xdr,
2083 void *data)
2084{
2085 struct nfs3_readdirres *result = data;
2086 enum nfs_stat status;
2087 int error;
2088
2089 error = decode_nfsstat3(xdr, &status);
2090 if (unlikely(error))
2091 goto out;
2092 if (status != NFS3_OK)
2093 goto out_default;
2094 error = decode_readdir3resok(xdr, result, rpc_rqst_userns(req));
2095out:
2096 return error;
2097out_default:
2098 error = decode_post_op_attr(xdr, result->dir_attr, rpc_rqst_userns(req));
2099 if (unlikely(error))
2100 goto out;
2101 return nfs_stat_to_errno(status);
2102}
2103
2104/*
2105 * 3.3.18 FSSTAT3res
2106 *
2107 * struct FSSTAT3resok {
2108 * post_op_attr obj_attributes;
2109 * size3 tbytes;
2110 * size3 fbytes;
2111 * size3 abytes;
2112 * size3 tfiles;
2113 * size3 ffiles;
2114 * size3 afiles;
2115 * uint32 invarsec;
2116 * };
2117 *
2118 * struct FSSTAT3resfail {
2119 * post_op_attr obj_attributes;
2120 * };
2121 *
2122 * union FSSTAT3res switch (nfsstat3 status) {
2123 * case NFS3_OK:
2124 * FSSTAT3resok resok;
2125 * default:
2126 * FSSTAT3resfail resfail;
2127 * };
2128 */
2129static int decode_fsstat3resok(struct xdr_stream *xdr,
2130 struct nfs_fsstat *result)
2131{
2132 __be32 *p;
2133
2134 p = xdr_inline_decode(xdr, 8 * 6 + 4);
2135 if (unlikely(!p))
2136 return -EIO;
2137 p = xdr_decode_size3(p, &result->tbytes);
2138 p = xdr_decode_size3(p, &result->fbytes);
2139 p = xdr_decode_size3(p, &result->abytes);
2140 p = xdr_decode_size3(p, &result->tfiles);
2141 p = xdr_decode_size3(p, &result->ffiles);
2142 xdr_decode_size3(p, &result->afiles);
2143 /* ignore invarsec */
2144 return 0;
2145}
2146
2147static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req,
2148 struct xdr_stream *xdr,
2149 void *data)
2150{
2151 struct nfs_fsstat *result = data;
2152 enum nfs_stat status;
2153 int error;
2154
2155 error = decode_nfsstat3(xdr, &status);
2156 if (unlikely(error))
2157 goto out;
2158 error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req));
2159 if (unlikely(error))
2160 goto out;
2161 if (status != NFS3_OK)
2162 goto out_status;
2163 error = decode_fsstat3resok(xdr, result);
2164out:
2165 return error;
2166out_status:
2167 return nfs_stat_to_errno(status);
2168}
2169
2170/*
2171 * 3.3.19 FSINFO3res
2172 *
2173 * struct FSINFO3resok {
2174 * post_op_attr obj_attributes;
2175 * uint32 rtmax;
2176 * uint32 rtpref;
2177 * uint32 rtmult;
2178 * uint32 wtmax;
2179 * uint32 wtpref;
2180 * uint32 wtmult;
2181 * uint32 dtpref;
2182 * size3 maxfilesize;
2183 * nfstime3 time_delta;
2184 * uint32 properties;
2185 * };
2186 *
2187 * struct FSINFO3resfail {
2188 * post_op_attr obj_attributes;
2189 * };
2190 *
2191 * union FSINFO3res switch (nfsstat3 status) {
2192 * case NFS3_OK:
2193 * FSINFO3resok resok;
2194 * default:
2195 * FSINFO3resfail resfail;
2196 * };
2197 */
2198static int decode_fsinfo3resok(struct xdr_stream *xdr,
2199 struct nfs_fsinfo *result)
