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 "nfstrace.h"
25 #include "internal.h"
26
27 #define NFSDBG_FACILITY NFSDBG_XDR
28
29 /* Mapping from NFS error code to "errno" error code. */
30 #define errno_NFSERR_IO EIO
31
32 /*
33 * Declare the space requirements for NFS arguments and replies as
34 * number of 32bit-words
35 */
36 #define NFS3_fhandle_sz (1+16)
37 #define NFS3_fh_sz (NFS3_fhandle_sz) /* shorthand */
38 #define NFS3_post_op_fh_sz (1+NFS3_fh_sz)
39 #define NFS3_sattr_sz (15)
40 #define NFS3_filename_sz (1+(NFS3_MAXNAMLEN>>2))
41 #define NFS3_path_sz (1+(NFS3_MAXPATHLEN>>2))
42 #define NFS3_fattr_sz (21)
43 #define NFS3_cookieverf_sz (NFS3_COOKIEVERFSIZE>>2)
44 #define NFS3_wcc_attr_sz (6)
45 #define NFS3_pre_op_attr_sz (1+NFS3_wcc_attr_sz)
46 #define NFS3_post_op_attr_sz (1+NFS3_fattr_sz)
47 #define NFS3_wcc_data_sz (NFS3_pre_op_attr_sz+NFS3_post_op_attr_sz)
48 #define NFS3_diropargs_sz (NFS3_fh_sz+NFS3_filename_sz)
49
50 #define NFS3_getattrargs_sz (NFS3_fh_sz)
51 #define NFS3_setattrargs_sz (NFS3_fh_sz+NFS3_sattr_sz+3)
52 #define NFS3_lookupargs_sz (NFS3_fh_sz+NFS3_filename_sz)
53 #define NFS3_accessargs_sz (NFS3_fh_sz+1)
54 #define NFS3_readlinkargs_sz (NFS3_fh_sz)
55 #define NFS3_readargs_sz (NFS3_fh_sz+3)
56 #define NFS3_writeargs_sz (NFS3_fh_sz+5)
57 #define NFS3_createargs_sz (NFS3_diropargs_sz+NFS3_sattr_sz)
58 #define NFS3_mkdirargs_sz (NFS3_diropargs_sz+NFS3_sattr_sz)
59 #define NFS3_symlinkargs_sz (NFS3_diropargs_sz+1+NFS3_sattr_sz)
60 #define NFS3_mknodargs_sz (NFS3_diropargs_sz+2+NFS3_sattr_sz)
61 #define NFS3_removeargs_sz (NFS3_fh_sz+NFS3_filename_sz)
62 #define NFS3_renameargs_sz (NFS3_diropargs_sz+NFS3_diropargs_sz)
63 #define NFS3_linkargs_sz (NFS3_fh_sz+NFS3_diropargs_sz)
64 #define NFS3_readdirargs_sz (NFS3_fh_sz+NFS3_cookieverf_sz+3)
65 #define NFS3_readdirplusargs_sz (NFS3_fh_sz+NFS3_cookieverf_sz+4)
66 #define NFS3_commitargs_sz (NFS3_fh_sz+3)
67
68 #define NFS3_getattrres_sz (1+NFS3_fattr_sz)
69 #define NFS3_setattrres_sz (1+NFS3_wcc_data_sz)
70 #define NFS3_removeres_sz (NFS3_setattrres_sz)
71 #define NFS3_lookupres_sz (1+NFS3_fh_sz+(2 * NFS3_post_op_attr_sz))
72 #define NFS3_accessres_sz (1+NFS3_post_op_attr_sz+1)
73 #define NFS3_readlinkres_sz (1+NFS3_post_op_attr_sz+1+1)
74 #define NFS3_readres_sz (1+NFS3_post_op_attr_sz+3+1)
75 #define NFS3_writeres_sz (1+NFS3_wcc_data_sz+4)
76 #define NFS3_createres_sz (1+NFS3_post_op_fh_sz+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
77 #define NFS3_renameres_sz (1+(2 * NFS3_wcc_data_sz))
78 #define NFS3_linkres_sz (1+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
79 #define NFS3_readdirres_sz (1+NFS3_post_op_attr_sz+2+1)
80 #define NFS3_fsstatres_sz (1+NFS3_post_op_attr_sz+13)
81 #define NFS3_fsinfores_sz (1+NFS3_post_op_attr_sz+12)
82 #define NFS3_pathconfres_sz (1+NFS3_post_op_attr_sz+6)
83 #define NFS3_commitres_sz (1+NFS3_wcc_data_sz+2)
84
85 #define ACL3_getaclargs_sz (NFS3_fh_sz+1)
86 #define ACL3_setaclargs_sz (NFS3_fh_sz+1+ \
87 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
88 #define ACL3_getaclres_sz (1+NFS3_post_op_attr_sz+1+ \
89 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE)+1)
90 #define ACL3_setaclres_sz (1+NFS3_post_op_attr_sz)
91
92 static int nfs3_stat_to_errno(enum nfs_stat);
93
94 /*
95 * Map file type to S_IFMT bits
96 */
97 static const umode_t nfs_type2fmt[] = {
98 [NF3BAD] = 0,
99 [NF3REG] = S_IFREG,
100 [NF3DIR] = S_IFDIR,
101 [NF3BLK] = S_IFBLK,
102 [NF3CHR] = S_IFCHR,
103 [NF3LNK] = S_IFLNK,
104 [NF3SOCK] = S_IFSOCK,
105 [NF3FIFO] = S_IFIFO,
106 };
107
rpc_userns(const struct rpc_clnt * clnt)108 static struct user_namespace *rpc_userns(const struct rpc_clnt *clnt)
109 {
110 if (clnt && clnt->cl_cred)
111 return clnt->cl_cred->user_ns;
112 return &init_user_ns;
113 }
114
rpc_rqst_userns(const struct rpc_rqst * rqstp)115 static struct user_namespace *rpc_rqst_userns(const struct rpc_rqst *rqstp)
116 {
117 if (rqstp->rq_task)
118 return rpc_userns(rqstp->rq_task->tk_client);
119 return &init_user_ns;
120 }
121
122 /*
123 * Encode/decode NFSv3 basic data types
124 *
125 * Basic NFSv3 data types are defined in section 2.5 of RFC 1813:
126 * "NFS Version 3 Protocol Specification".
127 *
128 * Not all basic data types have their own encoding and decoding
129 * functions. For run-time efficiency, some data types are encoded
130 * or decoded inline.
131 */
132
encode_uint32(struct xdr_stream * xdr,u32 value)133 static void encode_uint32(struct xdr_stream *xdr, u32 value)
134 {
135 __be32 *p = xdr_reserve_space(xdr, 4);
136 *p = cpu_to_be32(value);
137 }
138
decode_uint32(struct xdr_stream * xdr,u32 * value)139 static int decode_uint32(struct xdr_stream *xdr, u32 *value)
140 {
141 __be32 *p;
142
143 p = xdr_inline_decode(xdr, 4);
144 if (unlikely(!p))
145 return -EIO;
146 *value = be32_to_cpup(p);
147 return 0;
148 }
149
decode_uint64(struct xdr_stream * xdr,u64 * value)150 static int decode_uint64(struct xdr_stream *xdr, u64 *value)
151 {
152 __be32 *p;
153
154 p = xdr_inline_decode(xdr, 8);
155 if (unlikely(!p))
156 return -EIO;
157 xdr_decode_hyper(p, value);
158 return 0;
159 }
160
161 /*
162 * fileid3
163 *
164 * typedef uint64 fileid3;
165 */
xdr_decode_fileid3(__be32 * p,u64 * fileid)166 static __be32 *xdr_decode_fileid3(__be32 *p, u64 *fileid)
167 {
168 return xdr_decode_hyper(p, fileid);
169 }
170
decode_fileid3(struct xdr_stream * xdr,u64 * fileid)171 static int decode_fileid3(struct xdr_stream *xdr, u64 *fileid)
172 {
173 return decode_uint64(xdr, fileid);
174 }
175
176 /*
177 * filename3
178 *
179 * typedef string filename3<>;
180 */
encode_filename3(struct xdr_stream * xdr,const char * name,u32 length)181 static void encode_filename3(struct xdr_stream *xdr,
182 const char *name, u32 length)
183 {
184 __be32 *p;
185
186 WARN_ON_ONCE(length > NFS3_MAXNAMLEN);
187 p = xdr_reserve_space(xdr, 4 + length);
188 xdr_encode_opaque(p, name, length);
189 }
190
decode_inline_filename3(struct xdr_stream * xdr,const char ** name,u32 * length)191 static int decode_inline_filename3(struct xdr_stream *xdr,
192 const char **name, u32 *length)
193 {
194 __be32 *p;
195 u32 count;
196
197 p = xdr_inline_decode(xdr, 4);
198 if (unlikely(!p))
199 return -EIO;
200 count = be32_to_cpup(p);
201 if (count > NFS3_MAXNAMLEN)
202 goto out_nametoolong;
203 p = xdr_inline_decode(xdr, count);
204 if (unlikely(!p))
205 return -EIO;
206 *name = (const char *)p;
207 *length = count;
208 return 0;
209
210 out_nametoolong:
211 dprintk("NFS: returned filename too long: %u\n", count);
212 return -ENAMETOOLONG;
213 }
214
215 /*
216 * nfspath3
217 *
218 * typedef string nfspath3<>;
219 */
encode_nfspath3(struct xdr_stream * xdr,struct page ** pages,const u32 length)220 static void encode_nfspath3(struct xdr_stream *xdr, struct page **pages,
221 const u32 length)
222 {
223 encode_uint32(xdr, length);
224 xdr_write_pages(xdr, pages, 0, length);
225 }
226
decode_nfspath3(struct xdr_stream * xdr)227 static int decode_nfspath3(struct xdr_stream *xdr)
228 {
229 u32 recvd, count;
230 __be32 *p;
231
232 p = xdr_inline_decode(xdr, 4);
233 if (unlikely(!p))
234 return -EIO;
235 count = be32_to_cpup(p);
236 if (unlikely(count >= xdr->buf->page_len || count > NFS3_MAXPATHLEN))
237 goto out_nametoolong;
238 recvd = xdr_read_pages(xdr, count);
239 if (unlikely(count > recvd))
240 goto out_cheating;
241 xdr_terminate_string(xdr->buf, count);
242 return 0;
243
244 out_nametoolong:
245 dprintk("NFS: returned pathname too long: %u\n", count);
246 return -ENAMETOOLONG;
247 out_cheating:
248 dprintk("NFS: server cheating in pathname result: "
249 "count %u > recvd %u\n", count, recvd);
250 return -EIO;
251 }
252
253 /*
254 * cookie3
255 *
256 * typedef uint64 cookie3
257 */
xdr_encode_cookie3(__be32 * p,u64 cookie)258 static __be32 *xdr_encode_cookie3(__be32 *p, u64 cookie)
259 {
260 return xdr_encode_hyper(p, cookie);
261 }
262
decode_cookie3(struct xdr_stream * xdr,u64 * cookie)263 static int decode_cookie3(struct xdr_stream *xdr, u64 *cookie)
264 {
265 return decode_uint64(xdr, cookie);
266 }
267
268 /*
269 * cookieverf3
270 *
271 * typedef opaque cookieverf3[NFS3_COOKIEVERFSIZE];
272 */
xdr_encode_cookieverf3(__be32 * p,const __be32 * verifier)273 static __be32 *xdr_encode_cookieverf3(__be32 *p, const __be32 *verifier)
274 {
275 memcpy(p, verifier, NFS3_COOKIEVERFSIZE);
276 return p + XDR_QUADLEN(NFS3_COOKIEVERFSIZE);
277 }
278
decode_cookieverf3(struct xdr_stream * xdr,__be32 * verifier)279 static int decode_cookieverf3(struct xdr_stream *xdr, __be32 *verifier)
280 {
281 __be32 *p;
282
283 p = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE);
284 if (unlikely(!p))
285 return -EIO;
286 memcpy(verifier, p, NFS3_COOKIEVERFSIZE);
287 return 0;
288 }
289
290 /*
291 * createverf3
292 *
293 * typedef opaque createverf3[NFS3_CREATEVERFSIZE];
294 */
encode_createverf3(struct xdr_stream * xdr,const __be32 * verifier)295 static void encode_createverf3(struct xdr_stream *xdr, const __be32 *verifier)
296 {
297 __be32 *p;
298
299 p = xdr_reserve_space(xdr, NFS3_CREATEVERFSIZE);
300 memcpy(p, verifier, NFS3_CREATEVERFSIZE);
301 }
302
decode_writeverf3(struct xdr_stream * xdr,struct nfs_write_verifier * verifier)303 static int decode_writeverf3(struct xdr_stream *xdr, struct nfs_write_verifier *verifier)
304 {
305 __be32 *p;
306
307 p = xdr_inline_decode(xdr, NFS3_WRITEVERFSIZE);
308 if (unlikely(!p))
309 return -EIO;
310 memcpy(verifier->data, p, NFS3_WRITEVERFSIZE);
311 return 0;
312 }
313
314 /*
315 * size3
316 *
317 * typedef uint64 size3;
318 */
xdr_decode_size3(__be32 * p,u64 * size)319 static __be32 *xdr_decode_size3(__be32 *p, u64 *size)
320 {
321 return xdr_decode_hyper(p, size);
322 }
323
324 /*
325 * nfsstat3
326 *
327 * enum nfsstat3 {
328 * NFS3_OK = 0,
329 * ...
