?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Linux 3.6.10
[linux/fpc-iii.git] / fs / nfs / nfs3xdr.c
blob6cbe89400dfcc134b9af58d6ad16ecf42bab911a
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 static int nfs3_stat_to_errno(enum nfs_stat);
90
91 /*
92 * Map file type to S_IFMT bits
93 */
94 static const umode_t nfs_type2fmt[] = {
95 [NF3BAD] = 0,
96 [NF3REG] = S_IFREG,
97 [NF3DIR] = S_IFDIR,
98 [NF3BLK] = S_IFBLK,
99 [NF3CHR] = S_IFCHR,
100 [NF3LNK] = S_IFLNK,
101 [NF3SOCK] = S_IFSOCK,
102 [NF3FIFO] = S_IFIFO,
103 };
104
105 /*
106 * While encoding arguments, set up the reply buffer in advance to
107 * receive reply data directly into the page cache.
108 */
109 static void prepare_reply_buffer(struct rpc_rqst *req, struct page **pages,
110 unsigned int base, unsigned int len,
111 unsigned int bufsize)
112 {
113 struct rpc_auth *auth = req->rq_cred->cr_auth;
114 unsigned int replen;
115
116 replen = RPC_REPHDRSIZE + auth->au_rslack + bufsize;
117 xdr_inline_pages(&req->rq_rcv_buf, replen << 2, pages, base, len);
118 }
119
120 /*
121 * Handle decode buffer overflows out-of-line.
122 */
123 static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
124 {
125 dprintk("NFS: %s prematurely hit the end of our receive buffer. "
126 "Remaining buffer length is %tu words.\n",
127 func, xdr->end - xdr->p);
128 }
129
130
131 /*
132 * Encode/decode NFSv3 basic data types
133 *
134 * Basic NFSv3 data types are defined in section 2.5 of RFC 1813:
135 * "NFS Version 3 Protocol Specification".
136 *
137 * Not all basic data types have their own encoding and decoding
138 * functions. For run-time efficiency, some data types are encoded
139 * or decoded inline.
140 */
141
142 static void encode_uint32(struct xdr_stream *xdr, u32 value)
143 {
144 __be32 *p = xdr_reserve_space(xdr, 4);
145 *p = cpu_to_be32(value);
146 }
147
148 static int decode_uint32(struct xdr_stream *xdr, u32 *value)
149 {
150 __be32 *p;
151
152 p = xdr_inline_decode(xdr, 4);
153 if (unlikely(p == NULL))
154 goto out_overflow;
155 *value = be32_to_cpup(p);
156 return 0;
157 out_overflow:
158 print_overflow_msg(__func__, xdr);
159 return -EIO;
160 }
161
162 static int decode_uint64(struct xdr_stream *xdr, u64 *value)
163 {
164 __be32 *p;
165
166 p = xdr_inline_decode(xdr, 8);
167 if (unlikely(p == NULL))
168 goto out_overflow;
169 xdr_decode_hyper(p, value);
170 return 0;
171 out_overflow:
172 print_overflow_msg(__func__, xdr);
173 return -EIO;
174 }
175
176 /*
177 * fileid3
178 *
179 * typedef uint64 fileid3;
180 */
181 static __be32 *xdr_decode_fileid3(__be32 *p, u64 *fileid)
182 {
183 return xdr_decode_hyper(p, fileid);
184 }
185
186 static int decode_fileid3(struct xdr_stream *xdr, u64 *fileid)
187 {
188 return decode_uint64(xdr, fileid);
189 }
190
191 /*
192 * filename3
193 *
194 * typedef string filename3<>;
195 */
196 static void encode_filename3(struct xdr_stream *xdr,
197 const char *name, u32 length)
198 {
199 __be32 *p;
200
201 BUG_ON(length > NFS3_MAXNAMLEN);
202 p = xdr_reserve_space(xdr, 4 + length);
203 xdr_encode_opaque(p, name, length);
204 }
205
206 static int decode_inline_filename3(struct xdr_stream *xdr,
207 const char **name, u32 *length)
208 {
209 __be32 *p;
210 u32 count;
211
212 p = xdr_inline_decode(xdr, 4);
213 if (unlikely(p == NULL))
214 goto out_overflow;
215 count = be32_to_cpup(p);
216 if (count > NFS3_MAXNAMLEN)
217 goto out_nametoolong;
218 p = xdr_inline_decode(xdr, count);
219 if (unlikely(p == NULL))
220 goto out_overflow;
221 *name = (const char *)p;
222 *length = count;
223 return 0;
224
225 out_nametoolong:
226 dprintk("NFS: returned filename too long: %u\n", count);
227 return -ENAMETOOLONG;
228 out_overflow:
229 print_overflow_msg(__func__, xdr);
230 return -EIO;
231 }
232
233 /*
234 * nfspath3
235 *
236 * typedef string nfspath3<>;
237 */
238 static void encode_nfspath3(struct xdr_stream *xdr, struct page **pages,
239 const u32 length)
240 {
241 BUG_ON(length > NFS3_MAXPATHLEN);
242 encode_uint32(xdr, length);
243 xdr_write_pages(xdr, pages, 0, length);
244 }
245
246 static int decode_nfspath3(struct xdr_stream *xdr)
247 {
248 u32 recvd, count;
249 __be32 *p;
250
251 p = xdr_inline_decode(xdr, 4);
252 if (unlikely(p == NULL))
253 goto out_overflow;
254 count = be32_to_cpup(p);
255 if (unlikely(count >= xdr->buf->page_len || count > NFS3_MAXPATHLEN))
256 goto out_nametoolong;
257 recvd = xdr_read_pages(xdr, count);
258 if (unlikely(count > recvd))
259 goto out_cheating;
260 xdr_terminate_string(xdr->buf, count);
261 return 0;
262
263 out_nametoolong:
264 dprintk("NFS: returned pathname too long: %u\n", count);
265 return -ENAMETOOLONG;
266 out_cheating:
267 dprintk("NFS: server cheating in pathname result: "
268 "count %u > recvd %u\n", count, recvd);
269 return -EIO;
270 out_overflow:
271 print_overflow_msg(__func__, xdr);
272 return -EIO;
273 }
274
275 /*
276 * cookie3
277 *
278 * typedef uint64 cookie3
279 */
280 static __be32 *xdr_encode_cookie3(__be32 *p, u64 cookie)
281 {
282 return xdr_encode_hyper(p, cookie);
283 }
284
285 static int decode_cookie3(struct xdr_stream *xdr, u64 *cookie)
286 {
287 return decode_uint64(xdr, cookie);
288 }
289
290 /*
291 * cookieverf3
292 *
293 * typedef opaque cookieverf3[NFS3_COOKIEVERFSIZE];
294 */
295 static __be32 *xdr_encode_cookieverf3(__be32 *p, const __be32 *verifier)
296 {
297 memcpy(p, verifier, NFS3_COOKIEVERFSIZE);
298 return p + XDR_QUADLEN(NFS3_COOKIEVERFSIZE);
299 }
300
301 static int decode_cookieverf3(struct xdr_stream *xdr, __be32 *verifier)
302 {
303 __be32 *p;
304
305 p = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE);
306 if (unlikely(p == NULL))
307 goto out_overflow;
308 memcpy(verifier, p, NFS3_COOKIEVERFSIZE);
309 return 0;
310 out_overflow:
311 print_overflow_msg(__func__, xdr);
312 return -EIO;
313 }
314
315 /*
316 * createverf3
317 *
318 * typedef opaque createverf3[NFS3_CREATEVERFSIZE];
319 */
320 static void encode_createverf3(struct xdr_stream *xdr, const __be32 *verifier)
321 {
322 __be32 *p;
323
324 p = xdr_reserve_space(xdr, NFS3_CREATEVERFSIZE);
325 memcpy(p, verifier, NFS3_CREATEVERFSIZE);
326 }
327
328 static int decode_writeverf3(struct xdr_stream *xdr, struct nfs_write_verifier *verifier)
329 {
330 __be32 *p;
331
332 p = xdr_inline_decode(xdr, NFS3_WRITEVERFSIZE);
333 if (unlikely(p == NULL))
334 goto out_overflow;
335 memcpy(verifier->data, p, NFS3_WRITEVERFSIZE);
336 return 0;
337 out_overflow:
338 print_overflow_msg(__func__, xdr);
339 return -EIO;
340 }
341
342 /*
343 * size3
344 *
345 * typedef uint64 size3;
346 */
347 static __be32 *xdr_decode_size3(__be32 *p, u64 *size)
348 {
349 return xdr_decode_hyper(p, size);
350 }
351
352 /*
353 * nfsstat3
354 *
355 * enum nfsstat3 {
356 * NFS3_OK = 0,
357 * ...
