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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[linux-stable.git] / fs / nfs / nfs3xdr.c
blob267126d32ec0f6a1d5d09293ef9427585edca9c6
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 WARN_ON_ONCE(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 encode_uint32(xdr, length);
242 xdr_write_pages(xdr, pages, 0, length);
243 }
244
245 static int decode_nfspath3(struct xdr_stream *xdr)
246 {
247 u32 recvd, count;
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 recvd = xdr_read_pages(xdr, count);
257 if (unlikely(count > recvd))
258 goto out_cheating;
259 xdr_terminate_string(xdr->buf, count);
260 return 0;
261
262 out_nametoolong:
263 dprintk("NFS: returned pathname too long: %u\n", count);
264 return -ENAMETOOLONG;
265 out_cheating:
266 dprintk("NFS: server cheating in pathname result: "
267 "count %u > recvd %u\n", count, recvd);
268 return -EIO;
269 out_overflow:
270 print_overflow_msg(__func__, xdr);
271 return -EIO;
272 }
273
274 /*
275 * cookie3
276 *
277 * typedef uint64 cookie3
278 */
279 static __be32 *xdr_encode_cookie3(__be32 *p, u64 cookie)
280 {
281 return xdr_encode_hyper(p, cookie);
282 }
283
284 static int decode_cookie3(struct xdr_stream *xdr, u64 *cookie)
285 {
286 return decode_uint64(xdr, cookie);
287 }
288
289 /*
290 * cookieverf3
291 *
292 * typedef opaque cookieverf3[NFS3_COOKIEVERFSIZE];
293 */
294 static __be32 *xdr_encode_cookieverf3(__be32 *p, const __be32 *verifier)
295 {
296 memcpy(p, verifier, NFS3_COOKIEVERFSIZE);
297 return p + XDR_QUADLEN(NFS3_COOKIEVERFSIZE);
298 }
299
300 static int decode_cookieverf3(struct xdr_stream *xdr, __be32 *verifier)
301 {
302 __be32 *p;
303
304 p = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE);
305 if (unlikely(p == NULL))
306 goto out_overflow;
307 memcpy(verifier, p, NFS3_COOKIEVERFSIZE);
308 return 0;
309 out_overflow:
310 print_overflow_msg(__func__, xdr);
311 return -EIO;
312 }
313
314 /*
315 * createverf3
316 *
317 * typedef opaque createverf3[NFS3_CREATEVERFSIZE];
318 */
319 static void encode_createverf3(struct xdr_stream *xdr, const __be32 *verifier)
320 {
321 __be32 *p;
322
323 p = xdr_reserve_space(xdr, NFS3_CREATEVERFSIZE);
324 memcpy(p, verifier, NFS3_CREATEVERFSIZE);
325 }
326
327 static int decode_writeverf3(struct xdr_stream *xdr, struct nfs_write_verifier *verifier)
328 {
329 __be32 *p;
330
331 p = xdr_inline_decode(xdr, NFS3_WRITEVERFSIZE);
332 if (unlikely(p == NULL))
333 goto out_overflow;
334 memcpy(verifier->data, p, NFS3_WRITEVERFSIZE);
335 return 0;
336 out_overflow:
337 print_overflow_msg(__func__, xdr);
338 return -EIO;
339 }
340
341 /*
342 * size3
343 *
344 * typedef uint64 size3;
345 */
346 static __be32 *xdr_decode_size3(__be32 *p, u64 *size)
347 {
348 return xdr_decode_hyper(p, size);
349 }
350
351 /*
352 * nfsstat3
353 *
354 * enum nfsstat3 {
355 * NFS3_OK = 0,
356 * ...
357 * }
358 */
359 #define NFS3_OK NFS_OK
360
361 static int decode_nfsstat3(struct xdr_stream *xdr, enum nfs_stat *status)
362 {
363 __be32 *p;
364
365 p = xdr_inline_decode(xdr, 4);
366 if (unlikely(p == NULL))
367 goto out_overflow;
368 *status = be32_to_cpup(p);
369 return 0;
370 out_overflow:
371 print_overflow_msg(__func__, xdr);
372 return -EIO;
373 }
374
375 /*
376 * ftype3
377 *
378 * enum ftype3 {
379 * NF3REG = 1,
380 * NF3DIR = 2,
381 * NF3BLK = 3,
382 * NF3CHR = 4,
383 * NF3LNK = 5,
384 * NF3SOCK = 6,
385 * NF3FIFO = 7
386 * };
387 */
388 static void encode_ftype3(struct xdr_stream *xdr, const u32 type)
389 {
390 encode_uint32(xdr, type);
391 }
392
393 static __be32 *xdr_decode_ftype3(__be32 *p, umode_t *mode)
394 {
395 u32 type;
396
397 type = be32_to_cpup(p++);
398 if (type > NF3FIFO)
399 type = NF3NON;
400 *mode = nfs_type2fmt[type];
401 return p;
402 }
403
404 /*
405 * specdata3
406 *
407 * struct specdata3 {
408 * uint32 specdata1;
409 * uint32 specdata2;
410 * };
411 */
412 static void encode_specdata3(struct xdr_stream *xdr, const dev_t rdev)
413 {
414 __be32 *p;
415
416 p = xdr_reserve_space(xdr, 8);
417 *p++ = cpu_to_be32(MAJOR(rdev));
418 *p = cpu_to_be32(MINOR(rdev));
419 }
420
421 static __be32 *xdr_decode_specdata3(__be32 *p, dev_t *rdev)
422 {
423 unsigned int major, minor;
424
425 major = be32_to_cpup(p++);
426 minor = be32_to_cpup(p++);
427 *rdev = MKDEV(major, minor);
428 if (MAJOR(*rdev) != major || MINOR(*rdev) != minor)
429 *rdev = 0;
430 return p;
431 }
432
433 /*
434 * nfs_fh3
435 *
436 * struct nfs_fh3 {
437 * opaque data<NFS3_FHSIZE>;
438 * };
439 */
440 static void encode_nfs_fh3(struct xdr_stream *xdr, const struct nfs_fh *fh)
441 {
442 __be32 *p;
443
444 WARN_ON_ONCE(fh->size > NFS3_FHSIZE);
445 p = xdr_reserve_space(xdr, 4 + fh->size);
446 xdr_encode_opaque(p, fh->data, fh->size);
447 }
448
449 static int decode_nfs_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
450 {
451 u32 length;
452 __be32 *p;
453
454 p = xdr_inline_decode(xdr, 4);
455 if (unlikely(p == NULL))
456 goto out_overflow;
457 length = be32_to_cpup(p++);
458 if (unlikely(length > NFS3_FHSIZE))
459 goto out_toobig;
460 p = xdr_inline_decode(xdr, length);
461 if (unlikely(p == NULL))
462 goto out_overflow;
463 fh->size = length;
464 memcpy(fh->data, p, length);
465 return 0;
466 out_toobig:
467 dprintk("NFS: file handle size (%u) too big\n", length);
468 return -E2BIG;
469 out_overflow:
470 print_overflow_msg(__func__, xdr);
471 return -EIO;
472 }
473
474 static void zero_nfs_fh3(struct nfs_fh *fh)
475 {
476 memset(fh, 0, sizeof(*fh));
477 }
478
479 /*
480 * nfstime3
481 *
482 * struct nfstime3 {
483 * uint32 seconds;
484 * uint32 nseconds;
485 * };
486 */
487 static __be32 *xdr_encode_nfstime3(__be32 *p, const struct timespec *timep)
488 {
489 *p++ = cpu_to_be32(timep->tv_sec);
490 *p++ = cpu_to_be32(timep->tv_nsec);
491 return p;
492 }
493
494 static __be32 *xdr_decode_nfstime3(__be32 *p, struct timespec *timep)
495 {
496 timep->tv_sec = be32_to_cpup(p++);
497 timep->tv_nsec = be32_to_cpup(p++);
498 return p;
499 }
500
501 /*
502 * sattr3
503 *
504 * enum time_how {
505 * DONT_CHANGE = 0,
506 * SET_TO_SERVER_TIME = 1,
507 * SET_TO_CLIENT_TIME = 2
508 * };
509 *
510 * union set_mode3 switch (bool set_it) {
511 * case TRUE:
512 * mode3 mode;
513 * default:
514 * void;
515 * };
516 *
517 * union set_uid3 switch (bool set_it) {
518 * case TRUE:
519 * uid3 uid;
520 * default:
521 * void;
522 * };
523 *
524 * union set_gid3 switch (bool set_it) {
525 * case TRUE:
526 * gid3 gid;
527 * default:
528 * void;
529 * };
530 *
531 * union set_size3 switch (bool set_it) {
532 * case TRUE:
533 * size3 size;
534 * default:
535 * void;
536 * };
537 *
538 * union set_atime switch (time_how set_it) {
539 * case SET_TO_CLIENT_TIME:
540 * nfstime3 atime;
541 * default:
542 * void;
543 * };
544 *
545 * union set_mtime switch (time_how set_it) {
546 * case SET_TO_CLIENT_TIME:
547 * nfstime3 mtime;
548 * default:
549 * void;
550 * };
551 *
552 * struct sattr3 {
553 * set_mode3 mode;
554 * set_uid3 uid;
555 * set_gid3 gid;
556 * set_size3 size;
557 * set_atime atime;
558 * set_mtime mtime;
559 * };
560 */
561 static void encode_sattr3(struct xdr_stream *xdr, const struct iattr *attr)
562 {
563 u32 nbytes;
564 __be32 *p;
565
566 /*
567 * In order to make only a single xdr_reserve_space() call,
568 * pre-compute the total number of bytes to be reserved.
