1 /*
2 * linux/fs/nfs/nfs3xdr.c
3 *
4 * XDR functions to encode/decode NFSv3 RPC arguments and results.
5 *
6 * Copyright (C) 1996, 1997 Olaf Kirch
7 */
8
9 #include <linux/param.h>
10 #include <linux/time.h>
11 #include <linux/mm.h>
12 #include <linux/errno.h>
13 #include <linux/string.h>
14 #include <linux/in.h>
15 #include <linux/pagemap.h>
16 #include <linux/proc_fs.h>
17 #include <linux/kdev_t.h>
18 #include <linux/sunrpc/clnt.h>
19 #include <linux/nfs.h>
20 #include <linux/nfs3.h>
21 #include <linux/nfs_fs.h>
22 #include <linux/nfsacl.h>
23 #include "internal.h"
24
25 #define NFSDBG_FACILITY NFSDBG_XDR
26
27 /* Mapping from NFS error code to "errno" error code. */
28 #define errno_NFSERR_IO EIO
29
30 /*
31 * Declare the space requirements for NFS arguments and replies as
32 * number of 32bit-words
33 */
34 #define NFS3_fhandle_sz (1+16)
35 #define NFS3_fh_sz (NFS3_fhandle_sz) /* shorthand */
36 #define NFS3_post_op_fh_sz (1+NFS3_fh_sz)
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_post_op_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 */
prepare_reply_buffer(struct rpc_rqst * req,struct page ** pages,unsigned int base,unsigned int len,unsigned int bufsize)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 */
print_overflow_msg(const char * func,const struct xdr_stream * xdr)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
encode_uint32(struct xdr_stream * xdr,u32 value)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
decode_uint32(struct xdr_stream * xdr,u32 * value)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
decode_uint64(struct xdr_stream * xdr,u64 * value)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 */
xdr_decode_fileid3(__be32 * p,u64 * fileid)182 static __be32 *xdr_decode_fileid3(__be32 *p, u64 *fileid)
183 {
184 return xdr_decode_hyper(p, fileid);
185 }
186
decode_fileid3(struct xdr_stream * xdr,u64 * fileid)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 */
encode_filename3(struct xdr_stream * xdr,const char * name,u32 length)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
decode_inline_filename3(struct xdr_stream * xdr,const char ** name,u32 * length)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 */
encode_nfspath3(struct xdr_stream * xdr,struct page ** pages,const u32 length)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
decode_nfspath3(struct xdr_stream * xdr)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 */
xdr_encode_cookie3(__be32 * p,u64 cookie)280 static __be32 *xdr_encode_cookie3(__be32 *p, u64 cookie)
281 {
282 return xdr_encode_hyper(p, cookie);
283 }
284
decode_cookie3(struct xdr_stream * xdr,u64 * cookie)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 */
xdr_encode_cookieverf3(__be32 * p,const __be32 * verifier)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
decode_cookieverf3(struct xdr_stream * xdr,__be32 * verifier)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 */
encode_createverf3(struct xdr_stream * xdr,const __be32 * verifier)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
decode_writeverf3(struct xdr_stream * xdr,struct nfs_write_verifier * verifier)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 */
xdr_decode_size3(__be32 * p,u64 * size)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
decode_nfsstat3(struct xdr_stream * xdr,enum nfs_stat * status)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 */
encode_ftype3(struct xdr_stream * xdr,const u32 type)389 static void encode_ftype3(struct xdr_stream *xdr, const u32 type)
390 {
391 encode_uint32(xdr, type);
392 }
393
xdr_decode_ftype3(__be32 * p,umode_t * mode)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 */
encode_specdata3(struct xdr_stream * xdr,const dev_t rdev)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
xdr_decode_specdata3(__be32 * p,dev_t * rdev)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 */
encode_nfs_fh3(struct xdr_stream * xdr,const struct nfs_fh * fh)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
decode_nfs_fh3(struct xdr_stream * xdr,struct nfs_fh * fh)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
zero_nfs_fh3(struct nfs_fh * fh)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 */
xdr_encode_nfstime3(__be32 * p,const struct timespec * timep)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
xdr_decode_nfstime3(__be32 * p,struct timespec * timep)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 */
encode_sattr3(struct xdr_stream * xdr,const struct iattr * attr)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 */
decode_fattr3(struct xdr_stream * xdr,struct nfs_fattr * fattr)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 */
decode_post_op_attr(struct xdr_stream * xdr,struct nfs_fattr * fattr)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 */
decode_wcc_attr(struct xdr_stream * xdr,struct nfs_fattr * fattr)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 */
decode_pre_op_attr(struct xdr_stream * xdr,struct nfs_fattr * fattr)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
decode_wcc_data(struct xdr_stream * xdr,struct nfs_fattr * fattr)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 */
decode_post_op_fh3(struct xdr_stream * xdr,struct nfs_fh * fh)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 */
encode_diropargs3(struct xdr_stream * xdr,const struct nfs_fh * fh,const char * name,u32 length)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 */
nfs3_xdr_enc_getattr3args(struct rpc_rqst * req,struct xdr_stream * xdr,const struct nfs_fh * fh)848 static void nfs3_xdr_enc_getattr3args(struct rpc_rqst *req,
849 struct xdr_stream *xdr,
850 const struct nfs_fh *fh)
851 {
852 encode_nfs_fh3(xdr, fh);
853 }
854
855 /*
856 * 3.3.2 SETATTR3args
857 *
858 * union sattrguard3 switch (bool check) {
859 * case TRUE:
860 * nfstime3 obj_ctime;
861 * case FALSE:
862 * void;
863 * };
864 *
865 * struct SETATTR3args {
866 * nfs_fh3 object;
867 * sattr3 new_attributes;
868 * sattrguard3 guard;
869 * };
870 */
encode_sattrguard3(struct xdr_stream * xdr,const struct nfs3_sattrargs * args)871 static void encode_sattrguard3(struct xdr_stream *xdr,
872 const struct nfs3_sattrargs *args)
873 {
874 __be32 *p;
875
876 if (args->guard) {
877 p = xdr_reserve_space(xdr, 4 + 8);
878 *p++ = xdr_one;
879 xdr_encode_nfstime3(p, &args->guardtime);
880 } else {
881 p = xdr_reserve_space(xdr, 4);
882 *p = xdr_zero;
883 }
884 }
885
nfs3_xdr_enc_setattr3args(struct rpc_rqst * req,struct xdr_stream * xdr,const struct nfs3_sattrargs * args)886 static void nfs3_xdr_enc_setattr3args(struct rpc_rqst *req,
887 struct xdr_stream *xdr,
888 const struct nfs3_sattrargs *args)
889 {
890 encode_nfs_fh3(xdr, args->fh);
891 encode_sattr3(xdr, args->sattr);
892 encode_sattrguard3(xdr, args);
893 }
894
895 /*
896 * 3.3.3 LOOKUP3args
897 *
898 * struct LOOKUP3args {
899 * diropargs3 what;
900 * };
901 */
nfs3_xdr_enc_lookup3args(struct rpc_rqst * req,struct xdr_stream * xdr,const struct nfs3_diropargs * args)902 static void nfs3_xdr_enc_lookup3args(struct rpc_rqst *req,
