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net/mlx4_en: Fix traffic loss under promiscuous mode
[linux-2.6.git] / fs / nfs / nfs3xdr.c
blobbffc32406fbf81b764d43a298e12489b5fa37faf
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(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(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 = be32_to_cpup(p++);
661 fattr->gid = be32_to_cpup(p++);
662
663 p = xdr_decode_size3(p, &fattr->size);
664 p = xdr_decode_size3(p, &fattr->du.nfs3.used);
665 p = xdr_decode_specdata3(p, &fattr->rdev);
666
667 p = xdr_decode_hyper(p, &fattr->fsid.major);
668 fattr->fsid.minor = 0;
669
670 p = xdr_decode_fileid3(p, &fattr->fileid);
671 p = xdr_decode_nfstime3(p, &fattr->atime);
672 p = xdr_decode_nfstime3(p, &fattr->mtime);
673 xdr_decode_nfstime3(p, &fattr->ctime);
674 fattr->change_attr = nfs_timespec_to_change_attr(&fattr->ctime);
675
676 fattr->valid |= NFS_ATTR_FATTR_V3;
677 return 0;
678 out_overflow:
679 print_overflow_msg(__func__, xdr);
680 return -EIO;
681 }
682
683 /*
684 * post_op_attr
685 *
686 * union post_op_attr switch (bool attributes_follow) {
687 * case TRUE:
688 * fattr3 attributes;
689 * case FALSE:
690 * void;
691 * };
692 */
693 static int decode_post_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
694 {
695 __be32 *p;
696
697 p = xdr_inline_decode(xdr, 4);
698 if (unlikely(p == NULL))
699 goto out_overflow;
700 if (*p != xdr_zero)
701 return decode_fattr3(xdr, fattr);
702 return 0;
703 out_overflow:
704 print_overflow_msg(__func__, xdr);
705 return -EIO;
706 }
707
708 /*
709 * wcc_attr
710 * struct wcc_attr {
711 * size3 size;
712 * nfstime3 mtime;
713 * nfstime3 ctime;
714 * };
715 */
716 static int decode_wcc_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
717 {
718 __be32 *p;
719
720 p = xdr_inline_decode(xdr, NFS3_wcc_attr_sz << 2);
721 if (unlikely(p == NULL))
722 goto out_overflow;
723
724 fattr->valid |= NFS_ATTR_FATTR_PRESIZE
725 | NFS_ATTR_FATTR_PRECHANGE
726 | NFS_ATTR_FATTR_PREMTIME
727 | NFS_ATTR_FATTR_PRECTIME;
728
729 p = xdr_decode_size3(p, &fattr->pre_size);
730 p = xdr_decode_nfstime3(p, &fattr->pre_mtime);
731 xdr_decode_nfstime3(p, &fattr->pre_ctime);
732 fattr->pre_change_attr = nfs_timespec_to_change_attr(&fattr->pre_ctime);
733
734 return 0;
735 out_overflow:
736 print_overflow_msg(__func__, xdr);
737 return -EIO;
738 }
739
740 /*
741 * pre_op_attr
742 * union pre_op_attr switch (bool attributes_follow) {
743 * case TRUE:
744 * wcc_attr attributes;
745 * case FALSE:
746 * void;
747 * };
748 *
749 * wcc_data
750 *
751 * struct wcc_data {
752 * pre_op_attr before;
753 * post_op_attr after;
754 * };
755 */
756 static int decode_pre_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
757 {
758 __be32 *p;
759
760 p = xdr_inline_decode(xdr, 4);
761 if (unlikely(p == NULL))
762 goto out_overflow;
763 if (*p != xdr_zero)
764 return decode_wcc_attr(xdr, fattr);
765 return 0;
766 out_overflow:
767 print_overflow_msg(__func__, xdr);
768 return -EIO;
769 }
770
771 static int decode_wcc_data(struct xdr_stream *xdr, struct nfs_fattr *fattr)
772 {
773 int error;
774
775 error = decode_pre_op_attr(xdr, fattr);
776 if (unlikely(error))
777 goto out;
778 error = decode_post_op_attr(xdr, fattr);
779 out:
780 return error;
781 }
782
783 /*
784 * post_op_fh3
785 *
786 * union post_op_fh3 switch (bool handle_follows) {
787 * case TRUE:
788 * nfs_fh3 handle;
789 * case FALSE:
790 * void;
791 * };
792 */
793 static int decode_post_op_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
794 {
795 __be32 *p = xdr_inline_decode(xdr, 4);
796 if (unlikely(p == NULL))
797 goto out_overflow;
798 if (*p != xdr_zero)
799 return decode_nfs_fh3(xdr, fh);
800 zero_nfs_fh3(fh);
801 return 0;
802 out_overflow:
803 print_overflow_msg(__func__, xdr);
804 return -EIO;
805 }
806
807 /*
808 * diropargs3
809 *
810 * struct diropargs3 {
811 * nfs_fh3 dir;
812 * filename3 name;
813 * };
814 */
815 static void encode_diropargs3(struct xdr_stream *xdr, const struct nfs_fh *fh,
816 const char *name, u32 length)
817 {
818 encode_nfs_fh3(xdr, fh);
819 encode_filename3(xdr, name, length);
820 }
821
822
823 /*
824 * NFSv3 XDR encode functions
825 *
826 * NFSv3 argument types are defined in section 3.3 of RFC 1813:
827 * "NFS Version 3 Protocol Specification".
828 */
829
830 /*
831 * 3.3.1 GETATTR3args
832 *
833 * struct GETATTR3args {
834 * nfs_fh3 object;
835 * };
836 */
837 static void nfs3_xdr_enc_getattr3args(struct rpc_rqst *req,
838 struct xdr_stream *xdr,
839 const struct nfs_fh *fh)
840 {
841 encode_nfs_fh3(xdr, fh);
842 }
843
844 /*
845 * 3.3.2 SETATTR3args
846 *
847 * union sattrguard3 switch (bool check) {
848 * case TRUE:
849 * nfstime3 obj_ctime;
850 * case FALSE:
851 * void;
852 * };
853 *
854 * struct SETATTR3args {
855 * nfs_fh3 object;
856 * sattr3 new_attributes;
857 * sattrguard3 guard;
858 * };
859 */
860 static void encode_sattrguard3(struct xdr_stream *xdr,
861 const struct nfs3_sattrargs *args)
862 {
863 __be32 *p;
864
865 if (args->guard) {
866 p = xdr_reserve_space(xdr, 4 + 8);
867 *p++ = xdr_one;
868 xdr_encode_nfstime3(p, &args->guardtime);
869 } else {
870 p = xdr_reserve_space(xdr, 4);
871 *p = xdr_zero;
872 }
873 }
874
875 static void nfs3_xdr_enc_setattr3args(struct rpc_rqst *req,
876 struct xdr_stream *xdr,
877 const struct nfs3_sattrargs *args)
878 {
879 encode_nfs_fh3(xdr, args->fh);
880 encode_sattr3(xdr, args->sattr);
881 encode_sattrguard3(xdr, args);
882 }
883
884 /*
885 * 3.3.3 LOOKUP3args
886 *
887 * struct LOOKUP3args {
888 * diropargs3 what;
889 * };
890 */
891 static void nfs3_xdr_enc_lookup3args(struct rpc_rqst *req,
892 struct xdr_stream *xdr,
893 const struct nfs3_diropargs *args)
894 {
