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Linux 4.19-rc7
[linux-2.6/btrfs-unstable.git] / fs / nfs / nfs3xdr.c
blob64e4fa33d89f0e347155db74507862ec6f09fcc8
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * linux/fs/nfs/nfs3xdr.c
4 *
5 * XDR functions to encode/decode NFSv3 RPC arguments and results.
6 *
7 * Copyright (C) 1996, 1997 Olaf Kirch
8 */
9
10 #include <linux/param.h>
11 #include <linux/time.h>
12 #include <linux/mm.h>
13 #include <linux/errno.h>
14 #include <linux/string.h>
15 #include <linux/in.h>
16 #include <linux/pagemap.h>
17 #include <linux/proc_fs.h>
18 #include <linux/kdev_t.h>
19 #include <linux/sunrpc/clnt.h>
20 #include <linux/nfs.h>
21 #include <linux/nfs3.h>
22 #include <linux/nfs_fs.h>
23 #include <linux/nfsacl.h>
24 #include "internal.h"
25
26 #define NFSDBG_FACILITY NFSDBG_XDR
27
28 /* Mapping from NFS error code to "errno" error code. */
29 #define errno_NFSERR_IO EIO
30
31 /*
32 * Declare the space requirements for NFS arguments and replies as
33 * number of 32bit-words
34 */
35 #define NFS3_fhandle_sz (1+16)
36 #define NFS3_fh_sz (NFS3_fhandle_sz) /* shorthand */
37 #define NFS3_sattr_sz (15)
38 #define NFS3_filename_sz (1+(NFS3_MAXNAMLEN>>2))
39 #define NFS3_path_sz (1+(NFS3_MAXPATHLEN>>2))
40 #define NFS3_fattr_sz (21)
41 #define NFS3_cookieverf_sz (NFS3_COOKIEVERFSIZE>>2)
42 #define NFS3_wcc_attr_sz (6)
43 #define NFS3_pre_op_attr_sz (1+NFS3_wcc_attr_sz)
44 #define NFS3_post_op_attr_sz (1+NFS3_fattr_sz)
45 #define NFS3_wcc_data_sz (NFS3_pre_op_attr_sz+NFS3_post_op_attr_sz)
46 #define NFS3_diropargs_sz (NFS3_fh_sz+NFS3_filename_sz)
47
48 #define NFS3_getattrargs_sz (NFS3_fh_sz)
49 #define NFS3_setattrargs_sz (NFS3_fh_sz+NFS3_sattr_sz+3)
50 #define NFS3_lookupargs_sz (NFS3_fh_sz+NFS3_filename_sz)
51 #define NFS3_accessargs_sz (NFS3_fh_sz+1)
52 #define NFS3_readlinkargs_sz (NFS3_fh_sz)
53 #define NFS3_readargs_sz (NFS3_fh_sz+3)
54 #define NFS3_writeargs_sz (NFS3_fh_sz+5)
55 #define NFS3_createargs_sz (NFS3_diropargs_sz+NFS3_sattr_sz)
56 #define NFS3_mkdirargs_sz (NFS3_diropargs_sz+NFS3_sattr_sz)
57 #define NFS3_symlinkargs_sz (NFS3_diropargs_sz+1+NFS3_sattr_sz)
58 #define NFS3_mknodargs_sz (NFS3_diropargs_sz+2+NFS3_sattr_sz)
59 #define NFS3_removeargs_sz (NFS3_fh_sz+NFS3_filename_sz)
60 #define NFS3_renameargs_sz (NFS3_diropargs_sz+NFS3_diropargs_sz)
61 #define NFS3_linkargs_sz (NFS3_fh_sz+NFS3_diropargs_sz)
62 #define NFS3_readdirargs_sz (NFS3_fh_sz+NFS3_cookieverf_sz+3)
63 #define NFS3_readdirplusargs_sz (NFS3_fh_sz+NFS3_cookieverf_sz+4)
64 #define NFS3_commitargs_sz (NFS3_fh_sz+3)
65
66 #define NFS3_getattrres_sz (1+NFS3_fattr_sz)
67 #define NFS3_setattrres_sz (1+NFS3_wcc_data_sz)
68 #define NFS3_removeres_sz (NFS3_setattrres_sz)
69 #define NFS3_lookupres_sz (1+NFS3_fh_sz+(2 * NFS3_post_op_attr_sz))
70 #define NFS3_accessres_sz (1+NFS3_post_op_attr_sz+1)
71 #define NFS3_readlinkres_sz (1+NFS3_post_op_attr_sz+1)
72 #define NFS3_readres_sz (1+NFS3_post_op_attr_sz+3)
73 #define NFS3_writeres_sz (1+NFS3_wcc_data_sz+4)
74 #define NFS3_createres_sz (1+NFS3_fh_sz+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
75 #define NFS3_renameres_sz (1+(2 * NFS3_wcc_data_sz))
76 #define NFS3_linkres_sz (1+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
77 #define NFS3_readdirres_sz (1+NFS3_post_op_attr_sz+2)
78 #define NFS3_fsstatres_sz (1+NFS3_post_op_attr_sz+13)
79 #define NFS3_fsinfores_sz (1+NFS3_post_op_attr_sz+12)
80 #define NFS3_pathconfres_sz (1+NFS3_post_op_attr_sz+6)
81 #define NFS3_commitres_sz (1+NFS3_wcc_data_sz+2)
82
83 #define ACL3_getaclargs_sz (NFS3_fh_sz+1)
84 #define ACL3_setaclargs_sz (NFS3_fh_sz+1+ \
85 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
86 #define ACL3_getaclres_sz (1+NFS3_post_op_attr_sz+1+ \
87 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
88 #define ACL3_setaclres_sz (1+NFS3_post_op_attr_sz)
89
90 static int nfs3_stat_to_errno(enum nfs_stat);
91
92 /*
93 * Map file type to S_IFMT bits
94 */
95 static const umode_t nfs_type2fmt[] = {
96 [NF3BAD] = 0,
97 [NF3REG] = S_IFREG,
98 [NF3DIR] = S_IFDIR,
99 [NF3BLK] = S_IFBLK,
100 [NF3CHR] = S_IFCHR,
101 [NF3LNK] = S_IFLNK,
102 [NF3SOCK] = S_IFSOCK,
103 [NF3FIFO] = S_IFIFO,
104 };
105
106 /*
107 * While encoding arguments, set up the reply buffer in advance to
108 * receive reply data directly into the page cache.
109 */
110 static void prepare_reply_buffer(struct rpc_rqst *req, struct page **pages,
111 unsigned int base, unsigned int len,
112 unsigned int bufsize)
113 {
114 struct rpc_auth *auth = req->rq_cred->cr_auth;
115 unsigned int replen;
116
117 replen = RPC_REPHDRSIZE + auth->au_rslack + bufsize;
118 xdr_inline_pages(&req->rq_rcv_buf, replen << 2, pages, base, len);
119 }
120
121 /*
122 * Handle decode buffer overflows out-of-line.
123 */
124 static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
125 {
126 dprintk("NFS: %s prematurely hit the end of our receive buffer. "
127 "Remaining buffer length is %tu words.\n",
128 func, xdr->end - xdr->p);
129 }
130
131
132 /*
133 * Encode/decode NFSv3 basic data types
134 *
135 * Basic NFSv3 data types are defined in section 2.5 of RFC 1813:
136 * "NFS Version 3 Protocol Specification".
137 *
138 * Not all basic data types have their own encoding and decoding
139 * functions. For run-time efficiency, some data types are encoded
140 * or decoded inline.
141 */
142
143 static void encode_uint32(struct xdr_stream *xdr, u32 value)
144 {
145 __be32 *p = xdr_reserve_space(xdr, 4);
146 *p = cpu_to_be32(value);
147 }
148
149 static int decode_uint32(struct xdr_stream *xdr, u32 *value)
150 {
151 __be32 *p;
152
153 p = xdr_inline_decode(xdr, 4);
154 if (unlikely(p == NULL))
155 goto out_overflow;
156 *value = be32_to_cpup(p);
157 return 0;
158 out_overflow:
159 print_overflow_msg(__func__, xdr);
160 return -EIO;
161 }
162
163 static int decode_uint64(struct xdr_stream *xdr, u64 *value)
164 {
165 __be32 *p;
166
167 p = xdr_inline_decode(xdr, 8);
168 if (unlikely(p == NULL))
169 goto out_overflow;
170 xdr_decode_hyper(p, value);
171 return 0;
172 out_overflow:
173 print_overflow_msg(__func__, xdr);
174 return -EIO;
175 }
176
177 /*
178 * fileid3
179 *
180 * typedef uint64 fileid3;
181 */
182 static __be32 *xdr_decode_fileid3(__be32 *p, u64 *fileid)
183 {
184 return xdr_decode_hyper(p, fileid);
185 }
186
187 static int decode_fileid3(struct xdr_stream *xdr, u64 *fileid)
188 {
189 return decode_uint64(xdr, fileid);
190 }
191
192 /*
193 * filename3
194 *
195 * typedef string filename3<>;
196 */
197 static void encode_filename3(struct xdr_stream *xdr,
198 const char *name, u32 length)
199 {
200 __be32 *p;
201
202 WARN_ON_ONCE(length > NFS3_MAXNAMLEN);
203 p = xdr_reserve_space(xdr, 4 + length);
204 xdr_encode_opaque(p, name, length);
205 }
206
207 static int decode_inline_filename3(struct xdr_stream *xdr,
208 const char **name, u32 *length)
209 {
210 __be32 *p;
211 u32 count;
212
213 p = xdr_inline_decode(xdr, 4);
214 if (unlikely(p == NULL))
215 goto out_overflow;
216 count = be32_to_cpup(p);
217 if (count > NFS3_MAXNAMLEN)
218 goto out_nametoolong;
219 p = xdr_inline_decode(xdr, count);
220 if (unlikely(p == NULL))
221 goto out_overflow;
222 *name = (const char *)p;
223 *length = count;
224 return 0;
225
226 out_nametoolong:
227 dprintk("NFS: returned filename too long: %u\n", count);
228 return -ENAMETOOLONG;
229 out_overflow:
230 print_overflow_msg(__func__, xdr);
231 return -EIO;
232 }
233
234 /*
235 * nfspath3
236 *
237 * typedef string nfspath3<>;
238 */
239 static void encode_nfspath3(struct xdr_stream *xdr, struct page **pages,
240 const u32 length)
241 {
242 encode_uint32(xdr, length);
243 xdr_write_pages(xdr, pages, 0, length);
244 }
245
246 static int decode_nfspath3(struct xdr_stream *xdr)
247 {
248 u32 recvd, count;
249 __be32 *p;
250
251 p = xdr_inline_decode(xdr, 4);
252 if (unlikely(p == NULL))
253 goto out_overflow;
254 count = be32_to_cpup(p);
255 if (unlikely(count >= xdr->buf->page_len || count > NFS3_MAXPATHLEN))
256 goto out_nametoolong;
257 recvd = xdr_read_pages(xdr, count);
258 if (unlikely(count > recvd))
259 goto out_cheating;
260 xdr_terminate_string(xdr->buf, count);
261 return 0;
262
263 out_nametoolong:
264 dprintk("NFS: returned pathname too long: %u\n", count);
265 return -ENAMETOOLONG;
266 out_cheating:
267 dprintk("NFS: server cheating in pathname result: "
268 "count %u > recvd %u\n", count, recvd);
269 return -EIO;
270 out_overflow:
271 print_overflow_msg(__func__, xdr);
272 return -EIO;
273 }
274
275 /*
276 * cookie3
277 *
278 * typedef uint64 cookie3
279 */
280 static __be32 *xdr_encode_cookie3(__be32 *p, u64 cookie)
281 {
282 return xdr_encode_hyper(p, cookie);
283 }
284
285 static int decode_cookie3(struct xdr_stream *xdr, u64 *cookie)
286 {
287 return decode_uint64(xdr, cookie);
288 }
289
290 /*
291 * cookieverf3
292 *
293 * typedef opaque cookieverf3[NFS3_COOKIEVERFSIZE];
294 */
295 static __be32 *xdr_encode_cookieverf3(__be32 *p, const __be32 *verifier)
296 {
297 memcpy(p, verifier, NFS3_COOKIEVERFSIZE);
298 return p + XDR_QUADLEN(NFS3_COOKIEVERFSIZE);
299 }
300
301 static int decode_cookieverf3(struct xdr_stream *xdr, __be32 *verifier)
302 {
303 __be32 *p;
304
305 p = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE);
306 if (unlikely(p == NULL))
307 goto out_overflow;
308 memcpy(verifier, p, NFS3_COOKIEVERFSIZE);
309 return 0;
310 out_overflow:
311 print_overflow_msg(__func__, xdr);
312 return -EIO;
313 }
314
315 /*
316 * createverf3
317 *
318 * typedef opaque createverf3[NFS3_CREATEVERFSIZE];
319 */
320 static void encode_createverf3(struct xdr_stream *xdr, const __be32 *verifier)
321 {
322 __be32 *p;
323
324 p = xdr_reserve_space(xdr, NFS3_CREATEVERFSIZE);
325 memcpy(p, verifier, NFS3_CREATEVERFSIZE);
326 }
327
328 static int decode_writeverf3(struct xdr_stream *xdr, struct nfs_write_verifier *verifier)
329 {
330 __be32 *p;
331
332 p = xdr_inline_decode(xdr, NFS3_WRITEVERFSIZE);
333 if (unlikely(p == NULL))
334 goto out_overflow;
335 memcpy(verifier->data, p, NFS3_WRITEVERFSIZE);
336 return 0;
337 out_overflow:
338 print_overflow_msg(__func__, xdr);
339 return -EIO;
340 }
341
342 /*
343 * size3
344 *
345 * typedef uint64 size3;
346 */
347 static __be32 *xdr_decode_size3(__be32 *p, u64 *size)
348 {
349 return xdr_decode_hyper(p, size);
350 }
351
352 /*
353 * nfsstat3
354 *
355 * enum nfsstat3 {
356 * NFS3_OK = 0,
357 * ...