569 * Six boolean values, one for each set_foo field, are always
570 * present in the encoded result, so start there.
571 */
572 nbytes = 6 * 4;
573 if (attr->ia_valid & ATTR_MODE)
574 nbytes += 4;
575 if (attr->ia_valid & ATTR_UID)
576 nbytes += 4;
577 if (attr->ia_valid & ATTR_GID)
578 nbytes += 4;
579 if (attr->ia_valid & ATTR_SIZE)
580 nbytes += 8;
581 if (attr->ia_valid & ATTR_ATIME_SET)
582 nbytes += 8;
583 if (attr->ia_valid & ATTR_MTIME_SET)
584 nbytes += 8;
585 p = xdr_reserve_space(xdr, nbytes);
586
587 if (attr->ia_valid & ATTR_MODE) {
588 *p++ = xdr_one;
589 *p++ = cpu_to_be32(attr->ia_mode & S_IALLUGO);
590 } else
591 *p++ = xdr_zero;
592
593 if (attr->ia_valid & ATTR_UID) {
594 *p++ = xdr_one;
595 *p++ = cpu_to_be32(from_kuid(&init_user_ns, attr->ia_uid));
596 } else
597 *p++ = xdr_zero;
598
599 if (attr->ia_valid & ATTR_GID) {
600 *p++ = xdr_one;
601 *p++ = cpu_to_be32(from_kgid(&init_user_ns, attr->ia_gid));
602 } else
603 *p++ = xdr_zero;
604
605 if (attr->ia_valid & ATTR_SIZE) {
606 *p++ = xdr_one;
607 p = xdr_encode_hyper(p, (u64)attr->ia_size);
608 } else
609 *p++ = xdr_zero;
610
611 if (attr->ia_valid & ATTR_ATIME_SET) {
612 *p++ = xdr_two;
613 p = xdr_encode_nfstime3(p, &attr->ia_atime);
614 } else if (attr->ia_valid & ATTR_ATIME) {
615 *p++ = xdr_one;
616 } else
617 *p++ = xdr_zero;
618
619 if (attr->ia_valid & ATTR_MTIME_SET) {
620 *p++ = xdr_two;
621 xdr_encode_nfstime3(p, &attr->ia_mtime);
622 } else if (attr->ia_valid & ATTR_MTIME) {
623 *p = xdr_one;
624 } else
625 *p = xdr_zero;
626 }
627
628 /*
629 * fattr3
630 *
631 * struct fattr3 {
632 * ftype3 type;
633 * mode3 mode;
634 * uint32 nlink;
635 * uid3 uid;
636 * gid3 gid;
637 * size3 size;
638 * size3 used;
639 * specdata3 rdev;
640 * uint64 fsid;
641 * fileid3 fileid;
642 * nfstime3 atime;
643 * nfstime3 mtime;
644 * nfstime3 ctime;
645 * };
646 */
647 static int decode_fattr3(struct xdr_stream *xdr, struct nfs_fattr *fattr)
648 {
649 umode_t fmode;
650 __be32 *p;
651
652 p = xdr_inline_decode(xdr, NFS3_fattr_sz << 2);
653 if (unlikely(p == NULL))
654 goto out_overflow;
655
656 p = xdr_decode_ftype3(p, &fmode);
657
658 fattr->mode = (be32_to_cpup(p++) & ~S_IFMT) | fmode;
659 fattr->nlink = be32_to_cpup(p++);
660 fattr->uid = make_kuid(&init_user_ns, be32_to_cpup(p++));
661 if (!uid_valid(fattr->uid))
662 goto out_uid;
663 fattr->gid = make_kgid(&init_user_ns, be32_to_cpup(p++));
664 if (!gid_valid(fattr->gid))
665 goto out_gid;
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 fattr->change_attr = nfs_timespec_to_change_attr(&fattr->ctime);
679
680 fattr->valid |= NFS_ATTR_FATTR_V3;
681 return 0;
682 out_uid:
683 dprintk("NFS: returned invalid uid\n");
684 return -EINVAL;
685 out_gid:
686 dprintk("NFS: returned invalid gid\n");
687 return -EINVAL;
688 out_overflow:
689 print_overflow_msg(__func__, xdr);
690 return -EIO;
691 }
692
693 /*
694 * post_op_attr
695 *
696 * union post_op_attr switch (bool attributes_follow) {
697 * case TRUE:
698 * fattr3 attributes;
699 * case FALSE:
700 * void;
701 * };
702 */
703 static int decode_post_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
704 {
705 __be32 *p;
706
707 p = xdr_inline_decode(xdr, 4);
708 if (unlikely(p == NULL))
709 goto out_overflow;
710 if (*p != xdr_zero)
711 return decode_fattr3(xdr, fattr);
712 return 0;
713 out_overflow:
714 print_overflow_msg(__func__, xdr);
715 return -EIO;
716 }
717
718 /*
719 * wcc_attr
720 * struct wcc_attr {
721 * size3 size;
722 * nfstime3 mtime;
723 * nfstime3 ctime;
724 * };
725 */
726 static int decode_wcc_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
727 {
728 __be32 *p;
729
730 p = xdr_inline_decode(xdr, NFS3_wcc_attr_sz << 2);
731 if (unlikely(p == NULL))
732 goto out_overflow;
733
734 fattr->valid |= NFS_ATTR_FATTR_PRESIZE
735 | NFS_ATTR_FATTR_PRECHANGE
736 | NFS_ATTR_FATTR_PREMTIME
737 | NFS_ATTR_FATTR_PRECTIME;
738
739 p = xdr_decode_size3(p, &fattr->pre_size);
740 p = xdr_decode_nfstime3(p, &fattr->pre_mtime);
741 xdr_decode_nfstime3(p, &fattr->pre_ctime);
742 fattr->pre_change_attr = nfs_timespec_to_change_attr(&fattr->pre_ctime);
743
744 return 0;
745 out_overflow:
746 print_overflow_msg(__func__, xdr);
747 return -EIO;
748 }
749
750 /*
751 * pre_op_attr
752 * union pre_op_attr switch (bool attributes_follow) {
753 * case TRUE:
754 * wcc_attr attributes;
755 * case FALSE:
756 * void;
757 * };
758 *
759 * wcc_data
760 *
761 * struct wcc_data {
762 * pre_op_attr before;
763 * post_op_attr after;
764 * };
765 */
766 static int decode_pre_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
767 {
768 __be32 *p;
769
770 p = xdr_inline_decode(xdr, 4);
771 if (unlikely(p == NULL))
772 goto out_overflow;
773 if (*p != xdr_zero)
774 return decode_wcc_attr(xdr, fattr);
775 return 0;
776 out_overflow:
777 print_overflow_msg(__func__, xdr);
778 return -EIO;
779 }
780
781 static int decode_wcc_data(struct xdr_stream *xdr, struct nfs_fattr *fattr)
782 {
783 int error;
784
785 error = decode_pre_op_attr(xdr, fattr);
786 if (unlikely(error))
787 goto out;
788 error = decode_post_op_attr(xdr, fattr);
789 out:
790 return error;
791 }
792
793 /*
794 * post_op_fh3
795 *
796 * union post_op_fh3 switch (bool handle_follows) {
797 * case TRUE:
798 * nfs_fh3 handle;
799 * case FALSE:
800 * void;
801 * };
802 */
803 static int decode_post_op_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
804 {
805 __be32 *p = xdr_inline_decode(xdr, 4);
806 if (unlikely(p == NULL))
807 goto out_overflow;
808 if (*p != xdr_zero)
809 return decode_nfs_fh3(xdr, fh);
810 zero_nfs_fh3(fh);
811 return 0;
812 out_overflow:
813 print_overflow_msg(__func__, xdr);
814 return -EIO;
815 }
816
817 /*
818 * diropargs3
819 *
820 * struct diropargs3 {
821 * nfs_fh3 dir;
822 * filename3 name;
823 * };
824 */
825 static void encode_diropargs3(struct xdr_stream *xdr, const struct nfs_fh *fh,
826 const char *name, u32 length)
827 {
828 encode_nfs_fh3(xdr, fh);
829 encode_filename3(xdr, name, length);
830 }
831
832
833 /*
834 * NFSv3 XDR encode functions
835 *
836 * NFSv3 argument types are defined in section 3.3 of RFC 1813:
837 * "NFS Version 3 Protocol Specification".
