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staging: msm/lcdc.c: Convert IS_ERR result to PTR_ERR
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / nfs / nfs3xdr.c
blob01c5e8b1941d2faea2732a181b1bec1fcdd85302
1 /*
2 * linux/fs/nfs/nfs3xdr.c
3 *
4 * XDR functions to encode/decode NFSv3 RPC arguments and results.
5 *
6 * Copyright (C) 1996, 1997 Olaf Kirch
7 */
8
9 #include <linux/param.h>
10 #include <linux/time.h>
11 #include <linux/mm.h>
12 #include <linux/errno.h>
13 #include <linux/string.h>
14 #include <linux/in.h>
15 #include <linux/pagemap.h>
16 #include <linux/proc_fs.h>
17 #include <linux/kdev_t.h>
18 #include <linux/sunrpc/clnt.h>
19 #include <linux/nfs.h>
20 #include <linux/nfs3.h>
21 #include <linux/nfs_fs.h>
22 #include <linux/nfsacl.h>
23 #include "internal.h"
24
25 #define NFSDBG_FACILITY NFSDBG_XDR
26
27 /* Mapping from NFS error code to "errno" error code. */
28 #define errno_NFSERR_IO EIO
29
30 /*
31 * Declare the space requirements for NFS arguments and replies as
32 * number of 32bit-words
33 */
34 #define NFS3_fhandle_sz (1+16)
35 #define NFS3_fh_sz (NFS3_fhandle_sz) /* shorthand */
36 #define NFS3_sattr_sz (15)
37 #define NFS3_filename_sz (1+(NFS3_MAXNAMLEN>>2))
38 #define NFS3_path_sz (1+(NFS3_MAXPATHLEN>>2))
39 #define NFS3_fattr_sz (21)
40 #define NFS3_cookieverf_sz (NFS3_COOKIEVERFSIZE>>2)
41 #define NFS3_wcc_attr_sz (6)
42 #define NFS3_pre_op_attr_sz (1+NFS3_wcc_attr_sz)
43 #define NFS3_post_op_attr_sz (1+NFS3_fattr_sz)
44 #define NFS3_wcc_data_sz (NFS3_pre_op_attr_sz+NFS3_post_op_attr_sz)
45 #define NFS3_diropargs_sz (NFS3_fh_sz+NFS3_filename_sz)
46
47 #define NFS3_getattrargs_sz (NFS3_fh_sz)
48 #define NFS3_setattrargs_sz (NFS3_fh_sz+NFS3_sattr_sz+3)
49 #define NFS3_lookupargs_sz (NFS3_fh_sz+NFS3_filename_sz)
50 #define NFS3_accessargs_sz (NFS3_fh_sz+1)
51 #define NFS3_readlinkargs_sz (NFS3_fh_sz)
52 #define NFS3_readargs_sz (NFS3_fh_sz+3)
53 #define NFS3_writeargs_sz (NFS3_fh_sz+5)
54 #define NFS3_createargs_sz (NFS3_diropargs_sz+NFS3_sattr_sz)
55 #define NFS3_mkdirargs_sz (NFS3_diropargs_sz+NFS3_sattr_sz)
56 #define NFS3_symlinkargs_sz (NFS3_diropargs_sz+1+NFS3_sattr_sz)
57 #define NFS3_mknodargs_sz (NFS3_diropargs_sz+2+NFS3_sattr_sz)
58 #define NFS3_removeargs_sz (NFS3_fh_sz+NFS3_filename_sz)
59 #define NFS3_renameargs_sz (NFS3_diropargs_sz+NFS3_diropargs_sz)
60 #define NFS3_linkargs_sz (NFS3_fh_sz+NFS3_diropargs_sz)
61 #define NFS3_readdirargs_sz (NFS3_fh_sz+NFS3_cookieverf_sz+3)
62 #define NFS3_readdirplusargs_sz (NFS3_fh_sz+NFS3_cookieverf_sz+4)
63 #define NFS3_commitargs_sz (NFS3_fh_sz+3)
64
65 #define NFS3_getattrres_sz (1+NFS3_fattr_sz)
66 #define NFS3_setattrres_sz (1+NFS3_wcc_data_sz)
67 #define NFS3_removeres_sz (NFS3_setattrres_sz)
68 #define NFS3_lookupres_sz (1+NFS3_fh_sz+(2 * NFS3_post_op_attr_sz))
69 #define NFS3_accessres_sz (1+NFS3_post_op_attr_sz+1)
70 #define NFS3_readlinkres_sz (1+NFS3_post_op_attr_sz+1)
71 #define NFS3_readres_sz (1+NFS3_post_op_attr_sz+3)
72 #define NFS3_writeres_sz (1+NFS3_wcc_data_sz+4)
73 #define NFS3_createres_sz (1+NFS3_fh_sz+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
74 #define NFS3_renameres_sz (1+(2 * NFS3_wcc_data_sz))
75 #define NFS3_linkres_sz (1+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
76 #define NFS3_readdirres_sz (1+NFS3_post_op_attr_sz+2)
77 #define NFS3_fsstatres_sz (1+NFS3_post_op_attr_sz+13)
78 #define NFS3_fsinfores_sz (1+NFS3_post_op_attr_sz+12)
79 #define NFS3_pathconfres_sz (1+NFS3_post_op_attr_sz+6)
80 #define NFS3_commitres_sz (1+NFS3_wcc_data_sz+2)
81
82 #define ACL3_getaclargs_sz (NFS3_fh_sz+1)
83 #define ACL3_setaclargs_sz (NFS3_fh_sz+1+ \
84 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
85 #define ACL3_getaclres_sz (1+NFS3_post_op_attr_sz+1+ \
86 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
87 #define ACL3_setaclres_sz (1+NFS3_post_op_attr_sz)
88
89 /*
90 * Map file type to S_IFMT bits
91 */
92 static const umode_t nfs_type2fmt[] = {
93 [NF3BAD] = 0,
94 [NF3REG] = S_IFREG,
95 [NF3DIR] = S_IFDIR,
96 [NF3BLK] = S_IFBLK,
97 [NF3CHR] = S_IFCHR,
98 [NF3LNK] = S_IFLNK,
99 [NF3SOCK] = S_IFSOCK,
100 [NF3FIFO] = S_IFIFO,
101 };
102
103 /*
104 * While encoding arguments, set up the reply buffer in advance to
105 * receive reply data directly into the page cache.
106 */
107 static void prepare_reply_buffer(struct rpc_rqst *req, struct page **pages,
108 unsigned int base, unsigned int len,
109 unsigned int bufsize)
110 {
111 struct rpc_auth *auth = req->rq_cred->cr_auth;
112 unsigned int replen;
113
114 replen = RPC_REPHDRSIZE + auth->au_rslack + bufsize;
115 xdr_inline_pages(&req->rq_rcv_buf, replen << 2, pages, base, len);
116 }
117
118 /*
119 * Handle decode buffer overflows out-of-line.
120 */
121 static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
122 {
123 dprintk("NFS: %s prematurely hit the end of our receive buffer. "
124 "Remaining buffer length is %tu words.\n",
125 func, xdr->end - xdr->p);
126 }
127
128
129 /*
130 * Encode/decode NFSv3 basic data types
131 *
132 * Basic NFSv3 data types are defined in section 2.5 of RFC 1813:
133 * "NFS Version 3 Protocol Specification".
134 *
135 * Not all basic data types have their own encoding and decoding
136 * functions. For run-time efficiency, some data types are encoded
137 * or decoded inline.
