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TOMOYO Linux Cross Reference
Linux/fs/nfs/nfs3xdr.c

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  1 /*
  2  * linux/fs/nfs/nfs3xdr.c
  3  *
  4  * XDR functions to encode/decode NFSv3 RPC arguments and results.
  5  *
  6  * Copyright (C) 1996, 1997 Olaf Kirch
  7  */
  8 
  9 #include <linux/param.h>
 10 #include <linux/time.h>
 11 #include <linux/mm.h>
 12 #include <linux/errno.h>
 13 #include <linux/string.h>
 14 #include <linux/in.h>
 15 #include <linux/pagemap.h>
 16 #include <linux/proc_fs.h>
 17 #include <linux/kdev_t.h>
 18 #include <linux/sunrpc/clnt.h>
 19 #include <linux/nfs.h>
 20 #include <linux/nfs3.h>
 21 #include <linux/nfs_fs.h>
 22 #include <linux/nfsacl.h>
 23 #include "internal.h"
 24 
 25 #define NFSDBG_FACILITY         NFSDBG_XDR
 26 
 27 /* Mapping from NFS error code to "errno" error code. */
 28 #define errno_NFSERR_IO         EIO
 29 
 30 /*
 31  * Declare the space requirements for NFS arguments and replies as
 32  * number of 32bit-words
 33  */
 34 #define NFS3_fhandle_sz         (1+16)
 35 #define NFS3_fh_sz              (NFS3_fhandle_sz)       /* shorthand */
 36 #define NFS3_sattr_sz           (15)
 37 #define NFS3_filename_sz        (1+(NFS3_MAXNAMLEN>>2))
 38 #define NFS3_path_sz            (1+(NFS3_MAXPATHLEN>>2))
 39 #define NFS3_fattr_sz           (21)
 40 #define NFS3_cookieverf_sz      (NFS3_COOKIEVERFSIZE>>2)
 41 #define NFS3_wcc_attr_sz        (6)
 42 #define NFS3_pre_op_attr_sz     (1+NFS3_wcc_attr_sz)
 43 #define NFS3_post_op_attr_sz    (1+NFS3_fattr_sz)
 44 #define NFS3_wcc_data_sz        (NFS3_pre_op_attr_sz+NFS3_post_op_attr_sz)
 45 #define NFS3_diropargs_sz       (NFS3_fh_sz+NFS3_filename_sz)
 46 
 47 #define NFS3_getattrargs_sz     (NFS3_fh_sz)
 48 #define NFS3_setattrargs_sz     (NFS3_fh_sz+NFS3_sattr_sz+3)
 49 #define NFS3_lookupargs_sz      (NFS3_fh_sz+NFS3_filename_sz)
 50 #define NFS3_accessargs_sz      (NFS3_fh_sz+1)
 51 #define NFS3_readlinkargs_sz    (NFS3_fh_sz)
 52 #define NFS3_readargs_sz        (NFS3_fh_sz+3)
 53 #define NFS3_writeargs_sz       (NFS3_fh_sz+5)
 54 #define NFS3_createargs_sz      (NFS3_diropargs_sz+NFS3_sattr_sz)
 55 #define NFS3_mkdirargs_sz       (NFS3_diropargs_sz+NFS3_sattr_sz)
 56 #define NFS3_symlinkargs_sz     (NFS3_diropargs_sz+1+NFS3_sattr_sz)
 57 #define NFS3_mknodargs_sz       (NFS3_diropargs_sz+2+NFS3_sattr_sz)
 58 #define NFS3_removeargs_sz      (NFS3_fh_sz+NFS3_filename_sz)
 59 #define NFS3_renameargs_sz      (NFS3_diropargs_sz+NFS3_diropargs_sz)
 60 #define NFS3_linkargs_sz                (NFS3_fh_sz+NFS3_diropargs_sz)
 61 #define NFS3_readdirargs_sz     (NFS3_fh_sz+NFS3_cookieverf_sz+3)
 62 #define NFS3_readdirplusargs_sz (NFS3_fh_sz+NFS3_cookieverf_sz+4)
 63 #define NFS3_commitargs_sz      (NFS3_fh_sz+3)
 64 
 65 #define NFS3_getattrres_sz      (1+NFS3_fattr_sz)
 66 #define NFS3_setattrres_sz      (1+NFS3_wcc_data_sz)
 67 #define NFS3_removeres_sz       (NFS3_setattrres_sz)
 68 #define NFS3_lookupres_sz       (1+NFS3_fh_sz+(2 * NFS3_post_op_attr_sz))
 69 #define NFS3_accessres_sz       (1+NFS3_post_op_attr_sz+1)
 70 #define NFS3_readlinkres_sz     (1+NFS3_post_op_attr_sz+1)
 71 #define NFS3_readres_sz         (1+NFS3_post_op_attr_sz+3)
 72 #define NFS3_writeres_sz        (1+NFS3_wcc_data_sz+4)
 73 #define NFS3_createres_sz       (1+NFS3_fh_sz+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
 74 #define NFS3_renameres_sz       (1+(2 * NFS3_wcc_data_sz))
 75 #define NFS3_linkres_sz         (1+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
 76 #define NFS3_readdirres_sz      (1+NFS3_post_op_attr_sz+2)
 77 #define NFS3_fsstatres_sz       (1+NFS3_post_op_attr_sz+13)
 78 #define NFS3_fsinfores_sz       (1+NFS3_post_op_attr_sz+12)
 79 #define NFS3_pathconfres_sz     (1+NFS3_post_op_attr_sz+6)
 80 #define NFS3_commitres_sz       (1+NFS3_wcc_data_sz+2)
 81 
 82 #define ACL3_getaclargs_sz      (NFS3_fh_sz+1)
 83 #define ACL3_setaclargs_sz      (NFS3_fh_sz+1+ \
 84                                 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
 85 #define ACL3_getaclres_sz       (1+NFS3_post_op_attr_sz+1+ \
 86                                 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
 87 #define ACL3_setaclres_sz       (1+NFS3_post_op_attr_sz)
 88 
 89 static int nfs3_stat_to_errno(enum nfs_stat);
 90 
 91 /*
 92  * Map file type to S_IFMT bits
 93  */
 94 static const umode_t nfs_type2fmt[] = {
 95         [NF3BAD] = 0,
 96         [NF3REG] = S_IFREG,
 97         [NF3DIR] = S_IFDIR,
 98         [NF3BLK] = S_IFBLK,
 99         [NF3CHR] = S_IFCHR,
100         [NF3LNK] = S_IFLNK,
101         [NF3SOCK] = S_IFSOCK,
102         [NF3FIFO] = S_IFIFO,
103 };
104 
105 /*
106  * While encoding arguments, set up the reply buffer in advance to
107  * receive reply data directly into the page cache.
108  */
109 static void prepare_reply_buffer(struct rpc_rqst *req, struct page **pages,
110                                  unsigned int base, unsigned int len,
111                                  unsigned int bufsize)
112 {
113         struct rpc_auth *auth = req->rq_cred->cr_auth;
114         unsigned int replen;
115 
116         replen = RPC_REPHDRSIZE + auth->au_rslack + bufsize;
117         xdr_inline_pages(&req->rq_rcv_buf, replen << 2, pages, base, len);
118 }
119 
120 /*
121  * Handle decode buffer overflows out-of-line.
122  */
123 static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
124 {
125         dprintk("NFS: %s prematurely hit the end of our receive buffer. "
126                 "Remaining buffer length is %tu words.\n",
127                 func, xdr->end - xdr->p);
128 }
129 
130 
131 /*
132  * Encode/decode NFSv3 basic data types
133  *
134  * Basic NFSv3 data types are defined in section 2.5 of RFC 1813:
135  * "NFS Version 3 Protocol Specification".
136  *
137  * Not all basic data types have their own encoding and decoding
138  * functions.  For run-time efficiency, some data types are encoded
139  * or decoded inline.