330 * }
331 */
332 #define NFS3_OK NFS_OK
333
decode_nfsstat3(struct xdr_stream * xdr,enum nfs_stat * status)334 static int decode_nfsstat3(struct xdr_stream *xdr, enum nfs_stat *status)
335 {
336 __be32 *p;
337
338 p = xdr_inline_decode(xdr, 4);
339 if (unlikely(!p))
340 return -EIO;
341 if (unlikely(*p != cpu_to_be32(NFS3_OK)))
342 goto out_status;
343 *status = 0;
344 return 0;
345 out_status:
346 *status = be32_to_cpup(p);
347 trace_nfs_xdr_status(xdr, (int)*status);
348 return 0;
349 }
350
351 /*
352 * ftype3
353 *
354 * enum ftype3 {
355 * NF3REG = 1,
356 * NF3DIR = 2,
357 * NF3BLK = 3,
358 * NF3CHR = 4,
359 * NF3LNK = 5,
360 * NF3SOCK = 6,
361 * NF3FIFO = 7
362 * };
363 */
encode_ftype3(struct xdr_stream * xdr,const u32 type)364 static void encode_ftype3(struct xdr_stream *xdr, const u32 type)
365 {
366 encode_uint32(xdr, type);
367 }
368
xdr_decode_ftype3(__be32 * p,umode_t * mode)369 static __be32 *xdr_decode_ftype3(__be32 *p, umode_t *mode)
370 {
371 u32 type;
372
373 type = be32_to_cpup(p++);
374 if (type > NF3FIFO)
375 type = NF3NON;
376 *mode = nfs_type2fmt[type];
377 return p;
378 }
379
380 /*
381 * specdata3
382 *
383 * struct specdata3 {
384 * uint32 specdata1;
385 * uint32 specdata2;
386 * };
387 */
encode_specdata3(struct xdr_stream * xdr,const dev_t rdev)388 static void encode_specdata3(struct xdr_stream *xdr, const dev_t rdev)
389 {
390 __be32 *p;
391
392 p = xdr_reserve_space(xdr, 8);
393 *p++ = cpu_to_be32(MAJOR(rdev));
394 *p = cpu_to_be32(MINOR(rdev));
395 }
396
xdr_decode_specdata3(__be32 * p,dev_t * rdev)397 static __be32 *xdr_decode_specdata3(__be32 *p, dev_t *rdev)
398 {
399 unsigned int major, minor;
400
401 major = be32_to_cpup(p++);
402 minor = be32_to_cpup(p++);
403 *rdev = MKDEV(major, minor);
404 if (MAJOR(*rdev) != major || MINOR(*rdev) != minor)
405 *rdev = 0;
406 return p;
407 }
408
409 /*
410 * nfs_fh3
411 *
412 * struct nfs_fh3 {
413 * opaque data<NFS3_FHSIZE>;
414 * };
415 */
encode_nfs_fh3(struct xdr_stream * xdr,const struct nfs_fh * fh)416 static void encode_nfs_fh3(struct xdr_stream *xdr, const struct nfs_fh *fh)
417 {
418 __be32 *p;
419
420 WARN_ON_ONCE(fh->size > NFS3_FHSIZE);
421 p = xdr_reserve_space(xdr, 4 + fh->size);
422 xdr_encode_opaque(p, fh->data, fh->size);
423 }
424
decode_nfs_fh3(struct xdr_stream * xdr,struct nfs_fh * fh)425 static int decode_nfs_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
426 {
427 u32 length;
428 __be32 *p;
429
430 p = xdr_inline_decode(xdr, 4);
431 if (unlikely(!p))
432 return -EIO;
433 length = be32_to_cpup(p++);
434 if (unlikely(length > NFS3_FHSIZE))
435 goto out_toobig;
436 p = xdr_inline_decode(xdr, length);
437 if (unlikely(!p))
438 return -EIO;
439 fh->size = length;
440 memcpy(fh->data, p, length);
441 return 0;
442 out_toobig:
443 dprintk("NFS: file handle size (%u) too big\n", length);
444 return -E2BIG;
445 }
446
zero_nfs_fh3(struct nfs_fh * fh)447 static void zero_nfs_fh3(struct nfs_fh *fh)
448 {
449 memset(fh, 0, sizeof(*fh));
450 }
451
452 /*
453 * nfstime3
454 *
455 * struct nfstime3 {
456 * uint32 seconds;
457 * uint32 nseconds;
458 * };
459 */
xdr_encode_nfstime3(__be32 * p,const struct timespec64 * timep)460 static __be32 *xdr_encode_nfstime3(__be32 *p, const struct timespec64 *timep)
461 {
462 *p++ = cpu_to_be32((u32)timep->tv_sec);
463 *p++ = cpu_to_be32(timep->tv_nsec);
464 return p;
465 }
466
xdr_decode_nfstime3(__be32 * p,struct timespec64 * timep)467 static __be32 *xdr_decode_nfstime3(__be32 *p, struct timespec64 *timep)
468 {
469 timep->tv_sec = be32_to_cpup(p++);
470 timep->tv_nsec = be32_to_cpup(p++);
471 return p;
472 }
473
474 /*
475 * sattr3
476 *
477 * enum time_how {
478 * DONT_CHANGE = 0,
479 * SET_TO_SERVER_TIME = 1,
480 * SET_TO_CLIENT_TIME = 2
481 * };
482 *
483 * union set_mode3 switch (bool set_it) {
484 * case TRUE:
485 * mode3 mode;
486 * default:
487 * void;
488 * };
489 *
490 * union set_uid3 switch (bool set_it) {
491 * case TRUE:
492 * uid3 uid;
493 * default:
494 * void;
495 * };
496 *
497 * union set_gid3 switch (bool set_it) {
498 * case TRUE:
499 * gid3 gid;
500 * default:
501 * void;
502 * };
503 *
504 * union set_size3 switch (bool set_it) {
505 * case TRUE:
506 * size3 size;
507 * default:
508 * void;
509 * };
510 *
511 * union set_atime switch (time_how set_it) {
512 * case SET_TO_CLIENT_TIME:
513 * nfstime3 atime;
514 * default:
515 * void;
516 * };
517 *
518 * union set_mtime switch (time_how set_it) {
519 * case SET_TO_CLIENT_TIME:
520 * nfstime3 mtime;
521 * default:
522 * void;
523 * };
524 *
525 * struct sattr3 {
526 * set_mode3 mode;
527 * set_uid3 uid;
528 * set_gid3 gid;
529 * set_size3 size;
530 * set_atime atime;
531 * set_mtime mtime;
532 * };
533 */
encode_sattr3(struct xdr_stream * xdr,const struct iattr * attr,struct user_namespace * userns)534 static void encode_sattr3(struct xdr_stream *xdr, const struct iattr *attr,
535 struct user_namespace *userns)
536 {
537 u32 nbytes;
538 __be32 *p;
539
540 /*
541 * In order to make only a single xdr_reserve_space() call,
542 * pre-compute the total number of bytes to be reserved.
543 * Six boolean values, one for each set_foo field, are always
544 * present in the encoded result, so start there.
