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Merge tag 'v3.10.64' into update
[GitHub/mt8127/android_kernel_alcatel_ttab.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_readargs *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_readargs *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_writeargs *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_writeargs *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_readres *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_readres *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 if (status != NFS3_OK)
1640 goto out_status;
1641 error = decode_read3resok(xdr, result);
1642 out:
1643 return error;
1644 out_status:
1645 return nfs3_stat_to_errno(status);
1646 }
1647
1648 /*
1649 * 3.3.7 WRITE3res
1650 *
1651 * enum stable_how {
1652 * UNSTABLE = 0,
1653 * DATA_SYNC = 1,
1654 * FILE_SYNC = 2
1655 * };
1656 *
1657 * struct WRITE3resok {
1658 * wcc_data file_wcc;
1659 * count3 count;
1660 * stable_how committed;
1661 * writeverf3 verf;
1662 * };
1663 *
1664 * struct WRITE3resfail {
1665 * wcc_data file_wcc;
1666 * };
1667 *
1668 * union WRITE3res switch (nfsstat3 status) {
1669 * case NFS3_OK:
1670 * WRITE3resok resok;
1671 * default:
1672 * WRITE3resfail resfail;
1673 * };
1674 */
1675 static int decode_write3resok(struct xdr_stream *xdr,
1676 struct nfs_writeres *result)
1677 {
1678 __be32 *p;
1679
1680 p = xdr_inline_decode(xdr, 4 + 4);
1681 if (unlikely(p == NULL))
1682 goto out_overflow;
1683 result->count = be32_to_cpup(p++);
1684 result->verf->committed = be32_to_cpup(p++);
1685 if (unlikely(result->verf->committed > NFS_FILE_SYNC))
1686 goto out_badvalue;
1687 if (decode_writeverf3(xdr, &result->verf->verifier))
1688 goto out_eio;
1689 return result->count;
1690 out_badvalue:
1691 dprintk("NFS: bad stable_how value: %u\n", result->verf->committed);
1692 return -EIO;
1693 out_overflow:
1694 print_overflow_msg(__func__, xdr);
1695 out_eio:
1696 return -EIO;
1697 }
1698
1699 static int nfs3_xdr_dec_write3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1700 struct nfs_writeres *result)
1701 {
1702 enum nfs_stat status;
1703 int error;
1704
1705 error = decode_nfsstat3(xdr, &status);
1706 if (unlikely(error))
1707 goto out;
1708 error = decode_wcc_data(xdr, result->fattr);
1709 if (unlikely(error))
1710 goto out;
1711 if (status != NFS3_OK)
1712 goto out_status;
1713 error = decode_write3resok(xdr, result);
1714 out:
1715 return error;
1716 out_status:
1717 return nfs3_stat_to_errno(status);
1718 }
1719
1720 /*
1721 * 3.3.8 CREATE3res
1722 *
1723 * struct CREATE3resok {
1724 * post_op_fh3 obj;
1725 * post_op_attr obj_attributes;
1726 * wcc_data dir_wcc;
1727 * };
1728 *
1729 * struct CREATE3resfail {
1730 * wcc_data dir_wcc;
1731 * };
1732 *
1733 * union CREATE3res switch (nfsstat3 status) {
1734 * case NFS3_OK:
1735 * CREATE3resok resok;
1736 * default:
1737 * CREATE3resfail resfail;
1738 * };
1739 */
1740 static int decode_create3resok(struct xdr_stream *xdr,
1741 struct nfs3_diropres *result)
1742 {
1743 int error;
1744
1745 error = decode_post_op_fh3(xdr, result->fh);
1746 if (unlikely(error))
1747 goto out;
1748 error = decode_post_op_attr(xdr, result->fattr);
1749 if (unlikely(error))
1750 goto out;
1751 /* The server isn't required to return a file handle.