895 encode_diropargs3(xdr, args->fh, args->name, args->len);
896 }
897
898 /*
899 * 3.3.4 ACCESS3args
900 *
901 * struct ACCESS3args {
902 * nfs_fh3 object;
903 * uint32 access;
904 * };
905 */
906 static void encode_access3args(struct xdr_stream *xdr,
907 const struct nfs3_accessargs *args)
908 {
909 encode_nfs_fh3(xdr, args->fh);
910 encode_uint32(xdr, args->access);
911 }
912
913 static void nfs3_xdr_enc_access3args(struct rpc_rqst *req,
914 struct xdr_stream *xdr,
915 const struct nfs3_accessargs *args)
916 {
917 encode_access3args(xdr, args);
918 }
919
920 /*
921 * 3.3.5 READLINK3args
922 *
923 * struct READLINK3args {
924 * nfs_fh3 symlink;
925 * };
926 */
927 static void nfs3_xdr_enc_readlink3args(struct rpc_rqst *req,
928 struct xdr_stream *xdr,
929 const struct nfs3_readlinkargs *args)
930 {
931 encode_nfs_fh3(xdr, args->fh);
932 prepare_reply_buffer(req, args->pages, args->pgbase,
933 args->pglen, NFS3_readlinkres_sz);
934 }
935
936 /*
937 * 3.3.6 READ3args
938 *
939 * struct READ3args {
940 * nfs_fh3 file;
941 * offset3 offset;
942 * count3 count;
943 * };
944 */
945 static void encode_read3args(struct xdr_stream *xdr,
946 const struct nfs_readargs *args)
947 {
948 __be32 *p;
949
950 encode_nfs_fh3(xdr, args->fh);
951
952 p = xdr_reserve_space(xdr, 8 + 4);
953 p = xdr_encode_hyper(p, args->offset);
954 *p = cpu_to_be32(args->count);
955 }
956
957 static void nfs3_xdr_enc_read3args(struct rpc_rqst *req,
958 struct xdr_stream *xdr,
959 const struct nfs_readargs *args)
960 {
961 encode_read3args(xdr, args);
962 prepare_reply_buffer(req, args->pages, args->pgbase,
963 args->count, NFS3_readres_sz);
964 req->rq_rcv_buf.flags |= XDRBUF_READ;
965 }
966
967 /*
968 * 3.3.7 WRITE3args
969 *
970 * enum stable_how {
971 * UNSTABLE = 0,
972 * DATA_SYNC = 1,
973 * FILE_SYNC = 2
974 * };
975 *
976 * struct WRITE3args {
977 * nfs_fh3 file;
978 * offset3 offset;
979 * count3 count;
980 * stable_how stable;
981 * opaque data<>;
982 * };
983 */
984 static void encode_write3args(struct xdr_stream *xdr,
985 const struct nfs_writeargs *args)
986 {
987 __be32 *p;
988
989 encode_nfs_fh3(xdr, args->fh);
990
991 p = xdr_reserve_space(xdr, 8 + 4 + 4 + 4);
992 p = xdr_encode_hyper(p, args->offset);
993 *p++ = cpu_to_be32(args->count);
994 *p++ = cpu_to_be32(args->stable);
995 *p = cpu_to_be32(args->count);
996 xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
997 }
998
999 static void nfs3_xdr_enc_write3args(struct rpc_rqst *req,
1000 struct xdr_stream *xdr,
1001 const struct nfs_writeargs *args)
1002 {
1003 encode_write3args(xdr, args);
1004 xdr->buf->flags |= XDRBUF_WRITE;
1005 }
1006
1007 /*
1008 * 3.3.8 CREATE3args
1009 *
1010 * enum createmode3 {
1011 * UNCHECKED = 0,
1012 * GUARDED = 1,
1013 * EXCLUSIVE = 2
1014 * };
1015 *
1016 * union createhow3 switch (createmode3 mode) {
1017 * case UNCHECKED:
1018 * case GUARDED:
1019 * sattr3 obj_attributes;
1020 * case EXCLUSIVE:
1021 * createverf3 verf;
1022 * };
1023 *
1024 * struct CREATE3args {
1025 * diropargs3 where;
1026 * createhow3 how;
1027 * };
1028 */
1029 static void encode_createhow3(struct xdr_stream *xdr,
1030 const struct nfs3_createargs *args)
1031 {
1032 encode_uint32(xdr, args->createmode);
1033 switch (args->createmode) {
1034 case NFS3_CREATE_UNCHECKED:
1035 case NFS3_CREATE_GUARDED:
1036 encode_sattr3(xdr, args->sattr);
1037 break;
1038 case NFS3_CREATE_EXCLUSIVE:
1039 encode_createverf3(xdr, args->verifier);
1040 break;
1041 default:
1042 BUG();
1043 }
1044 }
1045
1046 static void nfs3_xdr_enc_create3args(struct rpc_rqst *req,
1047 struct xdr_stream *xdr,
1048 const struct nfs3_createargs *args)
1049 {
1050 encode_diropargs3(xdr, args->fh, args->name, args->len);
1051 encode_createhow3(xdr, args);
1052 }
1053
1054 /*
1055 * 3.3.9 MKDIR3args
1056 *
1057 * struct MKDIR3args {
1058 * diropargs3 where;
1059 * sattr3 attributes;
1060 * };
1061 */
1062 static void nfs3_xdr_enc_mkdir3args(struct rpc_rqst *req,
1063 struct xdr_stream *xdr,
1064 const struct nfs3_mkdirargs *args)
1065 {
1066 encode_diropargs3(xdr, args->fh, args->name, args->len);
1067 encode_sattr3(xdr, args->sattr);
1068 }
1069
1070 /*
1071 * 3.3.10 SYMLINK3args
1072 *
1073 * struct symlinkdata3 {
1074 * sattr3 symlink_attributes;
1075 * nfspath3 symlink_data;
1076 * };
1077 *
1078 * struct SYMLINK3args {
1079 * diropargs3 where;
1080 * symlinkdata3 symlink;
1081 * };
1082 */
1083 static void encode_symlinkdata3(struct xdr_stream *xdr,
1084 const struct nfs3_symlinkargs *args)
1085 {
1086 encode_sattr3(xdr, args->sattr);
1087 encode_nfspath3(xdr, args->pages, args->pathlen);
1088 }
1089
1090 static void nfs3_xdr_enc_symlink3args(struct rpc_rqst *req,
1091 struct xdr_stream *xdr,
1092 const struct nfs3_symlinkargs *args)
1093 {
1094 encode_diropargs3(xdr, args->fromfh, args->fromname, args->fromlen);
1095 encode_symlinkdata3(xdr, args);
1096 }
1097
1098 /*
1099 * 3.3.11 MKNOD3args
1100 *
1101 * struct devicedata3 {
1102 * sattr3 dev_attributes;
1103 * specdata3 spec;
1104 * };
1105 *
1106 * union mknoddata3 switch (ftype3 type) {
1107 * case NF3CHR:
1108 * case NF3BLK:
1109 * devicedata3 device;
1110 * case NF3SOCK:
1111 * case NF3FIFO:
1112 * sattr3 pipe_attributes;
1113 * default:
1114 * void;
1115 * };
1116 *
1117 * struct MKNOD3args {
1118 * diropargs3 where;
1119 * mknoddata3 what;
1120 * };
1121 */
1122 static void encode_devicedata3(struct xdr_stream *xdr,
1123 const struct nfs3_mknodargs *args)
1124 {
1125 encode_sattr3(xdr, args->sattr);
1126 encode_specdata3(xdr, args->rdev);
1127 }
1128
1129 static void encode_mknoddata3(struct xdr_stream *xdr,
1130 const struct nfs3_mknodargs *args)
1131 {
1132 encode_ftype3(xdr, args->type);
1133 switch (args->type) {
1134 case NF3CHR:
1135 case NF3BLK:
1136 encode_devicedata3(xdr, args);
1137 break;
1138 case NF3SOCK:
1139 case NF3FIFO:
1140 encode_sattr3(xdr, args->sattr);
1141 break;
1142 case NF3REG:
1143 case NF3DIR:
1144 break;
1145 default:
1146 BUG();
1147 }
1148 }
1149
1150 static void nfs3_xdr_enc_mknod3args(struct rpc_rqst *req,
1151 struct xdr_stream *xdr,
1152 const struct nfs3_mknodargs *args)
1153 {
1154 encode_diropargs3(xdr, args->fh, args->name, args->len);
1155 encode_mknoddata3(xdr, args);
1156 }
1157
1158 /*
1159 * 3.3.12 REMOVE3args
1160 *
1161 * struct REMOVE3args {
1162 * diropargs3 object;
1163 * };
1164 */
1165 static void nfs3_xdr_enc_remove3args(struct rpc_rqst *req,
1166 struct xdr_stream *xdr,
1167 const struct nfs_removeargs *args)
1168 {
1169 encode_diropargs3(xdr, args->fh, args->name.name, args->name.len);
1170 }
1171
1172 /*
1173 * 3.3.14 RENAME3args
1174 *
1175 * struct RENAME3args {
1176 * diropargs3 from;
1177 * diropargs3 to;
1178 * };
1179 */
1180 static void nfs3_xdr_enc_rename3args(struct rpc_rqst *req,
1181 struct xdr_stream *xdr,
1182 const struct nfs_renameargs *args)
1183 {
1184 const struct qstr *old = args->old_name;
1185 const struct qstr *new = args->new_name;
1186
1187 encode_diropargs3(xdr, args->old_dir, old->name, old->len);
1188 encode_diropargs3(xdr, args->new_dir, new->name, new->len);
1189 }
1190
1191 /*
1192 * 3.3.15 LINK3args
1193 *
1194 * struct LINK3args {
1195 * nfs_fh3 file;
1196 * diropargs3 link;
1197 * };
1198 */
1199 static void nfs3_xdr_enc_link3args(struct rpc_rqst *req,
1200 struct xdr_stream *xdr,
1201 const struct nfs3_linkargs *args)
1202 {
1203 encode_nfs_fh3(xdr, args->fromfh);
1204 encode_diropargs3(xdr, args->tofh, args->toname, args->tolen);
1205 }
1206
1207 /*
1208 * 3.3.16 READDIR3args
1209 *
1210 * struct READDIR3args {
1211 * nfs_fh3 dir;
1212 * cookie3 cookie;
1213 * cookieverf3 cookieverf;
1214 * count3 count;
1215 * };
1216 */
1217 static void encode_readdir3args(struct xdr_stream *xdr,
1218 const struct nfs3_readdirargs *args)
1219 {
1220 __be32 *p;
1221
1222 encode_nfs_fh3(xdr, args->fh);
1223
1224 p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4);
1225 p = xdr_encode_cookie3(p, args->cookie);
1226 p = xdr_encode_cookieverf3(p, args->verf);
1227 *p = cpu_to_be32(args->count);
1228 }
1229
1230 static void nfs3_xdr_enc_readdir3args(struct rpc_rqst *req,
1231 struct xdr_stream *xdr,
1232 const struct nfs3_readdirargs *args)
1233 {
1234 encode_readdir3args(xdr, args);
1235 prepare_reply_buffer(req, args->pages, 0,
1236 args->count, NFS3_readdirres_sz);
1237 }
1238
1239 /*
1240 * 3.3.17 READDIRPLUS3args
1241 *
1242 * struct READDIRPLUS3args {
1243 * nfs_fh3 dir;
1244 * cookie3 cookie;
1245 * cookieverf3 cookieverf;
1246 * count3 dircount;
1247 * count3 maxcount;
1248 * };
1249 */
1250 static void encode_readdirplus3args(struct xdr_stream *xdr,
1251 const struct nfs3_readdirargs *args)
1252 {
1253 __be32 *p;
1254
1255 encode_nfs_fh3(xdr, args->fh);
1256
1257 p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4 + 4);
1258 p = xdr_encode_cookie3(p, args->cookie);
1259 p = xdr_encode_cookieverf3(p, args->verf);
1260
1261 /*
1262 * readdirplus: need dircount + buffer size.
1263 * We just make sure we make dircount big enough
1264 */
1265 *p++ = cpu_to_be32(args->count >> 3);
1266
1267 *p = cpu_to_be32(args->count);
1268 }
1269
1270 static void nfs3_xdr_enc_readdirplus3args(struct rpc_rqst *req,
1271 struct xdr_stream *xdr,
1272 const struct nfs3_readdirargs *args)
1273 {
1274 encode_readdirplus3args(xdr, args);
1275 prepare_reply_buffer(req, args->pages, 0,
1276 args->count, NFS3_readdirres_sz);
1277 }
1278
1279 /*
1280 * 3.3.21 COMMIT3args
1281 *
1282 * struct COMMIT3args {
1283 * nfs_fh3 file;
1284 * offset3 offset;
1285 * count3 count;
1286 * };
1287 */
1288 static void encode_commit3args(struct xdr_stream *xdr,
1289 const struct nfs_commitargs *args)
1290 {
1291 __be32 *p;
1292
1293 encode_nfs_fh3(xdr, args->fh);
1294
1295 p = xdr_reserve_space(xdr, 8 + 4);
1296 p = xdr_encode_hyper(p, args->offset);
1297 *p = cpu_to_be32(args->count);
1298 }
1299
1300 static void nfs3_xdr_enc_commit3args(struct rpc_rqst *req,
1301 struct xdr_stream *xdr,
1302 const struct nfs_commitargs *args)
1303 {
1304 encode_commit3args(xdr, args);
1305 }
1306
1307 #ifdef CONFIG_NFS_V3_ACL
1308
1309 static void nfs3_xdr_enc_getacl3args(struct rpc_rqst *req,
1310 struct xdr_stream *xdr,
1311 const struct nfs3_getaclargs *args)
1312 {
1313 encode_nfs_fh3(xdr, args->fh);
1314 encode_uint32(xdr, args->mask);
1315 if (args->mask & (NFS_ACL | NFS_DFACL))
1316 prepare_reply_buffer(req, args->pages, 0,
1317 NFSACL_MAXPAGES << PAGE_SHIFT,
1318 ACL3_getaclres_sz);
1319 }
1320
1321 static void nfs3_xdr_enc_setacl3args(struct rpc_rqst *req,
1322 struct xdr_stream *xdr,
1323 const struct nfs3_setaclargs *args)
1324 {
1325 unsigned int base;
1326 int error;
1327
1328 encode_nfs_fh3(xdr, NFS_FH(args->inode));
1329 encode_uint32(xdr, args->mask);
1330
1331 base = req->rq_slen;
1332 if (args->npages != 0)
1333 xdr_write_pages(xdr, args->pages, 0, args->len);
1334 else
1335 xdr_reserve_space(xdr, NFS_ACL_INLINE_BUFSIZE);
1336
1337 error = nfsacl_encode(xdr->buf, base, args->inode,
1338 (args->mask & NFS_ACL) ?
1339 args->acl_access : NULL, 1, 0);
1340 /* FIXME: this is just broken */
1341 BUG_ON(error < 0);
1342 error = nfsacl_encode(xdr->buf, base + error, args->inode,
1343 (args->mask & NFS_DFACL) ?
1344 args->acl_default : NULL, 1,
1345 NFS_ACL_DEFAULT);
1346 BUG_ON(error < 0);
1347 }
1348
1349 #endif /* CONFIG_NFS_V3_ACL */
1350
1351 /*
1352 * NFSv3 XDR decode functions
1353 *
1354 * NFSv3 result types are defined in section 3.3 of RFC 1813:
1355 * "NFS Version 3 Protocol Specification".
