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_pagepad_sz (1) /* Page padding */
37#define NFS3_fhandle_sz (1+16)
38#define NFS3_fh_sz (NFS3_fhandle_sz) /* shorthand */
39#define NFS3_post_op_fh_sz (1+NFS3_fh_sz)
40#define NFS3_sattr_sz (15)
41#define NFS3_filename_sz (1+(NFS3_MAXNAMLEN>>2))
42#define NFS3_path_sz (1+(NFS3_MAXPATHLEN>>2))
43#define NFS3_fattr_sz (21)
44#define NFS3_cookieverf_sz (NFS3_COOKIEVERFSIZE>>2)
45#define NFS3_wcc_attr_sz (6)
46#define NFS3_pre_op_attr_sz (1+NFS3_wcc_attr_sz)
47#define NFS3_post_op_attr_sz (1+NFS3_fattr_sz)
48#define NFS3_wcc_data_sz (NFS3_pre_op_attr_sz+NFS3_post_op_attr_sz)
49#define NFS3_diropargs_sz (NFS3_fh_sz+NFS3_filename_sz)
50
51#define NFS3_getattrargs_sz (NFS3_fh_sz)
52#define NFS3_setattrargs_sz (NFS3_fh_sz+NFS3_sattr_sz+3)
53#define NFS3_lookupargs_sz (NFS3_fh_sz+NFS3_filename_sz)
54#define NFS3_accessargs_sz (NFS3_fh_sz+1)
55#define NFS3_readlinkargs_sz (NFS3_fh_sz)
56#define NFS3_readargs_sz (NFS3_fh_sz+3)
57#define NFS3_writeargs_sz (NFS3_fh_sz+5)
58#define NFS3_createargs_sz (NFS3_diropargs_sz+NFS3_sattr_sz)
59#define NFS3_mkdirargs_sz (NFS3_diropargs_sz+NFS3_sattr_sz)
60#define NFS3_symlinkargs_sz (NFS3_diropargs_sz+1+NFS3_sattr_sz)
61#define NFS3_mknodargs_sz (NFS3_diropargs_sz+2+NFS3_sattr_sz)
62#define NFS3_removeargs_sz (NFS3_fh_sz+NFS3_filename_sz)
63#define NFS3_renameargs_sz (NFS3_diropargs_sz+NFS3_diropargs_sz)
64#define NFS3_linkargs_sz (NFS3_fh_sz+NFS3_diropargs_sz)
65#define NFS3_readdirargs_sz (NFS3_fh_sz+NFS3_cookieverf_sz+3)
66#define NFS3_readdirplusargs_sz (NFS3_fh_sz+NFS3_cookieverf_sz+4)
67#define NFS3_commitargs_sz (NFS3_fh_sz+3)
68
69#define NFS3_getattrres_sz (1+NFS3_fattr_sz)
70#define NFS3_setattrres_sz (1+NFS3_wcc_data_sz)
71#define NFS3_removeres_sz (NFS3_setattrres_sz)
72#define NFS3_lookupres_sz (1+NFS3_fh_sz+(2 * NFS3_post_op_attr_sz))
73#define NFS3_accessres_sz (1+NFS3_post_op_attr_sz+1)
74#define NFS3_readlinkres_sz (1+NFS3_post_op_attr_sz+1+NFS3_pagepad_sz)
75#define NFS3_readres_sz (1+NFS3_post_op_attr_sz+3+NFS3_pagepad_sz)
76#define NFS3_writeres_sz (1+NFS3_wcc_data_sz+4)
77#define NFS3_createres_sz (1+NFS3_post_op_fh_sz+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
78#define NFS3_renameres_sz (1+(2 * NFS3_wcc_data_sz))
79#define NFS3_linkres_sz (1+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
80#define NFS3_readdirres_sz (1+NFS3_post_op_attr_sz+2+NFS3_pagepad_sz)
81#define NFS3_fsstatres_sz (1+NFS3_post_op_attr_sz+13)
82#define NFS3_fsinfores_sz (1+NFS3_post_op_attr_sz+12)
83#define NFS3_pathconfres_sz (1+NFS3_post_op_attr_sz+6)
84#define NFS3_commitres_sz (1+NFS3_wcc_data_sz+2)
85
86#define ACL3_getaclargs_sz (NFS3_fh_sz+1)
87#define ACL3_setaclargs_sz (NFS3_fh_sz+1+ \
88 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
89#define ACL3_getaclres_sz (1+NFS3_post_op_attr_sz+1+ \
90 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE)+\
91 NFS3_pagepad_sz)
92#define ACL3_setaclres_sz (1+NFS3_post_op_attr_sz)
93
94static int nfs3_stat_to_errno(enum nfs_stat);
95
96/*
97 * Map file type to S_IFMT bits
98 */
99static const umode_t nfs_type2fmt[] = {
100 [NF3BAD] = 0,
101 [NF3REG] = S_IFREG,
102 [NF3DIR] = S_IFDIR,
103 [NF3BLK] = S_IFBLK,
104 [NF3CHR] = S_IFCHR,
105 [NF3LNK] = S_IFLNK,
106 [NF3SOCK] = S_IFSOCK,
107 [NF3FIFO] = S_IFIFO,
108};
109
110static struct user_namespace *rpc_userns(const struct rpc_clnt *clnt)
111{
112 if (clnt && clnt->cl_cred)
113 return clnt->cl_cred->user_ns;
114 return &init_user_ns;
115}
116
117static struct user_namespace *rpc_rqst_userns(const struct rpc_rqst *rqstp)
118{
119 if (rqstp->rq_task)
120 return rpc_userns(clnt: rqstp->rq_task->tk_client);
121 return &init_user_ns;
122}
123
124/*
125 * Encode/decode NFSv3 basic data types
126 *
127 * Basic NFSv3 data types are defined in section 2.5 of RFC 1813:
128 * "NFS Version 3 Protocol Specification".
129 *
130 * Not all basic data types have their own encoding and decoding
131 * functions. For run-time efficiency, some data types are encoded
132 * or decoded inline.
133 */
134
135static void encode_uint32(struct xdr_stream *xdr, u32 value)
136{
137 __be32 *p = xdr_reserve_space(xdr, nbytes: 4);
138 *p = cpu_to_be32(value);
139}
140
141static int decode_uint32(struct xdr_stream *xdr, u32 *value)
142{
143 __be32 *p;
144
145 p = xdr_inline_decode(xdr, nbytes: 4);
146 if (unlikely(!p))
147 return -EIO;
148 *value = be32_to_cpup(p);
149 return 0;
150}
151
152static int decode_uint64(struct xdr_stream *xdr, u64 *value)
153{
154 __be32 *p;
155
156 p = xdr_inline_decode(xdr, nbytes: 8);
157 if (unlikely(!p))
158 return -EIO;
159 xdr_decode_hyper(p, valp: value);
160 return 0;
161}
162
163/*
164 * fileid3
165 *
166 * typedef uint64 fileid3;
167 */
168static __be32 *xdr_decode_fileid3(__be32 *p, u64 *fileid)
169{
170 return xdr_decode_hyper(p, valp: fileid);
171}
172
173static int decode_fileid3(struct xdr_stream *xdr, u64 *fileid)
174{
175 return decode_uint64(xdr, value: fileid);
176}
177
178/*
179 * filename3
180 *
181 * typedef string filename3<>;
182 */
183static void encode_filename3(struct xdr_stream *xdr,
184 const char *name, u32 length)
185{
186 __be32 *p;
187
188 WARN_ON_ONCE(length > NFS3_MAXNAMLEN);
189 p = xdr_reserve_space(xdr, nbytes: 4 + length);
190 xdr_encode_opaque(p, ptr: name, len: length);
191}
192
193static int decode_inline_filename3(struct xdr_stream *xdr,
194 const char **name, u32 *length)
195{
196 __be32 *p;
197 u32 count;
198
199 p = xdr_inline_decode(xdr, nbytes: 4);
200 if (unlikely(!p))
201 return -EIO;
202 count = be32_to_cpup(p);
203 if (count > NFS3_MAXNAMLEN)
204 goto out_nametoolong;
205 p = xdr_inline_decode(xdr, nbytes: count);
206 if (unlikely(!p))
207 return -EIO;
208 *name = (const char *)p;
209 *length = count;
210 return 0;
211
212out_nametoolong:
213 dprintk("NFS: returned filename too long: %u\n", count);
214 return -ENAMETOOLONG;
215}
216
217/*
218 * nfspath3
219 *
220 * typedef string nfspath3<>;
221 */
222static void encode_nfspath3(struct xdr_stream *xdr, struct page **pages,
223 const u32 length)
224{
225 encode_uint32(xdr, value: length);
226 xdr_write_pages(xdr, pages, base: 0, len: length);
227}
228
229static int decode_nfspath3(struct xdr_stream *xdr)
230{
231 u32 recvd, count;
232 __be32 *p;
233
234 p = xdr_inline_decode(xdr, nbytes: 4);
235 if (unlikely(!p))
236 return -EIO;
237 count = be32_to_cpup(p);
238 if (unlikely(count >= xdr->buf->page_len || count > NFS3_MAXPATHLEN))
239 goto out_nametoolong;
240 recvd = xdr_read_pages(xdr, len: count);
241 if (unlikely(count > recvd))
242 goto out_cheating;
243 xdr_terminate_string(xdr->buf, count);
244 return 0;
245
246out_nametoolong:
247 dprintk("NFS: returned pathname too long: %u\n", count);
248 return -ENAMETOOLONG;
249out_cheating:
250 dprintk("NFS: server cheating in pathname result: "
251 "count %u > recvd %u\n", count, recvd);
252 return -EIO;
253}
254
255/*
256 * cookie3
257 *
258 * typedef uint64 cookie3
259 */
260static __be32 *xdr_encode_cookie3(__be32 *p, u64 cookie)
261{
262 return xdr_encode_hyper(p, val: cookie);
263}
264
265static int decode_cookie3(struct xdr_stream *xdr, u64 *cookie)
266{
267 return decode_uint64(xdr, value: cookie);
268}
269
270/*
271 * cookieverf3
272 *
273 * typedef opaque cookieverf3[NFS3_COOKIEVERFSIZE];
274 */
275static __be32 *xdr_encode_cookieverf3(__be32 *p, const __be32 *verifier)
276{
277 memcpy(p, verifier, NFS3_COOKIEVERFSIZE);
278 return p + XDR_QUADLEN(NFS3_COOKIEVERFSIZE);
279}
280
281static int decode_cookieverf3(struct xdr_stream *xdr, __be32 *verifier)
282{
283 __be32 *p;
284
285 p = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE);
286 if (unlikely(!p))
287 return -EIO;
288 memcpy(verifier, p, NFS3_COOKIEVERFSIZE);
289 return 0;
290}
291
292/*
293 * createverf3
294 *
295 * typedef opaque createverf3[NFS3_CREATEVERFSIZE];
296 */
297static void encode_createverf3(struct xdr_stream *xdr, const __be32 *verifier)
298{
299 __be32 *p;
300
301 p = xdr_reserve_space(xdr, NFS3_CREATEVERFSIZE);
302 memcpy(p, verifier, NFS3_CREATEVERFSIZE);
303}
304
305static int decode_writeverf3(struct xdr_stream *xdr, struct nfs_write_verifier *verifier)
306{
307 __be32 *p;
308
309 p = xdr_inline_decode(xdr, NFS3_WRITEVERFSIZE);
310 if (unlikely(!p))
311 return -EIO;
312 memcpy(verifier->data, p, NFS3_WRITEVERFSIZE);
313 return 0;
314}
315
316/*
317 * size3
318 *
319 * typedef uint64 size3;
320 */
321static __be32 *xdr_decode_size3(__be32 *p, u64 *size)
322{
323 return xdr_decode_hyper(p, valp: size);
324}
325
326/*
327 * nfsstat3
328 *
329 * enum nfsstat3 {
330 * NFS3_OK = 0,
331 * ...