903 struct xdr_stream *xdr,
904 const struct nfs3_diropargs *args)
905 {
906 encode_diropargs3(xdr, args->fh, args->name, args->len);
907 }
908
909 /*
910 * 3.3.4 ACCESS3args
911 *
912 * struct ACCESS3args {
913 * nfs_fh3 object;
914 * uint32 access;
915 * };
916 */
encode_access3args(struct xdr_stream * xdr,const struct nfs3_accessargs * args)917 static void encode_access3args(struct xdr_stream *xdr,
918 const struct nfs3_accessargs *args)
919 {
920 encode_nfs_fh3(xdr, args->fh);
921 encode_uint32(xdr, args->access);
922 }
923
nfs3_xdr_enc_access3args(struct rpc_rqst * req,struct xdr_stream * xdr,const struct nfs3_accessargs * args)924 static void nfs3_xdr_enc_access3args(struct rpc_rqst *req,
925 struct xdr_stream *xdr,
926 const struct nfs3_accessargs *args)
927 {
928 encode_access3args(xdr, args);
929 }
930
931 /*
932 * 3.3.5 READLINK3args
933 *
934 * struct READLINK3args {
935 * nfs_fh3 symlink;
936 * };
937 */
nfs3_xdr_enc_readlink3args(struct rpc_rqst * req,struct xdr_stream * xdr,const struct nfs3_readlinkargs * args)938 static void nfs3_xdr_enc_readlink3args(struct rpc_rqst *req,
939 struct xdr_stream *xdr,
940 const struct nfs3_readlinkargs *args)
941 {
942 encode_nfs_fh3(xdr, args->fh);
943 prepare_reply_buffer(req, args->pages, args->pgbase,
944 args->pglen, NFS3_readlinkres_sz);
945 }
946
947 /*
948 * 3.3.6 READ3args
949 *
950 * struct READ3args {
951 * nfs_fh3 file;
952 * offset3 offset;
953 * count3 count;
954 * };
955 */
encode_read3args(struct xdr_stream * xdr,const struct nfs_pgio_args * args)956 static void encode_read3args(struct xdr_stream *xdr,
957 const struct nfs_pgio_args *args)
958 {
959 __be32 *p;
960
961 encode_nfs_fh3(xdr, args->fh);
962
963 p = xdr_reserve_space(xdr, 8 + 4);
964 p = xdr_encode_hyper(p, args->offset);
965 *p = cpu_to_be32(args->count);
966 }
967
nfs3_xdr_enc_read3args(struct rpc_rqst * req,struct xdr_stream * xdr,const struct nfs_pgio_args * args)968 static void nfs3_xdr_enc_read3args(struct rpc_rqst *req,
969 struct xdr_stream *xdr,
970 const struct nfs_pgio_args *args)
971 {
972 encode_read3args(xdr, args);
973 prepare_reply_buffer(req, args->pages, args->pgbase,
974 args->count, NFS3_readres_sz);
975 req->rq_rcv_buf.flags |= XDRBUF_READ;
976 }
977
978 /*
979 * 3.3.7 WRITE3args
980 *
981 * enum stable_how {
982 * UNSTABLE = 0,
983 * DATA_SYNC = 1,
984 * FILE_SYNC = 2
985 * };
986 *
987 * struct WRITE3args {
988 * nfs_fh3 file;
989 * offset3 offset;
990 * count3 count;
991 * stable_how stable;
992 * opaque data<>;
993 * };
994 */
encode_write3args(struct xdr_stream * xdr,const struct nfs_pgio_args * args)995 static void encode_write3args(struct xdr_stream *xdr,
996 const struct nfs_pgio_args *args)
997 {
998 __be32 *p;
999
1000 encode_nfs_fh3(xdr, args->fh);
1001
1002 p = xdr_reserve_space(xdr, 8 + 4 + 4 + 4);
1003 p = xdr_encode_hyper(p, args->offset);
1004 *p++ = cpu_to_be32(args->count);
1005 *p++ = cpu_to_be32(args->stable);
1006 *p = cpu_to_be32(args->count);
1007 xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
1008 }
1009
nfs3_xdr_enc_write3args(struct rpc_rqst * req,struct xdr_stream * xdr,const struct nfs_pgio_args * args)1010 static void nfs3_xdr_enc_write3args(struct rpc_rqst *req,
1011 struct xdr_stream *xdr,
1012 const struct nfs_pgio_args *args)
1013 {
1014 encode_write3args(xdr, args);
1015 xdr->buf->flags |= XDRBUF_WRITE;
1016 }
1017
1018 /*
1019 * 3.3.8 CREATE3args
1020 *
1021 * enum createmode3 {
1022 * UNCHECKED = 0,
1023 * GUARDED = 1,
1024 * EXCLUSIVE = 2
1025 * };
1026 *
1027 * union createhow3 switch (createmode3 mode) {
1028 * case UNCHECKED:
1029 * case GUARDED:
1030 * sattr3 obj_attributes;
1031 * case EXCLUSIVE:
1032 * createverf3 verf;
1033 * };
1034 *
1035 * struct CREATE3args {
1036 * diropargs3 where;
1037 * createhow3 how;
1038 * };
1039 */
encode_createhow3(struct xdr_stream * xdr,const struct nfs3_createargs * args)1040 static void encode_createhow3(struct xdr_stream *xdr,
1041 const struct nfs3_createargs *args)
1042 {
1043 encode_uint32(xdr, args->createmode);
1044 switch (args->createmode) {
1045 case NFS3_CREATE_UNCHECKED:
1046 case NFS3_CREATE_GUARDED:
1047 encode_sattr3(xdr, args->sattr);
1048 break;
1049 case NFS3_CREATE_EXCLUSIVE:
1050 encode_createverf3(xdr, args->verifier);
1051 break;
1052 default:
1053 BUG();
1054 }
1055 }
1056
nfs3_xdr_enc_create3args(struct rpc_rqst * req,struct xdr_stream * xdr,const struct nfs3_createargs * args)1057 static void nfs3_xdr_enc_create3args(struct rpc_rqst *req,
1058 struct xdr_stream *xdr,
1059 const struct nfs3_createargs *args)
1060 {
1061 encode_diropargs3(xdr, args->fh, args->name, args->len);
1062 encode_createhow3(xdr, args);
1063 }
1064
1065 /*
1066 * 3.3.9 MKDIR3args
1067 *
1068 * struct MKDIR3args {
1069 * diropargs3 where;
1070 * sattr3 attributes;
1071 * };
1072 */
nfs3_xdr_enc_mkdir3args(struct rpc_rqst * req,struct xdr_stream * xdr,const struct nfs3_mkdirargs * args)1073 static void nfs3_xdr_enc_mkdir3args(struct rpc_rqst *req,
1074 struct xdr_stream *xdr,
1075 const struct nfs3_mkdirargs *args)
1076 {
1077 encode_diropargs3(xdr, args->fh, args->name, args->len);
1078 encode_sattr3(xdr, args->sattr);
1079 }
1080
1081 /*
1082 * 3.3.10 SYMLINK3args
1083 *
1084 * struct symlinkdata3 {
1085 * sattr3 symlink_attributes;
1086 * nfspath3 symlink_data;
1087 * };
1088 *
1089 * struct SYMLINK3args {
1090 * diropargs3 where;
1091 * symlinkdata3 symlink;
1092 * };
1093 */
encode_symlinkdata3(struct xdr_stream * xdr,const struct nfs3_symlinkargs * args)1094 static void encode_symlinkdata3(struct xdr_stream *xdr,
1095 const struct nfs3_symlinkargs *args)
1096 {
1097 encode_sattr3(xdr, args->sattr);
1098 encode_nfspath3(xdr, args->pages, args->pathlen);
1099 }
1100
nfs3_xdr_enc_symlink3args(struct rpc_rqst * req,struct xdr_stream * xdr,const struct nfs3_symlinkargs * args)1101 static void nfs3_xdr_enc_symlink3args(struct rpc_rqst *req,
1102 struct xdr_stream *xdr,
1103 const struct nfs3_symlinkargs *args)
1104 {
1105 encode_diropargs3(xdr, args->fromfh, args->fromname, args->fromlen);
1106 encode_symlinkdata3(xdr, args);
1107 xdr->buf->flags |= XDRBUF_WRITE;
1108 }
1109
1110 /*
1111 * 3.3.11 MKNOD3args
1112 *
1113 * struct devicedata3 {
1114 * sattr3 dev_attributes;
1115 * specdata3 spec;
1116 * };
1117 *
1118 * union mknoddata3 switch (ftype3 type) {
1119 * case NF3CHR:
1120 * case NF3BLK:
1121 * devicedata3 device;
1122 * case NF3SOCK:
1123 * case NF3FIFO:
1124 * sattr3 pipe_attributes;
1125 * default:
1126 * void;
1127 * };
1128 *
1129 * struct MKNOD3args {
1130 * diropargs3 where;
1131 * mknoddata3 what;
1132 * };
1133 */
encode_devicedata3(struct xdr_stream * xdr,const struct nfs3_mknodargs * args)1134 static void encode_devicedata3(struct xdr_stream *xdr,
1135 const struct nfs3_mknodargs *args)
1136 {
1137 encode_sattr3(xdr, args->sattr);
1138 encode_specdata3(xdr, args->rdev);
1139 }
1140
encode_mknoddata3(struct xdr_stream * xdr,const struct nfs3_mknodargs * args)1141 static void encode_mknoddata3(struct xdr_stream *xdr,
