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NFSv3: Use the readdir fileid as the mounted-on-fileid
[mirror_ubuntu-artful-kernel.git] / fs / nfs / nfs3xdr.c
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 }
1107
1108 /*
1109 * 3.3.11 MKNOD3args
1110 *
1111 * struct devicedata3 {
1112 * sattr3 dev_attributes;
1113 * specdata3 spec;
1114 * };
1115 *
1116 * union mknoddata3 switch (ftype3 type) {
1117 * case NF3CHR:
1118 * case NF3BLK:
1119 * devicedata3 device;
1120 * case NF3SOCK:
1121 * case NF3FIFO:
1122 * sattr3 pipe_attributes;
1123 * default:
1124 * void;
1125 * };
1126 *
1127 * struct MKNOD3args {
1128 * diropargs3 where;
1129 * mknoddata3 what;
1130 * };
1131 */
1132 static void encode_devicedata3(struct xdr_stream *xdr,
1133 const struct nfs3_mknodargs *args)
1134 {
1135 encode_sattr3(xdr, args->sattr);
1136 encode_specdata3(xdr, args->rdev);
1137 }
1138
1139 static void encode_mknoddata3(struct xdr_stream *xdr,
1140 const struct nfs3_mknodargs *args)
1141 {
1142 encode_ftype3(xdr, args->type);
1143 switch (args->type) {
1144 case NF3CHR:
1145 case NF3BLK:
1146 encode_devicedata3(xdr, args);
1147 break;
1148 case NF3SOCK:
1149 case NF3FIFO:
1150 encode_sattr3(xdr, args->sattr);
1151 break;
1152 case NF3REG:
1153 case NF3DIR:
1154 break;
1155 default:
1156 BUG();
1157 }
1158 }
1159
1160 static void nfs3_xdr_enc_mknod3args(struct rpc_rqst *req,
1161 struct xdr_stream *xdr,
1162 const struct nfs3_mknodargs *args)
1163 {
1164 encode_diropargs3(xdr, args->fh, args->name, args->len);
1165 encode_mknoddata3(xdr, args);
1166 }
1167
1168 /*
1169 * 3.3.12 REMOVE3args
1170 *
1171 * struct REMOVE3args {
1172 * diropargs3 object;
1173 * };
1174 */
1175 static void nfs3_xdr_enc_remove3args(struct rpc_rqst *req,
1176 struct xdr_stream *xdr,
1177 const struct nfs_removeargs *args)
1178 {
1179 encode_diropargs3(xdr, args->fh, args->name.name, args->name.len);
1180 }
1181
1182 /*
1183 * 3.3.14 RENAME3args
1184 *
1185 * struct RENAME3args {
1186 * diropargs3 from;
1187 * diropargs3 to;
1188 * };
1189 */
1190 static void nfs3_xdr_enc_rename3args(struct rpc_rqst *req,
1191 struct xdr_stream *xdr,
1192 const struct nfs_renameargs *args)
1193 {
1194 const struct qstr *old = args->old_name;
1195 const struct qstr *new = args->new_name;
1196
1197 encode_diropargs3(xdr, args->old_dir, old->name, old->len);
1198 encode_diropargs3(xdr, args->new_dir, new->name, new->len);
1199 }
1200
1201 /*
1202 * 3.3.15 LINK3args
1203 *
1204 * struct LINK3args {
1205 * nfs_fh3 file;
1206 * diropargs3 link;
1207 * };
1208 */
1209 static void nfs3_xdr_enc_link3args(struct rpc_rqst *req,
1210 struct xdr_stream *xdr,
1211 const struct nfs3_linkargs *args)
1212 {
1213 encode_nfs_fh3(xdr, args->fromfh);
1214 encode_diropargs3(xdr, args->tofh, args->toname, args->tolen);
1215 }
1216
1217 /*
1218 * 3.3.16 READDIR3args
1219 *
1220 * struct READDIR3args {
1221 * nfs_fh3 dir;
1222 * cookie3 cookie;
1223 * cookieverf3 cookieverf;
1224 * count3 count;
1225 * };
1226 */
1227 static void encode_readdir3args(struct xdr_stream *xdr,
1228 const struct nfs3_readdirargs *args)
1229 {
1230 __be32 *p;
1231
1232 encode_nfs_fh3(xdr, args->fh);
1233
1234 p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4);
1235 p = xdr_encode_cookie3(p, args->cookie);
1236 p = xdr_encode_cookieverf3(p, args->verf);
1237 *p = cpu_to_be32(args->count);
1238 }
1239
1240 static void nfs3_xdr_enc_readdir3args(struct rpc_rqst *req,
1241 struct xdr_stream *xdr,
1242 const struct nfs3_readdirargs *args)
1243 {
1244 encode_readdir3args(xdr, args);
1245 prepare_reply_buffer(req, args->pages, 0,
1246 args->count, NFS3_readdirres_sz);
1247 }
1248
1249 /*
1250 * 3.3.17 READDIRPLUS3args
1251 *
1252 * struct READDIRPLUS3args {
1253 * nfs_fh3 dir;
1254 * cookie3 cookie;
1255 * cookieverf3 cookieverf;
1256 * count3 dircount;
1257 * count3 maxcount;
1258 * };
1259 */
1260 static void encode_readdirplus3args(struct xdr_stream *xdr,
1261 const struct nfs3_readdirargs *args)
1262 {
1263 __be32 *p;
1264
1265 encode_nfs_fh3(xdr, args->fh);
1266
1267 p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4 + 4);
1268 p = xdr_encode_cookie3(p, args->cookie);
1269 p = xdr_encode_cookieverf3(p, args->verf);
1270
1271 /*
1272 * readdirplus: need dircount + buffer size.