358 * }
359 */
360 #define NFS3_OK NFS_OK
361
362 static int decode_nfsstat3(struct xdr_stream *xdr, enum nfs_stat *status)
363 {
364 __be32 *p;
365
366 p = xdr_inline_decode(xdr, 4);
367 if (unlikely(p == NULL))
368 goto out_overflow;
369 *status = be32_to_cpup(p);
370 return 0;
371 out_overflow:
372 print_overflow_msg(__func__, xdr);
373 return -EIO;
374 }
375
376 /*
377 * ftype3
378 *
379 * enum ftype3 {
380 * NF3REG = 1,
381 * NF3DIR = 2,
382 * NF3BLK = 3,
383 * NF3CHR = 4,
384 * NF3LNK = 5,
385 * NF3SOCK = 6,
386 * NF3FIFO = 7
387 * };
388 */
389 static void encode_ftype3(struct xdr_stream *xdr, const u32 type)
390 {
391 encode_uint32(xdr, type);
392 }
393
394 static __be32 *xdr_decode_ftype3(__be32 *p, umode_t *mode)
395 {
396 u32 type;
397
398 type = be32_to_cpup(p++);
399 if (type > NF3FIFO)
400 type = NF3NON;
401 *mode = nfs_type2fmt[type];
402 return p;
403 }
404
405 /*
406 * specdata3
407 *
408 * struct specdata3 {
409 * uint32 specdata1;
410 * uint32 specdata2;
411 * };
412 */
413 static void encode_specdata3(struct xdr_stream *xdr, const dev_t rdev)
414 {
415 __be32 *p;
416
417 p = xdr_reserve_space(xdr, 8);
418 *p++ = cpu_to_be32(MAJOR(rdev));
419 *p = cpu_to_be32(MINOR(rdev));
420 }
421
422 static __be32 *xdr_decode_specdata3(__be32 *p, dev_t *rdev)
423 {
424 unsigned int major, minor;
425
426 major = be32_to_cpup(p++);
427 minor = be32_to_cpup(p++);
428 *rdev = MKDEV(major, minor);
429 if (MAJOR(*rdev) != major || MINOR(*rdev) != minor)
430 *rdev = 0;
431 return p;
432 }
433
434 /*
435 * nfs_fh3
436 *
437 * struct nfs_fh3 {
438 * opaque data<NFS3_FHSIZE>;
439 * };
440 */
441 static void encode_nfs_fh3(struct xdr_stream *xdr, const struct nfs_fh *fh)
442 {
443 __be32 *p;
444
445 WARN_ON_ONCE(fh->size > NFS3_FHSIZE);
446 p = xdr_reserve_space(xdr, 4 + fh->size);
447 xdr_encode_opaque(p, fh->data, fh->size);
448 }
449
450 static int decode_nfs_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
451 {
452 u32 length;
453 __be32 *p;
454
455 p = xdr_inline_decode(xdr, 4);
456 if (unlikely(p == NULL))
457 goto out_overflow;
458 length = be32_to_cpup(p++);
459 if (unlikely(length > NFS3_FHSIZE))
460 goto out_toobig;
461 p = xdr_inline_decode(xdr, length);
462 if (unlikely(p == NULL))
463 goto out_overflow;
464 fh->size = length;
465 memcpy(fh->data, p, length);
466 return 0;
467 out_toobig:
468 dprintk("NFS: file handle size (%u) too big\n", length);
469 return -E2BIG;
470 out_overflow:
471 print_overflow_msg(__func__, xdr);
472 return -EIO;
473 }
474
475 static void zero_nfs_fh3(struct nfs_fh *fh)
476 {
477 memset(fh, 0, sizeof(*fh));
478 }
479
480 /*
481 * nfstime3
482 *
483 * struct nfstime3 {
484 * uint32 seconds;
485 * uint32 nseconds;
486 * };
487 */
488 static __be32 *xdr_encode_nfstime3(__be32 *p, const struct timespec *timep)
489 {
490 *p++ = cpu_to_be32(timep->tv_sec);
491 *p++ = cpu_to_be32(timep->tv_nsec);
492 return p;
493 }
494
495 static __be32 *xdr_decode_nfstime3(__be32 *p, struct timespec *timep)
496 {
497 timep->tv_sec = be32_to_cpup(p++);
498 timep->tv_nsec = be32_to_cpup(p++);
499 return p;
500 }
501
502 /*
503 * sattr3
504 *
505 * enum time_how {
506 * DONT_CHANGE = 0,
507 * SET_TO_SERVER_TIME = 1,
508 * SET_TO_CLIENT_TIME = 2
509 * };
510 *
511 * union set_mode3 switch (bool set_it) {
512 * case TRUE:
513 * mode3 mode;
514 * default:
515 * void;
516 * };
517 *
518 * union set_uid3 switch (bool set_it) {
519 * case TRUE:
520 * uid3 uid;
521 * default:
522 * void;
523 * };
524 *
525 * union set_gid3 switch (bool set_it) {
526 * case TRUE:
527 * gid3 gid;
528 * default:
529 * void;
530 * };
531 *
532 * union set_size3 switch (bool set_it) {
533 * case TRUE:
534 * size3 size;
535 * default:
536 * void;
537 * };
538 *
539 * union set_atime switch (time_how set_it) {
540 * case SET_TO_CLIENT_TIME:
541 * nfstime3 atime;
542 * default:
543 * void;
544 * };
545 *
546 * union set_mtime switch (time_how set_it) {
547 * case SET_TO_CLIENT_TIME:
548 * nfstime3 mtime;
549 * default:
550 * void;
551 * };
552 *
553 * struct sattr3 {
554 * set_mode3 mode;
555 * set_uid3 uid;
556 * set_gid3 gid;
557 * set_size3 size;
558 * set_atime atime;
559 * set_mtime mtime;
560 * };
561 */
562 static void encode_sattr3(struct xdr_stream *xdr, const struct iattr *attr)
563 {
564 struct timespec ts;
565 u32 nbytes;
566 __be32 *p;
567
568 /*
569 * In order to make only a single xdr_reserve_space() call,
570 * pre-compute the total number of bytes to be reserved.
571 * Six boolean values, one for each set_foo field, are always
572 * present in the encoded result, so start there.