1142 const struct nfs3_mknodargs *args)
1143 {
1144 encode_ftype3(xdr, args->type);
1145 switch (args->type) {
1146 case NF3CHR:
1147 case NF3BLK:
1148 encode_devicedata3(xdr, args);
1149 break;
1150 case NF3SOCK:
1151 case NF3FIFO:
1152 encode_sattr3(xdr, args->sattr);
1153 break;
1154 case NF3REG:
1155 case NF3DIR:
1156 break;
1157 default:
1158 BUG();
1159 }
1160 }
1161
nfs3_xdr_enc_mknod3args(struct rpc_rqst * req,struct xdr_stream * xdr,const struct nfs3_mknodargs * args)1162 static void nfs3_xdr_enc_mknod3args(struct rpc_rqst *req,
1163 struct xdr_stream *xdr,
1164 const struct nfs3_mknodargs *args)
1165 {
1166 encode_diropargs3(xdr, args->fh, args->name, args->len);
1167 encode_mknoddata3(xdr, args);
1168 }
1169
1170 /*
1171 * 3.3.12 REMOVE3args
1172 *
1173 * struct REMOVE3args {
1174 * diropargs3 object;
1175 * };
1176 */
nfs3_xdr_enc_remove3args(struct rpc_rqst * req,struct xdr_stream * xdr,const struct nfs_removeargs * args)1177 static void nfs3_xdr_enc_remove3args(struct rpc_rqst *req,
1178 struct xdr_stream *xdr,
1179 const struct nfs_removeargs *args)
1180 {
1181 encode_diropargs3(xdr, args->fh, args->name.name, args->name.len);
1182 }
1183
1184 /*
1185 * 3.3.14 RENAME3args
1186 *
1187 * struct RENAME3args {
1188 * diropargs3 from;
1189 * diropargs3 to;
1190 * };
1191 */
nfs3_xdr_enc_rename3args(struct rpc_rqst * req,struct xdr_stream * xdr,const struct nfs_renameargs * args)1192 static void nfs3_xdr_enc_rename3args(struct rpc_rqst *req,
1193 struct xdr_stream *xdr,
1194 const struct nfs_renameargs *args)
1195 {
1196 const struct qstr *old = args->old_name;
1197 const struct qstr *new = args->new_name;
1198
1199 encode_diropargs3(xdr, args->old_dir, old->name, old->len);
1200 encode_diropargs3(xdr, args->new_dir, new->name, new->len);
1201 }
1202
1203 /*
1204 * 3.3.15 LINK3args
1205 *
1206 * struct LINK3args {
1207 * nfs_fh3 file;
1208 * diropargs3 link;
1209 * };
1210 */
nfs3_xdr_enc_link3args(struct rpc_rqst * req,struct xdr_stream * xdr,const struct nfs3_linkargs * args)1211 static void nfs3_xdr_enc_link3args(struct rpc_rqst *req,
1212 struct xdr_stream *xdr,
1213 const struct nfs3_linkargs *args)
1214 {
1215 encode_nfs_fh3(xdr, args->fromfh);
1216 encode_diropargs3(xdr, args->tofh, args->toname, args->tolen);
1217 }
1218
1219 /*
1220 * 3.3.16 READDIR3args
1221 *
1222 * struct READDIR3args {
1223 * nfs_fh3 dir;
1224 * cookie3 cookie;
1225 * cookieverf3 cookieverf;
1226 * count3 count;
1227 * };
1228 */
encode_readdir3args(struct xdr_stream * xdr,const struct nfs3_readdirargs * args)1229 static void encode_readdir3args(struct xdr_stream *xdr,
1230 const struct nfs3_readdirargs *args)
1231 {
1232 __be32 *p;
1233
1234 encode_nfs_fh3(xdr, args->fh);
1235
1236 p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4);
1237 p = xdr_encode_cookie3(p, args->cookie);
1238 p = xdr_encode_cookieverf3(p, args->verf);
1239 *p = cpu_to_be32(args->count);
1240 }
1241
nfs3_xdr_enc_readdir3args(struct rpc_rqst * req,struct xdr_stream * xdr,const struct nfs3_readdirargs * args)1242 static void nfs3_xdr_enc_readdir3args(struct rpc_rqst *req,
1243 struct xdr_stream *xdr,
1244 const struct nfs3_readdirargs *args)
1245 {
1246 encode_readdir3args(xdr, args);
1247 prepare_reply_buffer(req, args->pages, 0,
1248 args->count, NFS3_readdirres_sz);
1249 }
1250
1251 /*
1252 * 3.3.17 READDIRPLUS3args
1253 *
1254 * struct READDIRPLUS3args {
1255 * nfs_fh3 dir;
1256 * cookie3 cookie;
1257 * cookieverf3 cookieverf;
1258 * count3 dircount;
1259 * count3 maxcount;
1260 * };
1261 */
encode_readdirplus3args(struct xdr_stream * xdr,const struct nfs3_readdirargs * args)1262 static void encode_readdirplus3args(struct xdr_stream *xdr,
1263 const struct nfs3_readdirargs *args)
1264 {
1265 __be32 *p;
1266
1267 encode_nfs_fh3(xdr, args->fh);
1268
1269 p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4 + 4);
1270 p = xdr_encode_cookie3(p, args->cookie);
1271 p = xdr_encode_cookieverf3(p, args->verf);
1272
1273 /*
1274 * readdirplus: need dircount + buffer size.
1275 * We just make sure we make dircount big enough
1276 */
1277 *p++ = cpu_to_be32(args->count >> 3);
1278
1279 *p = cpu_to_be32(args->count);
1280 }
1281
nfs3_xdr_enc_readdirplus3args(struct rpc_rqst * req,struct xdr_stream * xdr,const struct nfs3_readdirargs * args)1282 static void nfs3_xdr_enc_readdirplus3args(struct rpc_rqst *req,
1283 struct xdr_stream *xdr,
1284 const struct nfs3_readdirargs *args)
1285 {
1286 encode_readdirplus3args(xdr, args);
1287 prepare_reply_buffer(req, args->pages, 0,
1288 args->count, NFS3_readdirres_sz);
1289 }
1290
1291 /*
1292 * 3.3.21 COMMIT3args
1293 *
1294 * struct COMMIT3args {
1295 * nfs_fh3 file;
1296 * offset3 offset;
1297 * count3 count;
1298 * };
1299 */
encode_commit3args(struct xdr_stream * xdr,const struct nfs_commitargs * args)1300 static void encode_commit3args(struct xdr_stream *xdr,
1301 const struct nfs_commitargs *args)
1302 {
1303 __be32 *p;
1304
1305 encode_nfs_fh3(xdr, args->fh);
1306
1307 p = xdr_reserve_space(xdr, 8 + 4);
1308 p = xdr_encode_hyper(p, args->offset);
1309 *p = cpu_to_be32(args->count);
1310 }
1311
nfs3_xdr_enc_commit3args(struct rpc_rqst * req,struct xdr_stream * xdr,const struct nfs_commitargs * args)1312 static void nfs3_xdr_enc_commit3args(struct rpc_rqst *req,
1313 struct xdr_stream *xdr,
1314 const struct nfs_commitargs *args)
1315 {
1316 encode_commit3args(xdr, args);
1317 }
1318
1319 #ifdef CONFIG_NFS_V3_ACL
1320
nfs3_xdr_enc_getacl3args(struct rpc_rqst * req,struct xdr_stream * xdr,const struct nfs3_getaclargs * args)1321 static void nfs3_xdr_enc_getacl3args(struct rpc_rqst *req,
1322 struct xdr_stream *xdr,
1323 const struct nfs3_getaclargs *args)
1324 {
1325 encode_nfs_fh3(xdr, args->fh);
1326 encode_uint32(xdr, args->mask);
1327 if (args->mask & (NFS_ACL | NFS_DFACL))
1328 prepare_reply_buffer(req, args->pages, 0,
1329 NFSACL_MAXPAGES << PAGE_SHIFT,
1330 ACL3_getaclres_sz);
1331 }
1332
nfs3_xdr_enc_setacl3args(struct rpc_rqst * req,struct xdr_stream * xdr,const struct nfs3_setaclargs * args)1333 static void nfs3_xdr_enc_setacl3args(struct rpc_rqst *req,
1334 struct xdr_stream *xdr,
1335 const struct nfs3_setaclargs *args)
1336 {
1337 unsigned int base;
1338 int error;
1339
1340 encode_nfs_fh3(xdr, NFS_FH(args->inode));
1341 encode_uint32(xdr, args->mask);
1342
1343 base = req->rq_slen;
1344 if (args->npages != 0)
1345 xdr_write_pages(xdr, args->pages, 0, args->len);
1346 else
1347 xdr_reserve_space(xdr, args->len);
1348
1349 error = nfsacl_encode(xdr->buf, base, args->inode,
1350 (args->mask & NFS_ACL) ?
1351 args->acl_access : NULL, 1, 0);
1352 /* FIXME: this is just broken */
1353 BUG_ON(error < 0);
1354 error = nfsacl_encode(xdr->buf, base + error, args->inode,
1355 (args->mask & NFS_DFACL) ?
1356 args->acl_default : NULL, 1,
1357 NFS_ACL_DEFAULT);
1358 BUG_ON(error < 0);
1359 }
1360
1361 #endif /* CONFIG_NFS_V3_ACL */
1362
1363 /*
1364 * NFSv3 XDR decode functions
1365 *
1366 * NFSv3 result types are defined in section 3.3 of RFC 1813:
1367 * "NFS Version 3 Protocol Specification".
