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1/*
2 * linux/fs/nfs/nfs3xdr.c
3 *
4 * XDR functions to encode/decode NFSv3 RPC arguments and results.
5 *
6 * Copyright (C) 1996, 1997 Olaf Kirch
7 */
8
9#include <linux/param.h>
10#include <linux/time.h>
11#include <linux/mm.h>
12#include <linux/errno.h>
13#include <linux/string.h>
14#include <linux/in.h>
15#include <linux/pagemap.h>
16#include <linux/proc_fs.h>
17#include <linux/kdev_t.h>
18#include <linux/sunrpc/clnt.h>
19#include <linux/nfs.h>
20#include <linux/nfs3.h>
21#include <linux/nfs_fs.h>
22#include <linux/nfsacl.h>
23#include "internal.h"
24
25#define NFSDBG_FACILITY NFSDBG_XDR
26
27/* Mapping from NFS error code to "errno" error code. */
28#define errno_NFSERR_IO EIO
29
30/*
31 * Declare the space requirements for NFS arguments and replies as
32 * number of 32bit-words
33 */
34#define NFS3_fhandle_sz (1+16)
35#define NFS3_fh_sz (NFS3_fhandle_sz) /* shorthand */
36#define NFS3_sattr_sz (15)
37#define NFS3_filename_sz (1+(NFS3_MAXNAMLEN>>2))
38#define NFS3_path_sz (1+(NFS3_MAXPATHLEN>>2))
39#define NFS3_fattr_sz (21)
40#define NFS3_cookieverf_sz (NFS3_COOKIEVERFSIZE>>2)
41#define NFS3_wcc_attr_sz (6)
42#define NFS3_pre_op_attr_sz (1+NFS3_wcc_attr_sz)
43#define NFS3_post_op_attr_sz (1+NFS3_fattr_sz)
44#define NFS3_wcc_data_sz (NFS3_pre_op_attr_sz+NFS3_post_op_attr_sz)
45#define NFS3_diropargs_sz (NFS3_fh_sz+NFS3_filename_sz)
46
47#define NFS3_getattrargs_sz (NFS3_fh_sz)
48#define NFS3_setattrargs_sz (NFS3_fh_sz+NFS3_sattr_sz+3)
49#define NFS3_lookupargs_sz (NFS3_fh_sz+NFS3_filename_sz)
50#define NFS3_accessargs_sz (NFS3_fh_sz+1)
51#define NFS3_readlinkargs_sz (NFS3_fh_sz)
52#define NFS3_readargs_sz (NFS3_fh_sz+3)
53#define NFS3_writeargs_sz (NFS3_fh_sz+5)
54#define NFS3_createargs_sz (NFS3_diropargs_sz+NFS3_sattr_sz)
55#define NFS3_mkdirargs_sz (NFS3_diropargs_sz+NFS3_sattr_sz)
56#define NFS3_symlinkargs_sz (NFS3_diropargs_sz+1+NFS3_sattr_sz)
57#define NFS3_mknodargs_sz (NFS3_diropargs_sz+2+NFS3_sattr_sz)
58#define NFS3_removeargs_sz (NFS3_fh_sz+NFS3_filename_sz)
59#define NFS3_renameargs_sz (NFS3_diropargs_sz+NFS3_diropargs_sz)
60#define NFS3_linkargs_sz (NFS3_fh_sz+NFS3_diropargs_sz)
61#define NFS3_readdirargs_sz (NFS3_fh_sz+NFS3_cookieverf_sz+3)
62#define NFS3_readdirplusargs_sz (NFS3_fh_sz+NFS3_cookieverf_sz+4)
63#define NFS3_commitargs_sz (NFS3_fh_sz+3)
64
65#define NFS3_getattrres_sz (1+NFS3_fattr_sz)
66#define NFS3_setattrres_sz (1+NFS3_wcc_data_sz)
67#define NFS3_removeres_sz (NFS3_setattrres_sz)
68#define NFS3_lookupres_sz (1+NFS3_fh_sz+(2 * NFS3_post_op_attr_sz))
69#define NFS3_accessres_sz (1+NFS3_post_op_attr_sz+1)
70#define NFS3_readlinkres_sz (1+NFS3_post_op_attr_sz+1)
71#define NFS3_readres_sz (1+NFS3_post_op_attr_sz+3)
72#define NFS3_writeres_sz (1+NFS3_wcc_data_sz+4)
73#define NFS3_createres_sz (1+NFS3_fh_sz+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
74#define NFS3_renameres_sz (1+(2 * NFS3_wcc_data_sz))
75#define NFS3_linkres_sz (1+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
76#define NFS3_readdirres_sz (1+NFS3_post_op_attr_sz+2)
77#define NFS3_fsstatres_sz (1+NFS3_post_op_attr_sz+13)
78#define NFS3_fsinfores_sz (1+NFS3_post_op_attr_sz+12)
79#define NFS3_pathconfres_sz (1+NFS3_post_op_attr_sz+6)
80#define NFS3_commitres_sz (1+NFS3_wcc_data_sz+2)
81
82#define ACL3_getaclargs_sz (NFS3_fh_sz+1)
83#define ACL3_setaclargs_sz (NFS3_fh_sz+1+ \
84 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
85#define ACL3_getaclres_sz (1+NFS3_post_op_attr_sz+1+ \
86 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
87#define ACL3_setaclres_sz (1+NFS3_post_op_attr_sz)
88
89/*
90 * Map file type to S_IFMT bits
91 */
92static const umode_t nfs_type2fmt[] = {
93 [NF3BAD] = 0,
94 [NF3REG] = S_IFREG,
95 [NF3DIR] = S_IFDIR,
96 [NF3BLK] = S_IFBLK,
97 [NF3CHR] = S_IFCHR,
98 [NF3LNK] = S_IFLNK,
99 [NF3SOCK] = S_IFSOCK,
100 [NF3FIFO] = S_IFIFO,
101};
102
103/*
104 * While encoding arguments, set up the reply buffer in advance to
105 * receive reply data directly into the page cache.
106 */
107static void prepare_reply_buffer(struct rpc_rqst *req, struct page **pages,
108 unsigned int base, unsigned int len,
109 unsigned int bufsize)
110{
111 struct rpc_auth *auth = req->rq_cred->cr_auth;
112 unsigned int replen;
113
114 replen = RPC_REPHDRSIZE + auth->au_rslack + bufsize;
115 xdr_inline_pages(&req->rq_rcv_buf, replen << 2, pages, base, len);
116}
117
118/*
119 * Handle decode buffer overflows out-of-line.
120 */
121static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
122{
123 dprintk("NFS: %s prematurely hit the end of our receive buffer. "
124 "Remaining buffer length is %tu words.\n",
125 func, xdr->end - xdr->p);
126}
127
128
129/*
130 * Encode/decode NFSv3 basic data types
131 *
132 * Basic NFSv3 data types are defined in section 2.5 of RFC 1813:
133 * "NFS Version 3 Protocol Specification".
134 *
135 * Not all basic data types have their own encoding and decoding
136 * functions. For run-time efficiency, some data types are encoded
137 * or decoded inline.
138 */
139
140static void encode_uint32(struct xdr_stream *xdr, u32 value)
141{
142 __be32 *p = xdr_reserve_space(xdr, 4);
143 *p = cpu_to_be32(value);
144}
145
146static int decode_uint32(struct xdr_stream *xdr, u32 *value)
147{
148 __be32 *p;
149
150 p = xdr_inline_decode(xdr, 4);
151 if (unlikely(p == NULL))
152 goto out_overflow;
153 *value = be32_to_cpup(p);
154 return 0;
155out_overflow:
156 print_overflow_msg(__func__, xdr);
157 return -EIO;
158}
159
160static int decode_uint64(struct xdr_stream *xdr, u64 *value)
161{
162 __be32 *p;
163
164 p = xdr_inline_decode(xdr, 8);
165 if (unlikely(p == NULL))
166 goto out_overflow;
167 xdr_decode_hyper(p, value);
168 return 0;
169out_overflow:
170 print_overflow_msg(__func__, xdr);
171 return -EIO;
172}
173
174/*
175 * fileid3
176 *
177 * typedef uint64 fileid3;
178 */
179static __be32 *xdr_decode_fileid3(__be32 *p, u64 *fileid)
180{
181 return xdr_decode_hyper(p, fileid);
182}
183
184static int decode_fileid3(struct xdr_stream *xdr, u64 *fileid)
185{
186 return decode_uint64(xdr, fileid);
187}
188
189/*
190 * filename3
191 *
192 * typedef string filename3<>;
193 */
194static void encode_filename3(struct xdr_stream *xdr,
195 const char *name, u32 length)
196{
197 __be32 *p;
198
199 BUG_ON(length > NFS3_MAXNAMLEN);
200 p = xdr_reserve_space(xdr, 4 + length);
201 xdr_encode_opaque(p, name, length);
202}
203
204static int decode_inline_filename3(struct xdr_stream *xdr,
205 const char **name, u32 *length)
206{
207 __be32 *p;
208 u32 count;
209
210 p = xdr_inline_decode(xdr, 4);
211 if (unlikely(p == NULL))
212 goto out_overflow;
213 count = be32_to_cpup(p);
214 if (count > NFS3_MAXNAMLEN)
215 goto out_nametoolong;
216 p = xdr_inline_decode(xdr, count);
217 if (unlikely(p == NULL))
218 goto out_overflow;
219 *name = (const char *)p;
220 *length = count;
221 return 0;
222
223out_nametoolong:
224 dprintk("NFS: returned filename too long: %u\n", count);
225 return -ENAMETOOLONG;
226out_overflow:
227 print_overflow_msg(__func__, xdr);
228 return -EIO;
229}
230
231/*
232 * nfspath3
233 *
234 * typedef string nfspath3<>;
235 */
236static void encode_nfspath3(struct xdr_stream *xdr, struct page **pages,
237 const u32 length)
238{
239 BUG_ON(length > NFS3_MAXPATHLEN);
240 encode_uint32(xdr, length);