1273 * We just make sure we make dircount big enough
1274 */
1275 *p++ = cpu_to_be32(args->count >> 3);
1276
1277 *p = cpu_to_be32(args->count);
1278 }
1279
1280 static void nfs3_xdr_enc_readdirplus3args(struct rpc_rqst *req,
1281 struct xdr_stream *xdr,
1282 const struct nfs3_readdirargs *args)
1283 {
1284 encode_readdirplus3args(xdr, args);
1285 prepare_reply_buffer(req, args->pages, 0,
1286 args->count, NFS3_readdirres_sz);
1287 }
1288
1289 /*
1290 * 3.3.21 COMMIT3args
1291 *
1292 * struct COMMIT3args {
1293 * nfs_fh3 file;
1294 * offset3 offset;
1295 * count3 count;
1296 * };
1297 */
1298 static void encode_commit3args(struct xdr_stream *xdr,
1299 const struct nfs_commitargs *args)
1300 {
1301 __be32 *p;
1302
1303 encode_nfs_fh3(xdr, args->fh);
1304
1305 p = xdr_reserve_space(xdr, 8 + 4);
1306 p = xdr_encode_hyper(p, args->offset);
1307 *p = cpu_to_be32(args->count);
1308 }
1309
1310 static void nfs3_xdr_enc_commit3args(struct rpc_rqst *req,
1311 struct xdr_stream *xdr,
1312 const struct nfs_commitargs *args)
1313 {
1314 encode_commit3args(xdr, args);
1315 }
1316
1317 #ifdef CONFIG_NFS_V3_ACL
1318
1319 static void nfs3_xdr_enc_getacl3args(struct rpc_rqst *req,
1320 struct xdr_stream *xdr,
1321 const struct nfs3_getaclargs *args)
1322 {
1323 encode_nfs_fh3(xdr, args->fh);
1324 encode_uint32(xdr, args->mask);
1325 if (args->mask & (NFS_ACL | NFS_DFACL))
1326 prepare_reply_buffer(req, args->pages, 0,
1327 NFSACL_MAXPAGES << PAGE_SHIFT,
1328 ACL3_getaclres_sz);
1329 }
1330
1331 static void nfs3_xdr_enc_setacl3args(struct rpc_rqst *req,
1332 struct xdr_stream *xdr,
1333 const struct nfs3_setaclargs *args)
1334 {
1335 unsigned int base;
1336 int error;
1337
1338 encode_nfs_fh3(xdr, NFS_FH(args->inode));
1339 encode_uint32(xdr, args->mask);
1340
1341 base = req->rq_slen;
1342 if (args->npages != 0)
1343 xdr_write_pages(xdr, args->pages, 0, args->len);
1344 else
1345 xdr_reserve_space(xdr, NFS_ACL_INLINE_BUFSIZE);
1346
1347 error = nfsacl_encode(xdr->buf, base, args->inode,
1348 (args->mask & NFS_ACL) ?
1349 args->acl_access : NULL, 1, 0);
1350 /* FIXME: this is just broken */
1351 BUG_ON(error < 0);
1352 error = nfsacl_encode(xdr->buf, base + error, args->inode,
1353 (args->mask & NFS_DFACL) ?
1354 args->acl_default : NULL, 1,
1355 NFS_ACL_DEFAULT);
1356 BUG_ON(error < 0);
1357 }
1358
1359 #endif /* CONFIG_NFS_V3_ACL */
1360
1361 /*
1362 * NFSv3 XDR decode functions
1363 *
1364 * NFSv3 result types are defined in section 3.3 of RFC 1813:
1365 * "NFS Version 3 Protocol Specification".