545 */
546 nbytes = 6 * 4;
547 if (attr->ia_valid & ATTR_MODE)
548 nbytes += 4;
549 if (attr->ia_valid & ATTR_UID)
550 nbytes += 4;
551 if (attr->ia_valid & ATTR_GID)
552 nbytes += 4;
553 if (attr->ia_valid & ATTR_SIZE)
554 nbytes += 8;
555 if (attr->ia_valid & ATTR_ATIME_SET)
556 nbytes += 8;
557 if (attr->ia_valid & ATTR_MTIME_SET)
558 nbytes += 8;
559 p = xdr_reserve_space(xdr, nbytes);
560
561 if (attr->ia_valid & ATTR_MODE) {
562 *p++ = xdr_one;
563 *p++ = cpu_to_be32(attr->ia_mode & S_IALLUGO);
564 } else
565 *p++ = xdr_zero;
566
567 if (attr->ia_valid & ATTR_UID) {
568 *p++ = xdr_one;
569 *p++ = cpu_to_be32(from_kuid_munged(userns, attr->ia_uid));
570 } else
571 *p++ = xdr_zero;
572
573 if (attr->ia_valid & ATTR_GID) {
574 *p++ = xdr_one;
575 *p++ = cpu_to_be32(from_kgid_munged(userns, attr->ia_gid));
576 } else
577 *p++ = xdr_zero;
578
579 if (attr->ia_valid & ATTR_SIZE) {
580 *p++ = xdr_one;
581 p = xdr_encode_hyper(p, (u64)attr->ia_size);
582 } else
583 *p++ = xdr_zero;
584
585 if (attr->ia_valid & ATTR_ATIME_SET) {
586 *p++ = xdr_two;
587 p = xdr_encode_nfstime3(p, &attr->ia_atime);
588 } else if (attr->ia_valid & ATTR_ATIME) {
589 *p++ = xdr_one;
590 } else
591 *p++ = xdr_zero;
592
593 if (attr->ia_valid & ATTR_MTIME_SET) {
594 *p++ = xdr_two;
595 xdr_encode_nfstime3(p, &attr->ia_mtime);
596 } else if (attr->ia_valid & ATTR_MTIME) {
597 *p = xdr_one;
598 } else
599 *p = xdr_zero;
600 }
601
602 /*
603 * fattr3
604 *
605 * struct fattr3 {
606 * ftype3 type;
607 * mode3 mode;
608 * uint32 nlink;
609 * uid3 uid;
610 * gid3 gid;
611 * size3 size;
612 * size3 used;
613 * specdata3 rdev;
614 * uint64 fsid;
615 * fileid3 fileid;
616 * nfstime3 atime;
617 * nfstime3 mtime;
618 * nfstime3 ctime;
619 * };
620 */
decode_fattr3(struct xdr_stream * xdr,struct nfs_fattr * fattr,struct user_namespace * userns)621 static int decode_fattr3(struct xdr_stream *xdr, struct nfs_fattr *fattr,
622 struct user_namespace *userns)
623 {
624 umode_t fmode;
625 __be32 *p;
626
627 p = xdr_inline_decode(xdr, NFS3_fattr_sz << 2);
628 if (unlikely(!p))
629 return -EIO;
630
631 p = xdr_decode_ftype3(p, &fmode);
632
633 fattr->mode = (be32_to_cpup(p++) & ~S_IFMT) | fmode;
634 fattr->nlink = be32_to_cpup(p++);
635 fattr->uid = make_kuid(userns, be32_to_cpup(p++));
636 if (!uid_valid(fattr->uid))
637 goto out_uid;
638 fattr->gid = make_kgid(userns, be32_to_cpup(p++));
639 if (!gid_valid(fattr->gid))
640 goto out_gid;
641
642 p = xdr_decode_size3(p, &fattr->size);
643 p = xdr_decode_size3(p, &fattr->du.nfs3.used);
644 p = xdr_decode_specdata3(p, &fattr->rdev);
645
646 p = xdr_decode_hyper(p, &fattr->fsid.major);
647 fattr->fsid.minor = 0;
648
649 p = xdr_decode_fileid3(p, &fattr->fileid);
650 p = xdr_decode_nfstime3(p, &fattr->atime);
651 p = xdr_decode_nfstime3(p, &fattr->mtime);
652 xdr_decode_nfstime3(p, &fattr->ctime);
653 fattr->change_attr = nfs_timespec_to_change_attr(&fattr->ctime);
654
655 fattr->valid |= NFS_ATTR_FATTR_V3;
656 return 0;
657 out_uid:
658 dprintk("NFS: returned invalid uid\n");
659 return -EINVAL;
660 out_gid:
661 dprintk("NFS: returned invalid gid\n");
662 return -EINVAL;
663 }
664
665 /*
666 * post_op_attr
667 *
668 * union post_op_attr switch (bool attributes_follow) {
669 * case TRUE:
670 * fattr3 attributes;
671 * case FALSE:
672 * void;
673 * };
674 */
decode_post_op_attr(struct xdr_stream * xdr,struct nfs_fattr * fattr,struct user_namespace * userns)675 static int decode_post_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr,
676 struct user_namespace *userns)
677 {
678 __be32 *p;
679
680 p = xdr_inline_decode(xdr, 4);
681 if (unlikely(!p))
682 return -EIO;
683 if (*p != xdr_zero)
684 return decode_fattr3(xdr, fattr, userns);
685 return 0;
686 }
687
688 /*
689 * wcc_attr
690 * struct wcc_attr {
691 * size3 size;
692 * nfstime3 mtime;
693 * nfstime3 ctime;
694 * };
695 */
decode_wcc_attr(struct xdr_stream * xdr,struct nfs_fattr * fattr)696 static int decode_wcc_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
697 {
698 __be32 *p;
699
700 p = xdr_inline_decode(xdr, NFS3_wcc_attr_sz << 2);
701 if (unlikely(!p))
702 return -EIO;
703
704 fattr->valid |= NFS_ATTR_FATTR_PRESIZE
705 | NFS_ATTR_FATTR_PRECHANGE
706 | NFS_ATTR_FATTR_PREMTIME
707 | NFS_ATTR_FATTR_PRECTIME;
708
709 p = xdr_decode_size3(p, &fattr->pre_size);
710 p = xdr_decode_nfstime3(p, &fattr->pre_mtime);
711 xdr_decode_nfstime3(p, &fattr->pre_ctime);
712 fattr->pre_change_attr = nfs_timespec_to_change_attr(&fattr->pre_ctime);
713
714 return 0;
715 }
716
717 /*
718 * pre_op_attr
719 * union pre_op_attr switch (bool attributes_follow) {
720 * case TRUE:
721 * wcc_attr attributes;
722 * case FALSE:
723 * void;
724 * };
725 *
726 * wcc_data
727 *
728 * struct wcc_data {
729 * pre_op_attr before;
730 * post_op_attr after;
731 * };
732 */
decode_pre_op_attr(struct xdr_stream * xdr,struct nfs_fattr * fattr)733 static int decode_pre_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
734 {
735 __be32 *p;
736
737 p = xdr_inline_decode(xdr, 4);
738 if (unlikely(!p))
739 return -EIO;
740 if (*p != xdr_zero)
741 return decode_wcc_attr(xdr, fattr);
742 return 0;
743 }
744
decode_wcc_data(struct xdr_stream * xdr,struct nfs_fattr * fattr,struct user_namespace * userns)745 static int decode_wcc_data(struct xdr_stream *xdr, struct nfs_fattr *fattr,
746 struct user_namespace *userns)
747 {
748 int error;
749
750 error = decode_pre_op_attr(xdr, fattr);
751 if (unlikely(error))
752 goto out;
753 error = decode_post_op_attr(xdr, fattr, userns);
754 out:
755 return error;
756 }
757
758 /*
759 * post_op_fh3
760 *
761 * union post_op_fh3 switch (bool handle_follows) {
762 * case TRUE:
763 * nfs_fh3 handle;
764 * case FALSE:
765 * void;
766 * };
767 */
decode_post_op_fh3(struct xdr_stream * xdr,struct nfs_fh * fh)768 static int decode_post_op_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
769 {
770 __be32 *p = xdr_inline_decode(xdr, 4);
771 if (unlikely(!p))
772 return -EIO;
773 if (*p != xdr_zero)
774 return decode_nfs_fh3(xdr, fh);
775 zero_nfs_fh3(fh);
776 return 0;
777 }
778
779 /*
780 * diropargs3
781 *
782 * struct diropargs3 {
783 * nfs_fh3 dir;
784 * filename3 name;
785 * };
786 */
encode_diropargs3(struct xdr_stream * xdr,const struct nfs_fh * fh,const char * name,u32 length)787 static void encode_diropargs3(struct xdr_stream *xdr, const struct nfs_fh *fh,
788 const char *name, u32 length)
789 {
790 encode_nfs_fh3(xdr, fh);
791 encode_filename3(xdr, name, length);
792 }
793
794
795 /*
796 * NFSv3 XDR encode functions
797 *
798 * NFSv3 argument types are defined in section 3.3 of RFC 1813:
799 * "NFS Version 3 Protocol Specification".
800 */
801
802 /*
803 * 3.3.1 GETATTR3args
804 *
805 * struct GETATTR3args {
806 * nfs_fh3 object;
807 * };
808 */
nfs3_xdr_enc_getattr3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)809 static void nfs3_xdr_enc_getattr3args(struct rpc_rqst *req,
810 struct xdr_stream *xdr,
811 const void *data)
812 {
813 const struct nfs_fh *fh = data;
814
815 encode_nfs_fh3(xdr, fh);
816 }
817
818 /*
819 * 3.3.2 SETATTR3args
820 *
821 * union sattrguard3 switch (bool check) {
822 * case TRUE:
823 * nfstime3 obj_ctime;
824 * case FALSE:
825 * void;
826 * };
827 *
828 * struct SETATTR3args {
829 * nfs_fh3 object;
830 * sattr3 new_attributes;
831 * sattrguard3 guard;
832 * };
833 */
encode_sattrguard3(struct xdr_stream * xdr,const struct nfs3_sattrargs * args)834 static void encode_sattrguard3(struct xdr_stream *xdr,
835 const struct nfs3_sattrargs *args)
836 {
837 __be32 *p;
838
839 if (args->guard) {
840 p = xdr_reserve_space(xdr, 4 + 8);
841 *p++ = xdr_one;
842 xdr_encode_nfstime3(p, &args->guardtime);
843 } else {
844 p = xdr_reserve_space(xdr, 4);
845 *p = xdr_zero;
846 }
847 }
848
nfs3_xdr_enc_setattr3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)849 static void nfs3_xdr_enc_setattr3args(struct rpc_rqst *req,
850 struct xdr_stream *xdr,
851 const void *data)
852 {
853 const struct nfs3_sattrargs *args = data;
854 encode_nfs_fh3(xdr, args->fh);
855 encode_sattr3(xdr, args->sattr, rpc_rqst_userns(req));
856 encode_sattrguard3(xdr, args);
857 }
858
859 /*
860 * 3.3.3 LOOKUP3args
861 *
862 * struct LOOKUP3args {
863 * diropargs3 what;
864 * };
865 */
nfs3_xdr_enc_lookup3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)866 static void nfs3_xdr_enc_lookup3args(struct rpc_rqst *req,
867 struct xdr_stream *xdr,
868 const void *data)
869 {
870 const struct nfs3_diropargs *args = data;
871
872 encode_diropargs3(xdr, args->fh, args->name, args->len);
873 }
874
875 /*
876 * 3.3.4 ACCESS3args
877 *
878 * struct ACCESS3args {
879 * nfs_fh3 object;
880 * uint32 access;
881 * };
882 */
encode_access3args(struct xdr_stream * xdr,const struct nfs3_accessargs * args)883 static void encode_access3args(struct xdr_stream *xdr,
884 const struct nfs3_accessargs *args)
885 {
886 encode_nfs_fh3(xdr, args->fh);
887 encode_uint32(xdr, args->access);
888 }
889
nfs3_xdr_enc_access3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)890 static void nfs3_xdr_enc_access3args(struct rpc_rqst *req,
891 struct xdr_stream *xdr,
892 const void *data)
893 {
894 const struct nfs3_accessargs *args = data;
895
896 encode_access3args(xdr, args);
897 }
898
899 /*
900 * 3.3.5 READLINK3args
901 *
902 * struct READLINK3args {
903 * nfs_fh3 symlink;
904 * };
905 */
nfs3_xdr_enc_readlink3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)906 static void nfs3_xdr_enc_readlink3args(struct rpc_rqst *req,
907 struct xdr_stream *xdr,
908 const void *data)
909 {
910 const struct nfs3_readlinkargs *args = data;
911
912 encode_nfs_fh3(xdr, args->fh);
913 rpc_prepare_reply_pages(req, args->pages, args->pgbase,
914 args->pglen, NFS3_readlinkres_sz);
915 }
916
917 /*
918 * 3.3.6 READ3args
919 *
920 * struct READ3args {
921 * nfs_fh3 file;
922 * offset3 offset;
923 * count3 count;
924 * };
925 */
encode_read3args(struct xdr_stream * xdr,const struct nfs_pgio_args * args)926 static void encode_read3args(struct xdr_stream *xdr,