138 */
139
140 static void encode_uint32(struct xdr_stream *xdr, u32 value)
141 {
142 __be32 *p = xdr_reserve_space(xdr, 4);
143 *p = cpu_to_be32(value);
144 }
145
146 static int decode_uint32(struct xdr_stream *xdr, u32 *value)
147 {
148 __be32 *p;
149
150 p = xdr_inline_decode(xdr, 4);
151 if (unlikely(p == NULL))
152 goto out_overflow;
153 *value = be32_to_cpup(p);
154 return 0;
155 out_overflow:
156 print_overflow_msg(__func__, xdr);
157 return -EIO;
158 }
159
160 static int decode_uint64(struct xdr_stream *xdr, u64 *value)
161 {
162 __be32 *p;
163
164 p = xdr_inline_decode(xdr, 8);
165 if (unlikely(p == NULL))
166 goto out_overflow;
167 xdr_decode_hyper(p, value);
168 return 0;
169 out_overflow:
170 print_overflow_msg(__func__, xdr);
171 return -EIO;
172 }
173
174 /*
175 * fileid3
176 *
177 * typedef uint64 fileid3;
178 */
179 static __be32 *xdr_decode_fileid3(__be32 *p, u64 *fileid)
180 {
181 return xdr_decode_hyper(p, fileid);
182 }
183
184 static int decode_fileid3(struct xdr_stream *xdr, u64 *fileid)
185 {
186 return decode_uint64(xdr, fileid);
187 }
188
189 /*
190 * filename3
191 *
192 * typedef string filename3<>;
193 */
194 static void encode_filename3(struct xdr_stream *xdr,
195 const char *name, u32 length)
196 {
197 __be32 *p;
198
199 BUG_ON(length > NFS3_MAXNAMLEN);
200 p = xdr_reserve_space(xdr, 4 + length);
201 xdr_encode_opaque(p, name, length);
202 }
203
204 static int decode_inline_filename3(struct xdr_stream *xdr,
205 const char **name, u32 *length)
206 {
207 __be32 *p;
208 u32 count;
209
210 p = xdr_inline_decode(xdr, 4);
211 if (unlikely(p == NULL))
212 goto out_overflow;
213 count = be32_to_cpup(p);
214 if (count > NFS3_MAXNAMLEN)
215 goto out_nametoolong;
216 p = xdr_inline_decode(xdr, count);
217 if (unlikely(p == NULL))
218 goto out_overflow;
219 *name = (const char *)p;
220 *length = count;
221 return 0;
222
223 out_nametoolong:
224 dprintk("NFS: returned filename too long: %u\n", count);
225 return -ENAMETOOLONG;
226 out_overflow:
227 print_overflow_msg(__func__, xdr);
228 return -EIO;
229 }
230
231 /*
232 * nfspath3
233 *
234 * typedef string nfspath3<>;
235 */
236 static void encode_nfspath3(struct xdr_stream *xdr, struct page **pages,
237 const u32 length)
238 {
239 BUG_ON(length > NFS3_MAXPATHLEN);
240 encode_uint32(xdr, length);
241 xdr_write_pages(xdr, pages, 0, length);
242 }
243
244 static int decode_nfspath3(struct xdr_stream *xdr)
245 {
246 u32 recvd, count;
247 size_t hdrlen;
248 __be32 *p;
249
250 p = xdr_inline_decode(xdr, 4);
251 if (unlikely(p == NULL))
252 goto out_overflow;
253 count = be32_to_cpup(p);
254 if (unlikely(count >= xdr->buf->page_len || count > NFS3_MAXPATHLEN))
255 goto out_nametoolong;
256 hdrlen = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base;
257 recvd = xdr->buf->len - hdrlen;
258 if (unlikely(count > recvd))
259 goto out_cheating;
260
261 xdr_read_pages(xdr, count);
262 xdr_terminate_string(xdr->buf, count);
263 return 0;
264
265 out_nametoolong:
266 dprintk("NFS: returned pathname too long: %u\n", count);
267 return -ENAMETOOLONG;
268 out_cheating:
269 dprintk("NFS: server cheating in pathname result: "
270 "count %u > recvd %u\n", count, recvd);
271 return -EIO;
272 out_overflow:
273 print_overflow_msg(__func__, xdr);
274 return -EIO;
275 }
276
277 /*
278 * cookie3
279 *
280 * typedef uint64 cookie3
281 */
282 static __be32 *xdr_encode_cookie3(__be32 *p, u64 cookie)
283 {
284 return xdr_encode_hyper(p, cookie);
285 }
286
287 static int decode_cookie3(struct xdr_stream *xdr, u64 *cookie)
288 {
289 return decode_uint64(xdr, cookie);
290 }
291
292 /*
293 * cookieverf3
294 *
295 * typedef opaque cookieverf3[NFS3_COOKIEVERFSIZE];
296 */
297 static __be32 *xdr_encode_cookieverf3(__be32 *p, const __be32 *verifier)
298 {
299 memcpy(p, verifier, NFS3_COOKIEVERFSIZE);
300 return p + XDR_QUADLEN(NFS3_COOKIEVERFSIZE);
301 }
302
303 static int decode_cookieverf3(struct xdr_stream *xdr, __be32 *verifier)
304 {
305 __be32 *p;
306
307 p = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE);
308 if (unlikely(p == NULL))
309 goto out_overflow;
310 memcpy(verifier, p, NFS3_COOKIEVERFSIZE);
311 return 0;
312 out_overflow:
313 print_overflow_msg(__func__, xdr);
314 return -EIO;
315 }
316
317 /*
318 * createverf3
319 *
320 * typedef opaque createverf3[NFS3_CREATEVERFSIZE];
321 */
322 static void encode_createverf3(struct xdr_stream *xdr, const __be32 *verifier)
323 {
324 __be32 *p;
325
326 p = xdr_reserve_space(xdr, NFS3_CREATEVERFSIZE);
327 memcpy(p, verifier, NFS3_CREATEVERFSIZE);
328 }
329
330 static int decode_writeverf3(struct xdr_stream *xdr, __be32 *verifier)
331 {
332 __be32 *p;
333
334 p = xdr_inline_decode(xdr, NFS3_WRITEVERFSIZE);
335 if (unlikely(p == NULL))
336 goto out_overflow;
337 memcpy(verifier, p, NFS3_WRITEVERFSIZE);
338 return 0;
339 out_overflow:
340 print_overflow_msg(__func__, xdr);
341 return -EIO;
342 }
343
344 /*
345 * size3
346 *
347 * typedef uint64 size3;
348 */
349 static __be32 *xdr_decode_size3(__be32 *p, u64 *size)
350 {
351 return xdr_decode_hyper(p, size);
352 }
353
354 /*
355 * nfsstat3
356 *
357 * enum nfsstat3 {
358 * NFS3_OK = 0,
359 * ...
360 * }
361 */
362 #define NFS3_OK NFS_OK
363
364 static int decode_nfsstat3(struct xdr_stream *xdr, enum nfs_stat *status)
365 {
366 __be32 *p;
367
368 p = xdr_inline_decode(xdr, 4);
369 if (unlikely(p == NULL))
370 goto out_overflow;
371 *status = be32_to_cpup(p);
372 return 0;
373 out_overflow:
374 print_overflow_msg(__func__, xdr);
375 return -EIO;
376 }
377
378 /*
379 * ftype3
380 *
381 * enum ftype3 {
382 * NF3REG = 1,
383 * NF3DIR = 2,
384 * NF3BLK = 3,
385 * NF3CHR = 4,
386 * NF3LNK = 5,
387 * NF3SOCK = 6,
388 * NF3FIFO = 7
389 * };
390 */
391 static void encode_ftype3(struct xdr_stream *xdr, const u32 type)
392 {
393 BUG_ON(type > NF3FIFO);
394 encode_uint32(xdr, type);
395 }
396
397 static __be32 *xdr_decode_ftype3(__be32 *p, umode_t *mode)
398 {
399 u32 type;
400
401 type = be32_to_cpup(p++);
402 if (type > NF3FIFO)
403 type = NF3NON;
404 *mode = nfs_type2fmt[type];
405 return p;
406 }
407
408 /*
409 * specdata3
410 *
411 * struct specdata3 {
412 * uint32 specdata1;
413 * uint32 specdata2;
414 * };
415 */
416 static void encode_specdata3(struct xdr_stream *xdr, const dev_t rdev)
417 {
418 __be32 *p;
419
420 p = xdr_reserve_space(xdr, 8);
421 *p++ = cpu_to_be32(MAJOR(rdev));
422 *p = cpu_to_be32(MINOR(rdev));
423 }
424
425 static __be32 *xdr_decode_specdata3(__be32 *p, dev_t *rdev)
426 {
427 unsigned int major, minor;
428
429 major = be32_to_cpup(p++);
430 minor = be32_to_cpup(p++);
431 *rdev = MKDEV(major, minor);
432 if (MAJOR(*rdev) != major || MINOR(*rdev) != minor)
433 *rdev = 0;
434 return p;
435 }
436
437 /*
438 * nfs_fh3
439 *
440 * struct nfs_fh3 {
441 * opaque data<NFS3_FHSIZE>;
442 * };
443 */
444 static void encode_nfs_fh3(struct xdr_stream *xdr, const struct nfs_fh *fh)
445 {
446 __be32 *p;
447
448 BUG_ON(fh->size > NFS3_FHSIZE);
449 p = xdr_reserve_space(xdr, 4 + fh->size);
450 xdr_encode_opaque(p, fh->data, fh->size);
451 }
452
453 static int decode_nfs_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
454 {
455 u32 length;
456 __be32 *p;
457
458 p = xdr_inline_decode(xdr, 4);
459 if (unlikely(p == NULL))
460 goto out_overflow;
461 length = be32_to_cpup(p++);
462 if (unlikely(length > NFS3_FHSIZE))
463 goto out_toobig;
464 p = xdr_inline_decode(xdr, length);
465 if (unlikely(p == NULL))
466 goto out_overflow;
467 fh->size = length;
468 memcpy(fh->data, p, length);
469 return 0;
470 out_toobig:
471 dprintk("NFS: file handle size (%u) too big\n", length);
472 return -E2BIG;
473 out_overflow:
474 print_overflow_msg(__func__, xdr);
475 return -EIO;
476 }
477
478 static void zero_nfs_fh3(struct nfs_fh *fh)
479 {
480 memset(fh, 0, sizeof(*fh));
481 }
482
483 /*
484 * nfstime3
485 *
486 * struct nfstime3 {
487 * uint32 seconds;
488 * uint32 nseconds;
489 * };
490 */
491 static __be32 *xdr_encode_nfstime3(__be32 *p, const struct timespec *timep)
492 {
493 *p++ = cpu_to_be32(timep->tv_sec);
494 *p++ = cpu_to_be32(timep->tv_nsec);
495 return p;
496 }
497
498 static __be32 *xdr_decode_nfstime3(__be32 *p, struct timespec *timep)
499 {
500 timep->tv_sec = be32_to_cpup(p++);
501 timep->tv_nsec = be32_to_cpup(p++);
502 return p;
503 }
504
505 /*
506 * sattr3
507 *
508 * enum time_how {
509 * DONT_CHANGE = 0,
510 * SET_TO_SERVER_TIME = 1,
511 * SET_TO_CLIENT_TIME = 2
512 * };
513 *
514 * union set_mode3 switch (bool set_it) {
515 * case TRUE:
516 * mode3 mode;
517 * default:
518 * void;
519 * };
520 *
521 * union set_uid3 switch (bool set_it) {
522 * case TRUE:
523 * uid3 uid;
524 * default:
525 * void;
526 * };
527 *
528 * union set_gid3 switch (bool set_it) {
529 * case TRUE:
530 * gid3 gid;
531 * default:
532 * void;
533 * };
534 *
535 * union set_size3 switch (bool set_it) {
536 * case TRUE:
537 * size3 size;
538 * default:
539 * void;
540 * };
541 *
542 * union set_atime switch (time_how set_it) {
543 * case SET_TO_CLIENT_TIME:
544 * nfstime3 atime;
545 * default:
546 * void;
547 * };
548 *
549 * union set_mtime switch (time_how set_it) {
550 * case SET_TO_CLIENT_TIME:
551 * nfstime3 mtime;
552 * default:
553 * void;
554 * };
555 *
556 * struct sattr3 {
557 * set_mode3 mode;
558 * set_uid3 uid;
559 * set_gid3 gid;
560 * set_size3 size;
561 * set_atime atime;
562 * set_mtime mtime;
563 * };
564 */
565 static void encode_sattr3(struct xdr_stream *xdr, const struct iattr *attr)
566 {
567 u32 nbytes;
568 __be32 *p;
569
570 /*
571 * In order to make only a single xdr_reserve_space() call,
572 * pre-compute the total number of bytes to be reserved.
573 * Six boolean values, one for each set_foo field, are always
574 * present in the encoded result, so start there.