1368 */
1369
1370 /*
1371 * 3.3.1 GETATTR3res
1372 *
1373 * struct GETATTR3resok {
1374 * fattr3 obj_attributes;
1375 * };
1376 *
1377 * union GETATTR3res switch (nfsstat3 status) {
1378 * case NFS3_OK:
1379 * GETATTR3resok resok;
1380 * default:
1381 * void;
1382 * };
1383 */
nfs3_xdr_dec_getattr3res(struct rpc_rqst * req,struct xdr_stream * xdr,struct nfs_fattr * result)1384 static int nfs3_xdr_dec_getattr3res(struct rpc_rqst *req,
1385 struct xdr_stream *xdr,
1386 struct nfs_fattr *result)
1387 {
1388 enum nfs_stat status;
1389 int error;
1390
1391 error = decode_nfsstat3(xdr, &status);
1392 if (unlikely(error))
1393 goto out;
1394 if (status != NFS3_OK)
1395 goto out_default;
1396 error = decode_fattr3(xdr, result);
1397 out:
1398 return error;
1399 out_default:
1400 return nfs3_stat_to_errno(status);
1401 }
1402
1403 /*
1404 * 3.3.2 SETATTR3res
1405 *
1406 * struct SETATTR3resok {
1407 * wcc_data obj_wcc;
1408 * };
1409 *
1410 * struct SETATTR3resfail {
1411 * wcc_data obj_wcc;
1412 * };
1413 *
1414 * union SETATTR3res switch (nfsstat3 status) {
1415 * case NFS3_OK:
1416 * SETATTR3resok resok;
1417 * default:
1418 * SETATTR3resfail resfail;
1419 * };
1420 */
nfs3_xdr_dec_setattr3res(struct rpc_rqst * req,struct xdr_stream * xdr,struct nfs_fattr * result)1421 static int nfs3_xdr_dec_setattr3res(struct rpc_rqst *req,
1422 struct xdr_stream *xdr,
1423 struct nfs_fattr *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 error = decode_wcc_data(xdr, result);
1432 if (unlikely(error))
1433 goto out;
1434 if (status != NFS3_OK)
1435 goto out_status;
1436 out:
1437 return error;
1438 out_status:
1439 return nfs3_stat_to_errno(status);
1440 }
1441
1442 /*
1443 * 3.3.3 LOOKUP3res
1444 *
1445 * struct LOOKUP3resok {
1446 * nfs_fh3 object;
1447 * post_op_attr obj_attributes;
1448 * post_op_attr dir_attributes;
1449 * };
1450 *
1451 * struct LOOKUP3resfail {
1452 * post_op_attr dir_attributes;
1453 * };
1454 *
1455 * union LOOKUP3res switch (nfsstat3 status) {
1456 * case NFS3_OK:
1457 * LOOKUP3resok resok;
1458 * default:
1459 * LOOKUP3resfail resfail;
1460 * };
1461 */
nfs3_xdr_dec_lookup3res(struct rpc_rqst * req,struct xdr_stream * xdr,struct nfs3_diropres * result)1462 static int nfs3_xdr_dec_lookup3res(struct rpc_rqst *req,
1463 struct xdr_stream *xdr,
1464 struct nfs3_diropres *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 if (status != NFS3_OK)
1473 goto out_default;
1474 error = decode_nfs_fh3(xdr, result->fh);
1475 if (unlikely(error))
1476 goto out;
1477 error = decode_post_op_attr(xdr, result->fattr);
1478 if (unlikely(error))
1479 goto out;
1480 error = decode_post_op_attr(xdr, result->dir_attr);
1481 out:
1482 return error;
1483 out_default:
1484 error = decode_post_op_attr(xdr, result->dir_attr);
1485 if (unlikely(error))
1486 goto out;
1487 return nfs3_stat_to_errno(status);
1488 }
1489
1490 /*
1491 * 3.3.4 ACCESS3res
1492 *
1493 * struct ACCESS3resok {
1494 * post_op_attr obj_attributes;
1495 * uint32 access;
1496 * };
1497 *
1498 * struct ACCESS3resfail {
1499 * post_op_attr obj_attributes;
1500 * };
1501 *
1502 * union ACCESS3res switch (nfsstat3 status) {
1503 * case NFS3_OK:
1504 * ACCESS3resok resok;
1505 * default:
1506 * ACCESS3resfail resfail;
1507 * };
1508 */
nfs3_xdr_dec_access3res(struct rpc_rqst * req,struct xdr_stream * xdr,struct nfs3_accessres * result)1509 static int nfs3_xdr_dec_access3res(struct rpc_rqst *req,
1510 struct xdr_stream *xdr,
1511 struct nfs3_accessres *result)
1512 {
1513 enum nfs_stat status;
1514 int error;
1515
1516 error = decode_nfsstat3(xdr, &status);
1517 if (unlikely(error))
1518 goto out;
1519 error = decode_post_op_attr(xdr, result->fattr);
1520 if (unlikely(error))
1521 goto out;
1522 if (status != NFS3_OK)
1523 goto out_default;
1524 error = decode_uint32(xdr, &result->access);
1525 out:
1526 return error;
1527 out_default:
1528 return nfs3_stat_to_errno(status);
1529 }
1530
1531 /*
1532 * 3.3.5 READLINK3res
1533 *
1534 * struct READLINK3resok {
1535 * post_op_attr symlink_attributes;
1536 * nfspath3 data;
1537 * };
1538 *
1539 * struct READLINK3resfail {
1540 * post_op_attr symlink_attributes;
1541 * };
1542 *
1543 * union READLINK3res switch (nfsstat3 status) {
1544 * case NFS3_OK:
1545 * READLINK3resok resok;
1546 * default:
1547 * READLINK3resfail resfail;
1548 * };
1549 */
nfs3_xdr_dec_readlink3res(struct rpc_rqst * req,struct xdr_stream * xdr,struct nfs_fattr * result)1550 static int nfs3_xdr_dec_readlink3res(struct rpc_rqst *req,
1551 struct xdr_stream *xdr,
1552 struct nfs_fattr *result)
1553 {
1554 enum nfs_stat status;
1555 int error;
1556
1557 error = decode_nfsstat3(xdr, &status);
1558 if (unlikely(error))
1559 goto out;
1560 error = decode_post_op_attr(xdr, result);
1561 if (unlikely(error))
1562 goto out;
1563 if (status != NFS3_OK)
1564 goto out_default;
1565 error = decode_nfspath3(xdr);
1566 out:
1567 return error;
1568 out_default:
1569 return nfs3_stat_to_errno(status);
1570 }
1571
1572 /*
1573 * 3.3.6 READ3res
1574 *
1575 * struct READ3resok {
1576 * post_op_attr file_attributes;
1577 * count3 count;
1578 * bool eof;
1579 * opaque data<>;
1580 * };
1581 *
1582 * struct READ3resfail {
1583 * post_op_attr file_attributes;
1584 * };
1585 *
1586 * union READ3res switch (nfsstat3 status) {
1587 * case NFS3_OK:
1588 * READ3resok resok;
1589 * default:
1590 * READ3resfail resfail;
1591 * };
1592 */
decode_read3resok(struct xdr_stream * xdr,struct nfs_pgio_res * result)1593 static int decode_read3resok(struct xdr_stream *xdr,
1594 struct nfs_pgio_res *result)
1595 {
1596 u32 eof, count, ocount, recvd;
1597 __be32 *p;
1598
1599 p = xdr_inline_decode(xdr, 4 + 4 + 4);
1600 if (unlikely(p == NULL))
1601 goto out_overflow;
1602 count = be32_to_cpup(p++);
1603 eof = be32_to_cpup(p++);
1604 ocount = be32_to_cpup(p++);
1605 if (unlikely(ocount != count))
1606 goto out_mismatch;
1607 recvd = xdr_read_pages(xdr, count);
1608 if (unlikely(count > recvd))
1609 goto out_cheating;
1610 out:
1611 result->eof = eof;
1612 result->count = count;
1613 return count;
1614 out_mismatch:
1615 dprintk("NFS: READ count doesn't match length of opaque: "
1616 "count %u != ocount %u\n", count, ocount);
1617 return -EIO;
1618 out_cheating:
1619 dprintk("NFS: server cheating in read result: "
1620 "count %u > recvd %u\n", count, recvd);
1621 count = recvd;
1622 eof = 0;
1623 goto out;
1624 out_overflow:
1625 print_overflow_msg(__func__, xdr);
1626 return -EIO;
1627 }
1628
nfs3_xdr_dec_read3res(struct rpc_rqst * req,struct xdr_stream * xdr,struct nfs_pgio_res * result)1629 static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1630 struct nfs_pgio_res *result)
1631 {
1632 enum nfs_stat status;
1633 int error;
1634
1635 error = decode_nfsstat3(xdr, &status);
1636 if (unlikely(error))
1637 goto out;
1638 error = decode_post_op_attr(xdr, result->fattr);
1639 if (unlikely(error))
1640 goto out;
1641 result->op_status = status;
1642 if (status != NFS3_OK)
1643 goto out_status;
1644 error = decode_read3resok(xdr, result);
1645 out:
1646 return error;
1647 out_status:
1648 return nfs3_stat_to_errno(status);
1649 }
1650
1651 /*
1652 * 3.3.7 WRITE3res
1653 *
1654 * enum stable_how {
1655 * UNSTABLE = 0,
1656 * DATA_SYNC = 1,
1657 * FILE_SYNC = 2