573 */
574 nbytes = 6 * 4;
575 if (attr->ia_valid & ATTR_MODE)
576 nbytes += 4;
577 if (attr->ia_valid & ATTR_UID)
578 nbytes += 4;
579 if (attr->ia_valid & ATTR_GID)
580 nbytes += 4;
581 if (attr->ia_valid & ATTR_SIZE)
582 nbytes += 8;
583 if (attr->ia_valid & ATTR_ATIME_SET)
584 nbytes += 8;
585 if (attr->ia_valid & ATTR_MTIME_SET)
586 nbytes += 8;
587 p = xdr_reserve_space(xdr, nbytes);
588
589 if (attr->ia_valid & ATTR_MODE) {
590 *p++ = xdr_one;
591 *p++ = cpu_to_be32(attr->ia_mode & S_IALLUGO);
592 } else
593 *p++ = xdr_zero;
594
595 if (attr->ia_valid & ATTR_UID) {
596 *p++ = xdr_one;
597 *p++ = cpu_to_be32(from_kuid(&init_user_ns, attr->ia_uid));
598 } else
599 *p++ = xdr_zero;
600
601 if (attr->ia_valid & ATTR_GID) {
602 *p++ = xdr_one;
603 *p++ = cpu_to_be32(from_kgid(&init_user_ns, attr->ia_gid));
604 } else
605 *p++ = xdr_zero;
606
607 if (attr->ia_valid & ATTR_SIZE) {
608 *p++ = xdr_one;
609 p = xdr_encode_hyper(p, (u64)attr->ia_size);
610 } else
611 *p++ = xdr_zero;
612
613 if (attr->ia_valid & ATTR_ATIME_SET) {
614 struct timespec ts;
615 *p++ = xdr_two;
616 ts = timespec64_to_timespec(attr->ia_atime);
617 p = xdr_encode_nfstime3(p, &ts);
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 ts = timespec64_to_timespec(attr->ia_mtime);
626 xdr_encode_nfstime3(p, &ts);
627 } else if (attr->ia_valid & ATTR_MTIME) {
628 *p = xdr_one;
629 } else
630 *p = xdr_zero;
631 }
632
633 /*
634 * fattr3
635 *
636 * struct fattr3 {
637 * ftype3 type;
638 * mode3 mode;
639 * uint32 nlink;
640 * uid3 uid;
641 * gid3 gid;
642 * size3 size;
643 * size3 used;
644 * specdata3 rdev;
645 * uint64 fsid;
646 * fileid3 fileid;
647 * nfstime3 atime;
648 * nfstime3 mtime;
649 * nfstime3 ctime;
650 * };
651 */
652 static int decode_fattr3(struct xdr_stream *xdr, struct nfs_fattr *fattr)
653 {
654 umode_t fmode;
655 __be32 *p;
656
657 p = xdr_inline_decode(xdr, NFS3_fattr_sz << 2);
658 if (unlikely(p == NULL))
659 goto out_overflow;
660
661 p = xdr_decode_ftype3(p, &fmode);
662
663 fattr->mode = (be32_to_cpup(p++) & ~S_IFMT) | fmode;
664 fattr->nlink = be32_to_cpup(p++);
665 fattr->uid = make_kuid(&init_user_ns, be32_to_cpup(p++));
666 if (!uid_valid(fattr->uid))
667 goto out_uid;
668 fattr->gid = make_kgid(&init_user_ns, be32_to_cpup(p++));
669 if (!gid_valid(fattr->gid))
670 goto out_gid;
671
672 p = xdr_decode_size3(p, &fattr->size);
673 p = xdr_decode_size3(p, &fattr->du.nfs3.used);
674 p = xdr_decode_specdata3(p, &fattr->rdev);
675
676 p = xdr_decode_hyper(p, &fattr->fsid.major);
677 fattr->fsid.minor = 0;
678
679 p = xdr_decode_fileid3(p, &fattr->fileid);
680 p = xdr_decode_nfstime3(p, &fattr->atime);
681 p = xdr_decode_nfstime3(p, &fattr->mtime);
682 xdr_decode_nfstime3(p, &fattr->ctime);
683 fattr->change_attr = nfs_timespec_to_change_attr(&fattr->ctime);
684
685 fattr->valid |= NFS_ATTR_FATTR_V3;
686 return 0;
687 out_uid:
688 dprintk("NFS: returned invalid uid\n");
689 return -EINVAL;
690 out_gid:
691 dprintk("NFS: returned invalid gid\n");
692 return -EINVAL;
693 out_overflow:
694 print_overflow_msg(__func__, xdr);
695 return -EIO;
696 }
697
698 /*
699 * post_op_attr
700 *
701 * union post_op_attr switch (bool attributes_follow) {
702 * case TRUE:
703 * fattr3 attributes;
704 * case FALSE:
705 * void;
706 * };
707 */
708 static int decode_post_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
709 {
710 __be32 *p;
711
712 p = xdr_inline_decode(xdr, 4);
713 if (unlikely(p == NULL))
714 goto out_overflow;
715 if (*p != xdr_zero)
716 return decode_fattr3(xdr, fattr);
717 return 0;
718 out_overflow:
719 print_overflow_msg(__func__, xdr);
720 return -EIO;
721 }
722
723 /*
724 * wcc_attr
725 * struct wcc_attr {
726 * size3 size;
727 * nfstime3 mtime;
728 * nfstime3 ctime;
729 * };
730 */
731 static int decode_wcc_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
732 {
733 __be32 *p;
734
735 p = xdr_inline_decode(xdr, NFS3_wcc_attr_sz << 2);
736 if (unlikely(p == NULL))
737 goto out_overflow;
738
739 fattr->valid |= NFS_ATTR_FATTR_PRESIZE
740 | NFS_ATTR_FATTR_PRECHANGE
741 | NFS_ATTR_FATTR_PREMTIME
742 | NFS_ATTR_FATTR_PRECTIME;
743
744 p = xdr_decode_size3(p, &fattr->pre_size);
745 p = xdr_decode_nfstime3(p, &fattr->pre_mtime);
746 xdr_decode_nfstime3(p, &fattr->pre_ctime);
747 fattr->pre_change_attr = nfs_timespec_to_change_attr(&fattr->pre_ctime);
748
749 return 0;
750 out_overflow:
751 print_overflow_msg(__func__, xdr);
752 return -EIO;
753 }
754
755 /*
756 * pre_op_attr
757 * union pre_op_attr switch (bool attributes_follow) {
758 * case TRUE:
759 * wcc_attr attributes;
760 * case FALSE:
761 * void;
762 * };
763 *
764 * wcc_data
765 *
766 * struct wcc_data {
767 * pre_op_attr before;
768 * post_op_attr after;
769 * };
770 */
771 static int decode_pre_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
772 {
773 __be32 *p;
774
775 p = xdr_inline_decode(xdr, 4);
776 if (unlikely(p == NULL))
777 goto out_overflow;
778 if (*p != xdr_zero)
779 return decode_wcc_attr(xdr, fattr);
780 return 0;
781 out_overflow:
782 print_overflow_msg(__func__, xdr);
783 return -EIO;
784 }
785
786 static int decode_wcc_data(struct xdr_stream *xdr, struct nfs_fattr *fattr)
787 {
788 int error;
789
790 error = decode_pre_op_attr(xdr, fattr);
791 if (unlikely(error))
792 goto out;
793 error = decode_post_op_attr(xdr, fattr);
794 out:
795 return error;
796 }
797
798 /*
799 * post_op_fh3
800 *
801 * union post_op_fh3 switch (bool handle_follows) {
802 * case TRUE:
803 * nfs_fh3 handle;
804 * case FALSE:
805 * void;
806 * };
807 */
808 static int decode_post_op_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
809 {
810 __be32 *p = xdr_inline_decode(xdr, 4);
811 if (unlikely(p == NULL))
812 goto out_overflow;
813 if (*p != xdr_zero)
814 return decode_nfs_fh3(xdr, fh);
815 zero_nfs_fh3(fh);
816 return 0;
817 out_overflow:
818 print_overflow_msg(__func__, xdr);
819 return -EIO;
820 }
821
822 /*
823 * diropargs3
824 *
825 * struct diropargs3 {
826 * nfs_fh3 dir;
827 * filename3 name;
828 * };
829 */
830 static void encode_diropargs3(struct xdr_stream *xdr, const struct nfs_fh *fh,
831 const char *name, u32 length)
832 {
833 encode_nfs_fh3(xdr, fh);
834 encode_filename3(xdr, name, length);
835 }
836
837
838 /*
839 * NFSv3 XDR encode functions
840 *
841 * NFSv3 argument types are defined in section 3.3 of RFC 1813:
842 * "NFS Version 3 Protocol Specification".
843 */
844
845 /*
846 * 3.3.1 GETATTR3args
847 *
848 * struct GETATTR3args {
849 * nfs_fh3 object;
850 * };
851 */
852 static void nfs3_xdr_enc_getattr3args(struct rpc_rqst *req,
853 struct xdr_stream *xdr,
854 const void *data)
855 {
856 const struct nfs_fh *fh = data;
857
858 encode_nfs_fh3(xdr, fh);
859 }
860
861 /*
862 * 3.3.2 SETATTR3args
863 *
864 * union sattrguard3 switch (bool check) {
865 * case TRUE:
866 * nfstime3 obj_ctime;
867 * case FALSE:
868 * void;
869 * };
870 *
871 * struct SETATTR3args {
872 * nfs_fh3 object;
873 * sattr3 new_attributes;
874 * sattrguard3 guard;
875 * };
876 */
877 static void encode_sattrguard3(struct xdr_stream *xdr,
878 const struct nfs3_sattrargs *args)
879 {
880 __be32 *p;
881
882 if (args->guard) {
883 p = xdr_reserve_space(xdr, 4 + 8);
884 *p++ = xdr_one;
885 xdr_encode_nfstime3(p, &args->guardtime);
886 } else {
887 p = xdr_reserve_space(xdr, 4);
888 *p = xdr_zero;
889 }
890 }
891
892 static void nfs3_xdr_enc_setattr3args(struct rpc_rqst *req,
893 struct xdr_stream *xdr,
894 const void *data)
895 {
896 const struct nfs3_sattrargs *args = data;
897 encode_nfs_fh3(xdr, args->fh);
898 encode_sattr3(xdr, args->sattr);
899 encode_sattrguard3(xdr, args);
900 }
901
902 /*
903 * 3.3.3 LOOKUP3args
904 *
905 * struct LOOKUP3args {
906 * diropargs3 what;
907 * };
908 */
909 static void nfs3_xdr_enc_lookup3args(struct rpc_rqst *req,
910 struct xdr_stream *xdr,
911 const void *data)
912 {
913 const struct nfs3_diropargs *args = data;
914
915 encode_diropargs3(xdr, args->fh, args->name, args->len);
916 }
917
918 /*
919 * 3.3.4 ACCESS3args
920 *
921 * struct ACCESS3args {
922 * nfs_fh3 object;
923 * uint32 access;
924 * };
925 */
926 static void encode_access3args(struct xdr_stream *xdr,
927 const struct nfs3_accessargs *args)
928 {
929 encode_nfs_fh3(xdr, args->fh);
930 encode_uint32(xdr, args->access);
931 }
932
933 static void nfs3_xdr_enc_access3args(struct rpc_rqst *req,
934 struct xdr_stream *xdr,
935 const void *data)
936 {
937 const struct nfs3_accessargs *args = data;
938
939 encode_access3args(xdr, args);
940 }
941
942 /*
943 * 3.3.5 READLINK3args
944 *
945 * struct READLINK3args {
946 * nfs_fh3 symlink;
947 * };
948 */
949 static void nfs3_xdr_enc_readlink3args(struct rpc_rqst *req,