241 xdr_write_pages(xdr, pages, 0, length);
242}
243
244static int decode_nfspath3(struct xdr_stream *xdr)
245{
246 u32 recvd, count;
247 size_t hdrlen;
248 __be32 *p;
249
250 p = xdr_inline_decode(xdr, 4);
251 if (unlikely(p == NULL))
252 goto out_overflow;
253 count = be32_to_cpup(p);
254 if (unlikely(count >= xdr->buf->page_len || count > NFS3_MAXPATHLEN))
255 goto out_nametoolong;
256 hdrlen = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base;
257 recvd = xdr->buf->len - hdrlen;
258 if (unlikely(count > recvd))
259 goto out_cheating;
260
261 xdr_read_pages(xdr, count);
262 xdr_terminate_string(xdr->buf, count);
263 return 0;
264
265out_nametoolong:
266 dprintk("NFS: returned pathname too long: %u\n", count);
267 return -ENAMETOOLONG;
268out_cheating:
269 dprintk("NFS: server cheating in pathname result: "
270 "count %u > recvd %u\n", count, recvd);
271 return -EIO;
272out_overflow:
273 print_overflow_msg(__func__, xdr);
274 return -EIO;
275}
276
277/*
278 * cookie3
279 *
280 * typedef uint64 cookie3
281 */
282static __be32 *xdr_encode_cookie3(__be32 *p, u64 cookie)
283{
284 return xdr_encode_hyper(p, cookie);
285}
286
287static int decode_cookie3(struct xdr_stream *xdr, u64 *cookie)
288{
289 return decode_uint64(xdr, cookie);
290}
291
292/*
293 * cookieverf3
294 *
295 * typedef opaque cookieverf3[NFS3_COOKIEVERFSIZE];
296 */
297static __be32 *xdr_encode_cookieverf3(__be32 *p, const __be32 *verifier)
298{
299 memcpy(p, verifier, NFS3_COOKIEVERFSIZE);
300 return p + XDR_QUADLEN(NFS3_COOKIEVERFSIZE);
301}
302
303static int decode_cookieverf3(struct xdr_stream *xdr, __be32 *verifier)
304{
305 __be32 *p;
306
307 p = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE);
308 if (unlikely(p == NULL))
309 goto out_overflow;
310 memcpy(verifier, p, NFS3_COOKIEVERFSIZE);
311 return 0;
312out_overflow:
313 print_overflow_msg(__func__, xdr);
314 return -EIO;
315}
316
317/*
318 * createverf3
319 *
320 * typedef opaque createverf3[NFS3_CREATEVERFSIZE];
321 */
322static void encode_createverf3(struct xdr_stream *xdr, const __be32 *verifier)
323{
324 __be32 *p;
325
326 p = xdr_reserve_space(xdr, NFS3_CREATEVERFSIZE);
327 memcpy(p, verifier, NFS3_CREATEVERFSIZE);
328}
329
330static int decode_writeverf3(struct xdr_stream *xdr, __be32 *verifier)
331{
332 __be32 *p;
333
334 p = xdr_inline_decode(xdr, NFS3_WRITEVERFSIZE);
335 if (unlikely(p == NULL))
336 goto out_overflow;
337 memcpy(verifier, p, NFS3_WRITEVERFSIZE);
338 return 0;
339out_overflow:
340 print_overflow_msg(__func__, xdr);
341 return -EIO;
342}
343
344/*
345 * size3
346 *
347 * typedef uint64 size3;
348 */
349static __be32 *xdr_decode_size3(__be32 *p, u64 *size)
350{
351 return xdr_decode_hyper(p, size);
352}
353
354/*
355 * nfsstat3
356 *
357 * enum nfsstat3 {
358 * NFS3_OK = 0,
359 * ...
360 * }
361 */
362#define NFS3_OK NFS_OK
363
364static int decode_nfsstat3(struct xdr_stream *xdr, enum nfs_stat *status)
365{
366 __be32 *p;
367
368 p = xdr_inline_decode(xdr, 4);
369 if (unlikely(p == NULL))
370 goto out_overflow;
371 *status = be32_to_cpup(p);
372 return 0;
373out_overflow:
374 print_overflow_msg(__func__, xdr);
375 return -EIO;
376}
377
378/*
379 * ftype3
380 *
381 * enum ftype3 {
382 * NF3REG = 1,
383 * NF3DIR = 2,
384 * NF3BLK = 3,
385 * NF3CHR = 4,
386 * NF3LNK = 5,
387 * NF3SOCK = 6,
388 * NF3FIFO = 7
389 * };
390 */
391static void encode_ftype3(struct xdr_stream *xdr, const u32 type)
392{
393 BUG_ON(type > NF3FIFO);
394 encode_uint32(xdr, type);
395}
396
397static __be32 *xdr_decode_ftype3(__be32 *p, umode_t *mode)
398{
399 u32 type;
400
401 type = be32_to_cpup(p++);
402 if (type > NF3FIFO)
403 type = NF3NON;
404 *mode = nfs_type2fmt[type];
405 return p;
406}
407
408/*
409 * specdata3
410 *
411 * struct specdata3 {
412 * uint32 specdata1;
413 * uint32 specdata2;
414 * };
415 */
416static void encode_specdata3(struct xdr_stream *xdr, const dev_t rdev)
417{
418 __be32 *p;
419
420 p = xdr_reserve_space(xdr, 8);
421 *p++ = cpu_to_be32(MAJOR(rdev));
422 *p = cpu_to_be32(MINOR(rdev));
423}
424
425static __be32 *xdr_decode_specdata3(__be32 *p, dev_t *rdev)
426{
427 unsigned int major, minor;
428
429 major = be32_to_cpup(p++);
430 minor = be32_to_cpup(p++);
431 *rdev = MKDEV(major, minor);
432 if (MAJOR(*rdev) != major || MINOR(*rdev) != minor)
433 *rdev = 0;
434 return p;
435}
436
437/*
438 * nfs_fh3
439 *
440 * struct nfs_fh3 {
441 * opaque data<NFS3_FHSIZE>;
442 * };
443 */
444static void encode_nfs_fh3(struct xdr_stream *xdr, const struct nfs_fh *fh)
445{
446 __be32 *p;
447
448 BUG_ON(fh->size > NFS3_FHSIZE);
449 p = xdr_reserve_space(xdr, 4 + fh->size);
450 xdr_encode_opaque(p, fh->data, fh->size);
451}
452
453static int decode_nfs_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
454{
455 u32 length;
456 __be32 *p;
457
458 p = xdr_inline_decode(xdr, 4);
459 if (unlikely(p == NULL))
460 goto out_overflow;
461 length = be32_to_cpup(p++);
462 if (unlikely(length > NFS3_FHSIZE))
463 goto out_toobig;
464 p = xdr_inline_decode(xdr, length);
465 if (unlikely(p == NULL))
466 goto out_overflow;
467 fh->size = length;
468 memcpy(fh->data, p, length);
469 return 0;
470out_toobig:
471 dprintk("NFS: file handle size (%u) too big\n", length);
472 return -E2BIG;
473out_overflow:
474 print_overflow_msg(__func__, xdr);
475 return -EIO;
476}
477
478static void zero_nfs_fh3(struct nfs_fh *fh)
479{
480 memset(fh, 0, sizeof(*fh));
481}
482
483/*
484 * nfstime3
485 *
486 * struct nfstime3 {
487 * uint32 seconds;
488 * uint32 nseconds;
489 * };
490 */
491static __be32 *xdr_encode_nfstime3(__be32 *p, const struct timespec *timep)
492{
493 *p++ = cpu_to_be32(timep->tv_sec);
494 *p++ = cpu_to_be32(timep->tv_nsec);
495 return p;
496}
497
498static __be32 *xdr_decode_nfstime3(__be32 *p, struct timespec *timep)
499{
500 timep->tv_sec = be32_to_cpup(p++);
501 timep->tv_nsec = be32_to_cpup(p++);
502 return p;
503}
504
505/*
506 * sattr3
507 *
508 * enum time_how {
509 * DONT_CHANGE = 0,
510 * SET_TO_SERVER_TIME = 1,
511 * SET_TO_CLIENT_TIME = 2
512 * };
513 *
514 * union set_mode3 switch (bool set_it) {
515 * case TRUE:
516 * mode3 mode;
517 * default:
518 * void;
519 * };
520 *
521 * union set_uid3 switch (bool set_it) {
522 * case TRUE:
523 * uid3 uid;
524 * default:
525 * void;
526 * };
527 *
528 * union set_gid3 switch (bool set_it) {
529 * case TRUE:
530 * gid3 gid;
531 * default:
532 * void;
533 * };
534 *
535 * union set_size3 switch (bool set_it) {
536 * case TRUE:
537 * size3 size;
538 * default:
539 * void;
540 * };
541 *
542 * union set_atime switch (time_how set_it) {
543 * case SET_TO_CLIENT_TIME:
544 * nfstime3 atime;
545 * default:
546 * void;
547 * };
548 *
549 * union set_mtime switch (time_how set_it) {
550 * case SET_TO_CLIENT_TIME:
551 * nfstime3 mtime;
552 * default:
553 * void;
554 * };
555 *
556 * struct sattr3 {
557 * set_mode3 mode;
558 * set_uid3 uid;
559 * set_gid3 gid;
560 * set_size3 size;
561 * set_atime atime;
562 * set_mtime mtime;
563 * };
564 */
565static void encode_sattr3(struct xdr_stream *xdr, const struct iattr *attr)
566{
567 u32 nbytes;
568 __be32 *p;
569
570 /*
571 * In order to make only a single xdr_reserve_space() call,
572 * pre-compute the total number of bytes to be reserved.
573 * Six boolean values, one for each set_foo field, are always
574 * present in the encoded result, so start there.