575 */
576 nbytes = 6 * 4;
577 if (attr->ia_valid & ATTR_MODE)
578 nbytes += 4;
579 if (attr->ia_valid & ATTR_UID)
580 nbytes += 4;
581 if (attr->ia_valid & ATTR_GID)
582 nbytes += 4;
583 if (attr->ia_valid & ATTR_SIZE)
584 nbytes += 8;
585 if (attr->ia_valid & ATTR_ATIME_SET)
586 nbytes += 8;
587 if (attr->ia_valid & ATTR_MTIME_SET)
588 nbytes += 8;
589 p = xdr_reserve_space(xdr, nbytes);
590
591 if (attr->ia_valid & ATTR_MODE) {
592 *p++ = xdr_one;
593 *p++ = cpu_to_be32(attr->ia_mode & S_IALLUGO);
594 } else
595 *p++ = xdr_zero;
596
597 if (attr->ia_valid & ATTR_UID) {
598 *p++ = xdr_one;
599 *p++ = cpu_to_be32(attr->ia_uid);
600 } else
601 *p++ = xdr_zero;
602
603 if (attr->ia_valid & ATTR_GID) {
604 *p++ = xdr_one;
605 *p++ = cpu_to_be32(attr->ia_gid);
606 } else
607 *p++ = xdr_zero;
608
609 if (attr->ia_valid & ATTR_SIZE) {
610 *p++ = xdr_one;
611 p = xdr_encode_hyper(p, (u64)attr->ia_size);
612 } else
613 *p++ = xdr_zero;
614
615 if (attr->ia_valid & ATTR_ATIME_SET) {
616 *p++ = xdr_two;
617 p = xdr_encode_nfstime3(p, &attr->ia_atime);
618 } else if (attr->ia_valid & ATTR_ATIME) {
619 *p++ = xdr_one;
620 } else
621 *p++ = xdr_zero;
622
623 if (attr->ia_valid & ATTR_MTIME_SET) {
624 *p++ = xdr_two;
625 xdr_encode_nfstime3(p, &attr->ia_mtime);
626 } else if (attr->ia_valid & ATTR_MTIME) {
627 *p = xdr_one;
628 } else
629 *p = xdr_zero;
630 }
631
632 /*
633 * fattr3
634 *
635 * struct fattr3 {
636 * ftype3 type;
637 * mode3 mode;
638 * uint32 nlink;
639 * uid3 uid;
640 * gid3 gid;
641 * size3 size;
642 * size3 used;
643 * specdata3 rdev;
644 * uint64 fsid;
645 * fileid3 fileid;
646 * nfstime3 atime;
647 * nfstime3 mtime;
648 * nfstime3 ctime;
649 * };
650 */
651 static int decode_fattr3(struct xdr_stream *xdr, struct nfs_fattr *fattr)
652 {
653 umode_t fmode;
654 __be32 *p;
655
656 p = xdr_inline_decode(xdr, NFS3_fattr_sz << 2);
657 if (unlikely(p == NULL))
658 goto out_overflow;
659
660 p = xdr_decode_ftype3(p, &fmode);
661
662 fattr->mode = (be32_to_cpup(p++) & ~S_IFMT) | fmode;
663 fattr->nlink = be32_to_cpup(p++);
664 fattr->uid = be32_to_cpup(p++);
665 fattr->gid = be32_to_cpup(p++);
666
667 p = xdr_decode_size3(p, &fattr->size);
668 p = xdr_decode_size3(p, &fattr->du.nfs3.used);
669 p = xdr_decode_specdata3(p, &fattr->rdev);
670
671 p = xdr_decode_hyper(p, &fattr->fsid.major);
672 fattr->fsid.minor = 0;
673
674 p = xdr_decode_fileid3(p, &fattr->fileid);
675 p = xdr_decode_nfstime3(p, &fattr->atime);
676 p = xdr_decode_nfstime3(p, &fattr->mtime);
677 xdr_decode_nfstime3(p, &fattr->ctime);
678
679 fattr->valid |= NFS_ATTR_FATTR_V3;
680 return 0;
681 out_overflow:
682 print_overflow_msg(__func__, xdr);
683 return -EIO;
684 }
685
686 /*
687 * post_op_attr
688 *
689 * union post_op_attr switch (bool attributes_follow) {
690 * case TRUE:
691 * fattr3 attributes;
692 * case FALSE:
693 * void;
694 * };
695 */
696 static int decode_post_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
697 {
698 __be32 *p;
699
700 p = xdr_inline_decode(xdr, 4);
701 if (unlikely(p == NULL))
702 goto out_overflow;
703 if (*p != xdr_zero)
704 return decode_fattr3(xdr, fattr);
705 return 0;
706 out_overflow:
707 print_overflow_msg(__func__, xdr);
708 return -EIO;
709 }
710
711 /*
712 * wcc_attr
713 * struct wcc_attr {
714 * size3 size;
715 * nfstime3 mtime;
716 * nfstime3 ctime;
717 * };
718 */
719 static int decode_wcc_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
720 {
721 __be32 *p;
722
723 p = xdr_inline_decode(xdr, NFS3_wcc_attr_sz << 2);
724 if (unlikely(p == NULL))
725 goto out_overflow;
726
727 fattr->valid |= NFS_ATTR_FATTR_PRESIZE
728 | NFS_ATTR_FATTR_PREMTIME
729 | NFS_ATTR_FATTR_PRECTIME;
730
731 p = xdr_decode_size3(p, &fattr->pre_size);
732 p = xdr_decode_nfstime3(p, &fattr->pre_mtime);
733 xdr_decode_nfstime3(p, &fattr->pre_ctime);
734
735 return 0;
736 out_overflow:
737 print_overflow_msg(__func__, xdr);
738 return -EIO;
739 }
740
741 /*
742 * pre_op_attr
743 * union pre_op_attr switch (bool attributes_follow) {
744 * case TRUE:
745 * wcc_attr attributes;
746 * case FALSE:
747 * void;
748 * };
749 *
750 * wcc_data
751 *
752 * struct wcc_data {
753 * pre_op_attr before;
754 * post_op_attr after;
755 * };
756 */
757 static int decode_pre_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
758 {
759 __be32 *p;
760
761 p = xdr_inline_decode(xdr, 4);
762 if (unlikely(p == NULL))
763 goto out_overflow;
764 if (*p != xdr_zero)
765 return decode_wcc_attr(xdr, fattr);
766 return 0;
767 out_overflow:
768 print_overflow_msg(__func__, xdr);
769 return -EIO;
770 }
771
772 static int decode_wcc_data(struct xdr_stream *xdr, struct nfs_fattr *fattr)
773 {
774 int error;
775
776 error = decode_pre_op_attr(xdr, fattr);
777 if (unlikely(error))
778 goto out;
779 error = decode_post_op_attr(xdr, fattr);
780 out:
781 return error;
782 }
783
784 /*
785 * post_op_fh3
786 *
787 * union post_op_fh3 switch (bool handle_follows) {
788 * case TRUE:
789 * nfs_fh3 handle;
790 * case FALSE:
791 * void;
792 * };
793 */
794 static int decode_post_op_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
795 {
796 __be32 *p = xdr_inline_decode(xdr, 4);
797 if (unlikely(p == NULL))
798 goto out_overflow;
799 if (*p != xdr_zero)
800 return decode_nfs_fh3(xdr, fh);
801 zero_nfs_fh3(fh);
802 return 0;
803 out_overflow:
804 print_overflow_msg(__func__, xdr);
805 return -EIO;
806 }
807
808 /*
809 * diropargs3
810 *
811 * struct diropargs3 {
812 * nfs_fh3 dir;
813 * filename3 name;
814 * };
815 */
816 static void encode_diropargs3(struct xdr_stream *xdr, const struct nfs_fh *fh,
817 const char *name, u32 length)
818 {
819 encode_nfs_fh3(xdr, fh);
820 encode_filename3(xdr, name, length);
821 }
822
823
824 /*
825 * NFSv3 XDR encode functions
826 *
827 * NFSv3 argument types are defined in section 3.3 of RFC 1813:
828 * "NFS Version 3 Protocol Specification".