1356 */
1357
1358 /*
1359 * 3.3.1 GETATTR3res
1360 *
1361 * struct GETATTR3resok {
1362 * fattr3 obj_attributes;
1363 * };
1364 *
1365 * union GETATTR3res switch (nfsstat3 status) {
1366 * case NFS3_OK:
1367 * GETATTR3resok resok;
1368 * default:
1369 * void;
1370 * };
1371 */
1372 static int nfs3_xdr_dec_getattr3res(struct rpc_rqst *req,
1373 struct xdr_stream *xdr,
1374 struct nfs_fattr *result)
1375 {
1376 enum nfs_stat status;
1377 int error;
1378
1379 error = decode_nfsstat3(xdr, &status);
1380 if (unlikely(error))
1381 goto out;
1382 if (status != NFS3_OK)
1383 goto out_default;
1384 error = decode_fattr3(xdr, result);
1385 out:
1386 return error;
1387 out_default:
1388 return nfs3_stat_to_errno(status);
1389 }
1390
1391 /*
1392 * 3.3.2 SETATTR3res
1393 *
1394 * struct SETATTR3resok {
1395 * wcc_data obj_wcc;
1396 * };
1397 *
1398 * struct SETATTR3resfail {
1399 * wcc_data obj_wcc;
1400 * };
1401 *
1402 * union SETATTR3res switch (nfsstat3 status) {
1403 * case NFS3_OK:
1404 * SETATTR3resok resok;
1405 * default:
1406 * SETATTR3resfail resfail;
1407 * };
1408 */
1409 static int nfs3_xdr_dec_setattr3res(struct rpc_rqst *req,
1410 struct xdr_stream *xdr,
1411 struct nfs_fattr *result)
1412 {
1413 enum nfs_stat status;
1414 int error;
1415
1416 error = decode_nfsstat3(xdr, &status);
1417 if (unlikely(error))
1418 goto out;
1419 error = decode_wcc_data(xdr, result);
1420 if (unlikely(error))
1421 goto out;
1422 if (status != NFS3_OK)
1423 goto out_status;
1424 out:
1425 return error;
1426 out_status:
1427 return nfs3_stat_to_errno(status);
1428 }
1429
1430 /*
1431 * 3.3.3 LOOKUP3res
1432 *
1433 * struct LOOKUP3resok {
1434 * nfs_fh3 object;
1435 * post_op_attr obj_attributes;
1436 * post_op_attr dir_attributes;
1437 * };
1438 *
1439 * struct LOOKUP3resfail {
1440 * post_op_attr dir_attributes;
1441 * };
1442 *
1443 * union LOOKUP3res switch (nfsstat3 status) {
1444 * case NFS3_OK:
1445 * LOOKUP3resok resok;
1446 * default:
1447 * LOOKUP3resfail resfail;
1448 * };
1449 */
1450 static int nfs3_xdr_dec_lookup3res(struct rpc_rqst *req,
1451 struct xdr_stream *xdr,
1452 struct nfs3_diropres *result)
1453 {
1454 enum nfs_stat status;
1455 int error;
1456
1457 error = decode_nfsstat3(xdr, &status);
1458 if (unlikely(error))
1459 goto out;
1460 if (status != NFS3_OK)
1461 goto out_default;
1462 error = decode_nfs_fh3(xdr, result->fh);
1463 if (unlikely(error))
1464 goto out;
1465 error = decode_post_op_attr(xdr, result->fattr);
1466 if (unlikely(error))
1467 goto out;
1468 error = decode_post_op_attr(xdr, result->dir_attr);
1469 out:
1470 return error;
1471 out_default:
1472 error = decode_post_op_attr(xdr, result->dir_attr);
1473 if (unlikely(error))
1474 goto out;
1475 return nfs3_stat_to_errno(status);
1476 }
1477
1478 /*
1479 * 3.3.4 ACCESS3res
1480 *
1481 * struct ACCESS3resok {
1482 * post_op_attr obj_attributes;
1483 * uint32 access;
1484 * };
1485 *
1486 * struct ACCESS3resfail {
1487 * post_op_attr obj_attributes;
1488 * };
1489 *
1490 * union ACCESS3res switch (nfsstat3 status) {
1491 * case NFS3_OK:
1492 * ACCESS3resok resok;
1493 * default:
1494 * ACCESS3resfail resfail;
1495 * };
1496 */
1497 static int nfs3_xdr_dec_access3res(struct rpc_rqst *req,
1498 struct xdr_stream *xdr,
1499 struct nfs3_accessres *result)
1500 {
1501 enum nfs_stat status;
1502 int error;
1503
1504 error = decode_nfsstat3(xdr, &status);
1505 if (unlikely(error))
1506 goto out;
1507 error = decode_post_op_attr(xdr, result->fattr);
1508 if (unlikely(error))
1509 goto out;
1510 if (status != NFS3_OK)
1511 goto out_default;
1512 error = decode_uint32(xdr, &result->access);
1513 out:
1514 return error;
1515 out_default:
1516 return nfs3_stat_to_errno(status);
1517 }
1518
1519 /*
1520 * 3.3.5 READLINK3res
1521 *
1522 * struct READLINK3resok {
1523 * post_op_attr symlink_attributes;
1524 * nfspath3 data;
1525 * };
1526 *
1527 * struct READLINK3resfail {
1528 * post_op_attr symlink_attributes;
1529 * };
1530 *
1531 * union READLINK3res switch (nfsstat3 status) {
1532 * case NFS3_OK:
1533 * READLINK3resok resok;
1534 * default:
1535 * READLINK3resfail resfail;
1536 * };
1537 */
1538 static int nfs3_xdr_dec_readlink3res(struct rpc_rqst *req,
1539 struct xdr_stream *xdr,
1540 struct nfs_fattr *result)
1541 {
1542 enum nfs_stat status;
1543 int error;
1544
1545 error = decode_nfsstat3(xdr, &status);
1546 if (unlikely(error))
1547 goto out;
1548 error = decode_post_op_attr(xdr, result);
1549 if (unlikely(error))
1550 goto out;
1551 if (status != NFS3_OK)
1552 goto out_default;
1553 error = decode_nfspath3(xdr);
1554 out:
1555 return error;
1556 out_default:
1557 return nfs3_stat_to_errno(status);
1558 }
1559
1560 /*
1561 * 3.3.6 READ3res
1562 *
1563 * struct READ3resok {
1564 * post_op_attr file_attributes;
1565 * count3 count;
1566 * bool eof;
1567 * opaque data<>;
1568 * };
1569 *
1570 * struct READ3resfail {
1571 * post_op_attr file_attributes;
1572 * };
1573 *
1574 * union READ3res switch (nfsstat3 status) {
1575 * case NFS3_OK:
1576 * READ3resok resok;
1577 * default:
1578 * READ3resfail resfail;
1579 * };
1580 */
1581 static int decode_read3resok(struct xdr_stream *xdr,
1582 struct nfs_readres *result)
1583 {
1584 u32 eof, count, ocount, recvd;
1585 __be32 *p;
1586
1587 p = xdr_inline_decode(xdr, 4 + 4 + 4);
1588 if (unlikely(p == NULL))
1589 goto out_overflow;
1590 count = be32_to_cpup(p++);
1591 eof = be32_to_cpup(p++);
1592 ocount = be32_to_cpup(p++);
1593 if (unlikely(ocount != count))
1594 goto out_mismatch;
1595 recvd = xdr_read_pages(xdr, count);
1596 if (unlikely(count > recvd))
1597 goto out_cheating;
1598 out:
1599 result->eof = eof;
1600 result->count = count;
1601 return count;
1602 out_mismatch:
1603 dprintk("NFS: READ count doesn't match length of opaque: "
1604 "count %u != ocount %u\n", count, ocount);
1605 return -EIO;
1606 out_cheating:
1607 dprintk("NFS: server cheating in read result: "
1608 "count %u > recvd %u\n", count, recvd);
1609 count = recvd;
1610 eof = 0;
1611 goto out;
1612 out_overflow:
1613 print_overflow_msg(__func__, xdr);
1614 return -EIO;
1615 }
1616
1617 static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1618 struct nfs_readres *result)
1619 {
1620 enum nfs_stat status;
1621 int error;
1622
1623 error = decode_nfsstat3(xdr, &status);
1624 if (unlikely(error))
1625 goto out;
1626 error = decode_post_op_attr(xdr, result->fattr);
1627 if (unlikely(error))
1628 goto out;
1629 if (status != NFS3_OK)
1630 goto out_status;
1631 error = decode_read3resok(xdr, result);
1632 out:
1633 return error;
1634 out_status:
1635 return nfs3_stat_to_errno(status);
1636 }
1637
1638 /*
1639 * 3.3.7 WRITE3res
1640 *
