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mm: fix exec activate_mm vs TLB shootdown and lazy tlb switching race
[linux/fpc-iii.git] / fs / nfs / nfs3xdr.c
blobf1cb0b7eb05f90e9abc779094504bdd728327ebd
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 u32 nbytes;
565 __be32 *p;
566
567 /*
568 * In order to make only a single xdr_reserve_space() call,
569 * pre-compute the total number of bytes to be reserved.
570 * Six boolean values, one for each set_foo field, are always
571 * present in the encoded result, so start there.
572 */
573 nbytes = 6 * 4;
574 if (attr->ia_valid & ATTR_MODE)
575 nbytes += 4;
576 if (attr->ia_valid & ATTR_UID)
577 nbytes += 4;
578 if (attr->ia_valid & ATTR_GID)
579 nbytes += 4;
580 if (attr->ia_valid & ATTR_SIZE)
581 nbytes += 8;
582 if (attr->ia_valid & ATTR_ATIME_SET)
583 nbytes += 8;
584 if (attr->ia_valid & ATTR_MTIME_SET)
585 nbytes += 8;
586 p = xdr_reserve_space(xdr, nbytes);
587
588 if (attr->ia_valid & ATTR_MODE) {
589 *p++ = xdr_one;
590 *p++ = cpu_to_be32(attr->ia_mode & S_IALLUGO);
591 } else
592 *p++ = xdr_zero;
593
594 if (attr->ia_valid & ATTR_UID) {
595 *p++ = xdr_one;
596 *p++ = cpu_to_be32(from_kuid(&init_user_ns, attr->ia_uid));
597 } else
598 *p++ = xdr_zero;
599
600 if (attr->ia_valid & ATTR_GID) {
601 *p++ = xdr_one;
602 *p++ = cpu_to_be32(from_kgid(&init_user_ns, attr->ia_gid));
603 } else
604 *p++ = xdr_zero;
605
606 if (attr->ia_valid & ATTR_SIZE) {
607 *p++ = xdr_one;
608 p = xdr_encode_hyper(p, (u64)attr->ia_size);
609 } else
610 *p++ = xdr_zero;
611
612 if (attr->ia_valid & ATTR_ATIME_SET) {
613 *p++ = xdr_two;
614 p = xdr_encode_nfstime3(p, &attr->ia_atime);
615 } else if (attr->ia_valid & ATTR_ATIME) {
616 *p++ = xdr_one;
617 } else
618 *p++ = xdr_zero;
619
620 if (attr->ia_valid & ATTR_MTIME_SET) {
621 *p++ = xdr_two;
622 xdr_encode_nfstime3(p, &attr->ia_mtime);
623 } else if (attr->ia_valid & ATTR_MTIME) {
624 *p = xdr_one;
625 } else
626 *p = xdr_zero;
627 }
628
629 /*
630 * fattr3
631 *
632 * struct fattr3 {
633 * ftype3 type;
634 * mode3 mode;
635 * uint32 nlink;
636 * uid3 uid;
637 * gid3 gid;
638 * size3 size;
639 * size3 used;
640 * specdata3 rdev;
641 * uint64 fsid;
642 * fileid3 fileid;
643 * nfstime3 atime;
644 * nfstime3 mtime;
645 * nfstime3 ctime;
646 * };
647 */
648 static int decode_fattr3(struct xdr_stream *xdr, struct nfs_fattr *fattr)
649 {
650 umode_t fmode;
651 __be32 *p;
652
653 p = xdr_inline_decode(xdr, NFS3_fattr_sz << 2);
654 if (unlikely(p == NULL))
655 goto out_overflow;
656
657 p = xdr_decode_ftype3(p, &fmode);
658
659 fattr->mode = (be32_to_cpup(p++) & ~S_IFMT) | fmode;
660 fattr->nlink = be32_to_cpup(p++);
661 fattr->uid = make_kuid(&init_user_ns, be32_to_cpup(p++));
662 if (!uid_valid(fattr->uid))
663 goto out_uid;
664 fattr->gid = make_kgid(&init_user_ns, be32_to_cpup(p++));
665 if (!gid_valid(fattr->gid))
666 goto out_gid;
667
668 p = xdr_decode_size3(p, &fattr->size);
669 p = xdr_decode_size3(p, &fattr->du.nfs3.used);
670 p = xdr_decode_specdata3(p, &fattr->rdev);
671
672 p = xdr_decode_hyper(p, &fattr->fsid.major);
673 fattr->fsid.minor = 0;
674
675 p = xdr_decode_fileid3(p, &fattr->fileid);
676 p = xdr_decode_nfstime3(p, &fattr->atime);
677 p = xdr_decode_nfstime3(p, &fattr->mtime);
678 xdr_decode_nfstime3(p, &fattr->ctime);
679 fattr->change_attr = nfs_timespec_to_change_attr(&fattr->ctime);
680
681 fattr->valid |= NFS_ATTR_FATTR_V3;
682 return 0;
683 out_uid:
684 dprintk("NFS: returned invalid uid\n");
685 return -EINVAL;
686 out_gid:
687 dprintk("NFS: returned invalid gid\n");
688 return -EINVAL;
689 out_overflow:
690 print_overflow_msg(__func__, xdr);
691 return -EIO;
692 }
693
694 /*
695 * post_op_attr
696 *
697 * union post_op_attr switch (bool attributes_follow) {
698 * case TRUE:
699 * fattr3 attributes;
700 * case FALSE:
701 * void;
702 * };
703 */
704 static int decode_post_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
705 {
706 __be32 *p;
707
708 p = xdr_inline_decode(xdr, 4);
709 if (unlikely(p == NULL))
710 goto out_overflow;
711 if (*p != xdr_zero)
712 return decode_fattr3(xdr, fattr);
713 return 0;
714 out_overflow:
715 print_overflow_msg(__func__, xdr);
716 return -EIO;
717 }
718
719 /*
720 * wcc_attr
721 * struct wcc_attr {
722 * size3 size;
723 * nfstime3 mtime;
724 * nfstime3 ctime;
725 * };
726 */
727 static int decode_wcc_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
728 {
729 __be32 *p;
730
731 p = xdr_inline_decode(xdr, NFS3_wcc_attr_sz << 2);
732 if (unlikely(p == NULL))
733 goto out_overflow;
734
735 fattr->valid |= NFS_ATTR_FATTR_PRESIZE
736 | NFS_ATTR_FATTR_PRECHANGE
737 | NFS_ATTR_FATTR_PREMTIME
738 | NFS_ATTR_FATTR_PRECTIME;
739
740 p = xdr_decode_size3(p, &fattr->pre_size);
741 p = xdr_decode_nfstime3(p, &fattr->pre_mtime);
742 xdr_decode_nfstime3(p, &fattr->pre_ctime);
743 fattr->pre_change_attr = nfs_timespec_to_change_attr(&fattr->pre_ctime);
744
745 return 0;
746 out_overflow:
747 print_overflow_msg(__func__, xdr);
748 return -EIO;
749 }
750
751 /*
752 * pre_op_attr
753 * union pre_op_attr switch (bool attributes_follow) {
754 * case TRUE:
755 * wcc_attr attributes;
756 * case FALSE:
757 * void;
758 * };
759 *
760 * wcc_data
761 *
762 * struct wcc_data {
763 * pre_op_attr before;
764 * post_op_attr after;
765 * };
766 */
767 static int decode_pre_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
768 {
769 __be32 *p;
770
771 p = xdr_inline_decode(xdr, 4);
772 if (unlikely(p == NULL))
773 goto out_overflow;
774 if (*p != xdr_zero)
775 return decode_wcc_attr(xdr, fattr);
776 return 0;
777 out_overflow:
778 print_overflow_msg(__func__, xdr);
779 return -EIO;
780 }
781
782 static int decode_wcc_data(struct xdr_stream *xdr, struct nfs_fattr *fattr)
783 {
784 int error;
785
786 error = decode_pre_op_attr(xdr, fattr);
787 if (unlikely(error))
788 goto out;
789 error = decode_post_op_attr(xdr, fattr);
790 out:
791 return error;
792 }
793
794 /*
795 * post_op_fh3
796 *
797 * union post_op_fh3 switch (bool handle_follows) {
798 * case TRUE:
799 * nfs_fh3 handle;
800 * case FALSE:
801 * void;
802 * };
803 */
804 static int decode_post_op_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
805 {
806 __be32 *p = xdr_inline_decode(xdr, 4);
807 if (unlikely(p == NULL))
808 goto out_overflow;
809 if (*p != xdr_zero)
810 return decode_nfs_fh3(xdr, fh);
811 zero_nfs_fh3(fh);
812 return 0;
813 out_overflow:
814 print_overflow_msg(__func__, xdr);
815 return -EIO;
816 }
817
818 /*
819 * diropargs3
820 *
821 * struct diropargs3 {
822 * nfs_fh3 dir;
823 * filename3 name;
824 * };
825 */
826 static void encode_diropargs3(struct xdr_stream *xdr, const struct nfs_fh *fh,
827 const char *name, u32 length)
828 {
829 encode_nfs_fh3(xdr, fh);
830 encode_filename3(xdr, name, length);
831 }
832
833
834 /*
835 * NFSv3 XDR encode functions
836 *
837 * NFSv3 argument types are defined in section 3.3 of RFC 1813:
838 * "NFS Version 3 Protocol Specification".