1366 */
1367
1368 /*
1369 * 3.3.1 GETATTR3res
1370 *
1371 * struct GETATTR3resok {
1372 * fattr3 obj_attributes;
1373 * };
1374 *
1375 * union GETATTR3res switch (nfsstat3 status) {
1376 * case NFS3_OK:
1377 * GETATTR3resok resok;
1378 * default:
1379 * void;
1380 * };
1381 */
1382 static int nfs3_xdr_dec_getattr3res(struct rpc_rqst *req,
1383 struct xdr_stream *xdr,
1384 struct nfs_fattr *result)
1385 {
1386 enum nfs_stat status;
1387 int error;
1388
1389 error = decode_nfsstat3(xdr, &status);
1390 if (unlikely(error))
1391 goto out;
1392 if (status != NFS3_OK)
1393 goto out_default;
1394 error = decode_fattr3(xdr, result);
1395 out:
1396 return error;
1397 out_default:
1398 return nfs3_stat_to_errno(status);
1399 }
1400
1401 /*
1402 * 3.3.2 SETATTR3res
1403 *
1404 * struct SETATTR3resok {
1405 * wcc_data obj_wcc;
1406 * };
1407 *
1408 * struct SETATTR3resfail {
1409 * wcc_data obj_wcc;
1410 * };
1411 *
1412 * union SETATTR3res switch (nfsstat3 status) {
1413 * case NFS3_OK:
1414 * SETATTR3resok resok;
1415 * default:
1416 * SETATTR3resfail resfail;
1417 * };
1418 */
1419 static int nfs3_xdr_dec_setattr3res(struct rpc_rqst *req,
1420 struct xdr_stream *xdr,
1421 struct nfs_fattr *result)
1422 {
1423 enum nfs_stat status;
1424 int error;
1425
1426 error = decode_nfsstat3(xdr, &status);
1427 if (unlikely(error))
1428 goto out;
1429 error = decode_wcc_data(xdr, result);
1430 if (unlikely(error))
1431 goto out;
1432 if (status != NFS3_OK)
1433 goto out_status;
1434 out:
1435 return error;
1436 out_status:
1437 return nfs3_stat_to_errno(status);
1438 }
1439
1440 /*
1441 * 3.3.3 LOOKUP3res
1442 *
1443 * struct LOOKUP3resok {
1444 * nfs_fh3 object;
1445 * post_op_attr obj_attributes;
1446 * post_op_attr dir_attributes;
1447 * };
1448 *
1449 * struct LOOKUP3resfail {
1450 * post_op_attr dir_attributes;
1451 * };
1452 *
1453 * union LOOKUP3res switch (nfsstat3 status) {
1454 * case NFS3_OK:
1455 * LOOKUP3resok resok;
1456 * default:
1457 * LOOKUP3resfail resfail;
1458 * };
1459 */
1460 static int nfs3_xdr_dec_lookup3res(struct rpc_rqst *req,
1461 struct xdr_stream *xdr,
1462 struct nfs3_diropres *result)
1463 {
1464 enum nfs_stat status;
1465 int error;
1466
1467 error = decode_nfsstat3(xdr, &status);
1468 if (unlikely(error))
1469 goto out;
1470 if (status != NFS3_OK)
1471 goto out_default;
1472 error = decode_nfs_fh3(xdr, result->fh);
1473 if (unlikely(error))
1474 goto out;
1475 error = decode_post_op_attr(xdr, result->fattr);
1476 if (unlikely(error))
1477 goto out;
1478 error = decode_post_op_attr(xdr, result->dir_attr);
1479 out:
1480 return error;
1481 out_default:
1482 error = decode_post_op_attr(xdr, result->dir_attr);
1483 if (unlikely(error))
1484 goto out;
1485 return nfs3_stat_to_errno(status);
1486 }
1487
1488 /*
1489 * 3.3.4 ACCESS3res
1490 *
1491 * struct ACCESS3resok {
1492 * post_op_attr obj_attributes;
1493 * uint32 access;
1494 * };
1495 *
1496 * struct ACCESS3resfail {
1497 * post_op_attr obj_attributes;
1498 * };
1499 *
1500 * union ACCESS3res switch (nfsstat3 status) {
1501 * case NFS3_OK:
1502 * ACCESS3resok resok;
1503 * default:
1504 * ACCESS3resfail resfail;
1505 * };
1506 */
1507 static int nfs3_xdr_dec_access3res(struct rpc_rqst *req,
1508 struct xdr_stream *xdr,
1509 struct nfs3_accessres *result)
1510 {
1511 enum nfs_stat status;
1512 int error;
1513
1514 error = decode_nfsstat3(xdr, &status);
1515 if (unlikely(error))
1516 goto out;
1517 error = decode_post_op_attr(xdr, result->fattr);
1518 if (unlikely(error))
1519 goto out;
1520 if (status != NFS3_OK)
1521 goto out_default;
1522 error = decode_uint32(xdr, &result->access);
1523 out:
1524 return error;
1525 out_default:
1526 return nfs3_stat_to_errno(status);
1527 }
1528
1529 /*
1530 * 3.3.5 READLINK3res
1531 *
1532 * struct READLINK3resok {
1533 * post_op_attr symlink_attributes;
1534 * nfspath3 data;
1535 * };
1536 *
1537 * struct READLINK3resfail {
1538 * post_op_attr symlink_attributes;
1539 * };
1540 *
1541 * union READLINK3res switch (nfsstat3 status) {
1542 * case NFS3_OK:
1543 * READLINK3resok resok;
1544 * default:
1545 * READLINK3resfail resfail;
1546 * };
1547 */
1548 static int nfs3_xdr_dec_readlink3res(struct rpc_rqst *req,
1549 struct xdr_stream *xdr,
1550 struct nfs_fattr *result)
1551 {
1552 enum nfs_stat status;
1553 int error;
1554
1555 error = decode_nfsstat3(xdr, &status);
1556 if (unlikely(error))
1557 goto out;
1558 error = decode_post_op_attr(xdr, result);
1559 if (unlikely(error))
1560 goto out;
1561 if (status != NFS3_OK)
1562 goto out_default;
1563 error = decode_nfspath3(xdr);
1564 out:
1565 return error;
1566 out_default:
1567 return nfs3_stat_to_errno(status);
1568 }
1569
1570 /*
1571 * 3.3.6 READ3res
1572 *
1573 * struct READ3resok {
1574 * post_op_attr file_attributes;
1575 * count3 count;
1576 * bool eof;
1577 * opaque data<>;
1578 * };
1579 *
1580 * struct READ3resfail {
1581 * post_op_attr file_attributes;
1582 * };
1583 *
1584 * union READ3res switch (nfsstat3 status) {
1585 * case NFS3_OK:
1586 * READ3resok resok;
1587 * default:
1588 * READ3resfail resfail;
1589 * };
1590 */
1591 static int decode_read3resok(struct xdr_stream *xdr,
1592 struct nfs_pgio_res *result)
1593 {
1594 u32 eof, count, ocount, recvd;
1595 __be32 *p;
1596
1597 p = xdr_inline_decode(xdr, 4 + 4 + 4);
1598 if (unlikely(p == NULL))
1599 goto out_overflow;
1600 count = be32_to_cpup(p++);
1601 eof = be32_to_cpup(p++);
1602 ocount = be32_to_cpup(p++);
1603 if (unlikely(ocount != count))
1604 goto out_mismatch;
1605 recvd = xdr_read_pages(xdr, count);
1606 if (unlikely(count > recvd))
1607 goto out_cheating;
1608 out:
1609 result->eof = eof;
1610 result->count = count;
1611 return count;
1612 out_mismatch:
1613 dprintk("NFS: READ count doesn't match length of opaque: "
1614 "count %u != ocount %u\n", count, ocount);
1615 return -EIO;
1616 out_cheating:
1617 dprintk("NFS: server cheating in read result: "
1618 "count %u > recvd %u\n", count, recvd);
1619 count = recvd;
1620 eof = 0;
1621 goto out;
1622 out_overflow:
1623 print_overflow_msg(__func__, xdr);
1624 return -EIO;
1625 }
1626
1627 static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1628 struct nfs_pgio_res *result)
1629 {
1630 enum nfs_stat status;
1631 int error;
1632
1633 error = decode_nfsstat3(xdr, &status);
1634 if (unlikely(error))
1635 goto out;
1636 error = decode_post_op_attr(xdr, result->fattr);
1637 if (unlikely(error))
1638 goto out;
1639 result->op_status = status;
1640 if (status != NFS3_OK)
1641 goto out_status;
1642 error = decode_read3resok(xdr, result);
1643 out:
1644 return error;
1645 out_status:
1646 return nfs3_stat_to_errno(status);
1647 }
1648
1649 /*
1650 * 3.3.7 WRITE3res
1651 *
1652 * enum stable_how {
1653 * UNSTABLE = 0,
1654 * DATA_SYNC = 1,
1655 * FILE_SYNC = 2
1656 * };
1657 *
1658 * struct WRITE3resok {
1659 * wcc_data file_wcc;
1660 * count3 count;
1661 * stable_how committed;
1662 * writeverf3 verf;
1663 * };
1664 *
1665 * struct WRITE3resfail {
1666 * wcc_data file_wcc;
1667 * };
1668 *
1669 * union WRITE3res switch (nfsstat3 status) {
1670 * case NFS3_OK:
1671 * WRITE3resok resok;
1672 * default:
1673 * WRITE3resfail resfail;
1674 * };
1675 */
1676 static int decode_write3resok(struct xdr_stream *xdr,
1677 struct nfs_pgio_res *result)
1678 {
1679 __be32 *p;
1680
1681 p = xdr_inline_decode(xdr, 4 + 4);
1682 if (unlikely(p == NULL))
1683 goto out_overflow;
1684 result->count = be32_to_cpup(p++);
1685 result->verf->committed = be32_to_cpup(p++);
1686 if (unlikely(result->verf->committed > NFS_FILE_SYNC))
1687 goto out_badvalue;
1688 if (decode_writeverf3(xdr, &result->verf->verifier))
1689 goto out_eio;
1690 return result->count;
1691 out_badvalue:
1692 dprintk("NFS: bad stable_how value: %u\n", result->verf->committed);
1693 return -EIO;
1694 out_overflow:
1695 print_overflow_msg(__func__, xdr);
1696 out_eio:
1697 return -EIO;
1698 }
1699
1700 static int nfs3_xdr_dec_write3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1701 struct nfs_pgio_res *result)
1702 {
1703 enum nfs_stat status;
1704 int error;
1705
1706 error = decode_nfsstat3(xdr, &status);
1707 if (unlikely(error))
1708 goto out;
1709 error = decode_wcc_data(xdr, result->fattr);
1710 if (unlikely(error))
1711 goto out;
1712 result->op_status = status;
1713 if (status != NFS3_OK)
1714 goto out_status;
1715 error = decode_write3resok(xdr, result);
1716 out:
1717 return error;
1718 out_status:
1719 return nfs3_stat_to_errno(status);
1720 }
1721
1722 /*
1723 * 3.3.8 CREATE3res
1724 *
1725 * struct CREATE3resok {
1726 * post_op_fh3 obj;
1727 * post_op_attr obj_attributes;
1728 * wcc_data dir_wcc;
1729 * };
1730 *
1731 * struct CREATE3resfail {
1732 * wcc_data dir_wcc;
1733 * };
1734 *
1735 * union CREATE3res switch (nfsstat3 status) {
1736 * case NFS3_OK:
1737 * CREATE3resok resok;
1738 * default:
1739 * CREATE3resfail resfail;
1740 * };
1741 */
1742 static int decode_create3resok(struct xdr_stream *xdr,
1743 struct nfs3_diropres *result)
1744 {
1745 int error;
1746
1747 error = decode_post_op_fh3(xdr, result->fh);
1748 if (unlikely(error))
1749 goto out;
1750 error = decode_post_op_attr(xdr, result->fattr);
1751 if (unlikely(error))
1752 goto out;
1753 /* The server isn't required to return a file handle.