332 * }
333 */
334#define NFS3_OK NFS_OK
335
336static int decode_nfsstat3(struct xdr_stream *xdr, enum nfs_stat *status)
337{
338 __be32 *p;
339
340 p = xdr_inline_decode(xdr, nbytes: 4);
341 if (unlikely(!p))
342 return -EIO;
343 if (unlikely(*p != cpu_to_be32(NFS3_OK)))
344 goto out_status;
345 *status = 0;
346 return 0;
347out_status:
348 *status = be32_to_cpup(p);
349 trace_nfs_xdr_status(xdr, error: (int)*status);
350 return 0;
351}
352
353/*
354 * ftype3
355 *
356 * enum ftype3 {
357 * NF3REG = 1,
358 * NF3DIR = 2,
359 * NF3BLK = 3,
360 * NF3CHR = 4,
361 * NF3LNK = 5,
362 * NF3SOCK = 6,
363 * NF3FIFO = 7
364 * };
365 */
366static void encode_ftype3(struct xdr_stream *xdr, const u32 type)
367{
368 encode_uint32(xdr, value: type);
369}
370
371static __be32 *xdr_decode_ftype3(__be32 *p, umode_t *mode)
372{
373 u32 type;
374
375 type = be32_to_cpup(p: p++);
376 if (type > NF3FIFO)
377 type = NF3NON;
378 *mode = nfs_type2fmt[type];
379 return p;
380}
381
382/*
383 * specdata3
384 *
385 * struct specdata3 {
386 * uint32 specdata1;
387 * uint32 specdata2;
388 * };
389 */
390static void encode_specdata3(struct xdr_stream *xdr, const dev_t rdev)
391{
392 __be32 *p;
393
394 p = xdr_reserve_space(xdr, nbytes: 8);
395 *p++ = cpu_to_be32(MAJOR(rdev));
396 *p = cpu_to_be32(MINOR(rdev));
397}
398
399static __be32 *xdr_decode_specdata3(__be32 *p, dev_t *rdev)
400{
401 unsigned int major, minor;
402
403 major = be32_to_cpup(p: p++);
404 minor = be32_to_cpup(p: p++);
405 *rdev = MKDEV(major, minor);
406 if (MAJOR(*rdev) != major || MINOR(*rdev) != minor)
407 *rdev = 0;
408 return p;
409}
410
411/*
412 * nfs_fh3
413 *
414 * struct nfs_fh3 {
415 * opaque data<NFS3_FHSIZE>;
416 * };
417 */
418static void encode_nfs_fh3(struct xdr_stream *xdr, const struct nfs_fh *fh)
419{
420 __be32 *p;
421
422 WARN_ON_ONCE(fh->size > NFS3_FHSIZE);
423 p = xdr_reserve_space(xdr, nbytes: 4 + fh->size);
424 xdr_encode_opaque(p, ptr: fh->data, len: fh->size);
425}
426
427static int decode_nfs_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
428{
429 u32 length;
430 __be32 *p;
431
432 p = xdr_inline_decode(xdr, nbytes: 4);
433 if (unlikely(!p))
434 return -EIO;
435 length = be32_to_cpup(p: p++);
436 if (unlikely(length > NFS3_FHSIZE || length == 0))
437 goto out_toobig;
438 p = xdr_inline_decode(xdr, nbytes: length);
439 if (unlikely(!p))
440 return -EIO;
441 fh->size = length;
442 memcpy(fh->data, p, length);
443 return 0;
444out_toobig:
445 trace_nfs_xdr_bad_filehandle(xdr, error: NFSERR_BADHANDLE);
446 return -E2BIG;
447}
448
449static void zero_nfs_fh3(struct nfs_fh *fh)
450{
451 memset(fh, 0, sizeof(*fh));
452}
453
454/*
455 * nfstime3
456 *
457 * struct nfstime3 {
458 * uint32 seconds;
459 * uint32 nseconds;
460 * };
461 */
462static __be32 *xdr_encode_nfstime3(__be32 *p, const struct timespec64 *timep)
463{
464 *p++ = cpu_to_be32((u32)timep->tv_sec);
465 *p++ = cpu_to_be32(timep->tv_nsec);
466 return p;
467}
468
469static __be32 *xdr_decode_nfstime3(__be32 *p, struct timespec64 *timep)
470{
471 timep->tv_sec = be32_to_cpup(p: p++);
472 timep->tv_nsec = be32_to_cpup(p: p++);
473 return p;
474}
475
476/*
477 * sattr3
478 *
479 * enum time_how {
480 * DONT_CHANGE = 0,
481 * SET_TO_SERVER_TIME = 1,
482 * SET_TO_CLIENT_TIME = 2
483 * };
484 *
485 * union set_mode3 switch (bool set_it) {
486 * case TRUE:
487 * mode3 mode;
488 * default:
489 * void;
490 * };
491 *
492 * union set_uid3 switch (bool set_it) {
493 * case TRUE:
494 * uid3 uid;
495 * default:
496 * void;
497 * };
498 *
499 * union set_gid3 switch (bool set_it) {
500 * case TRUE:
501 * gid3 gid;
502 * default:
503 * void;
504 * };
505 *
506 * union set_size3 switch (bool set_it) {
507 * case TRUE:
508 * size3 size;
509 * default:
510 * void;
511 * };
512 *
513 * union set_atime switch (time_how set_it) {
514 * case SET_TO_CLIENT_TIME:
515 * nfstime3 atime;
516 * default:
517 * void;
518 * };
519 *
520 * union set_mtime switch (time_how set_it) {
521 * case SET_TO_CLIENT_TIME:
522 * nfstime3 mtime;
523 * default:
524 * void;
525 * };
526 *
527 * struct sattr3 {
528 * set_mode3 mode;
529 * set_uid3 uid;
530 * set_gid3 gid;
531 * set_size3 size;
532 * set_atime atime;
533 * set_mtime mtime;
534 * };
535 */
536static void encode_sattr3(struct xdr_stream *xdr, const struct iattr *attr,
537 struct user_namespace *userns)
538{
539 u32 nbytes;
540 __be32 *p;
541
542 /*
543 * In order to make only a single xdr_reserve_space() call,
544 * pre-compute the total number of bytes to be reserved.
545 * Six boolean values, one for each set_foo field, are always
546 * present in the encoded result, so start there.
547 */
548 nbytes = 6 * 4;
549 if (attr->ia_valid & ATTR_MODE)
550 nbytes += 4;
551 if (attr->ia_valid & ATTR_UID)
552 nbytes += 4;
553 if (attr->ia_valid & ATTR_GID)
554 nbytes += 4;
555 if (attr->ia_valid & ATTR_SIZE)
556 nbytes += 8;
557 if (attr->ia_valid & ATTR_ATIME_SET)
558 nbytes += 8;
559 if (attr->ia_valid & ATTR_MTIME_SET)
560 nbytes += 8;
561 p = xdr_reserve_space(xdr, nbytes);
562
563 if (attr->ia_valid & ATTR_MODE) {
564 *p++ = xdr_one;
565 *p++ = cpu_to_be32(attr->ia_mode & S_IALLUGO);
566 } else
567 *p++ = xdr_zero;
568
569 if (attr->ia_valid & ATTR_UID) {
570 *p++ = xdr_one;
571 *p++ = cpu_to_be32(from_kuid_munged(userns, attr->ia_uid));
572 } else
573 *p++ = xdr_zero;
574
575 if (attr->ia_valid & ATTR_GID) {
576 *p++ = xdr_one;
577 *p++ = cpu_to_be32(from_kgid_munged(userns, attr->ia_gid));
578 } else
579 *p++ = xdr_zero;
580
581 if (attr->ia_valid & ATTR_SIZE) {
582 *p++ = xdr_one;
583 p = xdr_encode_hyper(p, val: (u64)attr->ia_size);
584 } else
585 *p++ = xdr_zero;
586
587 if (attr->ia_valid & ATTR_ATIME_SET) {
588 *p++ = xdr_two;
589 p = xdr_encode_nfstime3(p, timep: &attr->ia_atime);
590 } else if (attr->ia_valid & ATTR_ATIME) {
591 *p++ = xdr_one;
592 } else
593 *p++ = xdr_zero;
594
595 if (attr->ia_valid & ATTR_MTIME_SET) {
596 *p++ = xdr_two;
597 xdr_encode_nfstime3(p, timep: &attr->ia_mtime);
598 } else if (attr->ia_valid & ATTR_MTIME) {
599 *p = xdr_one;
600 } else
601 *p = xdr_zero;
602}
603
604/*
605 * fattr3
606 *
607 * struct fattr3 {
608 * ftype3 type;
609 * mode3 mode;
610 * uint32 nlink;
611 * uid3 uid;
612 * gid3 gid;
613 * size3 size;
614 * size3 used;
615 * specdata3 rdev;
616 * uint64 fsid;
617 * fileid3 fileid;
618 * nfstime3 atime;
619 * nfstime3 mtime;
620 * nfstime3 ctime;
621 * };
622 */
623static int decode_fattr3(struct xdr_stream *xdr, struct nfs_fattr *fattr,
624 struct user_namespace *userns)
625{
626 umode_t fmode;
627 __be32 *p;
628
629 p = xdr_inline_decode(xdr, NFS3_fattr_sz << 2);
630 if (unlikely(!p))
631 return -EIO;
632
633 p = xdr_decode_ftype3(p, mode: &fmode);
634
635 fattr->mode = (be32_to_cpup(p: p++) & ~S_IFMT) | fmode;
636 fattr->nlink = be32_to_cpup(p: p++);
637 fattr->uid = make_kuid(from: userns, be32_to_cpup(p: p++));
638 if (!uid_valid(uid: fattr->uid))
639 goto out_uid;
640 fattr->gid = make_kgid(from: userns, be32_to_cpup(p: p++));
641 if (!gid_valid(gid: fattr->gid))
642 goto out_gid;
643
644 p = xdr_decode_size3(p, size: &fattr->size);
645 p = xdr_decode_size3(p, size: &fattr->du.nfs3.used);
646 p = xdr_decode_specdata3(p, rdev: &fattr->rdev);
647
648 p = xdr_decode_hyper(p, valp: &fattr->fsid.major);
649 fattr->fsid.minor = 0;
650
651 p = xdr_decode_fileid3(p, fileid: &fattr->fileid);
652 p = xdr_decode_nfstime3(p, timep: &fattr->atime);
653 p = xdr_decode_nfstime3(p, timep: &fattr->mtime);
654 xdr_decode_nfstime3(p, timep: &fattr->ctime);
655 fattr->change_attr = nfs_timespec_to_change_attr(ts: &fattr->ctime);
656
657 fattr->valid |= NFS_ATTR_FATTR_V3;
658 return 0;
659out_uid:
660 dprintk("NFS: returned invalid uid\n");
661 return -EINVAL;
662out_gid:
663 dprintk("NFS: returned invalid gid\n");
664 return -EINVAL;
665}
666
667/*
668 * post_op_attr
669 *
670 * union post_op_attr switch (bool attributes_follow) {
671 * case TRUE:
672 * fattr3 attributes;
673 * case FALSE:
674 * void;
675 * };
676 */
677static int decode_post_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr,
678 struct user_namespace *userns)
679{
680 __be32 *p;
681
682 p = xdr_inline_decode(xdr, nbytes: 4);
683 if (unlikely(!p))
684 return -EIO;
685 if (*p != xdr_zero)
686 return decode_fattr3(xdr, fattr, userns);
687 return 0;
688}
689
690/*
691 * wcc_attr
692 * struct wcc_attr {
693 * size3 size;