358 * }
359 */
360 #define NFS3_OK NFS_OK
361
362 static int decode_nfsstat3(struct xdr_stream *xdr, enum nfs_stat *status)
363 {
364 __be32 *p;
365
366 p = xdr_inline_decode(xdr, 4);
367 if (unlikely(p == NULL))
368 goto out_overflow;
369 *status = be32_to_cpup(p);
370 return 0;
371 out_overflow:
372 print_overflow_msg(__func__, xdr);
373 return -EIO;
374 }
375
376 /*
377 * ftype3
378 *
379 * enum ftype3 {
380 * NF3REG = 1,
381 * NF3DIR = 2,
382 * NF3BLK = 3,
383 * NF3CHR = 4,
384 * NF3LNK = 5,
385 * NF3SOCK = 6,
386 * NF3FIFO = 7
387 * };
388 */
389 static void encode_ftype3(struct xdr_stream *xdr, const u32 type)
390 {
391 BUG_ON(type > NF3FIFO);
392 encode_uint32(xdr, type);
393 }
394
395 static __be32 *xdr_decode_ftype3(__be32 *p, umode_t *mode)
396 {
397 u32 type;
398
399 type = be32_to_cpup(p++);
400 if (type > NF3FIFO)
401 type = NF3NON;
402 *mode = nfs_type2fmt[type];
403 return p;
404 }
405
406 /*
407 * specdata3
408 *
409 * struct specdata3 {
410 * uint32 specdata1;
411 * uint32 specdata2;
412 * };
413 */
414 static void encode_specdata3(struct xdr_stream *xdr, const dev_t rdev)
415 {
416 __be32 *p;
417
418 p = xdr_reserve_space(xdr, 8);
419 *p++ = cpu_to_be32(MAJOR(rdev));
420 *p = cpu_to_be32(MINOR(rdev));
421 }
422
423 static __be32 *xdr_decode_specdata3(__be32 *p, dev_t *rdev)
424 {
425 unsigned int major, minor;
426
427 major = be32_to_cpup(p++);
428 minor = be32_to_cpup(p++);
429 *rdev = MKDEV(major, minor);
430 if (MAJOR(*rdev) != major || MINOR(*rdev) != minor)
431 *rdev = 0;
432 return p;
433 }
434
435 /*
436 * nfs_fh3
437 *
438 * struct nfs_fh3 {
439 * opaque data<NFS3_FHSIZE>;
440 * };
441 */
442 static void encode_nfs_fh3(struct xdr_stream *xdr, const struct nfs_fh *fh)
443 {
444 __be32 *p;
445
446 BUG_ON(fh->size > NFS3_FHSIZE);
447 p = xdr_reserve_space(xdr, 4 + fh->size);
448 xdr_encode_opaque(p, fh->data, fh->size);
449 }
450
451 static int decode_nfs_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
452 {
453 u32 length;
454 __be32 *p;
455
456 p = xdr_inline_decode(xdr, 4);
457 if (unlikely(p == NULL))
458 goto out_overflow;
459 length = be32_to_cpup(p++);
460 if (unlikely(length > NFS3_FHSIZE))
461 goto out_toobig;
462 p = xdr_inline_decode(xdr, length);
463 if (unlikely(p == NULL))
464 goto out_overflow;
465 fh->size = length;
466 memcpy(fh->data, p, length);
467 return 0;
468 out_toobig:
469 dprintk("NFS: file handle size (%u) too big\n", length);
470 return -E2BIG;
471 out_overflow:
472 print_overflow_msg(__func__, xdr);
473 return -EIO;
474 }
475
476 static void zero_nfs_fh3(struct nfs_fh *fh)
477 {
478 memset(fh, 0, sizeof(*fh));
479 }
480
481 /*
482 * nfstime3
483 *
484 * struct nfstime3 {
485 * uint32 seconds;
486 * uint32 nseconds;
487 * };
488 */
489 static __be32 *xdr_encode_nfstime3(__be32 *p, const struct timespec *timep)
490 {
491 *p++ = cpu_to_be32(timep->tv_sec);
492 *p++ = cpu_to_be32(timep->tv_nsec);
493 return p;
494 }
495
496 static __be32 *xdr_decode_nfstime3(__be32 *p, struct timespec *timep)
497 {
498 timep->tv_sec = be32_to_cpup(p++);
499 timep->tv_nsec = be32_to_cpup(p++);
500 return p;
501 }
502
503 /*
504 * sattr3
505 *
506 * enum time_how {
507 * DONT_CHANGE = 0,
508 * SET_TO_SERVER_TIME = 1,
509 * SET_TO_CLIENT_TIME = 2
510 * };
511 *
512 * union set_mode3 switch (bool set_it) {
513 * case TRUE:
514 * mode3 mode;
515 * default:
516 * void;
517 * };
518 *
519 * union set_uid3 switch (bool set_it) {
520 * case TRUE:
521 * uid3 uid;
522 * default:
523 * void;
524 * };
525 *
526 * union set_gid3 switch (bool set_it) {
527 * case TRUE:
528 * gid3 gid;
529 * default:
530 * void;
531 * };
532 *
533 * union set_size3 switch (bool set_it) {
534 * case TRUE:
535 * size3 size;
536 * default:
537 * void;
538 * };
539 *
540 * union set_atime switch (time_how set_it) {
541 * case SET_TO_CLIENT_TIME:
542 * nfstime3 atime;
543 * default:
544 * void;
545 * };
546 *
547 * union set_mtime switch (time_how set_it) {
548 * case SET_TO_CLIENT_TIME:
549 * nfstime3 mtime;
550 * default:
551 * void;
552 * };
553 *
554 * struct sattr3 {
555 * set_mode3 mode;
556 * set_uid3 uid;
557 * set_gid3 gid;
558 * set_size3 size;
559 * set_atime atime;
560 * set_mtime mtime;
561 * };
562 */
563 static void encode_sattr3(struct xdr_stream *xdr, const struct iattr *attr)
564 {
565 u32 nbytes;
566 __be32 *p;
567
568 /*
569 * In order to make only a single xdr_reserve_space() call,
570 * pre-compute the total number of bytes to be reserved.
571 * Six boolean values, one for each set_foo field, are always
572 * present in the encoded result, so start there.
573 */
574 nbytes = 6 * 4;
575 if (attr->ia_valid & ATTR_MODE)
576 nbytes += 4;
577 if (attr->ia_valid & ATTR_UID)
578 nbytes += 4;
579 if (attr->ia_valid & ATTR_GID)
580 nbytes += 4;
581 if (attr->ia_valid & ATTR_SIZE)
582 nbytes += 8;
583 if (attr->ia_valid & ATTR_ATIME_SET)
584 nbytes += 8;
585 if (attr->ia_valid & ATTR_MTIME_SET)
586 nbytes += 8;
587 p = xdr_reserve_space(xdr, nbytes);
588
589 if (attr->ia_valid & ATTR_MODE) {
590 *p++ = xdr_one;
591 *p++ = cpu_to_be32(attr->ia_mode & S_IALLUGO);
592 } else
593 *p++ = xdr_zero;
594
595 if (attr->ia_valid & ATTR_UID) {
596 *p++ = xdr_one;
597 *p++ = cpu_to_be32(attr->ia_uid);
598 } else
599 *p++ = xdr_zero;
600
601 if (attr->ia_valid & ATTR_GID) {
602 *p++ = xdr_one;
603 *p++ = cpu_to_be32(attr->ia_gid);
604 } else
605 *p++ = xdr_zero;
606
607 if (attr->ia_valid & ATTR_SIZE) {
608 *p++ = xdr_one;
609 p = xdr_encode_hyper(p, (u64)attr->ia_size);
610 } else
611 *p++ = xdr_zero;
612
613 if (attr->ia_valid & ATTR_ATIME_SET) {
614 *p++ = xdr_two;
615 p = xdr_encode_nfstime3(p, &attr->ia_atime);
616 } else if (attr->ia_valid & ATTR_ATIME) {
617 *p++ = xdr_one;
618 } else
619 *p++ = xdr_zero;
620
621 if (attr->ia_valid & ATTR_MTIME_SET) {
622 *p++ = xdr_two;
623 xdr_encode_nfstime3(p, &attr->ia_mtime);
624 } else if (attr->ia_valid & ATTR_MTIME) {
625 *p = xdr_one;
626 } else
627 *p = xdr_zero;
628 }
629
630 /*
631 * fattr3
632 *
633 * struct fattr3 {
634 * ftype3 type;
635 * mode3 mode;
636 * uint32 nlink;
637 * uid3 uid;
638 * gid3 gid;
639 * size3 size;
640 * size3 used;
641 * specdata3 rdev;
642 * uint64 fsid;
643 * fileid3 fileid;
644 * nfstime3 atime;
645 * nfstime3 mtime;
646 * nfstime3 ctime;
647 * };
648 */
649 static int decode_fattr3(struct xdr_stream *xdr, struct nfs_fattr *fattr)
650 {
651 umode_t fmode;
652 __be32 *p;
653
654 p = xdr_inline_decode(xdr, NFS3_fattr_sz << 2);
655 if (unlikely(p == NULL))
656 goto out_overflow;
657
658 p = xdr_decode_ftype3(p, &fmode);
659
660 fattr->mode = (be32_to_cpup(p++) & ~S_IFMT) | fmode;
661 fattr->nlink = be32_to_cpup(p++);
662 fattr->uid = be32_to_cpup(p++);
663 fattr->gid = be32_to_cpup(p++);
664
665 p = xdr_decode_size3(p, &fattr->size);
666 p = xdr_decode_size3(p, &fattr->du.nfs3.used);
667 p = xdr_decode_specdata3(p, &fattr->rdev);
668
669 p = xdr_decode_hyper(p, &fattr->fsid.major);
670 fattr->fsid.minor = 0;
671
672 p = xdr_decode_fileid3(p, &fattr->fileid);
673 p = xdr_decode_nfstime3(p, &fattr->atime);
674 p = xdr_decode_nfstime3(p, &fattr->mtime);
675 xdr_decode_nfstime3(p, &fattr->ctime);
676 fattr->change_attr = nfs_timespec_to_change_attr(&fattr->ctime);
677
678 fattr->valid |= NFS_ATTR_FATTR_V3;
679 return 0;
680 out_overflow:
681 print_overflow_msg(__func__, xdr);
682 return -EIO;
683 }
684
685 /*
686 * post_op_attr
687 *
688 * union post_op_attr switch (bool attributes_follow) {
689 * case TRUE:
690 * fattr3 attributes;
691 * case FALSE:
692 * void;
693 * };
694 */
695 static int decode_post_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
696 {
697 __be32 *p;
698
699 p = xdr_inline_decode(xdr, 4);
700 if (unlikely(p == NULL))
701 goto out_overflow;
702 if (*p != xdr_zero)
703 return decode_fattr3(xdr, fattr);
704 return 0;
705 out_overflow:
706 print_overflow_msg(__func__, xdr);
707 return -EIO;
708 }
709
710 /*
711 * wcc_attr
712 * struct wcc_attr {
713 * size3 size;
714 * nfstime3 mtime;
715 * nfstime3 ctime;
716 * };
717 */
718 static int decode_wcc_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
719 {
720 __be32 *p;
721
722 p = xdr_inline_decode(xdr, NFS3_wcc_attr_sz << 2);
723 if (unlikely(p == NULL))
724 goto out_overflow;
725
726 fattr->valid |= NFS_ATTR_FATTR_PRESIZE
727 | NFS_ATTR_FATTR_PRECHANGE
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 fattr->pre_change_attr = nfs_timespec_to_change_attr(&fattr->pre_ctime);
735
736 return 0;
737 out_overflow:
738 print_overflow_msg(__func__, xdr);
739 return -EIO;
740 }
741
742 /*
743 * pre_op_attr
744 * union pre_op_attr switch (bool attributes_follow) {
745 * case TRUE:
746 * wcc_attr attributes;
747 * case FALSE:
748 * void;
749 * };
750 *
751 * wcc_data
752 *
753 * struct wcc_data {
754 * pre_op_attr before;
755 * post_op_attr after;
756 * };
757 */
758 static int decode_pre_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
759 {
760 __be32 *p;
761
762 p = xdr_inline_decode(xdr, 4);
763 if (unlikely(p == NULL))
764 goto out_overflow;
765 if (*p != xdr_zero)
766 return decode_wcc_attr(xdr, fattr);
767 return 0;
768 out_overflow:
769 print_overflow_msg(__func__, xdr);
770 return -EIO;
771 }
772
773 static int decode_wcc_data(struct xdr_stream *xdr, struct nfs_fattr *fattr)
774 {
775 int error;
776
777 error = decode_pre_op_attr(xdr, fattr);
778 if (unlikely(error))
779 goto out;
780 error = decode_post_op_attr(xdr, fattr);
781 out:
782 return error;
783 }
784
785 /*
786 * post_op_fh3
787 *
788 * union post_op_fh3 switch (bool handle_follows) {
789 * case TRUE:
790 * nfs_fh3 handle;
791 * case FALSE:
792 * void;
793 * };
794 */
795 static int decode_post_op_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
796 {
797 __be32 *p = xdr_inline_decode(xdr, 4);
798 if (unlikely(p == NULL))
799 goto out_overflow;
800 if (*p != xdr_zero)
801 return decode_nfs_fh3(xdr, fh);
802 zero_nfs_fh3(fh);
803 return 0;
804 out_overflow:
805 print_overflow_msg(__func__, xdr);
806 return -EIO;
807 }
808
809 /*
810 * diropargs3
811 *
812 * struct diropargs3 {
813 * nfs_fh3 dir;
814 * filename3 name;
815 * };
816 */
817 static void encode_diropargs3(struct xdr_stream *xdr, const struct nfs_fh *fh,
818 const char *name, u32 length)
819 {
820 encode_nfs_fh3(xdr, fh);
821 encode_filename3(xdr, name, length);
822 }
823
824
825 /*
826 * NFSv3 XDR encode functions
827 *
828 * NFSv3 argument types are defined in section 3.3 of RFC 1813:
829 * "NFS Version 3 Protocol Specification".