839 */
840
841 /*
842 * 3.3.1 GETATTR3args
843 *
844 * struct GETATTR3args {
845 * nfs_fh3 object;
846 * };
847 */
848 static void nfs3_xdr_enc_getattr3args(struct rpc_rqst *req,
849 struct xdr_stream *xdr,
850 const void *data)
851 {
852 const struct nfs_fh *fh = data;
853
854 encode_nfs_fh3(xdr, fh);
855 }
856
857 /*
858 * 3.3.2 SETATTR3args
859 *
860 * union sattrguard3 switch (bool check) {
861 * case TRUE:
862 * nfstime3 obj_ctime;
863 * case FALSE:
864 * void;
865 * };
866 *
867 * struct SETATTR3args {
868 * nfs_fh3 object;
869 * sattr3 new_attributes;
870 * sattrguard3 guard;
871 * };
872 */
873 static void encode_sattrguard3(struct xdr_stream *xdr,
874 const struct nfs3_sattrargs *args)
875 {
876 __be32 *p;
877
878 if (args->guard) {
879 p = xdr_reserve_space(xdr, 4 + 8);
880 *p++ = xdr_one;
881 xdr_encode_nfstime3(p, &args->guardtime);
882 } else {
883 p = xdr_reserve_space(xdr, 4);
884 *p = xdr_zero;
885 }
886 }
887
888 static void nfs3_xdr_enc_setattr3args(struct rpc_rqst *req,
889 struct xdr_stream *xdr,
890 const void *data)
891 {
892 const struct nfs3_sattrargs *args = data;
893 encode_nfs_fh3(xdr, args->fh);
894 encode_sattr3(xdr, args->sattr);
895 encode_sattrguard3(xdr, args);
896 }
897
898 /*
899 * 3.3.3 LOOKUP3args
900 *
901 * struct LOOKUP3args {
902 * diropargs3 what;
903 * };
904 */
905 static void nfs3_xdr_enc_lookup3args(struct rpc_rqst *req,
906 struct xdr_stream *xdr,
907 const void *data)
908 {
909 const struct nfs3_diropargs *args = data;
910
911 encode_diropargs3(xdr, args->fh, args->name, args->len);
912 }
913
914 /*
915 * 3.3.4 ACCESS3args
916 *
917 * struct ACCESS3args {
918 * nfs_fh3 object;
919 * uint32 access;
920 * };
921 */
922 static void encode_access3args(struct xdr_stream *xdr,
923 const struct nfs3_accessargs *args)
924 {
925 encode_nfs_fh3(xdr, args->fh);
926 encode_uint32(xdr, args->access);
927 }
928
929 static void nfs3_xdr_enc_access3args(struct rpc_rqst *req,
930 struct xdr_stream *xdr,
931 const void *data)
932 {
933 const struct nfs3_accessargs *args = data;
934
935 encode_access3args(xdr, args);
936 }
937
938 /*
939 * 3.3.5 READLINK3args
940 *
941 * struct READLINK3args {
942 * nfs_fh3 symlink;
943 * };
944 */
945 static void nfs3_xdr_enc_readlink3args(struct rpc_rqst *req,
946 struct xdr_stream *xdr,
947 const void *data)
948 {
949 const struct nfs3_readlinkargs *args = data;
950
951 encode_nfs_fh3(xdr, args->fh);
952 prepare_reply_buffer(req, args->pages, args->pgbase,
953 args->pglen, NFS3_readlinkres_sz);
954 }
955
956 /*
957 * 3.3.6 READ3args
958 *
959 * struct READ3args {
960 * nfs_fh3 file;
961 * offset3 offset;
962 * count3 count;
963 * };
964 */
965 static void encode_read3args(struct xdr_stream *xdr,
966 const struct nfs_pgio_args *args)
967 {
968 __be32 *p;
969
970 encode_nfs_fh3(xdr, args->fh);
971
972 p = xdr_reserve_space(xdr, 8 + 4);
973 p = xdr_encode_hyper(p, args->offset);
974 *p = cpu_to_be32(args->count);
975 }
976
977 static void nfs3_xdr_enc_read3args(struct rpc_rqst *req,
978 struct xdr_stream *xdr,
979 const void *data)
980 {
981 const struct nfs_pgio_args *args = data;
982
983 encode_read3args(xdr, args);
984 prepare_reply_buffer(req, args->pages, args->pgbase,
985 args->count, NFS3_readres_sz);
986 req->rq_rcv_buf.flags |= XDRBUF_READ;
987 }
988
989 /*
990 * 3.3.7 WRITE3args
991 *
992 * enum stable_how {
993 * UNSTABLE = 0,
994 * DATA_SYNC = 1,
995 * FILE_SYNC = 2
996 * };
997 *
998 * struct WRITE3args {
999 * nfs_fh3 file;
1000 * offset3 offset;
1001 * count3 count;
1002 * stable_how stable;
1003 * opaque data<>;
1004 * };
1005 */
1006 static void encode_write3args(struct xdr_stream *xdr,
1007 const struct nfs_pgio_args *args)
1008 {
1009 __be32 *p;
1010
1011 encode_nfs_fh3(xdr, args->fh);
1012
1013 p = xdr_reserve_space(xdr, 8 + 4 + 4 + 4);
1014 p = xdr_encode_hyper(p, args->offset);
1015 *p++ = cpu_to_be32(args->count);
1016 *p++ = cpu_to_be32(args->stable);
1017 *p = cpu_to_be32(args->count);
1018 xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
1019 }
1020
1021 static void nfs3_xdr_enc_write3args(struct rpc_rqst *req,
1022 struct xdr_stream *xdr,
1023 const void *data)
1024 {
1025 const struct nfs_pgio_args *args = data;
1026
1027 encode_write3args(xdr, args);
1028 xdr->buf->flags |= XDRBUF_WRITE;
1029 }
1030
1031 /*
1032 * 3.3.8 CREATE3args
1033 *
1034 * enum createmode3 {
1035 * UNCHECKED = 0,
1036 * GUARDED = 1,
1037 * EXCLUSIVE = 2
1038 * };
1039 *
1040 * union createhow3 switch (createmode3 mode) {
1041 * case UNCHECKED:
1042 * case GUARDED:
1043 * sattr3 obj_attributes;
1044 * case EXCLUSIVE:
1045 * createverf3 verf;
1046 * };
1047 *
1048 * struct CREATE3args {
1049 * diropargs3 where;
1050 * createhow3 how;
1051 * };
1052 */
1053 static void encode_createhow3(struct xdr_stream *xdr,
1054 const struct nfs3_createargs *args)
1055 {
1056 encode_uint32(xdr, args->createmode);
1057 switch (args->createmode) {
1058 case NFS3_CREATE_UNCHECKED:
1059 case NFS3_CREATE_GUARDED:
1060 encode_sattr3(xdr, args->sattr);
1061 break;
1062 case NFS3_CREATE_EXCLUSIVE:
1063 encode_createverf3(xdr, args->verifier);
1064 break;
1065 default:
1066 BUG();
1067 }
1068 }
1069
1070 static void nfs3_xdr_enc_create3args(struct rpc_rqst *req,
1071 struct xdr_stream *xdr,
1072 const void *data)
1073 {
1074 const struct nfs3_createargs *args = data;
1075
1076 encode_diropargs3(xdr, args->fh, args->name, args->len);
1077 encode_createhow3(xdr, args);
1078 }
1079
1080 /*
1081 * 3.3.9 MKDIR3args
1082 *
1083 * struct MKDIR3args {
1084 * diropargs3 where;
1085 * sattr3 attributes;
1086 * };
1087 */
1088 static void nfs3_xdr_enc_mkdir3args(struct rpc_rqst *req,
1089 struct xdr_stream *xdr,
1090 const void *data)
1091 {
1092 const struct nfs3_mkdirargs *args = data;
1093
1094 encode_diropargs3(xdr, args->fh, args->name, args->len);
1095 encode_sattr3(xdr, args->sattr);
1096 }
1097
1098 /*
1099 * 3.3.10 SYMLINK3args
1100 *
1101 * struct symlinkdata3 {
1102 * sattr3 symlink_attributes;
1103 * nfspath3 symlink_data;
1104 * };
1105 *
1106 * struct SYMLINK3args {
1107 * diropargs3 where;
1108 * symlinkdata3 symlink;
1109 * };
1110 */
1111 static void encode_symlinkdata3(struct xdr_stream *xdr,
1112 const void *data)
1113 {
1114 const struct nfs3_symlinkargs *args = data;
1115
1116 encode_sattr3(xdr, args->sattr);
1117 encode_nfspath3(xdr, args->pages, args->pathlen);
1118 }
1119
1120 static void nfs3_xdr_enc_symlink3args(struct rpc_rqst *req,
1121 struct xdr_stream *xdr,
1122 const void *data)
1123 {
1124 const struct nfs3_symlinkargs *args = data;
1125