694 * nfstime3 mtime;
695 * nfstime3 ctime;
696 * };
697 */
698static int decode_wcc_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
699{
700 __be32 *p;
701
702 p = xdr_inline_decode(xdr, NFS3_wcc_attr_sz << 2);
703 if (unlikely(!p))
704 return -EIO;
705
706 fattr->valid |= NFS_ATTR_FATTR_PRESIZE
707 | NFS_ATTR_FATTR_PRECHANGE
708 | NFS_ATTR_FATTR_PREMTIME
709 | NFS_ATTR_FATTR_PRECTIME;
710
711 p = xdr_decode_size3(p, size: &fattr->pre_size);
712 p = xdr_decode_nfstime3(p, timep: &fattr->pre_mtime);
713 xdr_decode_nfstime3(p, timep: &fattr->pre_ctime);
714 fattr->pre_change_attr = nfs_timespec_to_change_attr(ts: &fattr->pre_ctime);
715
716 return 0;
717}
718
719/*
720 * pre_op_attr
721 * union pre_op_attr switch (bool attributes_follow) {
722 * case TRUE:
723 * wcc_attr attributes;
724 * case FALSE:
725 * void;
726 * };
727 *
728 * wcc_data
729 *
730 * struct wcc_data {
731 * pre_op_attr before;
732 * post_op_attr after;
733 * };
734 */
735static int decode_pre_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
736{
737 __be32 *p;
738
739 p = xdr_inline_decode(xdr, nbytes: 4);
740 if (unlikely(!p))
741 return -EIO;
742 if (*p != xdr_zero)
743 return decode_wcc_attr(xdr, fattr);
744 return 0;
745}
746
747static int decode_wcc_data(struct xdr_stream *xdr, struct nfs_fattr *fattr,
748 struct user_namespace *userns)
749{
750 int error;
751
752 error = decode_pre_op_attr(xdr, fattr);
753 if (unlikely(error))
754 goto out;
755 error = decode_post_op_attr(xdr, fattr, userns);
756out:
757 return error;
758}
759
760/*
761 * post_op_fh3
762 *
763 * union post_op_fh3 switch (bool handle_follows) {
764 * case TRUE:
765 * nfs_fh3 handle;
766 * case FALSE:
767 * void;
768 * };
769 */
770static int decode_post_op_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
771{
772 __be32 *p = xdr_inline_decode(xdr, nbytes: 4);
773 if (unlikely(!p))
774 return -EIO;
775 if (*p != xdr_zero)
776 return decode_nfs_fh3(xdr, fh);
777 zero_nfs_fh3(fh);
778 return 0;
779}
780
781/*
782 * diropargs3
783 *
784 * struct diropargs3 {
785 * nfs_fh3 dir;
786 * filename3 name;
787 * };
788 */
789static void encode_diropargs3(struct xdr_stream *xdr, const struct nfs_fh *fh,
790 const char *name, u32 length)
791{
792 encode_nfs_fh3(xdr, fh);
793 encode_filename3(xdr, name, length);
794}
795
796
797/*
798 * NFSv3 XDR encode functions
799 *
800 * NFSv3 argument types are defined in section 3.3 of RFC 1813:
801 * "NFS Version 3 Protocol Specification".
802 */
803
804/*
805 * 3.3.1 GETATTR3args
806 *
807 * struct GETATTR3args {
808 * nfs_fh3 object;
809 * };
810 */
811static void nfs3_xdr_enc_getattr3args(struct rpc_rqst *req,
812 struct xdr_stream *xdr,
813 const void *data)
814{
815 const struct nfs_fh *fh = data;
816
817 encode_nfs_fh3(xdr, fh);
818}
819
820/*
821 * 3.3.2 SETATTR3args
822 *
823 * union sattrguard3 switch (bool check) {
824 * case TRUE:
825 * nfstime3 obj_ctime;
826 * case FALSE:
827 * void;
828 * };
829 *
830 * struct SETATTR3args {
831 * nfs_fh3 object;
832 * sattr3 new_attributes;
833 * sattrguard3 guard;
834 * };
835 */
836static void encode_sattrguard3(struct xdr_stream *xdr,
837 const struct nfs3_sattrargs *args)
838{
839 __be32 *p;
840
841 if (args->guard) {
842 p = xdr_reserve_space(xdr, nbytes: 4 + 8);
843 *p++ = xdr_one;
844 xdr_encode_nfstime3(p, timep: &args->guardtime);
845 } else {
846 p = xdr_reserve_space(xdr, nbytes: 4);
847 *p = xdr_zero;
848 }
849}
850
851static void nfs3_xdr_enc_setattr3args(struct rpc_rqst *req,
852 struct xdr_stream *xdr,
853 const void *data)
854{
855 const struct nfs3_sattrargs *args = data;
856 encode_nfs_fh3(xdr, fh: args->fh);
857 encode_sattr3(xdr, attr: args->sattr, userns: rpc_rqst_userns(rqstp: req));
858 encode_sattrguard3(xdr, args);
859}
860
861/*
862 * 3.3.3 LOOKUP3args
863 *
864 * struct LOOKUP3args {
865 * diropargs3 what;
866 * };
867 */
868static void nfs3_xdr_enc_lookup3args(struct rpc_rqst *req,
869 struct xdr_stream *xdr,
870 const void *data)
871{
872 const struct nfs3_diropargs *args = data;
873
874 encode_diropargs3(xdr, fh: args->fh, name: args->name, length: args->len);
875}
876
877/*
878 * 3.3.4 ACCESS3args
879 *
880 * struct ACCESS3args {
881 * nfs_fh3 object;
882 * uint32 access;
883 * };
884 */
885static void encode_access3args(struct xdr_stream *xdr,
886 const struct nfs3_accessargs *args)
887{
888 encode_nfs_fh3(xdr, fh: args->fh);
889 encode_uint32(xdr, value: args->access);
890}
891
892static void nfs3_xdr_enc_access3args(struct rpc_rqst *req,
893 struct xdr_stream *xdr,
894 const void *data)
895{
896 const struct nfs3_accessargs *args = data;
897
898 encode_access3args(xdr, args);
899}
900
901/*
902 * 3.3.5 READLINK3args
903 *
904 * struct READLINK3args {
905 * nfs_fh3 symlink;
906 * };
907 */
908static void nfs3_xdr_enc_readlink3args(struct rpc_rqst *req,
909 struct xdr_stream *xdr,
910 const void *data)
911{
912 const struct nfs3_readlinkargs *args = data;
913
914 encode_nfs_fh3(xdr, fh: args->fh);
915 rpc_prepare_reply_pages(req, pages: args->pages, base: args->pgbase, len: args->pglen,
916 NFS3_readlinkres_sz - NFS3_pagepad_sz);
917}
918
919/*
920 * 3.3.6 READ3args
921 *
922 * struct READ3args {
923 * nfs_fh3 file;
924 * offset3 offset;
925 * count3 count;
926 * };
927 */
928static void encode_read3args(struct xdr_stream *xdr,
929 const struct nfs_pgio_args *args)
930{
931 __be32 *p;
932
933 encode_nfs_fh3(xdr, fh: args->fh);
934
935 p = xdr_reserve_space(xdr, nbytes: 8 + 4);
936 p = xdr_encode_hyper(p, val: args->offset);
937 *p = cpu_to_be32(args->count);
938}
939
940static void nfs3_xdr_enc_read3args(struct rpc_rqst *req,
941 struct xdr_stream *xdr,
942 const void *data)
943{
944 const struct nfs_pgio_args *args = data;
945 unsigned int replen = args->replen ? args->replen :
946 NFS3_readres_sz - NFS3_pagepad_sz;
947
948 encode_read3args(xdr, args);
949 rpc_prepare_reply_pages(req, pages: args->pages, base: args->pgbase,
950 len: args->count, hdrsize: replen);
951 req->rq_rcv_buf.flags |= XDRBUF_READ;
952}
953
954/*
955 * 3.3.7 WRITE3args
956 *
957 * enum stable_how {
958 * UNSTABLE = 0,
959 * DATA_SYNC = 1,
960 * FILE_SYNC = 2
961 * };
962 *
963 * struct WRITE3args {
964 * nfs_fh3 file;
965 * offset3 offset;
966 * count3 count;
967 * stable_how stable;
968 * opaque data<>;
969 * };
970 */
971static void encode_write3args(struct xdr_stream *xdr,
972 const struct nfs_pgio_args *args)
973{
974 __be32 *p;
975
976 encode_nfs_fh3(xdr, fh: args->fh);
977
978 p = xdr_reserve_space(xdr, nbytes: 8 + 4 + 4 + 4);
979 p = xdr_encode_hyper(p, val: args->offset);
980 *p++ = cpu_to_be32(args->count);
981 *p++ = cpu_to_be32(args->stable);
982 *p = cpu_to_be32(args->count);
983 xdr_write_pages(xdr, pages: args->pages, base: args->pgbase, len: args->count);
984}
985
986static void nfs3_xdr_enc_write3args(struct rpc_rqst *req,
987 struct xdr_stream *xdr,
988 const void *data)
989{
990 const struct nfs_pgio_args *args = data;
991
992 encode_write3args(xdr, args);
993 xdr->buf->flags |= XDRBUF_WRITE;
994}
995
996/*
997 * 3.3.8 CREATE3args
998 *
999 * enum createmode3 {
1000 * UNCHECKED = 0,
1001 * GUARDED = 1,
1002 * EXCLUSIVE = 2
1003 * };
1004 *
1005 * union createhow3 switch (createmode3 mode) {
1006 * case UNCHECKED:
1007 * case GUARDED:
1008 * sattr3 obj_attributes;
1009 * case EXCLUSIVE:
1010 * createverf3 verf;
1011 * };
1012 *
1013 * struct CREATE3args {
1014 * diropargs3 where;
1015 * createhow3 how;
1016 * };
1017 */
1018static void encode_createhow3(struct xdr_stream *xdr,
1019 const struct nfs3_createargs *args,
1020 struct user_namespace *userns)
1021{
1022 encode_uint32(xdr, value: args->createmode);
1023 switch (args->createmode) {
1024 case NFS3_CREATE_UNCHECKED:
1025 case NFS3_CREATE_GUARDED:
1026 encode_sattr3(xdr, attr: args->sattr, userns);
1027 break;
1028 case NFS3_CREATE_EXCLUSIVE:
1029 encode_createverf3(xdr, verifier: args->verifier);
1030 break;
1031 default:
1032 BUG();
1033 }
1034}
1035
1036static void nfs3_xdr_enc_create3args(struct rpc_rqst *req,
1037 struct xdr_stream *xdr,
1038 const void *data)
1039{
1040 const struct nfs3_createargs *args = data;
1041
1042 encode_diropargs3(xdr, fh: args->fh, name: args->name, length: args->len);
1043 encode_createhow3(xdr, args, userns: rpc_rqst_userns(rqstp: req));
1044}
1045
1046/*
1047 * 3.3.9 MKDIR3args
1048 *
1049 * struct MKDIR3args {