950 struct xdr_stream *xdr,
951 const void *data)
952 {
953 const struct nfs3_readlinkargs *args = data;
954
955 encode_nfs_fh3(xdr, args->fh);
956 prepare_reply_buffer(req, args->pages, args->pgbase,
957 args->pglen, NFS3_readlinkres_sz);
958 }
959
960 /*
961 * 3.3.6 READ3args
962 *
963 * struct READ3args {
964 * nfs_fh3 file;
965 * offset3 offset;
966 * count3 count;
967 * };
968 */
969 static void encode_read3args(struct xdr_stream *xdr,
970 const struct nfs_pgio_args *args)
971 {
972 __be32 *p;
973
974 encode_nfs_fh3(xdr, args->fh);
975
976 p = xdr_reserve_space(xdr, 8 + 4);
977 p = xdr_encode_hyper(p, args->offset);
978 *p = cpu_to_be32(args->count);
979 }
980
981 static void nfs3_xdr_enc_read3args(struct rpc_rqst *req,
982 struct xdr_stream *xdr,
983 const void *data)
984 {
985 const struct nfs_pgio_args *args = data;
986
987 encode_read3args(xdr, args);
988 prepare_reply_buffer(req, args->pages, args->pgbase,
989 args->count, NFS3_readres_sz);
990 req->rq_rcv_buf.flags |= XDRBUF_READ;
991 }
992
993 /*
994 * 3.3.7 WRITE3args
995 *
996 * enum stable_how {
997 * UNSTABLE = 0,
998 * DATA_SYNC = 1,
999 * FILE_SYNC = 2
1000 * };
1001 *
1002 * struct WRITE3args {
1003 * nfs_fh3 file;
1004 * offset3 offset;
1005 * count3 count;
1006 * stable_how stable;
1007 * opaque data<>;
1008 * };
1009 */
1010 static void encode_write3args(struct xdr_stream *xdr,
1011 const struct nfs_pgio_args *args)
1012 {
1013 __be32 *p;
1014
1015 encode_nfs_fh3(xdr, args->fh);
1016
1017 p = xdr_reserve_space(xdr, 8 + 4 + 4 + 4);
1018 p = xdr_encode_hyper(p, args->offset);
1019 *p++ = cpu_to_be32(args->count);
1020 *p++ = cpu_to_be32(args->stable);
1021 *p = cpu_to_be32(args->count);
1022 xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
1023 }
1024
1025 static void nfs3_xdr_enc_write3args(struct rpc_rqst *req,
1026 struct xdr_stream *xdr,
1027 const void *data)
1028 {
1029 const struct nfs_pgio_args *args = data;
1030
1031 encode_write3args(xdr, args);
1032 xdr->buf->flags |= XDRBUF_WRITE;
1033 }
1034
1035 /*
1036 * 3.3.8 CREATE3args
1037 *
1038 * enum createmode3 {
1039 * UNCHECKED = 0,
1040 * GUARDED = 1,
1041 * EXCLUSIVE = 2
1042 * };
1043 *
1044 * union createhow3 switch (createmode3 mode) {
1045 * case UNCHECKED:
1046 * case GUARDED:
1047 * sattr3 obj_attributes;
1048 * case EXCLUSIVE:
1049 * createverf3 verf;
1050 * };
1051 *
1052 * struct CREATE3args {
1053 * diropargs3 where;
1054 * createhow3 how;
1055 * };
1056 */
1057 static void encode_createhow3(struct xdr_stream *xdr,
1058 const struct nfs3_createargs *args)
1059 {
1060 encode_uint32(xdr, args->createmode);
1061 switch (args->createmode) {
1062 case NFS3_CREATE_UNCHECKED:
1063 case NFS3_CREATE_GUARDED:
1064 encode_sattr3(xdr, args->sattr);
1065 break;
1066 case NFS3_CREATE_EXCLUSIVE:
1067 encode_createverf3(xdr, args->verifier);
1068 break;
1069 default:
1070 BUG();
1071 }
1072 }
1073
1074 static void nfs3_xdr_enc_create3args(struct rpc_rqst *req,
1075 struct xdr_stream *xdr,
1076 const void *data)
1077 {
1078 const struct nfs3_createargs *args = data;
1079
1080 encode_diropargs3(xdr, args->fh, args->name, args->len);
1081 encode_createhow3(xdr, args);
1082 }
1083
1084 /*
1085 * 3.3.9 MKDIR3args
1086 *
1087 * struct MKDIR3args {
1088 * diropargs3 where;
1089 * sattr3 attributes;
1090 * };
1091 */
1092 static void nfs3_xdr_enc_mkdir3args(struct rpc_rqst *req,
1093 struct xdr_stream *xdr,
1094 const void *data)
1095 {
1096 const struct nfs3_mkdirargs *args = data;
1097
1098 encode_diropargs3(xdr, args->fh, args->name, args->len);
1099 encode_sattr3(xdr, args->sattr);
1100 }
1101
1102 /*
1103 * 3.3.10 SYMLINK3args
1104 *
1105 * struct symlinkdata3 {
1106 * sattr3 symlink_attributes;
1107 * nfspath3 symlink_data;
1108 * };
1109 *
1110 * struct SYMLINK3args {
1111 * diropargs3 where;
1112 * symlinkdata3 symlink;
1113 * };
1114 */
1115 static void encode_symlinkdata3(struct xdr_stream *xdr,
1116 const void *data)
1117 {
1118 const struct nfs3_symlinkargs *args = data;
1119
1120 encode_sattr3(xdr, args->sattr);
1121 encode_nfspath3(xdr, args->pages, args->pathlen);
1122 }
1123
1124 static void nfs3_xdr_enc_symlink3args(struct rpc_rqst *req,
1125 struct xdr_stream *xdr,
1126 const void *data)
1127 {
1128 const struct nfs3_symlinkargs *args = data;
1129
1130 encode_diropargs3(xdr, args->fromfh, args->fromname, args->fromlen);
1131 encode_symlinkdata3(xdr, args);
1132 xdr->buf->flags |= XDRBUF_WRITE;
1133 }
1134
1135 /*
1136 * 3.3.11 MKNOD3args
1137 *
1138 * struct devicedata3 {
1139 * sattr3 dev_attributes;
1140 * specdata3 spec;
1141 * };
1142 *
1143 * union mknoddata3 switch (ftype3 type) {
1144 * case NF3CHR:
1145 * case NF3BLK:
1146 * devicedata3 device;
1147 * case NF3SOCK:
1148 * case NF3FIFO:
1149 * sattr3 pipe_attributes;
1150 * default:
1151 * void;
1152 * };
1153 *
1154 * struct MKNOD3args {
1155 * diropargs3 where;
1156 * mknoddata3 what;
1157 * };
1158 */
1159 static void encode_devicedata3(struct xdr_stream *xdr,
1160 const struct nfs3_mknodargs *args)
1161 {
1162 encode_sattr3(xdr, args->sattr);
1163 encode_specdata3(xdr, args->rdev);
1164 }
1165
1166 static void encode_mknoddata3(struct xdr_stream *xdr,
1167 const struct nfs3_mknodargs *args)
1168 {
1169 encode_ftype3(xdr, args->type);
1170 switch (args->type) {
1171 case NF3CHR:
1172 case NF3BLK:
1173 encode_devicedata3(xdr, args);
1174 break;
1175 case NF3SOCK:
1176 case NF3FIFO:
1177 encode_sattr3(xdr, args->sattr);
1178 break;
1179 case NF3REG:
1180 case NF3DIR:
1181 break;
1182 default:
1183 BUG();
1184 }
1185 }
1186
1187 static void nfs3_xdr_enc_mknod3args(struct rpc_rqst *req,
1188 struct xdr_stream *xdr,
1189 const void *data)
1190 {
1191 const struct nfs3_mknodargs *args = data;
1192
1193 encode_diropargs3(xdr, args->fh, args->name, args->len);
1194 encode_mknoddata3(xdr, args);
1195 }
1196
1197 /*
1198 * 3.3.12 REMOVE3args
1199 *
1200 * struct REMOVE3args {
1201 * diropargs3 object;
1202 * };
1203 */
1204 static void nfs3_xdr_enc_remove3args(struct rpc_rqst *req,
1205 struct xdr_stream *xdr,
1206 const void *data)
1207 {
1208 const struct nfs_removeargs *args = data;
1209
1210 encode_diropargs3(xdr, args->fh, args->name.name, args->name.len);
1211 }
1212
1213 /*
1214 * 3.3.14 RENAME3args
1215 *
1216 * struct RENAME3args {
1217 * diropargs3 from;
1218 * diropargs3 to;
1219 * };
1220 */
1221 static void nfs3_xdr_enc_rename3args(struct rpc_rqst *req,
1222 struct xdr_stream *xdr,
1223 const void *data)
1224 {
1225 const struct nfs_renameargs *args = data;
1226 const struct qstr *old = args->old_name;
1227 const struct qstr *new = args->new_name;
1228
1229 encode_diropargs3(xdr, args->old_dir, old->name, old->len);
1230 encode_diropargs3(xdr, args->new_dir, new->name, new->len);
1231 }
1232
1233 /*
1234 * 3.3.15 LINK3args
1235 *
1236 * struct LINK3args {
1237 * nfs_fh3 file;
1238 * diropargs3 link;
1239 * };
1240 */
1241 static void nfs3_xdr_enc_link3args(struct rpc_rqst *req,
1242 struct xdr_stream *xdr,
1243 const void *data)
1244 {
1245 const struct nfs3_linkargs *args = data;
1246
1247 encode_nfs_fh3(xdr, args->fromfh);
1248 encode_diropargs3(xdr, args->tofh, args->toname, args->tolen);
1249 }
1250
1251 /*
1252 * 3.3.16 READDIR3args
1253 *
1254 * struct READDIR3args {
1255 * nfs_fh3 dir;
1256 * cookie3 cookie;
1257 * cookieverf3 cookieverf;
1258 * count3 count;
1259 * };
1260 */
1261 static void encode_readdir3args(struct xdr_stream *xdr,
1262 const struct nfs3_readdirargs *args)
1263 {
1264 __be32 *p;
1265
1266 encode_nfs_fh3(xdr, args->fh);
1267
1268 p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4);
1269 p = xdr_encode_cookie3(p, args->cookie);
1270 p = xdr_encode_cookieverf3(p, args->verf);
1271 *p = cpu_to_be32(args->count);
1272 }
1273
1274 static void nfs3_xdr_enc_readdir3args(struct rpc_rqst *req,
1275 struct xdr_stream *xdr,
1276 const void *data)
1277 {
1278 const struct nfs3_readdirargs *args = data;
1279
1280 encode_readdir3args(xdr, args);
1281 prepare_reply_buffer(req, args->pages, 0,
1282 args->count, NFS3_readdirres_sz);
1283 }
1284
1285 /*
1286 * 3.3.17 READDIRPLUS3args
1287 *
1288 * struct READDIRPLUS3args {
1289 * nfs_fh3 dir;
1290 * cookie3 cookie;
1291 * cookieverf3 cookieverf;
1292 * count3 dircount;
1293 * count3 maxcount;
1294 * };
1295 */
1296 static void encode_readdirplus3args(struct xdr_stream *xdr,
1297 const struct nfs3_readdirargs *args)
1298 {
1299 __be32 *p;
1300
1301 encode_nfs_fh3(xdr, args->fh);
1302
1303 p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4 + 4);
1304 p = xdr_encode_cookie3(p, args->cookie);
1305 p = xdr_encode_cookieverf3(p, args->verf);
1306
1307 /*
1308 * readdirplus: need dircount + buffer size.