575 */
576 nbytes = 6 * 4;
577 if (attr->ia_valid & ATTR_MODE)
578 nbytes += 4;
579 if (attr->ia_valid & ATTR_UID)
580 nbytes += 4;
581 if (attr->ia_valid & ATTR_GID)
582 nbytes += 4;
583 if (attr->ia_valid & ATTR_SIZE)
584 nbytes += 8;
585 if (attr->ia_valid & ATTR_ATIME_SET)
586 nbytes += 8;
587 if (attr->ia_valid & ATTR_MTIME_SET)
588 nbytes += 8;
589 p = xdr_reserve_space(xdr, nbytes);
590
591 if (attr->ia_valid & ATTR_MODE) {
592 *p++ = xdr_one;
593 *p++ = cpu_to_be32(attr->ia_mode & S_IALLUGO);
594 } else
595 *p++ = xdr_zero;
596
597 if (attr->ia_valid & ATTR_UID) {
598 *p++ = xdr_one;
599 *p++ = cpu_to_be32(attr->ia_uid);
600 } else
601 *p++ = xdr_zero;
602
603 if (attr->ia_valid & ATTR_GID) {
604 *p++ = xdr_one;
605 *p++ = cpu_to_be32(attr->ia_gid);
606 } else
607 *p++ = xdr_zero;
608
609 if (attr->ia_valid & ATTR_SIZE) {
610 *p++ = xdr_one;
611 p = xdr_encode_hyper(p, (u64)attr->ia_size);
612 } else
613 *p++ = xdr_zero;
614
615 if (attr->ia_valid & ATTR_ATIME_SET) {
616 *p++ = xdr_two;
617 p = xdr_encode_nfstime3(p, &attr->ia_atime);
618 } else if (attr->ia_valid & ATTR_ATIME) {
619 *p++ = xdr_one;
620 } else
621 *p++ = xdr_zero;
622
623 if (attr->ia_valid & ATTR_MTIME_SET) {
624 *p++ = xdr_two;
625 xdr_encode_nfstime3(p, &attr->ia_mtime);
626 } else if (attr->ia_valid & ATTR_MTIME) {
627 *p = xdr_one;
628 } else
629 *p = xdr_zero;
630}
631
632/*
633 * fattr3
634 *
635 * struct fattr3 {
636 * ftype3 type;
637 * mode3 mode;
638 * uint32 nlink;
639 * uid3 uid;
640 * gid3 gid;
641 * size3 size;
642 * size3 used;
643 * specdata3 rdev;
644 * uint64 fsid;
645 * fileid3 fileid;
646 * nfstime3 atime;
647 * nfstime3 mtime;
648 * nfstime3 ctime;
649 * };
650 */
651static int decode_fattr3(struct xdr_stream *xdr, struct nfs_fattr *fattr)
652{
653 umode_t fmode;
654 __be32 *p;
655
656 p = xdr_inline_decode(xdr, NFS3_fattr_sz << 2);
657 if (unlikely(p == NULL))
658 goto out_overflow;
659
660 p = xdr_decode_ftype3(p, &fmode);
661
662 fattr->mode = (be32_to_cpup(p++) & ~S_IFMT) | fmode;
663 fattr->nlink = be32_to_cpup(p++);
664 fattr->uid = be32_to_cpup(p++);
665 fattr->gid = be32_to_cpup(p++);
666
667 p = xdr_decode_size3(p, &fattr->size);
668 p = xdr_decode_size3(p, &fattr->du.nfs3.used);
669 p = xdr_decode_specdata3(p, &fattr->rdev);
670
671 p = xdr_decode_hyper(p, &fattr->fsid.major);
672 fattr->fsid.minor = 0;
673
674 p = xdr_decode_fileid3(p, &fattr->fileid);
675 p = xdr_decode_nfstime3(p, &fattr->atime);
676 p = xdr_decode_nfstime3(p, &fattr->mtime);
677 xdr_decode_nfstime3(p, &fattr->ctime);
678
679 fattr->valid |= NFS_ATTR_FATTR_V3;
680 return 0;
681out_overflow:
682 print_overflow_msg(__func__, xdr);
683 return -EIO;
684}
685
686/*
687 * post_op_attr
688 *
689 * union post_op_attr switch (bool attributes_follow) {
690 * case TRUE:
691 * fattr3 attributes;
692 * case FALSE:
693 * void;
694 * };
695 */
696static int decode_post_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
697{
698 __be32 *p;
699
700 p = xdr_inline_decode(xdr, 4);
701 if (unlikely(p == NULL))
702 goto out_overflow;
703 if (*p != xdr_zero)
704 return decode_fattr3(xdr, fattr);
705 return 0;
706out_overflow:
707 print_overflow_msg(__func__, xdr);
708 return -EIO;
709}
710
711/*
712 * wcc_attr
713 * struct wcc_attr {
714 * size3 size;
715 * nfstime3 mtime;
716 * nfstime3 ctime;
717 * };
718 */
719static int decode_wcc_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
720{
721 __be32 *p;
722
723 p = xdr_inline_decode(xdr, NFS3_wcc_attr_sz << 2);
724 if (unlikely(p == NULL))
725 goto out_overflow;
726
727 fattr->valid |= NFS_ATTR_FATTR_PRESIZE
728 | NFS_ATTR_FATTR_PREMTIME
729 | NFS_ATTR_FATTR_PRECTIME;
730
731 p = xdr_decode_size3(p, &fattr->pre_size);
732 p = xdr_decode_nfstime3(p, &fattr->pre_mtime);
733 xdr_decode_nfstime3(p, &fattr->pre_ctime);
734
735 return 0;
736out_overflow:
737 print_overflow_msg(__func__, xdr);
738 return -EIO;
739}
740
741/*
742 * pre_op_attr
743 * union pre_op_attr switch (bool attributes_follow) {
744 * case TRUE:
745 * wcc_attr attributes;
746 * case FALSE:
747 * void;
748 * };
749 *
750 * wcc_data
751 *
752 * struct wcc_data {
753 * pre_op_attr before;
754 * post_op_attr after;
755 * };
756 */
757static int decode_pre_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
758{
759 __be32 *p;
760
761 p = xdr_inline_decode(xdr, 4);
762 if (unlikely(p == NULL))
763 goto out_overflow;
764 if (*p != xdr_zero)
765 return decode_wcc_attr(xdr, fattr);
766 return 0;
767out_overflow:
768 print_overflow_msg(__func__, xdr);
769 return -EIO;
770}
771
772static int decode_wcc_data(struct xdr_stream *xdr, struct nfs_fattr *fattr)
773{
774 int error;
775
776 error = decode_pre_op_attr(xdr, fattr);
777 if (unlikely(error))
778 goto out;
779 error = decode_post_op_attr(xdr, fattr);
780out:
781 return error;
782}
783
784/*
785 * post_op_fh3
786 *
787 * union post_op_fh3 switch (bool handle_follows) {
788 * case TRUE:
789 * nfs_fh3 handle;
790 * case FALSE:
791 * void;
792 * };
793 */
794static int decode_post_op_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
795{
796 __be32 *p = xdr_inline_decode(xdr, 4);
797 if (unlikely(p == NULL))
798 goto out_overflow;
799 if (*p != xdr_zero)
800 return decode_nfs_fh3(xdr, fh);
801 zero_nfs_fh3(fh);
802 return 0;
803out_overflow:
804 print_overflow_msg(__func__, xdr);
805 return -EIO;
806}
807
808/*
809 * diropargs3
810 *
811 * struct diropargs3 {
812 * nfs_fh3 dir;
813 * filename3 name;
814 * };
815 */
816static void encode_diropargs3(struct xdr_stream *xdr, const struct nfs_fh *fh,
817 const char *name, u32 length)
818{
819 encode_nfs_fh3(xdr, fh);
820 encode_filename3(xdr, name, length);
821}
822
823
824/*
825 * NFSv3 XDR encode functions
826 *
827 * NFSv3 argument types are defined in section 3.3 of RFC 1813:
828 * "NFS Version 3 Protocol Specification".