1752 * If it didn't, force the client to perform a LOOKUP
1753 * to determine the correct file handle and attribute
1754 * values for the new object. */
1755 if (result->fh->size == 0)
1756 result->fattr->valid = 0;
1757 error = decode_wcc_data(xdr, result->dir_attr);
1758 out:
1759 return error;
1760 }
1761
1762 static int nfs3_xdr_dec_create3res(struct rpc_rqst *req,
1763 struct xdr_stream *xdr,
1764 struct nfs3_diropres *result)
1765 {
1766 enum nfs_stat status;
1767 int error;
1768
1769 error = decode_nfsstat3(xdr, &status);
1770 if (unlikely(error))
1771 goto out;
1772 if (status != NFS3_OK)
1773 goto out_default;
1774 error = decode_create3resok(xdr, result);
1775 out:
1776 return error;
1777 out_default:
1778 error = decode_wcc_data(xdr, result->dir_attr);
1779 if (unlikely(error))
1780 goto out;
1781 return nfs3_stat_to_errno(status);
1782 }
1783
1784 /*
1785 * 3.3.12 REMOVE3res
1786 *
1787 * struct REMOVE3resok {
1788 * wcc_data dir_wcc;
1789 * };
1790 *
1791 * struct REMOVE3resfail {
1792 * wcc_data dir_wcc;
1793 * };
1794 *
1795 * union REMOVE3res switch (nfsstat3 status) {
1796 * case NFS3_OK:
1797 * REMOVE3resok resok;
1798 * default:
1799 * REMOVE3resfail resfail;
1800 * };
1801 */
1802 static int nfs3_xdr_dec_remove3res(struct rpc_rqst *req,
1803 struct xdr_stream *xdr,
1804 struct nfs_removeres *result)
1805 {
1806 enum nfs_stat status;
1807 int error;
1808
1809 error = decode_nfsstat3(xdr, &status);
1810 if (unlikely(error))
1811 goto out;
1812 error = decode_wcc_data(xdr, result->dir_attr);
1813 if (unlikely(error))
1814 goto out;
1815 if (status != NFS3_OK)
1816 goto out_status;
1817 out:
1818 return error;
1819 out_status:
1820 return nfs3_stat_to_errno(status);
1821 }
1822
1823 /*
1824 * 3.3.14 RENAME3res
1825 *
1826 * struct RENAME3resok {
1827 * wcc_data fromdir_wcc;
1828 * wcc_data todir_wcc;
1829 * };
1830 *
1831 * struct RENAME3resfail {
1832 * wcc_data fromdir_wcc;
1833 * wcc_data todir_wcc;
1834 * };
1835 *
1836 * union RENAME3res switch (nfsstat3 status) {
1837 * case NFS3_OK:
1838 * RENAME3resok resok;
1839 * default:
1840 * RENAME3resfail resfail;
1841 * };
1842 */
1843 static int nfs3_xdr_dec_rename3res(struct rpc_rqst *req,
1844 struct xdr_stream *xdr,
1845 struct nfs_renameres *result)
1846 {
1847 enum nfs_stat status;
1848 int error;
1849
1850 error = decode_nfsstat3(xdr, &status);
1851 if (unlikely(error))
1852 goto out;
1853 error = decode_wcc_data(xdr, result->old_fattr);
1854 if (unlikely(error))
1855 goto out;
1856 error = decode_wcc_data(xdr, result->new_fattr);
1857 if (unlikely(error))
1858 goto out;
1859 if (status != NFS3_OK)
1860 goto out_status;
1861 out:
1862 return error;
1863 out_status:
1864 return nfs3_stat_to_errno(status);
1865 }
1866
1867 /*
1868 * 3.3.15 LINK3res
1869 *
1870 * struct LINK3resok {
1871 * post_op_attr file_attributes;
1872 * wcc_data linkdir_wcc;
1873 * };
1874 *
1875 * struct LINK3resfail {
1876 * post_op_attr file_attributes;
1877 * wcc_data linkdir_wcc;
1878 * };
1879 *
1880 * union LINK3res switch (nfsstat3 status) {
1881 * case NFS3_OK:
1882 * LINK3resok resok;
1883 * default:
1884 * LINK3resfail resfail;
1885 * };
1886 */
1887 static int nfs3_xdr_dec_link3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1888 struct nfs3_linkres *result)
1889 {
1890 enum nfs_stat status;
1891 int error;
1892
1893 error = decode_nfsstat3(xdr, &status);
1894 if (unlikely(error))
1895 goto out;
1896 error = decode_post_op_attr(xdr, result->fattr);
1897 if (unlikely(error))
1898 goto out;
1899 error = decode_wcc_data(xdr, result->dir_attr);
1900 if (unlikely(error))
1901 goto out;
1902 if (status != NFS3_OK)
1903 goto out_status;
1904 out:
1905 return error;
1906 out_status:
1907 return nfs3_stat_to_errno(status);
1908 }
1909
1910 /**
1911 * nfs3_decode_dirent - Decode a single NFSv3 directory entry stored in
1912 * the local page cache
1913 * @xdr: XDR stream where entry resides
1914 * @entry: buffer to fill in with entry data
1915 * @plus: boolean indicating whether this should be a readdirplus entry
1916 *
1917 * Returns zero if successful, otherwise a negative errno value is
1918 * returned.