1309 * We just make sure we make dircount big enough
1310 */
1311 *p++ = cpu_to_be32(args->count >> 3);
1312
1313 *p = cpu_to_be32(args->count);
1314 }
1315
1316 static void nfs3_xdr_enc_readdirplus3args(struct rpc_rqst *req,
1317 struct xdr_stream *xdr,
1318 const void *data)
1319 {
1320 const struct nfs3_readdirargs *args = data;
1321
1322 encode_readdirplus3args(xdr, args);
1323 prepare_reply_buffer(req, args->pages, 0,
1324 args->count, NFS3_readdirres_sz);
1325 }
1326
1327 /*
1328 * 3.3.21 COMMIT3args
1329 *
1330 * struct COMMIT3args {
1331 * nfs_fh3 file;
1332 * offset3 offset;
1333 * count3 count;
1334 * };
1335 */
1336 static void encode_commit3args(struct xdr_stream *xdr,
1337 const struct nfs_commitargs *args)
1338 {
1339 __be32 *p;
1340
1341 encode_nfs_fh3(xdr, args->fh);
1342
1343 p = xdr_reserve_space(xdr, 8 + 4);
1344 p = xdr_encode_hyper(p, args->offset);
1345 *p = cpu_to_be32(args->count);
1346 }
1347
1348 static void nfs3_xdr_enc_commit3args(struct rpc_rqst *req,
1349 struct xdr_stream *xdr,
1350 const void *data)
1351 {
1352 const struct nfs_commitargs *args = data;
1353
1354 encode_commit3args(xdr, args);
1355 }
1356
1357 #ifdef CONFIG_NFS_V3_ACL
1358
1359 static void nfs3_xdr_enc_getacl3args(struct rpc_rqst *req,
1360 struct xdr_stream *xdr,
1361 const void *data)
1362 {
1363 const struct nfs3_getaclargs *args = data;
1364
1365 encode_nfs_fh3(xdr, args->fh);
1366 encode_uint32(xdr, args->mask);
1367 if (args->mask & (NFS_ACL | NFS_DFACL))
1368 prepare_reply_buffer(req, args->pages, 0,
1369 NFSACL_MAXPAGES << PAGE_SHIFT,
1370 ACL3_getaclres_sz);
1371 }
1372
1373 static void nfs3_xdr_enc_setacl3args(struct rpc_rqst *req,
1374 struct xdr_stream *xdr,
1375 const void *data)
1376 {
1377 const struct nfs3_setaclargs *args = data;
1378 unsigned int base;
1379 int error;
1380
1381 encode_nfs_fh3(xdr, NFS_FH(args->inode));
1382 encode_uint32(xdr, args->mask);
1383
1384 base = req->rq_slen;
1385 if (args->npages != 0)
1386 xdr_write_pages(xdr, args->pages, 0, args->len);
1387 else
1388 xdr_reserve_space(xdr, args->len);
1389
1390 error = nfsacl_encode(xdr->buf, base, args->inode,
1391 (args->mask & NFS_ACL) ?
1392 args->acl_access : NULL, 1, 0);
1393 /* FIXME: this is just broken */
1394 BUG_ON(error < 0);
1395 error = nfsacl_encode(xdr->buf, base + error, args->inode,
1396 (args->mask & NFS_DFACL) ?
1397 args->acl_default : NULL, 1,
1398 NFS_ACL_DEFAULT);
1399 BUG_ON(error < 0);
1400 }
1401
1402 #endif /* CONFIG_NFS_V3_ACL */
1403
1404 /*
1405 * NFSv3 XDR decode functions
1406 *
1407 * NFSv3 result types are defined in section 3.3 of RFC 1813:
1408 * "NFS Version 3 Protocol Specification".
1409 */
1410
1411 /*
1412 * 3.3.1 GETATTR3res
1413 *
1414 * struct GETATTR3resok {
1415 * fattr3 obj_attributes;
1416 * };
1417 *
1418 * union GETATTR3res switch (nfsstat3 status) {
1419 * case NFS3_OK:
1420 * GETATTR3resok resok;
1421 * default:
1422 * void;
1423 * };
1424 */
1425 static int nfs3_xdr_dec_getattr3res(struct rpc_rqst *req,
1426 struct xdr_stream *xdr,
1427 void *result)
1428 {
1429 enum nfs_stat status;
1430 int error;
1431
1432 error = decode_nfsstat3(xdr, &status);
1433 if (unlikely(error))
1434 goto out;
1435 if (status != NFS3_OK)
1436 goto out_default;
1437 error = decode_fattr3(xdr, result);
1438 out:
1439 return error;
1440 out_default:
1441 return nfs3_stat_to_errno(status);
1442 }
1443
1444 /*
1445 * 3.3.2 SETATTR3res
1446 *
1447 * struct SETATTR3resok {
1448 * wcc_data obj_wcc;
1449 * };
1450 *
1451 * struct SETATTR3resfail {
1452 * wcc_data obj_wcc;
1453 * };
1454 *
1455 * union SETATTR3res switch (nfsstat3 status) {
1456 * case NFS3_OK:
1457 * SETATTR3resok resok;
1458 * default:
1459 * SETATTR3resfail resfail;
1460 * };
1461 */
1462 static int nfs3_xdr_dec_setattr3res(struct rpc_rqst *req,
1463 struct xdr_stream *xdr,
1464 void *result)
1465 {
1466 enum nfs_stat status;
1467 int error;
1468
1469 error = decode_nfsstat3(xdr, &status);
1470 if (unlikely(error))
1471 goto out;
1472 error = decode_wcc_data(xdr, result);
1473 if (unlikely(error))
1474 goto out;
1475 if (status != NFS3_OK)
1476 goto out_status;
1477 out:
1478 return error;
1479 out_status:
1480 return nfs3_stat_to_errno(status);
1481 }
1482
1483 /*
1484 * 3.3.3 LOOKUP3res
1485 *
1486 * struct LOOKUP3resok {
1487 * nfs_fh3 object;
1488 * post_op_attr obj_attributes;
1489 * post_op_attr dir_attributes;
1490 * };
1491 *
1492 * struct LOOKUP3resfail {
1493 * post_op_attr dir_attributes;
1494 * };
1495 *
1496 * union LOOKUP3res switch (nfsstat3 status) {
1497 * case NFS3_OK:
1498 * LOOKUP3resok resok;
1499 * default:
1500 * LOOKUP3resfail resfail;
1501 * };
1502 */
1503 static int nfs3_xdr_dec_lookup3res(struct rpc_rqst *req,
1504 struct xdr_stream *xdr,
1505 void *data)
1506 {
1507 struct nfs3_diropres *result = data;
1508 enum nfs_stat status;
1509 int error;
1510
1511 error = decode_nfsstat3(xdr, &status);
1512 if (unlikely(error))
1513 goto out;
1514 if (status != NFS3_OK)
1515 goto out_default;
1516 error = decode_nfs_fh3(xdr, result->fh);
1517 if (unlikely(error))
1518 goto out;
1519 error = decode_post_op_attr(xdr, result->fattr);
1520 if (unlikely(error))
1521 goto out;
1522 error = decode_post_op_attr(xdr, result->dir_attr);
1523 out:
1524 return error;
1525 out_default:
1526 error = decode_post_op_attr(xdr, result->dir_attr);
1527 if (unlikely(error))
1528 goto out;
1529 return nfs3_stat_to_errno(status);
1530 }
1531
1532 /*
1533 * 3.3.4 ACCESS3res
1534 *
1535 * struct ACCESS3resok {
1536 * post_op_attr obj_attributes;
1537 * uint32 access;
1538 * };
1539 *
1540 * struct ACCESS3resfail {
1541 * post_op_attr obj_attributes;
1542 * };
1543 *
1544 * union ACCESS3res switch (nfsstat3 status) {
1545 * case NFS3_OK:
1546 * ACCESS3resok resok;
1547 * default:
1548 * ACCESS3resfail resfail;
1549 * };
1550 */
1551 static int nfs3_xdr_dec_access3res(struct rpc_rqst *req,
1552 struct xdr_stream *xdr,
1553 void *data)
1554 {
1555 struct nfs3_accessres *result = data;
1556 enum nfs_stat status;
1557 int error;
1558
1559 error = decode_nfsstat3(xdr, &status);
1560 if (unlikely(error))
1561 goto out;
1562 error = decode_post_op_attr(xdr, result->fattr);
1563 if (unlikely(error))
1564 goto out;
1565 if (status != NFS3_OK)
1566 goto out_default;
1567 error = decode_uint32(xdr, &result->access);
1568 out:
1569 return error;
1570 out_default:
1571 return nfs3_stat_to_errno(status);
1572 }
1573
1574 /*
1575 * 3.3.5 READLINK3res
1576 *
1577 * struct READLINK3resok {
1578 * post_op_attr symlink_attributes;
1579 * nfspath3 data;
1580 * };
1581 *
1582 * struct READLINK3resfail {
1583 * post_op_attr symlink_attributes;
1584 * };
1585 *
1586 * union READLINK3res switch (nfsstat3 status) {
1587 * case NFS3_OK:
1588 * READLINK3resok resok;
1589 * default:
1590 * READLINK3resfail resfail;
1591 * };
1592 */
1593 static int nfs3_xdr_dec_readlink3res(struct rpc_rqst *req,
1594 struct xdr_stream *xdr,
1595 void *result)
1596 {
1597 enum nfs_stat status;
1598 int error;
1599
1600 error = decode_nfsstat3(xdr, &status);
1601 if (unlikely(error))
1602 goto out;
1603 error = decode_post_op_attr(xdr, result);
1604 if (unlikely(error))
1605 goto out;
1606 if (status != NFS3_OK)
1607 goto out_default;
1608 error = decode_nfspath3(xdr);
1609 out:
1610 return error;
1611 out_default:
1612 return nfs3_stat_to_errno(status);
1613 }
1614
1615 /*
1616 * 3.3.6 READ3res
1617 *
1618 * struct READ3resok {
1619 * post_op_attr file_attributes;
1620 * count3 count;
1621 * bool eof;
1622 * opaque data<>;
1623 * };
1624 *
1625 * struct READ3resfail {
1626 * post_op_attr file_attributes;
1627 * };
1628 *
1629 * union READ3res switch (nfsstat3 status) {
1630 * case NFS3_OK:
1631 * READ3resok resok;
1632 * default:
1633 * READ3resfail resfail;
1634 * };
1635 */
1636 static int decode_read3resok(struct xdr_stream *xdr,
1637 struct nfs_pgio_res *result)
1638 {
1639 u32 eof, count, ocount, recvd;
1640 __be32 *p;
1641
1642 p = xdr_inline_decode(xdr, 4 + 4 + 4);
1643 if (unlikely(p == NULL))
1644 goto out_overflow;
1645 count = be32_to_cpup(p++);
1646 eof = be32_to_cpup(p++);
1647 ocount = be32_to_cpup(p++);
1648 if (unlikely(ocount != count))
1649 goto out_mismatch;
1650 recvd = xdr_read_pages(xdr, count);