838 */
839
840 /*
841 * 3.3.1 GETATTR3args
842 *
843 * struct GETATTR3args {
844 * nfs_fh3 object;
845 * };
846 */
847 static void nfs3_xdr_enc_getattr3args(struct rpc_rqst *req,
848 struct xdr_stream *xdr,
849 const struct nfs_fh *fh)
850 {
851 encode_nfs_fh3(xdr, fh);
852 }
853
854 /*
855 * 3.3.2 SETATTR3args
856 *
857 * union sattrguard3 switch (bool check) {
858 * case TRUE:
859 * nfstime3 obj_ctime;
860 * case FALSE:
861 * void;
862 * };
863 *
864 * struct SETATTR3args {
865 * nfs_fh3 object;
866 * sattr3 new_attributes;
867 * sattrguard3 guard;
868 * };
869 */
870 static void encode_sattrguard3(struct xdr_stream *xdr,
871 const struct nfs3_sattrargs *args)
872 {
873 __be32 *p;
874
875 if (args->guard) {
876 p = xdr_reserve_space(xdr, 4 + 8);
877 *p++ = xdr_one;
878 xdr_encode_nfstime3(p, &args->guardtime);
879 } else {
880 p = xdr_reserve_space(xdr, 4);
881 *p = xdr_zero;
882 }
883 }
884
885 static void nfs3_xdr_enc_setattr3args(struct rpc_rqst *req,
886 struct xdr_stream *xdr,
887 const struct nfs3_sattrargs *args)
888 {
889 encode_nfs_fh3(xdr, args->fh);
890 encode_sattr3(xdr, args->sattr);
891 encode_sattrguard3(xdr, args);
892 }
893
894 /*
895 * 3.3.3 LOOKUP3args
896 *
897 * struct LOOKUP3args {
898 * diropargs3 what;
899 * };
900 */
901 static void nfs3_xdr_enc_lookup3args(struct rpc_rqst *req,
902 struct xdr_stream *xdr,
903 const struct nfs3_diropargs *args)
904 {
905 encode_diropargs3(xdr, args->fh, args->name, args->len);
906 }
907
908 /*
909 * 3.3.4 ACCESS3args
910 *
911 * struct ACCESS3args {
912 * nfs_fh3 object;
913 * uint32 access;
914 * };
915 */
916 static void encode_access3args(struct xdr_stream *xdr,
917 const struct nfs3_accessargs *args)
918 {
919 encode_nfs_fh3(xdr, args->fh);
920 encode_uint32(xdr, args->access);
921 }
922
923 static void nfs3_xdr_enc_access3args(struct rpc_rqst *req,
924 struct xdr_stream *xdr,
925 const struct nfs3_accessargs *args)
926 {
927 encode_access3args(xdr, args);
928 }
929
930 /*
931 * 3.3.5 READLINK3args
932 *
933 * struct READLINK3args {
934 * nfs_fh3 symlink;
935 * };
936 */
937 static void nfs3_xdr_enc_readlink3args(struct rpc_rqst *req,
938 struct xdr_stream *xdr,
939 const struct nfs3_readlinkargs *args)
940 {
941 encode_nfs_fh3(xdr, args->fh);
942 prepare_reply_buffer(req, args->pages, args->pgbase,
943 args->pglen, NFS3_readlinkres_sz);
944 }
945
946 /*
947 * 3.3.6 READ3args
948 *
949 * struct READ3args {
950 * nfs_fh3 file;
951 * offset3 offset;
952 * count3 count;
953 * };
954 */
955 static void encode_read3args(struct xdr_stream *xdr,
956 const struct nfs_pgio_args *args)
957 {
958 __be32 *p;
959
960 encode_nfs_fh3(xdr, args->fh);
961
962 p = xdr_reserve_space(xdr, 8 + 4);
963 p = xdr_encode_hyper(p, args->offset);
964 *p = cpu_to_be32(args->count);
965 }
966
967 static void nfs3_xdr_enc_read3args(struct rpc_rqst *req,
968 struct xdr_stream *xdr,
969 const struct nfs_pgio_args *args)
970 {
971 encode_read3args(xdr, args);
972 prepare_reply_buffer(req, args->pages, args->pgbase,
973 args->count, NFS3_readres_sz);
974 req->rq_rcv_buf.flags |= XDRBUF_READ;
975 }
976
977 /*
978 * 3.3.7 WRITE3args
979 *
980 * enum stable_how {
981 * UNSTABLE = 0,
982 * DATA_SYNC = 1,
983 * FILE_SYNC = 2
984 * };
985 *
986 * struct WRITE3args {
987 * nfs_fh3 file;
988 * offset3 offset;
989 * count3 count;
990 * stable_how stable;
991 * opaque data<>;
992 * };
993 */
994 static void encode_write3args(struct xdr_stream *xdr,
995 const struct nfs_pgio_args *args)
996 {
997 __be32 *p;
998
999 encode_nfs_fh3(xdr, args->fh);
1000
1001 p = xdr_reserve_space(xdr, 8 + 4 + 4 + 4);
1002 p = xdr_encode_hyper(p, args->offset);
1003 *p++ = cpu_to_be32(args->count);
1004 *p++ = cpu_to_be32(args->stable);
1005 *p = cpu_to_be32(args->count);
1006 xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
1007 }
1008
1009 static void nfs3_xdr_enc_write3args(struct rpc_rqst *req,
1010 struct xdr_stream *xdr,
1011 const struct nfs_pgio_args *args)
1012 {
1013 encode_write3args(xdr, args);
1014 xdr->buf->flags |= XDRBUF_WRITE;
1015 }
1016
1017 /*
1018 * 3.3.8 CREATE3args
1019 *
1020 * enum createmode3 {
1021 * UNCHECKED = 0,
1022 * GUARDED = 1,
1023 * EXCLUSIVE = 2
1024 * };
1025 *
1026 * union createhow3 switch (createmode3 mode) {
1027 * case UNCHECKED:
1028 * case GUARDED:
1029 * sattr3 obj_attributes;
1030 * case EXCLUSIVE:
1031 * createverf3 verf;
1032 * };
1033 *
1034 * struct CREATE3args {
1035 * diropargs3 where;
1036 * createhow3 how;
1037 * };
1038 */
1039 static void encode_createhow3(struct xdr_stream *xdr,
1040 const struct nfs3_createargs *args)
1041 {
1042 encode_uint32(xdr, args->createmode);
1043 switch (args->createmode) {
1044 case NFS3_CREATE_UNCHECKED:
1045 case NFS3_CREATE_GUARDED:
1046 encode_sattr3(xdr, args->sattr);
1047 break;
1048 case NFS3_CREATE_EXCLUSIVE:
1049 encode_createverf3(xdr, args->verifier);
1050 break;
1051 default:
1052 BUG();
1053 }
1054 }
1055
1056 static void nfs3_xdr_enc_create3args(struct rpc_rqst *req,
1057 struct xdr_stream *xdr,
1058 const struct nfs3_createargs *args)
1059 {
1060 encode_diropargs3(xdr, args->fh, args->name, args->len);
1061 encode_createhow3(xdr, args);
1062 }
1063
1064 /*
1065 * 3.3.9 MKDIR3args
1066 *
1067 * struct MKDIR3args {
1068 * diropargs3 where;
1069 * sattr3 attributes;
1070 * };
1071 */
1072 static void nfs3_xdr_enc_mkdir3args(struct rpc_rqst *req,
1073 struct xdr_stream *xdr,
1074 const struct nfs3_mkdirargs *args)
1075 {
1076 encode_diropargs3(xdr, args->fh, args->name, args->len);
1077 encode_sattr3(xdr, args->sattr);
1078 }
1079
1080 /*
1081 * 3.3.10 SYMLINK3args
1082 *
1083 * struct symlinkdata3 {
1084 * sattr3 symlink_attributes;
1085 * nfspath3 symlink_data;
1086 * };
1087 *
1088 * struct SYMLINK3args {
1089 * diropargs3 where;
1090 * symlinkdata3 symlink;
1091 * };
1092 */
1093 static void encode_symlinkdata3(struct xdr_stream *xdr,
1094 const struct nfs3_symlinkargs *args)
1095 {
1096 encode_sattr3(xdr, args->sattr);
1097 encode_nfspath3(xdr, args->pages, args->pathlen);
1098 }
1099
1100 static void nfs3_xdr_enc_symlink3args(struct rpc_rqst *req,
1101 struct xdr_stream *xdr,
1102 const struct nfs3_symlinkargs *args)
1103 {
1104 encode_diropargs3(xdr, args->fromfh, args->fromname, args->fromlen);
1105 encode_symlinkdata3(xdr, args);
1106 xdr->buf->flags |= XDRBUF_WRITE;
1107 }
1108
1109 /*
1110 * 3.3.11 MKNOD3args
1111 *
1112 * struct devicedata3 {
1113 * sattr3 dev_attributes;
1114 * specdata3 spec;