1754 * If it didn't, force the client to perform a LOOKUP
1755 * to determine the correct file handle and attribute
1756 * values for the new object. */
1757 if (result->fh->size == 0)
1758 result->fattr->valid = 0;
1759 error = decode_wcc_data(xdr, result->dir_attr);
1760 out:
1761 return error;
1762 }
1763
1764 static int nfs3_xdr_dec_create3res(struct rpc_rqst *req,
1765 struct xdr_stream *xdr,
1766 struct nfs3_diropres *result)
1767 {
1768 enum nfs_stat status;
1769 int error;
1770
1771 error = decode_nfsstat3(xdr, &status);
1772 if (unlikely(error))
1773 goto out;
1774 if (status != NFS3_OK)
1775 goto out_default;
1776 error = decode_create3resok(xdr, result);
1777 out:
1778 return error;
1779 out_default:
1780 error = decode_wcc_data(xdr, result->dir_attr);
1781 if (unlikely(error))
1782 goto out;
1783 return nfs3_stat_to_errno(status);
1784 }
1785
1786 /*
1787 * 3.3.12 REMOVE3res
1788 *
1789 * struct REMOVE3resok {
1790 * wcc_data dir_wcc;
1791 * };
1792 *
1793 * struct REMOVE3resfail {
1794 * wcc_data dir_wcc;
1795 * };
1796 *
1797 * union REMOVE3res switch (nfsstat3 status) {
1798 * case NFS3_OK:
1799 * REMOVE3resok resok;
1800 * default:
1801 * REMOVE3resfail resfail;
1802 * };
1803 */
1804 static int nfs3_xdr_dec_remove3res(struct rpc_rqst *req,
1805 struct xdr_stream *xdr,
1806 struct nfs_removeres *result)
1807 {
1808 enum nfs_stat status;
1809 int error;
1810
1811 error = decode_nfsstat3(xdr, &status);
1812 if (unlikely(error))
1813 goto out;
1814 error = decode_wcc_data(xdr, result->dir_attr);
1815 if (unlikely(error))
1816 goto out;
1817 if (status != NFS3_OK)
1818 goto out_status;
1819 out:
1820 return error;
1821 out_status:
1822 return nfs3_stat_to_errno(status);
1823 }
1824
1825 /*
1826 * 3.3.14 RENAME3res
1827 *
1828 * struct RENAME3resok {
1829 * wcc_data fromdir_wcc;
1830 * wcc_data todir_wcc;
1831 * };
1832 *
1833 * struct RENAME3resfail {
1834 * wcc_data fromdir_wcc;
1835 * wcc_data todir_wcc;
1836 * };
1837 *
1838 * union RENAME3res switch (nfsstat3 status) {
1839 * case NFS3_OK:
1840 * RENAME3resok resok;
1841 * default:
1842 * RENAME3resfail resfail;
1843 * };
1844 */
1845 static int nfs3_xdr_dec_rename3res(struct rpc_rqst *req,
1846 struct xdr_stream *xdr,
1847 struct nfs_renameres *result)
1848 {
1849 enum nfs_stat status;
1850 int error;
1851
1852 error = decode_nfsstat3(xdr, &status);
1853 if (unlikely(error))
1854 goto out;
1855 error = decode_wcc_data(xdr, result->old_fattr);
1856 if (unlikely(error))
1857 goto out;
1858 error = decode_wcc_data(xdr, result->new_fattr);
1859 if (unlikely(error))
1860 goto out;
1861 if (status != NFS3_OK)
1862 goto out_status;
1863 out:
1864 return error;
1865 out_status:
1866 return nfs3_stat_to_errno(status);
1867 }
1868
1869 /*
1870 * 3.3.15 LINK3res
1871 *
1872 * struct LINK3resok {
1873 * post_op_attr file_attributes;
1874 * wcc_data linkdir_wcc;
1875 * };
1876 *
1877 * struct LINK3resfail {
1878 * post_op_attr file_attributes;
1879 * wcc_data linkdir_wcc;
1880 * };
1881 *
1882 * union LINK3res switch (nfsstat3 status) {
1883 * case NFS3_OK:
1884 * LINK3resok resok;
1885 * default:
1886 * LINK3resfail resfail;
1887 * };
1888 */
1889 static int nfs3_xdr_dec_link3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1890 struct nfs3_linkres *result)
1891 {
1892 enum nfs_stat status;
1893 int error;
1894
1895 error = decode_nfsstat3(xdr, &status);
1896 if (unlikely(error))
1897 goto out;
1898 error = decode_post_op_attr(xdr, result->fattr);
1899 if (unlikely(error))
1900 goto out;
1901 error = decode_wcc_data(xdr, result->dir_attr);
1902 if (unlikely(error))
1903 goto out;
1904 if (status != NFS3_OK)
1905 goto out_status;
1906 out:
1907 return error;
1908 out_status:
1909 return nfs3_stat_to_errno(status);
1910 }
1911
1912 /**
1913 * nfs3_decode_dirent - Decode a single NFSv3 directory entry stored in
1914 * the local page cache
1915 * @xdr: XDR stream where entry resides
1916 * @entry: buffer to fill in with entry data
1917 * @plus: boolean indicating whether this should be a readdirplus entry
1918 *
1919 * Returns zero if successful, otherwise a negative errno value is
1920 * returned.