927 const struct nfs_pgio_args *args)
928 {
929 __be32 *p;
930
931 encode_nfs_fh3(xdr, args->fh);
932
933 p = xdr_reserve_space(xdr, 8 + 4);
934 p = xdr_encode_hyper(p, args->offset);
935 *p = cpu_to_be32(args->count);
936 }
937
nfs3_xdr_enc_read3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)938 static void nfs3_xdr_enc_read3args(struct rpc_rqst *req,
939 struct xdr_stream *xdr,
940 const void *data)
941 {
942 const struct nfs_pgio_args *args = data;
943 unsigned int replen = args->replen ? args->replen : NFS3_readres_sz;
944
945 encode_read3args(xdr, args);
946 rpc_prepare_reply_pages(req, args->pages, args->pgbase,
947 args->count, replen);
948 req->rq_rcv_buf.flags |= XDRBUF_READ;
949 }
950
951 /*
952 * 3.3.7 WRITE3args
953 *
954 * enum stable_how {
955 * UNSTABLE = 0,
956 * DATA_SYNC = 1,
957 * FILE_SYNC = 2
958 * };
959 *
960 * struct WRITE3args {
961 * nfs_fh3 file;
962 * offset3 offset;
963 * count3 count;
964 * stable_how stable;
965 * opaque data<>;
966 * };
967 */
encode_write3args(struct xdr_stream * xdr,const struct nfs_pgio_args * args)968 static void encode_write3args(struct xdr_stream *xdr,
969 const struct nfs_pgio_args *args)
970 {
971 __be32 *p;
972
973 encode_nfs_fh3(xdr, args->fh);
974
975 p = xdr_reserve_space(xdr, 8 + 4 + 4 + 4);
976 p = xdr_encode_hyper(p, args->offset);
977 *p++ = cpu_to_be32(args->count);
978 *p++ = cpu_to_be32(args->stable);
979 *p = cpu_to_be32(args->count);
980 xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
981 }
982
nfs3_xdr_enc_write3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)983 static void nfs3_xdr_enc_write3args(struct rpc_rqst *req,
984 struct xdr_stream *xdr,
985 const void *data)
986 {
987 const struct nfs_pgio_args *args = data;
988
989 encode_write3args(xdr, args);
990 xdr->buf->flags |= XDRBUF_WRITE;
991 }
992
993 /*
994 * 3.3.8 CREATE3args
995 *
996 * enum createmode3 {
997 * UNCHECKED = 0,
998 * GUARDED = 1,
999 * EXCLUSIVE = 2
1000 * };
1001 *
1002 * union createhow3 switch (createmode3 mode) {
1003 * case UNCHECKED:
1004 * case GUARDED:
1005 * sattr3 obj_attributes;
1006 * case EXCLUSIVE:
1007 * createverf3 verf;
1008 * };
1009 *
1010 * struct CREATE3args {
1011 * diropargs3 where;
1012 * createhow3 how;
1013 * };
1014 */
encode_createhow3(struct xdr_stream * xdr,const struct nfs3_createargs * args,struct user_namespace * userns)1015 static void encode_createhow3(struct xdr_stream *xdr,
1016 const struct nfs3_createargs *args,
1017 struct user_namespace *userns)
1018 {
1019 encode_uint32(xdr, args->createmode);
1020 switch (args->createmode) {
1021 case NFS3_CREATE_UNCHECKED:
1022 case NFS3_CREATE_GUARDED:
1023 encode_sattr3(xdr, args->sattr, userns);
1024 break;
1025 case NFS3_CREATE_EXCLUSIVE:
1026 encode_createverf3(xdr, args->verifier);
1027 break;
1028 default:
1029 BUG();
1030 }
1031 }
1032
nfs3_xdr_enc_create3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)1033 static void nfs3_xdr_enc_create3args(struct rpc_rqst *req,
1034 struct xdr_stream *xdr,
1035 const void *data)
1036 {
1037 const struct nfs3_createargs *args = data;
1038
1039 encode_diropargs3(xdr, args->fh, args->name, args->len);
1040 encode_createhow3(xdr, args, rpc_rqst_userns(req));
1041 }
1042
1043 /*
1044 * 3.3.9 MKDIR3args
1045 *
1046 * struct MKDIR3args {
1047 * diropargs3 where;
1048 * sattr3 attributes;
1049 * };
1050 */
nfs3_xdr_enc_mkdir3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)1051 static void nfs3_xdr_enc_mkdir3args(struct rpc_rqst *req,
1052 struct xdr_stream *xdr,
1053 const void *data)
1054 {
1055 const struct nfs3_mkdirargs *args = data;
1056
1057 encode_diropargs3(xdr, args->fh, args->name, args->len);
1058 encode_sattr3(xdr, args->sattr, rpc_rqst_userns(req));
1059 }
1060
1061 /*
1062 * 3.3.10 SYMLINK3args
1063 *
1064 * struct symlinkdata3 {
1065 * sattr3 symlink_attributes;
1066 * nfspath3 symlink_data;
1067 * };
1068 *
1069 * struct SYMLINK3args {
1070 * diropargs3 where;
1071 * symlinkdata3 symlink;
1072 * };
1073 */
encode_symlinkdata3(struct xdr_stream * xdr,const void * data,struct user_namespace * userns)1074 static void encode_symlinkdata3(struct xdr_stream *xdr,
1075 const void *data,
1076 struct user_namespace *userns)
1077 {
1078 const struct nfs3_symlinkargs *args = data;
1079
1080 encode_sattr3(xdr, args->sattr, userns);
1081 encode_nfspath3(xdr, args->pages, args->pathlen);
1082 }
1083
nfs3_xdr_enc_symlink3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)1084 static void nfs3_xdr_enc_symlink3args(struct rpc_rqst *req,
1085 struct xdr_stream *xdr,
1086 const void *data)
1087 {
1088 const struct nfs3_symlinkargs *args = data;
1089
1090 encode_diropargs3(xdr, args->fromfh, args->fromname, args->fromlen);
1091 encode_symlinkdata3(xdr, args, rpc_rqst_userns(req));
1092 xdr->buf->flags |= XDRBUF_WRITE;
1093 }
1094
1095 /*
1096 * 3.3.11 MKNOD3args
1097 *
1098 * struct devicedata3 {
1099 * sattr3 dev_attributes;
1100 * specdata3 spec;
1101 * };
1102 *
1103 * union mknoddata3 switch (ftype3 type) {
1104 * case NF3CHR:
1105 * case NF3BLK:
1106 * devicedata3 device;
1107 * case NF3SOCK:
1108 * case NF3FIFO:
1109 * sattr3 pipe_attributes;
1110 * default:
1111 * void;
1112 * };
1113 *
1114 * struct MKNOD3args {
1115 * diropargs3 where;
1116 * mknoddata3 what;
1117 * };
1118 */
encode_devicedata3(struct xdr_stream * xdr,const struct nfs3_mknodargs * args,struct user_namespace * userns)1119 static void encode_devicedata3(struct xdr_stream *xdr,
1120 const struct nfs3_mknodargs *args,
1121 struct user_namespace *userns)
1122 {
1123 encode_sattr3(xdr, args->sattr, userns);
1124 encode_specdata3(xdr, args->rdev);
1125 }
1126
encode_mknoddata3(struct xdr_stream * xdr,const struct nfs3_mknodargs * args,struct user_namespace * userns)1127 static void encode_mknoddata3(struct xdr_stream *xdr,
1128 const struct nfs3_mknodargs *args,
1129 struct user_namespace *userns)
1130 {
1131 encode_ftype3(xdr, args->type);
1132 switch (args->type) {
1133 case NF3CHR:
1134 case NF3BLK:
1135 encode_devicedata3(xdr, args, userns);
1136 break;
1137 case NF3SOCK:
1138 case NF3FIFO:
1139 encode_sattr3(xdr, args->sattr, userns);
1140 break;
1141 case NF3REG:
1142 case NF3DIR:
1143 break;
1144 default:
1145 BUG();
1146 }
1147 }
1148
nfs3_xdr_enc_mknod3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)1149 static void nfs3_xdr_enc_mknod3args(struct rpc_rqst *req,
1150 struct xdr_stream *xdr,
1151 const void *data)
1152 {
1153 const struct nfs3_mknodargs *args = data;
1154
1155 encode_diropargs3(xdr, args->fh, args->name, args->len);
1156 encode_mknoddata3(xdr, args, rpc_rqst_userns(req));
1157 }
1158
1159 /*
1160 * 3.3.12 REMOVE3args
1161 *
1162 * struct REMOVE3args {
1163 * diropargs3 object;
1164 * };
1165 */
nfs3_xdr_enc_remove3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)1166 static void nfs3_xdr_enc_remove3args(struct rpc_rqst *req,
1167 struct xdr_stream *xdr,
1168 const void *data)
1169 {
1170 const struct nfs_removeargs *args = data;
1171
1172 encode_diropargs3(xdr, args->fh, args->name.name, args->name.len);
1173 }
1174
1175 /*
1176 * 3.3.14 RENAME3args
1177 *
1178 * struct RENAME3args {
1179 * diropargs3 from;
1180 * diropargs3 to;
1181 * };
1182 */
nfs3_xdr_enc_rename3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)1183 static void nfs3_xdr_enc_rename3args(struct rpc_rqst *req,
1184 struct xdr_stream *xdr,
1185 const void *data)
1186 {
1187 const struct nfs_renameargs *args = data;
1188 const struct qstr *old = args->old_name;
1189 const struct qstr *new = args->new_name;
1190
1191 encode_diropargs3(xdr, args->old_dir, old->name, old->len);
1192 encode_diropargs3(xdr, args->new_dir, new->name, new->len);
1193 }
1194
1195 /*
1196 * 3.3.15 LINK3args
1197 *
1198 * struct LINK3args {
1199 * nfs_fh3 file;
1200 * diropargs3 link;
1201 * };
1202 */
nfs3_xdr_enc_link3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)1203 static void nfs3_xdr_enc_link3args(struct rpc_rqst *req,
1204 struct xdr_stream *xdr,
1205 const void *data)
1206 {
1207 const struct nfs3_linkargs *args = data;
1208
1209 encode_nfs_fh3(xdr, args->fromfh);
1210 encode_diropargs3(xdr, args->tofh, args->toname, args->tolen);
1211 }
1212
1213 /*
1214 * 3.3.16 READDIR3args
1215 *
1216 * struct READDIR3args {
1217 * nfs_fh3 dir;
1218 * cookie3 cookie;
1219 * cookieverf3 cookieverf;
1220 * count3 count;
1221 * };
1222 */
encode_readdir3args(struct xdr_stream * xdr,const struct nfs3_readdirargs * args)1223 static void encode_readdir3args(struct xdr_stream *xdr,
1224 const struct nfs3_readdirargs *args)
1225 {
1226 __be32 *p;
1227
1228 encode_nfs_fh3(xdr, args->fh);
1229
1230 p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4);
1231 p = xdr_encode_cookie3(p, args->cookie);
1232 p = xdr_encode_cookieverf3(p, args->verf);
1233 *p = cpu_to_be32(args->count);
1234 }
1235
nfs3_xdr_enc_readdir3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)1236 static void nfs3_xdr_enc_readdir3args(struct rpc_rqst *req,
1237 struct xdr_stream *xdr,
1238 const void *data)
1239 {
1240 const struct nfs3_readdirargs *args = data;
1241
1242 encode_readdir3args(xdr, args);
1243 rpc_prepare_reply_pages(req, args->pages, 0,
1244 args->count, NFS3_readdirres_sz);
1245 }
1246
1247 /*
1248 * 3.3.17 READDIRPLUS3args
1249 *
1250 * struct READDIRPLUS3args {
1251 * nfs_fh3 dir;
1252 * cookie3 cookie;
1253 * cookieverf3 cookieverf;
1254 * count3 dircount;
1255 * count3 maxcount;
1256 * };
1257 */
encode_readdirplus3args(struct xdr_stream * xdr,const struct nfs3_readdirargs * args)1258 static void encode_readdirplus3args(struct xdr_stream *xdr,
1259 const struct nfs3_readdirargs *args)
1260 {
1261 __be32 *p;
1262
1263 encode_nfs_fh3(xdr, args->fh);
1264
1265 p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4 + 4);
1266 p = xdr_encode_cookie3(p, args->cookie);
1267 p = xdr_encode_cookieverf3(p, args->verf);
1268
1269 /*
1270 * readdirplus: need dircount + buffer size.