1126 encode_diropargs3(xdr, args->fromfh, args->fromname, args->fromlen);
1127 encode_symlinkdata3(xdr, args);
1128 xdr->buf->flags |= XDRBUF_WRITE;
1129 }
1130
1131 /*
1132 * 3.3.11 MKNOD3args
1133 *
1134 * struct devicedata3 {
1135 * sattr3 dev_attributes;
1136 * specdata3 spec;
1137 * };
1138 *
1139 * union mknoddata3 switch (ftype3 type) {
1140 * case NF3CHR:
1141 * case NF3BLK:
1142 * devicedata3 device;
1143 * case NF3SOCK:
1144 * case NF3FIFO:
1145 * sattr3 pipe_attributes;
1146 * default:
1147 * void;
1148 * };
1149 *
1150 * struct MKNOD3args {
1151 * diropargs3 where;
1152 * mknoddata3 what;
1153 * };
1154 */
1155 static void encode_devicedata3(struct xdr_stream *xdr,
1156 const struct nfs3_mknodargs *args)
1157 {
1158 encode_sattr3(xdr, args->sattr);
1159 encode_specdata3(xdr, args->rdev);
1160 }
1161
1162 static void encode_mknoddata3(struct xdr_stream *xdr,
1163 const struct nfs3_mknodargs *args)
1164 {
1165 encode_ftype3(xdr, args->type);
1166 switch (args->type) {
1167 case NF3CHR:
1168 case NF3BLK:
1169 encode_devicedata3(xdr, args);
1170 break;
1171 case NF3SOCK:
1172 case NF3FIFO:
1173 encode_sattr3(xdr, args->sattr);
1174 break;
1175 case NF3REG:
1176 case NF3DIR:
1177 break;
1178 default:
1179 BUG();
1180 }
1181 }
1182
1183 static void nfs3_xdr_enc_mknod3args(struct rpc_rqst *req,
1184 struct xdr_stream *xdr,
1185 const void *data)
1186 {
1187 const struct nfs3_mknodargs *args = data;
1188
1189 encode_diropargs3(xdr, args->fh, args->name, args->len);
1190 encode_mknoddata3(xdr, args);
1191 }
1192
1193 /*
1194 * 3.3.12 REMOVE3args
1195 *
1196 * struct REMOVE3args {
1197 * diropargs3 object;
1198 * };
1199 */
1200 static void nfs3_xdr_enc_remove3args(struct rpc_rqst *req,
1201 struct xdr_stream *xdr,
1202 const void *data)
1203 {
1204 const struct nfs_removeargs *args = data;
1205
1206 encode_diropargs3(xdr, args->fh, args->name.name, args->name.len);
1207 }
1208
1209 /*
1210 * 3.3.14 RENAME3args
1211 *
1212 * struct RENAME3args {
1213 * diropargs3 from;
1214 * diropargs3 to;
1215 * };
1216 */
1217 static void nfs3_xdr_enc_rename3args(struct rpc_rqst *req,
1218 struct xdr_stream *xdr,
1219 const void *data)
1220 {
1221 const struct nfs_renameargs *args = data;
1222 const struct qstr *old = args->old_name;
1223 const struct qstr *new = args->new_name;
1224
1225 encode_diropargs3(xdr, args->old_dir, old->name, old->len);
1226 encode_diropargs3(xdr, args->new_dir, new->name, new->len);
1227 }
1228
1229 /*
1230 * 3.3.15 LINK3args
1231 *
1232 * struct LINK3args {
1233 * nfs_fh3 file;
1234 * diropargs3 link;
1235 * };
1236 */
1237 static void nfs3_xdr_enc_link3args(struct rpc_rqst *req,
1238 struct xdr_stream *xdr,
1239 const void *data)
1240 {
1241 const struct nfs3_linkargs *args = data;
1242
1243 encode_nfs_fh3(xdr, args->fromfh);
1244 encode_diropargs3(xdr, args->tofh, args->toname, args->tolen);
1245 }
1246
1247 /*
1248 * 3.3.16 READDIR3args
1249 *
1250 * struct READDIR3args {
1251 * nfs_fh3 dir;
1252 * cookie3 cookie;
1253 * cookieverf3 cookieverf;
1254 * count3 count;
1255 * };
1256 */
1257 static void encode_readdir3args(struct xdr_stream *xdr,
1258 const struct nfs3_readdirargs *args)
1259 {
1260 __be32 *p;
1261
1262 encode_nfs_fh3(xdr, args->fh);
1263
1264 p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4);
1265 p = xdr_encode_cookie3(p, args->cookie);
1266 p = xdr_encode_cookieverf3(p, args->verf);
1267 *p = cpu_to_be32(args->count);
1268 }
1269
1270 static void nfs3_xdr_enc_readdir3args(struct rpc_rqst *req,
1271 struct xdr_stream *xdr,
1272 const void *data)
1273 {
1274 const struct nfs3_readdirargs *args = data;
1275
1276 encode_readdir3args(xdr, args);
1277 prepare_reply_buffer(req, args->pages, 0,
1278 args->count, NFS3_readdirres_sz);
1279 }
1280
1281 /*
1282 * 3.3.17 READDIRPLUS3args
1283 *
1284 * struct READDIRPLUS3args {
1285 * nfs_fh3 dir;
1286 * cookie3 cookie;
1287 * cookieverf3 cookieverf;
1288 * count3 dircount;
1289 * count3 maxcount;
1290 * };
1291 */
1292 static void encode_readdirplus3args(struct xdr_stream *xdr,
1293 const struct nfs3_readdirargs *args)
1294 {
1295 __be32 *p;
1296
1297 encode_nfs_fh3(xdr, args->fh);
1298
1299 p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4 + 4);
1300 p = xdr_encode_cookie3(p, args->cookie);
1301 p = xdr_encode_cookieverf3(p, args->verf);
1302
1303 /*
1304 * readdirplus: need dircount + buffer size.
1305 * We just make sure we make dircount big enough
1306 */
1307 *p++ = cpu_to_be32(args->count >> 3);
1308
1309 *p = cpu_to_be32(args->count);
1310 }
1311
1312 static void nfs3_xdr_enc_readdirplus3args(struct rpc_rqst *req,
1313 struct xdr_stream *xdr,
1314 const void *data)
1315 {
1316 const struct nfs3_readdirargs *args = data;
1317
1318 encode_readdirplus3args(xdr, args);
1319 prepare_reply_buffer(req, args->pages, 0,
1320 args->count, NFS3_readdirres_sz);
1321 }
1322
1323 /*
1324 * 3.3.21 COMMIT3args
1325 *
1326 * struct COMMIT3args {
1327 * nfs_fh3 file;
1328 * offset3 offset;
1329 * count3 count;
1330 * };
1331 */
1332 static void encode_commit3args(struct xdr_stream *xdr,
1333 const struct nfs_commitargs *args)
1334 {
1335 __be32 *p;
1336
1337 encode_nfs_fh3(xdr, args->fh);
1338
1339 p = xdr_reserve_space(xdr, 8 + 4);
1340 p = xdr_encode_hyper(p, args->offset);
1341 *p = cpu_to_be32(args->count);
1342 }
1343
1344 static void nfs3_xdr_enc_commit3args(struct rpc_rqst *req,
1345 struct xdr_stream *xdr,
1346 const void *data)
1347 {
1348 const struct nfs_commitargs *args = data;
1349
1350 encode_commit3args(xdr, args);
1351 }
1352
1353 #ifdef CONFIG_NFS_V3_ACL
1354
1355 static void nfs3_xdr_enc_getacl3args(struct rpc_rqst *req,
1356 struct xdr_stream *xdr,
1357 const void *data)
1358 {
1359 const struct nfs3_getaclargs *args = data;
1360
1361 encode_nfs_fh3(xdr, args->fh);
1362 encode_uint32(xdr, args->mask);
1363 if (args->mask & (NFS_ACL | NFS_DFACL))
1364 prepare_reply_buffer(req, args->pages, 0,
1365 NFSACL_MAXPAGES << PAGE_SHIFT,
1366 ACL3_getaclres_sz);
1367 }
1368
1369 static void nfs3_xdr_enc_setacl3args(struct rpc_rqst *req,
1370 struct xdr_stream *xdr,
1371 const void *data)
1372 {
1373 const struct nfs3_setaclargs *args = data;
1374 unsigned int base;
1375 int error;
1376
1377 encode_nfs_fh3(xdr, NFS_FH(args->inode));
1378 encode_uint32(xdr, args->mask);
1379
1380 base = req->rq_slen;
1381 if (args->npages != 0)
1382 xdr_write_pages(xdr, args->pages, 0, args->len);
1383 else
1384 xdr_reserve_space(xdr, args->len);
1385
1386 error = nfsacl_encode(xdr->buf, base, args->inode,
1387 (args->mask & NFS_ACL) ?