1050 * diropargs3 where;
1051 * sattr3 attributes;
1052 * };
1053 */
1054static void nfs3_xdr_enc_mkdir3args(struct rpc_rqst *req,
1055 struct xdr_stream *xdr,
1056 const void *data)
1057{
1058 const struct nfs3_mkdirargs *args = data;
1059
1060 encode_diropargs3(xdr, fh: args->fh, name: args->name, length: args->len);
1061 encode_sattr3(xdr, attr: args->sattr, userns: rpc_rqst_userns(rqstp: req));
1062}
1063
1064/*
1065 * 3.3.10 SYMLINK3args
1066 *
1067 * struct symlinkdata3 {
1068 * sattr3 symlink_attributes;
1069 * nfspath3 symlink_data;
1070 * };
1071 *
1072 * struct SYMLINK3args {
1073 * diropargs3 where;
1074 * symlinkdata3 symlink;
1075 * };
1076 */
1077static void encode_symlinkdata3(struct xdr_stream *xdr,
1078 const void *data,
1079 struct user_namespace *userns)
1080{
1081 const struct nfs3_symlinkargs *args = data;
1082
1083 encode_sattr3(xdr, attr: args->sattr, userns);
1084 encode_nfspath3(xdr, pages: args->pages, length: args->pathlen);
1085}
1086
1087static void nfs3_xdr_enc_symlink3args(struct rpc_rqst *req,
1088 struct xdr_stream *xdr,
1089 const void *data)
1090{
1091 const struct nfs3_symlinkargs *args = data;
1092
1093 encode_diropargs3(xdr, fh: args->fromfh, name: args->fromname, length: args->fromlen);
1094 encode_symlinkdata3(xdr, data: args, userns: rpc_rqst_userns(rqstp: req));
1095 xdr->buf->flags |= XDRBUF_WRITE;
1096}
1097
1098/*
1099 * 3.3.11 MKNOD3args
1100 *
1101 * struct devicedata3 {
1102 * sattr3 dev_attributes;
1103 * specdata3 spec;
1104 * };
1105 *
1106 * union mknoddata3 switch (ftype3 type) {
1107 * case NF3CHR:
1108 * case NF3BLK:
1109 * devicedata3 device;
1110 * case NF3SOCK:
1111 * case NF3FIFO:
1112 * sattr3 pipe_attributes;
1113 * default:
1114 * void;
1115 * };
1116 *
1117 * struct MKNOD3args {
1118 * diropargs3 where;
1119 * mknoddata3 what;
1120 * };
1121 */
1122static void encode_devicedata3(struct xdr_stream *xdr,
1123 const struct nfs3_mknodargs *args,
1124 struct user_namespace *userns)
1125{
1126 encode_sattr3(xdr, attr: args->sattr, userns);
1127 encode_specdata3(xdr, rdev: args->rdev);
1128}
1129
1130static void encode_mknoddata3(struct xdr_stream *xdr,
1131 const struct nfs3_mknodargs *args,
1132 struct user_namespace *userns)
1133{
1134 encode_ftype3(xdr, type: args->type);
1135 switch (args->type) {
1136 case NF3CHR:
1137 case NF3BLK:
1138 encode_devicedata3(xdr, args, userns);
1139 break;
1140 case NF3SOCK:
1141 case NF3FIFO:
1142 encode_sattr3(xdr, attr: args->sattr, userns);
1143 break;
1144 case NF3REG:
1145 case NF3DIR:
1146 break;
1147 default:
1148 BUG();
1149 }
1150}
1151
1152static void nfs3_xdr_enc_mknod3args(struct rpc_rqst *req,
1153 struct xdr_stream *xdr,
1154 const void *data)
1155{
1156 const struct nfs3_mknodargs *args = data;
1157
1158 encode_diropargs3(xdr, fh: args->fh, name: args->name, length: args->len);
1159 encode_mknoddata3(xdr, args, userns: rpc_rqst_userns(rqstp: req));
1160}
1161
1162/*
1163 * 3.3.12 REMOVE3args
1164 *
1165 * struct REMOVE3args {
1166 * diropargs3 object;
1167 * };
1168 */
1169static void nfs3_xdr_enc_remove3args(struct rpc_rqst *req,
1170 struct xdr_stream *xdr,
1171 const void *data)
1172{
1173 const struct nfs_removeargs *args = data;
1174
1175 encode_diropargs3(xdr, fh: args->fh, name: args->name.name, length: args->name.len);
1176}
1177
1178/*
1179 * 3.3.14 RENAME3args
1180 *
1181 * struct RENAME3args {
1182 * diropargs3 from;
1183 * diropargs3 to;
1184 * };
1185 */
1186static void nfs3_xdr_enc_rename3args(struct rpc_rqst *req,
1187 struct xdr_stream *xdr,
1188 const void *data)
1189{
1190 const struct nfs_renameargs *args = data;
1191 const struct qstr *old = args->old_name;
1192 const struct qstr *new = args->new_name;
1193
1194 encode_diropargs3(xdr, fh: args->old_dir, name: old->name, length: old->len);
1195 encode_diropargs3(xdr, fh: args->new_dir, name: new->name, length: new->len);
1196}
1197
1198/*
1199 * 3.3.15 LINK3args
1200 *
1201 * struct LINK3args {
1202 * nfs_fh3 file;
1203 * diropargs3 link;
1204 * };
1205 */
1206static void nfs3_xdr_enc_link3args(struct rpc_rqst *req,
1207 struct xdr_stream *xdr,
1208 const void *data)
1209{
1210 const struct nfs3_linkargs *args = data;
1211
1212 encode_nfs_fh3(xdr, fh: args->fromfh);
1213 encode_diropargs3(xdr, fh: args->tofh, name: args->toname, length: args->tolen);
1214}
1215
1216/*
1217 * 3.3.16 READDIR3args
1218 *
1219 * struct READDIR3args {
1220 * nfs_fh3 dir;
1221 * cookie3 cookie;
1222 * cookieverf3 cookieverf;
1223 * count3 count;
1224 * };
1225 */
1226static void encode_readdir3args(struct xdr_stream *xdr,
1227 const struct nfs3_readdirargs *args)
1228{
1229 __be32 *p;
1230
1231 encode_nfs_fh3(xdr, fh: args->fh);
1232
1233 p = xdr_reserve_space(xdr, nbytes: 8 + NFS3_COOKIEVERFSIZE + 4);
1234 p = xdr_encode_cookie3(p, cookie: args->cookie);
1235 p = xdr_encode_cookieverf3(p, verifier: args->verf);
1236 *p = cpu_to_be32(args->count);
1237}
1238
1239static void nfs3_xdr_enc_readdir3args(struct rpc_rqst *req,
1240 struct xdr_stream *xdr,
1241 const void *data)
1242{
1243 const struct nfs3_readdirargs *args = data;
1244
1245 encode_readdir3args(xdr, args);
1246 rpc_prepare_reply_pages(req, pages: args->pages, base: 0, len: args->count,
1247 NFS3_readdirres_sz - NFS3_pagepad_sz);
1248}
1249
1250/*
1251 * 3.3.17 READDIRPLUS3args
1252 *
1253 * struct READDIRPLUS3args {
1254 * nfs_fh3 dir;
1255 * cookie3 cookie;
1256 * cookieverf3 cookieverf;
1257 * count3 dircount;
1258 * count3 maxcount;
1259 * };
1260 */
1261static void encode_readdirplus3args(struct xdr_stream *xdr,
1262 const struct nfs3_readdirargs *args)
1263{
1264 uint32_t dircount = args->count;
1265 uint32_t maxcount = args->count;
1266 __be32 *p;
1267
1268 encode_nfs_fh3(xdr, fh: args->fh);
1269
1270 p = xdr_reserve_space(xdr, nbytes: 8 + NFS3_COOKIEVERFSIZE + 4 + 4);
1271 p = xdr_encode_cookie3(p, cookie: args->cookie);
1272 p = xdr_encode_cookieverf3(p, verifier: args->verf);
1273
1274 /*
1275 * readdirplus: need dircount + buffer size.
1276 * We just make sure we make dircount big enough
1277 */
1278 *p++ = cpu_to_be32(dircount);
1279 *p = cpu_to_be32(maxcount);
1280}
1281
1282static void nfs3_xdr_enc_readdirplus3args(struct rpc_rqst *req,
1283 struct xdr_stream *xdr,
1284 const void *data)
1285{
1286 const struct nfs3_readdirargs *args = data;
1287
1288 encode_readdirplus3args(xdr, args);
1289 rpc_prepare_reply_pages(req, pages: args->pages, base: 0, len: args->count,
1290 NFS3_readdirres_sz - NFS3_pagepad_sz);
1291}
1292
1293/*
1294 * 3.3.21 COMMIT3args
1295 *
1296 * struct COMMIT3args {
1297 * nfs_fh3 file;
1298 * offset3 offset;
1299 * count3 count;
1300 * };
1301 */
1302static void encode_commit3args(struct xdr_stream *xdr,
1303 const struct nfs_commitargs *args)
1304{
1305 __be32 *p;
1306
1307 encode_nfs_fh3(xdr, fh: args->fh);
1308
1309 p = xdr_reserve_space(xdr, nbytes: 8 + 4);
1310 p = xdr_encode_hyper(p, val: args->offset);
1311 *p = cpu_to_be32(args->count);
1312}
1313
1314static void nfs3_xdr_enc_commit3args(struct rpc_rqst *req,
1315 struct xdr_stream *xdr,
1316 const void *data)
1317{
1318 const struct nfs_commitargs *args = data;
1319
1320 encode_commit3args(xdr, args);
1321}
1322
1323#ifdef CONFIG_NFS_V3_ACL
1324
1325static void nfs3_xdr_enc_getacl3args(struct rpc_rqst *req,
1326 struct xdr_stream *xdr,
1327 const void *data)
1328{
1329 const struct nfs3_getaclargs *args = data;
1330
1331 encode_nfs_fh3(xdr, fh: args->fh);
1332 encode_uint32(xdr, value: args->mask);
1333 if (args->mask & (NFS_ACL | NFS_DFACL)) {
1334 rpc_prepare_reply_pages(req, pages: args->pages, base: 0,
1335 NFSACL_MAXPAGES << PAGE_SHIFT,
1336 ACL3_getaclres_sz - NFS3_pagepad_sz);
1337 req->rq_rcv_buf.flags |= XDRBUF_SPARSE_PAGES;
1338 }
1339}
1340
1341static void nfs3_xdr_enc_setacl3args(struct rpc_rqst *req,
1342 struct xdr_stream *xdr,
1343 const void *data)
1344{
1345 const struct nfs3_setaclargs *args = data;
1346 unsigned int base;
1347 int error;
1348
1349 encode_nfs_fh3(xdr, fh: NFS_FH(inode: args->inode));
1350 encode_uint32(xdr, value: args->mask);
1351
1352 base = req->rq_slen;
1353 if (args->npages != 0)
1354 xdr_write_pages(xdr, pages: args->pages, base: 0, len: args->len);
1355 else
1356 xdr_reserve_space(xdr, nbytes: args->len);
1357
1358 error = nfsacl_encode(buf: xdr->buf, base, inode: args->inode,
1359 acl: (args->mask & NFS_ACL) ?