2200{
2201 __be32 *p;
2202
2203 p = xdr_inline_decode(xdr, 4 * 7 + 8 + 8 + 4);
2204 if (unlikely(!p))
2205 return -EIO;
2206 result->rtmax = be32_to_cpup(p++);
2207 result->rtpref = be32_to_cpup(p++);
2208 result->rtmult = be32_to_cpup(p++);
2209 result->wtmax = be32_to_cpup(p++);
2210 result->wtpref = be32_to_cpup(p++);
2211 result->wtmult = be32_to_cpup(p++);
2212 result->dtpref = be32_to_cpup(p++);
2213 p = xdr_decode_size3(p, &result->maxfilesize);
2214 xdr_decode_nfstime3(p, &result->time_delta);
2215
2216 /* ignore properties */
2217 result->lease_time = 0;
2218 result->change_attr_type = NFS4_CHANGE_TYPE_IS_UNDEFINED;
2219 result->xattr_support = 0;
2220 return 0;
2221}
2222
2223static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req,
2224 struct xdr_stream *xdr,
2225 void *data)
2226{
2227 struct nfs_fsinfo *result = data;
2228 enum nfs_stat status;
2229 int error;
2230
2231 error = decode_nfsstat3(xdr, &status);
2232 if (unlikely(error))
2233 goto out;
2234 error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req));
2235 if (unlikely(error))
2236 goto out;
2237 if (status != NFS3_OK)
2238 goto out_status;
2239 error = decode_fsinfo3resok(xdr, result);
2240out:
2241 return error;
2242out_status:
2243 return nfs_stat_to_errno(status);
2244}
2245
2246/*
2247 * 3.3.20 PATHCONF3res
2248 *
2249 * struct PATHCONF3resok {
2250 * post_op_attr obj_attributes;
2251 * uint32 linkmax;
2252 * uint32 name_max;
2253 * bool no_trunc;
2254 * bool chown_restricted;
2255 * bool case_insensitive;
2256 * bool case_preserving;
2257 * };
2258 *
2259 * struct PATHCONF3resfail {
2260 * post_op_attr obj_attributes;
2261 * };
2262 *
2263 * union PATHCONF3res switch (nfsstat3 status) {
2264 * case NFS3_OK:
2265 * PATHCONF3resok resok;
2266 * default:
2267 * PATHCONF3resfail resfail;
2268 * };
2269 */
2270static int decode_pathconf3resok(struct xdr_stream *xdr,
2271 struct nfs_pathconf *result)
2272{
2273 __be32 *p;
2274
2275 p = xdr_inline_decode(xdr, 4 * 6);
2276 if (unlikely(!p))
2277 return -EIO;
2278 result->max_link = be32_to_cpup(p++);
2279 result->max_namelen = be32_to_cpup(p);
2280 /* ignore remaining fields */
2281 return 0;
2282}
2283
2284static int nfs3_xdr_dec_pathconf3res(struct rpc_rqst *req,
2285 struct xdr_stream *xdr,
2286 void *data)
2287{
2288 struct nfs_pathconf *result = data;
2289 enum nfs_stat status;
2290 int error;
2291
2292 error = decode_nfsstat3(xdr, &status);
2293 if (unlikely(error))
2294 goto out;
2295 error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req));
2296 if (unlikely(error))
2297 goto out;
2298 if (status != NFS3_OK)
2299 goto out_status;
2300 error = decode_pathconf3resok(xdr, result);
2301out:
2302 return error;
2303out_status:
2304 return nfs_stat_to_errno(status);
2305}
2306
2307/*
2308 * 3.3.21 COMMIT3res
2309 *
2310 * struct COMMIT3resok {
2311 * wcc_data file_wcc;