1651 if (unlikely(count > recvd))
1652 goto out_cheating;
1653 out:
1654 result->eof = eof;
1655 result->count = count;
1656 return count;
1657 out_mismatch:
1658 dprintk("NFS: READ count doesn't match length of opaque: "
1659 "count %u != ocount %u\n", count, ocount);
1660 return -EIO;
1661 out_cheating:
1662 dprintk("NFS: server cheating in read result: "
1663 "count %u > recvd %u\n", count, recvd);
1664 count = recvd;
1665 eof = 0;
1666 goto out;
1667 out_overflow:
1668 print_overflow_msg(__func__, xdr);
1669 return -EIO;
1670 }
1671
1672 static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1673 void *data)
1674 {
1675 struct nfs_pgio_res *result = data;
1676 enum nfs_stat status;
1677 int error;
1678
1679 error = decode_nfsstat3(xdr, &status);
1680 if (unlikely(error))
1681 goto out;
1682 error = decode_post_op_attr(xdr, result->fattr);
1683 if (unlikely(error))
1684 goto out;
1685 result->op_status = status;
1686 if (status != NFS3_OK)
1687 goto out_status;
1688 error = decode_read3resok(xdr, result);
1689 out:
1690 return error;
1691 out_status:
1692 return nfs3_stat_to_errno(status);
1693 }
1694
1695 /*
1696 * 3.3.7 WRITE3res
1697 *
1698 * enum stable_how {
1699 * UNSTABLE = 0,
1700 * DATA_SYNC = 1,
1701 * FILE_SYNC = 2
1702 * };
1703 *
1704 * struct WRITE3resok {
1705 * wcc_data file_wcc;
1706 * count3 count;
1707 * stable_how committed;
1708 * writeverf3 verf;
1709 * };
1710 *
1711 * struct WRITE3resfail {
1712 * wcc_data file_wcc;
1713 * };
1714 *
1715 * union WRITE3res switch (nfsstat3 status) {
1716 * case NFS3_OK:
1717 * WRITE3resok resok;
1718 * default:
1719 * WRITE3resfail resfail;
1720 * };
1721 */
1722 static int decode_write3resok(struct xdr_stream *xdr,
1723 struct nfs_pgio_res *result)
1724 {
1725 __be32 *p;
1726
1727 p = xdr_inline_decode(xdr, 4 + 4);
1728 if (unlikely(p == NULL))
1729 goto out_overflow;
1730 result->count = be32_to_cpup(p++);
1731 result->verf->committed = be32_to_cpup(p++);
1732 if (unlikely(result->verf->committed > NFS_FILE_SYNC))
1733 goto out_badvalue;
1734 if (decode_writeverf3(xdr, &result->verf->verifier))
1735 goto out_eio;
1736 return result->count;
1737 out_badvalue:
1738 dprintk("NFS: bad stable_how value: %u\n", result->verf->committed);
1739 return -EIO;
1740 out_overflow:
1741 print_overflow_msg(__func__, xdr);
1742 out_eio:
1743 return -EIO;
1744 }
1745
1746 static int nfs3_xdr_dec_write3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1747 void *data)
1748 {
1749 struct nfs_pgio_res *result = data;
1750 enum nfs_stat status;
1751 int error;
1752
1753 error = decode_nfsstat3(xdr, &status);
1754 if (unlikely(error))
1755 goto out;
1756 error = decode_wcc_data(xdr, result->fattr);
1757 if (unlikely(error))
1758 goto out;
1759 result->op_status = status;
1760 if (status != NFS3_OK)
1761 goto out_status;
1762 error = decode_write3resok(xdr, result);
1763 out:
1764 return error;
1765 out_status:
1766 return nfs3_stat_to_errno(status);
1767 }
1768
1769 /*
1770 * 3.3.8 CREATE3res
1771 *
1772 * struct CREATE3resok {
1773 * post_op_fh3 obj;
1774 * post_op_attr obj_attributes;
1775 * wcc_data dir_wcc;
1776 * };
1777 *
1778 * struct CREATE3resfail {
1779 * wcc_data dir_wcc;
1780 * };
1781 *
1782 * union CREATE3res switch (nfsstat3 status) {
1783 * case NFS3_OK:
1784 * CREATE3resok resok;
1785 * default:
1786 * CREATE3resfail resfail;
1787 * };
1788 */
1789 static int decode_create3resok(struct xdr_stream *xdr,
1790 struct nfs3_diropres *result)
1791 {
1792 int error;
1793
1794 error = decode_post_op_fh3(xdr, result->fh);
1795 if (unlikely(error))
1796 goto out;
1797 error = decode_post_op_attr(xdr, result->fattr);
1798 if (unlikely(error))
1799 goto out;
1800 /* The server isn't required to return a file handle.
1801 * If it didn't, force the client to perform a LOOKUP
1802 * to determine the correct file handle and attribute
1803 * values for the new object. */
1804 if (result->fh->size == 0)
1805 result->fattr->valid = 0;
1806 error = decode_wcc_data(xdr, result->dir_attr);
1807 out:
1808 return error;
1809 }
1810
1811 static int nfs3_xdr_dec_create3res(struct rpc_rqst *req,
1812 struct xdr_stream *xdr,
1813 void *data)
1814 {
1815 struct nfs3_diropres *result = data;
1816 enum nfs_stat status;
1817 int error;
1818
1819 error = decode_nfsstat3(xdr, &status);
1820 if (unlikely(error))
1821 goto out;
1822 if (status != NFS3_OK)
1823 goto out_default;
1824 error = decode_create3resok(xdr, result);
1825 out:
1826 return error;
1827 out_default:
1828 error = decode_wcc_data(xdr, result->dir_attr);
1829 if (unlikely(error))
1830 goto out;
1831 return nfs3_stat_to_errno(status);
1832 }
1833
1834 /*
1835 * 3.3.12 REMOVE3res
1836 *
1837 * struct REMOVE3resok {
1838 * wcc_data dir_wcc;
1839 * };
1840 *
1841 * struct REMOVE3resfail {
1842 * wcc_data dir_wcc;
1843 * };
1844 *
1845 * union REMOVE3res switch (nfsstat3 status) {
1846 * case NFS3_OK:
1847 * REMOVE3resok resok;
1848 * default:
1849 * REMOVE3resfail resfail;
1850 * };
1851 */
1852 static int nfs3_xdr_dec_remove3res(struct rpc_rqst *req,
1853 struct xdr_stream *xdr,
1854 void *data)
1855 {
1856 struct nfs_removeres *result = data;
1857 enum nfs_stat status;
1858 int error;
1859
1860 error = decode_nfsstat3(xdr, &status);
1861 if (unlikely(error))
1862 goto out;
1863 error = decode_wcc_data(xdr, result->dir_attr);
1864 if (unlikely(error))
1865 goto out;
1866 if (status != NFS3_OK)
1867 goto out_status;
1868 out:
1869 return error;
1870 out_status:
1871 return nfs3_stat_to_errno(status);
1872 }
1873
1874 /*
1875 * 3.3.14 RENAME3res
1876 *
1877 * struct RENAME3resok {
1878 * wcc_data fromdir_wcc;
1879 * wcc_data todir_wcc;
1880 * };
1881 *
1882 * struct RENAME3resfail {
1883 * wcc_data fromdir_wcc;
1884 * wcc_data todir_wcc;
1885 * };
1886 *
1887 * union RENAME3res switch (nfsstat3 status) {
1888 * case NFS3_OK:
1889 * RENAME3resok resok;
1890 * default:
1891 * RENAME3resfail resfail;
1892 * };
1893 */
1894 static int nfs3_xdr_dec_rename3res(struct rpc_rqst *req,
1895 struct xdr_stream *xdr,
1896 void *data)
1897 {
1898 struct nfs_renameres *result = data;
1899 enum nfs_stat status;
1900 int error;
1901
1902 error = decode_nfsstat3(xdr, &status);
1903 if (unlikely(error))
1904 goto out;
1905 error = decode_wcc_data(xdr, result->old_fattr);
1906 if (unlikely(error))
1907 goto out;
1908 error = decode_wcc_data(xdr, result->new_fattr);
1909 if (unlikely(error))
1910 goto out;
1911 if (status != NFS3_OK)
1912 goto out_status;
1913 out:
1914 return error;
1915 out_status:
1916 return nfs3_stat_to_errno(status);
1917 }
1918
1919 /*
1920 * 3.3.15 LINK3res
1921 *
1922 * struct LINK3resok {
1923 * post_op_attr file_attributes;
1924 * wcc_data linkdir_wcc;
1925 * };
1926 *
1927 * struct LINK3resfail {
1928 * post_op_attr file_attributes;
1929 * wcc_data linkdir_wcc;
1930 * };
1931 *
1932 * union LINK3res switch (nfsstat3 status) {
1933 * case NFS3_OK:
1934 * LINK3resok resok;
1935 * default:
1936 * LINK3resfail resfail;
1937 * };
1938 */
1939 static int nfs3_xdr_dec_link3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1940 void *data)
1941 {
1942 struct nfs3_linkres *result = data;
1943 enum nfs_stat status;
1944 int error;
1945
1946 error = decode_nfsstat3(xdr, &status);
1947 if (unlikely(error))
1948 goto out;
1949 error = decode_post_op_attr(xdr, result->fattr);
1950 if (unlikely(error))
1951 goto out;
1952 error = decode_wcc_data(xdr, result->dir_attr);
1953 if (unlikely(error))
1954 goto out;
1955 if (status != NFS3_OK)
1956 goto out_status;
1957 out:
1958 return error;
1959 out_status:
1960 return nfs3_stat_to_errno(status);
1961 }
1962
1963 /**
1964 * nfs3_decode_dirent - Decode a single NFSv3 directory entry stored in
1965 * the local page cache
1966 * @xdr: XDR stream where entry resides
1967 * @entry: buffer to fill in with entry data
1968 * @plus: boolean indicating whether this should be a readdirplus entry
1969 *
1970 * Returns zero if successful, otherwise a negative errno value is
1971 * returned.
1972 *
1973 * This function is not invoked during READDIR reply decoding, but
1974 * rather whenever an application invokes the getdents(2) system call
1975 * on a directory already in our cache.