1271 * We just make sure we make dircount big enough
1272 */
1273 *p++ = cpu_to_be32(args->count >> 3);
1274
1275 *p = cpu_to_be32(args->count);
1276 }
1277
nfs3_xdr_enc_readdirplus3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)1278 static void nfs3_xdr_enc_readdirplus3args(struct rpc_rqst *req,
1279 struct xdr_stream *xdr,
1280 const void *data)
1281 {
1282 const struct nfs3_readdirargs *args = data;
1283
1284 encode_readdirplus3args(xdr, args);
1285 rpc_prepare_reply_pages(req, args->pages, 0,
1286 args->count, NFS3_readdirres_sz);
1287 }
1288
1289 /*
1290 * 3.3.21 COMMIT3args
1291 *
1292 * struct COMMIT3args {
1293 * nfs_fh3 file;
1294 * offset3 offset;
1295 * count3 count;
1296 * };
1297 */
encode_commit3args(struct xdr_stream * xdr,const struct nfs_commitargs * args)1298 static void encode_commit3args(struct xdr_stream *xdr,
1299 const struct nfs_commitargs *args)
1300 {
1301 __be32 *p;
1302
1303 encode_nfs_fh3(xdr, args->fh);
1304
1305 p = xdr_reserve_space(xdr, 8 + 4);
1306 p = xdr_encode_hyper(p, args->offset);
1307 *p = cpu_to_be32(args->count);
1308 }
1309
nfs3_xdr_enc_commit3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)1310 static void nfs3_xdr_enc_commit3args(struct rpc_rqst *req,
1311 struct xdr_stream *xdr,
1312 const void *data)
1313 {
1314 const struct nfs_commitargs *args = data;
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 void * data)1321 static void nfs3_xdr_enc_getacl3args(struct rpc_rqst *req,
1322 struct xdr_stream *xdr,
1323 const void *data)
1324 {
1325 const struct nfs3_getaclargs *args = data;
1326
1327 encode_nfs_fh3(xdr, args->fh);
1328 encode_uint32(xdr, args->mask);
1329 if (args->mask & (NFS_ACL | NFS_DFACL)) {
1330 rpc_prepare_reply_pages(req, args->pages, 0,
1331 NFSACL_MAXPAGES << PAGE_SHIFT,
1332 ACL3_getaclres_sz);
1333 req->rq_rcv_buf.flags |= XDRBUF_SPARSE_PAGES;
1334 }
1335 }
1336
nfs3_xdr_enc_setacl3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)1337 static void nfs3_xdr_enc_setacl3args(struct rpc_rqst *req,
1338 struct xdr_stream *xdr,
1339 const void *data)
1340 {
1341 const struct nfs3_setaclargs *args = data;
1342 unsigned int base;
1343 int error;
1344
1345 encode_nfs_fh3(xdr, NFS_FH(args->inode));
1346 encode_uint32(xdr, args->mask);
1347
1348 base = req->rq_slen;
1349 if (args->npages != 0)
1350 xdr_write_pages(xdr, args->pages, 0, args->len);
1351 else
1352 xdr_reserve_space(xdr, args->len);
1353
1354 error = nfsacl_encode(xdr->buf, base, args->inode,
1355 (args->mask & NFS_ACL) ?
1356 args->acl_access : NULL, 1, 0);
1357 /* FIXME: this is just broken */
1358 BUG_ON(error < 0);
1359 error = nfsacl_encode(xdr->buf, base + error, args->inode,
1360 (args->mask & NFS_DFACL) ?
1361 args->acl_default : NULL, 1,
1362 NFS_ACL_DEFAULT);
1363 BUG_ON(error < 0);
1364 }
1365
1366 #endif /* CONFIG_NFS_V3_ACL */
1367
1368 /*
1369 * NFSv3 XDR decode functions
1370 *
1371 * NFSv3 result types are defined in section 3.3 of RFC 1813:
1372 * "NFS Version 3 Protocol Specification".
1373 */
1374
1375 /*
1376 * 3.3.1 GETATTR3res
1377 *
1378 * struct GETATTR3resok {
1379 * fattr3 obj_attributes;
1380 * };
1381 *
1382 * union GETATTR3res switch (nfsstat3 status) {
1383 * case NFS3_OK:
1384 * GETATTR3resok resok;
1385 * default:
1386 * void;
1387 * };
1388 */
nfs3_xdr_dec_getattr3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * result)1389 static int nfs3_xdr_dec_getattr3res(struct rpc_rqst *req,
1390 struct xdr_stream *xdr,
1391 void *result)
1392 {
1393 enum nfs_stat status;
1394 int error;
1395
1396 error = decode_nfsstat3(xdr, &status);
1397 if (unlikely(error))
1398 goto out;
1399 if (status != NFS3_OK)
1400 goto out_default;
1401 error = decode_fattr3(xdr, result, rpc_rqst_userns(req));
1402 out:
1403 return error;
1404 out_default:
1405 return nfs3_stat_to_errno(status);
1406 }
1407
1408 /*
1409 * 3.3.2 SETATTR3res
1410 *
1411 * struct SETATTR3resok {
1412 * wcc_data obj_wcc;
1413 * };
1414 *
1415 * struct SETATTR3resfail {
1416 * wcc_data obj_wcc;
1417 * };
1418 *
1419 * union SETATTR3res switch (nfsstat3 status) {
1420 * case NFS3_OK:
1421 * SETATTR3resok resok;
1422 * default:
1423 * SETATTR3resfail resfail;
1424 * };
1425 */
nfs3_xdr_dec_setattr3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * result)1426 static int nfs3_xdr_dec_setattr3res(struct rpc_rqst *req,
1427 struct xdr_stream *xdr,
1428 void *result)
1429 {
1430 enum nfs_stat status;
1431 int error;
1432
1433 error = decode_nfsstat3(xdr, &status);
1434 if (unlikely(error))
1435 goto out;
1436 error = decode_wcc_data(xdr, result, rpc_rqst_userns(req));
1437 if (unlikely(error))
1438 goto out;
1439 if (status != NFS3_OK)
1440 goto out_status;
1441 out:
1442 return error;
1443 out_status:
1444 return nfs3_stat_to_errno(status);
1445 }
1446
1447 /*
1448 * 3.3.3 LOOKUP3res
1449 *
1450 * struct LOOKUP3resok {
1451 * nfs_fh3 object;
1452 * post_op_attr obj_attributes;
1453 * post_op_attr dir_attributes;
1454 * };
1455 *
1456 * struct LOOKUP3resfail {
1457 * post_op_attr dir_attributes;
1458 * };
1459 *
1460 * union LOOKUP3res switch (nfsstat3 status) {
1461 * case NFS3_OK:
1462 * LOOKUP3resok resok;
1463 * default:
1464 * LOOKUP3resfail resfail;
1465 * };
1466 */
nfs3_xdr_dec_lookup3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * data)1467 static int nfs3_xdr_dec_lookup3res(struct rpc_rqst *req,
1468 struct xdr_stream *xdr,
1469 void *data)
1470 {
1471 struct user_namespace *userns = rpc_rqst_userns(req);
1472 struct nfs3_diropres *result = data;
1473 enum nfs_stat status;
1474 int error;
1475
1476 error = decode_nfsstat3(xdr, &status);
1477 if (unlikely(error))
1478 goto out;
1479 if (status != NFS3_OK)
1480 goto out_default;
1481 error = decode_nfs_fh3(xdr, result->fh);
1482 if (unlikely(error))
1483 goto out;
1484 error = decode_post_op_attr(xdr, result->fattr, userns);
1485 if (unlikely(error))
1486 goto out;
1487 error = decode_post_op_attr(xdr, result->dir_attr, userns);
1488 out:
1489 return error;
1490 out_default:
1491 error = decode_post_op_attr(xdr, result->dir_attr, userns);
1492 if (unlikely(error))
1493 goto out;
1494 return nfs3_stat_to_errno(status);
1495 }
1496
1497 /*
1498 * 3.3.4 ACCESS3res
1499 *
1500 * struct ACCESS3resok {
1501 * post_op_attr obj_attributes;
1502 * uint32 access;
1503 * };
1504 *
1505 * struct ACCESS3resfail {
1506 * post_op_attr obj_attributes;
1507 * };
1508 *
1509 * union ACCESS3res switch (nfsstat3 status) {
1510 * case NFS3_OK:
1511 * ACCESS3resok resok;
1512 * default:
1513 * ACCESS3resfail resfail;
1514 * };
1515 */
nfs3_xdr_dec_access3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * data)1516 static int nfs3_xdr_dec_access3res(struct rpc_rqst *req,
1517 struct xdr_stream *xdr,
1518 void *data)
1519 {
1520 struct nfs3_accessres *result = data;
1521 enum nfs_stat status;
1522 int error;
1523
1524 error = decode_nfsstat3(xdr, &status);
1525 if (unlikely(error))
1526 goto out;
1527 error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req));
1528 if (unlikely(error))
1529 goto out;
1530 if (status != NFS3_OK)
1531 goto out_default;
1532 error = decode_uint32(xdr, &result->access);
1533 out:
1534 return error;
1535 out_default:
1536 return nfs3_stat_to_errno(status);
1537 }
1538
1539 /*
1540 * 3.3.5 READLINK3res
1541 *
1542 * struct READLINK3resok {
1543 * post_op_attr symlink_attributes;
1544 * nfspath3 data;
1545 * };
1546 *
1547 * struct READLINK3resfail {
1548 * post_op_attr symlink_attributes;
1549 * };
1550 *
1551 * union READLINK3res switch (nfsstat3 status) {
1552 * case NFS3_OK:
1553 * READLINK3resok resok;
1554 * default:
1555 * READLINK3resfail resfail;
1556 * };
1557 */
nfs3_xdr_dec_readlink3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * result)1558 static int nfs3_xdr_dec_readlink3res(struct rpc_rqst *req,
1559 struct xdr_stream *xdr,
1560 void *result)
1561 {
1562 enum nfs_stat status;
1563 int error;
1564
1565 error = decode_nfsstat3(xdr, &status);
1566 if (unlikely(error))
1567 goto out;
1568 error = decode_post_op_attr(xdr, result, rpc_rqst_userns(req));
1569 if (unlikely(error))
1570 goto out;
1571 if (status != NFS3_OK)
1572 goto out_default;
1573 error = decode_nfspath3(xdr);
1574 out:
1575 return error;
1576 out_default:
1577 return nfs3_stat_to_errno(status);
1578 }
1579
1580 /*
1581 * 3.3.6 READ3res
1582 *
1583 * struct READ3resok {
1584 * post_op_attr file_attributes;
1585 * count3 count;
1586 * bool eof;
1587 * opaque data<>;
1588 * };
1589 *
1590 * struct READ3resfail {
1591 * post_op_attr file_attributes;
1592 * };
1593 *
1594 * union READ3res switch (nfsstat3 status) {
1595 * case NFS3_OK:
1596 * READ3resok resok;
1597 * default:
1598 * READ3resfail resfail;
1599 * };
1600 */
decode_read3resok(struct xdr_stream * xdr,struct nfs_pgio_res * result)1601 static int decode_read3resok(struct xdr_stream *xdr,
1602 struct nfs_pgio_res *result)
1603 {
1604 u32 eof, count, ocount, recvd;
1605 __be32 *p;
1606
1607 p = xdr_inline_decode(xdr, 4 + 4 + 4);
1608 if (unlikely(!p))
1609 return -EIO;
1610 count = be32_to_cpup(p++);
1611 eof = be32_to_cpup(p++);
1612 ocount = be32_to_cpup(p++);
1613 if (unlikely(ocount != count))
1614 goto out_mismatch;