829 */
830
831/*
832 * 3.3.1 GETATTR3args
833 *
834 * struct GETATTR3args {
835 * nfs_fh3 object;
836 * };
837 */
838static void nfs3_xdr_enc_getattr3args(struct rpc_rqst *req,
839 struct xdr_stream *xdr,
840 const struct nfs_fh *fh)
841{
842 encode_nfs_fh3(xdr, fh);
843}
844
845/*
846 * 3.3.2 SETATTR3args
847 *
848 * union sattrguard3 switch (bool check) {
849 * case TRUE:
850 * nfstime3 obj_ctime;
851 * case FALSE:
852 * void;
853 * };
854 *
855 * struct SETATTR3args {
856 * nfs_fh3 object;
857 * sattr3 new_attributes;
858 * sattrguard3 guard;
859 * };
860 */
861static void encode_sattrguard3(struct xdr_stream *xdr,
862 const struct nfs3_sattrargs *args)
863{
864 __be32 *p;
865
866 if (args->guard) {
867 p = xdr_reserve_space(xdr, 4 + 8);
868 *p++ = xdr_one;
869 xdr_encode_nfstime3(p, &args->guardtime);
870 } else {
871 p = xdr_reserve_space(xdr, 4);
872 *p = xdr_zero;
873 }
874}
875
876static void nfs3_xdr_enc_setattr3args(struct rpc_rqst *req,
877 struct xdr_stream *xdr,
878 const struct nfs3_sattrargs *args)
879{
880 encode_nfs_fh3(xdr, args->fh);
881 encode_sattr3(xdr, args->sattr);
882 encode_sattrguard3(xdr, args);
883}
884
885/*
886 * 3.3.3 LOOKUP3args
887 *
888 * struct LOOKUP3args {
889 * diropargs3 what;
890 * };
891 */
892static void nfs3_xdr_enc_lookup3args(struct rpc_rqst *req,
893 struct xdr_stream *xdr,
894 const struct nfs3_diropargs *args)
895{
896 encode_diropargs3(xdr, args->fh, args->name, args->len);
897}
898
899/*
900 * 3.3.4 ACCESS3args
901 *
902 * struct ACCESS3args {
903 * nfs_fh3 object;
904 * uint32 access;
905 * };
906 */
907static void encode_access3args(struct xdr_stream *xdr,
908 const struct nfs3_accessargs *args)
909{
910 encode_nfs_fh3(xdr, args->fh);
911 encode_uint32(xdr, args->access);
912}
913
914static void nfs3_xdr_enc_access3args(struct rpc_rqst *req,
915 struct xdr_stream *xdr,
916 const struct nfs3_accessargs *args)
917{
918 encode_access3args(xdr, args);
919}
920
921/*
922 * 3.3.5 READLINK3args
923 *
924 * struct READLINK3args {
925 * nfs_fh3 symlink;
926 * };
927 */
928static void nfs3_xdr_enc_readlink3args(struct rpc_rqst *req,
929 struct xdr_stream *xdr,
930 const struct nfs3_readlinkargs *args)
931{
932 encode_nfs_fh3(xdr, args->fh);
933 prepare_reply_buffer(req, args->pages, args->pgbase,
934 args->pglen, NFS3_readlinkres_sz);
935}
936
937/*
938 * 3.3.6 READ3args
939 *
940 * struct READ3args {
941 * nfs_fh3 file;
942 * offset3 offset;
943 * count3 count;
944 * };
945 */
946static void encode_read3args(struct xdr_stream *xdr,
947 const struct nfs_readargs *args)
948{
949 __be32 *p;
950
951 encode_nfs_fh3(xdr, args->fh);
952
953 p = xdr_reserve_space(xdr, 8 + 4);
954 p = xdr_encode_hyper(p, args->offset);
955 *p = cpu_to_be32(args->count);
956}
957
958static void nfs3_xdr_enc_read3args(struct rpc_rqst *req,
959 struct xdr_stream *xdr,
960 const struct nfs_readargs *args)
961{
962 encode_read3args(xdr, args);
963 prepare_reply_buffer(req, args->pages, args->pgbase,
964 args->count, NFS3_readres_sz);
965 req->rq_rcv_buf.flags |= XDRBUF_READ;
966}
967
968/*
969 * 3.3.7 WRITE3args
970 *
971 * enum stable_how {
972 * UNSTABLE = 0,
973 * DATA_SYNC = 1,
974 * FILE_SYNC = 2
975 * };
976 *
977 * struct WRITE3args {
978 * nfs_fh3 file;
979 * offset3 offset;
980 * count3 count;
981 * stable_how stable;
982 * opaque data<>;
983 * };
984 */
985static void encode_write3args(struct xdr_stream *xdr,
986 const struct nfs_writeargs *args)
987{
988 __be32 *p;
989
990 encode_nfs_fh3(xdr, args->fh);
991
992 p = xdr_reserve_space(xdr, 8 + 4 + 4 + 4);
993 p = xdr_encode_hyper(p, args->offset);
994 *p++ = cpu_to_be32(args->count);
995 *p++ = cpu_to_be32(args->stable);
996 *p = cpu_to_be32(args->count);
997 xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
998}
999
1000static void nfs3_xdr_enc_write3args(struct rpc_rqst *req,
1001 struct xdr_stream *xdr,
1002 const struct nfs_writeargs *args)
1003{
1004 encode_write3args(xdr, args);
1005 xdr->buf->flags |= XDRBUF_WRITE;
1006}
1007
1008/*
1009 * 3.3.8 CREATE3args
1010 *
1011 * enum createmode3 {
1012 * UNCHECKED = 0,
1013 * GUARDED = 1,
1014 * EXCLUSIVE = 2
1015 * };
1016 *
1017 * union createhow3 switch (createmode3 mode) {
1018 * case UNCHECKED:
1019 * case GUARDED:
1020 * sattr3 obj_attributes;
1021 * case EXCLUSIVE:
1022 * createverf3 verf;
1023 * };
1024 *
1025 * struct CREATE3args {
1026 * diropargs3 where;
1027 * createhow3 how;
1028 * };
1029 */
1030static void encode_createhow3(struct xdr_stream *xdr,
1031 const struct nfs3_createargs *args)
1032{
1033 encode_uint32(xdr, args->createmode);
1034 switch (args->createmode) {
1035 case NFS3_CREATE_UNCHECKED:
1036 case NFS3_CREATE_GUARDED:
1037 encode_sattr3(xdr, args->sattr);
1038 break;
1039 case NFS3_CREATE_EXCLUSIVE:
1040 encode_createverf3(xdr, args->verifier);
1041 break;
1042 default:
1043 BUG();
1044 }
1045}
1046
1047static void nfs3_xdr_enc_create3args(struct rpc_rqst *req,
1048 struct xdr_stream *xdr,
1049 const struct nfs3_createargs *args)
1050{
1051 encode_diropargs3(xdr, args->fh, args->name, args->len);
1052 encode_createhow3(xdr, args);
1053}
1054
1055/*
1056 * 3.3.9 MKDIR3args
1057 *
1058 * struct MKDIR3args {
1059 * diropargs3 where;
1060 * sattr3 attributes;
1061 * };
1062 */
1063static void nfs3_xdr_enc_mkdir3args(struct rpc_rqst *req,
1064 struct xdr_stream *xdr,
1065 const struct nfs3_mkdirargs *args)
1066{
1067 encode_diropargs3(xdr, args->fh, args->name, args->len);
1068 encode_sattr3(xdr, args->sattr);
1069}
1070
1071/*
1072 * 3.3.10 SYMLINK3args
1073 *
1074 * struct symlinkdata3 {
1075 * sattr3 symlink_attributes;
1076 * nfspath3 symlink_data;
1077 * };
1078 *
1079 * struct SYMLINK3args {
1080 * diropargs3 where;
1081 * symlinkdata3 symlink;
1082 * };
1083 */
1084static void encode_symlinkdata3(struct xdr_stream *xdr,
1085 const struct nfs3_symlinkargs *args)
1086{
1087 encode_sattr3(xdr, args->sattr);
1088 encode_nfspath3(xdr, args->pages, args->pathlen);
1089}
1090
1091static void nfs3_xdr_enc_symlink3args(struct rpc_rqst *req,
1092 struct xdr_stream *xdr,
1093 const struct nfs3_symlinkargs *args)
1094{
1095 encode_diropargs3(xdr, args->fromfh, args->fromname, args->fromlen);
1096 encode_symlinkdata3(xdr, args);
1097}
1098
1099/*
1100 * 3.3.11 MKNOD3args
1101 *
1102 * struct devicedata3 {
1103 * sattr3 dev_attributes;
1104 * specdata3 spec;
1105 * };
1106 *
1107 * union mknoddata3 switch (ftype3 type) {
1108 * case NF3CHR:
1109 * case NF3BLK:
1110 * devicedata3 device;
1111 * case NF3SOCK:
1112 * case NF3FIFO:
1113 * sattr3 pipe_attributes;
1114 * default:
1115 * void;
1116 * };
1117 *
1118 * struct MKNOD3args {
1119 * diropargs3 where;
1120 * mknoddata3 what;
1121 * };
1122 */
1123static void encode_devicedata3(struct xdr_stream *xdr,
1124 const struct nfs3_mknodargs *args)
1125{
1126 encode_sattr3(xdr, args->sattr);
1127 encode_specdata3(xdr, args->rdev);
1128}
1129
1130static void encode_mknoddata3(struct xdr_stream *xdr,
1131 const struct nfs3_mknodargs *args)
1132{
1133 encode_ftype3(xdr, args->type);
1134 switch (args->type) {
1135 case NF3CHR:
1136 case NF3BLK:
1137 encode_devicedata3(xdr, args);
1138 break;
1139 case NF3SOCK:
1140 case NF3FIFO:
1141 encode_sattr3(xdr, args->sattr);
1142 break;
1143 case NF3REG:
1144 case NF3DIR:
1145 break;
1146 default:
1147 BUG();
1148 }
1149}
1150
1151static void nfs3_xdr_enc_mknod3args(struct rpc_rqst *req,
1152 struct xdr_stream *xdr,
1153 const struct nfs3_mknodargs *args)
1154{
1155 encode_diropargs3(xdr, args->fh, args->name, args->len);
1156 encode_mknoddata3(xdr, args);
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 struct nfs_removeargs *args)
1169{
1170 encode_diropargs3(xdr, args->fh, args->name.name, args->name.len);
1171}
1172
1173/*
1174 * 3.3.14 RENAME3args
1175 *
1176 * struct RENAME3args {
1177 * diropargs3 from;
1178 * diropargs3 to;
1179 * };
1180 */
1181static void nfs3_xdr_enc_rename3args(struct rpc_rqst *req,
1182 struct xdr_stream *xdr,
1183 const struct nfs_renameargs *args)
1184{
1185 const struct qstr *old = args->old_name;
1186 const struct qstr *new = args->new_name;
1187
1188 encode_diropargs3(xdr, args->old_dir, old->name, old->len);
1189 encode_diropargs3(xdr, args->new_dir, new->name, new->len);
1190}
1191
1192/*
1193 * 3.3.15 LINK3args
1194 *
1195 * struct LINK3args {
1196 * nfs_fh3 file;
1197 * diropargs3 link;
1198 * };
1199 */
1200static void nfs3_xdr_enc_link3args(struct rpc_rqst *req,
1201 struct xdr_stream *xdr,
1202 const struct nfs3_linkargs *args)
1203{
1204 encode_nfs_fh3(xdr, args->fromfh);
1205 encode_diropargs3(xdr, args->tofh, args->toname, args->tolen);
1206}
1207
1208/*
1209 * 3.3.16 READDIR3args
1210 *
1211 * struct READDIR3args {
1212 * nfs_fh3 dir;
1213 * cookie3 cookie;
1214 * cookieverf3 cookieverf;
1215 * count3 count;
1216 * };
1217 */
1218static void encode_readdir3args(struct xdr_stream *xdr,
1219 const struct nfs3_readdirargs *args)
1220{
1221 __be32 *p;
1222
1223 encode_nfs_fh3(xdr, args->fh);
1224
1225 p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4);
1226 p = xdr_encode_cookie3(p, args->cookie);
1227 p = xdr_encode_cookieverf3(p, args->verf);
1228 *p = cpu_to_be32(args->count);
1229}
1230
1231static void nfs3_xdr_enc_readdir3args(struct rpc_rqst *req,
1232 struct xdr_stream *xdr,
1233 const struct nfs3_readdirargs *args)
1234{
1235 encode_readdir3args(xdr, args);
1236 prepare_reply_buffer(req, args->pages, 0,
1237 args->count, NFS3_readdirres_sz);
1238}
1239
1240/*
1241 * 3.3.17 READDIRPLUS3args
1242 *
1243 * struct READDIRPLUS3args {
1244 * nfs_fh3 dir;
1245 * cookie3 cookie;
1246 * cookieverf3 cookieverf;
1247 * count3 dircount;
1248 * count3 maxcount;
1249 * };
1250 */
1251static void encode_readdirplus3args(struct xdr_stream *xdr,
1252 const struct nfs3_readdirargs *args)
1253{
1254 __be32 *p;
1255
1256 encode_nfs_fh3(xdr, args->fh);
1257
1258 p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4 + 4);
1259 p = xdr_encode_cookie3(p, args->cookie);
1260 p = xdr_encode_cookieverf3(p, args->verf);
1261
1262 /*
1263 * readdirplus: need dircount + buffer size.