829 */
830
831 /*
832 * 3.3.1 GETATTR3args
833 *
834 * struct GETATTR3args {
835 * nfs_fh3 object;
836 * };
837 */
838 static void nfs3_xdr_enc_getattr3args(struct rpc_rqst *req,
839 struct xdr_stream *xdr,
840 const struct nfs_fh *fh)
841 {
842 encode_nfs_fh3(xdr, fh);
843 }
844
845 /*
846 * 3.3.2 SETATTR3args
847 *
848 * union sattrguard3 switch (bool check) {
849 * case TRUE:
850 * nfstime3 obj_ctime;
851 * case FALSE:
852 * void;
853 * };
854 *
855 * struct SETATTR3args {
856 * nfs_fh3 object;
857 * sattr3 new_attributes;
858 * sattrguard3 guard;
859 * };
860 */
861 static void encode_sattrguard3(struct xdr_stream *xdr,
862 const struct nfs3_sattrargs *args)
863 {
864 __be32 *p;
865
866 if (args->guard) {
867 p = xdr_reserve_space(xdr, 4 + 8);
868 *p++ = xdr_one;
869 xdr_encode_nfstime3(p, &args->guardtime);
870 } else {
871 p = xdr_reserve_space(xdr, 4);
872 *p = xdr_zero;
873 }
874 }
875
876 static void nfs3_xdr_enc_setattr3args(struct rpc_rqst *req,
877 struct xdr_stream *xdr,
878 const struct nfs3_sattrargs *args)
879 {
880 encode_nfs_fh3(xdr, args->fh);
881 encode_sattr3(xdr, args->sattr);
882 encode_sattrguard3(xdr, args);
883 }
884
885 /*
886 * 3.3.3 LOOKUP3args
887 *
888 * struct LOOKUP3args {
889 * diropargs3 what;
890 * };
891 */
892 static void nfs3_xdr_enc_lookup3args(struct rpc_rqst *req,
893 struct xdr_stream *xdr,
894 const struct nfs3_diropargs *args)
895 {
896 encode_diropargs3(xdr, args->fh, args->name, args->len);
897 }
898
899 /*
900 * 3.3.4 ACCESS3args
901 *
902 * struct ACCESS3args {
903 * nfs_fh3 object;
904 * uint32 access;
905 * };
906 */
907 static void encode_access3args(struct xdr_stream *xdr,
908 const struct nfs3_accessargs *args)
909 {
910 encode_nfs_fh3(xdr, args->fh);
911 encode_uint32(xdr, args->access);
912 }
913
914 static void nfs3_xdr_enc_access3args(struct rpc_rqst *req,
915 struct xdr_stream *xdr,
916 const struct nfs3_accessargs *args)
917 {
918 encode_access3args(xdr, args);
919 }
920
921 /*
922 * 3.3.5 READLINK3args
923 *
924 * struct READLINK3args {
925 * nfs_fh3 symlink;
926 * };
927 */
928 static void nfs3_xdr_enc_readlink3args(struct rpc_rqst *req,
929 struct xdr_stream *xdr,
930 const struct nfs3_readlinkargs *args)
931 {
932 encode_nfs_fh3(xdr, args->fh);
933 prepare_reply_buffer(req, args->pages, args->pgbase,
934 args->pglen, NFS3_readlinkres_sz);
935 }
936
937 /*
938 * 3.3.6 READ3args
939 *
940 * struct READ3args {
941 * nfs_fh3 file;
942 * offset3 offset;
943 * count3 count;
944 * };
945 */
946 static void encode_read3args(struct xdr_stream *xdr,
947 const struct nfs_readargs *args)
948 {
949 __be32 *p;
950
951 encode_nfs_fh3(xdr, args->fh);
952
953 p = xdr_reserve_space(xdr, 8 + 4);
954 p = xdr_encode_hyper(p, args->offset);
955 *p = cpu_to_be32(args->count);
956 }
957
958 static void nfs3_xdr_enc_read3args(struct rpc_rqst *req,
959 struct xdr_stream *xdr,
960 const struct nfs_readargs *args)
961 {
962 encode_read3args(xdr, args);
963 prepare_reply_buffer(req, args->pages, args->pgbase,
964 args->count, NFS3_readres_sz);
965 req->rq_rcv_buf.flags |= XDRBUF_READ;
966 }
967
968 /*
969 * 3.3.7 WRITE3args
970 *
971 * enum stable_how {
972 * UNSTABLE = 0,
973 * DATA_SYNC = 1,
974 * FILE_SYNC = 2
975 * };
976 *
977 * struct WRITE3args {
978 * nfs_fh3 file;
979 * offset3 offset;
980 * count3 count;
981 * stable_how stable;
982 * opaque data<>;
983 * };
984 */
985 static void encode_write3args(struct xdr_stream *xdr,
986 const struct nfs_writeargs *args)
987 {
988 __be32 *p;
989
990 encode_nfs_fh3(xdr, args->fh);
991
992 p = xdr_reserve_space(xdr, 8 + 4 + 4 + 4);
993 p = xdr_encode_hyper(p, args->offset);
994 *p++ = cpu_to_be32(args->count);
995 *p++ = cpu_to_be32(args->stable);
996 *p = cpu_to_be32(args->count);
997 xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
998 }
999
1000 static void nfs3_xdr_enc_write3args(struct rpc_rqst *req,
1001 struct xdr_stream *xdr,
1002 const struct nfs_writeargs *args)
1003 {
1004 encode_write3args(xdr, args);
1005 xdr->buf->flags |= XDRBUF_WRITE;
1006 }
1007
1008 /*
1009 * 3.3.8 CREATE3args
1010 *
1011 * enum createmode3 {
1012 * UNCHECKED = 0,
1013 * GUARDED = 1,
1014 * EXCLUSIVE = 2
1015 * };
1016 *
1017 * union createhow3 switch (createmode3 mode) {
1018 * case UNCHECKED:
1019 * case GUARDED:
1020 * sattr3 obj_attributes;
1021 * case EXCLUSIVE:
1022 * createverf3 verf;
1023 * };
1024 *
1025 * struct CREATE3args {
1026 * diropargs3 where;
1027 * createhow3 how;
1028 * };
1029 */
1030 static void encode_createhow3(struct xdr_stream *xdr,
1031 const struct nfs3_createargs *args)
1032 {
1033 encode_uint32(xdr, args->createmode);
1034 switch (args->createmode) {
1035 case NFS3_CREATE_UNCHECKED:
1036 case NFS3_CREATE_GUARDED:
1037 encode_sattr3(xdr, args->sattr);
1038 break;
1039 case NFS3_CREATE_EXCLUSIVE:
1040 encode_createverf3(xdr, args->verifier);
1041 break;
1042 default:
1043 BUG();
1044 }
1045 }
1046
1047 static void nfs3_xdr_enc_create3args(struct rpc_rqst *req,
1048 struct xdr_stream *xdr,
1049 const struct nfs3_createargs *args)
1050 {
1051 encode_diropargs3(xdr, args->fh, args->name, args->len);
1052 encode_createhow3(xdr, args);
1053 }
1054
1055 /*
1056 * 3.3.9 MKDIR3args
1057 *
1058 * struct MKDIR3args {
1059 * diropargs3 where;
1060 * sattr3 attributes;
1061 * };
1062 */
1063 static void nfs3_xdr_enc_mkdir3args(struct rpc_rqst *req,
1064 struct xdr_stream *xdr,
1065 const struct nfs3_mkdirargs *args)
1066 {
1067 encode_diropargs3(xdr, args->fh, args->name, args->len);
1068 encode_sattr3(xdr, args->sattr);
1069 }
1070
1071 /*
1072 * 3.3.10 SYMLINK3args
1073 *
1074 * struct symlinkdata3 {
1075 * sattr3 symlink_attributes;
1076 * nfspath3 symlink_data;
1077 * };
1078 *
1079 * struct SYMLINK3args {
1080 * diropargs3 where;
1081 * symlinkdata3 symlink;
1082 * };
1083 */
1084 static void encode_symlinkdata3(struct xdr_stream *xdr,
1085 const struct nfs3_symlinkargs *args)
1086 {
1087 encode_sattr3(xdr, args->sattr);
1088 encode_nfspath3(xdr, args->pages, args->pathlen);
1089 }
1090
1091 static void nfs3_xdr_enc_symlink3args(struct rpc_rqst *req,
1092 struct xdr_stream *xdr,
1093 const struct nfs3_symlinkargs *args)
1094 {
1095 encode_diropargs3(xdr, args->fromfh, args->fromname, args->fromlen);
1096 encode_symlinkdata3(xdr, args);
1097 }
1098
1099 /*
1100 * 3.3.11 MKNOD3args
1101 *
1102 * struct devicedata3 {
1103 * sattr3 dev_attributes;
1104 * specdata3 spec;
1105 * };
1106 *
1107 * union mknoddata3 switch (ftype3 type) {
1108 * case NF3CHR:
1109 * case NF3BLK:
1110 * devicedata3 device;
1111 * case NF3SOCK:
1112 * case NF3FIFO:
1113 * sattr3 pipe_attributes;
1114 * default:
1115 * void;
1116 * };
1117 *
1118 * struct MKNOD3args {
1119 * diropargs3 where;
1120 * mknoddata3 what;
1121 * };
1122 */
1123 static void encode_devicedata3(struct xdr_stream *xdr,
1124 const struct nfs3_mknodargs *args)
1125 {
1126 encode_sattr3(xdr, args->sattr);
1127 encode_specdata3(xdr, args->rdev);
1128 }
1129
1130 static void encode_mknoddata3(struct xdr_stream *xdr,
1131 const struct nfs3_mknodargs *args)
1132 {
1133 encode_ftype3(xdr, args->type);
1134 switch (args->type) {
1135 case NF3CHR:
1136 case NF3BLK:
1137 encode_devicedata3(xdr, args);
1138 break;
1139 case NF3SOCK:
1140 case NF3FIFO:
1141 encode_sattr3(xdr, args->sattr);
1142 break;
1143 case NF3REG:
1144 case NF3DIR:
1145 break;
1146 default:
1147 BUG();
1148 }
1149 }
1150
1151 static void nfs3_xdr_enc_mknod3args(struct rpc_rqst *req,
1152 struct xdr_stream *xdr,
1153 const struct nfs3_mknodargs *args)
1154 {
1155 encode_diropargs3(xdr, args->fh, args->name, args->len);
1156 encode_mknoddata3(xdr, args);
1157 }
1158
1159 /*
1160 * 3.3.12 REMOVE3args
1161 *
1162 * struct REMOVE3args {
1163 * diropargs3 object;
1164 * };
1165 */
1166 static void nfs3_xdr_enc_remove3args(struct rpc_rqst *req,
1167 struct xdr_stream *xdr,
1168 const struct nfs_removeargs *args)
1169 {
1170 encode_diropargs3(xdr, args->fh, args->name.name, args->name.len);
1171 }
1172
1173 /*
1174 * 3.3.14 RENAME3args
1175 *
1176 * struct RENAME3args {
1177 * diropargs3 from;
1178 * diropargs3 to;
1179 * };
1180 */
1181 static void nfs3_xdr_enc_rename3args(struct rpc_rqst *req,
1182 struct xdr_stream *xdr,
1183 const struct nfs_renameargs *args)
1184 {
1185 const struct qstr *old = args->old_name;
1186 const struct qstr *new = args->new_name;
1187
1188 encode_diropargs3(xdr, args->old_dir, old->name, old->len);
1189 encode_diropargs3(xdr, args->new_dir, new->name, new->len);
1190 }
1191
1192 /*
1193 * 3.3.15 LINK3args
1194 *
1195 * struct LINK3args {
1196 * nfs_fh3 file;
1197 * diropargs3 link;
1198 * };
1199 */
1200 static void nfs3_xdr_enc_link3args(struct rpc_rqst *req,
1201 struct xdr_stream *xdr,
1202 const struct nfs3_linkargs *args)
1203 {
1204 encode_nfs_fh3(xdr, args->fromfh);
1205 encode_diropargs3(xdr, args->tofh, args->toname, args->tolen);
1206 }
1207
1208 /*
1209 * 3.3.16 READDIR3args
1210 *
1211 * struct READDIR3args {
1212 * nfs_fh3 dir;
1213 * cookie3 cookie;
1214 * cookieverf3 cookieverf;
1215 * count3 count;
1216 * };
1217 */
1218 static void encode_readdir3args(struct xdr_stream *xdr,
1219 const struct nfs3_readdirargs *args)
1220 {
1221 __be32 *p;
1222
1223 encode_nfs_fh3(xdr, args->fh);
1224
1225 p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4);
1226 p = xdr_encode_cookie3(p, args->cookie);
1227 p = xdr_encode_cookieverf3(p, args->verf);
1228 *p = cpu_to_be32(args->count);
1229 }
1230
1231 static void nfs3_xdr_enc_readdir3args(struct rpc_rqst *req,
1232 struct xdr_stream *xdr,
1233 const struct nfs3_readdirargs *args)
1234 {
1235 encode_readdir3args(xdr, args);
1236 prepare_reply_buffer(req, args->pages, 0,
1237 args->count, NFS3_readdirres_sz);
1238 }
1239
1240 /*
1241 * 3.3.17 READDIRPLUS3args
1242 *
1243 * struct READDIRPLUS3args {
1244 * nfs_fh3 dir;
1245 * cookie3 cookie;
1246 * cookieverf3 cookieverf;
1247 * count3 dircount;
1248 * count3 maxcount;
1249 * };
1250 */
1251 static void encode_readdirplus3args(struct xdr_stream *xdr,
1252 const struct nfs3_readdirargs *args)
1253 {
1254 __be32 *p;
1255
1256 encode_nfs_fh3(xdr, args->fh);
1257
1258 p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4 + 4);
1259 p = xdr_encode_cookie3(p, args->cookie);
1260 p = xdr_encode_cookieverf3(p, args->verf);
1261
1262 /*
1263 * readdirplus: need dircount + buffer size.