830 */
831
832 /*
833 * 3.3.1 GETATTR3args
834 *
835 * struct GETATTR3args {
836 * nfs_fh3 object;
837 * };
838 */
839 static void nfs3_xdr_enc_getattr3args(struct rpc_rqst *req,
840 struct xdr_stream *xdr,
841 const struct nfs_fh *fh)
842 {
843 encode_nfs_fh3(xdr, fh);
844 }
845
846 /*
847 * 3.3.2 SETATTR3args
848 *
849 * union sattrguard3 switch (bool check) {
850 * case TRUE:
851 * nfstime3 obj_ctime;
852 * case FALSE:
853 * void;
854 * };
855 *
856 * struct SETATTR3args {
857 * nfs_fh3 object;
858 * sattr3 new_attributes;
859 * sattrguard3 guard;
860 * };
861 */
862 static void encode_sattrguard3(struct xdr_stream *xdr,
863 const struct nfs3_sattrargs *args)
864 {
865 __be32 *p;
866
867 if (args->guard) {
868 p = xdr_reserve_space(xdr, 4 + 8);
869 *p++ = xdr_one;
870 xdr_encode_nfstime3(p, &args->guardtime);
871 } else {
872 p = xdr_reserve_space(xdr, 4);
873 *p = xdr_zero;
874 }
875 }
876
877 static void nfs3_xdr_enc_setattr3args(struct rpc_rqst *req,
878 struct xdr_stream *xdr,
879 const struct nfs3_sattrargs *args)
880 {
881 encode_nfs_fh3(xdr, args->fh);
882 encode_sattr3(xdr, args->sattr);
883 encode_sattrguard3(xdr, args);
884 }
885
886 /*
887 * 3.3.3 LOOKUP3args
888 *
889 * struct LOOKUP3args {
890 * diropargs3 what;
891 * };
892 */
893 static void nfs3_xdr_enc_lookup3args(struct rpc_rqst *req,
894 struct xdr_stream *xdr,
895 const struct nfs3_diropargs *args)
896 {
897 encode_diropargs3(xdr, args->fh, args->name, args->len);
898 }
899
900 /*
901 * 3.3.4 ACCESS3args
902 *
903 * struct ACCESS3args {
904 * nfs_fh3 object;
905 * uint32 access;
906 * };
907 */
908 static void encode_access3args(struct xdr_stream *xdr,
909 const struct nfs3_accessargs *args)
910 {
911 encode_nfs_fh3(xdr, args->fh);
912 encode_uint32(xdr, args->access);
913 }
914
915 static void nfs3_xdr_enc_access3args(struct rpc_rqst *req,
916 struct xdr_stream *xdr,
917 const struct nfs3_accessargs *args)
918 {
919 encode_access3args(xdr, args);
920 }
921
922 /*
923 * 3.3.5 READLINK3args
924 *
925 * struct READLINK3args {
926 * nfs_fh3 symlink;
927 * };
928 */
929 static void nfs3_xdr_enc_readlink3args(struct rpc_rqst *req,
930 struct xdr_stream *xdr,
931 const struct nfs3_readlinkargs *args)
932 {
933 encode_nfs_fh3(xdr, args->fh);
934 prepare_reply_buffer(req, args->pages, args->pgbase,
935 args->pglen, NFS3_readlinkres_sz);
936 }
937
938 /*
939 * 3.3.6 READ3args
940 *
941 * struct READ3args {
942 * nfs_fh3 file;
943 * offset3 offset;
944 * count3 count;
945 * };
946 */
947 static void encode_read3args(struct xdr_stream *xdr,
948 const struct nfs_readargs *args)
949 {
950 __be32 *p;
951
952 encode_nfs_fh3(xdr, args->fh);
953
954 p = xdr_reserve_space(xdr, 8 + 4);
955 p = xdr_encode_hyper(p, args->offset);
956 *p = cpu_to_be32(args->count);
957 }
958
959 static void nfs3_xdr_enc_read3args(struct rpc_rqst *req,
960 struct xdr_stream *xdr,
961 const struct nfs_readargs *args)
962 {
963 encode_read3args(xdr, args);
964 prepare_reply_buffer(req, args->pages, args->pgbase,
965 args->count, NFS3_readres_sz);
966 req->rq_rcv_buf.flags |= XDRBUF_READ;
967 }
968
969 /*
970 * 3.3.7 WRITE3args
971 *
972 * enum stable_how {
973 * UNSTABLE = 0,
974 * DATA_SYNC = 1,
975 * FILE_SYNC = 2
976 * };
977 *
978 * struct WRITE3args {
979 * nfs_fh3 file;
980 * offset3 offset;
981 * count3 count;
982 * stable_how stable;
983 * opaque data<>;
984 * };
985 */
986 static void encode_write3args(struct xdr_stream *xdr,
987 const struct nfs_writeargs *args)
988 {
989 __be32 *p;
990
991 encode_nfs_fh3(xdr, args->fh);
992
993 p = xdr_reserve_space(xdr, 8 + 4 + 4 + 4);
994 p = xdr_encode_hyper(p, args->offset);
995 *p++ = cpu_to_be32(args->count);
996 *p++ = cpu_to_be32(args->stable);
997 *p = cpu_to_be32(args->count);
998 xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
999 }
1000
1001 static void nfs3_xdr_enc_write3args(struct rpc_rqst *req,
1002 struct xdr_stream *xdr,
1003 const struct nfs_writeargs *args)
1004 {
1005 encode_write3args(xdr, args);
1006 xdr->buf->flags |= XDRBUF_WRITE;
1007 }
1008
1009 /*
1010 * 3.3.8 CREATE3args
1011 *
1012 * enum createmode3 {
1013 * UNCHECKED = 0,
1014 * GUARDED = 1,
1015 * EXCLUSIVE = 2
1016 * };
1017 *
1018 * union createhow3 switch (createmode3 mode) {
1019 * case UNCHECKED:
1020 * case GUARDED:
1021 * sattr3 obj_attributes;
1022 * case EXCLUSIVE:
1023 * createverf3 verf;
1024 * };
1025 *
1026 * struct CREATE3args {
1027 * diropargs3 where;
1028 * createhow3 how;
1029 * };
1030 */
1031 static void encode_createhow3(struct xdr_stream *xdr,
1032 const struct nfs3_createargs *args)
1033 {
1034 encode_uint32(xdr, args->createmode);
1035 switch (args->createmode) {
1036 case NFS3_CREATE_UNCHECKED:
1037 case NFS3_CREATE_GUARDED:
1038 encode_sattr3(xdr, args->sattr);
1039 break;
1040 case NFS3_CREATE_EXCLUSIVE:
1041 encode_createverf3(xdr, args->verifier);
1042 break;
1043 default:
1044 BUG();
1045 }
1046 }
1047
1048 static void nfs3_xdr_enc_create3args(struct rpc_rqst *req,
1049 struct xdr_stream *xdr,
1050 const struct nfs3_createargs *args)
1051 {
1052 encode_diropargs3(xdr, args->fh, args->name, args->len);
1053 encode_createhow3(xdr, args);
1054 }
1055
1056 /*
1057 * 3.3.9 MKDIR3args
1058 *
1059 * struct MKDIR3args {
1060 * diropargs3 where;
1061 * sattr3 attributes;
1062 * };
1063 */
1064 static void nfs3_xdr_enc_mkdir3args(struct rpc_rqst *req,
1065 struct xdr_stream *xdr,
1066 const struct nfs3_mkdirargs *args)
1067 {
1068 encode_diropargs3(xdr, args->fh, args->name, args->len);
1069 encode_sattr3(xdr, args->sattr);
1070 }
1071
1072 /*
1073 * 3.3.10 SYMLINK3args
1074 *
1075 * struct symlinkdata3 {
1076 * sattr3 symlink_attributes;
1077 * nfspath3 symlink_data;
1078 * };
1079 *
1080 * struct SYMLINK3args {
1081 * diropargs3 where;
1082 * symlinkdata3 symlink;
1083 * };
1084 */
1085 static void encode_symlinkdata3(struct xdr_stream *xdr,
1086 const struct nfs3_symlinkargs *args)
1087 {
1088 encode_sattr3(xdr, args->sattr);
1089 encode_nfspath3(xdr, args->pages, args->pathlen);
1090 }
1091
1092 static void nfs3_xdr_enc_symlink3args(struct rpc_rqst *req,
1093 struct xdr_stream *xdr,
1094 const struct nfs3_symlinkargs *args)
1095 {
1096 encode_diropargs3(xdr, args->fromfh, args->fromname, args->fromlen);
1097 encode_symlinkdata3(xdr, args);