1658 * };
1659 *
1660 * struct WRITE3resok {
1661 * wcc_data file_wcc;
1662 * count3 count;
1663 * stable_how committed;
1664 * writeverf3 verf;
1665 * };
1666 *
1667 * struct WRITE3resfail {
1668 * wcc_data file_wcc;
1669 * };
1670 *
1671 * union WRITE3res switch (nfsstat3 status) {
1672 * case NFS3_OK:
1673 * WRITE3resok resok;
1674 * default:
1675 * WRITE3resfail resfail;
1676 * };
1677 */
decode_write3resok(struct xdr_stream * xdr,struct nfs_pgio_res * result)1678 static int decode_write3resok(struct xdr_stream *xdr,
1679 struct nfs_pgio_res *result)
1680 {
1681 __be32 *p;
1682
1683 p = xdr_inline_decode(xdr, 4 + 4);
1684 if (unlikely(p == NULL))
1685 goto out_overflow;
1686 result->count = be32_to_cpup(p++);
1687 result->verf->committed = be32_to_cpup(p++);
1688 if (unlikely(result->verf->committed > NFS_FILE_SYNC))
1689 goto out_badvalue;
1690 if (decode_writeverf3(xdr, &result->verf->verifier))
1691 goto out_eio;
1692 return result->count;
1693 out_badvalue:
1694 dprintk("NFS: bad stable_how value: %u\n", result->verf->committed);
1695 return -EIO;
1696 out_overflow:
1697 print_overflow_msg(__func__, xdr);
1698 out_eio:
1699 return -EIO;
1700 }
1701
nfs3_xdr_dec_write3res(struct rpc_rqst * req,struct xdr_stream * xdr,struct nfs_pgio_res * result)1702 static int nfs3_xdr_dec_write3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1703 struct nfs_pgio_res *result)
1704 {
1705 enum nfs_stat status;
1706 int error;
1707
1708 error = decode_nfsstat3(xdr, &status);
1709 if (unlikely(error))
1710 goto out;
1711 error = decode_wcc_data(xdr, result->fattr);
1712 if (unlikely(error))
1713 goto out;
1714 result->op_status = status;
1715 if (status != NFS3_OK)
1716 goto out_status;
1717 error = decode_write3resok(xdr, result);
1718 out:
1719 return error;
1720 out_status:
1721 return nfs3_stat_to_errno(status);
1722 }
1723
1724 /*
1725 * 3.3.8 CREATE3res
1726 *
1727 * struct CREATE3resok {
1728 * post_op_fh3 obj;
1729 * post_op_attr obj_attributes;
1730 * wcc_data dir_wcc;
1731 * };
1732 *
1733 * struct CREATE3resfail {
1734 * wcc_data dir_wcc;
1735 * };
1736 *
1737 * union CREATE3res switch (nfsstat3 status) {
1738 * case NFS3_OK:
1739 * CREATE3resok resok;
1740 * default:
1741 * CREATE3resfail resfail;
1742 * };
1743 */
decode_create3resok(struct xdr_stream * xdr,struct nfs3_diropres * result)1744 static int decode_create3resok(struct xdr_stream *xdr,
1745 struct nfs3_diropres *result)
1746 {
1747 int error;
1748
1749 error = decode_post_op_fh3(xdr, result->fh);
1750 if (unlikely(error))
1751 goto out;
1752 error = decode_post_op_attr(xdr, result->fattr);
1753 if (unlikely(error))
1754 goto out;
1755 /* The server isn't required to return a file handle.
1756 * If it didn't, force the client to perform a LOOKUP
1757 * to determine the correct file handle and attribute
1758 * values for the new object. */
1759 if (result->fh->size == 0)
1760 result->fattr->valid = 0;
1761 error = decode_wcc_data(xdr, result->dir_attr);
1762 out:
1763 return error;
1764 }
1765
nfs3_xdr_dec_create3res(struct rpc_rqst * req,struct xdr_stream * xdr,struct nfs3_diropres * result)1766 static int nfs3_xdr_dec_create3res(struct rpc_rqst *req,
1767 struct xdr_stream *xdr,
1768 struct nfs3_diropres *result)
1769 {
1770 enum nfs_stat status;
1771 int error;
1772
1773 error = decode_nfsstat3(xdr, &status);
1774 if (unlikely(error))
1775 goto out;
1776 if (status != NFS3_OK)
1777 goto out_default;
1778 error = decode_create3resok(xdr, result);
1779 out:
1780 return error;
1781 out_default:
1782 error = decode_wcc_data(xdr, result->dir_attr);
1783 if (unlikely(error))
1784 goto out;
1785 return nfs3_stat_to_errno(status);
1786 }
1787
1788 /*
1789 * 3.3.12 REMOVE3res
1790 *
1791 * struct REMOVE3resok {
1792 * wcc_data dir_wcc;
1793 * };
1794 *
1795 * struct REMOVE3resfail {
1796 * wcc_data dir_wcc;
1797 * };
1798 *
1799 * union REMOVE3res switch (nfsstat3 status) {
1800 * case NFS3_OK:
1801 * REMOVE3resok resok;
1802 * default:
1803 * REMOVE3resfail resfail;
1804 * };
1805 */
nfs3_xdr_dec_remove3res(struct rpc_rqst * req,struct xdr_stream * xdr,struct nfs_removeres * result)1806 static int nfs3_xdr_dec_remove3res(struct rpc_rqst *req,
1807 struct xdr_stream *xdr,
1808 struct nfs_removeres *result)
1809 {
1810 enum nfs_stat status;
1811 int error;
1812
1813 error = decode_nfsstat3(xdr, &status);
1814 if (unlikely(error))
1815 goto out;
1816 error = decode_wcc_data(xdr, result->dir_attr);
1817 if (unlikely(error))
1818 goto out;
1819 if (status != NFS3_OK)
1820 goto out_status;
1821 out:
1822 return error;
1823 out_status:
1824 return nfs3_stat_to_errno(status);
1825 }
1826
1827 /*
1828 * 3.3.14 RENAME3res
1829 *
1830 * struct RENAME3resok {
1831 * wcc_data fromdir_wcc;
1832 * wcc_data todir_wcc;
1833 * };
1834 *
1835 * struct RENAME3resfail {
1836 * wcc_data fromdir_wcc;
1837 * wcc_data todir_wcc;
1838 * };
1839 *
1840 * union RENAME3res switch (nfsstat3 status) {
1841 * case NFS3_OK:
1842 * RENAME3resok resok;
1843 * default:
1844 * RENAME3resfail resfail;
1845 * };
1846 */
nfs3_xdr_dec_rename3res(struct rpc_rqst * req,struct xdr_stream * xdr,struct nfs_renameres * result)1847 static int nfs3_xdr_dec_rename3res(struct rpc_rqst *req,
1848 struct xdr_stream *xdr,
1849 struct nfs_renameres *result)
1850 {
1851 enum nfs_stat status;
1852 int error;
1853
1854 error = decode_nfsstat3(xdr, &status);
1855 if (unlikely(error))
1856 goto out;
1857 error = decode_wcc_data(xdr, result->old_fattr);
1858 if (unlikely(error))
1859 goto out;
1860 error = decode_wcc_data(xdr, result->new_fattr);
1861 if (unlikely(error))
1862 goto out;
1863 if (status != NFS3_OK)
1864 goto out_status;
1865 out:
1866 return error;
1867 out_status:
1868 return nfs3_stat_to_errno(status);
1869 }
1870
1871 /*
1872 * 3.3.15 LINK3res
1873 *
1874 * struct LINK3resok {
1875 * post_op_attr file_attributes;
1876 * wcc_data linkdir_wcc;
1877 * };
1878 *
1879 * struct LINK3resfail {
1880 * post_op_attr file_attributes;
1881 * wcc_data linkdir_wcc;
1882 * };
1883 *
1884 * union LINK3res switch (nfsstat3 status) {
1885 * case NFS3_OK:
1886 * LINK3resok resok;
1887 * default:
1888 * LINK3resfail resfail;
1889 * };
1890 */
nfs3_xdr_dec_link3res(struct rpc_rqst * req,struct xdr_stream * xdr,struct nfs3_linkres * result)1891 static int nfs3_xdr_dec_link3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1892 struct nfs3_linkres *result)
1893 {
1894 enum nfs_stat status;
1895 int error;
1896
1897 error = decode_nfsstat3(xdr, &status);
1898 if (unlikely(error))
1899 goto out;
1900 error = decode_post_op_attr(xdr, result->fattr);
1901 if (unlikely(error))
1902 goto out;
1903 error = decode_wcc_data(xdr, result->dir_attr);
1904 if (unlikely(error))
1905 goto out;
1906 if (status != NFS3_OK)
1907 goto out_status;
1908 out:
1909 return error;
1910 out_status:
1911 return nfs3_stat_to_errno(status);
1912 }
1913
1914 /**
1915 * nfs3_decode_dirent - Decode a single NFSv3 directory entry stored in
1916 * the local page cache
1917 * @xdr: XDR stream where entry resides
1918 * @entry: buffer to fill in with entry data
1919 * @plus: boolean indicating whether this should be a readdirplus entry
1920 *
1921 * Returns zero if successful, otherwise a negative errno value is
1922 * returned.