1115 * };
1116 *
1117 * union mknoddata3 switch (ftype3 type) {
1118 * case NF3CHR:
1119 * case NF3BLK:
1120 * devicedata3 device;
1121 * case NF3SOCK:
1122 * case NF3FIFO:
1123 * sattr3 pipe_attributes;
1124 * default:
1125 * void;
1126 * };
1127 *
1128 * struct MKNOD3args {
1129 * diropargs3 where;
1130 * mknoddata3 what;
1131 * };
1132 */
1133 static void encode_devicedata3(struct xdr_stream *xdr,
1134 const struct nfs3_mknodargs *args)
1135 {
1136 encode_sattr3(xdr, args->sattr);
1137 encode_specdata3(xdr, args->rdev);
1138 }
1139
1140 static void encode_mknoddata3(struct xdr_stream *xdr,
1141 const struct nfs3_mknodargs *args)
1142 {
1143 encode_ftype3(xdr, args->type);
1144 switch (args->type) {
1145 case NF3CHR:
1146 case NF3BLK:
1147 encode_devicedata3(xdr, args);
1148 break;
1149 case NF3SOCK:
1150 case NF3FIFO:
1151 encode_sattr3(xdr, args->sattr);
1152 break;
1153 case NF3REG:
1154 case NF3DIR:
1155 break;
1156 default:
1157 BUG();
1158 }
1159 }
1160
1161 static void nfs3_xdr_enc_mknod3args(struct rpc_rqst *req,
1162 struct xdr_stream *xdr,
1163 const struct nfs3_mknodargs *args)
1164 {
1165 encode_diropargs3(xdr, args->fh, args->name, args->len);
1166 encode_mknoddata3(xdr, args);
1167 }
1168
1169 /*
1170 * 3.3.12 REMOVE3args
1171 *
1172 * struct REMOVE3args {
1173 * diropargs3 object;
1174 * };
1175 */
1176 static void nfs3_xdr_enc_remove3args(struct rpc_rqst *req,
1177 struct xdr_stream *xdr,
1178 const struct nfs_removeargs *args)
1179 {
1180 encode_diropargs3(xdr, args->fh, args->name.name, args->name.len);
1181 }
1182
1183 /*
1184 * 3.3.14 RENAME3args
1185 *
1186 * struct RENAME3args {
1187 * diropargs3 from;
1188 * diropargs3 to;
1189 * };
1190 */
1191 static void nfs3_xdr_enc_rename3args(struct rpc_rqst *req,
1192 struct xdr_stream *xdr,
1193 const struct nfs_renameargs *args)
1194 {
1195 const struct qstr *old = args->old_name;
1196 const struct qstr *new = args->new_name;
1197
1198 encode_diropargs3(xdr, args->old_dir, old->name, old->len);
1199 encode_diropargs3(xdr, args->new_dir, new->name, new->len);
1200 }
1201
1202 /*
1203 * 3.3.15 LINK3args
1204 *
1205 * struct LINK3args {
1206 * nfs_fh3 file;
1207 * diropargs3 link;
1208 * };
1209 */
1210 static void nfs3_xdr_enc_link3args(struct rpc_rqst *req,
1211 struct xdr_stream *xdr,
1212 const struct nfs3_linkargs *args)
1213 {
1214 encode_nfs_fh3(xdr, args->fromfh);
1215 encode_diropargs3(xdr, args->tofh, args->toname, args->tolen);
1216 }
1217
1218 /*
1219 * 3.3.16 READDIR3args
1220 *
1221 * struct READDIR3args {
1222 * nfs_fh3 dir;
1223 * cookie3 cookie;
1224 * cookieverf3 cookieverf;
1225 * count3 count;
1226 * };
1227 */
1228 static void encode_readdir3args(struct xdr_stream *xdr,
1229 const struct nfs3_readdirargs *args)
1230 {
1231 __be32 *p;
1232
1233 encode_nfs_fh3(xdr, args->fh);
1234
1235 p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4);
1236 p = xdr_encode_cookie3(p, args->cookie);
1237 p = xdr_encode_cookieverf3(p, args->verf);
1238 *p = cpu_to_be32(args->count);
1239 }
1240
1241 static void nfs3_xdr_enc_readdir3args(struct rpc_rqst *req,
1242 struct xdr_stream *xdr,
1243 const struct nfs3_readdirargs *args)
1244 {
1245 encode_readdir3args(xdr, args);
1246 prepare_reply_buffer(req, args->pages, 0,
1247 args->count, NFS3_readdirres_sz);
1248 }
1249
1250 /*
1251 * 3.3.17 READDIRPLUS3args
1252 *
1253 * struct READDIRPLUS3args {
1254 * nfs_fh3 dir;
1255 * cookie3 cookie;
1256 * cookieverf3 cookieverf;
1257 * count3 dircount;
1258 * count3 maxcount;
1259 * };
1260 */
1261 static void encode_readdirplus3args(struct xdr_stream *xdr,
1262 const struct nfs3_readdirargs *args)
1263 {
1264 __be32 *p;
1265
1266 encode_nfs_fh3(xdr, args->fh);
1267
1268 p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4 + 4);
1269 p = xdr_encode_cookie3(p, args->cookie);
1270 p = xdr_encode_cookieverf3(p, args->verf);
1271
1272 /*
1273 * readdirplus: need dircount + buffer size.
1274 * We just make sure we make dircount big enough
1275 */
1276 *p++ = cpu_to_be32(args->count >> 3);
1277
1278 *p = cpu_to_be32(args->count);
1279 }
1280
1281 static void nfs3_xdr_enc_readdirplus3args(struct rpc_rqst *req,
1282 struct xdr_stream *xdr,
1283 const struct nfs3_readdirargs *args)
1284 {
1285 encode_readdirplus3args(xdr, args);
1286 prepare_reply_buffer(req, args->pages, 0,
1287 args->count, NFS3_readdirres_sz);
1288 }
1289
1290 /*
1291 * 3.3.21 COMMIT3args
1292 *
1293 * struct COMMIT3args {
1294 * nfs_fh3 file;
1295 * offset3 offset;
1296 * count3 count;
1297 * };
1298 */
1299 static void encode_commit3args(struct xdr_stream *xdr,
1300 const struct nfs_commitargs *args)
1301 {
1302 __be32 *p;
1303
1304 encode_nfs_fh3(xdr, args->fh);
1305
1306 p = xdr_reserve_space(xdr, 8 + 4);
1307 p = xdr_encode_hyper(p, args->offset);
1308 *p = cpu_to_be32(args->count);
1309 }
1310
1311 static void nfs3_xdr_enc_commit3args(struct rpc_rqst *req,
1312 struct xdr_stream *xdr,
1313 const struct nfs_commitargs *args)
1314 {
1315 encode_commit3args(xdr, args);
1316 }
1317
1318 #ifdef CONFIG_NFS_V3_ACL
1319
1320 static void nfs3_xdr_enc_getacl3args(struct rpc_rqst *req,
1321 struct xdr_stream *xdr,
1322 const struct nfs3_getaclargs *args)
1323 {
1324 encode_nfs_fh3(xdr, args->fh);
1325 encode_uint32(xdr, args->mask);
1326 if (args->mask & (NFS_ACL | NFS_DFACL))
1327 prepare_reply_buffer(req, args->pages, 0,
1328 NFSACL_MAXPAGES << PAGE_SHIFT,
1329 ACL3_getaclres_sz);
1330 }
1331
1332 static void nfs3_xdr_enc_setacl3args(struct rpc_rqst *req,
1333 struct xdr_stream *xdr,
1334 const struct nfs3_setaclargs *args)
1335 {
1336 unsigned int base;
1337 int error;
1338
1339 encode_nfs_fh3(xdr, NFS_FH(args->inode));
1340 encode_uint32(xdr, args->mask);
1341
1342 base = req->rq_slen;
1343 if (args->npages != 0)
1344 xdr_write_pages(xdr, args->pages, 0, args->len);
1345 else
1346 xdr_reserve_space(xdr, args->len);
1347
1348 error = nfsacl_encode(xdr->buf, base, args->inode,
1349 (args->mask & NFS_ACL) ?
1350 args->acl_access : NULL, 1, 0);
1351 /* FIXME: this is just broken */
1352 BUG_ON(error < 0);
1353 error = nfsacl_encode(xdr->buf, base + error, args->inode,
1354 (args->mask & NFS_DFACL) ?
1355 args->acl_default : NULL, 1,
1356 NFS_ACL_DEFAULT);
1357 BUG_ON(error < 0);
1358 }
1359
1360 #endif /* CONFIG_NFS_V3_ACL */
1361
1362 /*
1363 * NFSv3 XDR decode functions
1364 *
1365 * NFSv3 result types are defined in section 3.3 of RFC 1813:
1366 * "NFS Version 3 Protocol Specification".