140  */
141 
142 static void encode_uint32(struct xdr_stream *xdr, u32 value)
143 {
144         __be32 *p = xdr_reserve_space(xdr, 4);
145         *p = cpu_to_be32(value);
146 }
147 
148 static int decode_uint32(struct xdr_stream *xdr, u32 *value)
149 {
150         __be32 *p;
151 
152         p = xdr_inline_decode(xdr, 4);
153         if (unlikely(p == NULL))
154                 goto out_overflow;
155         *value = be32_to_cpup(p);
156         return 0;
157 out_overflow:
158         print_overflow_msg(__func__, xdr);
159         return -EIO;
160 }
161 
162 static int decode_uint64(struct xdr_stream *xdr, u64 *value)
163 {
164         __be32 *p;
165 
166         p = xdr_inline_decode(xdr, 8);
167         if (unlikely(p == NULL))
168                 goto out_overflow;
169         xdr_decode_hyper(p, value);
170         return 0;
171 out_overflow:
172         print_overflow_msg(__func__, xdr);
173         return -EIO;
174 }
175 
176 /*
177  * fileid3
178  *
179  *      typedef uint64 fileid3;
180  */
181 static __be32 *xdr_decode_fileid3(__be32 *p, u64 *fileid)
182 {
183         return xdr_decode_hyper(p, fileid);
184 }
185 
186 static int decode_fileid3(struct xdr_stream *xdr, u64 *fileid)
187 {
188         return decode_uint64(xdr, fileid);
189 }
190 
191 /*
192  * filename3
193  *
194  *      typedef string filename3<>;
195  */
196 static void encode_filename3(struct xdr_stream *xdr,
197                              const char *name, u32 length)
198 {
199         __be32 *p;
200 
201         BUG_ON(length > NFS3_MAXNAMLEN);
202         p = xdr_reserve_space(xdr, 4 + length);
203         xdr_encode_opaque(p, name, length);
204 }
205 
206 static int decode_inline_filename3(struct xdr_stream *xdr,
207                                    const char **name, u32 *length)
208 {
209         __be32 *p;
210         u32 count;
211 
212         p = xdr_inline_decode(xdr, 4);
213         if (unlikely(p == NULL))
214                 goto out_overflow;
215         count = be32_to_cpup(p);
216         if (count > NFS3_MAXNAMLEN)
217                 goto out_nametoolong;
218         p = xdr_inline_decode(xdr, count);
219         if (unlikely(p == NULL))
220                 goto out_overflow;
221         *name = (const char *)p;
222         *length = count;
223         return 0;
224 
225 out_nametoolong:
226         dprintk("NFS: returned filename too long: %u\n", count);
227         return -ENAMETOOLONG;
228 out_overflow:
229         print_overflow_msg(__func__, xdr);
230         return -EIO;
231 }
232 
233 /*
234  * nfspath3
235  *
236  *      typedef string nfspath3<>;
237  */
238 static void encode_nfspath3(struct xdr_stream *xdr, struct page **pages,
239                             const u32 length)
240 {
241         BUG_ON(length > NFS3_MAXPATHLEN);
242         encode_uint32(xdr, length);
243         xdr_write_pages(xdr, pages, 0, length);
244 }
245 
246 static int decode_nfspath3(struct xdr_stream *xdr)
247 {
248         u32 recvd, count;
249         __be32 *p;
250 
251         p = xdr_inline_decode(xdr, 4);
252         if (unlikely(p == NULL))
253                 goto out_overflow;
254         count = be32_to_cpup(p);
255         if (unlikely(count >= xdr->buf->page_len || count > NFS3_MAXPATHLEN))
256                 goto out_nametoolong;
257         recvd = xdr_read_pages(xdr, count);
258         if (unlikely(count > recvd))
259                 goto out_cheating;
260         xdr_terminate_string(xdr->buf, count);
261         return 0;
262 
263 out_nametoolong:
264         dprintk("NFS: returned pathname too long: %u\n", count);
265         return -ENAMETOOLONG;
266 out_cheating:
267         dprintk("NFS: server cheating in pathname result: "
268                 "count %u > recvd %u\n", count, recvd);
269         return -EIO;
270 out_overflow:
271         print_overflow_msg(__func__, xdr);
272         return -EIO;
273 }
274 
275 /*
276  * cookie3
277  *
278  *      typedef uint64 cookie3
279  */
280 static __be32 *xdr_encode_cookie3(__be32 *p, u64 cookie)
281 {
282         return xdr_encode_hyper(p, cookie);
283 }
284 
285 static int decode_cookie3(struct xdr_stream *xdr, u64 *cookie)
286 {
287         return decode_uint64(xdr, cookie);
288 }
289 
290 /*
291  * cookieverf3
292  *
293  *      typedef opaque cookieverf3[NFS3_COOKIEVERFSIZE];
294  */
295 static __be32 *xdr_encode_cookieverf3(__be32 *p, const __be32 *verifier)
296 {
297         memcpy(p, verifier, NFS3_COOKIEVERFSIZE);
298         return p + XDR_QUADLEN(NFS3_COOKIEVERFSIZE);
299 }
300 
301 static int decode_cookieverf3(struct xdr_stream *xdr, __be32 *verifier)
302 {
303         __be32 *p;
304 
305         p = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE);
306         if (unlikely(p == NULL))
307                 goto out_overflow;
308         memcpy(verifier, p, NFS3_COOKIEVERFSIZE);
309         return 0;
310 out_overflow:
311         print_overflow_msg(__func__, xdr);
312         return -EIO;
313 }
314 
315 /*
316  * createverf3
317  *
318  *      typedef opaque createverf3[NFS3_CREATEVERFSIZE];
319  */
320 static void encode_createverf3(struct xdr_stream *xdr, const __be32 *verifier)
321 {
322         __be32 *p;
323 
324         p = xdr_reserve_space(xdr, NFS3_CREATEVERFSIZE);
325         memcpy(p, verifier, NFS3_CREATEVERFSIZE);
326 }
327 
328 static int decode_writeverf3(struct xdr_stream *xdr, struct nfs_write_verifier *verifier)
329 {
330         __be32 *p;
331 
332         p = xdr_inline_decode(xdr, NFS3_WRITEVERFSIZE);
333         if (unlikely(p == NULL))
334                 goto out_overflow;
335         memcpy(verifier->data, p, NFS3_WRITEVERFSIZE);
336         return 0;
337 out_overflow:
338         print_overflow_msg(__func__, xdr);
339         return -EIO;
340 }
341 
342 /*
343  * size3
344  *
345  *      typedef uint64 size3;
346  */
347 static __be32 *xdr_decode_size3(__be32 *p, u64 *size)
348 {
349         return xdr_decode_hyper(p, size);
350 }
351 
352 /*
353  * nfsstat3
354  *
355  *      enum nfsstat3 {
356  *              NFS3_OK = 0,
357  *              ...