1264 * We just make sure we make dircount big enough
1265 */
1266 *p++ = cpu_to_be32(args->count >> 3);
1267
1268 *p = cpu_to_be32(args->count);
1269 }
1270
1271 static void nfs3_xdr_enc_readdirplus3args(struct rpc_rqst *req,
1272 struct xdr_stream *xdr,
1273 const struct nfs3_readdirargs *args)
1274 {
1275 encode_readdirplus3args(xdr, args);
1276 prepare_reply_buffer(req, args->pages, 0,
1277 args->count, NFS3_readdirres_sz);
1278 }
1279
1280 /*
1281 * 3.3.21 COMMIT3args
1282 *
1283 * struct COMMIT3args {
1284 * nfs_fh3 file;
1285 * offset3 offset;
1286 * count3 count;
1287 * };
1288 */
1289 static void encode_commit3args(struct xdr_stream *xdr,
1290 const struct nfs_writeargs *args)
1291 {
1292 __be32 *p;
1293
1294 encode_nfs_fh3(xdr, args->fh);
1295
1296 p = xdr_reserve_space(xdr, 8 + 4);
1297 p = xdr_encode_hyper(p, args->offset);
1298 *p = cpu_to_be32(args->count);
1299 }
1300
1301 static void nfs3_xdr_enc_commit3args(struct rpc_rqst *req,
1302 struct xdr_stream *xdr,
1303 const struct nfs_writeargs *args)
1304 {
1305 encode_commit3args(xdr, args);
1306 }
1307
1308 #ifdef CONFIG_NFS_V3_ACL
1309
1310 static void nfs3_xdr_enc_getacl3args(struct rpc_rqst *req,
1311 struct xdr_stream *xdr,
1312 const struct nfs3_getaclargs *args)
1313 {
1314 encode_nfs_fh3(xdr, args->fh);
1315 encode_uint32(xdr, args->mask);
1316 if (args->mask & (NFS_ACL | NFS_DFACL))
1317 prepare_reply_buffer(req, args->pages, 0,
1318 NFSACL_MAXPAGES << PAGE_SHIFT,
1319 ACL3_getaclres_sz);
1320 }
1321
1322 static void nfs3_xdr_enc_setacl3args(struct rpc_rqst *req,
1323 struct xdr_stream *xdr,
1324 const struct nfs3_setaclargs *args)
1325 {
1326 unsigned int base;
1327 int error;
1328
1329 encode_nfs_fh3(xdr, NFS_FH(args->inode));
1330 encode_uint32(xdr, args->mask);
1331 if (args->npages != 0)
1332 xdr_write_pages(xdr, args->pages, 0, args->len);
1333
1334 base = req->rq_slen;
1335 error = nfsacl_encode(xdr->buf, base, args->inode,
1336 (args->mask & NFS_ACL) ?
1337 args->acl_access : NULL, 1, 0);
1338 BUG_ON(error < 0);
1339 error = nfsacl_encode(xdr->buf, base + error, args->inode,
1340 (args->mask & NFS_DFACL) ?
1341 args->acl_default : NULL, 1,
1342 NFS_ACL_DEFAULT);
1343 BUG_ON(error < 0);
1344 }
1345
1346 #endif /* CONFIG_NFS_V3_ACL */
1347
1348 /*
1349 * NFSv3 XDR decode functions
1350 *
1351 * NFSv3 result types are defined in section 3.3 of RFC 1813:
1352 * "NFS Version 3 Protocol Specification".
1353 */
1354
1355 /*
1356 * 3.3.1 GETATTR3res
1357 *
1358 * struct GETATTR3resok {
1359 * fattr3 obj_attributes;
1360 * };
1361 *
1362 * union GETATTR3res switch (nfsstat3 status) {
1363 * case NFS3_OK:
1364 * GETATTR3resok resok;
1365 * default:
1366 * void;
1367 * };
1368 */
1369 static int nfs3_xdr_dec_getattr3res(struct rpc_rqst *req,
1370 struct xdr_stream *xdr,
1371 struct nfs_fattr *result)
1372 {
1373 enum nfs_stat status;
1374 int error;
1375
1376 error = decode_nfsstat3(xdr, &status);
1377 if (unlikely(error))
1378 goto out;
1379 if (status != NFS3_OK)
1380 goto out_default;
1381 error = decode_fattr3(xdr, result);
1382 out:
1383 return error;
1384 out_default:
1385 return nfs_stat_to_errno(status);
1386 }
1387
1388 /*
1389 * 3.3.2 SETATTR3res
1390 *
1391 * struct SETATTR3resok {
1392 * wcc_data obj_wcc;
1393 * };
1394 *
1395 * struct SETATTR3resfail {
1396 * wcc_data obj_wcc;
1397 * };
1398 *
1399 * union SETATTR3res switch (nfsstat3 status) {
1400 * case NFS3_OK:
1401 * SETATTR3resok resok;
1402 * default:
1403 * SETATTR3resfail resfail;
1404 * };
1405 */
1406 static int nfs3_xdr_dec_setattr3res(struct rpc_rqst *req,
1407 struct xdr_stream *xdr,
1408 struct nfs_fattr *result)
1409 {
1410 enum nfs_stat status;
1411 int error;
1412
1413 error = decode_nfsstat3(xdr, &status);
1414 if (unlikely(error))
1415 goto out;
1416 error = decode_wcc_data(xdr, result);
1417 if (unlikely(error))
1418 goto out;
1419 if (status != NFS3_OK)
1420 goto out_status;
1421 out:
1422 return error;
1423 out_status:
1424 return nfs_stat_to_errno(status);
1425 }
1426
1427 /*
1428 * 3.3.3 LOOKUP3res
1429 *
1430 * struct LOOKUP3resok {
1431 * nfs_fh3 object;
1432 * post_op_attr obj_attributes;
1433 * post_op_attr dir_attributes;
1434 * };
1435 *
1436 * struct LOOKUP3resfail {
1437 * post_op_attr dir_attributes;
1438 * };
1439 *
1440 * union LOOKUP3res switch (nfsstat3 status) {
1441 * case NFS3_OK:
1442 * LOOKUP3resok resok;
1443 * default:
1444 * LOOKUP3resfail resfail;
1445 * };
1446 */
1447 static int nfs3_xdr_dec_lookup3res(struct rpc_rqst *req,
1448 struct xdr_stream *xdr,
1449 struct nfs3_diropres *result)
1450 {
1451 enum nfs_stat status;
1452 int error;
1453
1454 error = decode_nfsstat3(xdr, &status);
1455 if (unlikely(error))
1456 goto out;
1457 if (status != NFS3_OK)
1458 goto out_default;
1459 error = decode_nfs_fh3(xdr, result->fh);
1460 if (unlikely(error))
1461 goto out;
1462 error = decode_post_op_attr(xdr, result->fattr);
1463 if (unlikely(error))
1464 goto out;
1465 error = decode_post_op_attr(xdr, result->dir_attr);
1466 out:
1467 return error;
1468 out_default:
1469 error = decode_post_op_attr(xdr, result->dir_attr);
1470 if (unlikely(error))
1471 goto out;
1472 return nfs_stat_to_errno(status);
1473 }
1474
1475 /*
1476 * 3.3.4 ACCESS3res
1477 *
1478 * struct ACCESS3resok {
1479 * post_op_attr obj_attributes;
1480 * uint32 access;
1481 * };
1482 *
1483 * struct ACCESS3resfail {
1484 * post_op_attr obj_attributes;
1485 * };
1486 *
1487 * union ACCESS3res switch (nfsstat3 status) {
1488 * case NFS3_OK:
1489 * ACCESS3resok resok;
1490 * default:
1491 * ACCESS3resfail resfail;
1492 * };
1493 */
1494 static int nfs3_xdr_dec_access3res(struct rpc_rqst *req,
1495 struct xdr_stream *xdr,
1496 struct nfs3_accessres *result)
1497 {
1498 enum nfs_stat status;
1499 int error;
1500
1501 error = decode_nfsstat3(xdr, &status);
1502 if (unlikely(error))
1503 goto out;
1504 error = decode_post_op_attr(xdr, result->fattr);
1505 if (unlikely(error))
1506 goto out;
1507 if (status != NFS3_OK)
1508 goto out_default;
1509 error = decode_uint32(xdr, &result->access);
1510 out:
1511 return error;
1512 out_default:
1513 return nfs_stat_to_errno(status);
1514 }
1515
1516 /*
1517 * 3.3.5 READLINK3res
1518 *
1519 * struct READLINK3resok {
1520 * post_op_attr symlink_attributes;
1521 * nfspath3 data;
1522 * };
1523 *
1524 * struct READLINK3resfail {
1525 * post_op_attr symlink_attributes;
1526 * };
1527 *
1528 * union READLINK3res switch (nfsstat3 status) {
1529 * case NFS3_OK:
1530 * READLINK3resok resok;
1531 * default:
1532 * READLINK3resfail resfail;
1533 * };
1534 */
1535 static int nfs3_xdr_dec_readlink3res(struct rpc_rqst *req,
1536 struct xdr_stream *xdr,
1537 struct nfs_fattr *result)
1538 {
1539 enum nfs_stat status;
1540 int error;
1541
1542 error = decode_nfsstat3(xdr, &status);
1543 if (unlikely(error))
1544 goto out;
1545 error = decode_post_op_attr(xdr, result);
1546 if (unlikely(error))
1547 goto out;
1548 if (status != NFS3_OK)
1549 goto out_default;
1550 error = decode_nfspath3(xdr);
1551 out:
1552 return error;
1553 out_default:
1554 return nfs_stat_to_errno(status);
1555 }
1556
1557 /*
1558 * 3.3.6 READ3res
1559 *
1560 * struct READ3resok {
1561 * post_op_attr file_attributes;
1562 * count3 count;
1563 * bool eof;
1564 * opaque data<>;
1565 * };
1566 *
1567 * struct READ3resfail {
1568 * post_op_attr file_attributes;
1569 * };
1570 *
1571 * union READ3res switch (nfsstat3 status) {
1572 * case NFS3_OK:
1573 * READ3resok resok;
1574 * default:
1575 * READ3resfail resfail;
1576 * };
1577 */
1578 static int decode_read3resok(struct xdr_stream *xdr,
1579 struct nfs_readres *result)
1580 {
1581 u32 eof, count, ocount, recvd;
1582 size_t hdrlen;
1583 __be32 *p;
1584
1585 p = xdr_inline_decode(xdr, 4 + 4 + 4);
1586 if (unlikely(p == NULL))
1587 goto out_overflow;
1588 count = be32_to_cpup(p++);
1589 eof = be32_to_cpup(p++);