1921 *
1922 * This function is not invoked during READDIR reply decoding, but
1923 * rather whenever an application invokes the getdents(2) system call
1924 * on a directory already in our cache.
1925 *
1926 * 3.3.16 entry3
1927 *
1928 * struct entry3 {
1929 * fileid3 fileid;
1930 * filename3 name;
1931 * cookie3 cookie;
1932 * fhandle3 filehandle;
1933 * post_op_attr3 attributes;
1934 * entry3 *nextentry;
1935 * };
1936 *
1937 * 3.3.17 entryplus3
1938 * struct entryplus3 {
1939 * fileid3 fileid;
1940 * filename3 name;
1941 * cookie3 cookie;
1942 * post_op_attr name_attributes;
1943 * post_op_fh3 name_handle;
1944 * entryplus3 *nextentry;
1945 * };
1946 */
1947 int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
1948 int plus)
1949 {
1950 struct nfs_entry old = *entry;
1951 __be32 *p;
1952 int error;
1953
1954 p = xdr_inline_decode(xdr, 4);
1955 if (unlikely(p == NULL))
1956 goto out_overflow;
1957 if (*p == xdr_zero) {
1958 p = xdr_inline_decode(xdr, 4);
1959 if (unlikely(p == NULL))
1960 goto out_overflow;
1961 if (*p == xdr_zero)
1962 return -EAGAIN;
1963 entry->eof = 1;
1964 return -EBADCOOKIE;
1965 }
1966
1967 error = decode_fileid3(xdr, &entry->ino);
1968 if (unlikely(error))
1969 return error;
1970
1971 error = decode_inline_filename3(xdr, &entry->name, &entry->len);
1972 if (unlikely(error))
1973 return error;
1974
1975 entry->prev_cookie = entry->cookie;
1976 error = decode_cookie3(xdr, &entry->cookie);
1977 if (unlikely(error))
1978 return error;
1979
1980 entry->d_type = DT_UNKNOWN;
1981
1982 if (plus) {
1983 entry->fattr->valid = 0;
1984 error = decode_post_op_attr(xdr, entry->fattr);
1985 if (unlikely(error))
1986 return error;
1987 if (entry->fattr->valid & NFS_ATTR_FATTR_V3)
1988 entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);
1989
1990 if (entry->fattr->fileid != entry->ino) {
1991 entry->fattr->mounted_on_fileid = entry->ino;
1992 entry->fattr->valid |= NFS_ATTR_FATTR_MOUNTED_ON_FILEID;
1993 }
1994
1995 /* In fact, a post_op_fh3: */
1996 p = xdr_inline_decode(xdr, 4);
1997 if (unlikely(p == NULL))
1998 goto out_overflow;
1999 if (*p != xdr_zero) {
2000 error = decode_nfs_fh3(xdr, entry->fh);
2001 if (unlikely(error)) {
2002 if (error == -E2BIG)
2003 goto out_truncated;
2004 return error;
2005 }
2006 } else
2007 zero_nfs_fh3(entry->fh);
2008 }
2009
2010 return 0;
2011
2012 out_overflow:
2013 print_overflow_msg(__func__, xdr);
2014 return -EAGAIN;
2015 out_truncated:
2016 dprintk("NFS: directory entry contains invalid file handle\n");
2017 *entry = old;
2018 return -EAGAIN;
2019 }
2020
2021 /*
2022 * 3.3.16 READDIR3res
2023 *
2024 * struct dirlist3 {
2025 * entry3 *entries;
2026 * bool eof;
2027 * };
2028 *
2029 * struct READDIR3resok {
2030 * post_op_attr dir_attributes;
2031 * cookieverf3 cookieverf;
2032 * dirlist3 reply;
2033 * };
2034 *
2035 * struct READDIR3resfail {
2036 * post_op_attr dir_attributes;
2037 * };
2038 *
2039 * union READDIR3res switch (nfsstat3 status) {
2040 * case NFS3_OK:
2041 * READDIR3resok resok;
2042 * default:
2043 * READDIR3resfail resfail;
2044 * };
2045 *
2046 * Read the directory contents into the page cache, but otherwise
2047 * don't touch them. The actual decoding is done by nfs3_decode_entry()
2048 * during subsequent nfs_readdir() calls.