1360 args->acl_access : NULL, encode_entries: 1, typeflag: 0);
1361 /* FIXME: this is just broken */
1362 BUG_ON(error < 0);
1363 error = nfsacl_encode(buf: xdr->buf, base: base + error, inode: args->inode,
1364 acl: (args->mask & NFS_DFACL) ?
1365 args->acl_default : NULL, encode_entries: 1,
1366 NFS_ACL_DEFAULT);
1367 BUG_ON(error < 0);
1368}
1369
1370#endif /* CONFIG_NFS_V3_ACL */
1371
1372/*
1373 * NFSv3 XDR decode functions
1374 *
1375 * NFSv3 result types are defined in section 3.3 of RFC 1813:
1376 * "NFS Version 3 Protocol Specification".
1377 */
1378
1379/*
1380 * 3.3.1 GETATTR3res
1381 *
1382 * struct GETATTR3resok {
1383 * fattr3 obj_attributes;
1384 * };
1385 *
1386 * union GETATTR3res switch (nfsstat3 status) {
1387 * case NFS3_OK:
1388 * GETATTR3resok resok;
1389 * default:
1390 * void;
1391 * };
1392 */
1393static int nfs3_xdr_dec_getattr3res(struct rpc_rqst *req,
1394 struct xdr_stream *xdr,
1395 void *result)
1396{
1397 enum nfs_stat status;
1398 int error;
1399
1400 error = decode_nfsstat3(xdr, status: &status);
1401 if (unlikely(error))
1402 goto out;
1403 if (status != NFS3_OK)
1404 goto out_default;
1405 error = decode_fattr3(xdr, fattr: result, userns: rpc_rqst_userns(rqstp: req));
1406out:
1407 return error;
1408out_default:
1409 return nfs3_stat_to_errno(status);
1410}
1411
1412/*
1413 * 3.3.2 SETATTR3res
1414 *
1415 * struct SETATTR3resok {
1416 * wcc_data obj_wcc;
1417 * };
1418 *
1419 * struct SETATTR3resfail {
1420 * wcc_data obj_wcc;
1421 * };
1422 *
1423 * union SETATTR3res switch (nfsstat3 status) {
1424 * case NFS3_OK:
1425 * SETATTR3resok resok;
1426 * default:
1427 * SETATTR3resfail resfail;
1428 * };
1429 */
1430static int nfs3_xdr_dec_setattr3res(struct rpc_rqst *req,
1431 struct xdr_stream *xdr,
1432 void *result)
1433{
1434 enum nfs_stat status;
1435 int error;
1436
1437 error = decode_nfsstat3(xdr, status: &status);
1438 if (unlikely(error))
1439 goto out;
1440 error = decode_wcc_data(xdr, fattr: result, userns: rpc_rqst_userns(rqstp: req));
1441 if (unlikely(error))
1442 goto out;
1443 if (status != NFS3_OK)
1444 goto out_status;
1445out:
1446 return error;
1447out_status:
1448 return nfs3_stat_to_errno(status);
1449}
1450
1451/*
1452 * 3.3.3 LOOKUP3res
1453 *
1454 * struct LOOKUP3resok {
1455 * nfs_fh3 object;
1456 * post_op_attr obj_attributes;
1457 * post_op_attr dir_attributes;
1458 * };
1459 *
1460 * struct LOOKUP3resfail {
1461 * post_op_attr dir_attributes;
1462 * };
1463 *
1464 * union LOOKUP3res switch (nfsstat3 status) {
1465 * case NFS3_OK:
1466 * LOOKUP3resok resok;
1467 * default:
1468 * LOOKUP3resfail resfail;
1469 * };
1470 */
1471static int nfs3_xdr_dec_lookup3res(struct rpc_rqst *req,
1472 struct xdr_stream *xdr,
1473 void *data)
1474{
1475 struct user_namespace *userns = rpc_rqst_userns(rqstp: req);
1476 struct nfs3_diropres *result = data;
1477 enum nfs_stat status;
1478 int error;
1479
1480 error = decode_nfsstat3(xdr, status: &status);
1481 if (unlikely(error))
1482 goto out;
1483 if (status != NFS3_OK)
1484 goto out_default;
1485 error = decode_nfs_fh3(xdr, fh: result->fh);
1486 if (unlikely(error))
1487 goto out;
1488 error = decode_post_op_attr(xdr, fattr: result->fattr, userns);
1489 if (unlikely(error))
1490 goto out;
1491 error = decode_post_op_attr(xdr, fattr: result->dir_attr, userns);
1492out:
1493 return error;
1494out_default:
1495 error = decode_post_op_attr(xdr, fattr: result->dir_attr, userns);
1496 if (unlikely(error))
1497 goto out;
1498 return nfs3_stat_to_errno(status);
1499}
1500
1501/*
1502 * 3.3.4 ACCESS3res
1503 *
1504 * struct ACCESS3resok {
1505 * post_op_attr obj_attributes;
1506 * uint32 access;
1507 * };
1508 *
1509 * struct ACCESS3resfail {
1510 * post_op_attr obj_attributes;
1511 * };
1512 *
1513 * union ACCESS3res switch (nfsstat3 status) {
1514 * case NFS3_OK:
1515 * ACCESS3resok resok;
1516 * default:
1517 * ACCESS3resfail resfail;
1518 * };
1519 */
1520static int nfs3_xdr_dec_access3res(struct rpc_rqst *req,
1521 struct xdr_stream *xdr,
1522 void *data)
1523{
1524 struct nfs3_accessres *result = data;
1525 enum nfs_stat status;
1526 int error;
1527
1528 error = decode_nfsstat3(xdr, status: &status);
1529 if (unlikely(error))
1530 goto out;
1531 error = decode_post_op_attr(xdr, fattr: result->fattr, userns: rpc_rqst_userns(rqstp: req));
1532 if (unlikely(error))
1533 goto out;
1534 if (status != NFS3_OK)
1535 goto out_default;
1536 error = decode_uint32(xdr, value: &result->access);
1537out:
1538 return error;
1539out_default:
1540 return nfs3_stat_to_errno(status);
1541}
1542
1543/*
1544 * 3.3.5 READLINK3res
1545 *
1546 * struct READLINK3resok {
1547 * post_op_attr symlink_attributes;
1548 * nfspath3 data;
1549 * };
1550 *
1551 * struct READLINK3resfail {
1552 * post_op_attr symlink_attributes;
1553 * };
1554 *
1555 * union READLINK3res switch (nfsstat3 status) {
1556 * case NFS3_OK:
1557 * READLINK3resok resok;
1558 * default:
1559 * READLINK3resfail resfail;
1560 * };
1561 */
1562static int nfs3_xdr_dec_readlink3res(struct rpc_rqst *req,
1563 struct xdr_stream *xdr,
1564 void *result)
1565{
1566 enum nfs_stat status;
1567 int error;
1568
1569 error = decode_nfsstat3(xdr, status: &status);
1570 if (unlikely(error))
1571 goto out;
1572 error = decode_post_op_attr(xdr, fattr: result, userns: rpc_rqst_userns(rqstp: req));
1573 if (unlikely(error))
1574 goto out;
1575 if (status != NFS3_OK)
1576 goto out_default;
1577 error = decode_nfspath3(xdr);
1578out:
1579 return error;
1580out_default:
1581 return nfs3_stat_to_errno(status);
1582}
1583
1584/*
1585 * 3.3.6 READ3res
1586 *
1587 * struct READ3resok {
1588 * post_op_attr file_attributes;
1589 * count3 count;
1590 * bool eof;
1591 * opaque data<>;
1592 * };
1593 *
1594 * struct READ3resfail {
1595 * post_op_attr file_attributes;
1596 * };
1597 *
1598 * union READ3res switch (nfsstat3 status) {
1599 * case NFS3_OK:
1600 * READ3resok resok;
1601 * default:
1602 * READ3resfail resfail;
1603 * };
1604 */
1605static int decode_read3resok(struct xdr_stream *xdr,
1606 struct nfs_pgio_res *result)
1607{
1608 u32 eof, count, ocount, recvd;
1609 __be32 *p;
1610
1611 p = xdr_inline_decode(xdr, nbytes: 4 + 4 + 4);
1612 if (unlikely(!p))
1613 return -EIO;
1614 count = be32_to_cpup(p: p++);
1615 eof = be32_to_cpup(p: p++);
1616 ocount = be32_to_cpup(p: p++);
1617 if (unlikely(ocount != count))
1618 goto out_mismatch;
1619 recvd = xdr_read_pages(xdr, len: count);
1620 if (unlikely(count > recvd))
1621 goto out_cheating;
1622out:
1623 result->eof = eof;
1624 result->count = count;
1625 return count;
1626out_mismatch:
1627 dprintk("NFS: READ count doesn't match length of opaque: "
1628 "count %u != ocount %u\n", count, ocount);
1629 return -EIO;
1630out_cheating:
1631 dprintk("NFS: server cheating in read result: "
1632 "count %u > recvd %u\n", count, recvd);
1633 count = recvd;
1634 eof = 0;
1635 goto out;
1636}
1637
1638static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1639 void *data)
1640{
1641 struct nfs_pgio_res *result = data;
1642 unsigned int pos;
1643 enum nfs_stat status;
1644 int error;
1645
1646 pos = xdr_stream_pos(xdr);
1647 error = decode_nfsstat3(xdr, status: &status);
1648 if (unlikely(error))
1649 goto out;
1650 error = decode_post_op_attr(xdr, fattr: result->fattr, userns: rpc_rqst_userns(rqstp: req));
1651 if (unlikely(error))
1652 goto out;
1653 result->op_status = status;
1654 if (status != NFS3_OK)
1655 goto out_status;
1656 result->replen = 3 + ((xdr_stream_pos(xdr) - pos) >> 2);
1657 error = decode_read3resok(xdr, result);