1098 }
1099
1100 /*
1101 * 3.3.11 MKNOD3args
1102 *
1103 * struct devicedata3 {
1104 * sattr3 dev_attributes;
1105 * specdata3 spec;
1106 * };
1107 *
1108 * union mknoddata3 switch (ftype3 type) {
1109 * case NF3CHR:
1110 * case NF3BLK:
1111 * devicedata3 device;
1112 * case NF3SOCK:
1113 * case NF3FIFO:
1114 * sattr3 pipe_attributes;
1115 * default:
1116 * void;
1117 * };
1118 *
1119 * struct MKNOD3args {
1120 * diropargs3 where;
1121 * mknoddata3 what;
1122 * };
1123 */
1124 static void encode_devicedata3(struct xdr_stream *xdr,
1125 const struct nfs3_mknodargs *args)
1126 {
1127 encode_sattr3(xdr, args->sattr);
1128 encode_specdata3(xdr, args->rdev);
1129 }
1130
1131 static void encode_mknoddata3(struct xdr_stream *xdr,
1132 const struct nfs3_mknodargs *args)
1133 {
1134 encode_ftype3(xdr, args->type);
1135 switch (args->type) {
1136 case NF3CHR:
1137 case NF3BLK:
1138 encode_devicedata3(xdr, args);
1139 break;
1140 case NF3SOCK:
1141 case NF3FIFO:
1142 encode_sattr3(xdr, args->sattr);
1143 break;
1144 case NF3REG:
1145 case NF3DIR:
1146 break;
1147 default:
1148 BUG();
1149 }
1150 }
1151
1152 static void nfs3_xdr_enc_mknod3args(struct rpc_rqst *req,
1153 struct xdr_stream *xdr,
1154 const struct nfs3_mknodargs *args)
1155 {
1156 encode_diropargs3(xdr, args->fh, args->name, args->len);
1157 encode_mknoddata3(xdr, args);
1158 }
1159
1160 /*
1161 * 3.3.12 REMOVE3args
1162 *
1163 * struct REMOVE3args {
1164 * diropargs3 object;
1165 * };
1166 */
1167 static void nfs3_xdr_enc_remove3args(struct rpc_rqst *req,
1168 struct xdr_stream *xdr,
1169 const struct nfs_removeargs *args)
1170 {
1171 encode_diropargs3(xdr, args->fh, args->name.name, args->name.len);
1172 }
1173
1174 /*
1175 * 3.3.14 RENAME3args
1176 *
1177 * struct RENAME3args {
1178 * diropargs3 from;
1179 * diropargs3 to;
1180 * };
1181 */
1182 static void nfs3_xdr_enc_rename3args(struct rpc_rqst *req,
1183 struct xdr_stream *xdr,
1184 const struct nfs_renameargs *args)
1185 {
1186 const struct qstr *old = args->old_name;
1187 const struct qstr *new = args->new_name;
1188
1189 encode_diropargs3(xdr, args->old_dir, old->name, old->len);
1190 encode_diropargs3(xdr, args->new_dir, new->name, new->len);
1191 }
1192
1193 /*
1194 * 3.3.15 LINK3args
1195 *
1196 * struct LINK3args {
1197 * nfs_fh3 file;
1198 * diropargs3 link;
1199 * };
1200 */
1201 static void nfs3_xdr_enc_link3args(struct rpc_rqst *req,
1202 struct xdr_stream *xdr,
1203 const struct nfs3_linkargs *args)
1204 {
1205 encode_nfs_fh3(xdr, args->fromfh);
1206 encode_diropargs3(xdr, args->tofh, args->toname, args->tolen);
1207 }
1208
1209 /*
1210 * 3.3.16 READDIR3args
1211 *
1212 * struct READDIR3args {
1213 * nfs_fh3 dir;
1214 * cookie3 cookie;
1215 * cookieverf3 cookieverf;
1216 * count3 count;
1217 * };
1218 */
1219 static void encode_readdir3args(struct xdr_stream *xdr,
1220 const struct nfs3_readdirargs *args)
1221 {
1222 __be32 *p;
1223
1224 encode_nfs_fh3(xdr, args->fh);
1225
1226 p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4);
1227 p = xdr_encode_cookie3(p, args->cookie);
1228 p = xdr_encode_cookieverf3(p, args->verf);
1229 *p = cpu_to_be32(args->count);
1230 }
1231
1232 static void nfs3_xdr_enc_readdir3args(struct rpc_rqst *req,
1233 struct xdr_stream *xdr,
1234 const struct nfs3_readdirargs *args)
1235 {
1236 encode_readdir3args(xdr, args);
1237 prepare_reply_buffer(req, args->pages, 0,
1238 args->count, NFS3_readdirres_sz);
1239 }
1240
1241 /*
1242 * 3.3.17 READDIRPLUS3args
1243 *
1244 * struct READDIRPLUS3args {
1245 * nfs_fh3 dir;
1246 * cookie3 cookie;
1247 * cookieverf3 cookieverf;
1248 * count3 dircount;
1249 * count3 maxcount;
1250 * };
1251 */
1252 static void encode_readdirplus3args(struct xdr_stream *xdr,
1253 const struct nfs3_readdirargs *args)
1254 {
1255 __be32 *p;
1256
1257 encode_nfs_fh3(xdr, args->fh);
1258
1259 p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4 + 4);
1260 p = xdr_encode_cookie3(p, args->cookie);
1261 p = xdr_encode_cookieverf3(p, args->verf);
1262
1263 /*
1264 * readdirplus: need dircount + buffer size.
1265 * We just make sure we make dircount big enough
1266 */
1267 *p++ = cpu_to_be32(args->count >> 3);
1268
1269 *p = cpu_to_be32(args->count);
1270 }
1271
1272 static void nfs3_xdr_enc_readdirplus3args(struct rpc_rqst *req,
1273 struct xdr_stream *xdr,
1274 const struct nfs3_readdirargs *args)
1275 {
1276 encode_readdirplus3args(xdr, args);
1277 prepare_reply_buffer(req, args->pages, 0,
1278 args->count, NFS3_readdirres_sz);
1279 }
1280
1281 /*
1282 * 3.3.21 COMMIT3args
1283 *
1284 * struct COMMIT3args {
1285 * nfs_fh3 file;
1286 * offset3 offset;
1287 * count3 count;
1288 * };
1289 */
1290 static void encode_commit3args(struct xdr_stream *xdr,
1291 const struct nfs_commitargs *args)
1292 {
1293 __be32 *p;
1294
1295 encode_nfs_fh3(xdr, args->fh);
1296
1297 p = xdr_reserve_space(xdr, 8 + 4);
1298 p = xdr_encode_hyper(p, args->offset);
1299 *p = cpu_to_be32(args->count);
1300 }
1301
1302 static void nfs3_xdr_enc_commit3args(struct rpc_rqst *req,
1303 struct xdr_stream *xdr,
1304 const struct nfs_commitargs *args)
1305 {
1306 encode_commit3args(xdr, args);
1307 }
1308
1309 #ifdef CONFIG_NFS_V3_ACL
1310
1311 static void nfs3_xdr_enc_getacl3args(struct rpc_rqst *req,
1312 struct xdr_stream *xdr,
1313 const struct nfs3_getaclargs *args)
1314 {
1315 encode_nfs_fh3(xdr, args->fh);
1316 encode_uint32(xdr, args->mask);
1317 if (args->mask & (NFS_ACL | NFS_DFACL))
1318 prepare_reply_buffer(req, args->pages, 0,
1319 NFSACL_MAXPAGES << PAGE_SHIFT,
1320 ACL3_getaclres_sz);
1321 }
1322
1323 static void nfs3_xdr_enc_setacl3args(struct rpc_rqst *req,
1324 struct xdr_stream *xdr,
1325 const struct nfs3_setaclargs *args)
1326 {
1327 unsigned int base;
1328 int error;
1329
1330 encode_nfs_fh3(xdr, NFS_FH(args->inode));
1331 encode_uint32(xdr, args->mask);
1332
1333 base = req->rq_slen;
1334 if (args->npages != 0)
1335 xdr_write_pages(xdr, args->pages, 0, args->len);
1336 else
1337 xdr_reserve_space(xdr, NFS_ACL_INLINE_BUFSIZE);
1338
1339 error = nfsacl_encode(xdr->buf, base, args->inode,
1340 (args->mask & NFS_ACL) ?
1341 args->acl_access : NULL, 1, 0);
1342 BUG_ON(error < 0);
1343 error = nfsacl_encode(xdr->buf, base + error, args->inode,
1344 (args->mask & NFS_DFACL) ?