1367 */
1368
1369 /*
1370 * 3.3.1 GETATTR3res
1371 *
1372 * struct GETATTR3resok {
1373 * fattr3 obj_attributes;
1374 * };
1375 *
1376 * union GETATTR3res switch (nfsstat3 status) {
1377 * case NFS3_OK:
1378 * GETATTR3resok resok;
1379 * default:
1380 * void;
1381 * };
1382 */
1383 static int nfs3_xdr_dec_getattr3res(struct rpc_rqst *req,
1384 struct xdr_stream *xdr,
1385 struct nfs_fattr *result)
1386 {
1387 enum nfs_stat status;
1388 int error;
1389
1390 error = decode_nfsstat3(xdr, &status);
1391 if (unlikely(error))
1392 goto out;
1393 if (status != NFS3_OK)
1394 goto out_default;
1395 error = decode_fattr3(xdr, result);
1396 out:
1397 return error;
1398 out_default:
1399 return nfs3_stat_to_errno(status);
1400 }
1401
1402 /*
1403 * 3.3.2 SETATTR3res
1404 *
1405 * struct SETATTR3resok {
1406 * wcc_data obj_wcc;
1407 * };
1408 *
1409 * struct SETATTR3resfail {
1410 * wcc_data obj_wcc;
1411 * };
1412 *
1413 * union SETATTR3res switch (nfsstat3 status) {
1414 * case NFS3_OK:
1415 * SETATTR3resok resok;
1416 * default:
1417 * SETATTR3resfail resfail;
1418 * };
1419 */
1420 static int nfs3_xdr_dec_setattr3res(struct rpc_rqst *req,
1421 struct xdr_stream *xdr,
1422 struct nfs_fattr *result)
1423 {
1424 enum nfs_stat status;
1425 int error;
1426
1427 error = decode_nfsstat3(xdr, &status);
1428 if (unlikely(error))
1429 goto out;
1430 error = decode_wcc_data(xdr, result);
1431 if (unlikely(error))
1432 goto out;
1433 if (status != NFS3_OK)
1434 goto out_status;
1435 out:
1436 return error;
1437 out_status:
1438 return nfs3_stat_to_errno(status);
1439 }
1440
1441 /*
1442 * 3.3.3 LOOKUP3res
1443 *
1444 * struct LOOKUP3resok {
1445 * nfs_fh3 object;
1446 * post_op_attr obj_attributes;
1447 * post_op_attr dir_attributes;
1448 * };
1449 *
1450 * struct LOOKUP3resfail {
1451 * post_op_attr dir_attributes;
1452 * };
1453 *
1454 * union LOOKUP3res switch (nfsstat3 status) {
1455 * case NFS3_OK:
1456 * LOOKUP3resok resok;
1457 * default:
1458 * LOOKUP3resfail resfail;
1459 * };
1460 */
1461 static int nfs3_xdr_dec_lookup3res(struct rpc_rqst *req,
1462 struct xdr_stream *xdr,
1463 struct nfs3_diropres *result)
1464 {
1465 enum nfs_stat status;
1466 int error;
1467
1468 error = decode_nfsstat3(xdr, &status);
1469 if (unlikely(error))
1470 goto out;
1471 if (status != NFS3_OK)
1472 goto out_default;
1473 error = decode_nfs_fh3(xdr, result->fh);
1474 if (unlikely(error))
1475 goto out;
1476 error = decode_post_op_attr(xdr, result->fattr);
1477 if (unlikely(error))
1478 goto out;
1479 error = decode_post_op_attr(xdr, result->dir_attr);
1480 out:
1481 return error;
1482 out_default:
1483 error = decode_post_op_attr(xdr, result->dir_attr);
1484 if (unlikely(error))
1485 goto out;
1486 return nfs3_stat_to_errno(status);
1487 }
1488
1489 /*
1490 * 3.3.4 ACCESS3res
1491 *
1492 * struct ACCESS3resok {
1493 * post_op_attr obj_attributes;
1494 * uint32 access;
1495 * };
1496 *
1497 * struct ACCESS3resfail {
1498 * post_op_attr obj_attributes;
1499 * };
1500 *
1501 * union ACCESS3res switch (nfsstat3 status) {
1502 * case NFS3_OK:
1503 * ACCESS3resok resok;
1504 * default:
1505 * ACCESS3resfail resfail;
1506 * };
1507 */
1508 static int nfs3_xdr_dec_access3res(struct rpc_rqst *req,
1509 struct xdr_stream *xdr,
1510 struct nfs3_accessres *result)
1511 {
1512 enum nfs_stat status;
1513 int error;
1514
1515 error = decode_nfsstat3(xdr, &status);
1516 if (unlikely(error))
1517 goto out;
1518 error = decode_post_op_attr(xdr, result->fattr);
1519 if (unlikely(error))
1520 goto out;
1521 if (status != NFS3_OK)
1522 goto out_default;
1523 error = decode_uint32(xdr, &result->access);
1524 out:
1525 return error;
1526 out_default:
1527 return nfs3_stat_to_errno(status);
1528 }
1529
1530 /*
1531 * 3.3.5 READLINK3res
1532 *
1533 * struct READLINK3resok {
1534 * post_op_attr symlink_attributes;
1535 * nfspath3 data;
1536 * };
1537 *
1538 * struct READLINK3resfail {
1539 * post_op_attr symlink_attributes;
1540 * };
1541 *
1542 * union READLINK3res switch (nfsstat3 status) {
1543 * case NFS3_OK:
1544 * READLINK3resok resok;
1545 * default:
1546 * READLINK3resfail resfail;
1547 * };
1548 */
1549 static int nfs3_xdr_dec_readlink3res(struct rpc_rqst *req,
1550 struct xdr_stream *xdr,
1551 struct nfs_fattr *result)
1552 {
1553 enum nfs_stat status;
1554 int error;
1555
1556 error = decode_nfsstat3(xdr, &status);
1557 if (unlikely(error))
1558 goto out;
1559 error = decode_post_op_attr(xdr, result);
1560 if (unlikely(error))
1561 goto out;
1562 if (status != NFS3_OK)
1563 goto out_default;
1564 error = decode_nfspath3(xdr);
1565 out:
1566 return error;
1567 out_default:
1568 return nfs3_stat_to_errno(status);
1569 }
1570
1571 /*
1572 * 3.3.6 READ3res
1573 *
1574 * struct READ3resok {
1575 * post_op_attr file_attributes;
1576 * count3 count;
1577 * bool eof;
1578 * opaque data<>;
1579 * };
1580 *
1581 * struct READ3resfail {
1582 * post_op_attr file_attributes;
1583 * };
1584 *
1585 * union READ3res switch (nfsstat3 status) {
1586 * case NFS3_OK:
1587 * READ3resok resok;
1588 * default:
1589 * READ3resfail resfail;
1590 * };
1591 */
1592 static int decode_read3resok(struct xdr_stream *xdr,
1593 struct nfs_pgio_res *result)
1594 {
1595 u32 eof, count, ocount, recvd;
1596 __be32 *p;
1597
1598 p = xdr_inline_decode(xdr, 4 + 4 + 4);
1599 if (unlikely(p == NULL))
1600 goto out_overflow;
1601 count = be32_to_cpup(p++);
1602 eof = be32_to_cpup(p++);
1603 ocount = be32_to_cpup(p++);
1604 if (unlikely(ocount != count))
1605 goto out_mismatch;
1606 recvd = xdr_read_pages(xdr, count);
1607 if (unlikely(count > recvd))
1608 goto out_cheating;
1609 out:
1610 result->eof = eof;
1611 result->count = count;
1612 return count;
1613 out_mismatch:
1614 dprintk("NFS: READ count doesn't match length of opaque: "
1615 "count %u != ocount %u\n", count, ocount);
1616 return -EIO;
1617 out_cheating:
1618 dprintk("NFS: server cheating in read result: "
1619 "count %u > recvd %u\n", count, recvd);
1620 count = recvd;
1621 eof = 0;
1622 goto out;
1623 out_overflow:
1624 print_overflow_msg(__func__, xdr);
1625 return -EIO;
1626 }
1627
1628 static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1629 struct nfs_pgio_res *result)
1630 {
1631 enum nfs_stat status;
1632 int error;
1633
1634 error = decode_nfsstat3(xdr, &status);
1635 if (unlikely(error))
1636 goto out;
1637 error = decode_post_op_attr(xdr, result->fattr);
1638 if (unlikely(error))
1639 goto out;
1640 result->op_status = status;
1641 if (status != NFS3_OK)
1642 goto out_status;
1643 error = decode_read3resok(xdr, result);
1644 out:
1645 return error;
1646 out_status:
1647 return nfs3_stat_to_errno(status);
1648 }
1649
1650 /*
1651 * 3.3.7 WRITE3res
1652 *
1653 * enum stable_how {
1654 * UNSTABLE = 0,
1655 * DATA_SYNC = 1,
1656 * FILE_SYNC = 2
1657 * };
1658 *
1659 * struct WRITE3resok {
1660 * wcc_data file_wcc;
1661 * count3 count;
1662 * stable_how committed;
1663 * writeverf3 verf;
1664 * };
1665 *
1666 * struct WRITE3resfail {
1667 * wcc_data file_wcc;
1668 * };
1669 *
1670 * union WRITE3res switch (nfsstat3 status) {
1671 * case NFS3_OK:
1672 * WRITE3resok resok;
1673 * default:
1674 * WRITE3resfail resfail;
1675 * };
1676 */
1677 static int decode_write3resok(struct xdr_stream *xdr,
1678 struct nfs_pgio_res *result)
1679 {
1680 __be32 *p;
1681
1682 p = xdr_inline_decode(xdr, 4 + 4);
1683 if (unlikely(p == NULL))
1684 goto out_overflow;
1685 result->count = be32_to_cpup(p++);
1686 result->verf->committed = be32_to_cpup(p++);
1687 if (unlikely(result->verf->committed > NFS_FILE_SYNC))
1688 goto out_badvalue;
1689 if (decode_writeverf3(xdr, &result->verf->verifier))
1690 goto out_eio;
1691 return result->count;
1692 out_badvalue:
1693 dprintk("NFS: bad stable_how value: %u\n", result->verf->committed);
1694 return -EIO;
1695 out_overflow:
1696 print_overflow_msg(__func__, xdr);
1697 out_eio:
1698 return -EIO;
1699 }
1700
1701 static int nfs3_xdr_dec_write3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1702 struct nfs_pgio_res *result)
1703 {
1704 enum nfs_stat status;
1705 int error;
1706
1707 error = decode_nfsstat3(xdr, &status);
1708 if (unlikely(error))
1709 goto out;
1710 error = decode_wcc_data(xdr, result->fattr);
1711 if (unlikely(error))
1712 goto out;
1713 result->op_status = status;
1714 if (status != NFS3_OK)
1715 goto out_status;
1716 error = decode_write3resok(xdr, result);
1717 out:
1718 return error;
1719 out_status:
1720 return nfs3_stat_to_errno(status);
1721 }
1722
1723 /*
1724 * 3.3.8 CREATE3res
1725 *
1726 * struct CREATE3resok {
1727 * post_op_fh3 obj;
1728 * post_op_attr obj_attributes;
1729 * wcc_data dir_wcc;
1730 * };
1731 *
1732 * struct CREATE3resfail {
1733 * wcc_data dir_wcc;
1734 * };
1735 *
1736 * union CREATE3res switch (nfsstat3 status) {
1737 * case NFS3_OK:
1738 * CREATE3resok resok;
1739 * default:
1740 * CREATE3resfail resfail;
1741 * };
1742 */
1743 static int decode_create3resok(struct xdr_stream *xdr,
1744 struct nfs3_diropres *result)
1745 {
1746 int error;
1747
1748 error = decode_post_op_fh3(xdr, result->fh);
1749 if (unlikely(error))
1750 goto out;
1751 error = decode_post_op_attr(xdr, result->fattr);
1752 if (unlikely(error))
1753 goto out;
1754 /* The server isn't required to return a file handle.