1658out:
1659 return error;
1660out_status:
1661 return nfs3_stat_to_errno(status);
1662}
1663
1664/*
1665 * 3.3.7 WRITE3res
1666 *
1667 * enum stable_how {
1668 * UNSTABLE = 0,
1669 * DATA_SYNC = 1,
1670 * FILE_SYNC = 2
1671 * };
1672 *
1673 * struct WRITE3resok {
1674 * wcc_data file_wcc;
1675 * count3 count;
1676 * stable_how committed;
1677 * writeverf3 verf;
1678 * };
1679 *
1680 * struct WRITE3resfail {
1681 * wcc_data file_wcc;
1682 * };
1683 *
1684 * union WRITE3res switch (nfsstat3 status) {
1685 * case NFS3_OK:
1686 * WRITE3resok resok;
1687 * default:
1688 * WRITE3resfail resfail;
1689 * };
1690 */
1691static int decode_write3resok(struct xdr_stream *xdr,
1692 struct nfs_pgio_res *result)
1693{
1694 __be32 *p;
1695
1696 p = xdr_inline_decode(xdr, nbytes: 4 + 4);
1697 if (unlikely(!p))
1698 return -EIO;
1699 result->count = be32_to_cpup(p: p++);
1700 result->verf->committed = be32_to_cpup(p: p++);
1701 if (unlikely(result->verf->committed > NFS_FILE_SYNC))
1702 goto out_badvalue;
1703 if (decode_writeverf3(xdr, verifier: &result->verf->verifier))
1704 return -EIO;
1705 return result->count;
1706out_badvalue:
1707 dprintk("NFS: bad stable_how value: %u\n", result->verf->committed);
1708 return -EIO;
1709}
1710
1711static int nfs3_xdr_dec_write3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1712 void *data)
1713{
1714 struct nfs_pgio_res *result = data;
1715 enum nfs_stat status;
1716 int error;
1717
1718 error = decode_nfsstat3(xdr, status: &status);
1719 if (unlikely(error))
1720 goto out;
1721 error = decode_wcc_data(xdr, fattr: result->fattr, userns: rpc_rqst_userns(rqstp: req));
1722 if (unlikely(error))
1723 goto out;
1724 result->op_status = status;
1725 if (status != NFS3_OK)
1726 goto out_status;
1727 error = decode_write3resok(xdr, result);
1728out:
1729 return error;
1730out_status:
1731 return nfs3_stat_to_errno(status);
1732}
1733
1734/*
1735 * 3.3.8 CREATE3res
1736 *
1737 * struct CREATE3resok {
1738 * post_op_fh3 obj;
1739 * post_op_attr obj_attributes;
1740 * wcc_data dir_wcc;
1741 * };
1742 *
1743 * struct CREATE3resfail {
1744 * wcc_data dir_wcc;
1745 * };
1746 *
1747 * union CREATE3res switch (nfsstat3 status) {
1748 * case NFS3_OK:
1749 * CREATE3resok resok;
1750 * default:
1751 * CREATE3resfail resfail;
1752 * };
1753 */
1754static int decode_create3resok(struct xdr_stream *xdr,
1755 struct nfs3_diropres *result,
1756 struct user_namespace *userns)
1757{
1758 int error;
1759
1760 error = decode_post_op_fh3(xdr, fh: result->fh);
1761 if (unlikely(error))
1762 goto out;
1763 error = decode_post_op_attr(xdr, fattr: result->fattr, userns);
1764 if (unlikely(error))
1765 goto out;
1766 /* The server isn't required to return a file handle.
1767 * If it didn't, force the client to perform a LOOKUP
1768 * to determine the correct file handle and attribute
1769 * values for the new object. */
1770 if (result->fh->size == 0)
1771 result->fattr->valid = 0;
1772 error = decode_wcc_data(xdr, fattr: result->dir_attr, userns);
1773out:
1774 return error;
1775}
1776
1777static int nfs3_xdr_dec_create3res(struct rpc_rqst *req,
1778 struct xdr_stream *xdr,
1779 void *data)
1780{
1781 struct user_namespace *userns = rpc_rqst_userns(rqstp: req);
1782 struct nfs3_diropres *result = data;
1783 enum nfs_stat status;
1784 int error;
1785
1786 error = decode_nfsstat3(xdr, status: &status);
1787 if (unlikely(error))
1788 goto out;
1789 if (status != NFS3_OK)
1790 goto out_default;
1791 error = decode_create3resok(xdr, result, userns);
1792out:
1793 return error;
1794out_default:
1795 error = decode_wcc_data(xdr, fattr: result->dir_attr, userns);
1796 if (unlikely(error))
1797 goto out;
1798 return nfs3_stat_to_errno(status);
1799}
1800
1801/*
1802 * 3.3.12 REMOVE3res
1803 *
1804 * struct REMOVE3resok {
1805 * wcc_data dir_wcc;
1806 * };
1807 *
1808 * struct REMOVE3resfail {
1809 * wcc_data dir_wcc;
1810 * };
1811 *
1812 * union REMOVE3res switch (nfsstat3 status) {
1813 * case NFS3_OK:
1814 * REMOVE3resok resok;
1815 * default:
1816 * REMOVE3resfail resfail;
1817 * };
1818 */
1819static int nfs3_xdr_dec_remove3res(struct rpc_rqst *req,
1820 struct xdr_stream *xdr,
1821 void *data)
1822{
1823 struct nfs_removeres *result = data;
1824 enum nfs_stat status;
1825 int error;
1826
1827 error = decode_nfsstat3(xdr, status: &status);
1828 if (unlikely(error))
1829 goto out;
1830 error = decode_wcc_data(xdr, fattr: result->dir_attr, userns: rpc_rqst_userns(rqstp: req));
1831 if (unlikely(error))
1832 goto out;
1833 if (status != NFS3_OK)
1834 goto out_status;
1835out:
1836 return error;
1837out_status:
1838 return nfs3_stat_to_errno(status);
1839}
1840
1841/*
1842 * 3.3.14 RENAME3res
1843 *
1844 * struct RENAME3resok {
1845 * wcc_data fromdir_wcc;
1846 * wcc_data todir_wcc;
1847 * };
1848 *
1849 * struct RENAME3resfail {
1850 * wcc_data fromdir_wcc;
1851 * wcc_data todir_wcc;
1852 * };
1853 *
1854 * union RENAME3res switch (nfsstat3 status) {
1855 * case NFS3_OK:
1856 * RENAME3resok resok;
1857 * default:
1858 * RENAME3resfail resfail;
1859 * };
1860 */
1861static int nfs3_xdr_dec_rename3res(struct rpc_rqst *req,
1862 struct xdr_stream *xdr,
1863 void *data)
1864{
1865 struct user_namespace *userns = rpc_rqst_userns(rqstp: req);
1866 struct nfs_renameres *result = data;
1867 enum nfs_stat status;
1868 int error;
1869
1870 error = decode_nfsstat3(xdr, status: &status);
1871 if (unlikely(error))
1872 goto out;
1873 error = decode_wcc_data(xdr, fattr: result->old_fattr, userns);
1874 if (unlikely(error))
1875 goto out;
1876 error = decode_wcc_data(xdr, fattr: result->new_fattr, userns);
1877 if (unlikely(error))
1878 goto out;
1879 if (status != NFS3_OK)
1880 goto out_status;
1881out:
1882 return error;
1883out_status:
1884 return nfs3_stat_to_errno(status);
1885}
1886
1887/*
1888 * 3.3.15 LINK3res
1889 *
1890 * struct LINK3resok {
1891 * post_op_attr file_attributes;
1892 * wcc_data linkdir_wcc;
1893 * };
1894 *
1895 * struct LINK3resfail {
1896 * post_op_attr file_attributes;
1897 * wcc_data linkdir_wcc;
1898 * };
1899 *
1900 * union LINK3res switch (nfsstat3 status) {
1901 * case NFS3_OK:
1902 * LINK3resok resok;
1903 * default:
1904 * LINK3resfail resfail;
1905 * };
1906 */
1907static int nfs3_xdr_dec_link3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1908 void *data)
1909{
1910 struct user_namespace *userns = rpc_rqst_userns(rqstp: req);
1911 struct nfs3_linkres *result = data;
1912 enum nfs_stat status;
1913 int error;
1914
1915 error = decode_nfsstat3(xdr, status: &status);
1916 if (unlikely(error))
1917 goto out;
1918 error = decode_post_op_attr(xdr, fattr: result->fattr, userns);
1919 if (unlikely(error))
1920 goto out;
1921 error = decode_wcc_data(xdr, fattr: result->dir_attr, userns);
1922 if (unlikely(error))
1923 goto out;
1924 if (status != NFS3_OK)
1925 goto out_status;
1926out:
1927 return error;
1928out_status:
1929 return nfs3_stat_to_errno(status);
1930}
1931
1932/**
1933 * nfs3_decode_dirent - Decode a single NFSv3 directory entry stored in
1934 * the local page cache
1935 * @xdr: XDR stream where entry resides
1936 * @entry: buffer to fill in with entry data
1937 * @plus: boolean indicating whether this should be a readdirplus entry
1938 *
1939 * Returns zero if successful, otherwise a negative errno value is
1940 * returned.
1941 *
1942 * This function is not invoked during READDIR reply decoding, but
1943 * rather whenever an application invokes the getdents(2) system call
1944 * on a directory already in our cache.
