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[linux-2.6/next.git] / fs / nfs / nfs3xdr.c
blob183c6b123d0f53bd43209cd6a6634aaa8b9f484f
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 */
92 static 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 */
107 static 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 */
121 static 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
140 static 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
146 static 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;
155 out_overflow:
156 print_overflow_msg(__func__, xdr);
157 return -EIO;
158 }
159
160 static 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;
169 out_overflow:
170 print_overflow_msg(__func__, xdr);
171 return -EIO;
172 }
173
174 /*
175 * fileid3
176 *
177 * typedef uint64 fileid3;
178 */
179 static __be32 *xdr_decode_fileid3(__be32 *p, u64 *fileid)
180 {
181 return xdr_decode_hyper(p, fileid);
182 }
183
184 static 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 */
194 static 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
204 static 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
223 out_nametoolong:
224 dprintk("NFS: returned filename too long: %u\n", count);
225 return -ENAMETOOLONG;
226 out_overflow:
227 print_overflow_msg(__func__, xdr);
228 return -EIO;
229 }
230
231 /*
232 * nfspath3
233 *
234 * typedef string nfspath3<>;
235 */
236 static 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
244 static 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
265 out_nametoolong:
266 dprintk("NFS: returned pathname too long: %u\n", count);
267 return -ENAMETOOLONG;
268 out_cheating:
269 dprintk("NFS: server cheating in pathname result: "
270 "count %u > recvd %u\n", count, recvd);
271 return -EIO;
272 out_overflow:
273 print_overflow_msg(__func__, xdr);
274 return -EIO;
275 }
276
277 /*
278 * cookie3
279 *
280 * typedef uint64 cookie3
281 */
282 static __be32 *xdr_encode_cookie3(__be32 *p, u64 cookie)
283 {
284 return xdr_encode_hyper(p, cookie);
285 }
286
287 static 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 */
297 static __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
303 static 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;
312 out_overflow:
313 print_overflow_msg(__func__, xdr);
314 return -EIO;
315 }
316
317 /*
318 * createverf3
319 *
320 * typedef opaque createverf3[NFS3_CREATEVERFSIZE];
321 */
322 static 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
330 static 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;
339 out_overflow:
340 print_overflow_msg(__func__, xdr);
341 return -EIO;
342 }
343
344 /*
345 * size3
346 *
347 * typedef uint64 size3;
348 */
349 static __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
364 static 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;
373 out_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 */
391 static void encode_ftype3(struct xdr_stream *xdr, const u32 type)
392 {
393 BUG_ON(type > NF3FIFO);
394 encode_uint32(xdr, type);
395 }
396
397 static __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 */
416 static 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
425 static __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 */
444 static 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
453 static 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;
470 out_toobig:
471 dprintk("NFS: file handle size (%u) too big\n", length);
472 return -E2BIG;
473 out_overflow:
474 print_overflow_msg(__func__, xdr);
475 return -EIO;
476 }
477
478 static 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 */
491 static __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
498 static __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 */
565 static 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 */
651 static 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;
681 out_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 */
696 static 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;
706 out_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 */
719 static 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;
736 out_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 */
757 static 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;
767 out_overflow:
768 print_overflow_msg(__func__, xdr);
769 return -EIO;
770 }
771
772 static 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);
780 out:
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 */
794 static 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;
803 out_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 */
816 static 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 */
838 static 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 */
861 static 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
876 static 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 */
892 static 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 */
907 static 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
914 static 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 */
928 static 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 */
946 static 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
958 static 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 */
985 static 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
1000 static 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 */
1030 static 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
1047 static 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 */
1063 static 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 */
1084 static 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
1091 static 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 */
1123 static 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
1130 static 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
1151 static 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 */
1166 static 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 */
1181 static 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 */
1200 static 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 */
1218 static 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
1231 static 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 */
1251 static 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
1271 static 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 */
1289 static 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
1301 static 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
1310 static 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
1322 static 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 */
1372 static 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);
1385 out:
1386 return error;
1387 out_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 */
1409 static 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;
1424 out:
1425 return error;
1426 out_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 */
1450 static 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);
1469 out:
1470 return error;
1471 out_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 */
1497 static 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);
1513 out:
1514 return error;
1515 out_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 */
1538 static 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);
1554 out:
1555 return error;
1556 out_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 */
1581 static 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
1601 out:
1602 xdr_read_pages(xdr, count);
1603 result->eof = eof;
1604 result->count = count;
1605 return count;
1606 out_mismatch:
1607 dprintk("NFS: READ count doesn't match length of opaque: "
1608 "count %u != ocount %u\n", count, ocount);
1609 return -EIO;
1610 out_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;
1616 out_overflow:
1617 print_overflow_msg(__func__, xdr);
1618 return -EIO;
1619 }
1620
1621 static 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);
1636 out:
1637 return error;
1638 out_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 */
1669 static 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;
1683 out_badvalue:
1684 dprintk("NFS: bad stable_how value: %u\n", result->verf->committed);
1685 return -EIO;
1686 out_overflow:
1687 print_overflow_msg(__func__, xdr);
1688 return -EIO;
1689 }
1690
1691 static 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);
1706 out:
1707 return error;
1708 out_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 */
1732 static 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);
1750 out:
1751 return error;
1752 }
1753
1754 static 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);
1767 out:
1768 return error;
1769 out_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 */
1794 static 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;
1809 out:
1810 return error;
1811 out_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 */
1835 static 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;
1853 out:
1854 return error;
1855 out_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 */
1879 static 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;
1896 out:
1897 return error;
1898 out_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 */
1937 int 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
1997 out_overflow:
1998 print_overflow_msg(__func__, xdr);
1999 return -EAGAIN;
2000 out_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 */
2035 static 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;
2045 out:
2046 xdr_read_pages(xdr, pglen);
2047 return pglen;
2048 out_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
2055 static 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);
2068 out:
2069 return error;
2070 }
2071
2072 static 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);
2085 out:
2086 return error;
2087 out_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 */
2119 static 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;
2135 out_overflow:
2136 print_overflow_msg(__func__, xdr);
2137 return -EIO;
2138 }
2139
2140 static 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);
2156 out:
2157 return error;
2158 out_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 */
2190 static 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;
2211 out_overflow:
2212 print_overflow_msg(__func__, xdr);
2213 return -EIO;
2214 }
2215
2216 static 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);
2232 out:
2233 return error;
2234 out_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 */
2262 static 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;
2274 out_overflow:
2275 print_overflow_msg(__func__, xdr);
2276 return -EIO;
2277 }
2278
2279 static 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);
2295 out:
2296 return error;
2297 out_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 */
2320 static 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);
2336 out:
2337 return error;
2338 out_status:
2339 return nfs_stat_to_errno(status);
2340 }
2341
2342 #ifdef CONFIG_NFS_V3_ACL
2343
2344 static 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;
2384 out:
2385 return error;
2386 }
2387
2388 static 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);
2401 out:
2402 return error;
2403 out_default:
2404 return nfs_stat_to_errno(status);
2405 }
2406
2407 static 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);
2420 out:
2421 return error;
2422 out_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
2440 struct 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
2464 struct 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
2471 static 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
2492 struct 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 */
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