2312 * writeverf3 verf;
2313 * };
2314 *
2315 * struct COMMIT3resfail {
2316 * wcc_data file_wcc;
2317 * };
2318 *
2319 * union COMMIT3res switch (nfsstat3 status) {
2320 * case NFS3_OK:
2321 * COMMIT3resok resok;
2322 * default:
2323 * COMMIT3resfail resfail;
2324 * };
2325 */
2326static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req,
2327 struct xdr_stream *xdr,
2328 void *data)
2329{
2330 struct nfs_commitres *result = data;
2331 struct nfs_writeverf *verf = result->verf;
2332 enum nfs_stat status;
2333 int error;
2334
2335 error = decode_nfsstat3(xdr, &status);
2336 if (unlikely(error))
2337 goto out;
2338 error = decode_wcc_data(xdr, result->fattr, rpc_rqst_userns(req));
2339 if (unlikely(error))
2340 goto out;
2341 result->op_status = status;
2342 if (status != NFS3_OK)
2343 goto out_status;
2344 error = decode_writeverf3(xdr, &verf->verifier);
2345 if (!error)
2346 verf->committed = NFS_FILE_SYNC;
2347out:
2348 return error;
2349out_status:
2350 return nfs_stat_to_errno(status);
2351}
2352
2353#ifdef CONFIG_NFS_V3_ACL
2354
2355static inline int decode_getacl3resok(struct xdr_stream *xdr,
2356 struct nfs3_getaclres *result,
2357 struct user_namespace *userns)
2358{
2359 struct posix_acl **acl;
2360 unsigned int *aclcnt;
2361 size_t hdrlen;
2362 int error;
2363
2364 error = decode_post_op_attr(xdr, result->fattr, userns);
2365 if (unlikely(error))
2366 goto out;
2367 error = decode_uint32(xdr, &result->mask);
2368 if (unlikely(error))
2369 goto out;
2370 error = -EINVAL;
2371 if (result->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
2372 goto out;
2373
2374 hdrlen = xdr_stream_pos(xdr);
2375
2376 acl = NULL;
2377 if (result->mask & NFS_ACL)
2378 acl = &result->acl_access;
2379 aclcnt = NULL;
2380 if (result->mask & NFS_ACLCNT)
2381 aclcnt = &result->acl_access_count;
2382 error = nfsacl_decode(xdr->buf, hdrlen, aclcnt, acl);
2383 if (unlikely(error <= 0))
2384 goto out;
2385
2386 acl = NULL;
2387 if (result->mask & NFS_DFACL)
2388 acl = &result->acl_default;
2389 aclcnt = NULL;
2390 if (result->mask & NFS_DFACLCNT)
2391 aclcnt = &result->acl_default_count;
2392 error = nfsacl_decode(xdr->buf, hdrlen + error, aclcnt, acl);
2393 if (unlikely(error <= 0))
2394 return error;
2395 error = 0;
2396out:
2397 return error;
2398}
2399
2400static int nfs3_xdr_dec_getacl3res(struct rpc_rqst *req,
2401 struct xdr_stream *xdr,
2402 void *result)
2403{
2404 enum nfs_stat status;
2405 int error;
2406
2407 error = decode_nfsstat3(xdr, &status);
2408 if (unlikely(error))
2409 goto out;
2410 if (status != NFS3_OK)
2411 goto out_default;
2412 error = decode_getacl3resok(xdr, result, rpc_rqst_userns(req));
2413out:
2414 return error;
2415out_default:
2416 return nfs_stat_to_errno(status);
2417}
2418
2419static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req,
2420 struct xdr_stream *xdr,
2421 void *result)