1388 args->acl_access : NULL, 1, 0);
1389 /* FIXME: this is just broken */
1390 BUG_ON(error < 0);
1391 error = nfsacl_encode(xdr->buf, base + error, args->inode,
1392 (args->mask & NFS_DFACL) ?
1393 args->acl_default : NULL, 1,
1394 NFS_ACL_DEFAULT);
1395 BUG_ON(error < 0);
1396 }
1397
1398 #endif /* CONFIG_NFS_V3_ACL */
1399
1400 /*
1401 * NFSv3 XDR decode functions
1402 *
1403 * NFSv3 result types are defined in section 3.3 of RFC 1813:
1404 * "NFS Version 3 Protocol Specification".
1405 */
1406
1407 /*
1408 * 3.3.1 GETATTR3res
1409 *
1410 * struct GETATTR3resok {
1411 * fattr3 obj_attributes;
1412 * };
1413 *
1414 * union GETATTR3res switch (nfsstat3 status) {
1415 * case NFS3_OK:
1416 * GETATTR3resok resok;
1417 * default:
1418 * void;
1419 * };
1420 */
1421 static int nfs3_xdr_dec_getattr3res(struct rpc_rqst *req,
1422 struct xdr_stream *xdr,
1423 void *result)
1424 {
1425 enum nfs_stat status;
1426 int error;
1427
1428 error = decode_nfsstat3(xdr, &status);
1429 if (unlikely(error))
1430 goto out;
1431 if (status != NFS3_OK)
1432 goto out_default;
1433 error = decode_fattr3(xdr, result);
1434 out:
1435 return error;
1436 out_default:
1437 return nfs3_stat_to_errno(status);
1438 }
1439
1440 /*
1441 * 3.3.2 SETATTR3res
1442 *
1443 * struct SETATTR3resok {
1444 * wcc_data obj_wcc;
1445 * };
1446 *
1447 * struct SETATTR3resfail {
1448 * wcc_data obj_wcc;
1449 * };
1450 *
1451 * union SETATTR3res switch (nfsstat3 status) {
1452 * case NFS3_OK:
1453 * SETATTR3resok resok;
1454 * default:
1455 * SETATTR3resfail resfail;
1456 * };
1457 */
1458 static int nfs3_xdr_dec_setattr3res(struct rpc_rqst *req,
1459 struct xdr_stream *xdr,
1460 void *result)
1461 {
1462 enum nfs_stat status;
1463 int error;
1464
1465 error = decode_nfsstat3(xdr, &status);
1466 if (unlikely(error))
1467 goto out;
1468 error = decode_wcc_data(xdr, result);
1469 if (unlikely(error))
1470 goto out;
1471 if (status != NFS3_OK)
1472 goto out_status;
1473 out:
1474 return error;
1475 out_status:
1476 return nfs3_stat_to_errno(status);
1477 }
1478
1479 /*
1480 * 3.3.3 LOOKUP3res
1481 *
1482 * struct LOOKUP3resok {
1483 * nfs_fh3 object;
1484 * post_op_attr obj_attributes;
1485 * post_op_attr dir_attributes;
1486 * };
1487 *
1488 * struct LOOKUP3resfail {
1489 * post_op_attr dir_attributes;
1490 * };
1491 *
1492 * union LOOKUP3res switch (nfsstat3 status) {
1493 * case NFS3_OK:
1494 * LOOKUP3resok resok;
1495 * default:
1496 * LOOKUP3resfail resfail;
1497 * };
1498 */
1499 static int nfs3_xdr_dec_lookup3res(struct rpc_rqst *req,
1500 struct xdr_stream *xdr,
1501 void *data)
1502 {
1503 struct nfs3_diropres *result = data;
1504 enum nfs_stat status;
1505 int error;
1506
1507 error = decode_nfsstat3(xdr, &status);
1508 if (unlikely(error))
1509 goto out;
1510 if (status != NFS3_OK)
1511 goto out_default;
1512 error = decode_nfs_fh3(xdr, result->fh);
1513 if (unlikely(error))
1514 goto out;
1515 error = decode_post_op_attr(xdr, result->fattr);
1516 if (unlikely(error))
1517 goto out;
1518 error = decode_post_op_attr(xdr, result->dir_attr);
1519 out:
1520 return error;
1521 out_default:
1522 error = decode_post_op_attr(xdr, result->dir_attr);
1523 if (unlikely(error))
1524 goto out;
1525 return nfs3_stat_to_errno(status);
1526 }
1527
1528 /*
1529 * 3.3.4 ACCESS3res
1530 *
1531 * struct ACCESS3resok {
1532 * post_op_attr obj_attributes;
1533 * uint32 access;
1534 * };
1535 *
1536 * struct ACCESS3resfail {
1537 * post_op_attr obj_attributes;
1538 * };
1539 *
1540 * union ACCESS3res switch (nfsstat3 status) {
1541 * case NFS3_OK:
1542 * ACCESS3resok resok;
1543 * default:
1544 * ACCESS3resfail resfail;
1545 * };
1546 */
1547 static int nfs3_xdr_dec_access3res(struct rpc_rqst *req,
1548 struct xdr_stream *xdr,
1549 void *data)
1550 {
1551 struct nfs3_accessres *result = data;
1552 enum nfs_stat status;
1553 int error;
1554
1555 error = decode_nfsstat3(xdr, &status);
1556 if (unlikely(error))
1557 goto out;
1558 error = decode_post_op_attr(xdr, result->fattr);
1559 if (unlikely(error))
1560 goto out;
1561 if (status != NFS3_OK)
1562 goto out_default;
1563 error = decode_uint32(xdr, &result->access);
1564 out:
1565 return error;
1566 out_default:
1567 return nfs3_stat_to_errno(status);
1568 }
1569
1570 /*
1571 * 3.3.5 READLINK3res
1572 *
1573 * struct READLINK3resok {
1574 * post_op_attr symlink_attributes;
1575 * nfspath3 data;
1576 * };
1577 *
1578 * struct READLINK3resfail {
1579 * post_op_attr symlink_attributes;
1580 * };
1581 *
1582 * union READLINK3res switch (nfsstat3 status) {
1583 * case NFS3_OK:
1584 * READLINK3resok resok;
1585 * default:
1586 * READLINK3resfail resfail;
1587 * };
1588 */
1589 static int nfs3_xdr_dec_readlink3res(struct rpc_rqst *req,
1590 struct xdr_stream *xdr,
1591 void *result)
1592 {
1593 enum nfs_stat status;
1594 int error;
1595
1596 error = decode_nfsstat3(xdr, &status);
1597 if (unlikely(error))
1598 goto out;
1599 error = decode_post_op_attr(xdr, result);
1600 if (unlikely(error))
1601 goto out;
1602 if (status != NFS3_OK)
1603 goto out_default;
1604 error = decode_nfspath3(xdr);
1605 out:
1606 return error;
1607 out_default:
1608 return nfs3_stat_to_errno(status);
1609 }
1610
1611 /*
1612 * 3.3.6 READ3res
1613 *
1614 * struct READ3resok {
1615 * post_op_attr file_attributes;
1616 * count3 count;
1617 * bool eof;
1618 * opaque data<>;
1619 * };
1620 *
1621 * struct READ3resfail {
1622 * post_op_attr file_attributes;
1623 * };
1624 *
1625 * union READ3res switch (nfsstat3 status) {
1626 * case NFS3_OK:
1627 * READ3resok resok;
1628 * default:
1629 * READ3resfail resfail;
1630 * };
1631 */
1632 static int decode_read3resok(struct xdr_stream *xdr,
1633 struct nfs_pgio_res *result)
1634 {
1635 u32 eof, count, ocount, recvd;
1636 __be32 *p;
1637
1638 p = xdr_inline_decode(xdr, 4 + 4 + 4);
1639 if (unlikely(p == NULL))
1640 goto out_overflow;
1641 count = be32_to_cpup(p++);
1642 eof = be32_to_cpup(p++);
1643 ocount = be32_to_cpup(p++);
1644 if (unlikely(ocount != count))
1645 goto out_mismatch;
1646 recvd = xdr_read_pages(xdr, count);
1647 if (unlikely(count > recvd))
1648 goto out_cheating;
1649 out:
1650 result->eof = eof;
1651 result->count = count;
1652 return count;
1653 out_mismatch:
1654 dprintk("NFS: READ count doesn't match length of opaque: "
1655 "count %u != ocount %u\n", count, ocount);
1656 return -EIO;
1657 out_cheating:
1658 dprintk("NFS: server cheating in read result: "
1659 "count %u > recvd %u\n", count, recvd);
1660 count = recvd;
1661 eof = 0;
1662 goto out;
1663 out_overflow:
1664 print_overflow_msg(__func__, xdr);
1665 return -EIO;
1666 }
1667
1668 static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1669 void *data)
1670 {
1671 struct nfs_pgio_res *result = data;
1672 enum nfs_stat status;
1673 int error;
1674
1675 error = decode_nfsstat3(xdr, &status);
1676 if (unlikely(error))
1677 goto out;
1678 error = decode_post_op_attr(xdr, result->fattr);
1679 if (unlikely(error))
1680 goto out;
1681 result->op_status = status;
1682 if (status != NFS3_OK)