1919 *
1920 * This function is not invoked during READDIR reply decoding, but
1921 * rather whenever an application invokes the getdents(2) system call
1922 * on a directory already in our cache.
1923 *
1924 * 3.3.16 entry3
1925 *
1926 * struct entry3 {
1927 * fileid3 fileid;
1928 * filename3 name;
1929 * cookie3 cookie;
1930 * fhandle3 filehandle;
1931 * post_op_attr3 attributes;
1932 * entry3 *nextentry;
1933 * };
1934 *
1935 * 3.3.17 entryplus3
1936 * struct entryplus3 {
1937 * fileid3 fileid;
1938 * filename3 name;
1939 * cookie3 cookie;
1940 * post_op_attr name_attributes;
1941 * post_op_fh3 name_handle;
1942 * entryplus3 *nextentry;
1943 * };
1944 */
1945 int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
1946 int plus)
1947 {
1948 struct nfs_entry old = *entry;
1949 __be32 *p;
1950 int error;
1951
1952 p = xdr_inline_decode(xdr, 4);
1953 if (unlikely(p == NULL))
1954 goto out_overflow;
1955 if (*p == xdr_zero) {
1956 p = xdr_inline_decode(xdr, 4);
1957 if (unlikely(p == NULL))
1958 goto out_overflow;
1959 if (*p == xdr_zero)
1960 return -EAGAIN;
1961 entry->eof = 1;
1962 return -EBADCOOKIE;
1963 }
1964
1965 error = decode_fileid3(xdr, &entry->ino);
1966 if (unlikely(error))
1967 return error;
1968
1969 error = decode_inline_filename3(xdr, &entry->name, &entry->len);
1970 if (unlikely(error))
1971 return error;
1972
1973 entry->prev_cookie = entry->cookie;
1974 error = decode_cookie3(xdr, &entry->cookie);
1975 if (unlikely(error))
1976 return error;
1977
1978 entry->d_type = DT_UNKNOWN;
1979
1980 if (plus) {
1981 entry->fattr->valid = 0;
1982 error = decode_post_op_attr(xdr, entry->fattr);
1983 if (unlikely(error))
1984 return error;
1985 if (entry->fattr->valid & NFS_ATTR_FATTR_V3)
1986 entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);
1987
1988 /* In fact, a post_op_fh3: */
1989 p = xdr_inline_decode(xdr, 4);
1990 if (unlikely(p == NULL))
1991 goto out_overflow;
1992 if (*p != xdr_zero) {
1993 error = decode_nfs_fh3(xdr, entry->fh);
1994 if (unlikely(error)) {
1995 if (error == -E2BIG)
1996 goto out_truncated;
1997 return error;
1998 }
1999 } else
2000 zero_nfs_fh3(entry->fh);
2001 }
2002
2003 return 0;
2004
2005 out_overflow:
2006 print_overflow_msg(__func__, xdr);
2007 return -EAGAIN;
2008 out_truncated:
2009 dprintk("NFS: directory entry contains invalid file handle\n");
2010 *entry = old;
2011 return -EAGAIN;
2012 }
2013
2014 /*
2015 * 3.3.16 READDIR3res
2016 *
2017 * struct dirlist3 {
2018 * entry3 *entries;
2019 * bool eof;
2020 * };
2021 *
2022 * struct READDIR3resok {
2023 * post_op_attr dir_attributes;
2024 * cookieverf3 cookieverf;
2025 * dirlist3 reply;
2026 * };
2027 *
2028 * struct READDIR3resfail {
2029 * post_op_attr dir_attributes;
2030 * };
2031 *
2032 * union READDIR3res switch (nfsstat3 status) {
2033 * case NFS3_OK:
2034 * READDIR3resok resok;
2035 * default:
2036 * READDIR3resfail resfail;
2037 * };
2038 *
2039 * Read the directory contents into the page cache, but otherwise
2040 * don't touch them. The actual decoding is done by nfs3_decode_entry()
2041 * during subsequent nfs_readdir() calls.