1345 args->acl_default : NULL, 1,
1346 NFS_ACL_DEFAULT);
1347 BUG_ON(error < 0);
1348 }
1349
1350 #endif /* CONFIG_NFS_V3_ACL */
1351
1352 /*
1353 * NFSv3 XDR decode functions
1354 *
1355 * NFSv3 result types are defined in section 3.3 of RFC 1813:
1356 * "NFS Version 3 Protocol Specification".
1357 */
1358
1359 /*
1360 * 3.3.1 GETATTR3res
1361 *
1362 * struct GETATTR3resok {
1363 * fattr3 obj_attributes;
1364 * };
1365 *
1366 * union GETATTR3res switch (nfsstat3 status) {
1367 * case NFS3_OK:
1368 * GETATTR3resok resok;
1369 * default:
1370 * void;
1371 * };
1372 */
1373 static int nfs3_xdr_dec_getattr3res(struct rpc_rqst *req,
1374 struct xdr_stream *xdr,
1375 struct nfs_fattr *result)
1376 {
1377 enum nfs_stat status;
1378 int error;
1379
1380 error = decode_nfsstat3(xdr, &status);
1381 if (unlikely(error))
1382 goto out;
1383 if (status != NFS3_OK)
1384 goto out_default;
1385 error = decode_fattr3(xdr, result);
1386 out:
1387 return error;
1388 out_default:
1389 return nfs3_stat_to_errno(status);
1390 }
1391
1392 /*
1393 * 3.3.2 SETATTR3res
1394 *
1395 * struct SETATTR3resok {
1396 * wcc_data obj_wcc;
1397 * };
1398 *
1399 * struct SETATTR3resfail {
1400 * wcc_data obj_wcc;
1401 * };
1402 *
1403 * union SETATTR3res switch (nfsstat3 status) {
1404 * case NFS3_OK:
1405 * SETATTR3resok resok;
1406 * default:
1407 * SETATTR3resfail resfail;
1408 * };
1409 */
1410 static int nfs3_xdr_dec_setattr3res(struct rpc_rqst *req,
1411 struct xdr_stream *xdr,
1412 struct nfs_fattr *result)
1413 {
1414 enum nfs_stat status;
1415 int error;
1416
1417 error = decode_nfsstat3(xdr, &status);
1418 if (unlikely(error))
1419 goto out;
1420 error = decode_wcc_data(xdr, result);
1421 if (unlikely(error))
1422 goto out;
1423 if (status != NFS3_OK)
1424 goto out_status;
1425 out:
1426 return error;
1427 out_status:
1428 return nfs3_stat_to_errno(status);
1429 }
1430
1431 /*
1432 * 3.3.3 LOOKUP3res
1433 *
1434 * struct LOOKUP3resok {
1435 * nfs_fh3 object;
1436 * post_op_attr obj_attributes;
1437 * post_op_attr dir_attributes;
1438 * };
1439 *
1440 * struct LOOKUP3resfail {
1441 * post_op_attr dir_attributes;
1442 * };
1443 *
1444 * union LOOKUP3res switch (nfsstat3 status) {
1445 * case NFS3_OK:
1446 * LOOKUP3resok resok;
1447 * default:
1448 * LOOKUP3resfail resfail;
1449 * };
1450 */
1451 static int nfs3_xdr_dec_lookup3res(struct rpc_rqst *req,
1452 struct xdr_stream *xdr,
1453 struct nfs3_diropres *result)
1454 {
1455 enum nfs_stat status;
1456 int error;
1457
1458 error = decode_nfsstat3(xdr, &status);
1459 if (unlikely(error))
1460 goto out;
1461 if (status != NFS3_OK)
1462 goto out_default;
1463 error = decode_nfs_fh3(xdr, result->fh);
1464 if (unlikely(error))
1465 goto out;
1466 error = decode_post_op_attr(xdr, result->fattr);
1467 if (unlikely(error))
1468 goto out;
1469 error = decode_post_op_attr(xdr, result->dir_attr);
1470 out:
1471 return error;
1472 out_default:
1473 error = decode_post_op_attr(xdr, result->dir_attr);
1474 if (unlikely(error))
1475 goto out;
1476 return nfs3_stat_to_errno(status);
1477 }
1478
1479 /*
1480 * 3.3.4 ACCESS3res
1481 *
1482 * struct ACCESS3resok {
1483 * post_op_attr obj_attributes;
1484 * uint32 access;
1485 * };
1486 *
1487 * struct ACCESS3resfail {
1488 * post_op_attr obj_attributes;
1489 * };
1490 *
1491 * union ACCESS3res switch (nfsstat3 status) {
1492 * case NFS3_OK:
1493 * ACCESS3resok resok;
1494 * default:
1495 * ACCESS3resfail resfail;
1496 * };
1497 */
1498 static int nfs3_xdr_dec_access3res(struct rpc_rqst *req,
1499 struct xdr_stream *xdr,
1500 struct nfs3_accessres *result)
1501 {
1502 enum nfs_stat status;
1503 int error;
1504
1505 error = decode_nfsstat3(xdr, &status);
1506 if (unlikely(error))
1507 goto out;
1508 error = decode_post_op_attr(xdr, result->fattr);
1509 if (unlikely(error))
1510 goto out;
1511 if (status != NFS3_OK)
1512 goto out_default;
1513 error = decode_uint32(xdr, &result->access);
1514 out:
1515 return error;
1516 out_default:
1517 return nfs3_stat_to_errno(status);
1518 }
1519
1520 /*
1521 * 3.3.5 READLINK3res
1522 *
1523 * struct READLINK3resok {
1524 * post_op_attr symlink_attributes;
1525 * nfspath3 data;
1526 * };
1527 *
1528 * struct READLINK3resfail {
1529 * post_op_attr symlink_attributes;
1530 * };
1531 *
1532 * union READLINK3res switch (nfsstat3 status) {
1533 * case NFS3_OK:
1534 * READLINK3resok resok;
1535 * default:
1536 * READLINK3resfail resfail;
1537 * };
1538 */
1539 static int nfs3_xdr_dec_readlink3res(struct rpc_rqst *req,
1540 struct xdr_stream *xdr,
1541 struct nfs_fattr *result)
1542 {
1543 enum nfs_stat status;
1544 int error;
1545
1546 error = decode_nfsstat3(xdr, &status);
1547 if (unlikely(error))
1548 goto out;
1549 error = decode_post_op_attr(xdr, result);
1550 if (unlikely(error))
1551 goto out;
1552 if (status != NFS3_OK)
1553 goto out_default;
1554 error = decode_nfspath3(xdr);
1555 out:
1556 return error;
1557 out_default:
1558 return nfs3_stat_to_errno(status);
1559 }
1560
1561 /*
1562 * 3.3.6 READ3res
1563 *
1564 * struct READ3resok {
1565 * post_op_attr file_attributes;
1566 * count3 count;
1567 * bool eof;
1568 * opaque data<>;
1569 * };
1570 *
1571 * struct READ3resfail {
1572 * post_op_attr file_attributes;
1573 * };
1574 *
1575 * union READ3res switch (nfsstat3 status) {
1576 * case NFS3_OK:
1577 * READ3resok resok;
1578 * default:
1579 * READ3resfail resfail;
1580 * };
1581 */
1582 static int decode_read3resok(struct xdr_stream *xdr,
1583 struct nfs_readres *result)
1584 {
1585 u32 eof, count, ocount, recvd;
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 recvd = xdr_read_pages(xdr, count);
1597 if (unlikely(count > recvd))
1598 goto out_cheating;
1599 out:
1600 result->eof = eof;
1601 result->count = count;
1602 return count;
1603 out_mismatch:
1604 dprintk("NFS: READ count doesn't match length of opaque: "
1605 "count %u != ocount %u\n", count, ocount);
1606 return -EIO;
1607 out_cheating:
1608 dprintk("NFS: server cheating in read result: "
1609 "count %u > recvd %u\n", count, recvd);
1610 count = recvd;
1611 eof = 0;
1612 goto out;
1613 out_overflow:
1614 print_overflow_msg(__func__, xdr);
1615 return -EIO;
1616 }
1617
1618 static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1619 struct nfs_readres *result)
1620 {
1621 enum nfs_stat status;
1622 int error;
1623
1624 error = decode_nfsstat3(xdr, &status);
1625 if (unlikely(error))
1626 goto out;
1627 error = decode_post_op_attr(xdr, result->fattr);
1628 if (unlikely(error))
1629 goto out;
1630 if (status != NFS3_OK)
1631 goto out_status;
1632 error = decode_read3resok(xdr, result);
1633 out:
1634 return error;
1635 out_status:
1636 return nfs3_stat_to_errno(status);
1637 }
1638
1639 /*
1640 * 3.3.7 WRITE3res
1641 *
1642 * enum stable_how {
1643 * UNSTABLE = 0,
1644 * DATA_SYNC = 1,
1645 * FILE_SYNC = 2
1646 * };
1647 *
1648 * struct WRITE3resok {
1649 * wcc_data file_wcc;
1650 * count3 count;
1651 * stable_how committed;
1652 * writeverf3 verf;
1653 * };
1654 *
1655 * struct WRITE3resfail {
1656 * wcc_data file_wcc;
1657 * };
1658 *
1659 * union WRITE3res switch (nfsstat3 status) {
1660 * case NFS3_OK:
1661 * WRITE3resok resok;
1662 * default:
1663 * WRITE3resfail resfail;
1664 * };
1665 */
1666 static int decode_write3resok(struct xdr_stream *xdr,
1667 struct nfs_writeres *result)
1668 {
1669 __be32 *p;
1670
1671 p = xdr_inline_decode(xdr, 4 + 4);
1672 if (unlikely(p == NULL))
1673 goto out_overflow;
1674 result->count = be32_to_cpup(p++);
1675 result->verf->committed = be32_to_cpup(p++);
1676 if (unlikely(result->verf->committed > NFS_FILE_SYNC))
1677 goto out_badvalue;
1678 if (decode_writeverf3(xdr, &result->verf->verifier))
1679 goto out_eio;
1680 return result->count;
1681 out_badvalue:
1682 dprintk("NFS: bad stable_how value: %u\n", result->verf->committed);
1683 return -EIO;
1684 out_overflow:
1685 print_overflow_msg(__func__, xdr);
1686 out_eio:
1687 return -EIO;
1688 }
1689
1690 static int nfs3_xdr_dec_write3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1691 struct nfs_writeres *result)
1692 {
1693 enum nfs_stat status;
1694 int error;
1695
1696 error = decode_nfsstat3(xdr, &status);
1697 if (unlikely(error))
1698 goto out;
1699 error = decode_wcc_data(xdr, result->fattr);
1700 if (unlikely(error))
1701 goto out;
1702 if (status != NFS3_OK)
1703 goto out_status;
1704 error = decode_write3resok(xdr, result);
1705 out:
1706 return error;
1707 out_status:
1708 return nfs3_stat_to_errno(status);
1709 }
1710
1711 /*
1712 * 3.3.8 CREATE3res
1713 *
1714 * struct CREATE3resok {
1715 * post_op_fh3 obj;
1716 * post_op_attr obj_attributes;
1717 * wcc_data dir_wcc;
1718 * };
1719 *
1720 * struct CREATE3resfail {
1721 * wcc_data dir_wcc;
1722 * };
1723 *
1724 * union CREATE3res switch (nfsstat3 status) {
1725 * case NFS3_OK:
1726 * CREATE3resok resok;
1727 * default:
1728 * CREATE3resfail resfail;
1729 * };
1730 */
1731 static int decode_create3resok(struct xdr_stream *xdr,
1732 struct nfs3_diropres *result)
1733 {
1734 int error;
1735
1736 error = decode_post_op_fh3(xdr, result->fh);
1737 if (unlikely(error))
1738 goto out;
1739 error = decode_post_op_attr(xdr, result->fattr);
1740 if (unlikely(error))
1741 goto out;
1742 /* The server isn't required to return a file handle.