1683 goto out_status;
1684 error = decode_read3resok(xdr, result);
1685 out:
1686 return error;
1687 out_status:
1688 return nfs3_stat_to_errno(status);
1689 }
1690
1691 /*
1692 * 3.3.7 WRITE3res
1693 *
1694 * enum stable_how {
1695 * UNSTABLE = 0,
1696 * DATA_SYNC = 1,
1697 * FILE_SYNC = 2
1698 * };
1699 *
1700 * struct WRITE3resok {
1701 * wcc_data file_wcc;
1702 * count3 count;
1703 * stable_how committed;
1704 * writeverf3 verf;
1705 * };
1706 *
1707 * struct WRITE3resfail {
1708 * wcc_data file_wcc;
1709 * };
1710 *
1711 * union WRITE3res switch (nfsstat3 status) {
1712 * case NFS3_OK:
1713 * WRITE3resok resok;
1714 * default:
1715 * WRITE3resfail resfail;
1716 * };
1717 */
1718 static int decode_write3resok(struct xdr_stream *xdr,
1719 struct nfs_pgio_res *result)
1720 {
1721 __be32 *p;
1722
1723 p = xdr_inline_decode(xdr, 4 + 4);
1724 if (unlikely(p == NULL))
1725 goto out_overflow;
1726 result->count = be32_to_cpup(p++);
1727 result->verf->committed = be32_to_cpup(p++);
1728 if (unlikely(result->verf->committed > NFS_FILE_SYNC))
1729 goto out_badvalue;
1730 if (decode_writeverf3(xdr, &result->verf->verifier))
1731 goto out_eio;
1732 return result->count;
1733 out_badvalue:
1734 dprintk("NFS: bad stable_how value: %u\n", result->verf->committed);
1735 return -EIO;
1736 out_overflow:
1737 print_overflow_msg(__func__, xdr);
1738 out_eio:
1739 return -EIO;
1740 }
1741
1742 static int nfs3_xdr_dec_write3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1743 void *data)
1744 {
1745 struct nfs_pgio_res *result = data;
1746 enum nfs_stat status;
1747 int error;
1748
1749 error = decode_nfsstat3(xdr, &status);
1750 if (unlikely(error))
1751 goto out;
1752 error = decode_wcc_data(xdr, result->fattr);
1753 if (unlikely(error))
1754 goto out;
1755 result->op_status = status;
1756 if (status != NFS3_OK)
1757 goto out_status;
1758 error = decode_write3resok(xdr, result);
1759 out:
1760 return error;
1761 out_status:
1762 return nfs3_stat_to_errno(status);
1763 }
1764
1765 /*
1766 * 3.3.8 CREATE3res
1767 *
1768 * struct CREATE3resok {
1769 * post_op_fh3 obj;
1770 * post_op_attr obj_attributes;
1771 * wcc_data dir_wcc;
1772 * };
1773 *
1774 * struct CREATE3resfail {
1775 * wcc_data dir_wcc;
1776 * };
1777 *
1778 * union CREATE3res switch (nfsstat3 status) {
1779 * case NFS3_OK:
1780 * CREATE3resok resok;
1781 * default:
1782 * CREATE3resfail resfail;
1783 * };
1784 */
1785 static int decode_create3resok(struct xdr_stream *xdr,
1786 struct nfs3_diropres *result)
1787 {
1788 int error;
1789
1790 error = decode_post_op_fh3(xdr, result->fh);
1791 if (unlikely(error))
1792 goto out;
1793 error = decode_post_op_attr(xdr, result->fattr);
1794 if (unlikely(error))
1795 goto out;
1796 /* The server isn't required to return a file handle.
1797 * If it didn't, force the client to perform a LOOKUP
1798 * to determine the correct file handle and attribute
1799 * values for the new object. */
1800 if (result->fh->size == 0)
1801 result->fattr->valid = 0;
1802 error = decode_wcc_data(xdr, result->dir_attr);
1803 out:
1804 return error;
1805 }
1806
1807 static int nfs3_xdr_dec_create3res(struct rpc_rqst *req,
1808 struct xdr_stream *xdr,
1809 void *data)
1810 {
1811 struct nfs3_diropres *result = data;
1812 enum nfs_stat status;
1813 int error;
1814
1815 error = decode_nfsstat3(xdr, &status);
1816 if (unlikely(error))
1817 goto out;
1818 if (status != NFS3_OK)
1819 goto out_default;
1820 error = decode_create3resok(xdr, result);
1821 out:
1822 return error;
1823 out_default:
1824 error = decode_wcc_data(xdr, result->dir_attr);
1825 if (unlikely(error))
1826 goto out;
1827 return nfs3_stat_to_errno(status);
1828 }
1829
1830 /*
1831 * 3.3.12 REMOVE3res
1832 *
1833 * struct REMOVE3resok {
1834 * wcc_data dir_wcc;
1835 * };
1836 *
1837 * struct REMOVE3resfail {
1838 * wcc_data dir_wcc;
1839 * };
1840 *
1841 * union REMOVE3res switch (nfsstat3 status) {
1842 * case NFS3_OK:
1843 * REMOVE3resok resok;
1844 * default:
1845 * REMOVE3resfail resfail;
1846 * };
1847 */
1848 static int nfs3_xdr_dec_remove3res(struct rpc_rqst *req,
1849 struct xdr_stream *xdr,
1850 void *data)
1851 {
1852 struct nfs_removeres *result = data;
1853 enum nfs_stat status;
1854 int error;
1855
1856 error = decode_nfsstat3(xdr, &status);
1857 if (unlikely(error))
1858 goto out;
1859 error = decode_wcc_data(xdr, result->dir_attr);
1860 if (unlikely(error))
1861 goto out;
1862 if (status != NFS3_OK)
1863 goto out_status;
1864 out:
1865 return error;
1866 out_status:
1867 return nfs3_stat_to_errno(status);
1868 }
1869
1870 /*
1871 * 3.3.14 RENAME3res
1872 *
1873 * struct RENAME3resok {
1874 * wcc_data fromdir_wcc;
1875 * wcc_data todir_wcc;
1876 * };
1877 *
1878 * struct RENAME3resfail {
1879 * wcc_data fromdir_wcc;
1880 * wcc_data todir_wcc;
1881 * };
1882 *
1883 * union RENAME3res switch (nfsstat3 status) {
1884 * case NFS3_OK:
1885 * RENAME3resok resok;
1886 * default:
1887 * RENAME3resfail resfail;
1888 * };
1889 */
1890 static int nfs3_xdr_dec_rename3res(struct rpc_rqst *req,
1891 struct xdr_stream *xdr,
1892 void *data)
1893 {
1894 struct nfs_renameres *result = data;
1895 enum nfs_stat status;
1896 int error;
1897
1898 error = decode_nfsstat3(xdr, &status);
1899 if (unlikely(error))
1900 goto out;
1901 error = decode_wcc_data(xdr, result->old_fattr);
1902 if (unlikely(error))
1903 goto out;
1904 error = decode_wcc_data(xdr, result->new_fattr);
1905 if (unlikely(error))
1906 goto out;
1907 if (status != NFS3_OK)
1908 goto out_status;
1909 out:
1910 return error;
1911 out_status:
1912 return nfs3_stat_to_errno(status);
1913 }
1914
1915 /*
1916 * 3.3.15 LINK3res
1917 *
1918 * struct LINK3resok {
1919 * post_op_attr file_attributes;
1920 * wcc_data linkdir_wcc;
1921 * };
1922 *
1923 * struct LINK3resfail {
1924 * post_op_attr file_attributes;
1925 * wcc_data linkdir_wcc;
1926 * };
1927 *
1928 * union LINK3res switch (nfsstat3 status) {
1929 * case NFS3_OK:
1930 * LINK3resok resok;
1931 * default:
1932 * LINK3resfail resfail;
1933 * };
1934 */
1935 static int nfs3_xdr_dec_link3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1936 void *data)
1937 {
1938 struct nfs3_linkres *result = data;
1939 enum nfs_stat status;
1940 int error;
1941
1942 error = decode_nfsstat3(xdr, &status);
1943 if (unlikely(error))
1944 goto out;
1945 error = decode_post_op_attr(xdr, result->fattr);
1946 if (unlikely(error))
1947 goto out;
1948 error = decode_wcc_data(xdr, result->dir_attr);
1949 if (unlikely(error))
1950 goto out;
1951 if (status != NFS3_OK)
1952 goto out_status;
1953 out:
1954 return error;
1955 out_status:
1956 return nfs3_stat_to_errno(status);
1957 }
1958
1959 /**
1960 * nfs3_decode_dirent - Decode a single NFSv3 directory entry stored in
1961 * the local page cache
1962 * @xdr: XDR stream where entry resides
1963 * @entry: buffer to fill in with entry data
1964 * @plus: boolean indicating whether this should be a readdirplus entry
1965 *
1966 * Returns zero if successful, otherwise a negative errno value is
1967 * returned.