2042 */
2043 static int decode_dirlist3(struct xdr_stream *xdr)
2044 {
2045 return xdr_read_pages(xdr, xdr->buf->page_len);
2046 }
2047
2048 static int decode_readdir3resok(struct xdr_stream *xdr,
2049 struct nfs3_readdirres *result)
2050 {
2051 int error;
2052
2053 error = decode_post_op_attr(xdr, result->dir_attr);
2054 if (unlikely(error))
2055 goto out;
2056 /* XXX: do we need to check if result->verf != NULL ? */
2057 error = decode_cookieverf3(xdr, result->verf);
2058 if (unlikely(error))
2059 goto out;
2060 error = decode_dirlist3(xdr);
2061 out:
2062 return error;
2063 }
2064
2065 static int nfs3_xdr_dec_readdir3res(struct rpc_rqst *req,
2066 struct xdr_stream *xdr,
2067 struct nfs3_readdirres *result)
2068 {
2069 enum nfs_stat status;
2070 int error;
2071
2072 error = decode_nfsstat3(xdr, &status);
2073 if (unlikely(error))
2074 goto out;
2075 if (status != NFS3_OK)
2076 goto out_default;
2077 error = decode_readdir3resok(xdr, result);
2078 out:
2079 return error;
2080 out_default:
2081 error = decode_post_op_attr(xdr, result->dir_attr);
2082 if (unlikely(error))
2083 goto out;
2084 return nfs3_stat_to_errno(status);
2085 }
2086
2087 /*
2088 * 3.3.18 FSSTAT3res
2089 *
2090 * struct FSSTAT3resok {
2091 * post_op_attr obj_attributes;
2092 * size3 tbytes;
2093 * size3 fbytes;
2094 * size3 abytes;
2095 * size3 tfiles;
2096 * size3 ffiles;
2097 * size3 afiles;
2098 * uint32 invarsec;
2099 * };
2100 *
2101 * struct FSSTAT3resfail {
2102 * post_op_attr obj_attributes;
2103 * };
2104 *
2105 * union FSSTAT3res switch (nfsstat3 status) {
2106 * case NFS3_OK:
2107 * FSSTAT3resok resok;
2108 * default:
2109 * FSSTAT3resfail resfail;
2110 * };
2111 */
2112 static int decode_fsstat3resok(struct xdr_stream *xdr,
2113 struct nfs_fsstat *result)
2114 {
2115 __be32 *p;
2116
2117 p = xdr_inline_decode(xdr, 8 * 6 + 4);
2118 if (unlikely(p == NULL))
2119 goto out_overflow;
2120 p = xdr_decode_size3(p, &result->tbytes);
2121 p = xdr_decode_size3(p, &result->fbytes);
2122 p = xdr_decode_size3(p, &result->abytes);
2123 p = xdr_decode_size3(p, &result->tfiles);
2124 p = xdr_decode_size3(p, &result->ffiles);
2125 xdr_decode_size3(p, &result->afiles);
2126 /* ignore invarsec */
2127 return 0;
2128 out_overflow:
2129 print_overflow_msg(__func__, xdr);
2130 return -EIO;
2131 }
2132
2133 static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req,
2134 struct xdr_stream *xdr,
2135 struct nfs_fsstat *result)
2136 {
2137 enum nfs_stat status;
2138 int error;
2139
2140 error = decode_nfsstat3(xdr, &status);
2141 if (unlikely(error))
2142 goto out;
2143 error = decode_post_op_attr(xdr, result->fattr);
2144 if (unlikely(error))
2145 goto out;
2146 if (status != NFS3_OK)
2147 goto out_status;
2148 error = decode_fsstat3resok(xdr, result);
2149 out:
2150 return error;
2151 out_status:
2152 return nfs3_stat_to_errno(status);
2153 }
2154
2155 /*
2156 * 3.3.19 FSINFO3res
2157 *
2158 * struct FSINFO3resok {
2159 * post_op_attr obj_attributes;
2160 * uint32 rtmax;
2161 * uint32 rtpref;
2162 * uint32 rtmult;
2163 * uint32 wtmax;
2164 * uint32 wtpref;
2165 * uint32 wtmult;
2166 * uint32 dtpref;
2167 * size3 maxfilesize;
2168 * nfstime3 time_delta;
2169 * uint32 properties;
2170 * };
2171 *
2172 * struct FSINFO3resfail {
2173 * post_op_attr obj_attributes;
2174 * };
2175 *
2176 * union FSINFO3res switch (nfsstat3 status) {
2177 * case NFS3_OK:
2178 * FSINFO3resok resok;
2179 * default:
2180 * FSINFO3resfail resfail;
2181 * };
2182 */
2183 static int decode_fsinfo3resok(struct xdr_stream *xdr,
2184 struct nfs_fsinfo *result)
2185 {
2186 __be32 *p;
2187
2188 p = xdr_inline_decode(xdr, 4 * 7 + 8 + 8 + 4);
2189 if (unlikely(p == NULL))
2190 goto out_overflow;
2191 result->rtmax = be32_to_cpup(p++);
2192 result->rtpref = be32_to_cpup(p++);
2193 result->rtmult = be32_to_cpup(p++);
2194 result->wtmax = be32_to_cpup(p++);
2195 result->wtpref = be32_to_cpup(p++);
2196 result->wtmult = be32_to_cpup(p++);
2197 result->dtpref = be32_to_cpup(p++);
2198 p = xdr_decode_size3(p, &result->maxfilesize);
2199 xdr_decode_nfstime3(p, &result->time_delta);
2200
2201 /* ignore properties */
2202 result->lease_time = 0;
2203 return 0;
2204 out_overflow:
2205 print_overflow_msg(__func__, xdr);
2206 return -EIO;
2207 }
2208
2209 static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req,
2210 struct xdr_stream *xdr,
2211 struct nfs_fsinfo *result)
2212 {
2213 enum nfs_stat status;
2214 int error;
2215
2216 error = decode_nfsstat3(xdr, &status);
2217 if (unlikely(error))
2218 goto out;
2219 error = decode_post_op_attr(xdr, result->fattr);
2220 if (unlikely(error))
2221 goto out;
2222 if (status != NFS3_OK)
2223 goto out_status;
2224 error = decode_fsinfo3resok(xdr, result);
2225 out:
2226 return error;
2227 out_status:
2228 return nfs3_stat_to_errno(status);
2229 }
2230
2231 /*
2232 * 3.3.20 PATHCONF3res
2233 *
2234 * struct PATHCONF3resok {
2235 * post_op_attr obj_attributes;
2236 * uint32 linkmax;
2237 * uint32 name_max;
2238 * bool no_trunc;
2239 * bool chown_restricted;
2240 * bool case_insensitive;
2241 * bool case_preserving;
2242 * };
2243 *
2244 * struct PATHCONF3resfail {
2245 * post_op_attr obj_attributes;
2246 * };
2247 *
2248 * union PATHCONF3res switch (nfsstat3 status) {
2249 * case NFS3_OK:
2250 * PATHCONF3resok resok;
2251 * default:
2252 * PATHCONF3resfail resfail;
2253 * };
2254 */
2255 static int decode_pathconf3resok(struct xdr_stream *xdr,
2256 struct nfs_pathconf *result)
2257 {
2258 __be32 *p;
2259
2260 p = xdr_inline_decode(xdr, 4 * 6);
2261 if (unlikely(p == NULL))
2262 goto out_overflow;