1743 * If it didn't, force the client to perform a LOOKUP
1744 * to determine the correct file handle and attribute
1745 * values for the new object. */
1746 if (result->fh->size == 0)
1747 result->fattr->valid = 0;
1748 error = decode_wcc_data(xdr, result->dir_attr);
1749 out:
1750 return error;
1751 }
1752
1753 static int nfs3_xdr_dec_create3res(struct rpc_rqst *req,
1754 struct xdr_stream *xdr,
1755 struct nfs3_diropres *result)
1756 {
1757 enum nfs_stat status;
1758 int error;
1759
1760 error = decode_nfsstat3(xdr, &status);
1761 if (unlikely(error))
1762 goto out;
1763 if (status != NFS3_OK)
1764 goto out_default;
1765 error = decode_create3resok(xdr, result);
1766 out:
1767 return error;
1768 out_default:
1769 error = decode_wcc_data(xdr, result->dir_attr);
1770 if (unlikely(error))
1771 goto out;
1772 return nfs3_stat_to_errno(status);
1773 }
1774
1775 /*
1776 * 3.3.12 REMOVE3res
1777 *
1778 * struct REMOVE3resok {
1779 * wcc_data dir_wcc;
1780 * };
1781 *
1782 * struct REMOVE3resfail {
1783 * wcc_data dir_wcc;
1784 * };
1785 *
1786 * union REMOVE3res switch (nfsstat3 status) {
1787 * case NFS3_OK:
1788 * REMOVE3resok resok;
1789 * default:
1790 * REMOVE3resfail resfail;
1791 * };
1792 */
1793 static int nfs3_xdr_dec_remove3res(struct rpc_rqst *req,
1794 struct xdr_stream *xdr,
1795 struct nfs_removeres *result)
1796 {
1797 enum nfs_stat status;
1798 int error;
1799
1800 error = decode_nfsstat3(xdr, &status);
1801 if (unlikely(error))
1802 goto out;
1803 error = decode_wcc_data(xdr, result->dir_attr);
1804 if (unlikely(error))
1805 goto out;
1806 if (status != NFS3_OK)
1807 goto out_status;
1808 out:
1809 return error;
1810 out_status:
1811 return nfs3_stat_to_errno(status);
1812 }
1813
1814 /*
1815 * 3.3.14 RENAME3res
1816 *
1817 * struct RENAME3resok {
1818 * wcc_data fromdir_wcc;
1819 * wcc_data todir_wcc;
1820 * };
1821 *
1822 * struct RENAME3resfail {
1823 * wcc_data fromdir_wcc;
1824 * wcc_data todir_wcc;
1825 * };
1826 *
1827 * union RENAME3res switch (nfsstat3 status) {
1828 * case NFS3_OK:
1829 * RENAME3resok resok;
1830 * default:
1831 * RENAME3resfail resfail;
1832 * };
1833 */
1834 static int nfs3_xdr_dec_rename3res(struct rpc_rqst *req,
1835 struct xdr_stream *xdr,
1836 struct nfs_renameres *result)
1837 {
1838 enum nfs_stat status;
1839 int error;
1840
1841 error = decode_nfsstat3(xdr, &status);
1842 if (unlikely(error))
1843 goto out;
1844 error = decode_wcc_data(xdr, result->old_fattr);
1845 if (unlikely(error))
1846 goto out;
1847 error = decode_wcc_data(xdr, result->new_fattr);
1848 if (unlikely(error))
1849 goto out;
1850 if (status != NFS3_OK)
1851 goto out_status;
1852 out:
1853 return error;
1854 out_status:
1855 return nfs3_stat_to_errno(status);
1856 }
1857
1858 /*
1859 * 3.3.15 LINK3res
1860 *
1861 * struct LINK3resok {
1862 * post_op_attr file_attributes;
1863 * wcc_data linkdir_wcc;
1864 * };
1865 *
1866 * struct LINK3resfail {
1867 * post_op_attr file_attributes;
1868 * wcc_data linkdir_wcc;
1869 * };
1870 *
1871 * union LINK3res switch (nfsstat3 status) {
1872 * case NFS3_OK:
1873 * LINK3resok resok;
1874 * default:
1875 * LINK3resfail resfail;
1876 * };
1877 */
1878 static int nfs3_xdr_dec_link3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1879 struct nfs3_linkres *result)
1880 {
1881 enum nfs_stat status;
1882 int error;
1883
1884 error = decode_nfsstat3(xdr, &status);
1885 if (unlikely(error))
1886 goto out;
1887 error = decode_post_op_attr(xdr, result->fattr);
1888 if (unlikely(error))
1889 goto out;
1890 error = decode_wcc_data(xdr, result->dir_attr);
1891 if (unlikely(error))
1892 goto out;
1893 if (status != NFS3_OK)
1894 goto out_status;
1895 out:
1896 return error;
1897 out_status:
1898 return nfs3_stat_to_errno(status);
1899 }
1900
1901 /**
1902 * nfs3_decode_dirent - Decode a single NFSv3 directory entry stored in
1903 * the local page cache
1904 * @xdr: XDR stream where entry resides
1905 * @entry: buffer to fill in with entry data
1906 * @plus: boolean indicating whether this should be a readdirplus entry
1907 *
1908 * Returns zero if successful, otherwise a negative errno value is
1909 * returned.
1910 *
1911 * This function is not invoked during READDIR reply decoding, but
1912 * rather whenever an application invokes the getdents(2) system call
1913 * on a directory already in our cache.
1914 *
1915 * 3.3.16 entry3
1916 *
1917 * struct entry3 {
1918 * fileid3 fileid;
1919 * filename3 name;
1920 * cookie3 cookie;
1921 * fhandle3 filehandle;
1922 * post_op_attr3 attributes;
1923 * entry3 *nextentry;
1924 * };
1925 *
1926 * 3.3.17 entryplus3
1927 * struct entryplus3 {
1928 * fileid3 fileid;
1929 * filename3 name;
1930 * cookie3 cookie;
1931 * post_op_attr name_attributes;
1932 * post_op_fh3 name_handle;
1933 * entryplus3 *nextentry;
1934 * };
1935 */
1936 int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
1937 int plus)
1938 {
1939 struct nfs_entry old = *entry;
1940 __be32 *p;
1941 int error;
1942
1943 p = xdr_inline_decode(xdr, 4);
1944 if (unlikely(p == NULL))
1945 goto out_overflow;
1946 if (*p == xdr_zero) {
1947 p = xdr_inline_decode(xdr, 4);
1948 if (unlikely(p == NULL))
1949 goto out_overflow;
1950 if (*p == xdr_zero)
1951 return -EAGAIN;
1952 entry->eof = 1;
1953 return -EBADCOOKIE;
1954 }
1955
1956 error = decode_fileid3(xdr, &entry->ino);
1957 if (unlikely(error))
1958 return error;
1959
1960 error = decode_inline_filename3(xdr, &entry->name, &entry->len);
1961 if (unlikely(error))
1962 return error;
1963
1964 entry->prev_cookie = entry->cookie;
1965 error = decode_cookie3(xdr, &entry->cookie);
1966 if (unlikely(error))
1967 return error;
1968
1969 entry->d_type = DT_UNKNOWN;
1970
1971 if (plus) {
1972 entry->fattr->valid = 0;
1973 error = decode_post_op_attr(xdr, entry->fattr);
1974 if (unlikely(error))
1975 return error;
1976 if (entry->fattr->valid & NFS_ATTR_FATTR_V3)
1977 entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);
1978
1979 /* In fact, a post_op_fh3: */
1980 p = xdr_inline_decode(xdr, 4);
1981 if (unlikely(p == NULL))
1982 goto out_overflow;
1983 if (*p != xdr_zero) {
1984 error = decode_nfs_fh3(xdr, entry->fh);
1985 if (unlikely(error)) {
1986 if (error == -E2BIG)
1987 goto out_truncated;
1988 return error;
1989 }
1990 } else
1991 zero_nfs_fh3(entry->fh);
1992 }
1993
1994 return 0;
1995
1996 out_overflow:
1997 print_overflow_msg(__func__, xdr);
1998 return -EAGAIN;
1999 out_truncated:
2000 dprintk("NFS: directory entry contains invalid file handle\n");
2001 *entry = old;
2002 return -EAGAIN;
2003 }
2004
2005 /*
2006 * 3.3.16 READDIR3res
2007 *
2008 * struct dirlist3 {
2009 * entry3 *entries;
2010 * bool eof;
2011 * };
2012 *
2013 * struct READDIR3resok {
2014 * post_op_attr dir_attributes;
2015 * cookieverf3 cookieverf;
2016 * dirlist3 reply;
2017 * };
2018 *
2019 * struct READDIR3resfail {
2020 * post_op_attr dir_attributes;
2021 * };
2022 *
2023 * union READDIR3res switch (nfsstat3 status) {
2024 * case NFS3_OK:
2025 * READDIR3resok resok;
2026 * default:
2027 * READDIR3resfail resfail;
2028 * };
2029 *
2030 * Read the directory contents into the page cache, but otherwise
2031 * don't touch them. The actual decoding is done by nfs3_decode_entry()
2032 * during subsequent nfs_readdir() calls.