1641 * enum stable_how {
1642 * UNSTABLE = 0,
1643 * DATA_SYNC = 1,
1644 * FILE_SYNC = 2
1645 * };
1646 *
1647 * struct WRITE3resok {
1648 * wcc_data file_wcc;
1649 * count3 count;
1650 * stable_how committed;
1651 * writeverf3 verf;
1652 * };
1653 *
1654 * struct WRITE3resfail {
1655 * wcc_data file_wcc;
1656 * };
1657 *
1658 * union WRITE3res switch (nfsstat3 status) {
1659 * case NFS3_OK:
1660 * WRITE3resok resok;
1661 * default:
1662 * WRITE3resfail resfail;
1663 * };
1664 */
1665 static int decode_write3resok(struct xdr_stream *xdr,
1666 struct nfs_writeres *result)
1667 {
1668 __be32 *p;
1669
1670 p = xdr_inline_decode(xdr, 4 + 4);
1671 if (unlikely(p == NULL))
1672 goto out_overflow;
1673 result->count = be32_to_cpup(p++);
1674 result->verf->committed = be32_to_cpup(p++);
1675 if (unlikely(result->verf->committed > NFS_FILE_SYNC))
1676 goto out_badvalue;
1677 if (decode_writeverf3(xdr, &result->verf->verifier))
1678 goto out_eio;
1679 return result->count;
1680 out_badvalue:
1681 dprintk("NFS: bad stable_how value: %u\n", result->verf->committed);
1682 return -EIO;
1683 out_overflow:
1684 print_overflow_msg(__func__, xdr);
1685 out_eio:
1686 return -EIO;
1687 }
1688
1689 static int nfs3_xdr_dec_write3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1690 struct nfs_writeres *result)
1691 {
1692 enum nfs_stat status;
1693 int error;
1694
1695 error = decode_nfsstat3(xdr, &status);
1696 if (unlikely(error))
1697 goto out;
1698 error = decode_wcc_data(xdr, result->fattr);
1699 if (unlikely(error))
1700 goto out;
1701 if (status != NFS3_OK)
1702 goto out_status;
1703 error = decode_write3resok(xdr, result);
1704 out:
1705 return error;
1706 out_status:
1707 return nfs3_stat_to_errno(status);
1708 }
1709
1710 /*
1711 * 3.3.8 CREATE3res
1712 *
1713 * struct CREATE3resok {
1714 * post_op_fh3 obj;
1715 * post_op_attr obj_attributes;
1716 * wcc_data dir_wcc;
1717 * };
1718 *
1719 * struct CREATE3resfail {
1720 * wcc_data dir_wcc;
1721 * };
1722 *
1723 * union CREATE3res switch (nfsstat3 status) {
1724 * case NFS3_OK:
1725 * CREATE3resok resok;
1726 * default:
1727 * CREATE3resfail resfail;
1728 * };
1729 */
1730 static int decode_create3resok(struct xdr_stream *xdr,
1731 struct nfs3_diropres *result)
1732 {
1733 int error;
1734
1735 error = decode_post_op_fh3(xdr, result->fh);
1736 if (unlikely(error))
1737 goto out;
1738 error = decode_post_op_attr(xdr, result->fattr);
1739 if (unlikely(error))
1740 goto out;
1741 /* The server isn't required to return a file handle.
1742 * If it didn't, force the client to perform a LOOKUP
1743 * to determine the correct file handle and attribute
1744 * values for the new object. */
1745 if (result->fh->size == 0)
1746 result->fattr->valid = 0;
1747 error = decode_wcc_data(xdr, result->dir_attr);
1748 out:
1749 return error;
1750 }
1751
1752 static int nfs3_xdr_dec_create3res(struct rpc_rqst *req,
1753 struct xdr_stream *xdr,
1754 struct nfs3_diropres *result)
1755 {
1756 enum nfs_stat status;
1757 int error;
1758
1759 error = decode_nfsstat3(xdr, &status);
1760 if (unlikely(error))
1761 goto out;
1762 if (status != NFS3_OK)
1763 goto out_default;
1764 error = decode_create3resok(xdr, result);
1765 out:
1766 return error;
1767 out_default:
1768 error = decode_wcc_data(xdr, result->dir_attr);
1769 if (unlikely(error))
1770 goto out;
1771 return nfs3_stat_to_errno(status);
1772 }
1773
1774 /*
1775 * 3.3.12 REMOVE3res
1776 *
1777 * struct REMOVE3resok {
1778 * wcc_data dir_wcc;
1779 * };
1780 *
1781 * struct REMOVE3resfail {
1782 * wcc_data dir_wcc;
1783 * };
1784 *
1785 * union REMOVE3res switch (nfsstat3 status) {
1786 * case NFS3_OK:
1787 * REMOVE3resok resok;
1788 * default:
1789 * REMOVE3resfail resfail;
1790 * };
1791 */
1792 static int nfs3_xdr_dec_remove3res(struct rpc_rqst *req,
1793 struct xdr_stream *xdr,
1794 struct nfs_removeres *result)
1795 {
1796 enum nfs_stat status;
1797 int error;
1798
1799 error = decode_nfsstat3(xdr, &status);
1800 if (unlikely(error))
1801 goto out;
1802 error = decode_wcc_data(xdr, result->dir_attr);
1803 if (unlikely(error))
1804 goto out;
1805 if (status != NFS3_OK)
1806 goto out_status;
1807 out:
1808 return error;
1809 out_status:
1810 return nfs3_stat_to_errno(status);
1811 }
1812
1813 /*
1814 * 3.3.14 RENAME3res
1815 *
1816 * struct RENAME3resok {
1817 * wcc_data fromdir_wcc;
1818 * wcc_data todir_wcc;
1819 * };
1820 *
1821 * struct RENAME3resfail {
1822 * wcc_data fromdir_wcc;
1823 * wcc_data todir_wcc;
1824 * };
1825 *
1826 * union RENAME3res switch (nfsstat3 status) {
1827 * case NFS3_OK:
1828 * RENAME3resok resok;
1829 * default:
1830 * RENAME3resfail resfail;
1831 * };
1832 */
1833 static int nfs3_xdr_dec_rename3res(struct rpc_rqst *req,
1834 struct xdr_stream *xdr,
1835 struct nfs_renameres *result)
1836 {
1837 enum nfs_stat status;
1838 int error;
1839
1840 error = decode_nfsstat3(xdr, &status);
1841 if (unlikely(error))
1842 goto out;
1843 error = decode_wcc_data(xdr, result->old_fattr);
1844 if (unlikely(error))
1845 goto out;
1846 error = decode_wcc_data(xdr, result->new_fattr);
1847 if (unlikely(error))
1848 goto out;
1849 if (status != NFS3_OK)
1850 goto out_status;
1851 out:
1852 return error;
1853 out_status:
1854 return nfs3_stat_to_errno(status);
1855 }
1856
1857 /*
1858 * 3.3.15 LINK3res
1859 *
1860 * struct LINK3resok {
1861 * post_op_attr file_attributes;
1862 * wcc_data linkdir_wcc;
1863 * };
1864 *
1865 * struct LINK3resfail {
1866 * post_op_attr file_attributes;
1867 * wcc_data linkdir_wcc;
1868 * };
1869 *
1870 * union LINK3res switch (nfsstat3 status) {
1871 * case NFS3_OK:
1872 * LINK3resok resok;
1873 * default:
1874 * LINK3resfail resfail;
1875 * };
1876 */
1877 static int nfs3_xdr_dec_link3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1878 struct nfs3_linkres *result)
1879 {
1880 enum nfs_stat status;
1881 int error;
1882
1883 error = decode_nfsstat3(xdr, &status);
1884 if (unlikely(error))
1885 goto out;
1886 error = decode_post_op_attr(xdr, result->fattr);
1887 if (unlikely(error))
1888 goto out;
1889 error = decode_wcc_data(xdr, result->dir_attr);
1890 if (unlikely(error))
1891 goto out;
1892 if (status != NFS3_OK)
1893 goto out_status;
1894 out:
1895 return error;
1896 out_status:
1897 return nfs3_stat_to_errno(status);
1898 }
1899
1900 /**
1901 * nfs3_decode_dirent - Decode a single NFSv3 directory entry stored in
1902 * the local page cache
1903 * @xdr: XDR stream where entry resides
1904 * @entry: buffer to fill in with entry data
1905 * @plus: boolean indicating whether this should be a readdirplus entry
1906 *
1907 * Returns zero if successful, otherwise a negative errno value is
1908 * returned.