1923 *
1924 * This function is not invoked during READDIR reply decoding, but
1925 * rather whenever an application invokes the getdents(2) system call
1926 * on a directory already in our cache.
1927 *
1928 * 3.3.16 entry3
1929 *
1930 * struct entry3 {
1931 * fileid3 fileid;
1932 * filename3 name;
1933 * cookie3 cookie;
1934 * fhandle3 filehandle;
1935 * post_op_attr3 attributes;
1936 * entry3 *nextentry;
1937 * };
1938 *
1939 * 3.3.17 entryplus3
1940 * struct entryplus3 {
1941 * fileid3 fileid;
1942 * filename3 name;
1943 * cookie3 cookie;
1944 * post_op_attr name_attributes;
1945 * post_op_fh3 name_handle;
1946 * entryplus3 *nextentry;
1947 * };
1948 */
nfs3_decode_dirent(struct xdr_stream * xdr,struct nfs_entry * entry,int plus)1949 int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
1950 int plus)
1951 {
1952 struct nfs_entry old = *entry;
1953 __be32 *p;
1954 int error;
1955
1956 p = xdr_inline_decode(xdr, 4);
1957 if (unlikely(p == NULL))
1958 goto out_overflow;
1959 if (*p == xdr_zero) {
1960 p = xdr_inline_decode(xdr, 4);
1961 if (unlikely(p == NULL))
1962 goto out_overflow;
1963 if (*p == xdr_zero)
1964 return -EAGAIN;
1965 entry->eof = 1;
1966 return -EBADCOOKIE;
1967 }
1968
1969 error = decode_fileid3(xdr, &entry->ino);
1970 if (unlikely(error))
1971 return error;
1972
1973 error = decode_inline_filename3(xdr, &entry->name, &entry->len);
1974 if (unlikely(error))
1975 return error;
1976
1977 entry->prev_cookie = entry->cookie;
1978 error = decode_cookie3(xdr, &entry->cookie);
1979 if (unlikely(error))
1980 return error;
1981
1982 entry->d_type = DT_UNKNOWN;
1983
1984 if (plus) {
1985 entry->fattr->valid = 0;
1986 error = decode_post_op_attr(xdr, entry->fattr);
1987 if (unlikely(error))
1988 return error;
1989 if (entry->fattr->valid & NFS_ATTR_FATTR_V3)
1990 entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);
1991
1992 if (entry->fattr->fileid != entry->ino) {
1993 entry->fattr->mounted_on_fileid = entry->ino;
1994 entry->fattr->valid |= NFS_ATTR_FATTR_MOUNTED_ON_FILEID;
1995 }
1996
1997 /* In fact, a post_op_fh3: */
1998 p = xdr_inline_decode(xdr, 4);
1999 if (unlikely(p == NULL))
2000 goto out_overflow;
2001 if (*p != xdr_zero) {
2002 error = decode_nfs_fh3(xdr, entry->fh);
2003 if (unlikely(error)) {
2004 if (error == -E2BIG)
2005 goto out_truncated;
2006 return error;
2007 }
2008 } else
2009 zero_nfs_fh3(entry->fh);
2010 }
2011
2012 return 0;
2013
2014 out_overflow:
2015 print_overflow_msg(__func__, xdr);
2016 return -EAGAIN;
2017 out_truncated:
2018 dprintk("NFS: directory entry contains invalid file handle\n");
2019 *entry = old;
2020 return -EAGAIN;
2021 }
2022
2023 /*
2024 * 3.3.16 READDIR3res
2025 *
2026 * struct dirlist3 {
2027 * entry3 *entries;
2028 * bool eof;
2029 * };
2030 *
2031 * struct READDIR3resok {
2032 * post_op_attr dir_attributes;
2033 * cookieverf3 cookieverf;
2034 * dirlist3 reply;
2035 * };
2036 *
2037 * struct READDIR3resfail {
2038 * post_op_attr dir_attributes;
2039 * };
2040 *
2041 * union READDIR3res switch (nfsstat3 status) {
2042 * case NFS3_OK:
2043 * READDIR3resok resok;
2044 * default:
2045 * READDIR3resfail resfail;
2046 * };
2047 *
2048 * Read the directory contents into the page cache, but otherwise
2049 * don't touch them. The actual decoding is done by nfs3_decode_entry()
2050 * during subsequent nfs_readdir() calls.
2051 */
decode_dirlist3(struct xdr_stream * xdr)2052 static int decode_dirlist3(struct xdr_stream *xdr)
2053 {
2054 return xdr_read_pages(xdr, xdr->buf->page_len);
2055 }
2056
decode_readdir3resok(struct xdr_stream * xdr,struct nfs3_readdirres * result)2057 static int decode_readdir3resok(struct xdr_stream *xdr,
2058 struct nfs3_readdirres *result)
2059 {
2060 int error;
2061
2062 error = decode_post_op_attr(xdr, result->dir_attr);
2063 if (unlikely(error))
2064 goto out;
2065 /* XXX: do we need to check if result->verf != NULL ? */
2066 error = decode_cookieverf3(xdr, result->verf);
2067 if (unlikely(error))
2068 goto out;
2069 error = decode_dirlist3(xdr);
2070 out:
2071 return error;
2072 }
2073
nfs3_xdr_dec_readdir3res(struct rpc_rqst * req,struct xdr_stream * xdr,struct nfs3_readdirres * result)2074 static int nfs3_xdr_dec_readdir3res(struct rpc_rqst *req,
2075 struct xdr_stream *xdr,
2076 struct nfs3_readdirres *result)
2077 {
2078 enum nfs_stat status;
2079 int error;
2080
2081 error = decode_nfsstat3(xdr, &status);
2082 if (unlikely(error))
2083 goto out;
2084 if (status != NFS3_OK)
2085 goto out_default;
2086 error = decode_readdir3resok(xdr, result);
2087 out:
2088 return error;
2089 out_default:
2090 error = decode_post_op_attr(xdr, result->dir_attr);
2091 if (unlikely(error))
2092 goto out;
2093 return nfs3_stat_to_errno(status);
2094 }
2095
2096 /*
2097 * 3.3.18 FSSTAT3res
2098 *
2099 * struct FSSTAT3resok {
2100 * post_op_attr obj_attributes;
2101 * size3 tbytes;
2102 * size3 fbytes;
2103 * size3 abytes;
2104 * size3 tfiles;
2105 * size3 ffiles;
2106 * size3 afiles;
2107 * uint32 invarsec;
2108 * };
2109 *
2110 * struct FSSTAT3resfail {
2111 * post_op_attr obj_attributes;
2112 * };
2113 *
2114 * union FSSTAT3res switch (nfsstat3 status) {
2115 * case NFS3_OK:
2116 * FSSTAT3resok resok;
2117 * default:
2118 * FSSTAT3resfail resfail;
2119 * };
2120 */
decode_fsstat3resok(struct xdr_stream * xdr,struct nfs_fsstat * result)2121 static int decode_fsstat3resok(struct xdr_stream *xdr,
2122 struct nfs_fsstat *result)
2123 {
2124 __be32 *p;
2125
2126 p = xdr_inline_decode(xdr, 8 * 6 + 4);
2127 if (unlikely(p == NULL))
2128 goto out_overflow;
2129 p = xdr_decode_size3(p, &result->tbytes);
2130 p = xdr_decode_size3(p, &result->fbytes);
2131 p = xdr_decode_size3(p, &result->abytes);
2132 p = xdr_decode_size3(p, &result->tfiles);
2133 p = xdr_decode_size3(p, &result->ffiles);
2134 xdr_decode_size3(p, &result->afiles);
2135 /* ignore invarsec */
2136 return 0;
2137 out_overflow:
2138 print_overflow_msg(__func__, xdr);
2139 return -EIO;
2140 }
2141
nfs3_xdr_dec_fsstat3res(struct rpc_rqst * req,struct xdr_stream * xdr,struct nfs_fsstat * result)2142 static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req,
2143 struct xdr_stream *xdr,
2144 struct nfs_fsstat *result)
2145 {
2146 enum nfs_stat status;
2147 int error;
2148
2149 error = decode_nfsstat3(xdr, &status);
2150 if (unlikely(error))
2151 goto out;
2152 error = decode_post_op_attr(xdr, result->fattr);
2153 if (unlikely(error))
2154 goto out;
2155 if (status != NFS3_OK)
2156 goto out_status;
2157 error = decode_fsstat3resok(xdr, result);
2158 out:
2159 return error;
2160 out_status:
2161 return nfs3_stat_to_errno(status);
2162 }
2163
2164 /*
2165 * 3.3.19 FSINFO3res
2166 *
2167 * struct FSINFO3resok {
2168 * post_op_attr obj_attributes;
2169 * uint32 rtmax;
2170 * uint32 rtpref;
2171 * uint32 rtmult;
2172 * uint32 wtmax;
2173 * uint32 wtpref;
2174 * uint32 wtmult;
2175 * uint32 dtpref;
2176 * size3 maxfilesize;
2177 * nfstime3 time_delta;
2178 * uint32 properties;
2179 * };
2180 *
2181 * struct FSINFO3resfail {
2182 * post_op_attr obj_attributes;
2183 * };
2184 *