2263 result->max_link = be32_to_cpup(p++);
2264 result->max_namelen = be32_to_cpup(p);
2265 /* ignore remaining fields */
2266 return 0;
2267 out_overflow:
2268 print_overflow_msg(__func__, xdr);
2269 return -EIO;
2270 }
2271
2272 static int nfs3_xdr_dec_pathconf3res(struct rpc_rqst *req,
2273 struct xdr_stream *xdr,
2274 struct nfs_pathconf *result)
2275 {
2276 enum nfs_stat status;
2277 int error;
2278
2279 error = decode_nfsstat3(xdr, &status);
2280 if (unlikely(error))
2281 goto out;
2282 error = decode_post_op_attr(xdr, result->fattr);
2283 if (unlikely(error))
2284 goto out;
2285 if (status != NFS3_OK)
2286 goto out_status;
2287 error = decode_pathconf3resok(xdr, result);
2288 out:
2289 return error;
2290 out_status:
2291 return nfs3_stat_to_errno(status);
2292 }
2293
2294 /*
2295 * 3.3.21 COMMIT3res
2296 *
2297 * struct COMMIT3resok {
2298 * wcc_data file_wcc;
2299 * writeverf3 verf;
2300 * };
2301 *
2302 * struct COMMIT3resfail {
2303 * wcc_data file_wcc;
2304 * };
2305 *
2306 * union COMMIT3res switch (nfsstat3 status) {
2307 * case NFS3_OK:
2308 * COMMIT3resok resok;
2309 * default:
2310 * COMMIT3resfail resfail;
2311 * };
2312 */
2313 static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req,
2314 struct xdr_stream *xdr,
2315 struct nfs_commitres *result)
2316 {
2317 enum nfs_stat status;
2318 int error;
2319
2320 error = decode_nfsstat3(xdr, &status);
2321 if (unlikely(error))
2322 goto out;
2323 error = decode_wcc_data(xdr, result->fattr);
2324 if (unlikely(error))
2325 goto out;
2326 if (status != NFS3_OK)
2327 goto out_status;
2328 error = decode_writeverf3(xdr, &result->verf->verifier);
2329 out:
2330 return error;
2331 out_status:
2332 return nfs3_stat_to_errno(status);
2333 }
2334
2335 #ifdef CONFIG_NFS_V3_ACL
2336
2337 static inline int decode_getacl3resok(struct xdr_stream *xdr,
2338 struct nfs3_getaclres *result)
2339 {
2340 struct posix_acl **acl;
2341 unsigned int *aclcnt;
2342 size_t hdrlen;
2343 int error;
2344
2345 error = decode_post_op_attr(xdr, result->fattr);
2346 if (unlikely(error))
2347 goto out;
2348 error = decode_uint32(xdr, &result->mask);
2349 if (unlikely(error))
2350 goto out;
2351 error = -EINVAL;
2352 if (result->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
2353 goto out;
2354
2355 hdrlen = xdr_stream_pos(xdr);
2356
2357 acl = NULL;
2358 if (result->mask & NFS_ACL)
2359 acl = &result->acl_access;
2360 aclcnt = NULL;
2361 if (result->mask & NFS_ACLCNT)
2362 aclcnt = &result->acl_access_count;
2363 error = nfsacl_decode(xdr->buf, hdrlen, aclcnt, acl);
2364 if (unlikely(error <= 0))
2365 goto out;
2366
2367 acl = NULL;
2368 if (result->mask & NFS_DFACL)
2369 acl = &result->acl_default;
2370 aclcnt = NULL;
2371 if (result->mask & NFS_DFACLCNT)
2372 aclcnt = &result->acl_default_count;