1945 *
1946 * 3.3.16 entry3
1947 *
1948 * struct entry3 {
1949 * fileid3 fileid;
1950 * filename3 name;
1951 * cookie3 cookie;
1952 * fhandle3 filehandle;
1953 * post_op_attr3 attributes;
1954 * entry3 *nextentry;
1955 * };
1956 *
1957 * 3.3.17 entryplus3
1958 * struct entryplus3 {
1959 * fileid3 fileid;
1960 * filename3 name;
1961 * cookie3 cookie;
1962 * post_op_attr name_attributes;
1963 * post_op_fh3 name_handle;
1964 * entryplus3 *nextentry;
1965 * };
1966 */
1967int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
1968 bool plus)
1969{
1970 struct user_namespace *userns = rpc_userns(clnt: entry->server->client);
1971 __be32 *p;
1972 int error;
1973 u64 new_cookie;
1974
1975 p = xdr_inline_decode(xdr, nbytes: 4);
1976 if (unlikely(!p))
1977 return -EAGAIN;
1978 if (*p == xdr_zero) {
1979 p = xdr_inline_decode(xdr, nbytes: 4);
1980 if (unlikely(!p))
1981 return -EAGAIN;
1982 if (*p == xdr_zero)
1983 return -EAGAIN;
1984 entry->eof = 1;
1985 return -EBADCOOKIE;
1986 }
1987
1988 error = decode_fileid3(xdr, fileid: &entry->ino);
1989 if (unlikely(error))
1990 return -EAGAIN;
1991
1992 error = decode_inline_filename3(xdr, name: &entry->name, length: &entry->len);
1993 if (unlikely(error))
1994 return error == -ENAMETOOLONG ? -ENAMETOOLONG : -EAGAIN;
1995
1996 error = decode_cookie3(xdr, cookie: &new_cookie);
1997 if (unlikely(error))
1998 return -EAGAIN;
1999
2000 entry->d_type = DT_UNKNOWN;
2001
2002 if (plus) {
2003 entry->fattr->valid = 0;
2004 error = decode_post_op_attr(xdr, fattr: entry->fattr, userns);
2005 if (unlikely(error))
2006 return -EAGAIN;
2007 if (entry->fattr->valid & NFS_ATTR_FATTR_V3)
2008 entry->d_type = nfs_umode_to_dtype(mode: entry->fattr->mode);
2009
2010 if (entry->fattr->fileid != entry->ino) {
2011 entry->fattr->mounted_on_fileid = entry->ino;
2012 entry->fattr->valid |= NFS_ATTR_FATTR_MOUNTED_ON_FILEID;
2013 }
2014
2015 /* In fact, a post_op_fh3: */
2016 p = xdr_inline_decode(xdr, nbytes: 4);
2017 if (unlikely(!p))
2018 return -EAGAIN;
2019 if (*p != xdr_zero) {
2020 error = decode_nfs_fh3(xdr, fh: entry->fh);
2021 if (unlikely(error))
2022 return -EAGAIN;
2023 } else
2024 zero_nfs_fh3(fh: entry->fh);
2025 }
2026
2027 entry->cookie = new_cookie;
2028
2029 return 0;
2030}
2031
2032/*
2033 * 3.3.16 READDIR3res
2034 *
2035 * struct dirlist3 {
2036 * entry3 *entries;
2037 * bool eof;
2038 * };
2039 *
2040 * struct READDIR3resok {
2041 * post_op_attr dir_attributes;
2042 * cookieverf3 cookieverf;
2043 * dirlist3 reply;
2044 * };
2045 *
2046 * struct READDIR3resfail {
2047 * post_op_attr dir_attributes;
2048 * };
2049 *
2050 * union READDIR3res switch (nfsstat3 status) {
2051 * case NFS3_OK:
2052 * READDIR3resok resok;
2053 * default:
2054 * READDIR3resfail resfail;
2055 * };
2056 *
2057 * Read the directory contents into the page cache, but otherwise
2058 * don't touch them. The actual decoding is done by nfs3_decode_entry()
2059 * during subsequent nfs_readdir() calls.
2060 */
2061static int decode_dirlist3(struct xdr_stream *xdr)
2062{
2063 return xdr_read_pages(xdr, len: xdr->buf->page_len);
2064}
2065
2066static int decode_readdir3resok(struct xdr_stream *xdr,
2067 struct nfs3_readdirres *result,
2068 struct user_namespace *userns)
2069{
2070 int error;
2071
2072 error = decode_post_op_attr(xdr, fattr: result->dir_attr, userns);
2073 if (unlikely(error))
2074 goto out;
2075 /* XXX: do we need to check if result->verf != NULL ? */
2076 error = decode_cookieverf3(xdr, verifier: result->verf);
2077 if (unlikely(error))
2078 goto out;
2079 error = decode_dirlist3(xdr);
2080out:
2081 return error;
2082}
2083
2084static int nfs3_xdr_dec_readdir3res(struct rpc_rqst *req,
2085 struct xdr_stream *xdr,
2086 void *data)
2087{
2088 struct nfs3_readdirres *result = data;
2089 enum nfs_stat status;
2090 int error;
2091
2092 error = decode_nfsstat3(xdr, status: &status);
2093 if (unlikely(error))
2094 goto out;
2095 if (status != NFS3_OK)
2096 goto out_default;
2097 error = decode_readdir3resok(xdr, result, userns: rpc_rqst_userns(rqstp: req));
2098out:
2099 return error;
2100out_default:
2101 error = decode_post_op_attr(xdr, fattr: result->dir_attr, userns: rpc_rqst_userns(rqstp: req));
2102 if (unlikely(error))
2103 goto out;
2104 return nfs3_stat_to_errno(status);
2105}
2106
2107/*
2108 * 3.3.18 FSSTAT3res
2109 *
2110 * struct FSSTAT3resok {
2111 * post_op_attr obj_attributes;
2112 * size3 tbytes;
2113 * size3 fbytes;
2114 * size3 abytes;
2115 * size3 tfiles;
2116 * size3 ffiles;
2117 * size3 afiles;
2118 * uint32 invarsec;
2119 * };
2120 *
2121 * struct FSSTAT3resfail {
2122 * post_op_attr obj_attributes;
2123 * };
2124 *
2125 * union FSSTAT3res switch (nfsstat3 status) {
2126 * case NFS3_OK:
2127 * FSSTAT3resok resok;
2128 * default:
2129 * FSSTAT3resfail resfail;
2130 * };
2131 */
2132static int decode_fsstat3resok(struct xdr_stream *xdr,
2133 struct nfs_fsstat *result)
2134{
2135 __be32 *p;
2136
2137 p = xdr_inline_decode(xdr, nbytes: 8 * 6 + 4);
2138 if (unlikely(!p))
2139 return -EIO;
2140 p = xdr_decode_size3(p, size: &result->tbytes);
2141 p = xdr_decode_size3(p, size: &result->fbytes);
2142 p = xdr_decode_size3(p, size: &result->abytes);
2143 p = xdr_decode_size3(p, size: &result->tfiles);
2144 p = xdr_decode_size3(p, size: &result->ffiles);
2145 xdr_decode_size3(p, size: &result->afiles);
2146 /* ignore invarsec */
2147 return 0;
2148}
2149
2150static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req,
2151 struct xdr_stream *xdr,
2152 void *data)
2153{
2154 struct nfs_fsstat *result = data;
2155 enum nfs_stat status;
2156 int error;
2157
2158 error = decode_nfsstat3(xdr, status: &status);
2159 if (unlikely(error))
2160 goto out;
2161 error = decode_post_op_attr(xdr, fattr: result->fattr, userns: rpc_rqst_userns(rqstp: req));
2162 if (unlikely(error))
2163 goto out;
2164 if (status != NFS3_OK)
2165 goto out_status;
2166 error = decode_fsstat3resok(xdr, result);
2167out:
2168 return error;
2169out_status:
2170 return nfs3_stat_to_errno(status);
2171}
2172
2173/*
2174 * 3.3.19 FSINFO3res
2175 *
2176 * struct FSINFO3resok {
2177 * post_op_attr obj_attributes;
2178 * uint32 rtmax;
2179 * uint32 rtpref;
2180 * uint32 rtmult;
2181 * uint32 wtmax;
2182 * uint32 wtpref;
2183 * uint32 wtmult;
2184 * uint32 dtpref;
2185 * size3 maxfilesize;
2186 * nfstime3 time_delta;
2187 * uint32 properties;
2188 * };
2189 *
2190 * struct FSINFO3resfail {
2191 * post_op_attr obj_attributes;
2192 * };
2193 *
2194 * union FSINFO3res switch (nfsstat3 status) {
2195 * case NFS3_OK:
2196 * FSINFO3resok resok;
2197 * default:
2198 * FSINFO3resfail resfail;
2199 * };
2200 */
2201static int decode_fsinfo3resok(struct xdr_stream *xdr,
2202 struct nfs_fsinfo *result)
2203{
2204 __be32 *p;
2205
2206 p = xdr_inline_decode(xdr, nbytes: 4 * 7 + 8 + 8 + 4);
2207 if (unlikely(!p))
2208 return -EIO;
2209 result->rtmax = be32_to_cpup(p: p++);
2210 result->rtpref = be32_to_cpup(p: p++);
2211 result->rtmult = be32_to_cpup(p: p++);
2212 result->wtmax = be32_to_cpup(p: p++);
2213 result->wtpref = be32_to_cpup(p: p++);
2214 result->wtmult = be32_to_cpup(p: p++);
2215 result->dtpref = be32_to_cpup(p: p++);
2216 p = xdr_decode_size3(p, size: &result->maxfilesize);
2217 xdr_decode_nfstime3(p, timep: &result->time_delta);
2218
2219 /* ignore properties */
2220 result->lease_time = 0;
2221 result->change_attr_type = NFS4_CHANGE_TYPE_IS_UNDEFINED;
2222 result->xattr_support = 0;
2223 return 0;
2224}
2225
2226static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req,
2227 struct xdr_stream *xdr,
2228 void *data)
2229{
2230 struct nfs_fsinfo *result = data;
2231 enum nfs_stat status;
2232 int error;
2233
2234 error = decode_nfsstat3(xdr, status: &status);
2235 if (unlikely(error))
2236 goto out;
2237 error = decode_post_op_attr(xdr, fattr: result->fattr, userns: rpc_rqst_userns(rqstp: req));
2238 if (unlikely(error))
2239 goto out;
2240 if (status != NFS3_OK)
2241 goto out_status;
2242 error = decode_fsinfo3resok(xdr, result);
2243out:
2244 return error;
2245out_status:
2246 return nfs3_stat_to_errno(status);
2247}
2248
2249/*
2250 * 3.3.20 PATHCONF3res
2251 *
2252 * struct PATHCONF3resok {
2253 * post_op_attr obj_attributes;
2254 * uint32 linkmax;
2255 * uint32 name_max;
2256 * bool no_trunc;
2257 * bool chown_restricted;
2258 * bool case_insensitive;
2259 * bool case_preserving;
2260 * };
2261 *
2262 * struct PATHCONF3resfail {
2263 * post_op_attr obj_attributes;
2264 * };
2265 *
2266 * union PATHCONF3res switch (nfsstat3 status) {
2267 * case NFS3_OK:
2268 * PATHCONF3resok resok;
2269 * default:
2270 * PATHCONF3resfail resfail;
2271 * };
2272 */
2273static int decode_pathconf3resok(struct xdr_stream *xdr,
2274 struct nfs_pathconf *result)
2275{
2276 __be32 *p;
2277
2278 p = xdr_inline_decode(xdr, nbytes: 4 * 6);