2185 * union FSINFO3res switch (nfsstat3 status) {
2186 * case NFS3_OK:
2187 * FSINFO3resok resok;
2188 * default:
2189 * FSINFO3resfail resfail;
2190 * };
2191 */
decode_fsinfo3resok(struct xdr_stream * xdr,struct nfs_fsinfo * result)2192 static int decode_fsinfo3resok(struct xdr_stream *xdr,
2193 struct nfs_fsinfo *result)
2194 {
2195 __be32 *p;
2196
2197 p = xdr_inline_decode(xdr, 4 * 7 + 8 + 8 + 4);
2198 if (unlikely(p == NULL))
2199 goto out_overflow;
2200 result->rtmax = be32_to_cpup(p++);
2201 result->rtpref = be32_to_cpup(p++);
2202 result->rtmult = be32_to_cpup(p++);
2203 result->wtmax = be32_to_cpup(p++);
2204 result->wtpref = be32_to_cpup(p++);
2205 result->wtmult = be32_to_cpup(p++);
2206 result->dtpref = be32_to_cpup(p++);
2207 p = xdr_decode_size3(p, &result->maxfilesize);
2208 xdr_decode_nfstime3(p, &result->time_delta);
2209
2210 /* ignore properties */
2211 result->lease_time = 0;
2212 return 0;
2213 out_overflow:
2214 print_overflow_msg(__func__, xdr);
2215 return -EIO;
2216 }
2217
nfs3_xdr_dec_fsinfo3res(struct rpc_rqst * req,struct xdr_stream * xdr,struct nfs_fsinfo * result)2218 static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req,
2219 struct xdr_stream *xdr,
2220 struct nfs_fsinfo *result)
2221 {
2222 enum nfs_stat status;
2223 int error;
2224
2225 error = decode_nfsstat3(xdr, &status);
2226 if (unlikely(error))
2227 goto out;
2228 error = decode_post_op_attr(xdr, result->fattr);
2229 if (unlikely(error))
2230 goto out;
2231 if (status != NFS3_OK)
2232 goto out_status;
2233 error = decode_fsinfo3resok(xdr, result);
2234 out:
2235 return error;
2236 out_status:
2237 return nfs3_stat_to_errno(status);
2238 }
2239
2240 /*
2241 * 3.3.20 PATHCONF3res
2242 *
2243 * struct PATHCONF3resok {
2244 * post_op_attr obj_attributes;
2245 * uint32 linkmax;
2246 * uint32 name_max;
2247 * bool no_trunc;
2248 * bool chown_restricted;
2249 * bool case_insensitive;
2250 * bool case_preserving;
2251 * };
2252 *
2253 * struct PATHCONF3resfail {
2254 * post_op_attr obj_attributes;
2255 * };
2256 *
2257 * union PATHCONF3res switch (nfsstat3 status) {
2258 * case NFS3_OK:
2259 * PATHCONF3resok resok;
2260 * default:
2261 * PATHCONF3resfail resfail;
2262 * };
2263 */
decode_pathconf3resok(struct xdr_stream * xdr,struct nfs_pathconf * result)2264 static int decode_pathconf3resok(struct xdr_stream *xdr,
2265 struct nfs_pathconf *result)
2266 {
2267 __be32 *p;
2268
2269 p = xdr_inline_decode(xdr, 4 * 6);
2270 if (unlikely(p == NULL))
2271 goto out_overflow;
2272 result->max_link = be32_to_cpup(p++);
2273 result->max_namelen = be32_to_cpup(p);
2274 /* ignore remaining fields */
2275 return 0;
2276 out_overflow:
2277 print_overflow_msg(__func__, xdr);
2278 return -EIO;
2279 }
2280
nfs3_xdr_dec_pathconf3res(struct rpc_rqst * req,struct xdr_stream * xdr,struct nfs_pathconf * result)2281 static int nfs3_xdr_dec_pathconf3res(struct rpc_rqst *req,
2282 struct xdr_stream *xdr,
2283 struct nfs_pathconf *result)
2284 {
2285 enum nfs_stat status;
2286 int error;
2287
2288 error = decode_nfsstat3(xdr, &status);
2289 if (unlikely(error))
2290 goto out;
2291 error = decode_post_op_attr(xdr, result->fattr);
2292 if (unlikely(error))
2293 goto out;
2294 if (status != NFS3_OK)
2295 goto out_status;
2296 error = decode_pathconf3resok(xdr, result);
2297 out:
2298 return error;
2299 out_status:
2300 return nfs3_stat_to_errno(status);
2301 }
2302
2303 /*
2304 * 3.3.21 COMMIT3res
2305 *
2306 * struct COMMIT3resok {
2307 * wcc_data file_wcc;
2308 * writeverf3 verf;
2309 * };
2310 *
2311 * struct COMMIT3resfail {
2312 * wcc_data file_wcc;
2313 * };
2314 *
2315 * union COMMIT3res switch (nfsstat3 status) {
2316 * case NFS3_OK:
2317 * COMMIT3resok resok;
2318 * default:
2319 * COMMIT3resfail resfail;
2320 * };
2321 */
nfs3_xdr_dec_commit3res(struct rpc_rqst * req,struct xdr_stream * xdr,struct nfs_commitres * result)2322 static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req,
2323 struct xdr_stream *xdr,
2324 struct nfs_commitres *result)
2325 {
2326 enum nfs_stat status;
2327 int error;
2328
2329 error = decode_nfsstat3(xdr, &status);
2330 if (unlikely(error))
2331 goto out;
2332 error = decode_wcc_data(xdr, result->fattr);
2333 if (unlikely(error))
2334 goto out;
2335 result->op_status = status;
2336 if (status != NFS3_OK)
2337 goto out_status;
2338 error = decode_writeverf3(xdr, &result->verf->verifier);
2339 out:
2340 return error;
2341 out_status:
2342 return nfs3_stat_to_errno(status);
2343 }
2344
2345 #ifdef CONFIG_NFS_V3_ACL
2346
decode_getacl3resok(struct xdr_stream * xdr,struct nfs3_getaclres * result)2347 static inline int decode_getacl3resok(struct xdr_stream *xdr,
2348 struct nfs3_getaclres *result)
2349 {
2350 struct posix_acl **acl;
2351 unsigned int *aclcnt;
2352 size_t hdrlen;
2353 int error;
2354
2355 error = decode_post_op_attr(xdr, result->fattr);
2356 if (unlikely(error))
2357 goto out;
2358 error = decode_uint32(xdr, &result->mask);
2359 if (unlikely(error))
2360 goto out;
2361 error = -EINVAL;
2362 if (result->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
2363 goto out;
2364
2365 hdrlen = xdr_stream_pos(xdr);
2366
2367 acl = NULL;
2368 if (result->mask & NFS_ACL)
2369 acl = &result->acl_access;
2370 aclcnt = NULL;
2371 if (result->mask & NFS_ACLCNT)
2372 aclcnt = &result->acl_access_count;
2373 error = nfsacl_decode(xdr->buf, hdrlen, aclcnt, acl);
2374 if (unlikely(error <= 0))
2375 goto out;
2376
2377 acl = NULL;
2378 if (result->mask & NFS_DFACL)
2379 acl = &result->acl_default;
2380 aclcnt = NULL;
2381 if (result->mask & NFS_DFACLCNT)
2382 aclcnt = &result->acl_default_count;
2383 error = nfsacl_decode(xdr->buf, hdrlen + error, aclcnt, acl);
2384 if (unlikely(error <= 0))
2385 return error;
2386 error = 0;
2387 out:
2388 return error;
2389 }
2390
nfs3_xdr_dec_getacl3res(struct rpc_rqst * req,struct xdr_stream * xdr,struct nfs3_getaclres * result)2391 static int nfs3_xdr_dec_getacl3res(struct rpc_rqst *req,
2392 struct xdr_stream *xdr,
2393 struct nfs3_getaclres *result)
2394 {
2395 enum nfs_stat status;
2396 int error;
2397
2398 error = decode_nfsstat3(xdr, &status);
2399 if (unlikely(error))
2400 goto out;
2401 if (status != NFS3_OK)
2402 goto out_default;
2403 error = decode_getacl3resok(xdr, result);
2404 out:
2405 return error;
2406 out_default:
2407 return nfs3_stat_to_errno(status);
2408 }
2409
nfs3_xdr_dec_setacl3res(struct rpc_rqst * req,struct xdr_stream * xdr,struct nfs_fattr * result)2410 static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req,
2411 struct xdr_stream *xdr,
2412 struct nfs_fattr *result)
2413 {
2414 enum nfs_stat status;
2415 int error;
2416
2417 error = decode_nfsstat3(xdr, &status);
2418 if (unlikely(error))
2419 goto out;
2420 if (status != NFS3_OK)
2421 goto out_default;
2422 error = decode_post_op_attr(xdr, result);
2423 out:
2424 return error;
2425 out_default:
2426 return nfs3_stat_to_errno(status);
2427 }
2428
2429 #endif /* CONFIG_NFS_V3_ACL */
2430
2431
2432 /*
2433 * We need to translate between nfs status return values and
2434 * the local errno values which may not be the same.