1976 *
1977 * 3.3.16 entry3
1978 *
1979 * struct entry3 {
1980 * fileid3 fileid;
1981 * filename3 name;
1982 * cookie3 cookie;
1983 * fhandle3 filehandle;
1984 * post_op_attr3 attributes;
1985 * entry3 *nextentry;
1986 * };
1987 *
1988 * 3.3.17 entryplus3
1989 * struct entryplus3 {
1990 * fileid3 fileid;
1991 * filename3 name;
1992 * cookie3 cookie;
1993 * post_op_attr name_attributes;
1994 * post_op_fh3 name_handle;
1995 * entryplus3 *nextentry;
1996 * };
1997 */
1998 int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
1999 bool plus)
2000 {
2001 struct nfs_entry old = *entry;
2002 __be32 *p;
2003 int error;
2004 u64 new_cookie;
2005
2006 p = xdr_inline_decode(xdr, 4);
2007 if (unlikely(p == NULL))
2008 goto out_overflow;
2009 if (*p == xdr_zero) {
2010 p = xdr_inline_decode(xdr, 4);
2011 if (unlikely(p == NULL))
2012 goto out_overflow;
2013 if (*p == xdr_zero)
2014 return -EAGAIN;
2015 entry->eof = 1;
2016 return -EBADCOOKIE;
2017 }
2018
2019 error = decode_fileid3(xdr, &entry->ino);
2020 if (unlikely(error))
2021 return error;
2022
2023 error = decode_inline_filename3(xdr, &entry->name, &entry->len);
2024 if (unlikely(error))
2025 return error;
2026
2027 error = decode_cookie3(xdr, &new_cookie);
2028 if (unlikely(error))
2029 return error;
2030
2031 entry->d_type = DT_UNKNOWN;
2032
2033 if (plus) {
2034 entry->fattr->valid = 0;
2035 error = decode_post_op_attr(xdr, entry->fattr);
2036 if (unlikely(error))
2037 return error;
2038 if (entry->fattr->valid & NFS_ATTR_FATTR_V3)
2039 entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);
2040
2041 if (entry->fattr->fileid != entry->ino) {
2042 entry->fattr->mounted_on_fileid = entry->ino;
2043 entry->fattr->valid |= NFS_ATTR_FATTR_MOUNTED_ON_FILEID;
2044 }
2045
2046 /* In fact, a post_op_fh3: */
2047 p = xdr_inline_decode(xdr, 4);
2048 if (unlikely(p == NULL))
2049 goto out_overflow;
2050 if (*p != xdr_zero) {
2051 error = decode_nfs_fh3(xdr, entry->fh);
2052 if (unlikely(error)) {
2053 if (error == -E2BIG)
2054 goto out_truncated;
2055 return error;
2056 }
2057 } else
2058 zero_nfs_fh3(entry->fh);
2059 }
2060
2061 entry->prev_cookie = entry->cookie;
2062 entry->cookie = new_cookie;
2063
2064 return 0;
2065
2066 out_overflow:
2067 print_overflow_msg(__func__, xdr);
2068 return -EAGAIN;
2069 out_truncated:
2070 dprintk("NFS: directory entry contains invalid file handle\n");
2071 *entry = old;
2072 return -EAGAIN;
2073 }
2074
2075 /*
2076 * 3.3.16 READDIR3res
2077 *
2078 * struct dirlist3 {
2079 * entry3 *entries;
2080 * bool eof;
2081 * };
2082 *
2083 * struct READDIR3resok {
2084 * post_op_attr dir_attributes;
2085 * cookieverf3 cookieverf;
2086 * dirlist3 reply;
2087 * };
2088 *
2089 * struct READDIR3resfail {
2090 * post_op_attr dir_attributes;
2091 * };
2092 *
2093 * union READDIR3res switch (nfsstat3 status) {
2094 * case NFS3_OK:
2095 * READDIR3resok resok;
2096 * default:
2097 * READDIR3resfail resfail;
2098 * };
2099 *
2100 * Read the directory contents into the page cache, but otherwise
2101 * don't touch them. The actual decoding is done by nfs3_decode_entry()
2102 * during subsequent nfs_readdir() calls.
2103 */
2104 static int decode_dirlist3(struct xdr_stream *xdr)
2105 {
2106 return xdr_read_pages(xdr, xdr->buf->page_len);
2107 }
2108
2109 static int decode_readdir3resok(struct xdr_stream *xdr,
2110 struct nfs3_readdirres *result)
2111 {
2112 int error;
2113
2114 error = decode_post_op_attr(xdr, result->dir_attr);
2115 if (unlikely(error))
2116 goto out;
2117 /* XXX: do we need to check if result->verf != NULL ? */
2118 error = decode_cookieverf3(xdr, result->verf);
2119 if (unlikely(error))
2120 goto out;
2121 error = decode_dirlist3(xdr);
2122 out:
2123 return error;
2124 }
2125
2126 static int nfs3_xdr_dec_readdir3res(struct rpc_rqst *req,
2127 struct xdr_stream *xdr,
2128 void *data)
2129 {
2130 struct nfs3_readdirres *result = data;
2131 enum nfs_stat status;
2132 int error;
2133
2134 error = decode_nfsstat3(xdr, &status);
2135 if (unlikely(error))
2136 goto out;
2137 if (status != NFS3_OK)
2138 goto out_default;
2139 error = decode_readdir3resok(xdr, result);
2140 out:
2141 return error;
2142 out_default:
2143 error = decode_post_op_attr(xdr, result->dir_attr);
2144 if (unlikely(error))
2145 goto out;
2146 return nfs3_stat_to_errno(status);
2147 }
2148
2149 /*
2150 * 3.3.18 FSSTAT3res
2151 *
2152 * struct FSSTAT3resok {
2153 * post_op_attr obj_attributes;
2154 * size3 tbytes;
2155 * size3 fbytes;
2156 * size3 abytes;
2157 * size3 tfiles;
2158 * size3 ffiles;
2159 * size3 afiles;
2160 * uint32 invarsec;
2161 * };
2162 *
2163 * struct FSSTAT3resfail {
2164 * post_op_attr obj_attributes;
2165 * };
2166 *
2167 * union FSSTAT3res switch (nfsstat3 status) {
2168 * case NFS3_OK:
2169 * FSSTAT3resok resok;
2170 * default:
2171 * FSSTAT3resfail resfail;
2172 * };
2173 */
2174 static int decode_fsstat3resok(struct xdr_stream *xdr,
2175 struct nfs_fsstat *result)
2176 {
2177 __be32 *p;
2178
2179 p = xdr_inline_decode(xdr, 8 * 6 + 4);
2180 if (unlikely(p == NULL))
2181 goto out_overflow;
2182 p = xdr_decode_size3(p, &result->tbytes);
2183 p = xdr_decode_size3(p, &result->fbytes);
2184 p = xdr_decode_size3(p, &result->abytes);
2185 p = xdr_decode_size3(p, &result->tfiles);
2186 p = xdr_decode_size3(p, &result->ffiles);
2187 xdr_decode_size3(p, &result->afiles);
2188 /* ignore invarsec */
2189 return 0;
2190 out_overflow:
2191 print_overflow_msg(__func__, xdr);
2192 return -EIO;
2193 }
2194
2195 static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req,
2196 struct xdr_stream *xdr,
2197 void *data)
2198 {
2199 struct nfs_fsstat *result = data;
2200 enum nfs_stat status;
2201 int error;
2202
2203 error = decode_nfsstat3(xdr, &status);
2204 if (unlikely(error))
2205 goto out;
2206 error = decode_post_op_attr(xdr, result->fattr);
2207 if (unlikely(error))
2208 goto out;
2209 if (status != NFS3_OK)
2210 goto out_status;
2211 error = decode_fsstat3resok(xdr, result);
2212 out:
2213 return error;
2214 out_status:
2215 return nfs3_stat_to_errno(status);
2216 }
2217
2218 /*
2219 * 3.3.19 FSINFO3res
2220 *
2221 * struct FSINFO3resok {
2222 * post_op_attr obj_attributes;
2223 * uint32 rtmax;
2224 * uint32 rtpref;
2225 * uint32 rtmult;
2226 * uint32 wtmax;
2227 * uint32 wtpref;
2228 * uint32 wtmult;
2229 * uint32 dtpref;
2230 * size3 maxfilesize;
2231 * nfstime3 time_delta;
2232 * uint32 properties;
2233 * };
2234 *
2235 * struct FSINFO3resfail {
2236 * post_op_attr obj_attributes;
2237 * };
2238 *
2239 * union FSINFO3res switch (nfsstat3 status) {
2240 * case NFS3_OK:
2241 * FSINFO3resok resok;
2242 * default:
2243 * FSINFO3resfail resfail;
2244 * };
2245 */
2246 static int decode_fsinfo3resok(struct xdr_stream *xdr,
2247 struct nfs_fsinfo *result)
2248 {
2249 __be32 *p;
2250
2251 p = xdr_inline_decode(xdr, 4 * 7 + 8 + 8 + 4);
2252 if (unlikely(p == NULL))
2253 goto out_overflow;
2254 result->rtmax = be32_to_cpup(p++);
2255 result->rtpref = be32_to_cpup(p++);
2256 result->rtmult = be32_to_cpup(p++);
2257 result->wtmax = be32_to_cpup(p++);
2258 result->wtpref = be32_to_cpup(p++);
2259 result->wtmult = be32_to_cpup(p++);
2260 result->dtpref = be32_to_cpup(p++);
2261 p = xdr_decode_size3(p, &result->maxfilesize);
2262 xdr_decode_nfstime3(p, &result->time_delta);
2263
2264 /* ignore properties */
2265 result->lease_time = 0;
2266 return 0;
2267 out_overflow:
2268 print_overflow_msg(__func__, xdr);
2269 return -EIO;
2270 }
2271
2272 static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req,
2273 struct xdr_stream *xdr,
2274 void *data)
2275 {
2276 struct nfs_fsinfo *result = data;
2277 enum nfs_stat status;
2278 int error;
2279
2280 error = decode_nfsstat3(xdr, &status);
2281 if (unlikely(error))
2282 goto out;
2283 error = decode_post_op_attr(xdr, result->fattr);
2284 if (unlikely(error))
2285 goto out;
2286 if (status != NFS3_OK)
2287 goto out_status;
2288 error = decode_fsinfo3resok(xdr, result);
2289 out:
2290 return error;
2291 out_status:
2292 return nfs3_stat_to_errno(status);
2293 }
2294
2295 /*
2296 * 3.3.20 PATHCONF3res
2297 *
2298 * struct PATHCONF3resok {
2299 * post_op_attr obj_attributes;
2300 * uint32 linkmax;
2301 * uint32 name_max;
2302 * bool no_trunc;
2303 * bool chown_restricted;
2304 * bool case_insensitive;
2305 * bool case_preserving;
2306 * };
2307 *
2308 * struct PATHCONF3resfail {
2309 * post_op_attr obj_attributes;
2310 * };
2311 *
2312 * union PATHCONF3res switch (nfsstat3 status) {
2313 * case NFS3_OK:
2314 * PATHCONF3resok resok;
2315 * default:
2316 * PATHCONF3resfail resfail;
2317 * };
2318 */
2319 static int decode_pathconf3resok(struct xdr_stream *xdr,