2279 if (unlikely(!p))
2280 return -EIO;
2281 result->max_link = be32_to_cpup(p: p++);
2282 result->max_namelen = be32_to_cpup(p);
2283 /* ignore remaining fields */
2284 return 0;
2285}
2286
2287static int nfs3_xdr_dec_pathconf3res(struct rpc_rqst *req,
2288 struct xdr_stream *xdr,
2289 void *data)
2290{
2291 struct nfs_pathconf *result = data;
2292 enum nfs_stat status;
2293 int error;
2294
2295 error = decode_nfsstat3(xdr, status: &status);
2296 if (unlikely(error))
2297 goto out;
2298 error = decode_post_op_attr(xdr, fattr: result->fattr, userns: rpc_rqst_userns(rqstp: req));
2299 if (unlikely(error))
2300 goto out;
2301 if (status != NFS3_OK)
2302 goto out_status;
2303 error = decode_pathconf3resok(xdr, result);
2304out:
2305 return error;
2306out_status:
2307 return nfs3_stat_to_errno(status);
2308}
2309
2310/*
2311 * 3.3.21 COMMIT3res
2312 *
2313 * struct COMMIT3resok {
2314 * wcc_data file_wcc;
2315 * writeverf3 verf;
2316 * };
2317 *
2318 * struct COMMIT3resfail {
2319 * wcc_data file_wcc;
2320 * };
2321 *
2322 * union COMMIT3res switch (nfsstat3 status) {
2323 * case NFS3_OK:
2324 * COMMIT3resok resok;
2325 * default:
2326 * COMMIT3resfail resfail;
2327 * };
2328 */
2329static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req,
2330 struct xdr_stream *xdr,
2331 void *data)
2332{
2333 struct nfs_commitres *result = data;
2334 struct nfs_writeverf *verf = result->verf;
2335 enum nfs_stat status;
2336 int error;
2337
2338 error = decode_nfsstat3(xdr, status: &status);
2339 if (unlikely(error))
2340 goto out;
2341 error = decode_wcc_data(xdr, fattr: result->fattr, userns: rpc_rqst_userns(rqstp: req));
2342 if (unlikely(error))
2343 goto out;
2344 result->op_status = status;
2345 if (status != NFS3_OK)
2346 goto out_status;
2347 error = decode_writeverf3(xdr, verifier: &verf->verifier);
2348 if (!error)
2349 verf->committed = NFS_FILE_SYNC;
2350out:
2351 return error;
2352out_status:
2353 return nfs3_stat_to_errno(status);
2354}
2355
2356#ifdef CONFIG_NFS_V3_ACL
2357
2358static inline int decode_getacl3resok(struct xdr_stream *xdr,
2359 struct nfs3_getaclres *result,
2360 struct user_namespace *userns)
2361{
2362 struct posix_acl **acl;
2363 unsigned int *aclcnt;
2364 size_t hdrlen;
2365 int error;
2366
2367 error = decode_post_op_attr(xdr, fattr: result->fattr, userns);
2368 if (unlikely(error))
2369 goto out;
2370 error = decode_uint32(xdr, value: &result->mask);
2371 if (unlikely(error))
2372 goto out;
2373 error = -EINVAL;
2374 if (result->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
2375 goto out;
2376
2377 hdrlen = xdr_stream_pos(xdr);
2378
2379 acl = NULL;
2380 if (result->mask & NFS_ACL)
2381 acl = &result->acl_access;
2382 aclcnt = NULL;
2383 if (result->mask & NFS_ACLCNT)
2384 aclcnt = &result->acl_access_count;
2385 error = nfsacl_decode(buf: xdr->buf, base: hdrlen, aclcnt, pacl: acl);
2386 if (unlikely(error <= 0))
2387 goto out;
2388
2389 acl = NULL;
2390 if (result->mask & NFS_DFACL)
2391 acl = &result->acl_default;
2392 aclcnt = NULL;
2393 if (result->mask & NFS_DFACLCNT)
2394 aclcnt = &result->acl_default_count;
2395 error = nfsacl_decode(buf: xdr->buf, base: hdrlen + error, aclcnt, pacl: acl);
2396 if (unlikely(error <= 0))
2397 return error;
2398 error = 0;
2399out:
2400 return error;
2401}
2402
2403static int nfs3_xdr_dec_getacl3res(struct rpc_rqst *req,
2404 struct xdr_stream *xdr,
2405 void *result)
2406{
2407 enum nfs_stat status;
2408 int error;
2409
2410 error = decode_nfsstat3(xdr, status: &status);
2411 if (unlikely(error))
2412 goto out;
2413 if (status != NFS3_OK)
2414 goto out_default;
2415 error = decode_getacl3resok(xdr, result, userns: rpc_rqst_userns(rqstp: req));
2416out:
2417 return error;
2418out_default:
2419 return nfs3_stat_to_errno(status);
2420}
2421
2422static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req,
2423 struct xdr_stream *xdr,
2424 void *result)
2425{
2426 enum nfs_stat status;
2427 int error;
2428
2429 error = decode_nfsstat3(xdr, status: &status);
2430 if (unlikely(error))
2431 goto out;
2432 if (status != NFS3_OK)
2433 goto out_default;
2434 error = decode_post_op_attr(xdr, fattr: result, userns: rpc_rqst_userns(rqstp: req));
2435out:
2436 return error;
2437out_default:
2438 return nfs3_stat_to_errno(status);
2439}
2440
2441#endif /* CONFIG_NFS_V3_ACL */
2442
2443
2444/*
2445 * We need to translate between nfs status return values and
2446 * the local errno values which may not be the same.
2447 */
2448static const struct {
2449 int stat;
2450 int errno;
2451} nfs_errtbl[] = {
2452 { NFS_OK, 0 },
2453 { NFSERR_PERM, -EPERM },
2454 { NFSERR_NOENT, -ENOENT },
2455 { NFSERR_IO, -errno_NFSERR_IO},
2456 { NFSERR_NXIO, -ENXIO },
2457/* { NFSERR_EAGAIN, -EAGAIN }, */
2458 { NFSERR_ACCES, -EACCES },
2459 { NFSERR_EXIST, -EEXIST },
2460 { NFSERR_XDEV, -EXDEV },
2461 { NFSERR_NODEV, -ENODEV },
2462 { NFSERR_NOTDIR, -ENOTDIR },
2463 { NFSERR_ISDIR, -EISDIR },
2464 { NFSERR_INVAL, -EINVAL },
2465 { NFSERR_FBIG, -EFBIG },
2466 { NFSERR_NOSPC, -ENOSPC },
2467 { NFSERR_ROFS, -EROFS },
2468 { NFSERR_MLINK, -EMLINK },
2469 { NFSERR_NAMETOOLONG, -ENAMETOOLONG },
2470 { NFSERR_NOTEMPTY, -ENOTEMPTY },
2471 { NFSERR_DQUOT, -EDQUOT },
2472 { NFSERR_STALE, -ESTALE },
2473 { NFSERR_REMOTE, -EREMOTE },
2474#ifdef EWFLUSH
2475 { NFSERR_WFLUSH, -EWFLUSH },
2476#endif
2477 { NFSERR_BADHANDLE, -EBADHANDLE },
2478 { NFSERR_NOT_SYNC, -ENOTSYNC },
2479 { NFSERR_BAD_COOKIE, -EBADCOOKIE },
2480 { NFSERR_NOTSUPP, -ENOTSUPP },
2481 { NFSERR_TOOSMALL, -ETOOSMALL },
2482 { NFSERR_SERVERFAULT, -EREMOTEIO },
2483 { NFSERR_BADTYPE, -EBADTYPE },
2484 { NFSERR_JUKEBOX, -EJUKEBOX },
2485 { -1, -EIO }
2486};
2487
2488/**
2489 * nfs3_stat_to_errno - convert an NFS status code to a local errno
2490 * @status: NFS status code to convert
2491 *
2492 * Returns a local errno value, or -EIO if the NFS status code is
2493 * not recognized. This function is used jointly by NFSv2 and NFSv3.
2494 */
2495static int nfs3_stat_to_errno(enum nfs_stat status)
2496{
2497 int i;
2498
2499 for (i = 0; nfs_errtbl[i].stat != -1; i++) {
2500 if (nfs_errtbl[i].stat == (int)status)
2501 return nfs_errtbl[i].errno;
2502 }
2503 dprintk("NFS: Unrecognized nfs status value: %u\n", status);
2504 return nfs_errtbl[i].errno;
2505}
2506
2507
2508#define PROC(proc, argtype, restype, timer) \
2509[NFS3PROC_##proc] = { \
2510 .p_proc = NFS3PROC_##proc, \
2511 .p_encode = nfs3_xdr_enc_##argtype##3args, \
2512 .p_decode = nfs3_xdr_dec_##restype##3res, \
2513 .p_arglen = NFS3_##argtype##args_sz, \
2514 .p_replen = NFS3_##restype##res_sz, \
2515 .p_timer = timer, \
2516 .p_statidx = NFS3PROC_##proc, \
2517 .p_name = #proc, \
2518 }
2519
2520const struct rpc_procinfo nfs3_procedures[] = {
2521 PROC(GETATTR, getattr, getattr, 1),
2522 PROC(SETATTR, setattr, setattr, 0),
2523 PROC(LOOKUP, lookup, lookup, 2),
2524 PROC(ACCESS, access, access, 1),
2525 PROC(READLINK, readlink, readlink, 3),
2526 PROC(READ, read, read, 3),
2527 PROC(WRITE, write, write, 4),
2528 PROC(CREATE, create, create, 0),
2529 PROC(MKDIR, mkdir, create, 0),
2530 PROC(SYMLINK, symlink, create, 0),
2531 PROC(MKNOD, mknod, create, 0),
2532 PROC(REMOVE, remove, remove, 0),
2533 PROC(RMDIR, lookup, setattr, 0),
2534 PROC(RENAME, rename, rename, 0),
2535 PROC(LINK, link, link, 0),
2536 PROC(READDIR, readdir, readdir, 3),
2537 PROC(READDIRPLUS, readdirplus, readdir, 3),
2538 PROC(FSSTAT, getattr, fsstat, 0),
2539 PROC(FSINFO, getattr, fsinfo, 0),
2540 PROC(PATHCONF, getattr, pathconf, 0),
2541 PROC(COMMIT, commit, commit, 5),
2542};
2543
2544static unsigned int nfs_version3_counts[ARRAY_SIZE(nfs3_procedures)];
2545const struct rpc_version nfs_version3 = {
2546 .number = 3,
2547 .nrprocs = ARRAY_SIZE(nfs3_procedures),
2548 .procs = nfs3_procedures,
2549 .counts = nfs_version3_counts,
2550};
2551
2552#ifdef CONFIG_NFS_V3_ACL
2553static const struct rpc_procinfo nfs3_acl_procedures[] = {
2554 [ACLPROC3_GETACL] = {
2555 .p_proc = ACLPROC3_GETACL,
2556 .p_encode = nfs3_xdr_enc_getacl3args,
2557 .p_decode = nfs3_xdr_dec_getacl3res,
2558 .p_arglen = ACL3_getaclargs_sz,
2559 .p_replen = ACL3_getaclres_sz,
2560 .p_timer = 1,
2561 .p_name = "GETACL",
2562 },
2563 [ACLPROC3_SETACL] = {
2564 .p_proc = ACLPROC3_SETACL,
2565 .p_encode = nfs3_xdr_enc_setacl3args,
2566 .p_decode = nfs3_xdr_dec_setacl3res,
2567 .p_arglen = ACL3_setaclargs_sz,
2568 .p_replen = ACL3_setaclres_sz,
2569 .p_timer = 0,
2570 .p_name = "SETACL",
2571 },
2572};
2573
2574static unsigned int nfs3_acl_counts[ARRAY_SIZE(nfs3_acl_procedures)];
2575const struct rpc_version nfsacl_version3 = {
2576 .number = 3,
2577 .nrprocs = ARRAY_SIZE(nfs3_acl_procedures),
2578 .procs = nfs3_acl_procedures,
2579 .counts = nfs3_acl_counts,
2580};
2581#endif /* CONFIG_NFS_V3_ACL */
2582

source code of linux/fs/nfs/nfs3xdr.c