1264 * We just make sure we make dircount big enough
1265 */
1266 *p++ = cpu_to_be32(args->count >> 3);
1267
1268 *p = cpu_to_be32(args->count);
1269}
1270
1271static void nfs3_xdr_enc_readdirplus3args(struct rpc_rqst *req,
1272 struct xdr_stream *xdr,
1273 const struct nfs3_readdirargs *args)
1274{
1275 encode_readdirplus3args(xdr, args);
1276 prepare_reply_buffer(req, args->pages, 0,
1277 args->count, NFS3_readdirres_sz);
1278}
1279
1280/*
1281 * 3.3.21 COMMIT3args
1282 *
1283 * struct COMMIT3args {
1284 * nfs_fh3 file;
1285 * offset3 offset;
1286 * count3 count;
1287 * };
1288 */
1289static void encode_commit3args(struct xdr_stream *xdr,
1290 const struct nfs_writeargs *args)
1291{
1292 __be32 *p;
1293
1294 encode_nfs_fh3(xdr, args->fh);
1295
1296 p = xdr_reserve_space(xdr, 8 + 4);
1297 p = xdr_encode_hyper(p, args->offset);
1298 *p = cpu_to_be32(args->count);
1299}
1300
1301static void nfs3_xdr_enc_commit3args(struct rpc_rqst *req,
1302 struct xdr_stream *xdr,
1303 const struct nfs_writeargs *args)
1304{
1305 encode_commit3args(xdr, args);
1306}
1307
1308#ifdef CONFIG_NFS_V3_ACL
1309
1310static void nfs3_xdr_enc_getacl3args(struct rpc_rqst *req,
1311 struct xdr_stream *xdr,
1312 const struct nfs3_getaclargs *args)
1313{
1314 encode_nfs_fh3(xdr, args->fh);
1315 encode_uint32(xdr, args->mask);
1316 if (args->mask & (NFS_ACL | NFS_DFACL))
1317 prepare_reply_buffer(req, args->pages, 0,
1318 NFSACL_MAXPAGES << PAGE_SHIFT,
1319 ACL3_getaclres_sz);
1320}
1321
1322static void nfs3_xdr_enc_setacl3args(struct rpc_rqst *req,
1323 struct xdr_stream *xdr,
1324 const struct nfs3_setaclargs *args)
1325{
1326 unsigned int base;
1327 int error;
1328
1329 encode_nfs_fh3(xdr, NFS_FH(args->inode));
1330 encode_uint32(xdr, args->mask);
1331
1332 base = req->rq_slen;
1333 if (args->npages != 0)
1334 xdr_write_pages(xdr, args->pages, 0, args->len);
1335 else
1336 xdr_reserve_space(xdr, NFS_ACL_INLINE_BUFSIZE);
1337
1338 error = nfsacl_encode(xdr->buf, base, args->inode,
1339 (args->mask & NFS_ACL) ?
1340 args->acl_access : NULL, 1, 0);
1341 BUG_ON(error < 0);
1342 error = nfsacl_encode(xdr->buf, base + error, args->inode,
1343 (args->mask & NFS_DFACL) ?
1344 args->acl_default : NULL, 1,
1345 NFS_ACL_DEFAULT);
1346 BUG_ON(error < 0);
1347}
1348
1349#endif /* CONFIG_NFS_V3_ACL */
1350
1351/*
1352 * NFSv3 XDR decode functions
1353 *
1354 * NFSv3 result types are defined in section 3.3 of RFC 1813:
1355 * "NFS Version 3 Protocol Specification".
1356 */
1357
1358/*
1359 * 3.3.1 GETATTR3res
1360 *
1361 * struct GETATTR3resok {
1362 * fattr3 obj_attributes;
1363 * };
1364 *
1365 * union GETATTR3res switch (nfsstat3 status) {
1366 * case NFS3_OK:
1367 * GETATTR3resok resok;
1368 * default:
1369 * void;
1370 * };
1371 */
1372static int nfs3_xdr_dec_getattr3res(struct rpc_rqst *req,
1373 struct xdr_stream *xdr,
1374 struct nfs_fattr *result)
1375{
1376 enum nfs_stat status;
1377 int error;
1378
1379 error = decode_nfsstat3(xdr, &status);
1380 if (unlikely(error))
1381 goto out;
1382 if (status != NFS3_OK)
1383 goto out_default;
1384 error = decode_fattr3(xdr, result);
1385out:
1386 return error;
1387out_default:
1388 return nfs_stat_to_errno(status);
1389}
1390
1391/*
1392 * 3.3.2 SETATTR3res
1393 *
1394 * struct SETATTR3resok {
1395 * wcc_data obj_wcc;
1396 * };
1397 *
1398 * struct SETATTR3resfail {
1399 * wcc_data obj_wcc;
1400 * };
1401 *
1402 * union SETATTR3res switch (nfsstat3 status) {
1403 * case NFS3_OK:
1404 * SETATTR3resok resok;
1405 * default:
1406 * SETATTR3resfail resfail;
1407 * };
1408 */
1409static int nfs3_xdr_dec_setattr3res(struct rpc_rqst *req,
1410 struct xdr_stream *xdr,
1411 struct nfs_fattr *result)
1412{
1413 enum nfs_stat status;
1414 int error;
1415
1416 error = decode_nfsstat3(xdr, &status);
1417 if (unlikely(error))
1418 goto out;
1419 error = decode_wcc_data(xdr, result);
1420 if (unlikely(error))
1421 goto out;
1422 if (status != NFS3_OK)
1423 goto out_status;
1424out:
1425 return error;
1426out_status:
1427 return nfs_stat_to_errno(status);
1428}
1429
1430/*
1431 * 3.3.3 LOOKUP3res
1432 *
1433 * struct LOOKUP3resok {
1434 * nfs_fh3 object;
1435 * post_op_attr obj_attributes;
1436 * post_op_attr dir_attributes;
1437 * };
1438 *
1439 * struct LOOKUP3resfail {
1440 * post_op_attr dir_attributes;
1441 * };
1442 *
1443 * union LOOKUP3res switch (nfsstat3 status) {
1444 * case NFS3_OK:
1445 * LOOKUP3resok resok;
1446 * default:
1447 * LOOKUP3resfail resfail;
1448 * };
1449 */
1450static int nfs3_xdr_dec_lookup3res(struct rpc_rqst *req,
1451 struct xdr_stream *xdr,
1452 struct nfs3_diropres *result)
1453{
1454 enum nfs_stat status;
1455 int error;
1456
1457 error = decode_nfsstat3(xdr, &status);
1458 if (unlikely(error))
1459 goto out;
1460 if (status != NFS3_OK)
1461 goto out_default;
1462 error = decode_nfs_fh3(xdr, result->fh);
1463 if (unlikely(error))
1464 goto out;
1465 error = decode_post_op_attr(xdr, result->fattr);
1466 if (unlikely(error))
1467 goto out;
1468 error = decode_post_op_attr(xdr, result->dir_attr);
1469out:
1470 return error;
1471out_default:
1472 error = decode_post_op_attr(xdr, result->dir_attr);
1473 if (unlikely(error))
1474 goto out;
1475 return nfs_stat_to_errno(status);
1476}
1477
1478/*
1479 * 3.3.4 ACCESS3res
1480 *
1481 * struct ACCESS3resok {
1482 * post_op_attr obj_attributes;
1483 * uint32 access;
1484 * };
1485 *
1486 * struct ACCESS3resfail {
1487 * post_op_attr obj_attributes;
1488 * };
1489 *
1490 * union ACCESS3res switch (nfsstat3 status) {
1491 * case NFS3_OK:
1492 * ACCESS3resok resok;
1493 * default:
1494 * ACCESS3resfail resfail;
1495 * };
1496 */
1497static int nfs3_xdr_dec_access3res(struct rpc_rqst *req,
1498 struct xdr_stream *xdr,
1499 struct nfs3_accessres *result)
1500{
1501 enum nfs_stat status;
1502 int error;
1503
1504 error = decode_nfsstat3(xdr, &status);
1505 if (unlikely(error))
1506 goto out;
1507 error = decode_post_op_attr(xdr, result->fattr);
1508 if (unlikely(error))
1509 goto out;
1510 if (status != NFS3_OK)
1511 goto out_default;
1512 error = decode_uint32(xdr, &result->access);
1513out:
1514 return error;
1515out_default:
1516 return nfs_stat_to_errno(status);
1517}
1518
1519/*
1520 * 3.3.5 READLINK3res
1521 *
1522 * struct READLINK3resok {
1523 * post_op_attr symlink_attributes;
1524 * nfspath3 data;
1525 * };
1526 *
1527 * struct READLINK3resfail {
1528 * post_op_attr symlink_attributes;
1529 * };
1530 *
1531 * union READLINK3res switch (nfsstat3 status) {
1532 * case NFS3_OK:
1533 * READLINK3resok resok;
1534 * default:
1535 * READLINK3resfail resfail;
1536 * };
1537 */
1538static int nfs3_xdr_dec_readlink3res(struct rpc_rqst *req,
1539 struct xdr_stream *xdr,
1540 struct nfs_fattr *result)
1541{
1542 enum nfs_stat status;
1543 int error;
1544
1545 error = decode_nfsstat3(xdr, &status);
1546 if (unlikely(error))
1547 goto out;
1548 error = decode_post_op_attr(xdr, result);
1549 if (unlikely(error))
1550 goto out;
1551 if (status != NFS3_OK)
1552 goto out_default;
1553 error = decode_nfspath3(xdr);
1554out:
1555 return error;
1556out_default:
1557 return nfs_stat_to_errno(status);
1558}
1559
1560/*
1561 * 3.3.6 READ3res
1562 *
1563 * struct READ3resok {
1564 * post_op_attr file_attributes;
1565 * count3 count;
1566 * bool eof;
1567 * opaque data<>;
1568 * };
1569 *
1570 * struct READ3resfail {
1571 * post_op_attr file_attributes;
1572 * };
1573 *
1574 * union READ3res switch (nfsstat3 status) {
1575 * case NFS3_OK:
1576 * READ3resok resok;
1577 * default:
1578 * READ3resfail resfail;
1579 * };
1580 */
1581static int decode_read3resok(struct xdr_stream *xdr,
1582 struct nfs_readres *result)
1583{
1584 u32 eof, count, ocount, recvd;
1585 size_t hdrlen;
1586 __be32 *p;
1587
1588 p = xdr_inline_decode(xdr, 4 + 4 + 4);
1589 if (unlikely(p == NULL))
1590 goto out_overflow;
1591 count = be32_to_cpup(p++);
1592 eof = be32_to_cpup(p++);
1593 ocount = be32_to_cpup(p++);