1755 * If it didn't, force the client to perform a LOOKUP
1756 * to determine the correct file handle and attribute
1757 * values for the new object. */
1758 if (result->fh->size == 0)
1759 result->fattr->valid = 0;
1760 error = decode_wcc_data(xdr, result->dir_attr);
1761 out:
1762 return error;
1763 }
1764
1765 static int nfs3_xdr_dec_create3res(struct rpc_rqst *req,
1766 struct xdr_stream *xdr,
1767 struct nfs3_diropres *result)
1768 {
1769 enum nfs_stat status;
1770 int error;
1771
1772 error = decode_nfsstat3(xdr, &status);
1773 if (unlikely(error))
1774 goto out;
1775 if (status != NFS3_OK)
1776 goto out_default;
1777 error = decode_create3resok(xdr, result);
1778 out:
1779 return error;
1780 out_default:
1781 error = decode_wcc_data(xdr, result->dir_attr);
1782 if (unlikely(error))
1783 goto out;
1784 return nfs3_stat_to_errno(status);
1785 }
1786
1787 /*
1788 * 3.3.12 REMOVE3res
1789 *
1790 * struct REMOVE3resok {
1791 * wcc_data dir_wcc;
1792 * };
1793 *
1794 * struct REMOVE3resfail {
1795 * wcc_data dir_wcc;
1796 * };
1797 *
1798 * union REMOVE3res switch (nfsstat3 status) {
1799 * case NFS3_OK:
1800 * REMOVE3resok resok;
1801 * default:
1802 * REMOVE3resfail resfail;
1803 * };
1804 */
1805 static int nfs3_xdr_dec_remove3res(struct rpc_rqst *req,
1806 struct xdr_stream *xdr,
1807 struct nfs_removeres *result)
1808 {
1809 enum nfs_stat status;
1810 int error;
1811
1812 error = decode_nfsstat3(xdr, &status);
1813 if (unlikely(error))
1814 goto out;
1815 error = decode_wcc_data(xdr, result->dir_attr);
1816 if (unlikely(error))
1817 goto out;
1818 if (status != NFS3_OK)
1819 goto out_status;
1820 out:
1821 return error;
1822 out_status:
1823 return nfs3_stat_to_errno(status);
1824 }
1825
1826 /*
1827 * 3.3.14 RENAME3res
1828 *
1829 * struct RENAME3resok {
1830 * wcc_data fromdir_wcc;
1831 * wcc_data todir_wcc;
1832 * };
1833 *
1834 * struct RENAME3resfail {
1835 * wcc_data fromdir_wcc;
1836 * wcc_data todir_wcc;
1837 * };
1838 *
1839 * union RENAME3res switch (nfsstat3 status) {
1840 * case NFS3_OK:
1841 * RENAME3resok resok;
1842 * default:
1843 * RENAME3resfail resfail;
1844 * };
1845 */
1846 static int nfs3_xdr_dec_rename3res(struct rpc_rqst *req,
1847 struct xdr_stream *xdr,
1848 struct nfs_renameres *result)
1849 {
1850 enum nfs_stat status;
1851 int error;
1852
1853 error = decode_nfsstat3(xdr, &status);
1854 if (unlikely(error))
1855 goto out;
1856 error = decode_wcc_data(xdr, result->old_fattr);
1857 if (unlikely(error))
1858 goto out;
1859 error = decode_wcc_data(xdr, result->new_fattr);
1860 if (unlikely(error))
1861 goto out;
1862 if (status != NFS3_OK)
1863 goto out_status;
1864 out:
1865 return error;
1866 out_status:
1867 return nfs3_stat_to_errno(status);
1868 }
1869
1870 /*
1871 * 3.3.15 LINK3res
1872 *
1873 * struct LINK3resok {
1874 * post_op_attr file_attributes;
1875 * wcc_data linkdir_wcc;
1876 * };
1877 *
1878 * struct LINK3resfail {
1879 * post_op_attr file_attributes;
1880 * wcc_data linkdir_wcc;
1881 * };
1882 *
1883 * union LINK3res switch (nfsstat3 status) {
1884 * case NFS3_OK:
1885 * LINK3resok resok;
1886 * default:
1887 * LINK3resfail resfail;
1888 * };
1889 */
1890 static int nfs3_xdr_dec_link3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1891 struct nfs3_linkres *result)
1892 {
1893 enum nfs_stat status;
1894 int error;
1895
1896 error = decode_nfsstat3(xdr, &status);
1897 if (unlikely(error))
1898 goto out;
1899 error = decode_post_op_attr(xdr, result->fattr);
1900 if (unlikely(error))
1901 goto out;
1902 error = decode_wcc_data(xdr, result->dir_attr);
1903 if (unlikely(error))
1904 goto out;
1905 if (status != NFS3_OK)
1906 goto out_status;
1907 out:
1908 return error;
1909 out_status:
1910 return nfs3_stat_to_errno(status);
1911 }
1912
1913 /**
1914 * nfs3_decode_dirent - Decode a single NFSv3 directory entry stored in
1915 * the local page cache
1916 * @xdr: XDR stream where entry resides
1917 * @entry: buffer to fill in with entry data
1918 * @plus: boolean indicating whether this should be a readdirplus entry
1919 *
1920 * Returns zero if successful, otherwise a negative errno value is
1921 * returned.
1922 *
1923 * This function is not invoked during READDIR reply decoding, but
1924 * rather whenever an application invokes the getdents(2) system call
1925 * on a directory already in our cache.
1926 *
1927 * 3.3.16 entry3
1928 *
1929 * struct entry3 {
1930 * fileid3 fileid;
1931 * filename3 name;
1932 * cookie3 cookie;
1933 * fhandle3 filehandle;
1934 * post_op_attr3 attributes;
1935 * entry3 *nextentry;
1936 * };
1937 *
1938 * 3.3.17 entryplus3
1939 * struct entryplus3 {
1940 * fileid3 fileid;
1941 * filename3 name;
1942 * cookie3 cookie;
1943 * post_op_attr name_attributes;
1944 * post_op_fh3 name_handle;
1945 * entryplus3 *nextentry;
1946 * };
1947 */
1948 int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
1949 int plus)
1950 {
1951 struct nfs_entry old = *entry;
1952 __be32 *p;
1953 int error;
1954
1955 p = xdr_inline_decode(xdr, 4);
1956 if (unlikely(p == NULL))
1957 goto out_overflow;
1958 if (*p == xdr_zero) {
1959 p = xdr_inline_decode(xdr, 4);
1960 if (unlikely(p == NULL))
1961 goto out_overflow;
1962 if (*p == xdr_zero)
1963 return -EAGAIN;
1964 entry->eof = 1;
1965 return -EBADCOOKIE;
1966 }
1967
1968 error = decode_fileid3(xdr, &entry->ino);
1969 if (unlikely(error))
1970 return error;
1971
1972 error = decode_inline_filename3(xdr, &entry->name, &entry->len);
1973 if (unlikely(error))
1974 return error;
1975
1976 entry->prev_cookie = entry->cookie;
1977 error = decode_cookie3(xdr, &entry->cookie);
1978 if (unlikely(error))
1979 return error;
1980
1981 entry->d_type = DT_UNKNOWN;
1982
1983 if (plus) {
1984 entry->fattr->valid = 0;
1985 error = decode_post_op_attr(xdr, entry->fattr);
1986 if (unlikely(error))
1987 return error;
1988 if (entry->fattr->valid & NFS_ATTR_FATTR_V3)
1989 entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);
1990
1991 if (entry->fattr->fileid != entry->ino) {
1992 entry->fattr->mounted_on_fileid = entry->ino;
1993 entry->fattr->valid |= NFS_ATTR_FATTR_MOUNTED_ON_FILEID;
1994 }
1995
1996 /* In fact, a post_op_fh3: */
1997 p = xdr_inline_decode(xdr, 4);
1998 if (unlikely(p == NULL))
1999 goto out_overflow;
2000 if (*p != xdr_zero) {
2001 error = decode_nfs_fh3(xdr, entry->fh);
2002 if (unlikely(error)) {
2003 if (error == -E2BIG)
2004 goto out_truncated;
2005 return error;
2006 }
2007 } else
2008 zero_nfs_fh3(entry->fh);
2009 }
2010
2011 return 0;
2012
2013 out_overflow:
2014 print_overflow_msg(__func__, xdr);
2015 return -EAGAIN;
2016 out_truncated:
2017 dprintk("NFS: directory entry contains invalid file handle\n");
2018 *entry = old;
2019 return -EAGAIN;
2020 }
2021
2022 /*
2023 * 3.3.16 READDIR3res
2024 *
2025 * struct dirlist3 {
2026 * entry3 *entries;
2027 * bool eof;
2028 * };
2029 *
2030 * struct READDIR3resok {
2031 * post_op_attr dir_attributes;
2032 * cookieverf3 cookieverf;
2033 * dirlist3 reply;
2034 * };
2035 *
2036 * struct READDIR3resfail {
2037 * post_op_attr dir_attributes;
2038 * };
2039 *
2040 * union READDIR3res switch (nfsstat3 status) {
2041 * case NFS3_OK:
2042 * READDIR3resok resok;
2043 * default:
2044 * READDIR3resfail resfail;
2045 * };
2046 *
2047 * Read the directory contents into the page cache, but otherwise
2048 * don't touch them. The actual decoding is done by nfs3_decode_entry()
2049 * during subsequent nfs_readdir() calls.