358  *      }
359  */
360 #define NFS3_OK         NFS_OK
361 
362 static int decode_nfsstat3(struct xdr_stream *xdr, enum nfs_stat *status)
363 {
364         __be32 *p;
365 
366         p = xdr_inline_decode(xdr, 4);
367         if (unlikely(p == NULL))
368                 goto out_overflow;
369         *status = be32_to_cpup(p);
370         return 0;
371 out_overflow:
372         print_overflow_msg(__func__, xdr);
373         return -EIO;
374 }
375 
376 /*
377  * ftype3
378  *
379  *      enum ftype3 {
380  *              NF3REG  = 1,
381  *              NF3DIR  = 2,
382  *              NF3BLK  = 3,
383  *              NF3CHR  = 4,
384  *              NF3LNK  = 5,
385  *              NF3SOCK = 6,
386  *              NF3FIFO = 7
387  *      };
388  */
389 static void encode_ftype3(struct xdr_stream *xdr, const u32 type)
390 {
391         BUG_ON(type > NF3FIFO);
392         encode_uint32(xdr, type);
393 }
394 
395 static __be32 *xdr_decode_ftype3(__be32 *p, umode_t *mode)
396 {
397         u32 type;
398 
399         type = be32_to_cpup(p++);
400         if (type > NF3FIFO)
401                 type = NF3NON;
402         *mode = nfs_type2fmt[type];
403         return p;
404 }
405 
406 /*
407  * specdata3
408  *
409  *     struct specdata3 {
410  *             uint32  specdata1;
411  *             uint32  specdata2;
412  *     };
413  */
414 static void encode_specdata3(struct xdr_stream *xdr, const dev_t rdev)
415 {
416         __be32 *p;
417 
418         p = xdr_reserve_space(xdr, 8);
419         *p++ = cpu_to_be32(MAJOR(rdev));
420         *p = cpu_to_be32(MINOR(rdev));
421 }
422 
423 static __be32 *xdr_decode_specdata3(__be32 *p, dev_t *rdev)
424 {
425         unsigned int major, minor;
426 
427         major = be32_to_cpup(p++);
428         minor = be32_to_cpup(p++);
429         *rdev = MKDEV(major, minor);
430         if (MAJOR(*rdev) != major || MINOR(*rdev) != minor)
431                 *rdev = 0;
432         return p;
433 }
434 
435 /*
436  * nfs_fh3
437  *
438  *      struct nfs_fh3 {
439  *              opaque       data<NFS3_FHSIZE>;
440  *      };
441  */
442 static void encode_nfs_fh3(struct xdr_stream *xdr, const struct nfs_fh *fh)
443 {
444         __be32 *p;
445 
446         BUG_ON(fh->size > NFS3_FHSIZE);
447         p = xdr_reserve_space(xdr, 4 + fh->size);
448         xdr_encode_opaque(p, fh->data, fh->size);
449 }
450 
451 static int decode_nfs_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
452 {
453         u32 length;
454         __be32 *p;
455 
456         p = xdr_inline_decode(xdr, 4);
457         if (unlikely(p == NULL))
458                 goto out_overflow;
459         length = be32_to_cpup(p++);
460         if (unlikely(length > NFS3_FHSIZE))
461                 goto out_toobig;
462         p = xdr_inline_decode(xdr, length);
463         if (unlikely(p == NULL))
464                 goto out_overflow;
465         fh->size = length;
466         memcpy(fh->data, p, length);
467         return 0;
468 out_toobig:
469         dprintk("NFS: file handle size (%u) too big\n", length);
470         return -E2BIG;
471 out_overflow:
472         print_overflow_msg(__func__, xdr);
473         return -EIO;
474 }
475 
476 static void zero_nfs_fh3(struct nfs_fh *fh)
477 {
478         memset(fh, 0, sizeof(*fh));
479 }
480 
481 /*
482  * nfstime3
483  *
484  *      struct nfstime3 {
485  *              uint32  seconds;
486  *              uint32  nseconds;
487  *      };
488  */
489 static __be32 *xdr_encode_nfstime3(__be32 *p, const struct timespec *timep)
490 {
491         *p++ = cpu_to_be32(timep->tv_sec);
492         *p++ = cpu_to_be32(timep->tv_nsec);
493         return p;
494 }
495 
496 static __be32 *xdr_decode_nfstime3(__be32 *p, struct timespec *timep)
497 {
498         timep->tv_sec = be32_to_cpup(p++);
499         timep->tv_nsec = be32_to_cpup(p++);
500         return p;
501 }
502 
503 /*
504  * sattr3
505  *
506  *      enum time_how {
507  *              DONT_CHANGE             = 0,
508  *              SET_TO_SERVER_TIME      = 1,
509  *              SET_TO_CLIENT_TIME      = 2
510  *      };
511  *
512  *      union set_mode3 switch (bool set_it) {
513  *      case TRUE:
514  *              mode3   mode;
515  *      default:
516  *              void;
517  *      };
518  *
519  *      union set_uid3 switch (bool set_it) {
520  *      case TRUE:
521  *              uid3    uid;
522  *      default:
523  *              void;
524  *      };
525  *
526  *      union set_gid3 switch (bool set_it) {
527  *      case TRUE:
528  *              gid3    gid;
529  *      default:
530  *              void;
531  *      };
532  *
533  *      union set_size3 switch (bool set_it) {
534  *      case TRUE:
535  *              size3   size;
536  *      default:
537  *              void;
538  *      };
539  *
540  *      union set_atime switch (time_how set_it) {
541  *      case SET_TO_CLIENT_TIME:
542  *              nfstime3        atime;
543  *      default:
544  *              void;
545  *      };
546  *
547  *      union set_mtime switch (time_how set_it) {
548  *      case SET_TO_CLIENT_TIME:
549  *              nfstime3  mtime;
550  *      default:
551  *              void;
552  *      };
553  *
554  *      struct sattr3 {
555  *              set_mode3       mode;
556  *              set_uid3        uid;
557  *              set_gid3        gid;
558  *              set_size3       size;
559  *              set_atime       atime;
560  *              set_mtime       mtime;
561  *      };
562  */
563 static void encode_sattr3(struct xdr_stream *xdr, const struct iattr *attr)
564 {
565         u32 nbytes;
566         __be32 *p;
567 
568         /*
569          * In order to make only a single xdr_reserve_space() call,
570          * pre-compute the total number of bytes to be reserved.
571          * Six boolean values, one for each set_foo field, are always
572          * present in the encoded result, so start there.
573          */
574         nbytes = 6 * 4;
575         if (attr->ia_valid & ATTR_MODE)
576                 nbytes += 4;
577         if (attr->ia_valid & ATTR_UID)
578                 nbytes += 4;
579         if (attr->ia_valid & ATTR_GID)
580                 nbytes += 4;
581         if (attr->ia_valid & ATTR_SIZE)
582                 nbytes += 8;
583         if (attr->ia_valid & ATTR_ATIME_SET)
584                 nbytes += 8;
585         if (attr->ia_valid & ATTR_MTIME_SET)
586                 nbytes += 8;
587         p = xdr_reserve_space(xdr, nbytes);
588 
589         if (attr->ia_valid & ATTR_MODE) {
590                 *p++ = xdr_one;
591                 *p++ = cpu_to_be32(attr->ia_mode & S_IALLUGO);
592         } else
593                 *p++ = xdr_zero;
594 
595         if (attr->ia_valid & ATTR_UID) {
596                 *p++ = xdr_one;
597                 *p++ = cpu_to_be32(attr->ia_uid);
598         } else
599                 *p++ = xdr_zero;
600 
601         if (attr->ia_valid & ATTR_GID) {
602                 *p++ = xdr_one;