1594 if (unlikely(ocount != count))
1595 goto out_mismatch;
1596 hdrlen = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base;
1597 recvd = xdr->buf->len - hdrlen;
1598 if (unlikely(count > recvd))
1599 goto out_cheating;
1600
1601out:
1602 xdr_read_pages(xdr, count);
1603 result->eof = eof;
1604 result->count = count;
1605 return count;
1606out_mismatch:
1607 dprintk("NFS: READ count doesn't match length of opaque: "
1608 "count %u != ocount %u\n", count, ocount);
1609 return -EIO;
1610out_cheating:
1611 dprintk("NFS: server cheating in read result: "
1612 "count %u > recvd %u\n", count, recvd);
1613 count = recvd;
1614 eof = 0;
1615 goto out;
1616out_overflow:
1617 print_overflow_msg(__func__, xdr);
1618 return -EIO;
1619}
1620
1621static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1622 struct nfs_readres *result)
1623{
1624 enum nfs_stat status;
1625 int error;
1626
1627 error = decode_nfsstat3(xdr, &status);
1628 if (unlikely(error))
1629 goto out;
1630 error = decode_post_op_attr(xdr, result->fattr);
1631 if (unlikely(error))
1632 goto out;
1633 if (status != NFS3_OK)
1634 goto out_status;
1635 error = decode_read3resok(xdr, result);
1636out:
1637 return error;
1638out_status:
1639 return nfs_stat_to_errno(status);
1640}
1641
1642/*
1643 * 3.3.7 WRITE3res
1644 *
1645 * enum stable_how {
1646 * UNSTABLE = 0,
1647 * DATA_SYNC = 1,
1648 * FILE_SYNC = 2
1649 * };
1650 *
1651 * struct WRITE3resok {
1652 * wcc_data file_wcc;
1653 * count3 count;
1654 * stable_how committed;
1655 * writeverf3 verf;
1656 * };
1657 *
1658 * struct WRITE3resfail {
1659 * wcc_data file_wcc;
1660 * };
1661 *
1662 * union WRITE3res switch (nfsstat3 status) {
1663 * case NFS3_OK:
1664 * WRITE3resok resok;
1665 * default:
1666 * WRITE3resfail resfail;
1667 * };
1668 */
1669static int decode_write3resok(struct xdr_stream *xdr,
1670 struct nfs_writeres *result)
1671{
1672 __be32 *p;
1673
1674 p = xdr_inline_decode(xdr, 4 + 4 + NFS3_WRITEVERFSIZE);
1675 if (unlikely(p == NULL))
1676 goto out_overflow;
1677 result->count = be32_to_cpup(p++);
1678 result->verf->committed = be32_to_cpup(p++);
1679 if (unlikely(result->verf->committed > NFS_FILE_SYNC))
1680 goto out_badvalue;
1681 memcpy(result->verf->verifier, p, NFS3_WRITEVERFSIZE);
1682 return result->count;
1683out_badvalue:
1684 dprintk("NFS: bad stable_how value: %u\n", result->verf->committed);
1685 return -EIO;
1686out_overflow:
1687 print_overflow_msg(__func__, xdr);
1688 return -EIO;
1689}
1690
1691static int nfs3_xdr_dec_write3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1692 struct nfs_writeres *result)
1693{
1694 enum nfs_stat status;
1695 int error;
1696
1697 error = decode_nfsstat3(xdr, &status);
1698 if (unlikely(error))
1699 goto out;
1700 error = decode_wcc_data(xdr, result->fattr);
1701 if (unlikely(error))
1702 goto out;
1703 if (status != NFS3_OK)
1704 goto out_status;
1705 error = decode_write3resok(xdr, result);
1706out:
1707 return error;
1708out_status:
1709 return nfs_stat_to_errno(status);
1710}
1711
1712/*
1713 * 3.3.8 CREATE3res
1714 *
1715 * struct CREATE3resok {
1716 * post_op_fh3 obj;
1717 * post_op_attr obj_attributes;
1718 * wcc_data dir_wcc;
1719 * };
1720 *
1721 * struct CREATE3resfail {
1722 * wcc_data dir_wcc;
1723 * };
1724 *
1725 * union CREATE3res switch (nfsstat3 status) {
1726 * case NFS3_OK:
1727 * CREATE3resok resok;
1728 * default:
1729 * CREATE3resfail resfail;
1730 * };
1731 */
1732static int decode_create3resok(struct xdr_stream *xdr,
1733 struct nfs3_diropres *result)
1734{
1735 int error;
1736
1737 error = decode_post_op_fh3(xdr, result->fh);
1738 if (unlikely(error))
1739 goto out;
1740 error = decode_post_op_attr(xdr, result->fattr);
1741 if (unlikely(error))
1742 goto out;
1743 /* The server isn't required to return a file handle.
1744 * If it didn't, force the client to perform a LOOKUP
1745 * to determine the correct file handle and attribute
1746 * values for the new object. */
1747 if (result->fh->size == 0)
1748 result->fattr->valid = 0;
1749 error = decode_wcc_data(xdr, result->dir_attr);
1750out:
1751 return error;
1752}
1753
1754static int nfs3_xdr_dec_create3res(struct rpc_rqst *req,
1755 struct xdr_stream *xdr,
1756 struct nfs3_diropres *result)
1757{
1758 enum nfs_stat status;
1759 int error;
1760
1761 error = decode_nfsstat3(xdr, &status);
1762 if (unlikely(error))
1763 goto out;
1764 if (status != NFS3_OK)
1765 goto out_default;
1766 error = decode_create3resok(xdr, result);
1767out:
1768 return error;
1769out_default:
1770 error = decode_wcc_data(xdr, result->dir_attr);
1771 if (unlikely(error))
1772 goto out;
1773 return nfs_stat_to_errno(status);
1774}
1775
1776/*
1777 * 3.3.12 REMOVE3res
1778 *
1779 * struct REMOVE3resok {
1780 * wcc_data dir_wcc;
1781 * };
1782 *
1783 * struct REMOVE3resfail {
1784 * wcc_data dir_wcc;
1785 * };
1786 *
1787 * union REMOVE3res switch (nfsstat3 status) {
1788 * case NFS3_OK:
1789 * REMOVE3resok resok;
1790 * default:
1791 * REMOVE3resfail resfail;
1792 * };
1793 */
1794static int nfs3_xdr_dec_remove3res(struct rpc_rqst *req,
1795 struct xdr_stream *xdr,
1796 struct nfs_removeres *result)
1797{
1798 enum nfs_stat status;
1799 int error;
1800
1801 error = decode_nfsstat3(xdr, &status);
1802 if (unlikely(error))
1803 goto out;
1804 error = decode_wcc_data(xdr, result->dir_attr);
1805 if (unlikely(error))
1806 goto out;
1807 if (status != NFS3_OK)
1808 goto out_status;
1809out:
1810 return error;
1811out_status:
1812 return nfs_stat_to_errno(status);
1813}
1814
1815/*
1816 * 3.3.14 RENAME3res
1817 *
1818 * struct RENAME3resok {
1819 * wcc_data fromdir_wcc;
1820 * wcc_data todir_wcc;
1821 * };
1822 *
1823 * struct RENAME3resfail {
1824 * wcc_data fromdir_wcc;
1825 * wcc_data todir_wcc;
1826 * };
1827 *
1828 * union RENAME3res switch (nfsstat3 status) {
1829 * case NFS3_OK:
1830 * RENAME3resok resok;
1831 * default:
1832 * RENAME3resfail resfail;
1833 * };
1834 */
1835static int nfs3_xdr_dec_rename3res(struct rpc_rqst *req,
1836 struct xdr_stream *xdr,
1837 struct nfs_renameres *result)
1838{
1839 enum nfs_stat status;
1840 int error;
1841
1842 error = decode_nfsstat3(xdr, &status);
1843 if (unlikely(error))
1844 goto out;
1845 error = decode_wcc_data(xdr, result->old_fattr);
1846 if (unlikely(error))
1847 goto out;
1848 error = decode_wcc_data(xdr, result->new_fattr);
1849 if (unlikely(error))
1850 goto out;
1851 if (status != NFS3_OK)
1852 goto out_status;
1853out:
1854 return error;
1855out_status:
1856 return nfs_stat_to_errno(status);
1857}
1858
1859/*
1860 * 3.3.15 LINK3res
1861 *
1862 * struct LINK3resok {
1863 * post_op_attr file_attributes;
1864 * wcc_data linkdir_wcc;
1865 * };
1866 *
1867 * struct LINK3resfail {
1868 * post_op_attr file_attributes;
1869 * wcc_data linkdir_wcc;
1870 * };
1871 *
1872 * union LINK3res switch (nfsstat3 status) {
1873 * case NFS3_OK:
1874 * LINK3resok resok;
1875 * default:
1876 * LINK3resfail resfail;
1877 * };
1878 */
1879static int nfs3_xdr_dec_link3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1880 struct nfs3_linkres *result)
1881{
1882 enum nfs_stat status;
1883 int error;
1884
1885 error = decode_nfsstat3(xdr, &status);
1886 if (unlikely(error))
1887 goto out;
1888 error = decode_post_op_attr(xdr, result->fattr);
1889 if (unlikely(error))
1890 goto out;
1891 error = decode_wcc_data(xdr, result->dir_attr);
1892 if (unlikely(error))
1893 goto out;
1894 if (status != NFS3_OK)
1895 goto out_status;
1896out:
1897 return error;
1898out_status:
1899 return nfs_stat_to_errno(status);
1900}
1901
1902/**
1903 * nfs3_decode_dirent - Decode a single NFSv3 directory entry stored in
1904 * the local page cache
1905 * @xdr: XDR stream where entry resides
1906 * @entry: buffer to fill in with entry data
1907 * @plus: boolean indicating whether this should be a readdirplus entry
1908 *
1909 * Returns zero if successful, otherwise a negative errno value is
1910 * returned.