1590 ocount = be32_to_cpup(p++);
1591 if (unlikely(ocount != count))
1592 goto out_mismatch;
1593 hdrlen = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base;
1594 recvd = xdr->buf->len - hdrlen;
1595 if (unlikely(count > recvd))
1596 goto out_cheating;
1597
1598 out:
1599 xdr_read_pages(xdr, count);
1600 result->eof = eof;
1601 result->count = count;
1602 return count;
1603 out_mismatch:
1604 dprintk("NFS: READ count doesn't match length of opaque: "
1605 "count %u != ocount %u\n", count, ocount);
1606 return -EIO;
1607 out_cheating:
1608 dprintk("NFS: server cheating in read result: "
1609 "count %u > recvd %u\n", count, recvd);
1610 count = recvd;
1611 eof = 0;
1612 goto out;
1613 out_overflow:
1614 print_overflow_msg(__func__, xdr);
1615 return -EIO;
1616 }
1617
1618 static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1619 struct nfs_readres *result)
1620 {
1621 enum nfs_stat status;
1622 int error;
1623
1624 error = decode_nfsstat3(xdr, &status);
1625 if (unlikely(error))
1626 goto out;
1627 error = decode_post_op_attr(xdr, result->fattr);
1628 if (unlikely(error))
1629 goto out;
1630 if (status != NFS3_OK)
1631 goto out_status;
1632 error = decode_read3resok(xdr, result);
1633 out:
1634 return error;
1635 out_status:
1636 return nfs_stat_to_errno(status);
1637 }
1638
1639 /*
1640 * 3.3.7 WRITE3res
1641 *
1642 * enum stable_how {
1643 * UNSTABLE = 0,
1644 * DATA_SYNC = 1,
1645 * FILE_SYNC = 2
1646 * };
1647 *
1648 * struct WRITE3resok {
1649 * wcc_data file_wcc;
1650 * count3 count;
1651 * stable_how committed;
1652 * writeverf3 verf;
1653 * };
1654 *
1655 * struct WRITE3resfail {
1656 * wcc_data file_wcc;
1657 * };
1658 *
1659 * union WRITE3res switch (nfsstat3 status) {
1660 * case NFS3_OK:
1661 * WRITE3resok resok;
1662 * default:
1663 * WRITE3resfail resfail;
1664 * };
1665 */
1666 static int decode_write3resok(struct xdr_stream *xdr,
1667 struct nfs_writeres *result)
1668 {
1669 __be32 *p;
1670
1671 p = xdr_inline_decode(xdr, 4 + 4 + NFS3_WRITEVERFSIZE);
1672 if (unlikely(p == NULL))
1673 goto out_overflow;
1674 result->count = be32_to_cpup(p++);
1675 result->verf->committed = be32_to_cpup(p++);
1676 if (unlikely(result->verf->committed > NFS_FILE_SYNC))
1677 goto out_badvalue;
1678 memcpy(result->verf->verifier, p, NFS3_WRITEVERFSIZE);
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 return -EIO;
1686 }
1687
1688 static int nfs3_xdr_dec_write3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1689 struct nfs_writeres *result)
1690 {
1691 enum nfs_stat status;
1692 int error;
1693
1694 error = decode_nfsstat3(xdr, &status);
1695 if (unlikely(error))
1696 goto out;
1697 error = decode_wcc_data(xdr, result->fattr);
1698 if (unlikely(error))
1699 goto out;
1700 if (status != NFS3_OK)
1701 goto out_status;
1702 error = decode_write3resok(xdr, result);
1703 out:
1704 return error;
1705 out_status:
1706 return nfs_stat_to_errno(status);
1707 }
1708
1709 /*
1710 * 3.3.8 CREATE3res
1711 *
1712 * struct CREATE3resok {
1713 * post_op_fh3 obj;
1714 * post_op_attr obj_attributes;
1715 * wcc_data dir_wcc;
1716 * };
1717 *
1718 * struct CREATE3resfail {
1719 * wcc_data dir_wcc;
1720 * };
1721 *
1722 * union CREATE3res switch (nfsstat3 status) {
1723 * case NFS3_OK:
1724 * CREATE3resok resok;
1725 * default:
1726 * CREATE3resfail resfail;
1727 * };
1728 */
1729 static int decode_create3resok(struct xdr_stream *xdr,
1730 struct nfs3_diropres *result)
1731 {
1732 int error;
1733
1734 error = decode_post_op_fh3(xdr, result->fh);
1735 if (unlikely(error))
1736 goto out;
1737 error = decode_post_op_attr(xdr, result->fattr);
1738 if (unlikely(error))
1739 goto out;
1740 /* The server isn't required to return a file handle.
1741 * If it didn't, force the client to perform a LOOKUP
1742 * to determine the correct file handle and attribute
1743 * values for the new object. */
1744 if (result->fh->size == 0)
1745 result->fattr->valid = 0;
1746 error = decode_wcc_data(xdr, result->dir_attr);
1747 out:
1748 return error;
1749 }
1750
1751 static int nfs3_xdr_dec_create3res(struct rpc_rqst *req,
1752 struct xdr_stream *xdr,
1753 struct nfs3_diropres *result)
1754 {
1755 enum nfs_stat status;
1756 int error;
1757
1758 error = decode_nfsstat3(xdr, &status);
1759 if (unlikely(error))
1760 goto out;
1761 if (status != NFS3_OK)
1762 goto out_default;
1763 error = decode_create3resok(xdr, result);
1764 out:
1765 return error;
1766 out_default:
1767 error = decode_wcc_data(xdr, result->dir_attr);
1768 if (unlikely(error))
1769 goto out;
1770 return nfs_stat_to_errno(status);
1771 }
1772
1773 /*
1774 * 3.3.12 REMOVE3res
1775 *
1776 * struct REMOVE3resok {
1777 * wcc_data dir_wcc;
1778 * };
1779 *
1780 * struct REMOVE3resfail {
1781 * wcc_data dir_wcc;
1782 * };
1783 *
1784 * union REMOVE3res switch (nfsstat3 status) {
1785 * case NFS3_OK:
1786 * REMOVE3resok resok;
1787 * default:
1788 * REMOVE3resfail resfail;
1789 * };
1790 */
1791 static int nfs3_xdr_dec_remove3res(struct rpc_rqst *req,
1792 struct xdr_stream *xdr,
1793 struct nfs_removeres *result)
1794 {
1795 enum nfs_stat status;
1796 int error;
1797
1798 error = decode_nfsstat3(xdr, &status);
1799 if (unlikely(error))
1800 goto out;
1801 error = decode_wcc_data(xdr, result->dir_attr);
1802 if (unlikely(error))
1803 goto out;
1804 if (status != NFS3_OK)
1805 goto out_status;
1806 out:
1807 return error;
1808 out_status:
1809 return nfs_stat_to_errno(status);
1810 }
1811
1812 /*
1813 * 3.3.14 RENAME3res
1814 *
1815 * struct RENAME3resok {
1816 * wcc_data fromdir_wcc;
1817 * wcc_data todir_wcc;
1818 * };
1819 *
1820 * struct RENAME3resfail {
1821 * wcc_data fromdir_wcc;
1822 * wcc_data todir_wcc;
1823 * };
1824 *
1825 * union RENAME3res switch (nfsstat3 status) {
1826 * case NFS3_OK:
1827 * RENAME3resok resok;
1828 * default:
1829 * RENAME3resfail resfail;
1830 * };
1831 */
1832 static int nfs3_xdr_dec_rename3res(struct rpc_rqst *req,
1833 struct xdr_stream *xdr,
1834 struct nfs_renameres *result)
1835 {
1836 enum nfs_stat status;
1837 int error;
1838
1839 error = decode_nfsstat3(xdr, &status);
1840 if (unlikely(error))
1841 goto out;
1842 error = decode_wcc_data(xdr, result->old_fattr);
1843 if (unlikely(error))
1844 goto out;
1845 error = decode_wcc_data(xdr, result->new_fattr);
1846 if (unlikely(error))
1847 goto out;
1848 if (status != NFS3_OK)
1849 goto out_status;
1850 out:
1851 return error;
1852 out_status:
1853 return nfs_stat_to_errno(status);
1854 }
1855
1856 /*
1857 * 3.3.15 LINK3res
1858 *
1859 * struct LINK3resok {
1860 * post_op_attr file_attributes;
1861 * wcc_data linkdir_wcc;
1862 * };
1863 *
1864 * struct LINK3resfail {
1865 * post_op_attr file_attributes;
1866 * wcc_data linkdir_wcc;
1867 * };
1868 *
1869 * union LINK3res switch (nfsstat3 status) {
1870 * case NFS3_OK:
1871 * LINK3resok resok;
1872 * default:
1873 * LINK3resfail resfail;
1874 * };
1875 */
1876 static int nfs3_xdr_dec_link3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1877 struct nfs3_linkres *result)
1878 {
1879 enum nfs_stat status;
1880 int error;
1881
1882 error = decode_nfsstat3(xdr, &status);
1883 if (unlikely(error))
1884 goto out;
1885 error = decode_post_op_attr(xdr, result->fattr);
1886 if (unlikely(error))
1887 goto out;
1888 error = decode_wcc_data(xdr, result->dir_attr);
1889 if (unlikely(error))
1890 goto out;
1891 if (status != NFS3_OK)
1892 goto out_status;
1893 out:
1894 return error;
1895 out_status:
1896 return nfs_stat_to_errno(status);
1897 }
1898
1899 /**
1900 * nfs3_decode_dirent - Decode a single NFSv3 directory entry stored in
1901 * the local page cache
1902 * @xdr: XDR stream where entry resides
1903 * @entry: buffer to fill in with entry data
1904 * @plus: boolean indicating whether this should be a readdirplus entry
1905 *
1906 * Returns zero if successful, otherwise a negative errno value is
1907 * returned.