2435 */
2436 static const struct {
2437 int stat;
2438 int errno;
2439 } nfs_errtbl[] = {
2440 { NFS_OK, 0 },
2441 { NFSERR_PERM, -EPERM },
2442 { NFSERR_NOENT, -ENOENT },
2443 { NFSERR_IO, -errno_NFSERR_IO},
2444 { NFSERR_NXIO, -ENXIO },
2445 /* { NFSERR_EAGAIN, -EAGAIN }, */
2446 { NFSERR_ACCES, -EACCES },
2447 { NFSERR_EXIST, -EEXIST },
2448 { NFSERR_XDEV, -EXDEV },
2449 { NFSERR_NODEV, -ENODEV },
2450 { NFSERR_NOTDIR, -ENOTDIR },
2451 { NFSERR_ISDIR, -EISDIR },
2452 { NFSERR_INVAL, -EINVAL },
2453 { NFSERR_FBIG, -EFBIG },
2454 { NFSERR_NOSPC, -ENOSPC },
2455 { NFSERR_ROFS, -EROFS },
2456 { NFSERR_MLINK, -EMLINK },
2457 { NFSERR_NAMETOOLONG, -ENAMETOOLONG },
2458 { NFSERR_NOTEMPTY, -ENOTEMPTY },
2459 { NFSERR_DQUOT, -EDQUOT },
2460 { NFSERR_STALE, -ESTALE },
2461 { NFSERR_REMOTE, -EREMOTE },
2462 #ifdef EWFLUSH
2463 { NFSERR_WFLUSH, -EWFLUSH },
2464 #endif
2465 { NFSERR_BADHANDLE, -EBADHANDLE },
2466 { NFSERR_NOT_SYNC, -ENOTSYNC },
2467 { NFSERR_BAD_COOKIE, -EBADCOOKIE },
2468 { NFSERR_NOTSUPP, -ENOTSUPP },
2469 { NFSERR_TOOSMALL, -ETOOSMALL },
2470 { NFSERR_SERVERFAULT, -EREMOTEIO },
2471 { NFSERR_BADTYPE, -EBADTYPE },
2472 { NFSERR_JUKEBOX, -EJUKEBOX },
2473 { -1, -EIO }
2474 };
2475
2476 /**
2477 * nfs3_stat_to_errno - convert an NFS status code to a local errno
2478 * @status: NFS status code to convert
2479 *
2480 * Returns a local errno value, or -EIO if the NFS status code is
2481 * not recognized. This function is used jointly by NFSv2 and NFSv3.
2482 */
nfs3_stat_to_errno(enum nfs_stat status)2483 static int nfs3_stat_to_errno(enum nfs_stat status)
2484 {
2485 int i;
2486
2487 for (i = 0; nfs_errtbl[i].stat != -1; i++) {
2488 if (nfs_errtbl[i].stat == (int)status)
2489 return nfs_errtbl[i].errno;
2490 }
2491 dprintk("NFS: Unrecognized nfs status value: %u\n", status);
2492 return nfs_errtbl[i].errno;
2493 }
2494
2495
2496 #define PROC(proc, argtype, restype, timer) \
2497 [NFS3PROC_##proc] = { \
2498 .p_proc = NFS3PROC_##proc, \
2499 .p_encode = (kxdreproc_t)nfs3_xdr_enc_##argtype##3args, \
2500 .p_decode = (kxdrdproc_t)nfs3_xdr_dec_##restype##3res, \
2501 .p_arglen = NFS3_##argtype##args_sz, \
2502 .p_replen = NFS3_##restype##res_sz, \
2503 .p_timer = timer, \
2504 .p_statidx = NFS3PROC_##proc, \
2505 .p_name = #proc, \
2506 }
2507
2508 struct rpc_procinfo nfs3_procedures[] = {
2509 PROC(GETATTR, getattr, getattr, 1),
2510 PROC(SETATTR, setattr, setattr, 0),
2511 PROC(LOOKUP, lookup, lookup, 2),
2512 PROC(ACCESS, access, access, 1),
2513 PROC(READLINK, readlink, readlink, 3),
2514 PROC(READ, read, read, 3),
2515 PROC(WRITE, write, write, 4),
2516 PROC(CREATE, create, create, 0),
2517 PROC(MKDIR, mkdir, create, 0),
2518 PROC(SYMLINK, symlink, create, 0),
2519 PROC(MKNOD, mknod, create, 0),
2520 PROC(REMOVE, remove, remove, 0),
2521 PROC(RMDIR, lookup, setattr, 0),
2522 PROC(RENAME, rename, rename, 0),
2523 PROC(LINK, link, link, 0),
2524 PROC(READDIR, readdir, readdir, 3),
2525 PROC(READDIRPLUS, readdirplus, readdir, 3),
2526 PROC(FSSTAT, getattr, fsstat, 0),
2527 PROC(FSINFO, getattr, fsinfo, 0),
2528 PROC(PATHCONF, getattr, pathconf, 0),
2529 PROC(COMMIT, commit, commit, 5),
2530 };
2531
2532 const struct rpc_version nfs_version3 = {
2533 .number = 3,
2534 .nrprocs = ARRAY_SIZE(nfs3_procedures),
2535 .procs = nfs3_procedures
2536 };
2537
2538 #ifdef CONFIG_NFS_V3_ACL
2539 static struct rpc_procinfo nfs3_acl_procedures[] = {
2540 [ACLPROC3_GETACL] = {
2541 .p_proc = ACLPROC3_GETACL,
2542 .p_encode = (kxdreproc_t)nfs3_xdr_enc_getacl3args,
2543 .p_decode = (kxdrdproc_t)nfs3_xdr_dec_getacl3res,
2544 .p_arglen = ACL3_getaclargs_sz,
2545 .p_replen = ACL3_getaclres_sz,
2546 .p_timer = 1,
2547 .p_name = "GETACL",
2548 },
2549 [ACLPROC3_SETACL] = {
2550 .p_proc = ACLPROC3_SETACL,
2551 .p_encode = (kxdreproc_t)nfs3_xdr_enc_setacl3args,
2552 .p_decode = (kxdrdproc_t)nfs3_xdr_dec_setacl3res,
2553 .p_arglen = ACL3_setaclargs_sz,
2554 .p_replen = ACL3_setaclres_sz,
2555 .p_timer = 0,
2556 .p_name = "SETACL",
2557 },
2558 };
2559
2560 const struct rpc_version nfsacl_version3 = {
2561 .number = 3,
2562 .nrprocs = sizeof(nfs3_acl_procedures)/
2563 sizeof(nfs3_acl_procedures[0]),
2564 .procs = nfs3_acl_procedures,
2565 };
2566 #endif /* CONFIG_NFS_V3_ACL */
2567