2033 */
2034 static int decode_dirlist3(struct xdr_stream *xdr)
2035 {
2036 return xdr_read_pages(xdr, xdr->buf->page_len);
2037 }
2038
2039 static int decode_readdir3resok(struct xdr_stream *xdr,
2040 struct nfs3_readdirres *result)
2041 {
2042 int error;
2043
2044 error = decode_post_op_attr(xdr, result->dir_attr);
2045 if (unlikely(error))
2046 goto out;
2047 /* XXX: do we need to check if result->verf != NULL ? */
2048 error = decode_cookieverf3(xdr, result->verf);
2049 if (unlikely(error))
2050 goto out;
2051 error = decode_dirlist3(xdr);
2052 out:
2053 return error;
2054 }
2055
2056 static int nfs3_xdr_dec_readdir3res(struct rpc_rqst *req,
2057 struct xdr_stream *xdr,
2058 struct nfs3_readdirres *result)
2059 {
2060 enum nfs_stat status;
2061 int error;
2062
2063 error = decode_nfsstat3(xdr, &status);
2064 if (unlikely(error))
2065 goto out;
2066 if (status != NFS3_OK)
2067 goto out_default;
2068 error = decode_readdir3resok(xdr, result);
2069 out:
2070 return error;
2071 out_default:
2072 error = decode_post_op_attr(xdr, result->dir_attr);
2073 if (unlikely(error))
2074 goto out;
2075 return nfs3_stat_to_errno(status);
2076 }
2077
2078 /*
2079 * 3.3.18 FSSTAT3res
2080 *
2081 * struct FSSTAT3resok {
2082 * post_op_attr obj_attributes;
2083 * size3 tbytes;
2084 * size3 fbytes;
2085 * size3 abytes;
2086 * size3 tfiles;
2087 * size3 ffiles;
2088 * size3 afiles;
2089 * uint32 invarsec;
2090 * };
2091 *
2092 * struct FSSTAT3resfail {
2093 * post_op_attr obj_attributes;
2094 * };
2095 *
2096 * union FSSTAT3res switch (nfsstat3 status) {
2097 * case NFS3_OK:
2098 * FSSTAT3resok resok;
2099 * default:
2100 * FSSTAT3resfail resfail;
2101 * };
2102 */
2103 static int decode_fsstat3resok(struct xdr_stream *xdr,
2104 struct nfs_fsstat *result)
2105 {
2106 __be32 *p;
2107
2108 p = xdr_inline_decode(xdr, 8 * 6 + 4);
2109 if (unlikely(p == NULL))
2110 goto out_overflow;
2111 p = xdr_decode_size3(p, &result->tbytes);
2112 p = xdr_decode_size3(p, &result->fbytes);
2113 p = xdr_decode_size3(p, &result->abytes);
2114 p = xdr_decode_size3(p, &result->tfiles);
2115 p = xdr_decode_size3(p, &result->ffiles);
2116 xdr_decode_size3(p, &result->afiles);
2117 /* ignore invarsec */
2118 return 0;
2119 out_overflow:
2120 print_overflow_msg(__func__, xdr);
2121 return -EIO;
2122 }
2123
2124 static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req,
2125 struct xdr_stream *xdr,
2126 struct nfs_fsstat *result)
2127 {
2128 enum nfs_stat status;
2129 int error;
2130
2131 error = decode_nfsstat3(xdr, &status);
2132 if (unlikely(error))
2133 goto out;
2134 error = decode_post_op_attr(xdr, result->fattr);
2135 if (unlikely(error))
2136 goto out;
2137 if (status != NFS3_OK)
2138 goto out_status;
2139 error = decode_fsstat3resok(xdr, result);
2140 out:
2141 return error;
2142 out_status:
2143 return nfs3_stat_to_errno(status);
2144 }
2145
2146 /*
2147 * 3.3.19 FSINFO3res
2148 *
2149 * struct FSINFO3resok {
2150 * post_op_attr obj_attributes;
2151 * uint32 rtmax;
2152 * uint32 rtpref;
2153 * uint32 rtmult;
2154 * uint32 wtmax;
2155 * uint32 wtpref;
2156 * uint32 wtmult;
2157 * uint32 dtpref;
2158 * size3 maxfilesize;
2159 * nfstime3 time_delta;
2160 * uint32 properties;
2161 * };
2162 *
2163 * struct FSINFO3resfail {
2164 * post_op_attr obj_attributes;
2165 * };
2166 *
2167 * union FSINFO3res switch (nfsstat3 status) {
2168 * case NFS3_OK:
2169 * FSINFO3resok resok;
2170 * default:
2171 * FSINFO3resfail resfail;
2172 * };
2173 */
2174 static int decode_fsinfo3resok(struct xdr_stream *xdr,
2175 struct nfs_fsinfo *result)
2176 {
2177 __be32 *p;
2178
2179 p = xdr_inline_decode(xdr, 4 * 7 + 8 + 8 + 4);
2180 if (unlikely(p == NULL))
2181 goto out_overflow;
2182 result->rtmax = be32_to_cpup(p++);
2183 result->rtpref = be32_to_cpup(p++);
2184 result->rtmult = be32_to_cpup(p++);
2185 result->wtmax = be32_to_cpup(p++);
2186 result->wtpref = be32_to_cpup(p++);
2187 result->wtmult = be32_to_cpup(p++);
2188 result->dtpref = be32_to_cpup(p++);
2189 p = xdr_decode_size3(p, &result->maxfilesize);
2190 xdr_decode_nfstime3(p, &result->time_delta);
2191
2192 /* ignore properties */
2193 result->lease_time = 0;
2194 return 0;
2195 out_overflow:
2196 print_overflow_msg(__func__, xdr);
2197 return -EIO;
2198 }
2199
2200 static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req,
2201 struct xdr_stream *xdr,
2202 struct nfs_fsinfo *result)
2203 {
2204 enum nfs_stat status;
2205 int error;
2206
2207 error = decode_nfsstat3(xdr, &status);
2208 if (unlikely(error))
2209 goto out;
2210 error = decode_post_op_attr(xdr, result->fattr);
2211 if (unlikely(error))
2212 goto out;
2213 if (status != NFS3_OK)
2214 goto out_status;
2215 error = decode_fsinfo3resok(xdr, result);
2216 out:
2217 return error;
2218 out_status:
2219 return nfs3_stat_to_errno(status);
2220 }
2221
2222 /*
2223 * 3.3.20 PATHCONF3res
2224 *
2225 * struct PATHCONF3resok {
2226 * post_op_attr obj_attributes;
2227 * uint32 linkmax;
2228 * uint32 name_max;
2229 * bool no_trunc;
2230 * bool chown_restricted;
2231 * bool case_insensitive;
2232 * bool case_preserving;
2233 * };
2234 *
2235 * struct PATHCONF3resfail {
2236 * post_op_attr obj_attributes;
2237 * };
2238 *
2239 * union PATHCONF3res switch (nfsstat3 status) {
2240 * case NFS3_OK:
2241 * PATHCONF3resok resok;
2242 * default:
2243 * PATHCONF3resfail resfail;
2244 * };
2245 */
2246 static int decode_pathconf3resok(struct xdr_stream *xdr,
2247 struct nfs_pathconf *result)
2248 {
2249 __be32 *p;
2250
2251 p = xdr_inline_decode(xdr, 4 * 6);
2252 if (unlikely(p == NULL))
2253 goto out_overflow;
2254 result->max_link = be32_to_cpup(p++);
2255 result->max_namelen = be32_to_cpup(p);
2256 /* ignore remaining fields */
2257 return 0;
2258 out_overflow:
2259 print_overflow_msg(__func__, xdr);
2260 return -EIO;
2261 }
2262
2263 static int nfs3_xdr_dec_pathconf3res(struct rpc_rqst *req,
2264 struct xdr_stream *xdr,
2265 struct nfs_pathconf *result)
2266 {
2267 enum nfs_stat status;
2268 int error;
2269
2270 error = decode_nfsstat3(xdr, &status);
2271 if (unlikely(error))
2272 goto out;
2273 error = decode_post_op_attr(xdr, result->fattr);
2274 if (unlikely(error))
2275 goto out;
2276 if (status != NFS3_OK)
2277 goto out_status;
2278 error = decode_pathconf3resok(xdr, result);
2279 out:
2280 return error;
2281 out_status:
2282 return nfs3_stat_to_errno(status);
2283 }
2284
2285 /*
2286 * 3.3.21 COMMIT3res
2287 *
2288 * struct COMMIT3resok {
2289 * wcc_data file_wcc;
2290 * writeverf3 verf;
2291 * };
2292 *
2293 * struct COMMIT3resfail {
2294 * wcc_data file_wcc;
2295 * };
2296 *
2297 * union COMMIT3res switch (nfsstat3 status) {
2298 * case NFS3_OK:
2299 * COMMIT3resok resok;
2300 * default:
2301 * COMMIT3resfail resfail;
2302 * };
2303 */
2304 static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req,
2305 struct xdr_stream *xdr,
2306 struct nfs_commitres *result)
2307 {
2308 enum nfs_stat status;
2309 int error;
2310