1908 *
1909 * This function is not invoked during READDIR reply decoding, but
1910 * rather whenever an application invokes the getdents(2) system call
1911 * on a directory already in our cache.
1912 *
1913 * 3.3.16 entry3
1914 *
1915 * struct entry3 {
1916 * fileid3 fileid;
1917 * filename3 name;
1918 * cookie3 cookie;
1919 * fhandle3 filehandle;
1920 * post_op_attr3 attributes;
1921 * entry3 *nextentry;
1922 * };
1923 *
1924 * 3.3.17 entryplus3
1925 * struct entryplus3 {
1926 * fileid3 fileid;
1927 * filename3 name;
1928 * cookie3 cookie;
1929 * post_op_attr name_attributes;
1930 * post_op_fh3 name_handle;
1931 * entryplus3 *nextentry;
1932 * };
1933 */
1934 int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
1935 int plus)
1936 {
1937 struct nfs_entry old = *entry;
1938 __be32 *p;
1939 int error;
1940
1941 p = xdr_inline_decode(xdr, 4);
1942 if (unlikely(p == NULL))
1943 goto out_overflow;
1944 if (*p == xdr_zero) {
1945 p = xdr_inline_decode(xdr, 4);
1946 if (unlikely(p == NULL))
1947 goto out_overflow;
1948 if (*p == xdr_zero)
1949 return -EAGAIN;
1950 entry->eof = 1;
1951 return -EBADCOOKIE;
1952 }
1953
1954 error = decode_fileid3(xdr, &entry->ino);
1955 if (unlikely(error))
1956 return error;
1957
1958 error = decode_inline_filename3(xdr, &entry->name, &entry->len);
1959 if (unlikely(error))
1960 return error;
1961
1962 entry->prev_cookie = entry->cookie;
1963 error = decode_cookie3(xdr, &entry->cookie);
1964 if (unlikely(error))
1965 return error;
1966
1967 entry->d_type = DT_UNKNOWN;
1968
1969 if (plus) {
1970 entry->fattr->valid = 0;
1971 error = decode_post_op_attr(xdr, entry->fattr);
1972 if (unlikely(error))
1973 return error;
1974 if (entry->fattr->valid & NFS_ATTR_FATTR_V3)
1975 entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);
1976
1977 /* In fact, a post_op_fh3: */
1978 p = xdr_inline_decode(xdr, 4);
1979 if (unlikely(p == NULL))
1980 goto out_overflow;
1981 if (*p != xdr_zero) {
1982 error = decode_nfs_fh3(xdr, entry->fh);
1983 if (unlikely(error)) {
1984 if (error == -E2BIG)
1985 goto out_truncated;
1986 return error;
1987 }
1988 } else
1989 zero_nfs_fh3(entry->fh);
1990 }
1991
1992 return 0;
1993
1994 out_overflow:
1995 print_overflow_msg(__func__, xdr);
1996 return -EAGAIN;
1997 out_truncated:
1998 dprintk("NFS: directory entry contains invalid file handle\n");
1999 *entry = old;
2000 return -EAGAIN;
2001 }
2002
2003 /*
2004 * 3.3.16 READDIR3res
2005 *
2006 * struct dirlist3 {
2007 * entry3 *entries;
2008 * bool eof;
2009 * };
2010 *
2011 * struct READDIR3resok {
2012 * post_op_attr dir_attributes;
2013 * cookieverf3 cookieverf;
2014 * dirlist3 reply;
2015 * };
2016 *
2017 * struct READDIR3resfail {
2018 * post_op_attr dir_attributes;
2019 * };
2020 *
2021 * union READDIR3res switch (nfsstat3 status) {
2022 * case NFS3_OK:
2023 * READDIR3resok resok;
2024 * default:
2025 * READDIR3resfail resfail;
2026 * };
2027 *
2028 * Read the directory contents into the page cache, but otherwise
2029 * don't touch them. The actual decoding is done by nfs3_decode_entry()
2030 * during subsequent nfs_readdir() calls.
2031 */
2032 static int decode_dirlist3(struct xdr_stream *xdr)
2033 {
2034 u32 recvd, pglen;
2035 size_t hdrlen;
2036
2037 pglen = xdr->buf->page_len;
2038 hdrlen = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base;
2039 recvd = xdr->buf->len - hdrlen;
2040 if (unlikely(pglen > recvd))
2041 goto out_cheating;
2042 out:
2043 xdr_read_pages(xdr, pglen);
2044 return pglen;
2045 out_cheating:
2046 dprintk("NFS: server cheating in readdir result: "
2047 "pglen %u > recvd %u\n", pglen, recvd);
2048 pglen = recvd;
2049 goto out;
2050 }
2051
2052 static int decode_readdir3resok(struct xdr_stream *xdr,
2053 struct nfs3_readdirres *result)
2054 {
2055 int error;
2056
2057 error = decode_post_op_attr(xdr, result->dir_attr);
2058 if (unlikely(error))
2059 goto out;
2060 /* XXX: do we need to check if result->verf != NULL ? */
2061 error = decode_cookieverf3(xdr, result->verf);
2062 if (unlikely(error))
2063 goto out;
2064 error = decode_dirlist3(xdr);
2065 out:
2066 return error;
2067 }
2068
2069 static int nfs3_xdr_dec_readdir3res(struct rpc_rqst *req,
2070 struct xdr_stream *xdr,
2071 struct nfs3_readdirres *result)
2072 {
2073 enum nfs_stat status;
2074 int error;
2075
2076 error = decode_nfsstat3(xdr, &status);
2077 if (unlikely(error))
2078 goto out;
2079 if (status != NFS3_OK)
2080 goto out_default;
2081 error = decode_readdir3resok(xdr, result);
2082 out:
2083 return error;
2084 out_default:
2085 error = decode_post_op_attr(xdr, result->dir_attr);
2086 if (unlikely(error))
2087 goto out;
2088 return nfs_stat_to_errno(status);
2089 }
2090
2091 /*
2092 * 3.3.18 FSSTAT3res
2093 *
2094 * struct FSSTAT3resok {
2095 * post_op_attr obj_attributes;
2096 * size3 tbytes;
2097 * size3 fbytes;
2098 * size3 abytes;
2099 * size3 tfiles;
2100 * size3 ffiles;
2101 * size3 afiles;
2102 * uint32 invarsec;
2103 * };
2104 *
2105 * struct FSSTAT3resfail {
2106 * post_op_attr obj_attributes;
2107 * };
2108 *
2109 * union FSSTAT3res switch (nfsstat3 status) {
2110 * case NFS3_OK:
2111 * FSSTAT3resok resok;
2112 * default:
2113 * FSSTAT3resfail resfail;
2114 * };
2115 */
2116 static int decode_fsstat3resok(struct xdr_stream *xdr,
2117 struct nfs_fsstat *result)
2118 {
2119 __be32 *p;
2120
2121 p = xdr_inline_decode(xdr, 8 * 6 + 4);
2122 if (unlikely(p == NULL))
2123 goto out_overflow;
2124 p = xdr_decode_size3(p, &result->tbytes);
2125 p = xdr_decode_size3(p, &result->fbytes);
2126 p = xdr_decode_size3(p, &result->abytes);
2127 p = xdr_decode_size3(p, &result->tfiles);
2128 p = xdr_decode_size3(p, &result->ffiles);
2129 xdr_decode_size3(p, &result->afiles);
2130 /* ignore invarsec */
2131 return 0;
2132 out_overflow:
2133 print_overflow_msg(__func__, xdr);
2134 return -EIO;
2135 }
2136
2137 static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req,
2138 struct xdr_stream *xdr,
2139 struct nfs_fsstat *result)
2140 {
2141 enum nfs_stat status;
2142 int error;
2143
2144 error = decode_nfsstat3(xdr, &status);
2145 if (unlikely(error))
2146 goto out;
2147 error = decode_post_op_attr(xdr, result->fattr);
2148 if (unlikely(error))
2149 goto out;
2150 if (status != NFS3_OK)
2151 goto out_status;
2152 error = decode_fsstat3resok(xdr, result);
2153 out:
2154 return error;
2155 out_status:
2156 return nfs_stat_to_errno(status);
2157 }
2158
2159 /*
2160 * 3.3.19 FSINFO3res
2161 *
2162 * struct FSINFO3resok {
2163 * post_op_attr obj_attributes;
2164 * uint32 rtmax;
2165 * uint32 rtpref;
2166 * uint32 rtmult;
2167 * uint32 wtmax;
2168 * uint32 wtpref;
2169 * uint32 wtmult;
2170 * uint32 dtpref;
2171 * size3 maxfilesize;
2172 * nfstime3 time_delta;
2173 * uint32 properties;
2174 * };
2175 *
2176 * struct FSINFO3resfail {
2177 * post_op_attr obj_attributes;
2178 * };
2179 *
2180 * union FSINFO3res switch (nfsstat3 status) {
2181 * case NFS3_OK:
2182 * FSINFO3resok resok;
2183 * default:
2184 * FSINFO3resfail resfail;
2185 * };
2186 */
2187 static int decode_fsinfo3resok(struct xdr_stream *xdr,
2188 struct nfs_fsinfo *result)
2189 {
2190 __be32 *p;
2191
2192 p = xdr_inline_decode(xdr, 4 * 7 + 8 + 8 + 4);
2193 if (unlikely(p == NULL))
2194 goto out_overflow;
2195 result->rtmax = be32_to_cpup(p++);
2196 result->rtpref = be32_to_cpup(p++);
2197 result->rtmult = be32_to_cpup(p++);
2198 result->wtmax = be32_to_cpup(p++);
2199 result->wtpref = be32_to_cpup(p++);
2200 result->wtmult = be32_to_cpup(p++);
2201 result->dtpref = be32_to_cpup(p++);
2202 p = xdr_decode_size3(p, &result->maxfilesize);
2203 xdr_decode_nfstime3(p, &result->time_delta);
2204
2205 /* ignore properties */
2206 result->lease_time = 0;
2207 return 0;
2208 out_overflow:
2209 print_overflow_msg(__func__, xdr);