603                 *p++ = cpu_to_be32(attr->ia_gid);
604         } else
605                 *p++ = xdr_zero;
606 
607         if (attr->ia_valid & ATTR_SIZE) {
608                 *p++ = xdr_one;
609                 p = xdr_encode_hyper(p, (u64)attr->ia_size);
610         } else
611                 *p++ = xdr_zero;
612 
613         if (attr->ia_valid & ATTR_ATIME_SET) {
614                 *p++ = xdr_two;
615                 p = xdr_encode_nfstime3(p, &attr->ia_atime);
616         } else if (attr->ia_valid & ATTR_ATIME) {
617                 *p++ = xdr_one;
618         } else
619                 *p++ = xdr_zero;
620 
621         if (attr->ia_valid & ATTR_MTIME_SET) {
622                 *p++ = xdr_two;
623                 xdr_encode_nfstime3(p, &attr->ia_mtime);
624         } else if (attr->ia_valid & ATTR_MTIME) {
625                 *p = xdr_one;
626         } else
627                 *p = xdr_zero;
628 }
629 
630 /*
631  * fattr3
632  *
633  *      struct fattr3 {
634  *              ftype3          type;
635  *              mode3           mode;
636  *              uint32          nlink;
637  *              uid3            uid;
638  *              gid3            gid;
639  *              size3           size;
640  *              size3           used;
641  *              specdata3       rdev;
642  *              uint64          fsid;
643  *              fileid3         fileid;
644  *              nfstime3        atime;
645  *              nfstime3        mtime;
646  *              nfstime3        ctime;
647  *      };
648  */
649 static int decode_fattr3(struct xdr_stream *xdr, struct nfs_fattr *fattr)
650 {
651         umode_t fmode;
652         __be32 *p;
653 
654         p = xdr_inline_decode(xdr, NFS3_fattr_sz << 2);
655         if (unlikely(p == NULL))
656                 goto out_overflow;
657 
658         p = xdr_decode_ftype3(p, &fmode);
659 
660         fattr->mode = (be32_to_cpup(p++) & ~S_IFMT) | fmode;
661         fattr->nlink = be32_to_cpup(p++);
662         fattr->uid = be32_to_cpup(p++);
663         fattr->gid = be32_to_cpup(p++);
664 
665         p = xdr_decode_size3(p, &fattr->size);
666         p = xdr_decode_size3(p, &fattr->du.nfs3.used);
667         p = xdr_decode_specdata3(p, &fattr->rdev);
668 
669         p = xdr_decode_hyper(p, &fattr->fsid.major);
670         fattr->fsid.minor = 0;
671 
672         p = xdr_decode_fileid3(p, &fattr->fileid);
673         p = xdr_decode_nfstime3(p, &fattr->atime);
674         p = xdr_decode_nfstime3(p, &fattr->mtime);
675         xdr_decode_nfstime3(p, &fattr->ctime);
676         fattr->change_attr = nfs_timespec_to_change_attr(&fattr->ctime);
677 
678         fattr->valid |= NFS_ATTR_FATTR_V3;
679         return 0;
680 out_overflow:
681         print_overflow_msg(__func__, xdr);
682         return -EIO;
683 }
684 
685 /*
686  * post_op_attr
687  *
688  *      union post_op_attr switch (bool attributes_follow) {
689  *      case TRUE:
690  *              fattr3  attributes;
691  *      case FALSE:
692  *              void;
693  *      };
694  */
695 static int decode_post_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
696 {
697         __be32 *p;
698 
699         p = xdr_inline_decode(xdr, 4);
700         if (unlikely(p == NULL))
701                 goto out_overflow;
702         if (*p != xdr_zero)
703                 return decode_fattr3(xdr, fattr);
704         return 0;
705 out_overflow:
706         print_overflow_msg(__func__, xdr);
707         return -EIO;
708 }
709 
710 /*
711  * wcc_attr
712  *      struct wcc_attr {
713  *              size3           size;
714  *              nfstime3        mtime;
715  *              nfstime3        ctime;
716  *      };
717  */
718 static int decode_wcc_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
719 {
720         __be32 *p;
721 
722         p = xdr_inline_decode(xdr, NFS3_wcc_attr_sz << 2);
723         if (unlikely(p == NULL))
724                 goto out_overflow;
725 
726         fattr->valid |= NFS_ATTR_FATTR_PRESIZE
727                 | NFS_ATTR_FATTR_PRECHANGE
728                 | NFS_ATTR_FATTR_PREMTIME
729                 | NFS_ATTR_FATTR_PRECTIME;
730 
731         p = xdr_decode_size3(p, &fattr->pre_size);
732         p = xdr_decode_nfstime3(p, &fattr->pre_mtime);
733         xdr_decode_nfstime3(p, &fattr->pre_ctime);
734         fattr->pre_change_attr = nfs_timespec_to_change_attr(&fattr->pre_ctime);
735 
736         return 0;
737 out_overflow:
738         print_overflow_msg(__func__, xdr);
739         return -EIO;
740 }
741 
742 /*
743  * pre_op_attr
744  *      union pre_op_attr switch (bool attributes_follow) {
745  *      case TRUE:
746  *              wcc_attr        attributes;
747  *      case FALSE:
748  *              void;
749  *      };
750  *
751  * wcc_data
752  *
753  *      struct wcc_data {
754  *              pre_op_attr     before;
755  *              post_op_attr    after;
756  *      };
757  */
758 static int decode_pre_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
759 {
760         __be32 *p;
761 
762         p = xdr_inline_decode(xdr, 4);
763         if (unlikely(p == NULL))
764                 goto out_overflow;
765         if (*p != xdr_zero)
766                 return decode_wcc_attr(xdr, fattr);
767         return 0;
768 out_overflow:
769         print_overflow_msg(__func__, xdr);
770         return -EIO;
771 }
772 
773 static int decode_wcc_data(struct xdr_stream *xdr, struct nfs_fattr *fattr)
774 {
775         int error;
776 
777         error = decode_pre_op_attr(xdr, fattr);
778         if (unlikely(error))
779                 goto out;
780         error = decode_post_op_attr(xdr, fattr);
781 out:
782         return error;
783 }
784 
785 /*
786  * post_op_fh3
787  *
788  *      union post_op_fh3 switch (bool handle_follows) {
789  *      case TRUE:
790  *              nfs_fh3  handle;
791  *      case FALSE:
792  *              void;
793  *      };
794  */
795 static int decode_post_op_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
796 {
797         __be32 *p = xdr_inline_decode(xdr, 4);
798         if (unlikely(p == NULL))
799                 goto out_overflow;
800         if (*p != xdr_zero)
801                 return decode_nfs_fh3(xdr, fh);
802         zero_nfs_fh3(fh);
803         return 0;
804 out_overflow:
805         print_overflow_msg(__func__, xdr);
806         return -EIO;
807 }
808 
809 /*
810  * diropargs3
811  *
812  *      struct diropargs3 {
813  *              nfs_fh3         dir;
814  *              filename3       name;
815  *      };
816  */
817 static void encode_diropargs3(struct xdr_stream *xdr, const struct nfs_fh *fh,
818                               const char *name, u32 length)
819 {
820         encode_nfs_fh3(xdr, fh);
821         encode_filename3(xdr, name, length);
822 }
823 
824 
825 /*
826  * NFSv3 XDR encode functions
827  *
828  * NFSv3 argument types are defined in section 3.3 of RFC 1813:
829  * "NFS Version 3 Protocol Specification".