1615 recvd = xdr_read_pages(xdr, count);
1616 if (unlikely(count > recvd))
1617 goto out_cheating;
1618 out:
1619 result->eof = eof;
1620 result->count = count;
1621 return count;
1622 out_mismatch:
1623 dprintk("NFS: READ count doesn't match length of opaque: "
1624 "count %u != ocount %u\n", count, ocount);
1625 return -EIO;
1626 out_cheating:
1627 dprintk("NFS: server cheating in read result: "
1628 "count %u > recvd %u\n", count, recvd);
1629 count = recvd;
1630 eof = 0;
1631 goto out;
1632 }
1633
nfs3_xdr_dec_read3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * data)1634 static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1635 void *data)
1636 {
1637 struct nfs_pgio_res *result = data;
1638 unsigned int pos;
1639 enum nfs_stat status;
1640 int error;
1641
1642 pos = xdr_stream_pos(xdr);
1643 error = decode_nfsstat3(xdr, &status);
1644 if (unlikely(error))
1645 goto out;
1646 error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req));
1647 if (unlikely(error))
1648 goto out;
1649 result->op_status = status;
1650 if (status != NFS3_OK)
1651 goto out_status;
1652 result->replen = 4 + ((xdr_stream_pos(xdr) - pos) >> 2);
1653 error = decode_read3resok(xdr, result);
1654 out:
1655 return error;
1656 out_status:
1657 return nfs3_stat_to_errno(status);
1658 }
1659
1660 /*
1661 * 3.3.7 WRITE3res
1662 *
1663 * enum stable_how {
1664 * UNSTABLE = 0,
1665 * DATA_SYNC = 1,
1666 * FILE_SYNC = 2
1667 * };
1668 *
1669 * struct WRITE3resok {
1670 * wcc_data file_wcc;
1671 * count3 count;
1672 * stable_how committed;
1673 * writeverf3 verf;
1674 * };
1675 *
1676 * struct WRITE3resfail {
1677 * wcc_data file_wcc;
1678 * };
1679 *
1680 * union WRITE3res switch (nfsstat3 status) {
1681 * case NFS3_OK:
1682 * WRITE3resok resok;
1683 * default:
1684 * WRITE3resfail resfail;
1685 * };
1686 */
decode_write3resok(struct xdr_stream * xdr,struct nfs_pgio_res * result)1687 static int decode_write3resok(struct xdr_stream *xdr,
1688 struct nfs_pgio_res *result)
1689 {
1690 __be32 *p;
1691
1692 p = xdr_inline_decode(xdr, 4 + 4);
1693 if (unlikely(!p))
1694 return -EIO;
1695 result->count = be32_to_cpup(p++);
1696 result->verf->committed = be32_to_cpup(p++);
1697 if (unlikely(result->verf->committed > NFS_FILE_SYNC))
1698 goto out_badvalue;
1699 if (decode_writeverf3(xdr, &result->verf->verifier))
1700 return -EIO;
1701 return result->count;
1702 out_badvalue:
1703 dprintk("NFS: bad stable_how value: %u\n", result->verf->committed);
1704 return -EIO;
1705 }
1706
nfs3_xdr_dec_write3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * data)1707 static int nfs3_xdr_dec_write3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1708 void *data)
1709 {
1710 struct nfs_pgio_res *result = data;
1711 enum nfs_stat status;
1712 int error;
1713
1714 error = decode_nfsstat3(xdr, &status);
1715 if (unlikely(error))
1716 goto out;
1717 error = decode_wcc_data(xdr, result->fattr, rpc_rqst_userns(req));
1718 if (unlikely(error))
1719 goto out;
1720 result->op_status = status;
1721 if (status != NFS3_OK)
1722 goto out_status;
1723 error = decode_write3resok(xdr, result);
1724 out:
1725 return error;
1726 out_status:
1727 return nfs3_stat_to_errno(status);
1728 }
1729
1730 /*
1731 * 3.3.8 CREATE3res
1732 *
1733 * struct CREATE3resok {
1734 * post_op_fh3 obj;
1735 * post_op_attr obj_attributes;
1736 * wcc_data dir_wcc;
1737 * };
1738 *
1739 * struct CREATE3resfail {
1740 * wcc_data dir_wcc;
1741 * };
1742 *
1743 * union CREATE3res switch (nfsstat3 status) {
1744 * case NFS3_OK:
1745 * CREATE3resok resok;
1746 * default:
1747 * CREATE3resfail resfail;
1748 * };
1749 */
decode_create3resok(struct xdr_stream * xdr,struct nfs3_diropres * result,struct user_namespace * userns)1750 static int decode_create3resok(struct xdr_stream *xdr,
1751 struct nfs3_diropres *result,
1752 struct user_namespace *userns)
1753 {
1754 int error;
1755
1756 error = decode_post_op_fh3(xdr, result->fh);
1757 if (unlikely(error))
1758 goto out;
1759 error = decode_post_op_attr(xdr, result->fattr, userns);
1760 if (unlikely(error))
1761 goto out;
1762 /* The server isn't required to return a file handle.
1763 * If it didn't, force the client to perform a LOOKUP
1764 * to determine the correct file handle and attribute
1765 * values for the new object. */
1766 if (result->fh->size == 0)
1767 result->fattr->valid = 0;
1768 error = decode_wcc_data(xdr, result->dir_attr, userns);
1769 out:
1770 return error;
1771 }
1772
nfs3_xdr_dec_create3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * data)1773 static int nfs3_xdr_dec_create3res(struct rpc_rqst *req,
1774 struct xdr_stream *xdr,
1775 void *data)
1776 {
1777 struct user_namespace *userns = rpc_rqst_userns(req);
1778 struct nfs3_diropres *result = data;
1779 enum nfs_stat status;
1780 int error;
1781
1782 error = decode_nfsstat3(xdr, &status);
1783 if (unlikely(error))
1784 goto out;
1785 if (status != NFS3_OK)
1786 goto out_default;
1787 error = decode_create3resok(xdr, result, userns);
1788 out:
1789 return error;
1790 out_default:
1791 error = decode_wcc_data(xdr, result->dir_attr, userns);
1792 if (unlikely(error))
1793 goto out;
1794 return nfs3_stat_to_errno(status);
1795 }
1796
1797 /*
1798 * 3.3.12 REMOVE3res
1799 *
1800 * struct REMOVE3resok {
1801 * wcc_data dir_wcc;
1802 * };
1803 *
1804 * struct REMOVE3resfail {
1805 * wcc_data dir_wcc;
1806 * };
1807 *
1808 * union REMOVE3res switch (nfsstat3 status) {
1809 * case NFS3_OK:
1810 * REMOVE3resok resok;
1811 * default:
1812 * REMOVE3resfail resfail;
1813 * };
1814 */
nfs3_xdr_dec_remove3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * data)1815 static int nfs3_xdr_dec_remove3res(struct rpc_rqst *req,
1816 struct xdr_stream *xdr,
1817 void *data)
1818 {
1819 struct nfs_removeres *result = data;
1820 enum nfs_stat status;
1821 int error;
1822
1823 error = decode_nfsstat3(xdr, &status);
1824 if (unlikely(error))
1825 goto out;
1826 error = decode_wcc_data(xdr, result->dir_attr, rpc_rqst_userns(req));
1827 if (unlikely(error))
1828 goto out;
1829 if (status != NFS3_OK)
1830 goto out_status;
1831 out:
1832 return error;
1833 out_status:
1834 return nfs3_stat_to_errno(status);
1835 }
1836
1837 /*
1838 * 3.3.14 RENAME3res
1839 *
1840 * struct RENAME3resok {
1841 * wcc_data fromdir_wcc;
1842 * wcc_data todir_wcc;
1843 * };
1844 *
1845 * struct RENAME3resfail {
1846 * wcc_data fromdir_wcc;
1847 * wcc_data todir_wcc;
1848 * };
1849 *
1850 * union RENAME3res switch (nfsstat3 status) {
1851 * case NFS3_OK:
1852 * RENAME3resok resok;
1853 * default:
1854 * RENAME3resfail resfail;
1855 * };
1856 */
nfs3_xdr_dec_rename3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * data)1857 static int nfs3_xdr_dec_rename3res(struct rpc_rqst *req,
1858 struct xdr_stream *xdr,
1859 void *data)
1860 {
1861 struct user_namespace *userns = rpc_rqst_userns(req);
1862 struct nfs_renameres *result = data;
1863 enum nfs_stat status;
1864 int error;
1865
1866 error = decode_nfsstat3(xdr, &status);
1867 if (unlikely(error))
1868 goto out;
1869 error = decode_wcc_data(xdr, result->old_fattr, userns);
1870 if (unlikely(error))
1871 goto out;
1872 error = decode_wcc_data(xdr, result->new_fattr, userns);
1873 if (unlikely(error))
1874 goto out;
1875 if (status != NFS3_OK)
1876 goto out_status;
1877 out:
1878 return error;
1879 out_status:
1880 return nfs3_stat_to_errno(status);
1881 }
1882
1883 /*
1884 * 3.3.15 LINK3res
1885 *
1886 * struct LINK3resok {
1887 * post_op_attr file_attributes;
1888 * wcc_data linkdir_wcc;
1889 * };
1890 *
1891 * struct LINK3resfail {
1892 * post_op_attr file_attributes;
1893 * wcc_data linkdir_wcc;
1894 * };
1895 *
1896 * union LINK3res switch (nfsstat3 status) {
1897 * case NFS3_OK:
1898 * LINK3resok resok;
1899 * default:
1900 * LINK3resfail resfail;
1901 * };
1902 */
nfs3_xdr_dec_link3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * data)1903 static int nfs3_xdr_dec_link3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1904 void *data)
1905 {
1906 struct user_namespace *userns = rpc_rqst_userns(req);
1907 struct nfs3_linkres *result = data;
1908 enum nfs_stat status;
1909 int error;
1910
1911 error = decode_nfsstat3(xdr, &status);
1912 if (unlikely(error))
1913 goto out;
1914 error = decode_post_op_attr(xdr, result->fattr, userns);
1915 if (unlikely(error))
1916 goto out;
1917 error = decode_wcc_data(xdr, result->dir_attr, userns);
1918 if (unlikely(error))
1919 goto out;
1920 if (status != NFS3_OK)
1921 goto out_status;
1922 out:
1923 return error;
1924 out_status:
1925 return nfs3_stat_to_errno(status);
1926 }
1927
1928 /**
1929 * nfs3_decode_dirent - Decode a single NFSv3 directory entry stored in
1930 * the local page cache
1931 * @xdr: XDR stream where entry resides
1932 * @entry: buffer to fill in with entry data
1933 * @plus: boolean indicating whether this should be a readdirplus entry
1934 *
1935 * Returns zero if successful, otherwise a negative errno value is
1936 * returned.
1937 *
1938 * This function is not invoked during READDIR reply decoding, but
1939 * rather whenever an application invokes the getdents(2) system call
1940 * on a directory already in our cache.