2422{
2423 enum nfs_stat status;
2424 int error;
2425
2426 error = decode_nfsstat3(xdr, &status);
2427 if (unlikely(error))
2428 goto out;
2429 if (status != NFS3_OK)
2430 goto out_default;
2431 error = decode_post_op_attr(xdr, result, rpc_rqst_userns(req));
2432out:
2433 return error;
2434out_default:
2435 return nfs_stat_to_errno(status);
2436}
2437
2438#endif /* CONFIG_NFS_V3_ACL */
2439
2440#define PROC(proc, argtype, restype, timer) \
2441[NFS3PROC_##proc] = { \
2442 .p_proc = NFS3PROC_##proc, \
2443 .p_encode = nfs3_xdr_enc_##argtype##3args, \
2444 .p_decode = nfs3_xdr_dec_##restype##3res, \
2445 .p_arglen = NFS3_##argtype##args_sz, \
2446 .p_replen = NFS3_##restype##res_sz, \
2447 .p_timer = timer, \
2448 .p_statidx = NFS3PROC_##proc, \
2449 .p_name = #proc, \
2450 }
2451
2452const struct rpc_procinfo nfs3_procedures[] = {
2453 PROC(GETATTR, getattr, getattr, 1),
2454 PROC(SETATTR, setattr, setattr, 0),
2455 PROC(LOOKUP, lookup, lookup, 2),
2456 PROC(ACCESS, access, access, 1),
2457 PROC(READLINK, readlink, readlink, 3),
2458 PROC(READ, read, read, 3),
2459 PROC(WRITE, write, write, 4),
2460 PROC(CREATE, create, create, 0),
2461 PROC(MKDIR, mkdir, create, 0),
2462 PROC(SYMLINK, symlink, create, 0),
2463 PROC(MKNOD, mknod, create, 0),
2464 PROC(REMOVE, remove, remove, 0),
2465 PROC(RMDIR, lookup, setattr, 0),
2466 PROC(RENAME, rename, rename, 0),
2467 PROC(LINK, link, link, 0),
2468 PROC(READDIR, readdir, readdir, 3),
2469 PROC(READDIRPLUS, readdirplus, readdir, 3),
2470 PROC(FSSTAT, getattr, fsstat, 0),
2471 PROC(FSINFO, getattr, fsinfo, 0),
2472 PROC(PATHCONF, getattr, pathconf, 0),
2473 PROC(COMMIT, commit, commit, 5),
2474};
2475
2476static unsigned int nfs_version3_counts[ARRAY_SIZE(nfs3_procedures)];
2477const struct rpc_version nfs_version3 = {
2478 .number = 3,
2479 .nrprocs = ARRAY_SIZE(nfs3_procedures),
2480 .procs = nfs3_procedures,
2481 .counts = nfs_version3_counts,
2482};
2483
2484#ifdef CONFIG_NFS_V3_ACL
2485static const struct rpc_procinfo nfs3_acl_procedures[] = {
2486 [ACLPROC3_GETACL] = {
2487 .p_proc = ACLPROC3_GETACL,
2488 .p_encode = nfs3_xdr_enc_getacl3args,
2489 .p_decode = nfs3_xdr_dec_getacl3res,
2490 .p_arglen = ACL3_getaclargs_sz,
2491 .p_replen = ACL3_getaclres_sz,
2492 .p_timer = 1,
2493 .p_name = "GETACL",
2494 },
2495 [ACLPROC3_SETACL] = {
2496 .p_proc = ACLPROC3_SETACL,
2497 .p_encode = nfs3_xdr_enc_setacl3args,
2498 .p_decode = nfs3_xdr_dec_setacl3res,
2499 .p_arglen = ACL3_setaclargs_sz,
2500 .p_replen = ACL3_setaclres_sz,
2501 .p_timer = 0,
2502 .p_name = "SETACL",
2503 },
2504};
2505
2506static unsigned int nfs3_acl_counts[ARRAY_SIZE(nfs3_acl_procedures)];
2507const struct rpc_version nfsacl_version3 = {
2508 .number = 3,
2509 .nrprocs = ARRAY_SIZE(nfs3_acl_procedures),
2510 .procs = nfs3_acl_procedures,
2511 .counts = nfs3_acl_counts,
2512};
2513#endif /* CONFIG_NFS_V3_ACL */