2210 return -EIO;
2211 }
2212
2213 static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req,
2214 struct xdr_stream *xdr,
2215 struct nfs_fsinfo *result)
2216 {
2217 enum nfs_stat status;
2218 int error;
2219
2220 error = decode_nfsstat3(xdr, &status);
2221 if (unlikely(error))
2222 goto out;
2223 error = decode_post_op_attr(xdr, result->fattr);
2224 if (unlikely(error))
2225 goto out;
2226 if (status != NFS3_OK)
2227 goto out_status;
2228 error = decode_fsinfo3resok(xdr, result);
2229 out:
2230 return error;
2231 out_status:
2232 return nfs_stat_to_errno(status);
2233 }
2234
2235 /*
2236 * 3.3.20 PATHCONF3res
2237 *
2238 * struct PATHCONF3resok {
2239 * post_op_attr obj_attributes;
2240 * uint32 linkmax;
2241 * uint32 name_max;
2242 * bool no_trunc;
2243 * bool chown_restricted;
2244 * bool case_insensitive;
2245 * bool case_preserving;
2246 * };
2247 *
2248 * struct PATHCONF3resfail {
2249 * post_op_attr obj_attributes;
2250 * };
2251 *
2252 * union PATHCONF3res switch (nfsstat3 status) {
2253 * case NFS3_OK:
2254 * PATHCONF3resok resok;
2255 * default:
2256 * PATHCONF3resfail resfail;
2257 * };
2258 */
2259 static int decode_pathconf3resok(struct xdr_stream *xdr,
2260 struct nfs_pathconf *result)
2261 {
2262 __be32 *p;
2263
2264 p = xdr_inline_decode(xdr, 4 * 6);
2265 if (unlikely(p == NULL))
2266 goto out_overflow;
2267 result->max_link = be32_to_cpup(p++);
2268 result->max_namelen = be32_to_cpup(p);
2269 /* ignore remaining fields */
2270 return 0;
2271 out_overflow:
2272 print_overflow_msg(__func__, xdr);
2273 return -EIO;
2274 }
2275
2276 static int nfs3_xdr_dec_pathconf3res(struct rpc_rqst *req,
2277 struct xdr_stream *xdr,
2278 struct nfs_pathconf *result)
2279 {
2280 enum nfs_stat status;
2281 int error;
2282
2283 error = decode_nfsstat3(xdr, &status);
2284 if (unlikely(error))
2285 goto out;
2286 error = decode_post_op_attr(xdr, result->fattr);
2287 if (unlikely(error))
2288 goto out;
2289 if (status != NFS3_OK)
2290 goto out_status;
2291 error = decode_pathconf3resok(xdr, result);
2292 out:
2293 return error;
2294 out_status:
2295 return nfs_stat_to_errno(status);
2296 }
2297
2298 /*
2299 * 3.3.21 COMMIT3res
2300 *
2301 * struct COMMIT3resok {
2302 * wcc_data file_wcc;
2303 * writeverf3 verf;
2304 * };
2305 *
2306 * struct COMMIT3resfail {
2307 * wcc_data file_wcc;
2308 * };
2309 *
2310 * union COMMIT3res switch (nfsstat3 status) {
2311 * case NFS3_OK:
2312 * COMMIT3resok resok;
2313 * default:
2314 * COMMIT3resfail resfail;
2315 * };
2316 */
2317 static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req,
2318 struct xdr_stream *xdr,
2319 struct nfs_writeres *result)
2320 {
2321 enum nfs_stat status;
2322 int error;
2323
2324 error = decode_nfsstat3(xdr, &status);
2325 if (unlikely(error))
2326 goto out;
2327 error = decode_wcc_data(xdr, result->fattr);
2328 if (unlikely(error))
2329 goto out;
2330 if (status != NFS3_OK)
2331 goto out_status;
2332 error = decode_writeverf3(xdr, result->verf->verifier);
2333 out:
2334 return error;
2335 out_status:
2336 return nfs_stat_to_errno(status);
2337 }
2338
2339 #ifdef CONFIG_NFS_V3_ACL
2340
2341 static inline int decode_getacl3resok(struct xdr_stream *xdr,
2342 struct nfs3_getaclres *result)
2343 {
2344 struct posix_acl **acl;
2345 unsigned int *aclcnt;
2346 size_t hdrlen;
2347 int error;
2348
2349 error = decode_post_op_attr(xdr, result->fattr);
2350 if (unlikely(error))
2351 goto out;
2352 error = decode_uint32(xdr, &result->mask);
2353 if (unlikely(error))
2354 goto out;
2355 error = -EINVAL;
2356 if (result->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
2357 goto out;
2358
2359 hdrlen = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base;
2360
2361 acl = NULL;
2362 if (result->mask & NFS_ACL)
2363 acl = &result->acl_access;
2364 aclcnt = NULL;
2365 if (result->mask & NFS_ACLCNT)
2366 aclcnt = &result->acl_access_count;
2367 error = nfsacl_decode(xdr->buf, hdrlen, aclcnt, acl);
2368 if (unlikely(error <= 0))
2369 goto out;
2370
2371 acl = NULL;
2372 if (result->mask & NFS_DFACL)
2373 acl = &result->acl_default;
2374 aclcnt = NULL;
2375 if (result->mask & NFS_DFACLCNT)
2376 aclcnt = &result->acl_default_count;
2377 error = nfsacl_decode(xdr->buf, hdrlen + error, aclcnt, acl);
2378 if (unlikely(error <= 0))
2379 return error;
2380 error = 0;
2381 out:
2382 return error;
2383 }
2384
2385 static int nfs3_xdr_dec_getacl3res(struct rpc_rqst *req,
2386 struct xdr_stream *xdr,
2387 struct nfs3_getaclres *result)
2388 {
2389 enum nfs_stat status;
2390 int error;
2391
2392 error = decode_nfsstat3(xdr, &status);
2393 if (unlikely(error))
2394 goto out;
2395 if (status != NFS3_OK)
2396 goto out_default;
2397 error = decode_getacl3resok(xdr, result);
2398 out:
2399 return error;
2400 out_default:
2401 return nfs_stat_to_errno(status);
2402 }
2403
2404 static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req,
2405 struct xdr_stream *xdr,
2406 struct nfs_fattr *result)
2407 {
2408 enum nfs_stat status;
2409 int error;
2410
2411 error = decode_nfsstat3(xdr, &status);
2412 if (unlikely(error))
2413 goto out;
2414 if (status != NFS3_OK)
2415 goto out_default;
2416 error = decode_post_op_attr(xdr, result);
2417 out:
2418 return error;
2419 out_default:
2420 return nfs_stat_to_errno(status);
2421 }
2422
2423 #endif /* CONFIG_NFS_V3_ACL */
2424
2425 #define PROC(proc, argtype, restype, timer) \
2426 [NFS3PROC_##proc] = { \
2427 .p_proc = NFS3PROC_##proc, \
2428 .p_encode = (kxdreproc_t)nfs3_xdr_enc_##argtype##3args, \
2429 .p_decode = (kxdrdproc_t)nfs3_xdr_dec_##restype##3res, \
2430 .p_arglen = NFS3_##argtype##args_sz, \
2431 .p_replen = NFS3_##restype##res_sz, \
2432 .p_timer = timer, \
2433 .p_statidx = NFS3PROC_##proc, \
2434 .p_name = #proc, \
2435 }
2436
2437 struct rpc_procinfo nfs3_procedures[] = {
2438 PROC(GETATTR, getattr, getattr, 1),
2439 PROC(SETATTR, setattr, setattr, 0),
2440 PROC(LOOKUP, lookup, lookup, 2),
2441 PROC(ACCESS, access, access, 1),
2442 PROC(READLINK, readlink, readlink, 3),
2443 PROC(READ, read, read, 3),
2444 PROC(WRITE, write, write, 4),
2445 PROC(CREATE, create, create, 0),
2446 PROC(MKDIR, mkdir, create, 0),
2447 PROC(SYMLINK, symlink, create, 0),
2448 PROC(MKNOD, mknod, create, 0),
2449 PROC(REMOVE, remove, remove, 0),
2450 PROC(RMDIR, lookup, setattr, 0),
2451 PROC(RENAME, rename, rename, 0),
2452 PROC(LINK, link, link, 0),
2453 PROC(READDIR, readdir, readdir, 3),
2454 PROC(READDIRPLUS, readdirplus, readdir, 3),
2455 PROC(FSSTAT, getattr, fsstat, 0),
2456 PROC(FSINFO, getattr, fsinfo, 0),
2457 PROC(PATHCONF, getattr, pathconf, 0),
2458 PROC(COMMIT, commit, commit, 5),
2459 };
2460
2461 struct rpc_version nfs_version3 = {
2462 .number = 3,
2463 .nrprocs = ARRAY_SIZE(nfs3_procedures),
2464 .procs = nfs3_procedures
2465 };
2466
2467 #ifdef CONFIG_NFS_V3_ACL
2468 static struct rpc_procinfo nfs3_acl_procedures[] = {
2469 [ACLPROC3_GETACL] = {
2470 .p_proc = ACLPROC3_GETACL,
2471 .p_encode = (kxdreproc_t)nfs3_xdr_enc_getacl3args,
2472 .p_decode = (kxdrdproc_t)nfs3_xdr_dec_getacl3res,
2473 .p_arglen = ACL3_getaclargs_sz,
2474 .p_replen = ACL3_getaclres_sz,
2475 .p_timer = 1,
2476 .p_name = "GETACL",
2477 },
2478 [ACLPROC3_SETACL] = {
2479 .p_proc = ACLPROC3_SETACL,
2480 .p_encode = (kxdreproc_t)nfs3_xdr_enc_setacl3args,
2481 .p_decode = (kxdrdproc_t)nfs3_xdr_dec_setacl3res,
2482 .p_arglen = ACL3_setaclargs_sz,
2483 .p_replen = ACL3_setaclres_sz,
2484 .p_timer = 0,
2485 .p_name = "SETACL",
2486 },
2487 };
2488
2489 struct rpc_version nfsacl_version3 = {
2490 .number = 3,
2491 .nrprocs = sizeof(nfs3_acl_procedures)/
2492 sizeof(nfs3_acl_procedures[0]),
2493 .procs = nfs3_acl_procedures,
2494 };
2495 #endif /* CONFIG_NFS_V3_ACL */
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