1911 *
1912 * This function is not invoked during READDIR reply decoding, but
1913 * rather whenever an application invokes the getdents(2) system call
1914 * on a directory already in our cache.
1915 *
1916 * 3.3.16 entry3
1917 *
1918 * struct entry3 {
1919 * fileid3 fileid;
1920 * filename3 name;
1921 * cookie3 cookie;
1922 * fhandle3 filehandle;
1923 * post_op_attr3 attributes;
1924 * entry3 *nextentry;
1925 * };
1926 *
1927 * 3.3.17 entryplus3
1928 * struct entryplus3 {
1929 * fileid3 fileid;
1930 * filename3 name;
1931 * cookie3 cookie;
1932 * post_op_attr name_attributes;
1933 * post_op_fh3 name_handle;
1934 * entryplus3 *nextentry;
1935 * };
1936 */
1937int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
1938 int plus)
1939{
1940 struct nfs_entry old = *entry;
1941 __be32 *p;
1942 int error;
1943
1944 p = xdr_inline_decode(xdr, 4);
1945 if (unlikely(p == NULL))
1946 goto out_overflow;
1947 if (*p == xdr_zero) {
1948 p = xdr_inline_decode(xdr, 4);
1949 if (unlikely(p == NULL))
1950 goto out_overflow;
1951 if (*p == xdr_zero)
1952 return -EAGAIN;
1953 entry->eof = 1;
1954 return -EBADCOOKIE;
1955 }
1956
1957 error = decode_fileid3(xdr, &entry->ino);
1958 if (unlikely(error))
1959 return error;
1960
1961 error = decode_inline_filename3(xdr, &entry->name, &entry->len);
1962 if (unlikely(error))
1963 return error;
1964
1965 entry->prev_cookie = entry->cookie;
1966 error = decode_cookie3(xdr, &entry->cookie);
1967 if (unlikely(error))
1968 return error;
1969
1970 entry->d_type = DT_UNKNOWN;
1971
1972 if (plus) {
1973 entry->fattr->valid = 0;
1974 error = decode_post_op_attr(xdr, entry->fattr);
1975 if (unlikely(error))
1976 return error;
1977 if (entry->fattr->valid & NFS_ATTR_FATTR_V3)
1978 entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);
1979
1980 /* In fact, a post_op_fh3: */
1981 p = xdr_inline_decode(xdr, 4);
1982 if (unlikely(p == NULL))
1983 goto out_overflow;
1984 if (*p != xdr_zero) {
1985 error = decode_nfs_fh3(xdr, entry->fh);
1986 if (unlikely(error)) {
1987 if (error == -E2BIG)
1988 goto out_truncated;
1989 return error;
1990 }
1991 } else
1992 zero_nfs_fh3(entry->fh);
1993 }
1994
1995 return 0;
1996
1997out_overflow:
1998 print_overflow_msg(__func__, xdr);
1999 return -EAGAIN;
2000out_truncated:
2001 dprintk("NFS: directory entry contains invalid file handle\n");
2002 *entry = old;
2003 return -EAGAIN;
2004}
2005
2006/*
2007 * 3.3.16 READDIR3res
2008 *
2009 * struct dirlist3 {
2010 * entry3 *entries;
2011 * bool eof;
2012 * };
2013 *
2014 * struct READDIR3resok {
2015 * post_op_attr dir_attributes;
2016 * cookieverf3 cookieverf;
2017 * dirlist3 reply;
2018 * };
2019 *
2020 * struct READDIR3resfail {
2021 * post_op_attr dir_attributes;
2022 * };
2023 *
2024 * union READDIR3res switch (nfsstat3 status) {
2025 * case NFS3_OK:
2026 * READDIR3resok resok;
2027 * default:
2028 * READDIR3resfail resfail;
2029 * };
2030 *
2031 * Read the directory contents into the page cache, but otherwise
2032 * don't touch them. The actual decoding is done by nfs3_decode_entry()
2033 * during subsequent nfs_readdir() calls.
2034 */
2035static int decode_dirlist3(struct xdr_stream *xdr)
2036{
2037 u32 recvd, pglen;
2038 size_t hdrlen;
2039
2040 pglen = xdr->buf->page_len;
2041 hdrlen = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base;
2042 recvd = xdr->buf->len - hdrlen;
2043 if (unlikely(pglen > recvd))
2044 goto out_cheating;
2045out:
2046 xdr_read_pages(xdr, pglen);
2047 return pglen;
2048out_cheating:
2049 dprintk("NFS: server cheating in readdir result: "
2050 "pglen %u > recvd %u\n", pglen, recvd);
2051 pglen = recvd;
2052 goto out;
2053}
2054
2055static int decode_readdir3resok(struct xdr_stream *xdr,
2056 struct nfs3_readdirres *result)
2057{
2058 int error;
2059
2060 error = decode_post_op_attr(xdr, result->dir_attr);
2061 if (unlikely(error))
2062 goto out;
2063 /* XXX: do we need to check if result->verf != NULL ? */
2064 error = decode_cookieverf3(xdr, result->verf);
2065 if (unlikely(error))
2066 goto out;
2067 error = decode_dirlist3(xdr);
2068out:
2069 return error;
2070}
2071
2072static int nfs3_xdr_dec_readdir3res(struct rpc_rqst *req,
2073 struct xdr_stream *xdr,
2074 struct nfs3_readdirres *result)
2075{
2076 enum nfs_stat status;
2077 int error;
2078
2079 error = decode_nfsstat3(xdr, &status);
2080 if (unlikely(error))
2081 goto out;
2082 if (status != NFS3_OK)
2083 goto out_default;
2084 error = decode_readdir3resok(xdr, result);
2085out:
2086 return error;
2087out_default:
2088 error = decode_post_op_attr(xdr, result->dir_attr);
2089 if (unlikely(error))
2090 goto out;
2091 return nfs_stat_to_errno(status);
2092}
2093
2094/*
2095 * 3.3.18 FSSTAT3res
2096 *
2097 * struct FSSTAT3resok {
2098 * post_op_attr obj_attributes;
2099 * size3 tbytes;
2100 * size3 fbytes;
2101 * size3 abytes;
2102 * size3 tfiles;
2103 * size3 ffiles;
2104 * size3 afiles;
2105 * uint32 invarsec;
2106 * };
2107 *
2108 * struct FSSTAT3resfail {
2109 * post_op_attr obj_attributes;
2110 * };
2111 *
2112 * union FSSTAT3res switch (nfsstat3 status) {
2113 * case NFS3_OK:
2114 * FSSTAT3resok resok;
2115 * default:
2116 * FSSTAT3resfail resfail;
2117 * };
2118 */
2119static int decode_fsstat3resok(struct xdr_stream *xdr,
2120 struct nfs_fsstat *result)
2121{
2122 __be32 *p;
2123
2124 p = xdr_inline_decode(xdr, 8 * 6 + 4);
2125 if (unlikely(p == NULL))
2126 goto out_overflow;
2127 p = xdr_decode_size3(p, &result->tbytes);
2128 p = xdr_decode_size3(p, &result->fbytes);
2129 p = xdr_decode_size3(p, &result->abytes);
2130 p = xdr_decode_size3(p, &result->tfiles);
2131 p = xdr_decode_size3(p, &result->ffiles);
2132 xdr_decode_size3(p, &result->afiles);
2133 /* ignore invarsec */
2134 return 0;
2135out_overflow:
2136 print_overflow_msg(__func__, xdr);
2137 return -EIO;
2138}
2139
2140static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req,
2141 struct xdr_stream *xdr,
2142 struct nfs_fsstat *result)
2143{
2144 enum nfs_stat status;
2145 int error;
2146
2147 error = decode_nfsstat3(xdr, &status);
2148 if (unlikely(error))
2149 goto out;
2150 error = decode_post_op_attr(xdr, result->fattr);
2151 if (unlikely(error))
2152 goto out;
2153 if (status != NFS3_OK)
2154 goto out_status;
2155 error = decode_fsstat3resok(xdr, result);
2156out:
2157 return error;
2158out_status:
2159 return nfs_stat_to_errno(status);
2160}
2161
2162/*
2163 * 3.3.19 FSINFO3res
2164 *
2165 * struct FSINFO3resok {
2166 * post_op_attr obj_attributes;
2167 * uint32 rtmax;
2168 * uint32 rtpref;
2169 * uint32 rtmult;
2170 * uint32 wtmax;
2171 * uint32 wtpref;
2172 * uint32 wtmult;
2173 * uint32 dtpref;
2174 * size3 maxfilesize;
2175 * nfstime3 time_delta;
2176 * uint32 properties;
2177 * };
2178 *
2179 * struct FSINFO3resfail {
2180 * post_op_attr obj_attributes;
2181 * };
2182 *
2183 * union FSINFO3res switch (nfsstat3 status) {
2184 * case NFS3_OK:
2185 * FSINFO3resok resok;
2186 * default:
2187 * FSINFO3resfail resfail;
2188 * };
2189 */
2190static int decode_fsinfo3resok(struct xdr_stream *xdr,
2191 struct nfs_fsinfo *result)
2192{
2193 __be32 *p;
2194
2195 p = xdr_inline_decode(xdr, 4 * 7 + 8 + 8 + 4);
2196 if (unlikely(p == NULL))
2197 goto out_overflow;
2198 result->rtmax = be32_to_cpup(p++);
2199 result->rtpref = be32_to_cpup(p++);
2200 result->rtmult = be32_to_cpup(p++);
2201 result->wtmax = be32_to_cpup(p++);
2202 result->wtpref = be32_to_cpup(p++);
2203 result->wtmult = be32_to_cpup(p++);
2204 result->dtpref = be32_to_cpup(p++);
2205 p = xdr_decode_size3(p, &result->maxfilesize);
2206 xdr_decode_nfstime3(p, &result->time_delta);
2207
2208 /* ignore properties */
2209 result->lease_time = 0;
2210 return 0;
2211out_overflow:
2212 print_overflow_msg(__func__, xdr);