1968 *
1969 * This function is not invoked during READDIR reply decoding, but
1970 * rather whenever an application invokes the getdents(2) system call
1971 * on a directory already in our cache.
1972 *
1973 * 3.3.16 entry3
1974 *
1975 * struct entry3 {
1976 * fileid3 fileid;
1977 * filename3 name;
1978 * cookie3 cookie;
1979 * fhandle3 filehandle;
1980 * post_op_attr3 attributes;
1981 * entry3 *nextentry;
1982 * };
1983 *
1984 * 3.3.17 entryplus3
1985 * struct entryplus3 {
1986 * fileid3 fileid;
1987 * filename3 name;
1988 * cookie3 cookie;
1989 * post_op_attr name_attributes;
1990 * post_op_fh3 name_handle;
1991 * entryplus3 *nextentry;
1992 * };
1993 */
1994 int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
1995 bool plus)
1996 {
1997 struct nfs_entry old = *entry;
1998 __be32 *p;
1999 int error;
2000
2001 p = xdr_inline_decode(xdr, 4);
2002 if (unlikely(p == NULL))
2003 goto out_overflow;
2004 if (*p == xdr_zero) {
2005 p = xdr_inline_decode(xdr, 4);
2006 if (unlikely(p == NULL))
2007 goto out_overflow;
2008 if (*p == xdr_zero)
2009 return -EAGAIN;
2010 entry->eof = 1;
2011 return -EBADCOOKIE;
2012 }
2013
2014 error = decode_fileid3(xdr, &entry->ino);
2015 if (unlikely(error))
2016 return error;
2017
2018 error = decode_inline_filename3(xdr, &entry->name, &entry->len);
2019 if (unlikely(error))
2020 return error;
2021
2022 entry->prev_cookie = entry->cookie;
2023 error = decode_cookie3(xdr, &entry->cookie);
2024 if (unlikely(error))
2025 return error;
2026
2027 entry->d_type = DT_UNKNOWN;
2028
2029 if (plus) {
2030 entry->fattr->valid = 0;
2031 error = decode_post_op_attr(xdr, entry->fattr);
2032 if (unlikely(error))
2033 return error;
2034 if (entry->fattr->valid & NFS_ATTR_FATTR_V3)
2035 entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);
2036
2037 if (entry->fattr->fileid != entry->ino) {
2038 entry->fattr->mounted_on_fileid = entry->ino;
2039 entry->fattr->valid |= NFS_ATTR_FATTR_MOUNTED_ON_FILEID;
2040 }
2041
2042 /* In fact, a post_op_fh3: */
2043 p = xdr_inline_decode(xdr, 4);
2044 if (unlikely(p == NULL))
2045 goto out_overflow;
2046 if (*p != xdr_zero) {
2047 error = decode_nfs_fh3(xdr, entry->fh);
2048 if (unlikely(error)) {
2049 if (error == -E2BIG)
2050 goto out_truncated;
2051 return error;
2052 }
2053 } else
2054 zero_nfs_fh3(entry->fh);
2055 }
2056
2057 return 0;
2058
2059 out_overflow:
2060 print_overflow_msg(__func__, xdr);
2061 return -EAGAIN;
2062 out_truncated:
2063 dprintk("NFS: directory entry contains invalid file handle\n");
2064 *entry = old;
2065 return -EAGAIN;
2066 }
2067
2068 /*
2069 * 3.3.16 READDIR3res
2070 *
2071 * struct dirlist3 {
2072 * entry3 *entries;
2073 * bool eof;
2074 * };
2075 *
2076 * struct READDIR3resok {
2077 * post_op_attr dir_attributes;
2078 * cookieverf3 cookieverf;
2079 * dirlist3 reply;
2080 * };
2081 *
2082 * struct READDIR3resfail {
2083 * post_op_attr dir_attributes;
2084 * };
2085 *
2086 * union READDIR3res switch (nfsstat3 status) {
2087 * case NFS3_OK:
2088 * READDIR3resok resok;
2089 * default:
2090 * READDIR3resfail resfail;
2091 * };
2092 *
2093 * Read the directory contents into the page cache, but otherwise
2094 * don't touch them. The actual decoding is done by nfs3_decode_entry()
2095 * during subsequent nfs_readdir() calls.