2373 error = nfsacl_decode(xdr->buf, hdrlen + error, aclcnt, acl);
2374 if (unlikely(error <= 0))
2375 return error;
2376 error = 0;
2377 out:
2378 return error;
2379 }
2380
2381 static int nfs3_xdr_dec_getacl3res(struct rpc_rqst *req,
2382 struct xdr_stream *xdr,
2383 struct nfs3_getaclres *result)
2384 {
2385 enum nfs_stat status;
2386 int error;
2387
2388 error = decode_nfsstat3(xdr, &status);
2389 if (unlikely(error))
2390 goto out;
2391 if (status != NFS3_OK)
2392 goto out_default;
2393 error = decode_getacl3resok(xdr, result);
2394 out:
2395 return error;
2396 out_default:
2397 return nfs3_stat_to_errno(status);
2398 }
2399
2400 static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req,
2401 struct xdr_stream *xdr,
2402 struct nfs_fattr *result)
2403 {
2404 enum nfs_stat status;
2405 int error;
2406
2407 error = decode_nfsstat3(xdr, &status);
2408 if (unlikely(error))
2409 goto out;
2410 if (status != NFS3_OK)
2411 goto out_default;
2412 error = decode_post_op_attr(xdr, result);
2413 out:
2414 return error;
2415 out_default:
2416 return nfs3_stat_to_errno(status);
2417 }
2418
2419 #endif /* CONFIG_NFS_V3_ACL */
2420
2421
2422 /*
2423 * We need to translate between nfs status return values and
2424 * the local errno values which may not be the same.
2425 */
2426 static const struct {
2427 int stat;
2428 int errno;
2429 } nfs_errtbl[] = {
2430 { NFS_OK, 0 },
2431 { NFSERR_PERM, -EPERM },
2432 { NFSERR_NOENT, -ENOENT },
2433 { NFSERR_IO, -errno_NFSERR_IO},
2434 { NFSERR_NXIO, -ENXIO },
2435 /* { NFSERR_EAGAIN, -EAGAIN }, */
2436 { NFSERR_ACCES, -EACCES },
2437 { NFSERR_EXIST, -EEXIST },
2438 { NFSERR_XDEV, -EXDEV },
2439 { NFSERR_NODEV, -ENODEV },
2440 { NFSERR_NOTDIR, -ENOTDIR },
2441 { NFSERR_ISDIR, -EISDIR },
2442 { NFSERR_INVAL, -EINVAL },
2443 { NFSERR_FBIG, -EFBIG },
2444 { NFSERR_NOSPC, -ENOSPC },
2445 { NFSERR_ROFS, -EROFS },
2446 { NFSERR_MLINK, -EMLINK },
2447 { NFSERR_NAMETOOLONG, -ENAMETOOLONG },
2448 { NFSERR_NOTEMPTY, -ENOTEMPTY },
2449 { NFSERR_DQUOT, -EDQUOT },
2450 { NFSERR_STALE, -ESTALE },
2451 { NFSERR_REMOTE, -EREMOTE },
2452 #ifdef EWFLUSH
2453 { NFSERR_WFLUSH, -EWFLUSH },
2454 #endif
2455 { NFSERR_BADHANDLE, -EBADHANDLE },
2456 { NFSERR_NOT_SYNC, -ENOTSYNC },
2457 { NFSERR_BAD_COOKIE, -EBADCOOKIE },
2458 { NFSERR_NOTSUPP, -ENOTSUPP },
2459 { NFSERR_TOOSMALL, -ETOOSMALL },
2460 { NFSERR_SERVERFAULT, -EREMOTEIO },
2461 { NFSERR_BADTYPE, -EBADTYPE },
2462 { NFSERR_JUKEBOX, -EJUKEBOX },
2463 { -1, -EIO }
2464 };
2465
2466 /**
2467 * nfs3_stat_to_errno - convert an NFS status code to a local errno
2468 * @status: NFS status code to convert
2469 *
2470 * Returns a local errno value, or -EIO if the NFS status code is
2471 * not recognized. This function is used jointly by NFSv2 and NFSv3.