2213 return -EIO;
2214}
2215
2216static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req,
2217 struct xdr_stream *xdr,
2218 struct nfs_fsinfo *result)
2219{
2220 enum nfs_stat status;
2221 int error;
2222
2223 error = decode_nfsstat3(xdr, &status);
2224 if (unlikely(error))
2225 goto out;
2226 error = decode_post_op_attr(xdr, result->fattr);
2227 if (unlikely(error))
2228 goto out;
2229 if (status != NFS3_OK)
2230 goto out_status;
2231 error = decode_fsinfo3resok(xdr, result);
2232out:
2233 return error;
2234out_status:
2235 return nfs_stat_to_errno(status);
2236}
2237
2238/*
2239 * 3.3.20 PATHCONF3res
2240 *
2241 * struct PATHCONF3resok {
2242 * post_op_attr obj_attributes;
2243 * uint32 linkmax;
2244 * uint32 name_max;
2245 * bool no_trunc;
2246 * bool chown_restricted;
2247 * bool case_insensitive;
2248 * bool case_preserving;
2249 * };
2250 *
2251 * struct PATHCONF3resfail {
2252 * post_op_attr obj_attributes;
2253 * };
2254 *
2255 * union PATHCONF3res switch (nfsstat3 status) {
2256 * case NFS3_OK:
2257 * PATHCONF3resok resok;
2258 * default:
2259 * PATHCONF3resfail resfail;
2260 * };
2261 */
2262static int decode_pathconf3resok(struct xdr_stream *xdr,
2263 struct nfs_pathconf *result)
2264{
2265 __be32 *p;
2266
2267 p = xdr_inline_decode(xdr, 4 * 6);
2268 if (unlikely(p == NULL))
2269 goto out_overflow;
2270 result->max_link = be32_to_cpup(p++);
2271 result->max_namelen = be32_to_cpup(p);
2272 /* ignore remaining fields */
2273 return 0;
2274out_overflow:
2275 print_overflow_msg(__func__, xdr);
2276 return -EIO;
2277}
2278
2279static int nfs3_xdr_dec_pathconf3res(struct rpc_rqst *req,
2280 struct xdr_stream *xdr,
2281 struct nfs_pathconf *result)
2282{
2283 enum nfs_stat status;
2284 int error;
2285
2286 error = decode_nfsstat3(xdr, &status);
2287 if (unlikely(error))
2288 goto out;
2289 error = decode_post_op_attr(xdr, result->fattr);
2290 if (unlikely(error))
2291 goto out;
2292 if (status != NFS3_OK)
2293 goto out_status;
2294 error = decode_pathconf3resok(xdr, result);
2295out:
2296 return error;
2297out_status:
2298 return nfs_stat_to_errno(status);
2299}
2300
2301/*
2302 * 3.3.21 COMMIT3res
2303 *
2304 * struct COMMIT3resok {
2305 * wcc_data file_wcc;
2306 * writeverf3 verf;
2307 * };
2308 *
2309 * struct COMMIT3resfail {
2310 * wcc_data file_wcc;
2311 * };
2312 *
2313 * union COMMIT3res switch (nfsstat3 status) {
2314 * case NFS3_OK:
2315 * COMMIT3resok resok;
2316 * default:
2317 * COMMIT3resfail resfail;
2318 * };
2319 */
2320static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req,
2321 struct xdr_stream *xdr,
2322 struct nfs_writeres *result)
2323{
2324 enum nfs_stat status;
2325 int error;
2326
2327 error = decode_nfsstat3(xdr, &status);
2328 if (unlikely(error))
2329 goto out;
2330 error = decode_wcc_data(xdr, result->fattr);
2331 if (unlikely(error))
2332 goto out;
2333 if (status != NFS3_OK)
2334 goto out_status;
2335 error = decode_writeverf3(xdr, result->verf->verifier);
2336out:
2337 return error;
2338out_status:
2339 return nfs_stat_to_errno(status);
2340}
2341
2342#ifdef CONFIG_NFS_V3_ACL
2343
2344static inline int decode_getacl3resok(struct xdr_stream *xdr,
2345 struct nfs3_getaclres *result)
2346{
2347 struct posix_acl **acl;
2348 unsigned int *aclcnt;
2349 size_t hdrlen;
2350 int error;
2351
2352 error = decode_post_op_attr(xdr, result->fattr);
2353 if (unlikely(error))
2354 goto out;
2355 error = decode_uint32(xdr, &result->mask);
2356 if (unlikely(error))
2357 goto out;
2358 error = -EINVAL;
2359 if (result->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
2360 goto out;
2361
2362 hdrlen = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base;
2363
2364 acl = NULL;
2365 if (result->mask & NFS_ACL)
2366 acl = &result->acl_access;
2367 aclcnt = NULL;
2368 if (result->mask & NFS_ACLCNT)
2369 aclcnt = &result->acl_access_count;
2370 error = nfsacl_decode(xdr->buf, hdrlen, aclcnt, acl);
2371 if (unlikely(error <= 0))
2372 goto out;
2373
2374 acl = NULL;
2375 if (result->mask & NFS_DFACL)
2376 acl = &result->acl_default;
2377 aclcnt = NULL;
2378 if (result->mask & NFS_DFACLCNT)
2379 aclcnt = &result->acl_default_count;
2380 error = nfsacl_decode(xdr->buf, hdrlen + error, aclcnt, acl);
2381 if (unlikely(error <= 0))
2382 return error;
2383 error = 0;
2384out:
2385 return error;
2386}
2387
2388static int nfs3_xdr_dec_getacl3res(struct rpc_rqst *req,
2389 struct xdr_stream *xdr,
2390 struct nfs3_getaclres *result)
2391{
2392 enum nfs_stat status;
2393 int error;
2394
2395 error = decode_nfsstat3(xdr, &status);
2396 if (unlikely(error))
2397 goto out;
2398 if (status != NFS3_OK)
2399 goto out_default;
2400 error = decode_getacl3resok(xdr, result);
2401out:
2402 return error;
2403out_default:
2404 return nfs_stat_to_errno(status);
2405}
2406
2407static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req,
2408 struct xdr_stream *xdr,
2409 struct nfs_fattr *result)
2410{
2411 enum nfs_stat status;
2412 int error;
2413
2414 error = decode_nfsstat3(xdr, &status);
2415 if (unlikely(error))
2416 goto out;
2417 if (status != NFS3_OK)
2418 goto out_default;
2419 error = decode_post_op_attr(xdr, result);
2420out:
2421 return error;
2422out_default:
2423 return nfs_stat_to_errno(status);
2424}
2425
2426#endif /* CONFIG_NFS_V3_ACL */
2427
2428#define PROC(proc, argtype, restype, timer) \
2429[NFS3PROC_##proc] = { \
2430 .p_proc = NFS3PROC_##proc, \
2431 .p_encode = (kxdreproc_t)nfs3_xdr_enc_##argtype##3args, \
2432 .p_decode = (kxdrdproc_t)nfs3_xdr_dec_##restype##3res, \
2433 .p_arglen = NFS3_##argtype##args_sz, \
2434 .p_replen = NFS3_##restype##res_sz, \
2435 .p_timer = timer, \
2436 .p_statidx = NFS3PROC_##proc, \
2437 .p_name = #proc, \
2438 }
2439
2440struct rpc_procinfo nfs3_procedures[] = {
2441 PROC(GETATTR, getattr, getattr, 1),
2442 PROC(SETATTR, setattr, setattr, 0),
2443 PROC(LOOKUP, lookup, lookup, 2),
2444 PROC(ACCESS, access, access, 1),
2445 PROC(READLINK, readlink, readlink, 3),
2446 PROC(READ, read, read, 3),
2447 PROC(WRITE, write, write, 4),
2448 PROC(CREATE, create, create, 0),
2449 PROC(MKDIR, mkdir, create, 0),
2450 PROC(SYMLINK, symlink, create, 0),
2451 PROC(MKNOD, mknod, create, 0),
2452 PROC(REMOVE, remove, remove, 0),
2453 PROC(RMDIR, lookup, setattr, 0),
2454 PROC(RENAME, rename, rename, 0),
2455 PROC(LINK, link, link, 0),
2456 PROC(READDIR, readdir, readdir, 3),
2457 PROC(READDIRPLUS, readdirplus, readdir, 3),
2458 PROC(FSSTAT, getattr, fsstat, 0),
2459 PROC(FSINFO, getattr, fsinfo, 0),
2460 PROC(PATHCONF, getattr, pathconf, 0),
2461 PROC(COMMIT, commit, commit, 5),
2462};
2463
2464struct rpc_version nfs_version3 = {
2465 .number = 3,
2466 .nrprocs = ARRAY_SIZE(nfs3_procedures),
2467 .procs = nfs3_procedures
2468};
2469
2470#ifdef CONFIG_NFS_V3_ACL
2471static struct rpc_procinfo nfs3_acl_procedures[] = {
2472 [ACLPROC3_GETACL] = {
2473 .p_proc = ACLPROC3_GETACL,
2474 .p_encode = (kxdreproc_t)nfs3_xdr_enc_getacl3args,
2475 .p_decode = (kxdrdproc_t)nfs3_xdr_dec_getacl3res,
2476 .p_arglen = ACL3_getaclargs_sz,
2477 .p_replen = ACL3_getaclres_sz,
2478 .p_timer = 1,
2479 .p_name = "GETACL",
2480 },
2481 [ACLPROC3_SETACL] = {
2482 .p_proc = ACLPROC3_SETACL,
2483 .p_encode = (kxdreproc_t)nfs3_xdr_enc_setacl3args,
2484 .p_decode = (kxdrdproc_t)nfs3_xdr_dec_setacl3res,
2485 .p_arglen = ACL3_setaclargs_sz,
2486 .p_replen = ACL3_setaclres_sz,
2487 .p_timer = 0,
2488 .p_name = "SETACL",
2489 },
2490};
2491
2492struct rpc_version nfsacl_version3 = {
2493 .number = 3,
2494 .nrprocs = sizeof(nfs3_acl_procedures)/
2495 sizeof(nfs3_acl_procedures[0]),
2496 .procs = nfs3_acl_procedures,
2497};
2498#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 "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 */