2311 error = decode_nfsstat3(xdr, &status);
2312 if (unlikely(error))
2313 goto out;
2314 error = decode_wcc_data(xdr, result->fattr);
2315 if (unlikely(error))
2316 goto out;
2317 if (status != NFS3_OK)
2318 goto out_status;
2319 error = decode_writeverf3(xdr, &result->verf->verifier);
2320 out:
2321 return error;
2322 out_status:
2323 return nfs3_stat_to_errno(status);
2324 }
2325
2326 #ifdef CONFIG_NFS_V3_ACL
2327
2328 static inline int decode_getacl3resok(struct xdr_stream *xdr,
2329 struct nfs3_getaclres *result)
2330 {
2331 struct posix_acl **acl;
2332 unsigned int *aclcnt;
2333 size_t hdrlen;
2334 int error;
2335
2336 error = decode_post_op_attr(xdr, result->fattr);
2337 if (unlikely(error))
2338 goto out;
2339 error = decode_uint32(xdr, &result->mask);
2340 if (unlikely(error))
2341 goto out;
2342 error = -EINVAL;
2343 if (result->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
2344 goto out;
2345
2346 hdrlen = xdr_stream_pos(xdr);
2347
2348 acl = NULL;
2349 if (result->mask & NFS_ACL)
2350 acl = &result->acl_access;
2351 aclcnt = NULL;
2352 if (result->mask & NFS_ACLCNT)
2353 aclcnt = &result->acl_access_count;
2354 error = nfsacl_decode(xdr->buf, hdrlen, aclcnt, acl);
2355 if (unlikely(error <= 0))
2356 goto out;
2357
2358 acl = NULL;
2359 if (result->mask & NFS_DFACL)
2360 acl = &result->acl_default;
2361 aclcnt = NULL;
2362 if (result->mask & NFS_DFACLCNT)
2363 aclcnt = &result->acl_default_count;
2364 error = nfsacl_decode(xdr->buf, hdrlen + error, aclcnt, acl);
2365 if (unlikely(error <= 0))
2366 return error;
2367 error = 0;
2368 out:
2369 return error;
2370 }
2371
2372 static int nfs3_xdr_dec_getacl3res(struct rpc_rqst *req,
2373 struct xdr_stream *xdr,
2374 struct nfs3_getaclres *result)
2375 {
2376 enum nfs_stat status;
2377 int error;
2378
2379 error = decode_nfsstat3(xdr, &status);
2380 if (unlikely(error))
2381 goto out;
2382 if (status != NFS3_OK)
2383 goto out_default;
2384 error = decode_getacl3resok(xdr, result);
2385 out:
2386 return error;
2387 out_default:
2388 return nfs3_stat_to_errno(status);
2389 }
2390
2391 static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req,
2392 struct xdr_stream *xdr,
2393 struct nfs_fattr *result)
2394 {
2395 enum nfs_stat status;
2396 int error;
2397
2398 error = decode_nfsstat3(xdr, &status);
2399 if (unlikely(error))
2400 goto out;
2401 if (status != NFS3_OK)
2402 goto out_default;
2403 error = decode_post_op_attr(xdr, result);
2404 out:
2405 return error;
2406 out_default:
2407 return nfs3_stat_to_errno(status);
2408 }
2409
2410 #endif /* CONFIG_NFS_V3_ACL */
2411
2412
2413 /*
2414 * We need to translate between nfs status return values and
2415 * the local errno values which may not be the same.
2416 */
2417 static const struct {
2418 int stat;
2419 int errno;
2420 } nfs_errtbl[] = {
2421 { NFS_OK, 0 },
2422 { NFSERR_PERM, -EPERM },
2423 { NFSERR_NOENT, -ENOENT },
2424 { NFSERR_IO, -errno_NFSERR_IO},
2425 { NFSERR_NXIO, -ENXIO },
2426 /* { NFSERR_EAGAIN, -EAGAIN }, */
2427 { NFSERR_ACCES, -EACCES },
2428 { NFSERR_EXIST, -EEXIST },
2429 { NFSERR_XDEV, -EXDEV },
2430 { NFSERR_NODEV, -ENODEV },
2431 { NFSERR_NOTDIR, -ENOTDIR },
2432 { NFSERR_ISDIR, -EISDIR },
2433 { NFSERR_INVAL, -EINVAL },
2434 { NFSERR_FBIG, -EFBIG },
2435 { NFSERR_NOSPC, -ENOSPC },
2436 { NFSERR_ROFS, -EROFS },
2437 { NFSERR_MLINK, -EMLINK },
2438 { NFSERR_NAMETOOLONG, -ENAMETOOLONG },
2439 { NFSERR_NOTEMPTY, -ENOTEMPTY },
2440 { NFSERR_DQUOT, -EDQUOT },
2441 { NFSERR_STALE, -ESTALE },
2442 { NFSERR_REMOTE, -EREMOTE },
2443 #ifdef EWFLUSH
2444 { NFSERR_WFLUSH, -EWFLUSH },
2445 #endif
2446 { NFSERR_BADHANDLE, -EBADHANDLE },
2447 { NFSERR_NOT_SYNC, -ENOTSYNC },
2448 { NFSERR_BAD_COOKIE, -EBADCOOKIE },
2449 { NFSERR_NOTSUPP, -ENOTSUPP },
2450 { NFSERR_TOOSMALL, -ETOOSMALL },
2451 { NFSERR_SERVERFAULT, -EREMOTEIO },
2452 { NFSERR_BADTYPE, -EBADTYPE },
2453 { NFSERR_JUKEBOX, -EJUKEBOX },
2454 { -1, -EIO }
2455 };
2456
2457 /**
2458 * nfs3_stat_to_errno - convert an NFS status code to a local errno
2459 * @status: NFS status code to convert
2460 *
2461 * Returns a local errno value, or -EIO if the NFS status code is
2462 * not recognized. This function is used jointly by NFSv2 and NFSv3.
2463 */
2464 static int nfs3_stat_to_errno(enum nfs_stat status)
2465 {
2466 int i;
2467
2468 for (i = 0; nfs_errtbl[i].stat != -1; i++) {
2469 if (nfs_errtbl[i].stat == (int)status)
2470 return nfs_errtbl[i].errno;
2471 }
2472 dprintk("NFS: Unrecognized nfs status value: %u\n", status);
2473 return nfs_errtbl[i].errno;
2474 }
2475
2476
2477 #define PROC(proc, argtype, restype, timer) \
2478 [NFS3PROC_##proc] = { \
2479 .p_proc = NFS3PROC_##proc, \
2480 .p_encode = (kxdreproc_t)nfs3_xdr_enc_##argtype##3args, \
2481 .p_decode = (kxdrdproc_t)nfs3_xdr_dec_##restype##3res, \
2482 .p_arglen = NFS3_##argtype##args_sz, \
2483 .p_replen = NFS3_##restype##res_sz, \
2484 .p_timer = timer, \
2485 .p_statidx = NFS3PROC_##proc, \
2486 .p_name = #proc, \
2487 }
2488
2489 struct rpc_procinfo nfs3_procedures[] = {
2490 PROC(GETATTR, getattr, getattr, 1),
2491 PROC(SETATTR, setattr, setattr, 0),
2492 PROC(LOOKUP, lookup, lookup, 2),
2493 PROC(ACCESS, access, access, 1),
2494 PROC(READLINK, readlink, readlink, 3),
2495 PROC(READ, read, read, 3),
2496 PROC(WRITE, write, write, 4),
2497 PROC(CREATE, create, create, 0),
2498 PROC(MKDIR, mkdir, create, 0),
2499 PROC(SYMLINK, symlink, create, 0),
2500 PROC(MKNOD, mknod, create, 0),
2501 PROC(REMOVE, remove, remove, 0),
2502 PROC(RMDIR, lookup, setattr, 0),
2503 PROC(RENAME, rename, rename, 0),
2504 PROC(LINK, link, link, 0),
2505 PROC(READDIR, readdir, readdir, 3),
2506 PROC(READDIRPLUS, readdirplus, readdir, 3),
2507 PROC(FSSTAT, getattr, fsstat, 0),
2508 PROC(FSINFO, getattr, fsinfo, 0),
2509 PROC(PATHCONF, getattr, pathconf, 0),
2510 PROC(COMMIT, commit, commit, 5),
2511 };
2512
2513 const struct rpc_version nfs_version3 = {
2514 .number = 3,
2515 .nrprocs = ARRAY_SIZE(nfs3_procedures),
2516 .procs = nfs3_procedures
2517 };
2518
2519 #ifdef CONFIG_NFS_V3_ACL
2520 static struct rpc_procinfo nfs3_acl_procedures[] = {
2521 [ACLPROC3_GETACL] = {
2522 .p_proc = ACLPROC3_GETACL,
2523 .p_encode = (kxdreproc_t)nfs3_xdr_enc_getacl3args,
2524 .p_decode = (kxdrdproc_t)nfs3_xdr_dec_getacl3res,
2525 .p_arglen = ACL3_getaclargs_sz,
2526 .p_replen = ACL3_getaclres_sz,
2527 .p_timer = 1,
2528 .p_name = "GETACL",
2529 },
2530 [ACLPROC3_SETACL] = {
2531 .p_proc = ACLPROC3_SETACL,
2532 .p_encode = (kxdreproc_t)nfs3_xdr_enc_setacl3args,
2533 .p_decode = (kxdrdproc_t)nfs3_xdr_dec_setacl3res,
2534 .p_arglen = ACL3_setaclargs_sz,
2535 .p_replen = ACL3_setaclres_sz,
2536 .p_timer = 0,
2537 .p_name = "SETACL",
2538 },
2539 };
2540
2541 const struct rpc_version nfsacl_version3 = {
2542 .number = 3,
2543 .nrprocs = sizeof(nfs3_acl_procedures)/
2544 sizeof(nfs3_acl_procedures[0]),
2545 .procs = nfs3_acl_procedures,
2546 };
2547 #endif /* CONFIG_NFS_V3_ACL */
Linux with added FPC-III support