2049 */
2050 static int decode_dirlist3(struct xdr_stream *xdr)
2051 {
2052 return xdr_read_pages(xdr, xdr->buf->page_len);
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 nfs3_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 nfs3_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 nfs3_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 nfs3_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_commitres *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 result->op_status = status;
2334 if (status != NFS3_OK)
2335 goto out_status;
2336 error = decode_writeverf3(xdr, &result->verf->verifier);
2337 out:
2338 return error;
2339 out_status:
2340 return nfs3_stat_to_errno(status);
2341 }
2342
2343 #ifdef CONFIG_NFS_V3_ACL
2344
2345 static inline int decode_getacl3resok(struct xdr_stream *xdr,
2346 struct nfs3_getaclres *result)
2347 {
2348 struct posix_acl **acl;
2349 unsigned int *aclcnt;
2350 size_t hdrlen;
2351 int error;
2352
2353 error = decode_post_op_attr(xdr, result->fattr);
2354 if (unlikely(error))
2355 goto out;
2356 error = decode_uint32(xdr, &result->mask);
2357 if (unlikely(error))
2358 goto out;
2359 error = -EINVAL;
2360 if (result->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
2361 goto out;
2362
2363 hdrlen = xdr_stream_pos(xdr);
2364
2365 acl = NULL;
2366 if (result->mask & NFS_ACL)
2367 acl = &result->acl_access;
2368 aclcnt = NULL;
2369 if (result->mask & NFS_ACLCNT)
2370 aclcnt = &result->acl_access_count;
2371 error = nfsacl_decode(xdr->buf, hdrlen, aclcnt, acl);
2372 if (unlikely(error <= 0))
2373 goto out;
2374
2375 acl = NULL;
2376 if (result->mask & NFS_DFACL)
2377 acl = &result->acl_default;
2378 aclcnt = NULL;
2379 if (result->mask & NFS_DFACLCNT)
2380 aclcnt = &result->acl_default_count;
2381 error = nfsacl_decode(xdr->buf, hdrlen + error, aclcnt, acl);
2382 if (unlikely(error <= 0))
2383 return error;
2384 error = 0;
2385 out:
2386 return error;
2387 }
2388
2389 static int nfs3_xdr_dec_getacl3res(struct rpc_rqst *req,
2390 struct xdr_stream *xdr,
2391 struct nfs3_getaclres *result)
2392 {
2393 enum nfs_stat status;
2394 int error;
2395
2396 error = decode_nfsstat3(xdr, &status);
2397 if (unlikely(error))
2398 goto out;
2399 if (status != NFS3_OK)
2400 goto out_default;
2401 error = decode_getacl3resok(xdr, result);
2402 out:
2403 return error;
2404 out_default:
2405 return nfs3_stat_to_errno(status);
2406 }
2407
2408 static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req,
2409 struct xdr_stream *xdr,
2410 struct nfs_fattr *result)
2411 {
2412 enum nfs_stat status;
2413 int error;
2414
2415 error = decode_nfsstat3(xdr, &status);
2416 if (unlikely(error))
2417 goto out;
2418 if (status != NFS3_OK)
2419 goto out_default;
2420 error = decode_post_op_attr(xdr, result);
2421 out:
2422 return error;
2423 out_default:
2424 return nfs3_stat_to_errno(status);
2425 }
2426
2427 #endif /* CONFIG_NFS_V3_ACL */
2428
2429
2430 /*
2431 * We need to translate between nfs status return values and
2432 * the local errno values which may not be the same.
2433 */
2434 static const struct {
2435 int stat;
2436 int errno;
2437 } nfs_errtbl[] = {
2438 { NFS_OK, 0 },
2439 { NFSERR_PERM, -EPERM },
2440 { NFSERR_NOENT, -ENOENT },
2441 { NFSERR_IO, -errno_NFSERR_IO},
2442 { NFSERR_NXIO, -ENXIO },
2443 /* { NFSERR_EAGAIN, -EAGAIN }, */
2444 { NFSERR_ACCES, -EACCES },
2445 { NFSERR_EXIST, -EEXIST },
2446 { NFSERR_XDEV, -EXDEV },
2447 { NFSERR_NODEV, -ENODEV },
2448 { NFSERR_NOTDIR, -ENOTDIR },
2449 { NFSERR_ISDIR, -EISDIR },
2450 { NFSERR_INVAL, -EINVAL },
2451 { NFSERR_FBIG, -EFBIG },
2452 { NFSERR_NOSPC, -ENOSPC },
2453 { NFSERR_ROFS, -EROFS },
2454 { NFSERR_MLINK, -EMLINK },
2455 { NFSERR_NAMETOOLONG, -ENAMETOOLONG },
2456 { NFSERR_NOTEMPTY, -ENOTEMPTY },
2457 { NFSERR_DQUOT, -EDQUOT },
2458 { NFSERR_STALE, -ESTALE },
2459 { NFSERR_REMOTE, -EREMOTE },
2460 #ifdef EWFLUSH
2461 { NFSERR_WFLUSH, -EWFLUSH },
2462 #endif
2463 { NFSERR_BADHANDLE, -EBADHANDLE },
2464 { NFSERR_NOT_SYNC, -ENOTSYNC },
2465 { NFSERR_BAD_COOKIE, -EBADCOOKIE },
2466 { NFSERR_NOTSUPP, -ENOTSUPP },
2467 { NFSERR_TOOSMALL, -ETOOSMALL },
2468 { NFSERR_SERVERFAULT, -EREMOTEIO },
2469 { NFSERR_BADTYPE, -EBADTYPE },
2470 { NFSERR_JUKEBOX, -EJUKEBOX },
2471 { -1, -EIO }
2472 };
2473
2474 /**
2475 * nfs3_stat_to_errno - convert an NFS status code to a local errno
2476 * @status: NFS status code to convert
2477 *
2478 * Returns a local errno value, or -EIO if the NFS status code is
2479 * not recognized. This function is used jointly by NFSv2 and NFSv3.