830  */
831 
832 /*
833  * 3.3.1  GETATTR3args
834  *
835  *      struct GETATTR3args {
836  *              nfs_fh3  object;
837  *      };
838  */
839 static void nfs3_xdr_enc_getattr3args(struct rpc_rqst *req,
840                                       struct xdr_stream *xdr,
841                                       const struct nfs_fh *fh)
842 {
843         encode_nfs_fh3(xdr, fh);
844 }
845 
846 /*
847  * 3.3.2  SETATTR3args
848  *
849  *      union sattrguard3 switch (bool check) {
850  *      case TRUE:
851  *              nfstime3  obj_ctime;
852  *      case FALSE:
853  *              void;
854  *      };
855  *
856  *      struct SETATTR3args {
857  *              nfs_fh3         object;
858  *              sattr3          new_attributes;
859  *              sattrguard3     guard;
860  *      };
861  */
862 static void encode_sattrguard3(struct xdr_stream *xdr,
863                                const struct nfs3_sattrargs *args)
864 {
865         __be32 *p;
866 
867         if (args->guard) {
868                 p = xdr_reserve_space(xdr, 4 + 8);
869                 *p++ = xdr_one;
870                 xdr_encode_nfstime3(p, &args->guardtime);
871         } else {
872                 p = xdr_reserve_space(xdr, 4);
873                 *p = xdr_zero;
874         }
875 }
876 
877 static void nfs3_xdr_enc_setattr3args(struct rpc_rqst *req,
878                                       struct xdr_stream *xdr,
879                                       const struct nfs3_sattrargs *args)
880 {
881         encode_nfs_fh3(xdr, args->fh);
882         encode_sattr3(xdr, args->sattr);
883         encode_sattrguard3(xdr, args);
884 }
885 
886 /*
887  * 3.3.3  LOOKUP3args
888  *
889  *      struct LOOKUP3args {
890  *              diropargs3  what;
891  *      };
892  */
893 static void nfs3_xdr_enc_lookup3args(struct rpc_rqst *req,
894                                      struct xdr_stream *xdr,
895                                      const struct nfs3_diropargs *args)
896 {
897         encode_diropargs3(xdr, args->fh, args->name, args->len);
898 }
899 
900 /*
901  * 3.3.4  ACCESS3args
902  *
903  *      struct ACCESS3args {
904  *              nfs_fh3         object;
905  *              uint32          access;
906  *      };
907  */
908 static void encode_access3args(struct xdr_stream *xdr,
909                                const struct nfs3_accessargs *args)
910 {
911         encode_nfs_fh3(xdr, args->fh);
912         encode_uint32(xdr, args->access);
913 }
914 
915 static void nfs3_xdr_enc_access3args(struct rpc_rqst *req,
916                                      struct xdr_stream *xdr,
917                                      const struct nfs3_accessargs *args)
918 {
919         encode_access3args(xdr, args);
920 }
921 
922 /*
923  * 3.3.5  READLINK3args
924  *
925  *      struct READLINK3args {
926  *              nfs_fh3 symlink;
927  *      };
928  */
929 static void nfs3_xdr_enc_readlink3args(struct rpc_rqst *req,
930                                        struct xdr_stream *xdr,
931                                        const struct nfs3_readlinkargs *args)
932 {
933         encode_nfs_fh3(xdr, args->fh);
934         prepare_reply_buffer(req, args->pages, args->pgbase,
935                                         args->pglen, NFS3_readlinkres_sz);
936 }
937 
938 /*
939  * 3.3.6  READ3args
940  *
941  *      struct READ3args {
942  *              nfs_fh3         file;
943  *              offset3         offset;
944  *              count3          count;
945  *      };
946  */
947 static void encode_read3args(struct xdr_stream *xdr,
948                              const struct nfs_readargs *args)
949 {
950         __be32 *p;
951 
952         encode_nfs_fh3(xdr, args->fh);
953 
954         p = xdr_reserve_space(xdr, 8 + 4);
955         p = xdr_encode_hyper(p, args->offset);
956         *p = cpu_to_be32(args->count);
957 }
958 
959 static void nfs3_xdr_enc_read3args(struct rpc_rqst *req,
960                                    struct xdr_stream *xdr,
961                                    const struct nfs_readargs *args)
962 {
963         encode_read3args(xdr, args);
964         prepare_reply_buffer(req, args->pages, args->pgbase,
965                                         args->count, NFS3_readres_sz);
966         req->rq_rcv_buf.flags |= XDRBUF_READ;
967 }
968 
969 /*
970  * 3.3.7  WRITE3args
971  *
972  *      enum stable_how {
973  *              UNSTABLE  = 0,
974  *              DATA_SYNC = 1,
975  *              FILE_SYNC = 2
976  *      };
977  *
978  *      struct WRITE3args {
979  *              nfs_fh3         file;
980  *              offset3         offset;
981  *              count3          count;
982  *              stable_how      stable;
983  *              opaque          data<>;
984  *      };
985  */
986 static void encode_write3args(struct xdr_stream *xdr,
987                               const struct nfs_writeargs *args)
988 {
989         __be32 *p;
990 
991         encode_nfs_fh3(xdr, args->fh);
992 
993         p = xdr_reserve_space(xdr, 8 + 4 + 4 + 4);
994         p = xdr_encode_hyper(p, args->offset);
995         *p++ = cpu_to_be32(args->count);
996         *p++ = cpu_to_be32(args->stable);
997         *p = cpu_to_be32(args->count);
998         xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
999 }
1000 
1001 static void nfs3_xdr_enc_write3args(struct rpc_rqst *req,
1002                                     struct xdr_stream *xdr,
1003                                     const struct nfs_writeargs *args)
1004 {
1005         encode_write3args(xdr, args);
1006         xdr->buf->flags |= XDRBUF_WRITE;
1007 }
1008 
1009 /*
1010  * 3.3.8  CREATE3args
1011  *
1012  *      enum createmode3 {
1013  *              UNCHECKED = 0,
1014  *              GUARDED   = 1,
1015  *              EXCLUSIVE = 2
1016  *      };
1017  *
1018  *      union createhow3 switch (createmode3 mode) {
1019  *      case UNCHECKED:
1020  *      case GUARDED:
1021  *              sattr3       obj_attributes;
1022  *      case EXCLUSIVE:
1023  *              createverf3  verf;
1024  *      };
1025  *
1026  *      struct CREATE3args {
1027  *              diropargs3      where;
1028  *              createhow3      how;
1029  *      };
1030  */
1031 static void encode_createhow3(struct xdr_stream *xdr,
1032                               const struct nfs3_createargs *args)
1033 {
1034         encode_uint32(xdr, args->createmode);
1035         switch (args->createmode) {
1036         case NFS3_CREATE_UNCHECKED:
1037         case NFS3_CREATE_GUARDED:
1038                 encode_sattr3(xdr, args->sattr);
1039                 break;
1040         case NFS3_CREATE_EXCLUSIVE:
1041                 encode_createverf3(xdr, args->verifier);
1042                 break;
1043         default:
1044                 BUG();
1045         }
1046 }
1047 
1048 static void nfs3_xdr_enc_create3args(struct rpc_rqst *req,
1049                                      struct xdr_stream *xdr,
1050                                      const struct nfs3_createargs *args)
1051 {
1052         encode_diropargs3(xdr, args->fh, args->name, args->len);
1053         encode_createhow3(xdr, args);
1054 }
1055 
1056 /*
1057  * 3.3.9  MKDIR3args
1058  *
1059  *      struct MKDIR3args {
1060  *              diropargs3      where;
1061  *              sattr3          attributes;
1062  *      };
1063  */
1064 static void nfs3_xdr_enc_mkdir3args(struct rpc_rqst *req,
1065                                     struct xdr_stream *xdr,
1066                                     const struct nfs3_mkdirargs *args)
1067 {
1068         encode_diropargs3(xdr, args->fh, args->name, args->len);
1069         encode_sattr3(xdr, args->sattr);
1070 }
1071 
1072 /*
1073  * 3.3.10  SYMLINK3args
1074  *
1075  *      struct symlinkdata3 {
1076  *              sattr3          symlink_attributes;
1077  *              nfspath3        symlink_data;
1078  *      };
1079  *
1080  *      struct SYMLINK3args {
1081  *              diropargs3      where;
1082  *              symlinkdata3    symlink;
1083  *      };
1084  */
1085 static void encode_symlinkdata3(struct xdr_stream *xdr,
1086                                 const struct nfs3_symlinkargs *args)
1087 {
1088         encode_sattr3(xdr, args->sattr);
1089         encode_nfspath3(xdr, args->pages, args->pathlen);
1090 }
1091 
1092 static void nfs3_xdr_enc_symlink3args(struct rpc_rqst *req,
1093                                       struct xdr_stream *xdr,
1094                                       const struct nfs3_symlinkargs *args)
1095 {
1096         encode_diropargs3(xdr, args->fromfh, args->fromname, args->fromlen);
1097         encode_symlinkdata3(xdr, args);
1098 }
1099 
1100 /*
1101  * 3.3.11  MKNOD3args
1102  *
1103  *      struct devicedata3 {
1104  *              sattr3          dev_attributes;