2472 */
2473 static int nfs3_stat_to_errno(enum nfs_stat status)
2474 {
2475 int i;
2476
2477 for (i = 0; nfs_errtbl[i].stat != -1; i++) {
2478 if (nfs_errtbl[i].stat == (int)status)
2479 return nfs_errtbl[i].errno;
2480 }
2481 dprintk("NFS: Unrecognized nfs status value: %u\n", status);
2482 return nfs_errtbl[i].errno;
2483 }
2484
2485
2486 #define PROC(proc, argtype, restype, timer) \
2487 [NFS3PROC_##proc] = { \
2488 .p_proc = NFS3PROC_##proc, \
2489 .p_encode = (kxdreproc_t)nfs3_xdr_enc_##argtype##3args, \
2490 .p_decode = (kxdrdproc_t)nfs3_xdr_dec_##restype##3res, \
2491 .p_arglen = NFS3_##argtype##args_sz, \
2492 .p_replen = NFS3_##restype##res_sz, \
2493 .p_timer = timer, \
2494 .p_statidx = NFS3PROC_##proc, \
2495 .p_name = #proc, \
2496 }
2497
2498 struct rpc_procinfo nfs3_procedures[] = {
2499 PROC(GETATTR, getattr, getattr, 1),
2500 PROC(SETATTR, setattr, setattr, 0),
2501 PROC(LOOKUP, lookup, lookup, 2),
2502 PROC(ACCESS, access, access, 1),
2503 PROC(READLINK, readlink, readlink, 3),
2504 PROC(READ, read, read, 3),
2505 PROC(WRITE, write, write, 4),
2506 PROC(CREATE, create, create, 0),
2507 PROC(MKDIR, mkdir, create, 0),
2508 PROC(SYMLINK, symlink, create, 0),
2509 PROC(MKNOD, mknod, create, 0),
2510 PROC(REMOVE, remove, remove, 0),
2511 PROC(RMDIR, lookup, setattr, 0),
2512 PROC(RENAME, rename, rename, 0),
2513 PROC(LINK, link, link, 0),
2514 PROC(READDIR, readdir, readdir, 3),
2515 PROC(READDIRPLUS, readdirplus, readdir, 3),
2516 PROC(FSSTAT, getattr, fsstat, 0),
2517 PROC(FSINFO, getattr, fsinfo, 0),
2518 PROC(PATHCONF, getattr, pathconf, 0),
2519 PROC(COMMIT, commit, commit, 5),
2520 };
2521
2522 const struct rpc_version nfs_version3 = {
2523 .number = 3,
2524 .nrprocs = ARRAY_SIZE(nfs3_procedures),
2525 .procs = nfs3_procedures
2526 };
2527
2528 #ifdef CONFIG_NFS_V3_ACL
2529 static struct rpc_procinfo nfs3_acl_procedures[] = {
2530 [ACLPROC3_GETACL] = {
2531 .p_proc = ACLPROC3_GETACL,
2532 .p_encode = (kxdreproc_t)nfs3_xdr_enc_getacl3args,
2533 .p_decode = (kxdrdproc_t)nfs3_xdr_dec_getacl3res,
2534 .p_arglen = ACL3_getaclargs_sz,
2535 .p_replen = ACL3_getaclres_sz,
2536 .p_timer = 1,
2537 .p_name = "GETACL",
2538 },
2539 [ACLPROC3_SETACL] = {
2540 .p_proc = ACLPROC3_SETACL,
2541 .p_encode = (kxdreproc_t)nfs3_xdr_enc_setacl3args,
2542 .p_decode = (kxdrdproc_t)nfs3_xdr_dec_setacl3res,
2543 .p_arglen = ACL3_setaclargs_sz,
2544 .p_replen = ACL3_setaclres_sz,
2545 .p_timer = 0,
2546 .p_name = "SETACL",
2547 },
2548 };
2549
2550 const struct rpc_version nfsacl_version3 = {
2551 .number = 3,
2552 .nrprocs = sizeof(nfs3_acl_procedures)/
2553 sizeof(nfs3_acl_procedures[0]),
2554 .procs = nfs3_acl_procedures,
2555 };
2556 #endif /* CONFIG_NFS_V3_ACL */
kernel source for telekom puls (alcatel/mediatek)