1909 *
1910 * This function is not invoked during READDIR reply decoding, but
1911 * rather whenever an application invokes the getdents(2) system call
1912 * on a directory already in our cache.
1913 *
1914 * 3.3.16 entry3
1915 *
1916 * struct entry3 {
1917 * fileid3 fileid;
1918 * filename3 name;
1919 * cookie3 cookie;
1920 * fhandle3 filehandle;
1921 * post_op_attr3 attributes;
1922 * entry3 *nextentry;
1923 * };
1924 *
1925 * 3.3.17 entryplus3
1926 * struct entryplus3 {
1927 * fileid3 fileid;
1928 * filename3 name;
1929 * cookie3 cookie;
1930 * post_op_attr name_attributes;
1931 * post_op_fh3 name_handle;
1932 * entryplus3 *nextentry;
1933 * };
1934 */
1935 int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
1936 int plus)
1937 {
1938 struct nfs_entry old = *entry;
1939 __be32 *p;
1940 int error;
1941
1942 p = xdr_inline_decode(xdr, 4);
1943 if (unlikely(p == NULL))
1944 goto out_overflow;
1945 if (*p == xdr_zero) {
1946 p = xdr_inline_decode(xdr, 4);
1947 if (unlikely(p == NULL))
1948 goto out_overflow;
1949 if (*p == xdr_zero)
1950 return -EAGAIN;
1951 entry->eof = 1;
1952 return -EBADCOOKIE;
1953 }
1954
1955 error = decode_fileid3(xdr, &entry->ino);
1956 if (unlikely(error))
1957 return error;
1958
1959 error = decode_inline_filename3(xdr, &entry->name, &entry->len);
1960 if (unlikely(error))
1961 return error;
1962
1963 entry->prev_cookie = entry->cookie;
1964 error = decode_cookie3(xdr, &entry->cookie);
1965 if (unlikely(error))
1966 return error;
1967
1968 entry->d_type = DT_UNKNOWN;
1969
1970 if (plus) {
1971 entry->fattr->valid = 0;
1972 error = decode_post_op_attr(xdr, entry->fattr);
1973 if (unlikely(error))
1974 return error;
1975 if (entry->fattr->valid & NFS_ATTR_FATTR_V3)
1976 entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);
1977
1978 /* In fact, a post_op_fh3: */
1979 p = xdr_inline_decode(xdr, 4);
1980 if (unlikely(p == NULL))
1981 goto out_overflow;
1982 if (*p != xdr_zero) {
1983 error = decode_nfs_fh3(xdr, entry->fh);
1984 if (unlikely(error)) {
1985 if (error == -E2BIG)
1986 goto out_truncated;
1987 return error;
1988 }
1989 } else
1990 zero_nfs_fh3(entry->fh);
1991 }
1992
1993 return 0;
1994
1995 out_overflow:
1996 print_overflow_msg(__func__, xdr);
1997 return -EAGAIN;
1998 out_truncated:
1999 dprintk("NFS: directory entry contains invalid file handle\n");
2000 *entry = old;
2001 return -EAGAIN;
2002 }
2003
2004 /*
2005 * 3.3.16 READDIR3res
2006 *
2007 * struct dirlist3 {
2008 * entry3 *entries;
2009 * bool eof;
2010 * };
2011 *
2012 * struct READDIR3resok {
2013 * post_op_attr dir_attributes;
2014 * cookieverf3 cookieverf;
2015 * dirlist3 reply;
2016 * };
2017 *
2018 * struct READDIR3resfail {
2019 * post_op_attr dir_attributes;
2020 * };
2021 *
2022 * union READDIR3res switch (nfsstat3 status) {
2023 * case NFS3_OK:
2024 * READDIR3resok resok;
2025 * default:
2026 * READDIR3resfail resfail;
2027 * };
2028 *
2029 * Read the directory contents into the page cache, but otherwise
2030 * don't touch them. The actual decoding is done by nfs3_decode_entry()
2031 * during subsequent nfs_readdir() calls.
2032 */
2033 static int decode_dirlist3(struct xdr_stream *xdr)
2034 {
2035 return xdr_read_pages(xdr, xdr->buf->page_len);
2036 }
2037
2038 static int decode_readdir3resok(struct xdr_stream *xdr,
2039 struct nfs3_readdirres *result)
2040 {
2041 int error;
2042
2043 error = decode_post_op_attr(xdr, result->dir_attr);
2044 if (unlikely(error))
2045 goto out;
2046 /* XXX: do we need to check if result->verf != NULL ? */
2047 error = decode_cookieverf3(xdr, result->verf);
2048 if (unlikely(error))
2049 goto out;
2050 error = decode_dirlist3(xdr);
2051 out:
2052 return error;
2053 }
2054
2055 static int nfs3_xdr_dec_readdir3res(struct rpc_rqst *req,
2056 struct xdr_stream *xdr,
2057 struct nfs3_readdirres *result)
2058 {
2059 enum nfs_stat status;
2060 int error;
2061
2062 error = decode_nfsstat3(xdr, &status);
2063 if (unlikely(error))
2064 goto out;
2065 if (status != NFS3_OK)
2066 goto out_default;
2067 error = decode_readdir3resok(xdr, result);
2068 out:
2069 return error;
2070 out_default:
2071 error = decode_post_op_attr(xdr, result->dir_attr);
2072 if (unlikely(error))
2073 goto out;
2074 return nfs3_stat_to_errno(status);
2075 }
2076
2077 /*
2078 * 3.3.18 FSSTAT3res
2079 *
2080 * struct FSSTAT3resok {
2081 * post_op_attr obj_attributes;
2082 * size3 tbytes;
2083 * size3 fbytes;
2084 * size3 abytes;
2085 * size3 tfiles;
2086 * size3 ffiles;
2087 * size3 afiles;
2088 * uint32 invarsec;
2089 * };
2090 *
2091 * struct FSSTAT3resfail {
2092 * post_op_attr obj_attributes;
2093 * };
2094 *
2095 * union FSSTAT3res switch (nfsstat3 status) {
2096 * case NFS3_OK:
2097 * FSSTAT3resok resok;
2098 * default:
2099 * FSSTAT3resfail resfail;
2100 * };
2101 */
2102 static int decode_fsstat3resok(struct xdr_stream *xdr,
2103 struct nfs_fsstat *result)
2104 {
2105 __be32 *p;
2106
2107 p = xdr_inline_decode(xdr, 8 * 6 + 4);
2108 if (unlikely(p == NULL))
2109 goto out_overflow;
2110 p = xdr_decode_size3(p, &result->tbytes);
2111 p = xdr_decode_size3(p, &result->fbytes);
2112 p = xdr_decode_size3(p, &result->abytes);
2113 p = xdr_decode_size3(p, &result->tfiles);
2114 p = xdr_decode_size3(p, &result->ffiles);
2115 xdr_decode_size3(p, &result->afiles);
2116 /* ignore invarsec */
2117 return 0;
2118 out_overflow:
2119 print_overflow_msg(__func__, xdr);
2120 return -EIO;
2121 }
2122
2123 static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req,
2124 struct xdr_stream *xdr,
2125 struct nfs_fsstat *result)
2126 {
2127 enum nfs_stat status;
2128 int error;
2129
2130 error = decode_nfsstat3(xdr, &status);
2131 if (unlikely(error))
2132 goto out;
2133 error = decode_post_op_attr(xdr, result->fattr);
2134 if (unlikely(error))
2135 goto out;
2136 if (status != NFS3_OK)
2137 goto out_status;
2138 error = decode_fsstat3resok(xdr, result);
2139 out:
2140 return error;
2141 out_status:
2142 return nfs3_stat_to_errno(status);
2143 }
2144
2145 /*
2146 * 3.3.19 FSINFO3res
2147 *
2148 * struct FSINFO3resok {
2149 * post_op_attr obj_attributes;
2150 * uint32 rtmax;
2151 * uint32 rtpref;
2152 * uint32 rtmult;
2153 * uint32 wtmax;
2154 * uint32 wtpref;
2155 * uint32 wtmult;
2156 * uint32 dtpref;
2157 * size3 maxfilesize;
2158 * nfstime3 time_delta;
2159 * uint32 properties;
2160 * };
2161 *
2162 * struct FSINFO3resfail {
2163 * post_op_attr obj_attributes;