1105  *              specdata3       spec;
1106  *      };
1107  *
1108  *      union mknoddata3 switch (ftype3 type) {
1109  *      case NF3CHR:
1110  *      case NF3BLK:
1111  *              devicedata3     device;
1112  *      case NF3SOCK:
1113  *      case NF3FIFO:
1114  *              sattr3          pipe_attributes;
1115  *      default:
1116  *              void;
1117  *      };
1118  *
1119  *      struct MKNOD3args {
1120  *              diropargs3      where;
1121  *              mknoddata3      what;
1122  *      };
1123  */
1124 static void encode_devicedata3(struct xdr_stream *xdr,
1125                                const struct nfs3_mknodargs *args)
1126 {
1127         encode_sattr3(xdr, args->sattr);
1128         encode_specdata3(xdr, args->rdev);
1129 }
1130 
1131 static void encode_mknoddata3(struct xdr_stream *xdr,
1132                               const struct nfs3_mknodargs *args)
1133 {
1134         encode_ftype3(xdr, args->type);
1135         switch (args->type) {
1136         case NF3CHR:
1137         case NF3BLK:
1138                 encode_devicedata3(xdr, args);
1139                 break;
1140         case NF3SOCK:
1141         case NF3FIFO:
1142                 encode_sattr3(xdr, args->sattr);
1143                 break;
1144         case NF3REG:
1145         case NF3DIR:
1146                 break;
1147         default:
1148                 BUG();
1149         }
1150 }
1151 
1152 static void nfs3_xdr_enc_mknod3args(struct rpc_rqst *req,
1153                                     struct xdr_stream *xdr,
1154                                     const struct nfs3_mknodargs *args)
1155 {
1156         encode_diropargs3(xdr, args->fh, args->name, args->len);
1157         encode_mknoddata3(xdr, args);
1158 }
1159 
1160 /*
1161  * 3.3.12  REMOVE3args
1162  *
1163  *      struct REMOVE3args {
1164  *              diropargs3  object;
1165  *      };
1166  */
1167 static void nfs3_xdr_enc_remove3args(struct rpc_rqst *req,
1168                                      struct xdr_stream *xdr,
1169                                      const struct nfs_removeargs *args)
1170 {
1171         encode_diropargs3(xdr, args->fh, args->name.name, args->name.len);
1172 }
1173 
1174 /*
1175  * 3.3.14  RENAME3args
1176  *
1177  *      struct RENAME3args {
1178  *              diropargs3      from;
1179  *              diropargs3      to;
1180  *      };
1181  */
1182 static void nfs3_xdr_enc_rename3args(struct rpc_rqst *req,
1183                                      struct xdr_stream *xdr,
1184                                      const struct nfs_renameargs *args)
1185 {
1186         const struct qstr *old = args->old_name;
1187         const struct qstr *new = args->new_name;
1188 
1189         encode_diropargs3(xdr, args->old_dir, old->name, old->len);
1190         encode_diropargs3(xdr, args->new_dir, new->name, new->len);
1191 }
1192 
1193 /*
1194  * 3.3.15  LINK3args
1195  *
1196  *      struct LINK3args {
1197  *              nfs_fh3         file;
1198  *              diropargs3      link;
1199  *      };
1200  */
1201 static void nfs3_xdr_enc_link3args(struct rpc_rqst *req,
1202                                    struct xdr_stream *xdr,
1203                                    const struct nfs3_linkargs *args)
1204 {
1205         encode_nfs_fh3(xdr, args->fromfh);
1206         encode_diropargs3(xdr, args->tofh, args->toname, args->tolen);
1207 }
1208 
1209 /*
1210  * 3.3.16  READDIR3args
1211  *
1212  *      struct READDIR3args {
1213  *              nfs_fh3         dir;
1214  *              cookie3         cookie;
1215  *              cookieverf3     cookieverf;
1216  *              count3          count;
1217  *      };
1218  */
1219 static void encode_readdir3args(struct xdr_stream *xdr,
1220                                 const struct nfs3_readdirargs *args)
1221 {
1222         __be32 *p;
1223 
1224         encode_nfs_fh3(xdr, args->fh);
1225 
1226         p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4);
1227         p = xdr_encode_cookie3(p, args->cookie);
1228         p = xdr_encode_cookieverf3(p, args->verf);
1229         *p = cpu_to_be32(args->count);
1230 }
1231 
1232 static void nfs3_xdr_enc_readdir3args(struct rpc_rqst *req,
1233                                       struct xdr_stream *xdr,
1234                                       const struct nfs3_readdirargs *args)
1235 {
1236         encode_readdir3args(xdr, args);
1237         prepare_reply_buffer(req, args->pages, 0,
1238                                 args->count, NFS3_readdirres_sz);
1239 }
1240 
1241 /*
1242  * 3.3.17  READDIRPLUS3args
1243  *
1244  *      struct READDIRPLUS3args {
1245  *              nfs_fh3         dir;
1246  *              cookie3         cookie;
1247  *              cookieverf3     cookieverf;
1248  *              count3          dircount;
1249  *              count3          maxcount;
1250  *      };
1251  */
1252 static void encode_readdirplus3args(struct xdr_stream *xdr,
1253                                     const struct nfs3_readdirargs *args)
1254 {
1255         __be32 *p;
1256 
1257         encode_nfs_fh3(xdr, args->fh);
1258 
1259         p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4 + 4);
1260         p = xdr_encode_cookie3(p, args->cookie);
1261         p = xdr_encode_cookieverf3(p, args->verf);
1262 
1263         /*
1264          * readdirplus: need dircount + buffer size.
1265          * We just make sure we make dircount big enough
1266          */
1267         *p++ = cpu_to_be32(args->count >> 3);
1268 
1269         *p = cpu_to_be32(args->count);
1270 }
1271 
1272 static void nfs3_xdr_enc_readdirplus3args(struct rpc_rqst *req,
1273                                           struct xdr_stream *xdr,
1274                                           const struct nfs3_readdirargs *args)
1275 {
1276         encode_readdirplus3args(xdr, args);
1277         prepare_reply_buffer(req, args->pages, 0,
1278                                 args->count, NFS3_readdirres_sz);
1279 }
1280 
1281 /*
1282  * 3.3.21  COMMIT3args
1283  *
1284  *      struct COMMIT3args {
1285  *              nfs_fh3         file;
1286  *              offset3         offset;
1287  *              count3          count;
1288  *      };
1289  */
1290 static void encode_commit3args(struct xdr_stream *xdr,
1291                                const struct nfs_commitargs *args)
1292 {
1293         __be32 *p;
1294 
1295         encode_nfs_fh3(xdr, args->fh);
1296 
1297         p = xdr_reserve_space(xdr, 8 + 4);
1298         p = xdr_encode_hyper(p, args->offset);
1299         *p = cpu_to_be32(args->count);
1300 }
1301 
1302 static void nfs3_xdr_enc_commit3args(struct rpc_rqst *req,
1303                                      struct xdr_stream *xdr,
1304                                      const struct nfs_commitargs *args)
1305 {
1306         encode_commit3args(xdr, args);
1307 }
1308 
1309 #ifdef CONFIG_NFS_V3_ACL
1310 
1311 static void nfs3_xdr_enc_getacl3args(struct rpc_rqst *req,
1312                                      struct xdr_stream *xdr,
1313                                      const struct nfs3_getaclargs *args)
1314 {
1315         encode_nfs_fh3(xdr, args->fh);
1316         encode_uint32(xdr, args->mask);
1317         if (args->mask & (NFS_ACL | NFS_DFACL))
1318                 prepare_reply_buffer(req, args->pages, 0,
1319                                         NFSACL_MAXPAGES << PAGE_SHIFT,
1320                                         ACL3_getaclres_sz);
1321 }
1322 
1323 static void nfs3_xdr_enc_setacl3args(struct rpc_rqst *req,
1324                                      struct xdr_stream *xdr,
1325                                      const struct nfs3_setaclargs *args)
1326 {
1327         unsigned int base;
1328         int error;
1329 
1330         encode_nfs_fh3(xdr, NFS_FH(args->inode));
1331         encode_uint32(xdr, args->mask);
1332 
1333         base = req->rq_slen;
1334         if (args->npages != 0)
1335                 xdr_write_pages(xdr, args->pages, 0, args->len);
1336         else
1337                 xdr_reserve_space(xdr, NFS_ACL_INLINE_BUFSIZE);
1338 
1339         error = nfsacl_encode(xdr->buf, base, args->inode,
1340                             (args->mask & NFS_ACL) ?
1341                             args->acl_access : NULL, 1, 0);
1342         BUG_ON(error < 0);
1343         error = nfsacl_encode(xdr->buf, base + error, args->inode,
1344                             (args->mask & NFS_DFACL) ?
1345                             args->acl_default : NULL, 1,
1346                             NFS_ACL_DEFAULT);
1347         BUG_ON(error < 0);
1348 }
1349 
1350 #endif  /* CONFIG_NFS_V3_ACL */
1351 
1352 /*
1353  * NFSv3 XDR decode functions
1354  *
1355  * NFSv3 result types are defined in section 3.3 of RFC 1813:
1356  * "NFS Version 3 Protocol Specification".