2050 */
2051 static int decode_dirlist3(struct xdr_stream *xdr)
2052 {
2053 return xdr_read_pages(xdr, xdr->buf->page_len);
2054 }
2055
2056 static int decode_readdir3resok(struct xdr_stream *xdr,
2057 struct nfs3_readdirres *result)
2058 {
2059 int error;
2060
2061 error = decode_post_op_attr(xdr, result->dir_attr);
2062 if (unlikely(error))
2063 goto out;
2064 /* XXX: do we need to check if result->verf != NULL ? */
2065 error = decode_cookieverf3(xdr, result->verf);
2066 if (unlikely(error))
2067 goto out;
2068 error = decode_dirlist3(xdr);
2069 out:
2070 return error;
2071 }
2072
2073 static int nfs3_xdr_dec_readdir3res(struct rpc_rqst *req,
2074 struct xdr_stream *xdr,
2075 struct nfs3_readdirres *result)
2076 {
2077 enum nfs_stat status;
2078 int error;
2079
2080 error = decode_nfsstat3(xdr, &status);
2081 if (unlikely(error))
2082 goto out;
2083 if (status != NFS3_OK)
2084 goto out_default;
2085 error = decode_readdir3resok(xdr, result);
2086 out:
2087 return error;
2088 out_default:
2089 error = decode_post_op_attr(xdr, result->dir_attr);
2090 if (unlikely(error))
2091 goto out;
2092 return nfs3_stat_to_errno(status);
2093 }
2094
2095 /*
2096 * 3.3.18 FSSTAT3res
2097 *
2098 * struct FSSTAT3resok {
2099 * post_op_attr obj_attributes;
2100 * size3 tbytes;
2101 * size3 fbytes;
2102 * size3 abytes;
2103 * size3 tfiles;
2104 * size3 ffiles;
2105 * size3 afiles;
2106 * uint32 invarsec;
2107 * };
2108 *
2109 * struct FSSTAT3resfail {
2110 * post_op_attr obj_attributes;
2111 * };
2112 *
2113 * union FSSTAT3res switch (nfsstat3 status) {
2114 * case NFS3_OK:
2115 * FSSTAT3resok resok;
2116 * default:
2117 * FSSTAT3resfail resfail;
2118 * };
2119 */
2120 static int decode_fsstat3resok(struct xdr_stream *xdr,
2121 struct nfs_fsstat *result)
2122 {
2123 __be32 *p;
2124
2125 p = xdr_inline_decode(xdr, 8 * 6 + 4);
2126 if (unlikely(p == NULL))
2127 goto out_overflow;
2128 p = xdr_decode_size3(p, &result->tbytes);
2129 p = xdr_decode_size3(p, &result->fbytes);
2130 p = xdr_decode_size3(p, &result->abytes);
2131 p = xdr_decode_size3(p, &result->tfiles);
2132 p = xdr_decode_size3(p, &result->ffiles);
2133 xdr_decode_size3(p, &result->afiles);
2134 /* ignore invarsec */
2135 return 0;
2136 out_overflow:
2137 print_overflow_msg(__func__, xdr);
2138 return -EIO;
2139 }
2140
2141 static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req,
2142 struct xdr_stream *xdr,
2143 struct nfs_fsstat *result)
2144 {
2145 enum nfs_stat status;
2146 int error;
2147
2148 error = decode_nfsstat3(xdr, &status);
2149 if (unlikely(error))
2150 goto out;
2151 error = decode_post_op_attr(xdr, result->fattr);
2152 if (unlikely(error))
2153 goto out;
2154 if (status != NFS3_OK)
2155 goto out_status;
2156 error = decode_fsstat3resok(xdr, result);
2157 out:
2158 return error;
2159 out_status:
2160 return nfs3_stat_to_errno(status);
2161 }
2162
2163 /*
2164 * 3.3.19 FSINFO3res
2165 *
2166 * struct FSINFO3resok {
2167 * post_op_attr obj_attributes;
2168 * uint32 rtmax;
2169 * uint32 rtpref;
2170 * uint32 rtmult;
2171 * uint32 wtmax;
2172 * uint32 wtpref;
2173 * uint32 wtmult;
2174 * uint32 dtpref;
2175 * size3 maxfilesize;
2176 * nfstime3 time_delta;
2177 * uint32 properties;
2178 * };
2179 *
2180 * struct FSINFO3resfail {
2181 * post_op_attr obj_attributes;
2182 * };
2183 *
2184 * union FSINFO3res switch (nfsstat3 status) {
2185 * case NFS3_OK:
2186 * FSINFO3resok resok;
2187 * default:
2188 * FSINFO3resfail resfail;
2189 * };
2190 */
2191 static int decode_fsinfo3resok(struct xdr_stream *xdr,
2192 struct nfs_fsinfo *result)
2193 {
2194 __be32 *p;
2195
2196 p = xdr_inline_decode(xdr, 4 * 7 + 8 + 8 + 4);
2197 if (unlikely(p == NULL))
2198 goto out_overflow;
2199 result->rtmax = be32_to_cpup(p++);
2200 result->rtpref = be32_to_cpup(p++);
2201 result->rtmult = be32_to_cpup(p++);
2202 result->wtmax = be32_to_cpup(p++);
2203 result->wtpref = be32_to_cpup(p++);
2204 result->wtmult = be32_to_cpup(p++);
2205 result->dtpref = be32_to_cpup(p++);
2206 p = xdr_decode_size3(p, &result->maxfilesize);
2207 xdr_decode_nfstime3(p, &result->time_delta);
2208
2209 /* ignore properties */
2210 result->lease_time = 0;
2211 return 0;
2212 out_overflow:
2213 print_overflow_msg(__func__, xdr);
2214 return -EIO;
2215 }
2216
2217 static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req,
2218 struct xdr_stream *xdr,
2219 struct nfs_fsinfo *result)
2220 {
2221 enum nfs_stat status;
2222 int error;
2223
2224 error = decode_nfsstat3(xdr, &status);
2225 if (unlikely(error))
2226 goto out;
2227 error = decode_post_op_attr(xdr, result->fattr);
2228 if (unlikely(error))
2229 goto out;
2230 if (status != NFS3_OK)
2231 goto out_status;
2232 error = decode_fsinfo3resok(xdr, result);
2233 out:
2234 return error;
2235 out_status:
2236 return nfs3_stat_to_errno(status);
2237 }
2238
2239 /*
2240 * 3.3.20 PATHCONF3res
2241 *
2242 * struct PATHCONF3resok {
2243 * post_op_attr obj_attributes;
2244 * uint32 linkmax;
2245 * uint32 name_max;
2246 * bool no_trunc;
2247 * bool chown_restricted;
2248 * bool case_insensitive;
2249 * bool case_preserving;
2250 * };
2251 *
2252 * struct PATHCONF3resfail {
2253 * post_op_attr obj_attributes;
2254 * };
2255 *
2256 * union PATHCONF3res switch (nfsstat3 status) {
2257 * case NFS3_OK:
2258 * PATHCONF3resok resok;
2259 * default:
2260 * PATHCONF3resfail resfail;
2261 * };
2262 */
2263 static int decode_pathconf3resok(struct xdr_stream *xdr,
2264 struct nfs_pathconf *result)
2265 {
2266 __be32 *p;
2267
2268 p = xdr_inline_decode(xdr, 4 * 6);
2269 if (unlikely(p == NULL))
2270 goto out_overflow;
2271 result->max_link = be32_to_cpup(p++);
2272 result->max_namelen = be32_to_cpup(p);
2273 /* ignore remaining fields */
2274 return 0;
2275 out_overflow:
2276 print_overflow_msg(__func__, xdr);
2277 return -EIO;
2278 }
2279
2280 static int nfs3_xdr_dec_pathconf3res(struct rpc_rqst *req,
2281 struct xdr_stream *xdr,
2282 struct nfs_pathconf *result)
2283 {
2284 enum nfs_stat status;
2285 int error;
2286
2287 error = decode_nfsstat3(xdr, &status);
2288 if (unlikely(error))
2289 goto out;
2290 error = decode_post_op_attr(xdr, result->fattr);
2291 if (unlikely(error))
2292 goto out;
2293 if (status != NFS3_OK)
2294 goto out_status;
2295 error = decode_pathconf3resok(xdr, result);
2296 out:
2297 return error;
2298 out_status:
2299 return nfs3_stat_to_errno(status);
2300 }
2301
2302 /*
2303 * 3.3.21 COMMIT3res
2304 *
2305 * struct COMMIT3resok {
2306 * wcc_data file_wcc;
2307 * writeverf3 verf;
2308 * };
2309 *
2310 * struct COMMIT3resfail {
2311 * wcc_data file_wcc;
2312 * };
2313 *
2314 * union COMMIT3res switch (nfsstat3 status) {
2315 * case NFS3_OK:
2316 * COMMIT3resok resok;
2317 * default:
2318 * COMMIT3resfail resfail;
2319 * };
2320 */
2321 static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req,
2322 struct xdr_stream *xdr,
2323 struct nfs_commitres *result)
2324 {
2325 enum nfs_stat status;
2326 int error;
2327
2328 error = decode_nfsstat3(xdr, &status);