2164 * };
2165 *
2166 * union FSINFO3res switch (nfsstat3 status) {
2167 * case NFS3_OK:
2168 * FSINFO3resok resok;
2169 * default:
2170 * FSINFO3resfail resfail;
2171 * };
2172 */
2173 static int decode_fsinfo3resok(struct xdr_stream *xdr,
2174 struct nfs_fsinfo *result)
2175 {
2176 __be32 *p;
2177
2178 p = xdr_inline_decode(xdr, 4 * 7 + 8 + 8 + 4);
2179 if (unlikely(p == NULL))
2180 goto out_overflow;
2181 result->rtmax = be32_to_cpup(p++);
2182 result->rtpref = be32_to_cpup(p++);
2183 result->rtmult = be32_to_cpup(p++);
2184 result->wtmax = be32_to_cpup(p++);
2185 result->wtpref = be32_to_cpup(p++);
2186 result->wtmult = be32_to_cpup(p++);
2187 result->dtpref = be32_to_cpup(p++);
2188 p = xdr_decode_size3(p, &result->maxfilesize);
2189 xdr_decode_nfstime3(p, &result->time_delta);
2190
2191 /* ignore properties */
2192 result->lease_time = 0;
2193 return 0;
2194 out_overflow:
2195 print_overflow_msg(__func__, xdr);
2196 return -EIO;
2197 }
2198
2199 static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req,
2200 struct xdr_stream *xdr,
2201 struct nfs_fsinfo *result)
2202 {
2203 enum nfs_stat status;
2204 int error;
2205
2206 error = decode_nfsstat3(xdr, &status);
2207 if (unlikely(error))
2208 goto out;
2209 error = decode_post_op_attr(xdr, result->fattr);
2210 if (unlikely(error))
2211 goto out;
2212 if (status != NFS3_OK)
2213 goto out_status;
2214 error = decode_fsinfo3resok(xdr, result);
2215 out:
2216 return error;
2217 out_status:
2218 return nfs3_stat_to_errno(status);
2219 }
2220
2221 /*
2222 * 3.3.20 PATHCONF3res
2223 *
2224 * struct PATHCONF3resok {
2225 * post_op_attr obj_attributes;
2226 * uint32 linkmax;
2227 * uint32 name_max;
2228 * bool no_trunc;
2229 * bool chown_restricted;
2230 * bool case_insensitive;
2231 * bool case_preserving;
2232 * };
2233 *
2234 * struct PATHCONF3resfail {
2235 * post_op_attr obj_attributes;
2236 * };
2237 *
2238 * union PATHCONF3res switch (nfsstat3 status) {
2239 * case NFS3_OK:
2240 * PATHCONF3resok resok;
2241 * default:
2242 * PATHCONF3resfail resfail;
2243 * };
2244 */
2245 static int decode_pathconf3resok(struct xdr_stream *xdr,
2246 struct nfs_pathconf *result)
2247 {
2248 __be32 *p;
2249
2250 p = xdr_inline_decode(xdr, 4 * 6);
2251 if (unlikely(p == NULL))
2252 goto out_overflow;
2253 result->max_link = be32_to_cpup(p++);
2254 result->max_namelen = be32_to_cpup(p);
2255 /* ignore remaining fields */
2256 return 0;
2257 out_overflow:
2258 print_overflow_msg(__func__, xdr);
2259 return -EIO;
2260 }
2261
2262 static int nfs3_xdr_dec_pathconf3res(struct rpc_rqst *req,
2263 struct xdr_stream *xdr,
2264 struct nfs_pathconf *result)
2265 {
2266 enum nfs_stat status;
2267 int error;
2268
2269 error = decode_nfsstat3(xdr, &status);
2270 if (unlikely(error))
2271 goto out;
2272 error = decode_post_op_attr(xdr, result->fattr);
2273 if (unlikely(error))
2274 goto out;
2275 if (status != NFS3_OK)
2276 goto out_status;
2277 error = decode_pathconf3resok(xdr, result);
2278 out:
2279 return error;
2280 out_status:
2281 return nfs3_stat_to_errno(status);
2282 }
2283
2284 /*
2285 * 3.3.21 COMMIT3res
2286 *
2287 * struct COMMIT3resok {
2288 * wcc_data file_wcc;
2289 * writeverf3 verf;
2290 * };
2291 *
2292 * struct COMMIT3resfail {
2293 * wcc_data file_wcc;
2294 * };
2295 *
2296 * union COMMIT3res switch (nfsstat3 status) {
2297 * case NFS3_OK:
2298 * COMMIT3resok resok;
2299 * default:
2300 * COMMIT3resfail resfail;
2301 * };
2302 */
2303 static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req,
2304 struct xdr_stream *xdr,
2305 struct nfs_commitres *result)
2306 {
2307 enum nfs_stat status;
2308 int error;
2309
2310 error = decode_nfsstat3(xdr, &status);
2311 if (unlikely(error))
2312 goto out;
2313 error = decode_wcc_data(xdr, result->fattr);
2314 if (unlikely(error))
2315 goto out;
2316 if (status != NFS3_OK)
2317 goto out_status;
2318 error = decode_writeverf3(xdr, &result->verf->verifier);
2319 out:
2320 return error;
2321 out_status:
2322 return nfs3_stat_to_errno(status);
2323 }
2324
2325 #ifdef CONFIG_NFS_V3_ACL
2326
2327 static inline int decode_getacl3resok(struct xdr_stream *xdr,
2328 struct nfs3_getaclres *result)
2329 {
2330 struct posix_acl **acl;
2331 unsigned int *aclcnt;
2332 size_t hdrlen;
2333 int error;
2334
2335 error = decode_post_op_attr(xdr, result->fattr);
2336 if (unlikely(error))
2337 goto out;
2338 error = decode_uint32(xdr, &result->mask);
2339 if (unlikely(error))
2340 goto out;
2341 error = -EINVAL;
2342 if (result->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
2343 goto out;
2344
2345 hdrlen = xdr_stream_pos(xdr);
2346
2347 acl = NULL;
2348 if (result->mask & NFS_ACL)
2349 acl = &result->acl_access;
2350 aclcnt = NULL;
2351 if (result->mask & NFS_ACLCNT)
2352 aclcnt = &result->acl_access_count;
2353 error = nfsacl_decode(xdr->buf, hdrlen, aclcnt, acl);
2354 if (unlikely(error <= 0))
2355 goto out;
2356
2357 acl = NULL;
2358 if (result->mask & NFS_DFACL)
2359 acl = &result->acl_default;
2360 aclcnt = NULL;
2361 if (result->mask & NFS_DFACLCNT)
2362 aclcnt = &result->acl_default_count;
2363 error = nfsacl_decode(xdr->buf, hdrlen + error, aclcnt, acl);
2364 if (unlikely(error <= 0))
2365 return error;
2366 error = 0;
2367 out:
2368 return error;
2369 }
2370
2371 static int nfs3_xdr_dec_getacl3res(struct rpc_rqst *req,
2372 struct xdr_stream *xdr,
2373 struct nfs3_getaclres *result)
2374 {
2375 enum nfs_stat status;
2376 int error;
2377
2378 error = decode_nfsstat3(xdr, &status);
2379 if (unlikely(error))
2380 goto out;
2381 if (status != NFS3_OK)
2382 goto out_default;
2383 error = decode_getacl3resok(xdr, result);
2384 out:
2385 return error;
2386 out_default:
2387 return nfs3_stat_to_errno(status);
2388 }
2389
2390 static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req,
2391 struct xdr_stream *xdr,
2392 struct nfs_fattr *result)
2393 {
2394 enum nfs_stat status;
2395 int error;
2396
2397 error = decode_nfsstat3(xdr, &status);
2398 if (unlikely(error))
2399 goto out;
2400 if (status != NFS3_OK)
2401 goto out_default;
2402 error = decode_post_op_attr(xdr, result);
2403 out:
2404 return error;
2405 out_default:
2406 return nfs3_stat_to_errno(status);
2407 }
2408
2409 #endif /* CONFIG_NFS_V3_ACL */
2410
2411
2412 /*
2413 * We need to translate between nfs status return values and
2414 * the local errno values which may not be the same.