2320 struct nfs_pathconf *result)
2321 {
2322 __be32 *p;
2323
2324 p = xdr_inline_decode(xdr, 4 * 6);
2325 if (unlikely(p == NULL))
2326 goto out_overflow;
2327 result->max_link = be32_to_cpup(p++);
2328 result->max_namelen = be32_to_cpup(p);
2329 /* ignore remaining fields */
2330 return 0;
2331 out_overflow:
2332 print_overflow_msg(__func__, xdr);
2333 return -EIO;
2334 }
2335
2336 static int nfs3_xdr_dec_pathconf3res(struct rpc_rqst *req,
2337 struct xdr_stream *xdr,
2338 void *data)
2339 {
2340 struct nfs_pathconf *result = data;
2341 enum nfs_stat status;
2342 int error;
2343
2344 error = decode_nfsstat3(xdr, &status);
2345 if (unlikely(error))
2346 goto out;
2347 error = decode_post_op_attr(xdr, result->fattr);
2348 if (unlikely(error))
2349 goto out;
2350 if (status != NFS3_OK)
2351 goto out_status;
2352 error = decode_pathconf3resok(xdr, result);
2353 out:
2354 return error;
2355 out_status:
2356 return nfs3_stat_to_errno(status);
2357 }
2358
2359 /*
2360 * 3.3.21 COMMIT3res
2361 *
2362 * struct COMMIT3resok {
2363 * wcc_data file_wcc;
2364 * writeverf3 verf;
2365 * };
2366 *
2367 * struct COMMIT3resfail {
2368 * wcc_data file_wcc;
2369 * };
2370 *
2371 * union COMMIT3res switch (nfsstat3 status) {
2372 * case NFS3_OK:
2373 * COMMIT3resok resok;
2374 * default:
2375 * COMMIT3resfail resfail;
2376 * };
2377 */
2378 static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req,
2379 struct xdr_stream *xdr,
2380 void *data)
2381 {
2382 struct nfs_commitres *result = data;
2383 enum nfs_stat status;
2384 int error;
2385
2386 error = decode_nfsstat3(xdr, &status);
2387 if (unlikely(error))
2388 goto out;
2389 error = decode_wcc_data(xdr, result->fattr);
2390 if (unlikely(error))
2391 goto out;
2392 result->op_status = status;
2393 if (status != NFS3_OK)
2394 goto out_status;
2395 error = decode_writeverf3(xdr, &result->verf->verifier);
2396 out:
2397 return error;
2398 out_status:
2399 return nfs3_stat_to_errno(status);
2400 }
2401
2402 #ifdef CONFIG_NFS_V3_ACL
2403
2404 static inline int decode_getacl3resok(struct xdr_stream *xdr,
2405 struct nfs3_getaclres *result)
2406 {
2407 struct posix_acl **acl;
2408 unsigned int *aclcnt;
2409 size_t hdrlen;
2410 int error;
2411
2412 error = decode_post_op_attr(xdr, result->fattr);
2413 if (unlikely(error))
2414 goto out;
2415 error = decode_uint32(xdr, &result->mask);
2416 if (unlikely(error))
2417 goto out;
2418 error = -EINVAL;
2419 if (result->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
2420 goto out;
2421
2422 hdrlen = xdr_stream_pos(xdr);
2423
2424 acl = NULL;
2425 if (result->mask & NFS_ACL)
2426 acl = &result->acl_access;
2427 aclcnt = NULL;
2428 if (result->mask & NFS_ACLCNT)
2429 aclcnt = &result->acl_access_count;
2430 error = nfsacl_decode(xdr->buf, hdrlen, aclcnt, acl);
2431 if (unlikely(error <= 0))
2432 goto out;
2433
2434 acl = NULL;
2435 if (result->mask & NFS_DFACL)
2436 acl = &result->acl_default;
2437 aclcnt = NULL;
2438 if (result->mask & NFS_DFACLCNT)
2439 aclcnt = &result->acl_default_count;
2440 error = nfsacl_decode(xdr->buf, hdrlen + error, aclcnt, acl);
2441 if (unlikely(error <= 0))
2442 return error;
2443 error = 0;
2444 out:
2445 return error;
2446 }
2447
2448 static int nfs3_xdr_dec_getacl3res(struct rpc_rqst *req,
2449 struct xdr_stream *xdr,
2450 void *result)
2451 {
2452 enum nfs_stat status;
2453 int error;
2454
2455 error = decode_nfsstat3(xdr, &status);
2456 if (unlikely(error))
2457 goto out;
2458 if (status != NFS3_OK)
2459 goto out_default;
2460 error = decode_getacl3resok(xdr, result);
2461 out:
2462 return error;
2463 out_default:
2464 return nfs3_stat_to_errno(status);
2465 }
2466
2467 static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req,
2468 struct xdr_stream *xdr,
2469 void *result)
2470 {
2471 enum nfs_stat status;
2472 int error;
2473
2474 error = decode_nfsstat3(xdr, &status);
2475 if (unlikely(error))
2476 goto out;
2477 if (status != NFS3_OK)
2478 goto out_default;
2479 error = decode_post_op_attr(xdr, result);
2480 out:
2481 return error;
2482 out_default:
2483 return nfs3_stat_to_errno(status);
2484 }
2485
2486 #endif /* CONFIG_NFS_V3_ACL */
2487
2488
2489 /*
2490 * We need to translate between nfs status return values and
2491 * the local errno values which may not be the same.
2492 */
2493 static const struct {
2494 int stat;
2495 int errno;
2496 } nfs_errtbl[] = {
2497 { NFS_OK, 0 },
2498 { NFSERR_PERM, -EPERM },
2499 { NFSERR_NOENT, -ENOENT },
2500 { NFSERR_IO, -errno_NFSERR_IO},
2501 { NFSERR_NXIO, -ENXIO },
2502 /* { NFSERR_EAGAIN, -EAGAIN }, */
2503 { NFSERR_ACCES, -EACCES },
2504 { NFSERR_EXIST, -EEXIST },
2505 { NFSERR_XDEV, -EXDEV },
2506 { NFSERR_NODEV, -ENODEV },
2507 { NFSERR_NOTDIR, -ENOTDIR },
2508 { NFSERR_ISDIR, -EISDIR },
2509 { NFSERR_INVAL, -EINVAL },
2510 { NFSERR_FBIG, -EFBIG },
2511 { NFSERR_NOSPC, -ENOSPC },
2512 { NFSERR_ROFS, -EROFS },
2513 { NFSERR_MLINK, -EMLINK },
2514 { NFSERR_NAMETOOLONG, -ENAMETOOLONG },
2515 { NFSERR_NOTEMPTY, -ENOTEMPTY },
2516 { NFSERR_DQUOT, -EDQUOT },
2517 { NFSERR_STALE, -ESTALE },
2518 { NFSERR_REMOTE, -EREMOTE },
2519 #ifdef EWFLUSH
2520 { NFSERR_WFLUSH, -EWFLUSH },
2521 #endif
2522 { NFSERR_BADHANDLE, -EBADHANDLE },
2523 { NFSERR_NOT_SYNC, -ENOTSYNC },
2524 { NFSERR_BAD_COOKIE, -EBADCOOKIE },
2525 { NFSERR_NOTSUPP, -ENOTSUPP },
2526 { NFSERR_TOOSMALL, -ETOOSMALL },
2527 { NFSERR_SERVERFAULT, -EREMOTEIO },
2528 { NFSERR_BADTYPE, -EBADTYPE },
2529 { NFSERR_JUKEBOX, -EJUKEBOX },
2530 { -1, -EIO }
2531 };
2532
2533 /**
2534 * nfs3_stat_to_errno - convert an NFS status code to a local errno
2535 * @status: NFS status code to convert
2536 *
2537 * Returns a local errno value, or -EIO if the NFS status code is
2538 * not recognized. This function is used jointly by NFSv2 and NFSv3.
2539 */
2540 static int nfs3_stat_to_errno(enum nfs_stat status)
2541 {
2542 int i;
2543
2544 for (i = 0; nfs_errtbl[i].stat != -1; i++) {
2545 if (nfs_errtbl[i].stat == (int)status)
2546 return nfs_errtbl[i].errno;
2547 }
2548 dprintk("NFS: Unrecognized nfs status value: %u\n", status);
2549 return nfs_errtbl[i].errno;
2550 }
2551
2552
2553 #define PROC(proc, argtype, restype, timer) \
2554 [NFS3PROC_##proc] = { \
2555 .p_proc = NFS3PROC_##proc, \
2556 .p_encode = nfs3_xdr_enc_##argtype##3args, \
2557 .p_decode = nfs3_xdr_dec_##restype##3res, \
2558 .p_arglen = NFS3_##argtype##args_sz, \
2559 .p_replen = NFS3_##restype##res_sz, \
2560 .p_timer = timer, \
2561 .p_statidx = NFS3PROC_##proc, \
2562 .p_name = #proc, \
2563 }
2564
2565 const struct rpc_procinfo nfs3_procedures[] = {
2566 PROC(GETATTR, getattr, getattr, 1),
2567 PROC(SETATTR, setattr, setattr, 0),
2568 PROC(LOOKUP, lookup, lookup, 2),
2569 PROC(ACCESS, access, access, 1),
2570 PROC(READLINK, readlink, readlink, 3),
2571 PROC(READ, read, read, 3),
2572 PROC(WRITE, write, write, 4),
2573 PROC(CREATE, create, create, 0),
2574 PROC(MKDIR, mkdir, create, 0),
2575 PROC(SYMLINK, symlink, create, 0),
2576 PROC(MKNOD, mknod, create, 0),
2577 PROC(REMOVE, remove, remove, 0),
2578 PROC(RMDIR, lookup, setattr, 0),
2579 PROC(RENAME, rename, rename, 0),
2580 PROC(LINK, link, link, 0),
2581 PROC(READDIR, readdir, readdir, 3),
2582 PROC(READDIRPLUS, readdirplus, readdir, 3),
2583 PROC(FSSTAT, getattr, fsstat, 0),
2584 PROC(FSINFO, getattr, fsinfo, 0),
2585 PROC(PATHCONF, getattr, pathconf, 0),
2586 PROC(COMMIT, commit, commit, 5),
2587 };
2588
2589 static unsigned int nfs_version3_counts[ARRAY_SIZE(nfs3_procedures)];
2590 const struct rpc_version nfs_version3 = {
2591 .number = 3,
2592 .nrprocs = ARRAY_SIZE(nfs3_procedures),
2593 .procs = nfs3_procedures,
2594 .counts = nfs_version3_counts,
2595 };
2596
2597 #ifdef CONFIG_NFS_V3_ACL
2598 static const struct rpc_procinfo nfs3_acl_procedures[] = {
2599 [ACLPROC3_GETACL] = {
2600 .p_proc = ACLPROC3_GETACL,
2601 .p_encode = nfs3_xdr_enc_getacl3args,
2602 .p_decode = nfs3_xdr_dec_getacl3res,
2603 .p_arglen = ACL3_getaclargs_sz,
2604 .p_replen = ACL3_getaclres_sz,
2605 .p_timer = 1,
2606 .p_name = "GETACL",
2607 },
2608 [ACLPROC3_SETACL] = {
2609 .p_proc = ACLPROC3_SETACL,
2610 .p_encode = nfs3_xdr_enc_setacl3args,
2611 .p_decode = nfs3_xdr_dec_setacl3res,
2612 .p_arglen = ACL3_setaclargs_sz,
2613 .p_replen = ACL3_setaclres_sz,
2614 .p_timer = 0,
2615 .p_name = "SETACL",
2616 },
2617 };
2618
2619 static unsigned int nfs3_acl_counts[ARRAY_SIZE(nfs3_acl_procedures)];
2620 const struct rpc_version nfsacl_version3 = {
2621 .number = 3,
2622 .nrprocs = ARRAY_SIZE(nfs3_acl_procedures),
2623 .procs = nfs3_acl_procedures,
2624 .counts = nfs3_acl_counts,
2625 };
2626 #endif /* CONFIG_NFS_V3_ACL */
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