2329 if (unlikely(error))
2330 goto out;
2331 error = decode_wcc_data(xdr, result->fattr);
2332 if (unlikely(error))
2333 goto out;
2334 result->op_status = status;
2335 if (status != NFS3_OK)
2336 goto out_status;
2337 error = decode_writeverf3(xdr, &result->verf->verifier);
2338 out:
2339 return error;
2340 out_status:
2341 return nfs3_stat_to_errno(status);
2342 }
2343
2344 #ifdef CONFIG_NFS_V3_ACL
2345
2346 static inline int decode_getacl3resok(struct xdr_stream *xdr,
2347 struct nfs3_getaclres *result)
2348 {
2349 struct posix_acl **acl;
2350 unsigned int *aclcnt;
2351 size_t hdrlen;
2352 int error;
2353
2354 error = decode_post_op_attr(xdr, result->fattr);
2355 if (unlikely(error))
2356 goto out;
2357 error = decode_uint32(xdr, &result->mask);
2358 if (unlikely(error))
2359 goto out;
2360 error = -EINVAL;
2361 if (result->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
2362 goto out;
2363
2364 hdrlen = xdr_stream_pos(xdr);
2365
2366 acl = NULL;
2367 if (result->mask & NFS_ACL)
2368 acl = &result->acl_access;
2369 aclcnt = NULL;
2370 if (result->mask & NFS_ACLCNT)
2371 aclcnt = &result->acl_access_count;
2372 error = nfsacl_decode(xdr->buf, hdrlen, aclcnt, acl);
2373 if (unlikely(error <= 0))
2374 goto out;
2375
2376 acl = NULL;
2377 if (result->mask & NFS_DFACL)
2378 acl = &result->acl_default;
2379 aclcnt = NULL;
2380 if (result->mask & NFS_DFACLCNT)
2381 aclcnt = &result->acl_default_count;
2382 error = nfsacl_decode(xdr->buf, hdrlen + error, aclcnt, acl);
2383 if (unlikely(error <= 0))
2384 return error;
2385 error = 0;
2386 out:
2387 return error;
2388 }
2389
2390 static int nfs3_xdr_dec_getacl3res(struct rpc_rqst *req,
2391 struct xdr_stream *xdr,
2392 struct nfs3_getaclres *result)
2393 {
2394 enum nfs_stat status;
2395 int error;
2396
2397 error = decode_nfsstat3(xdr, &status);
2398 if (unlikely(error))
2399 goto out;
2400 if (status != NFS3_OK)
2401 goto out_default;
2402 error = decode_getacl3resok(xdr, result);
2403 out:
2404 return error;
2405 out_default:
2406 return nfs3_stat_to_errno(status);
2407 }
2408
2409 static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req,
2410 struct xdr_stream *xdr,
2411 struct nfs_fattr *result)
2412 {
2413 enum nfs_stat status;
2414 int error;
2415
2416 error = decode_nfsstat3(xdr, &status);
2417 if (unlikely(error))
2418 goto out;
2419 if (status != NFS3_OK)
2420 goto out_default;
2421 error = decode_post_op_attr(xdr, result);
2422 out:
2423 return error;
2424 out_default:
2425 return nfs3_stat_to_errno(status);
2426 }
2427
2428 #endif /* CONFIG_NFS_V3_ACL */
2429
2430
2431 /*
2432 * We need to translate between nfs status return values and
2433 * the local errno values which may not be the same.
2434 */
2435 static const struct {
2436 int stat;
2437 int errno;
2438 } nfs_errtbl[] = {
2439 { NFS_OK, 0 },
2440 { NFSERR_PERM, -EPERM },
2441 { NFSERR_NOENT, -ENOENT },
2442 { NFSERR_IO, -errno_NFSERR_IO},
2443 { NFSERR_NXIO, -ENXIO },
2444 /* { NFSERR_EAGAIN, -EAGAIN }, */
2445 { NFSERR_ACCES, -EACCES },
2446 { NFSERR_EXIST, -EEXIST },
2447 { NFSERR_XDEV, -EXDEV },
2448 { NFSERR_NODEV, -ENODEV },
2449 { NFSERR_NOTDIR, -ENOTDIR },
2450 { NFSERR_ISDIR, -EISDIR },
2451 { NFSERR_INVAL, -EINVAL },
2452 { NFSERR_FBIG, -EFBIG },
2453 { NFSERR_NOSPC, -ENOSPC },
2454 { NFSERR_ROFS, -EROFS },
2455 { NFSERR_MLINK, -EMLINK },
2456 { NFSERR_NAMETOOLONG, -ENAMETOOLONG },
2457 { NFSERR_NOTEMPTY, -ENOTEMPTY },
2458 { NFSERR_DQUOT, -EDQUOT },
2459 { NFSERR_STALE, -ESTALE },
2460 { NFSERR_REMOTE, -EREMOTE },
2461 #ifdef EWFLUSH
2462 { NFSERR_WFLUSH, -EWFLUSH },
2463 #endif
2464 { NFSERR_BADHANDLE, -EBADHANDLE },
2465 { NFSERR_NOT_SYNC, -ENOTSYNC },
2466 { NFSERR_BAD_COOKIE, -EBADCOOKIE },
2467 { NFSERR_NOTSUPP, -ENOTSUPP },
2468 { NFSERR_TOOSMALL, -ETOOSMALL },
2469 { NFSERR_SERVERFAULT, -EREMOTEIO },
2470 { NFSERR_BADTYPE, -EBADTYPE },
2471 { NFSERR_JUKEBOX, -EJUKEBOX },
2472 { -1, -EIO }
2473 };
2474
2475 /**
2476 * nfs3_stat_to_errno - convert an NFS status code to a local errno
2477 * @status: NFS status code to convert
2478 *
2479 * Returns a local errno value, or -EIO if the NFS status code is
2480 * not recognized. This function is used jointly by NFSv2 and NFSv3.
2481 */
2482 static int nfs3_stat_to_errno(enum nfs_stat status)
2483 {
2484 int i;
2485
2486 for (i = 0; nfs_errtbl[i].stat != -1; i++) {
2487 if (nfs_errtbl[i].stat == (int)status)
2488 return nfs_errtbl[i].errno;
2489 }
2490 dprintk("NFS: Unrecognized nfs status value: %u\n", status);
2491 return nfs_errtbl[i].errno;
2492 }
2493
2494
2495 #define PROC(proc, argtype, restype, timer) \
2496 [NFS3PROC_##proc] = { \
2497 .p_proc = NFS3PROC_##proc, \
2498 .p_encode = (kxdreproc_t)nfs3_xdr_enc_##argtype##3args, \
2499 .p_decode = (kxdrdproc_t)nfs3_xdr_dec_##restype##3res, \
2500 .p_arglen = NFS3_##argtype##args_sz, \
2501 .p_replen = NFS3_##restype##res_sz, \
2502 .p_timer = timer, \
2503 .p_statidx = NFS3PROC_##proc, \
2504 .p_name = #proc, \
2505 }
2506
2507 struct rpc_procinfo nfs3_procedures[] = {
2508 PROC(GETATTR, getattr, getattr, 1),
2509 PROC(SETATTR, setattr, setattr, 0),
2510 PROC(LOOKUP, lookup, lookup, 2),
2511 PROC(ACCESS, access, access, 1),
2512 PROC(READLINK, readlink, readlink, 3),
2513 PROC(READ, read, read, 3),
2514 PROC(WRITE, write, write, 4),
2515 PROC(CREATE, create, create, 0),
2516 PROC(MKDIR, mkdir, create, 0),
2517 PROC(SYMLINK, symlink, create, 0),
2518 PROC(MKNOD, mknod, create, 0),
2519 PROC(REMOVE, remove, remove, 0),
2520 PROC(RMDIR, lookup, setattr, 0),
2521 PROC(RENAME, rename, rename, 0),
2522 PROC(LINK, link, link, 0),
2523 PROC(READDIR, readdir, readdir, 3),
2524 PROC(READDIRPLUS, readdirplus, readdir, 3),
2525 PROC(FSSTAT, getattr, fsstat, 0),
2526 PROC(FSINFO, getattr, fsinfo, 0),
2527 PROC(PATHCONF, getattr, pathconf, 0),
2528 PROC(COMMIT, commit, commit, 5),
2529 };
2530
2531 const struct rpc_version nfs_version3 = {
2532 .number = 3,
2533 .nrprocs = ARRAY_SIZE(nfs3_procedures),
2534 .procs = nfs3_procedures
2535 };
2536
2537 #ifdef CONFIG_NFS_V3_ACL
2538 static struct rpc_procinfo nfs3_acl_procedures[] = {
2539 [ACLPROC3_GETACL] = {
2540 .p_proc = ACLPROC3_GETACL,
2541 .p_encode = (kxdreproc_t)nfs3_xdr_enc_getacl3args,
2542 .p_decode = (kxdrdproc_t)nfs3_xdr_dec_getacl3res,
2543 .p_arglen = ACL3_getaclargs_sz,
2544 .p_replen = ACL3_getaclres_sz,
2545 .p_timer = 1,
2546 .p_name = "GETACL",
2547 },
2548 [ACLPROC3_SETACL] = {
2549 .p_proc = ACLPROC3_SETACL,
2550 .p_encode = (kxdreproc_t)nfs3_xdr_enc_setacl3args,
2551 .p_decode = (kxdrdproc_t)nfs3_xdr_dec_setacl3res,
2552 .p_arglen = ACL3_setaclargs_sz,
2553 .p_replen = ACL3_setaclres_sz,
2554 .p_timer = 0,
2555 .p_name = "SETACL",
2556 },
2557 };
2558
2559 const struct rpc_version nfsacl_version3 = {
2560 .number = 3,
2561 .nrprocs = sizeof(nfs3_acl_procedures)/
2562 sizeof(nfs3_acl_procedures[0]),
2563 .procs = nfs3_acl_procedures,
2564 };
2565 #endif /* CONFIG_NFS_V3_ACL */
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