2096 */
2097 static int decode_dirlist3(struct xdr_stream *xdr)
2098 {
2099 return xdr_read_pages(xdr, xdr->buf->page_len);
2100 }
2101
2102 static int decode_readdir3resok(struct xdr_stream *xdr,
2103 struct nfs3_readdirres *result)
2104 {
2105 int error;
2106
2107 error = decode_post_op_attr(xdr, result->dir_attr);
2108 if (unlikely(error))
2109 goto out;
2110 /* XXX: do we need to check if result->verf != NULL ? */
2111 error = decode_cookieverf3(xdr, result->verf);
2112 if (unlikely(error))
2113 goto out;
2114 error = decode_dirlist3(xdr);
2115 out:
2116 return error;
2117 }
2118
2119 static int nfs3_xdr_dec_readdir3res(struct rpc_rqst *req,
2120 struct xdr_stream *xdr,
2121 void *data)
2122 {
2123 struct nfs3_readdirres *result = data;
2124 enum nfs_stat status;
2125 int error;
2126
2127 error = decode_nfsstat3(xdr, &status);
2128 if (unlikely(error))
2129 goto out;
2130 if (status != NFS3_OK)
2131 goto out_default;
2132 error = decode_readdir3resok(xdr, result);
2133 out:
2134 return error;
2135 out_default:
2136 error = decode_post_op_attr(xdr, result->dir_attr);
2137 if (unlikely(error))
2138 goto out;
2139 return nfs3_stat_to_errno(status);
2140 }
2141
2142 /*
2143 * 3.3.18 FSSTAT3res
2144 *
2145 * struct FSSTAT3resok {
2146 * post_op_attr obj_attributes;
2147 * size3 tbytes;
2148 * size3 fbytes;
2149 * size3 abytes;
2150 * size3 tfiles;
2151 * size3 ffiles;
2152 * size3 afiles;
2153 * uint32 invarsec;
2154 * };
2155 *
2156 * struct FSSTAT3resfail {
2157 * post_op_attr obj_attributes;
2158 * };
2159 *
2160 * union FSSTAT3res switch (nfsstat3 status) {
2161 * case NFS3_OK:
2162 * FSSTAT3resok resok;
2163 * default:
2164 * FSSTAT3resfail resfail;
2165 * };
2166 */
2167 static int decode_fsstat3resok(struct xdr_stream *xdr,
2168 struct nfs_fsstat *result)
2169 {
2170 __be32 *p;
2171
2172 p = xdr_inline_decode(xdr, 8 * 6 + 4);
2173 if (unlikely(p == NULL))
2174 goto out_overflow;
2175 p = xdr_decode_size3(p, &result->tbytes);
2176 p = xdr_decode_size3(p, &result->fbytes);
2177 p = xdr_decode_size3(p, &result->abytes);
2178 p = xdr_decode_size3(p, &result->tfiles);
2179 p = xdr_decode_size3(p, &result->ffiles);
2180 xdr_decode_size3(p, &result->afiles);
2181 /* ignore invarsec */
2182 return 0;
2183 out_overflow:
2184 print_overflow_msg(__func__, xdr);
2185 return -EIO;
2186 }
2187
2188 static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req,
2189 struct xdr_stream *xdr,
2190 void *data)
2191 {
2192 struct nfs_fsstat *result = data;
2193 enum nfs_stat status;
2194 int error;
2195
2196 error = decode_nfsstat3(xdr, &status);
2197 if (unlikely(error))
2198 goto out;
2199 error = decode_post_op_attr(xdr, result->fattr);
2200 if (unlikely(error))
2201 goto out;
2202 if (status != NFS3_OK)
2203 goto out_status;
2204 error = decode_fsstat3resok(xdr, result);
2205 out:
2206 return error;
2207 out_status:
2208 return nfs3_stat_to_errno(status);
2209 }
2210
2211 /*
2212 * 3.3.19 FSINFO3res
2213 *
2214 * struct FSINFO3resok {
2215 * post_op_attr obj_attributes;
2216 * uint32 rtmax;
2217 * uint32 rtpref;
2218 * uint32 rtmult;
2219 * uint32 wtmax;
2220 * uint32 wtpref;
2221 * uint32 wtmult;
2222 * uint32 dtpref;
2223 * size3 maxfilesize;
2224 * nfstime3 time_delta;
2225 * uint32 properties;
2226 * };
2227 *
2228 * struct FSINFO3resfail {
2229 * post_op_attr obj_attributes;
2230 * };
2231 *
2232 * union FSINFO3res switch (nfsstat3 status) {
2233 * case NFS3_OK:
2234 * FSINFO3resok resok;
2235 * default:
2236 * FSINFO3resfail resfail;
2237 * };
2238 */
2239 static int decode_fsinfo3resok(struct xdr_stream *xdr,
2240 struct nfs_fsinfo *result)
2241 {
2242 __be32 *p;
2243
2244 p = xdr_inline_decode(xdr, 4 * 7 + 8 + 8 + 4);
2245 if (unlikely(p == NULL))
2246 goto out_overflow;
2247 result->rtmax = be32_to_cpup(p++);
2248 result->rtpref = be32_to_cpup(p++);
2249 result->rtmult = be32_to_cpup(p++);
2250 result->wtmax = be32_to_cpup(p++);
2251 result->wtpref = be32_to_cpup(p++);
2252 result->wtmult = be32_to_cpup(p++);
2253 result->dtpref = be32_to_cpup(p++);
2254 p = xdr_decode_size3(p, &result->maxfilesize);
2255 xdr_decode_nfstime3(p, &result->time_delta);
2256
2257 /* ignore properties */
2258 result->lease_time = 0;
2259 return 0;
2260 out_overflow:
2261 print_overflow_msg(__func__, xdr);
2262 return -EIO;
2263 }
2264
2265 static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req,
2266 struct xdr_stream *xdr,
2267 void *data)
2268 {
2269 struct nfs_fsinfo *result = data;
2270 enum nfs_stat status;
2271 int error;
2272
2273 error = decode_nfsstat3(xdr, &status);
2274 if (unlikely(error))
2275 goto out;
2276 error = decode_post_op_attr(xdr, result->fattr);
2277 if (unlikely(error))
2278 goto out;
2279 if (status != NFS3_OK)
2280 goto out_status;
2281 error = decode_fsinfo3resok(xdr, result);
2282 out:
2283 return error;
2284 out_status:
2285 return nfs3_stat_to_errno(status);
2286 }
2287
2288 /*
2289 * 3.3.20 PATHCONF3res
2290 *
2291 * struct PATHCONF3resok {
2292 * post_op_attr obj_attributes;
2293 * uint32 linkmax;
2294 * uint32 name_max;
2295 * bool no_trunc;
2296 * bool chown_restricted;
2297 * bool case_insensitive;
2298 * bool case_preserving;
2299 * };
2300 *
2301 * struct PATHCONF3resfail {
2302 * post_op_attr obj_attributes;
2303 * };
2304 *
2305 * union PATHCONF3res switch (nfsstat3 status) {
2306 * case NFS3_OK:
2307 * PATHCONF3resok resok;
2308 * default:
2309 * PATHCONF3resfail resfail;
2310 * };
2311 */
2312 static int decode_pathconf3resok(struct xdr_stream *xdr,
2313 struct nfs_pathconf *result)
2314 {
2315 __be32 *p;
2316
2317 p = xdr_inline_decode(xdr, 4 * 6);
2318 if (unlikely(p == NULL))
2319 goto out_overflow;
2320 result->max_link = be32_to_cpup(p++);
2321 result->max_namelen = be32_to_cpup(p);
2322 /* ignore remaining fields */
2323 return 0;
2324 out_overflow:
2325 print_overflow_msg(__func__, xdr);
2326 return -EIO;
2327 }
2328
2329 static int nfs3_xdr_dec_pathconf3res(struct rpc_rqst *req,
2330 struct xdr_stream *xdr,
2331 void *data)
2332 {
2333 struct nfs_pathconf *result = data;
2334 enum nfs_stat status;
2335 int error;
2336
2337 error = decode_nfsstat3(xdr, &status);
2338 if (unlikely(error))
2339 goto out;
2340 error = decode_post_op_attr(xdr, result->fattr);
2341 if (unlikely(error))
2342 goto out;
2343 if (status != NFS3_OK)
2344 goto out_status;
2345 error = decode_pathconf3resok(xdr, result);
2346 out:
2347 return error;
2348 out_status:
2349 return nfs3_stat_to_errno(status);
2350 }
2351
2352 /*
2353 * 3.3.21 COMMIT3res
2354 *
2355 * struct COMMIT3resok {
2356 * wcc_data file_wcc;
2357 * writeverf3 verf;
2358 * };
2359 *
2360 * struct COMMIT3resfail {
2361 * wcc_data file_wcc;
2362 * };
2363 *
2364 * union COMMIT3res switch (nfsstat3 status) {
2365 * case NFS3_OK:
2366 * COMMIT3resok resok;
2367 * default:
2368 * COMMIT3resfail resfail;
2369 * };
2370 */
2371 static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req,
2372 struct xdr_stream *xdr,
2373 void *data)
2374 {
2375 struct nfs_commitres *result = data;
2376 struct nfs_writeverf *verf = result->verf;
2377 enum nfs_stat status;
2378 int error;
2379
2380 error = decode_nfsstat3(xdr, &status);
2381 if (unlikely(error))
2382 goto out;
2383 error = decode_wcc_data(xdr, result->fattr);
2384 if (unlikely(error))
2385 goto out;
2386 result->op_status = status;
2387 if (status != NFS3_OK)
2388 goto out_status;
2389 error = decode_writeverf3(xdr, &verf->verifier);
2390 if (!error)
2391 verf->committed = NFS_FILE_SYNC;
2392 out:
2393 return error;
2394 out_status:
2395 return nfs3_stat_to_errno(status);
2396 }
2397
2398 #ifdef CONFIG_NFS_V3_ACL
2399
2400 static inline int decode_getacl3resok(struct xdr_stream *xdr,
2401 struct nfs3_getaclres *result)
2402 {
2403 struct posix_acl **acl;
2404 unsigned int *aclcnt;
2405 size_t hdrlen;
2406 int error;
2407
2408 error = decode_post_op_attr(xdr, result->fattr);
2409 if (unlikely(error))
2410 goto out;
2411 error = decode_uint32(xdr, &result->mask);
2412 if (unlikely(error))
2413 goto out;
2414 error = -EINVAL;
2415 if (result->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
2416 goto out;
2417
2418 hdrlen = xdr_stream_pos(xdr);
2419
2420 acl = NULL;
2421 if (result->mask & NFS_ACL)
2422 acl = &result->acl_access;
2423 aclcnt = NULL;
2424 if (result->mask & NFS_ACLCNT)
2425 aclcnt = &result->acl_access_count;
2426 error = nfsacl_decode(xdr->buf, hdrlen, aclcnt, acl);
2427 if (unlikely(error <= 0))
2428 goto out;
2429
2430 acl = NULL;
2431 if (result->mask & NFS_DFACL)
2432 acl = &result->acl_default;
2433 aclcnt = NULL;
2434 if (result->mask & NFS_DFACLCNT)
2435 aclcnt = &result->acl_default_count;
2436 error = nfsacl_decode(xdr->buf, hdrlen + error, aclcnt, acl);
2437 if (unlikely(error <= 0))
2438 return error;
2439 error = 0;
2440 out:
2441 return error;
2442 }
2443
2444 static int nfs3_xdr_dec_getacl3res(struct rpc_rqst *req,
2445 struct xdr_stream *xdr,
2446 void *result)
2447 {
2448 enum nfs_stat status;
2449 int error;
2450
2451 error = decode_nfsstat3(xdr, &status);
2452 if (unlikely(error))
2453 goto out;
2454 if (status != NFS3_OK)
2455 goto out_default;
2456 error = decode_getacl3resok(xdr, result);
2457 out:
2458 return error;
2459 out_default:
2460 return nfs3_stat_to_errno(status);
2461 }
2462
2463 static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req,
2464 struct xdr_stream *xdr,
2465 void *result)
2466 {
2467 enum nfs_stat status;
2468 int error;
2469
2470 error = decode_nfsstat3(xdr, &status);
2471 if (unlikely(error))
2472 goto out;
2473 if (status != NFS3_OK)
2474 goto out_default;
2475 error = decode_post_op_attr(xdr, result);
2476 out:
2477 return error;
2478 out_default:
2479 return nfs3_stat_to_errno(status);
2480 }
2481
2482 #endif /* CONFIG_NFS_V3_ACL */
2483
2484
2485 /*
2486 * We need to translate between nfs status return values and
2487 * the local errno values which may not be the same.