2480 */
2481 static int nfs3_stat_to_errno(enum nfs_stat status)
2482 {
2483 int i;
2484
2485 for (i = 0; nfs_errtbl[i].stat != -1; i++) {
2486 if (nfs_errtbl[i].stat == (int)status)
2487 return nfs_errtbl[i].errno;
2488 }
2489 dprintk("NFS: Unrecognized nfs status value: %u\n", status);
2490 return nfs_errtbl[i].errno;
2491 }
2492
2493
2494 #define PROC(proc, argtype, restype, timer) \
2495 [NFS3PROC_##proc] = { \
2496 .p_proc = NFS3PROC_##proc, \
2497 .p_encode = (kxdreproc_t)nfs3_xdr_enc_##argtype##3args, \
2498 .p_decode = (kxdrdproc_t)nfs3_xdr_dec_##restype##3res, \
2499 .p_arglen = NFS3_##argtype##args_sz, \
2500 .p_replen = NFS3_##restype##res_sz, \
2501 .p_timer = timer, \
2502 .p_statidx = NFS3PROC_##proc, \
2503 .p_name = #proc, \
2504 }
2505
2506 struct rpc_procinfo nfs3_procedures[] = {
2507 PROC(GETATTR, getattr, getattr, 1),
2508 PROC(SETATTR, setattr, setattr, 0),
2509 PROC(LOOKUP, lookup, lookup, 2),
2510 PROC(ACCESS, access, access, 1),
2511 PROC(READLINK, readlink, readlink, 3),
2512 PROC(READ, read, read, 3),
2513 PROC(WRITE, write, write, 4),
2514 PROC(CREATE, create, create, 0),
2515 PROC(MKDIR, mkdir, create, 0),
2516 PROC(SYMLINK, symlink, create, 0),
2517 PROC(MKNOD, mknod, create, 0),
2518 PROC(REMOVE, remove, remove, 0),
2519 PROC(RMDIR, lookup, setattr, 0),
2520 PROC(RENAME, rename, rename, 0),
2521 PROC(LINK, link, link, 0),
2522 PROC(READDIR, readdir, readdir, 3),
2523 PROC(READDIRPLUS, readdirplus, readdir, 3),
2524 PROC(FSSTAT, getattr, fsstat, 0),
2525 PROC(FSINFO, getattr, fsinfo, 0),
2526 PROC(PATHCONF, getattr, pathconf, 0),
2527 PROC(COMMIT, commit, commit, 5),
2528 };
2529
2530 const struct rpc_version nfs_version3 = {
2531 .number = 3,
2532 .nrprocs = ARRAY_SIZE(nfs3_procedures),
2533 .procs = nfs3_procedures
2534 };
2535
2536 #ifdef CONFIG_NFS_V3_ACL
2537 static struct rpc_procinfo nfs3_acl_procedures[] = {
2538 [ACLPROC3_GETACL] = {
2539 .p_proc = ACLPROC3_GETACL,
2540 .p_encode = (kxdreproc_t)nfs3_xdr_enc_getacl3args,
2541 .p_decode = (kxdrdproc_t)nfs3_xdr_dec_getacl3res,
2542 .p_arglen = ACL3_getaclargs_sz,
2543 .p_replen = ACL3_getaclres_sz,
2544 .p_timer = 1,
2545 .p_name = "GETACL",
2546 },
2547 [ACLPROC3_SETACL] = {
2548 .p_proc = ACLPROC3_SETACL,
2549 .p_encode = (kxdreproc_t)nfs3_xdr_enc_setacl3args,
2550 .p_decode = (kxdrdproc_t)nfs3_xdr_dec_setacl3res,
2551 .p_arglen = ACL3_setaclargs_sz,
2552 .p_replen = ACL3_setaclres_sz,
2553 .p_timer = 0,
2554 .p_name = "SETACL",
2555 },
2556 };
2557
2558 const struct rpc_version nfsacl_version3 = {
2559 .number = 3,
2560 .nrprocs = sizeof(nfs3_acl_procedures)/
2561 sizeof(nfs3_acl_procedures[0]),
2562 .procs = nfs3_acl_procedures,
2563 };
2564 #endif /* CONFIG_NFS_V3_ACL */
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