1941 *
1942 * 3.3.16 entry3
1943 *
1944 * struct entry3 {
1945 * fileid3 fileid;
1946 * filename3 name;
1947 * cookie3 cookie;
1948 * fhandle3 filehandle;
1949 * post_op_attr3 attributes;
1950 * entry3 *nextentry;
1951 * };
1952 *
1953 * 3.3.17 entryplus3
1954 * struct entryplus3 {
1955 * fileid3 fileid;
1956 * filename3 name;
1957 * cookie3 cookie;
1958 * post_op_attr name_attributes;
1959 * post_op_fh3 name_handle;
1960 * entryplus3 *nextentry;
1961 * };
1962 */
nfs3_decode_dirent(struct xdr_stream * xdr,struct nfs_entry * entry,bool plus)1963 int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
1964 bool plus)
1965 {
1966 struct user_namespace *userns = rpc_userns(entry->server->client);
1967 __be32 *p;
1968 int error;
1969 u64 new_cookie;
1970
1971 p = xdr_inline_decode(xdr, 4);
1972 if (unlikely(!p))
1973 return -EAGAIN;
1974 if (*p == xdr_zero) {
1975 p = xdr_inline_decode(xdr, 4);
1976 if (unlikely(!p))
1977 return -EAGAIN;
1978 if (*p == xdr_zero)
1979 return -EAGAIN;
1980 entry->eof = 1;
1981 return -EBADCOOKIE;
1982 }
1983
1984 error = decode_fileid3(xdr, &entry->ino);
1985 if (unlikely(error))
1986 return -EAGAIN;
1987
1988 error = decode_inline_filename3(xdr, &entry->name, &entry->len);
1989 if (unlikely(error))
1990 return error == -ENAMETOOLONG ? -ENAMETOOLONG : -EAGAIN;
1991
1992 error = decode_cookie3(xdr, &new_cookie);
1993 if (unlikely(error))
1994 return -EAGAIN;
1995
1996 entry->d_type = DT_UNKNOWN;
1997
1998 if (plus) {
1999 entry->fattr->valid = 0;
2000 error = decode_post_op_attr(xdr, entry->fattr, userns);
2001 if (unlikely(error))
2002 return -EAGAIN;
2003 if (entry->fattr->valid & NFS_ATTR_FATTR_V3)
2004 entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);
2005
2006 if (entry->fattr->fileid != entry->ino) {
2007 entry->fattr->mounted_on_fileid = entry->ino;
2008 entry->fattr->valid |= NFS_ATTR_FATTR_MOUNTED_ON_FILEID;
2009 }
2010
2011 /* In fact, a post_op_fh3: */
2012 p = xdr_inline_decode(xdr, 4);
2013 if (unlikely(!p))
2014 return -EAGAIN;
2015 if (*p != xdr_zero) {
2016 error = decode_nfs_fh3(xdr, entry->fh);
2017 if (unlikely(error))
2018 return -EAGAIN;
2019 } else
2020 zero_nfs_fh3(entry->fh);
2021 }
2022
2023 entry->prev_cookie = entry->cookie;
2024 entry->cookie = new_cookie;
2025
2026 return 0;
2027 }
2028
2029 /*
2030 * 3.3.16 READDIR3res
2031 *
2032 * struct dirlist3 {
2033 * entry3 *entries;
2034 * bool eof;
2035 * };
2036 *
2037 * struct READDIR3resok {
2038 * post_op_attr dir_attributes;
2039 * cookieverf3 cookieverf;
2040 * dirlist3 reply;
2041 * };
2042 *
2043 * struct READDIR3resfail {
2044 * post_op_attr dir_attributes;
2045 * };
2046 *
2047 * union READDIR3res switch (nfsstat3 status) {
2048 * case NFS3_OK:
2049 * READDIR3resok resok;
2050 * default:
2051 * READDIR3resfail resfail;
2052 * };
2053 *
2054 * Read the directory contents into the page cache, but otherwise
2055 * don't touch them. The actual decoding is done by nfs3_decode_entry()
2056 * during subsequent nfs_readdir() calls.
2057 */
decode_dirlist3(struct xdr_stream * xdr)2058 static int decode_dirlist3(struct xdr_stream *xdr)
2059 {
2060 return xdr_read_pages(xdr, xdr->buf->page_len);
2061 }
2062
decode_readdir3resok(struct xdr_stream * xdr,struct nfs3_readdirres * result,struct user_namespace * userns)2063 static int decode_readdir3resok(struct xdr_stream *xdr,
2064 struct nfs3_readdirres *result,
2065 struct user_namespace *userns)
2066 {
2067 int error;
2068
2069 error = decode_post_op_attr(xdr, result->dir_attr, userns);
2070 if (unlikely(error))
2071 goto out;
2072 /* XXX: do we need to check if result->verf != NULL ? */
2073 error = decode_cookieverf3(xdr, result->verf);
2074 if (unlikely(error))
2075 goto out;
2076 error = decode_dirlist3(xdr);
2077 out:
2078 return error;
2079 }
2080
nfs3_xdr_dec_readdir3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * data)2081 static int nfs3_xdr_dec_readdir3res(struct rpc_rqst *req,
2082 struct xdr_stream *xdr,
2083 void *data)
2084 {
2085 struct nfs3_readdirres *result = data;
2086 enum nfs_stat status;
2087 int error;
2088
2089 error = decode_nfsstat3(xdr, &status);
2090 if (unlikely(error))
2091 goto out;
2092 if (status != NFS3_OK)
2093 goto out_default;
2094 error = decode_readdir3resok(xdr, result, rpc_rqst_userns(req));
2095 out:
2096 return error;
2097 out_default:
2098 error = decode_post_op_attr(xdr, result->dir_attr, rpc_rqst_userns(req));
2099 if (unlikely(error))
2100 goto out;
2101 return nfs3_stat_to_errno(status);
2102 }
2103
2104 /*
2105 * 3.3.18 FSSTAT3res
2106 *
2107 * struct FSSTAT3resok {
2108 * post_op_attr obj_attributes;
2109 * size3 tbytes;
2110 * size3 fbytes;
2111 * size3 abytes;
2112 * size3 tfiles;
2113 * size3 ffiles;
2114 * size3 afiles;
2115 * uint32 invarsec;
2116 * };
2117 *
2118 * struct FSSTAT3resfail {
2119 * post_op_attr obj_attributes;
2120 * };
2121 *
2122 * union FSSTAT3res switch (nfsstat3 status) {
2123 * case NFS3_OK:
2124 * FSSTAT3resok resok;
2125 * default:
2126 * FSSTAT3resfail resfail;
2127 * };
2128 */
decode_fsstat3resok(struct xdr_stream * xdr,struct nfs_fsstat * result)2129 static int decode_fsstat3resok(struct xdr_stream *xdr,
2130 struct nfs_fsstat *result)
2131 {
2132 __be32 *p;
2133
2134 p = xdr_inline_decode(xdr, 8 * 6 + 4);
2135 if (unlikely(!p))
2136 return -EIO;
2137 p = xdr_decode_size3(p, &result->tbytes);
2138 p = xdr_decode_size3(p, &result->fbytes);
2139 p = xdr_decode_size3(p, &result->abytes);
2140 p = xdr_decode_size3(p, &result->tfiles);
2141 p = xdr_decode_size3(p, &result->ffiles);
2142 xdr_decode_size3(p, &result->afiles);
2143 /* ignore invarsec */
2144 return 0;
2145 }
2146
nfs3_xdr_dec_fsstat3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * data)2147 static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req,
2148 struct xdr_stream *xdr,
2149 void *data)
2150 {
2151 struct nfs_fsstat *result = data;
2152 enum nfs_stat status;
2153 int error;
2154
2155 error = decode_nfsstat3(xdr, &status);
2156 if (unlikely(error))
2157 goto out;
2158 error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req));
2159 if (unlikely(error))
2160 goto out;
2161 if (status != NFS3_OK)
2162 goto out_status;
2163 error = decode_fsstat3resok(xdr, result);
2164 out:
2165 return error;
2166 out_status:
2167 return nfs3_stat_to_errno(status);
2168 }
2169
2170 /*
2171 * 3.3.19 FSINFO3res
2172 *
2173 * struct FSINFO3resok {
2174 * post_op_attr obj_attributes;
2175 * uint32 rtmax;
2176 * uint32 rtpref;
2177 * uint32 rtmult;
2178 * uint32 wtmax;
2179 * uint32 wtpref;
2180 * uint32 wtmult;
2181 * uint32 dtpref;
2182 * size3 maxfilesize;
2183 * nfstime3 time_delta;
2184 * uint32 properties;
2185 * };
2186 *
2187 * struct FSINFO3resfail {
2188 * post_op_attr obj_attributes;
2189 * };
2190 *
2191 * union FSINFO3res switch (nfsstat3 status) {
2192 * case NFS3_OK:
2193 * FSINFO3resok resok;
2194 * default:
2195 * FSINFO3resfail resfail;
2196 * };
2197 */
decode_fsinfo3resok(struct xdr_stream * xdr,struct nfs_fsinfo * result)2198 static int decode_fsinfo3resok(struct xdr_stream *xdr,
2199 struct nfs_fsinfo *result)
2200 {
2201 __be32 *p;
2202
2203 p = xdr_inline_decode(xdr, 4 * 7 + 8 + 8 + 4);
2204 if (unlikely(!p))
2205 return -EIO;
2206 result->rtmax = be32_to_cpup(p++);
2207 result->rtpref = be32_to_cpup(p++);
2208 result->rtmult = be32_to_cpup(p++);
2209 result->wtmax = be32_to_cpup(p++);
2210 result->wtpref = be32_to_cpup(p++);
2211 result->wtmult = be32_to_cpup(p++);
2212 result->dtpref = be32_to_cpup(p++);
2213 p = xdr_decode_size3(p, &result->maxfilesize);
2214 xdr_decode_nfstime3(p, &result->time_delta);
2215
2216 /* ignore properties */
2217 result->lease_time = 0;
2218 return 0;
2219 }
2220
nfs3_xdr_dec_fsinfo3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * data)2221 static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req,
2222 struct xdr_stream *xdr,
2223 void *data)
2224 {
2225 struct nfs_fsinfo *result = data;
2226 enum nfs_stat status;
2227 int error;
2228
2229 error = decode_nfsstat3(xdr, &status);
2230 if (unlikely(error))
2231 goto out;
2232 error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req));
2233 if (unlikely(error))
2234 goto out;
2235 if (status != NFS3_OK)
2236 goto out_status;
2237 error = decode_fsinfo3resok(xdr, result);
2238 out:
2239 return error;
2240 out_status:
2241 return nfs3_stat_to_errno(status);
2242 }
2243
2244 /*
2245 * 3.3.20 PATHCONF3res
2246 *
2247 * struct PATHCONF3resok {
2248 * post_op_attr obj_attributes;
2249 * uint32 linkmax;
2250 * uint32 name_max;
2251 * bool no_trunc;
2252 * bool chown_restricted;
2253 * bool case_insensitive;
2254 * bool case_preserving;
2255 * };
2256 *
2257 * struct PATHCONF3resfail {
2258 * post_op_attr obj_attributes;
2259 * };
2260 *
2261 * union PATHCONF3res switch (nfsstat3 status) {
2262 * case NFS3_OK:
2263 * PATHCONF3resok resok;
2264 * default:
2265 * PATHCONF3resfail resfail;
2266 * };
2267 */
decode_pathconf3resok(struct xdr_stream * xdr,struct nfs_pathconf * result)2268 static int decode_pathconf3resok(struct xdr_stream *xdr,
2269 struct nfs_pathconf *result)
2270 {
2271 __be32 *p;
2272
2273 p = xdr_inline_decode(xdr, 4 * 6);