2415 */
2416 static const struct {
2417 int stat;
2418 int errno;
2419 } nfs_errtbl[] = {
2420 { NFS_OK, 0 },
2421 { NFSERR_PERM, -EPERM },
2422 { NFSERR_NOENT, -ENOENT },
2423 { NFSERR_IO, -errno_NFSERR_IO},
2424 { NFSERR_NXIO, -ENXIO },
2425 /* { NFSERR_EAGAIN, -EAGAIN }, */
2426 { NFSERR_ACCES, -EACCES },
2427 { NFSERR_EXIST, -EEXIST },
2428 { NFSERR_XDEV, -EXDEV },
2429 { NFSERR_NODEV, -ENODEV },
2430 { NFSERR_NOTDIR, -ENOTDIR },
2431 { NFSERR_ISDIR, -EISDIR },
2432 { NFSERR_INVAL, -EINVAL },
2433 { NFSERR_FBIG, -EFBIG },
2434 { NFSERR_NOSPC, -ENOSPC },
2435 { NFSERR_ROFS, -EROFS },
2436 { NFSERR_MLINK, -EMLINK },
2437 { NFSERR_NAMETOOLONG, -ENAMETOOLONG },
2438 { NFSERR_NOTEMPTY, -ENOTEMPTY },
2439 { NFSERR_DQUOT, -EDQUOT },
2440 { NFSERR_STALE, -ESTALE },
2441 { NFSERR_REMOTE, -EREMOTE },
2442 #ifdef EWFLUSH
2443 { NFSERR_WFLUSH, -EWFLUSH },
2444 #endif
2445 { NFSERR_BADHANDLE, -EBADHANDLE },
2446 { NFSERR_NOT_SYNC, -ENOTSYNC },
2447 { NFSERR_BAD_COOKIE, -EBADCOOKIE },
2448 { NFSERR_NOTSUPP, -ENOTSUPP },
2449 { NFSERR_TOOSMALL, -ETOOSMALL },
2450 { NFSERR_SERVERFAULT, -EREMOTEIO },
2451 { NFSERR_BADTYPE, -EBADTYPE },
2452 { NFSERR_JUKEBOX, -EJUKEBOX },
2453 { -1, -EIO }
2454 };
2455
2456 /**
2457 * nfs3_stat_to_errno - convert an NFS status code to a local errno
2458 * @status: NFS status code to convert
2459 *
2460 * Returns a local errno value, or -EIO if the NFS status code is
2461 * not recognized. This function is used jointly by NFSv2 and NFSv3.
2462 */
2463 static int nfs3_stat_to_errno(enum nfs_stat status)
2464 {
2465 int i;
2466
2467 for (i = 0; nfs_errtbl[i].stat != -1; i++) {
2468 if (nfs_errtbl[i].stat == (int)status)
2469 return nfs_errtbl[i].errno;
2470 }
2471 dprintk("NFS: Unrecognized nfs status value: %u\n", status);
2472 return nfs_errtbl[i].errno;
2473 }
2474
2475
2476 #define PROC(proc, argtype, restype, timer) \
2477 [NFS3PROC_##proc] = { \
2478 .p_proc = NFS3PROC_##proc, \
2479 .p_encode = (kxdreproc_t)nfs3_xdr_enc_##argtype##3args, \
2480 .p_decode = (kxdrdproc_t)nfs3_xdr_dec_##restype##3res, \
2481 .p_arglen = NFS3_##argtype##args_sz, \
2482 .p_replen = NFS3_##restype##res_sz, \
2483 .p_timer = timer, \
2484 .p_statidx = NFS3PROC_##proc, \
2485 .p_name = #proc, \
2486 }
2487
2488 struct rpc_procinfo nfs3_procedures[] = {
2489 PROC(GETATTR, getattr, getattr, 1),
2490 PROC(SETATTR, setattr, setattr, 0),
2491 PROC(LOOKUP, lookup, lookup, 2),
2492 PROC(ACCESS, access, access, 1),
2493 PROC(READLINK, readlink, readlink, 3),
2494 PROC(READ, read, read, 3),
2495 PROC(WRITE, write, write, 4),
2496 PROC(CREATE, create, create, 0),
2497 PROC(MKDIR, mkdir, create, 0),
2498 PROC(SYMLINK, symlink, create, 0),
2499 PROC(MKNOD, mknod, create, 0),
2500 PROC(REMOVE, remove, remove, 0),
2501 PROC(RMDIR, lookup, setattr, 0),
2502 PROC(RENAME, rename, rename, 0),
2503 PROC(LINK, link, link, 0),
2504 PROC(READDIR, readdir, readdir, 3),
2505 PROC(READDIRPLUS, readdirplus, readdir, 3),
2506 PROC(FSSTAT, getattr, fsstat, 0),
2507 PROC(FSINFO, getattr, fsinfo, 0),
2508 PROC(PATHCONF, getattr, pathconf, 0),
2509 PROC(COMMIT, commit, commit, 5),
2510 };
2511
2512 const struct rpc_version nfs_version3 = {
2513 .number = 3,
2514 .nrprocs = ARRAY_SIZE(nfs3_procedures),
2515 .procs = nfs3_procedures
2516 };
2517
2518 #ifdef CONFIG_NFS_V3_ACL
2519 static struct rpc_procinfo nfs3_acl_procedures[] = {
2520 [ACLPROC3_GETACL] = {
2521 .p_proc = ACLPROC3_GETACL,
2522 .p_encode = (kxdreproc_t)nfs3_xdr_enc_getacl3args,
2523 .p_decode = (kxdrdproc_t)nfs3_xdr_dec_getacl3res,
2524 .p_arglen = ACL3_getaclargs_sz,
2525 .p_replen = ACL3_getaclres_sz,
2526 .p_timer = 1,
2527 .p_name = "GETACL",
2528 },
2529 [ACLPROC3_SETACL] = {
2530 .p_proc = ACLPROC3_SETACL,
2531 .p_encode = (kxdreproc_t)nfs3_xdr_enc_setacl3args,
2532 .p_decode = (kxdrdproc_t)nfs3_xdr_dec_setacl3res,
2533 .p_arglen = ACL3_setaclargs_sz,
2534 .p_replen = ACL3_setaclres_sz,
2535 .p_timer = 0,
2536 .p_name = "SETACL",
2537 },
2538 };
2539
2540 const struct rpc_version nfsacl_version3 = {
2541 .number = 3,
2542 .nrprocs = sizeof(nfs3_acl_procedures)/
2543 sizeof(nfs3_acl_procedures[0]),
2544 .procs = nfs3_acl_procedures,
2545 };
2546 #endif /* CONFIG_NFS_V3_ACL */
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