2488 */
2489 static const struct {
2490 int stat;
2491 int errno;
2492 } nfs_errtbl[] = {
2493 { NFS_OK, 0 },
2494 { NFSERR_PERM, -EPERM },
2495 { NFSERR_NOENT, -ENOENT },
2496 { NFSERR_IO, -errno_NFSERR_IO},
2497 { NFSERR_NXIO, -ENXIO },
2498 /* { NFSERR_EAGAIN, -EAGAIN }, */
2499 { NFSERR_ACCES, -EACCES },
2500 { NFSERR_EXIST, -EEXIST },
2501 { NFSERR_XDEV, -EXDEV },
2502 { NFSERR_NODEV, -ENODEV },
2503 { NFSERR_NOTDIR, -ENOTDIR },
2504 { NFSERR_ISDIR, -EISDIR },
2505 { NFSERR_INVAL, -EINVAL },
2506 { NFSERR_FBIG, -EFBIG },
2507 { NFSERR_NOSPC, -ENOSPC },
2508 { NFSERR_ROFS, -EROFS },
2509 { NFSERR_MLINK, -EMLINK },
2510 { NFSERR_NAMETOOLONG, -ENAMETOOLONG },
2511 { NFSERR_NOTEMPTY, -ENOTEMPTY },
2512 { NFSERR_DQUOT, -EDQUOT },
2513 { NFSERR_STALE, -ESTALE },
2514 { NFSERR_REMOTE, -EREMOTE },
2515 #ifdef EWFLUSH
2516 { NFSERR_WFLUSH, -EWFLUSH },
2517 #endif
2518 { NFSERR_BADHANDLE, -EBADHANDLE },
2519 { NFSERR_NOT_SYNC, -ENOTSYNC },
2520 { NFSERR_BAD_COOKIE, -EBADCOOKIE },
2521 { NFSERR_NOTSUPP, -ENOTSUPP },
2522 { NFSERR_TOOSMALL, -ETOOSMALL },
2523 { NFSERR_SERVERFAULT, -EREMOTEIO },
2524 { NFSERR_BADTYPE, -EBADTYPE },
2525 { NFSERR_JUKEBOX, -EJUKEBOX },
2526 { -1, -EIO }
2527 };
2528
2529 /**
2530 * nfs3_stat_to_errno - convert an NFS status code to a local errno
2531 * @status: NFS status code to convert
2532 *
2533 * Returns a local errno value, or -EIO if the NFS status code is
2534 * not recognized. This function is used jointly by NFSv2 and NFSv3.
2535 */
2536 static int nfs3_stat_to_errno(enum nfs_stat status)
2537 {
2538 int i;
2539
2540 for (i = 0; nfs_errtbl[i].stat != -1; i++) {
2541 if (nfs_errtbl[i].stat == (int)status)
2542 return nfs_errtbl[i].errno;
2543 }
2544 dprintk("NFS: Unrecognized nfs status value: %u\n", status);
2545 return nfs_errtbl[i].errno;
2546 }
2547
2548
2549 #define PROC(proc, argtype, restype, timer) \
2550 [NFS3PROC_##proc] = { \
2551 .p_proc = NFS3PROC_##proc, \
2552 .p_encode = nfs3_xdr_enc_##argtype##3args, \
2553 .p_decode = nfs3_xdr_dec_##restype##3res, \
2554 .p_arglen = NFS3_##argtype##args_sz, \
2555 .p_replen = NFS3_##restype##res_sz, \
2556 .p_timer = timer, \
2557 .p_statidx = NFS3PROC_##proc, \
2558 .p_name = #proc, \
2559 }
2560
2561 const struct rpc_procinfo nfs3_procedures[] = {
2562 PROC(GETATTR, getattr, getattr, 1),
2563 PROC(SETATTR, setattr, setattr, 0),
2564 PROC(LOOKUP, lookup, lookup, 2),
2565 PROC(ACCESS, access, access, 1),
2566 PROC(READLINK, readlink, readlink, 3),
2567 PROC(READ, read, read, 3),
2568 PROC(WRITE, write, write, 4),
2569 PROC(CREATE, create, create, 0),
2570 PROC(MKDIR, mkdir, create, 0),
2571 PROC(SYMLINK, symlink, create, 0),
2572 PROC(MKNOD, mknod, create, 0),
2573 PROC(REMOVE, remove, remove, 0),
2574 PROC(RMDIR, lookup, setattr, 0),
2575 PROC(RENAME, rename, rename, 0),
2576 PROC(LINK, link, link, 0),
2577 PROC(READDIR, readdir, readdir, 3),
2578 PROC(READDIRPLUS, readdirplus, readdir, 3),
2579 PROC(FSSTAT, getattr, fsstat, 0),
2580 PROC(FSINFO, getattr, fsinfo, 0),
2581 PROC(PATHCONF, getattr, pathconf, 0),
2582 PROC(COMMIT, commit, commit, 5),
2583 };
2584
2585 static unsigned int nfs_version3_counts[ARRAY_SIZE(nfs3_procedures)];
2586 const struct rpc_version nfs_version3 = {
2587 .number = 3,
2588 .nrprocs = ARRAY_SIZE(nfs3_procedures),
2589 .procs = nfs3_procedures,
2590 .counts = nfs_version3_counts,
2591 };
2592
2593 #ifdef CONFIG_NFS_V3_ACL
2594 static const struct rpc_procinfo nfs3_acl_procedures[] = {
2595 [ACLPROC3_GETACL] = {
2596 .p_proc = ACLPROC3_GETACL,
2597 .p_encode = nfs3_xdr_enc_getacl3args,
2598 .p_decode = nfs3_xdr_dec_getacl3res,
2599 .p_arglen = ACL3_getaclargs_sz,
2600 .p_replen = ACL3_getaclres_sz,
2601 .p_timer = 1,
2602 .p_name = "GETACL",
2603 },
2604 [ACLPROC3_SETACL] = {
2605 .p_proc = ACLPROC3_SETACL,
2606 .p_encode = nfs3_xdr_enc_setacl3args,
2607 .p_decode = nfs3_xdr_dec_setacl3res,
2608 .p_arglen = ACL3_setaclargs_sz,
2609 .p_replen = ACL3_setaclres_sz,
2610 .p_timer = 0,
2611 .p_name = "SETACL",
2612 },
2613 };
2614
2615 static unsigned int nfs3_acl_counts[ARRAY_SIZE(nfs3_acl_procedures)];
2616 const struct rpc_version nfsacl_version3 = {
2617 .number = 3,
2618 .nrprocs = ARRAY_SIZE(nfs3_acl_procedures),
2619 .procs = nfs3_acl_procedures,
2620 .counts = nfs3_acl_counts,
2621 };
2622 #endif /* CONFIG_NFS_V3_ACL */
Linux with added FPC-III support