2274 if (unlikely(!p))
2275 return -EIO;
2276 result->max_link = be32_to_cpup(p++);
2277 result->max_namelen = be32_to_cpup(p);
2278 /* ignore remaining fields */
2279 return 0;
2280 }
2281
nfs3_xdr_dec_pathconf3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * data)2282 static int nfs3_xdr_dec_pathconf3res(struct rpc_rqst *req,
2283 struct xdr_stream *xdr,
2284 void *data)
2285 {
2286 struct nfs_pathconf *result = data;
2287 enum nfs_stat status;
2288 int error;
2289
2290 error = decode_nfsstat3(xdr, &status);
2291 if (unlikely(error))
2292 goto out;
2293 error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req));
2294 if (unlikely(error))
2295 goto out;
2296 if (status != NFS3_OK)
2297 goto out_status;
2298 error = decode_pathconf3resok(xdr, result);
2299 out:
2300 return error;
2301 out_status:
2302 return nfs3_stat_to_errno(status);
2303 }
2304
2305 /*
2306 * 3.3.21 COMMIT3res
2307 *
2308 * struct COMMIT3resok {
2309 * wcc_data file_wcc;
2310 * writeverf3 verf;
2311 * };
2312 *
2313 * struct COMMIT3resfail {
2314 * wcc_data file_wcc;
2315 * };
2316 *
2317 * union COMMIT3res switch (nfsstat3 status) {
2318 * case NFS3_OK:
2319 * COMMIT3resok resok;
2320 * default:
2321 * COMMIT3resfail resfail;
2322 * };
2323 */
nfs3_xdr_dec_commit3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * data)2324 static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req,
2325 struct xdr_stream *xdr,
2326 void *data)
2327 {
2328 struct nfs_commitres *result = data;
2329 struct nfs_writeverf *verf = result->verf;
2330 enum nfs_stat status;
2331 int error;
2332
2333 error = decode_nfsstat3(xdr, &status);
2334 if (unlikely(error))
2335 goto out;
2336 error = decode_wcc_data(xdr, result->fattr, rpc_rqst_userns(req));
2337 if (unlikely(error))
2338 goto out;
2339 result->op_status = status;
2340 if (status != NFS3_OK)
2341 goto out_status;
2342 error = decode_writeverf3(xdr, &verf->verifier);
2343 if (!error)
2344 verf->committed = NFS_FILE_SYNC;
2345 out:
2346 return error;
2347 out_status:
2348 return nfs3_stat_to_errno(status);
2349 }
2350
2351 #ifdef CONFIG_NFS_V3_ACL
2352
decode_getacl3resok(struct xdr_stream * xdr,struct nfs3_getaclres * result,struct user_namespace * userns)2353 static inline int decode_getacl3resok(struct xdr_stream *xdr,
2354 struct nfs3_getaclres *result,
2355 struct user_namespace *userns)
2356 {
2357 struct posix_acl **acl;
2358 unsigned int *aclcnt;
2359 size_t hdrlen;
2360 int error;
2361
2362 error = decode_post_op_attr(xdr, result->fattr, userns);
2363 if (unlikely(error))
2364 goto out;
2365 error = decode_uint32(xdr, &result->mask);
2366 if (unlikely(error))
2367 goto out;
2368 error = -EINVAL;
2369 if (result->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
2370 goto out;
2371
2372 hdrlen = xdr_stream_pos(xdr);
2373
2374 acl = NULL;
2375 if (result->mask & NFS_ACL)
2376 acl = &result->acl_access;
2377 aclcnt = NULL;
2378 if (result->mask & NFS_ACLCNT)
2379 aclcnt = &result->acl_access_count;
2380 error = nfsacl_decode(xdr->buf, hdrlen, aclcnt, acl);
2381 if (unlikely(error <= 0))
2382 goto out;
2383
2384 acl = NULL;
2385 if (result->mask & NFS_DFACL)
2386 acl = &result->acl_default;
2387 aclcnt = NULL;
2388 if (result->mask & NFS_DFACLCNT)
2389 aclcnt = &result->acl_default_count;
2390 error = nfsacl_decode(xdr->buf, hdrlen + error, aclcnt, acl);
2391 if (unlikely(error <= 0))
2392 return error;
2393 error = 0;
2394 out:
2395 return error;
2396 }
2397
nfs3_xdr_dec_getacl3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * result)2398 static int nfs3_xdr_dec_getacl3res(struct rpc_rqst *req,
2399 struct xdr_stream *xdr,
2400 void *result)
2401 {
2402 enum nfs_stat status;
2403 int error;
2404
2405 error = decode_nfsstat3(xdr, &status);
2406 if (unlikely(error))
2407 goto out;
2408 if (status != NFS3_OK)
2409 goto out_default;
2410 error = decode_getacl3resok(xdr, result, rpc_rqst_userns(req));
2411 out:
2412 return error;
2413 out_default:
2414 return nfs3_stat_to_errno(status);
2415 }
2416
nfs3_xdr_dec_setacl3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * result)2417 static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req,
2418 struct xdr_stream *xdr,
2419 void *result)
2420 {
2421 enum nfs_stat status;
2422 int error;
2423
2424 error = decode_nfsstat3(xdr, &status);
2425 if (unlikely(error))
2426 goto out;
2427 if (status != NFS3_OK)
2428 goto out_default;
2429 error = decode_post_op_attr(xdr, result, rpc_rqst_userns(req));
2430 out:
2431 return error;
2432 out_default:
2433 return nfs3_stat_to_errno(status);
2434 }
2435
2436 #endif /* CONFIG_NFS_V3_ACL */
2437
2438
2439 /*
2440 * We need to translate between nfs status return values and
2441 * the local errno values which may not be the same.
2442 */
2443 static const struct {
2444 int stat;
2445 int errno;
2446 } nfs_errtbl[] = {
2447 { NFS_OK, 0 },
2448 { NFSERR_PERM, -EPERM },
2449 { NFSERR_NOENT, -ENOENT },
2450 { NFSERR_IO, -errno_NFSERR_IO},
2451 { NFSERR_NXIO, -ENXIO },
2452 /* { NFSERR_EAGAIN, -EAGAIN }, */
2453 { NFSERR_ACCES, -EACCES },
2454 { NFSERR_EXIST, -EEXIST },
2455 { NFSERR_XDEV, -EXDEV },
2456 { NFSERR_NODEV, -ENODEV },
2457 { NFSERR_NOTDIR, -ENOTDIR },
2458 { NFSERR_ISDIR, -EISDIR },
2459 { NFSERR_INVAL, -EINVAL },
2460 { NFSERR_FBIG, -EFBIG },
2461 { NFSERR_NOSPC, -ENOSPC },
2462 { NFSERR_ROFS, -EROFS },
2463 { NFSERR_MLINK, -EMLINK },
2464 { NFSERR_NAMETOOLONG, -ENAMETOOLONG },
2465 { NFSERR_NOTEMPTY, -ENOTEMPTY },
2466 { NFSERR_DQUOT, -EDQUOT },
2467 { NFSERR_STALE, -ESTALE },
2468 { NFSERR_REMOTE, -EREMOTE },
2469 #ifdef EWFLUSH
2470 { NFSERR_WFLUSH, -EWFLUSH },
2471 #endif
2472 { NFSERR_BADHANDLE, -EBADHANDLE },
2473 { NFSERR_NOT_SYNC, -ENOTSYNC },
2474 { NFSERR_BAD_COOKIE, -EBADCOOKIE },
2475 { NFSERR_NOTSUPP, -ENOTSUPP },
2476 { NFSERR_TOOSMALL, -ETOOSMALL },
2477 { NFSERR_SERVERFAULT, -EREMOTEIO },
2478 { NFSERR_BADTYPE, -EBADTYPE },
2479 { NFSERR_JUKEBOX, -EJUKEBOX },
2480 { -1, -EIO }
2481 };
2482
2483 /**
2484 * nfs3_stat_to_errno - convert an NFS status code to a local errno
2485 * @status: NFS status code to convert
2486 *
2487 * Returns a local errno value, or -EIO if the NFS status code is
2488 * not recognized. This function is used jointly by NFSv2 and NFSv3.
2489 */
nfs3_stat_to_errno(enum nfs_stat status)2490 static int nfs3_stat_to_errno(enum nfs_stat status)
2491 {
2492 int i;
2493
2494 for (i = 0; nfs_errtbl[i].stat != -1; i++) {
2495 if (nfs_errtbl[i].stat == (int)status)
2496 return nfs_errtbl[i].errno;
2497 }
2498 dprintk("NFS: Unrecognized nfs status value: %u\n", status);
2499 return nfs_errtbl[i].errno;
2500 }
2501
2502
2503 #define PROC(proc, argtype, restype, timer) \
2504 [NFS3PROC_##proc] = { \
2505 .p_proc = NFS3PROC_##proc, \
2506 .p_encode = nfs3_xdr_enc_##argtype##3args, \
2507 .p_decode = nfs3_xdr_dec_##restype##3res, \
2508 .p_arglen = NFS3_##argtype##args_sz, \
2509 .p_replen = NFS3_##restype##res_sz, \
2510 .p_timer = timer, \
2511 .p_statidx = NFS3PROC_##proc, \
2512 .p_name = #proc, \
2513 }
2514
2515 const struct rpc_procinfo nfs3_procedures[] = {
2516 PROC(GETATTR, getattr, getattr, 1),
2517 PROC(SETATTR, setattr, setattr, 0),
2518 PROC(LOOKUP, lookup, lookup, 2),
2519 PROC(ACCESS, access, access, 1),
2520 PROC(READLINK, readlink, readlink, 3),
2521 PROC(READ, read, read, 3),
2522 PROC(WRITE, write, write, 4),
2523 PROC(CREATE, create, create, 0),
2524 PROC(MKDIR, mkdir, create, 0),
2525 PROC(SYMLINK, symlink, create, 0),
2526 PROC(MKNOD, mknod, create, 0),
2527 PROC(REMOVE, remove, remove, 0),
2528 PROC(RMDIR, lookup, setattr, 0),
2529 PROC(RENAME, rename, rename, 0),
2530 PROC(LINK, link, link, 0),
2531 PROC(READDIR, readdir, readdir, 3),
2532 PROC(READDIRPLUS, readdirplus, readdir, 3),
2533 PROC(FSSTAT, getattr, fsstat, 0),
2534 PROC(FSINFO, getattr, fsinfo, 0),
2535 PROC(PATHCONF, getattr, pathconf, 0),
2536 PROC(COMMIT, commit, commit, 5),
2537 };
2538
2539 static unsigned int nfs_version3_counts[ARRAY_SIZE(nfs3_procedures)];
2540 const struct rpc_version nfs_version3 = {
2541 .number = 3,
2542 .nrprocs = ARRAY_SIZE(nfs3_procedures),
2543 .procs = nfs3_procedures,
2544 .counts = nfs_version3_counts,
2545 };
2546
2547 #ifdef CONFIG_NFS_V3_ACL
2548 static const struct rpc_procinfo nfs3_acl_procedures[] = {
2549 [ACLPROC3_GETACL] = {
2550 .p_proc = ACLPROC3_GETACL,
2551 .p_encode = nfs3_xdr_enc_getacl3args,
2552 .p_decode = nfs3_xdr_dec_getacl3res,
2553 .p_arglen = ACL3_getaclargs_sz,
2554 .p_replen = ACL3_getaclres_sz,
2555 .p_timer = 1,
2556 .p_name = "GETACL",
2557 },
2558 [ACLPROC3_SETACL] = {
2559 .p_proc = ACLPROC3_SETACL,
2560 .p_encode = nfs3_xdr_enc_setacl3args,
2561 .p_decode = nfs3_xdr_dec_setacl3res,
2562 .p_arglen = ACL3_setaclargs_sz,
2563 .p_replen = ACL3_setaclres_sz,
2564 .p_timer = 0,
2565 .p_name = "SETACL",
2566 },
2567 };
2568
2569 static unsigned int nfs3_acl_counts[ARRAY_SIZE(nfs3_acl_procedures)];
2570 const struct rpc_version nfsacl_version3 = {
2571 .number = 3,
2572 .nrprocs = ARRAY_SIZE(nfs3_acl_procedures),
2573 .procs = nfs3_acl_procedures,
2574 .counts = nfs3_acl_counts,
2575 };
2576 #endif /* CONFIG_NFS_V3_ACL */
2577