1357  */
1358 
1359 /*
1360  * 3.3.1  GETATTR3res
1361  *
1362  *      struct GETATTR3resok {
1363  *              fattr3          obj_attributes;
1364  *      };
1365  *
1366  *      union GETATTR3res switch (nfsstat3 status) {
1367  *      case NFS3_OK:
1368  *              GETATTR3resok  resok;
1369  *      default:
1370  *              void;
1371  *      };
1372  */
1373 static int nfs3_xdr_dec_getattr3res(struct rpc_rqst *req,
1374                                     struct xdr_stream *xdr,
1375                                     struct nfs_fattr *result)
1376 {
1377         enum nfs_stat status;
1378         int error;
1379 
1380         error = decode_nfsstat3(xdr, &status);
1381         if (unlikely(error))
1382                 goto out;
1383         if (status != NFS3_OK)
1384                 goto out_default;
1385         error = decode_fattr3(xdr, result);
1386 out:
1387         return error;
1388 out_default:
1389         return nfs3_stat_to_errno(status);
1390 }
1391 
1392 /*
1393  * 3.3.2  SETATTR3res
1394  *
1395  *      struct SETATTR3resok {
1396  *              wcc_data  obj_wcc;
1397  *      };
1398  *
1399  *      struct SETATTR3resfail {
1400  *              wcc_data  obj_wcc;
1401  *      };
1402  *
1403  *      union SETATTR3res switch (nfsstat3 status) {
1404  *      case NFS3_OK:
1405  *              SETATTR3resok   resok;
1406  *      default:
1407  *              SETATTR3resfail resfail;
1408  *      };
1409  */
1410 static int nfs3_xdr_dec_setattr3res(struct rpc_rqst *req,
1411                                     struct xdr_stream *xdr,
1412                                     struct nfs_fattr *result)
1413 {
1414         enum nfs_stat status;
1415         int error;
1416 
1417         error = decode_nfsstat3(xdr, &status);
1418         if (unlikely(error))
1419                 goto out;
1420         error = decode_wcc_data(xdr, result);
1421         if (unlikely(error))
1422                 goto out;
1423         if (status != NFS3_OK)
1424                 goto out_status;
1425 out:
1426         return error;
1427 out_status:
1428         return nfs3_stat_to_errno(status);
1429 }
1430 
1431 /*
1432  * 3.3.3  LOOKUP3res
1433  *
1434  *      struct LOOKUP3resok {
1435  *              nfs_fh3         object;
1436  *              post_op_attr    obj_attributes;
1437  *              post_op_attr    dir_attributes;
1438  *      };
1439  *
1440  *      struct LOOKUP3resfail {
1441  *              post_op_attr    dir_attributes;
1442  *      };
1443  *
1444  *      union LOOKUP3res switch (nfsstat3 status) {
1445  *      case NFS3_OK:
1446  *              LOOKUP3resok    resok;
1447  *      default:
1448  *              LOOKUP3resfail  resfail;
1449  *      };
1450  */
1451 static int nfs3_xdr_dec_lookup3res(struct rpc_rqst *req,
1452                                    struct xdr_stream *xdr,
1453                                    struct nfs3_diropres *result)
1454 {
1455         enum nfs_stat status;
1456         int error;
1457 
1458         error = decode_nfsstat3(xdr, &status);
1459         if (unlikely(error))
1460                 goto out;
1461         if (status != NFS3_OK)
1462                 goto out_default;
1463         error = decode_nfs_fh3(xdr, result->fh);
1464         if (unlikely(error))
1465                 goto out;
1466         error = decode_post_op_attr(xdr, result->fattr);
1467         if (unlikely(error))
1468                 goto out;
1469         error = decode_post_op_attr(xdr, result->dir_attr);
1470 out:
1471         return error;
1472 out_default:
1473         error = decode_post_op_attr(xdr, result->dir_attr);
1474         if (unlikely(error))
1475                 goto out;
1476         return nfs3_stat_to_errno(status);
1477 }
1478 
1479 /*
1480  * 3.3.4  ACCESS3res
1481  *
1482  *      struct ACCESS3resok {
1483  *              post_op_attr    obj_attributes;
1484  *              uint32          access;
1485  *      };
1486  *
1487  *      struct ACCESS3resfail {
1488  *              post_op_attr    obj_attributes;
1489  *      };
1490  *
1491  *      union ACCESS3res switch (nfsstat3 status) {
1492  *      case NFS3_OK:
1493  *              ACCESS3resok    resok;
1494  *      default:
1495  *              ACCESS3resfail  resfail;
1496  *      };
1497  */
1498 static int nfs3_xdr_dec_access3res(struct rpc_rqst *req,
1499                                    struct xdr_stream *xdr,
1500                                    struct nfs3_accessres *result)
1501 {
1502         enum nfs_stat status;
1503         int error;
1504 
1505         error = decode_nfsstat3(xdr, &status);
1506         if (unlikely(error))
1507                 goto out;
1508         error = decode_post_op_attr(xdr, result->fattr);
1509         if (unlikely(error))
1510                 goto out;
1511         if (status != NFS3_OK)
1512                 goto out_default;
1513         error = decode_uint32(xdr, &result->access);
1514 out:
1515         return error;
1516 out_default:
1517         return nfs3_stat_to_errno(status);
1518 }
1519 
1520 /*
1521  * 3.3.5  READLINK3res
1522  *
1523  *      struct READLINK3resok {
1524  *              post_op_attr    symlink_attributes;
1525  *              nfspath3        data;
1526  *      };
1527  *
1528  *      struct READLINK3resfail {
1529  *              post_op_attr    symlink_attributes;
1530  *      };
1531  *
1532  *      union READLINK3res switch (nfsstat3 status) {
1533  *      case NFS3_OK:
1534  *              READLINK3resok  resok;
1535  *      default:
1536  *              READLINK3resfail resfail;
1537  *      };
1538  */
1539 static int nfs3_xdr_dec_readlink3res(struct rpc_rqst *req,
1540                                      struct xdr_stream *xdr,
1541                                      struct nfs_fattr *result)
1542 {
1543         enum nfs_stat status;
1544         int error;
1545 
1546         error = decode_nfsstat3(xdr, &status);
1547         if (unlikely(error))
1548                 goto out;
1549         error = decode_post_op_attr(xdr, result);
1550         if (unlikely(error))
1551                 goto out;
1552         if (status != NFS3_OK)
1553                 goto out_default;
1554         error = decode_nfspath3(xdr);
1555 out:
1556         return error;
1557 out_default:
1558         return nfs3_stat_to_errno(status);
1559 }
1560 
1561 /*
1562  * 3.3.6  READ3res
1563  *
1564  *      struct READ3resok {
1565  *              post_op_attr    file_attributes;
1566  *              count3          count;
1567  *              bool            eof;
1568  *              opaque          data<>;
1569  *      };
1570  *
1571  *      struct READ3resfail {
1572  *              post_op_attr    file_attributes;
1573  *      };
1574  *
1575  *      union READ3res switch (nfsstat3 status) {
1576  *      case NFS3_OK:
1577  *              READ3resok      resok;
1578  *      default:
1579  *              READ3resfail    resfail;
1580  *      };
1581  */
1582 static int decode_read3resok(struct xdr_stream *xdr,
1583                              struct nfs_readres *result)
1584 {
1585         u32 eof, count, ocount, recvd;
1586         __be32 *p;
1587 
1588         p = xdr_inline_decode(xdr, 4 + 4 + 4);
1589         if (unlikely(p == NULL))
1590                 goto out_overflow;
1591         count = be32_to_cpup(p++);
1592         eof = be32_to_cpup(p++);
1593         ocount = be32_to_cpup(p++);
1594         if (unlikely(ocount != count))
1595                 goto out_mismatch;
1596         recvd = xdr_read_pages(xdr, count);
1597         if (unlikely(count > recvd))
1598                 goto out_cheating;
1599 out:
1600         result->eof = eof;
1601         result->count = count;
1602         return count;
1603 out_mismatch:
1604         dprintk("NFS: READ count doesn't match length of opaque: "
1605                 "count %u != ocount %u\n", count, ocount);
1606         return -EIO;
1607 out_cheating:
1608         dprintk("NFS: server cheating in read result: "
1609                 "count %u > recvd %u\n", count, recvd);
1610         count = recvd;
1611         eof = 0;
1612         goto out;
1613 out_overflow:
1614         print_overflow_msg(__func__, xdr);
1615         return -EIO;
1616 }
1617 
1618 static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1619                                  struct nfs_readres *result)
1620 {
1621         enum nfs_stat status;
1622         int error;
1623 
1624         error = decode_nfsstat3(xdr, &status);
1625         if (unlikely(error))
1626                 goto out;
1627         error = decode_post_op_attr(xdr, result->fattr);
1628         if (unlikely(error))
1629                 goto out;
1630         if (status != NFS3_OK)
1631                 goto out_status;
1632         error = decode_read3resok(xdr, result);
1633 out:
1634         return error;
1635 out_status:
1636         return nfs3_stat_to_errno(status);
1637 }
1638 
1639 /*
1640  * 3.3.7  WRITE3res
1641  *
1642  *      enum stable_how {
1643  *              UNSTABLE  = 0,
1644  *              DATA_SYNC = 1,
1645  *              FILE_SYNC = 2
1646  *      };
1647  *
1648  *      struct WRITE3resok {
1649  *              wcc_data        file_wcc;
1650  *              count3          count;
1651  *              stable_how      committed;
1652  *              writeverf3      verf;
1653  *      };
1654  *
1655  *      struct WRITE3resfail {
1656  *              wcc_data        file_wcc;
1657  *      };
1658  *
1659  *      union WRITE3res switch (nfsstat3 status) {
1660  *      case NFS3_OK:
1661  *              WRITE3resok     resok;
1662  *      default:
1663  *              WRITE3resfail   resfail;
1664  *      };
1665  */
1666 static int decode_write3resok(struct xdr_stream *xdr,
1667                               struct nfs_writeres *result)
1668 {
1669         __be32 *p;
1670 
1671         p = xdr_inline_decode(xdr, 4 + 4);
1672         if (unlikely(p == NULL))
1673                 goto out_overflow;
1674         result->count = be32_to_cpup(p++);
1675         result->verf->committed = be32_to_cpup(p++);
1676         if (unlikely(result->verf->committed > NFS_FILE_SYNC))
1677                 goto out_badvalue;
1678         if (decode_writeverf3(xdr, &result->verf->verifier))
1679                 goto out_eio;
1680         return result->count;
1681 out_badvalue:
1682         dprintk("NFS: bad stable_how value: %u\n", result->verf->committed);
1683         return -EIO;
1684 out_overflow:
1685         print_overflow_msg(__func__, xdr);
1686 out_eio:
1687         return -EIO;
1688 }
1689 
1690 static int nfs3_xdr_dec_write3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1691                                   struct nfs_writeres *result)
1692 {
1693         enum nfs_stat status;
1694         int error;
1695 
1696         error = decode_nfsstat3(xdr, &status);
1697         if (unlikely(error))
1698                 goto out;
1699         error = decode_wcc_data(xdr, result->fattr);
1700         if (unlikely(error))
1701                 goto out;
1702         if (status != NFS3_OK)
1703                 goto out_status;
1704         error = decode_write3resok(xdr, result);
1705 out:
1706         return error;
1707 out_status:
1708         return nfs3_stat_to_errno(status);
1709 }
1710 
1711 /*
1712  * 3.3.8  CREATE3res
1713  *
1714  *      struct CREATE3resok {
1715  *              post_op_fh3     obj;
1716  *              post_op_attr    obj_attributes;
1717  *              wcc_data        dir_wcc;
1718  *      };
1719  *
1720  *      struct CREATE3resfail {
1721  *              wcc_data        dir_wcc;
1722  *      };
1723  *
1724  *      union CREATE3res switch (nfsstat3 status) {
1725  *      case NFS3_OK:
1726  *              CREATE3resok    resok;
1727  *      default:
1728  *              CREATE3resfail  resfail;
1729  *      };
1730  */
1731 static int decode_create3resok(struct xdr_stream *xdr,
1732                                struct nfs3_diropres *result)
1733 {
1734         int error;
1735 
1736         error = decode_post_op_fh3(xdr, result->fh);
1737         if (unlikely(error))
1738                 goto out;
1739         error = decode_post_op_attr(xdr, result->fattr);
1740         if (unlikely(error))
1741                 goto out;
1742         /* The server isn't required to return a file handle.
1743          * If it didn't, force the client to perform a LOOKUP
1744          * to determine the correct file handle and attribute
1745          * values for the new object. */
1746         if (result->fh->size == 0)
1747                 result->fattr->valid = 0;
1748         error = decode_wcc_data(xdr, result->dir_attr);
1749 out:
1750         return error;
1751 }
1752 
1753 static int nfs3_xdr_dec_create3res(struct rpc_rqst *req,
1754                                    struct xdr_stream *xdr,
1755                                    struct nfs3_diropres *result)
1756 {
1757         enum nfs_stat status;
1758         int error;
1759 
1760         error = decode_nfsstat3(xdr, &status);
1761         if (unlikely(error))
1762                 goto out;
1763         if (status != NFS3_OK)
1764                 goto out_default;
1765         error = decode_create3resok(xdr, result);
1766 out:
1767         return error;
1768 out_default:
1769         error = decode_wcc_data(xdr, result->dir_attr);
1770         if (unlikely(error))
1771                 goto out;
1772         return nfs3_stat_to_errno(status);
1773 }
1774 
1775 /*
1776  * 3.3.12  REMOVE3res
1777  *
1778  *      struct REMOVE3resok {
1779  *              wcc_data    dir_wcc;
1780  *      };
1781  *
1782  *      struct REMOVE3resfail {
1783  *              wcc_data    dir_wcc;
1784  *      };
1785  *
1786  *      union REMOVE3res switch (nfsstat3 status) {
1787  *      case NFS3_OK:
1788  *              REMOVE3resok   resok;
1789  *      default:
1790  *              REMOVE3resfail resfail;
1791  *      };
1792  */
1793 static int nfs3_xdr_dec_remove3res(struct rpc_rqst *req,
1794                                    struct xdr_stream *xdr,
1795                                    struct nfs_removeres *result)
1796 {
1797         enum nfs_stat status;
1798         int error;
1799 
1800         error = decode_nfsstat3(xdr, &status);
1801         if (unlikely(error))
1802                 goto out;
1803         error = decode_wcc_data(xdr, result->dir_attr);
1804         if (unlikely(error))
1805                 goto out;
1806         if (status != NFS3_OK)
1807                 goto out_status;
1808 out:
1809         return error;
1810 out_status:
1811         return nfs3_stat_to_errno(status);
1812 }
1813 
1814 /*
1815  * 3.3.14  RENAME3res
1816  *
1817  *      struct RENAME3resok {
1818  *              wcc_data        fromdir_wcc;
1819  *              wcc_data        todir_wcc;
1820  *      };
1821  *
1822  *      struct RENAME3resfail {
1823  *              wcc_data        fromdir_wcc;
1824  *              wcc_data        todir_wcc;
1825  *      };
1826  *
1827  *      union RENAME3res switch (nfsstat3 status) {
1828  *      case NFS3_OK:
1829  *              RENAME3resok   resok;
1830  *      default:
1831  *              RENAME3resfail resfail;
1832  *      };
1833  */
1834 static int nfs3_xdr_dec_rename3res(struct rpc_rqst *req,
1835                                    struct xdr_stream *xdr,
1836                                    struct nfs_renameres *result)
1837 {
1838         enum nfs_stat status;
1839         int error;
1840 
1841         error = decode_nfsstat3(xdr, &status);
1842         if (unlikely(error))
1843                 goto out;
1844         error = decode_wcc_data(xdr, result->old_fattr);
1845         if (unlikely(error))
1846                 goto out;
1847         error = decode_wcc_data(xdr, result->new_fattr);
1848         if (unlikely(error))
1849                 goto out;
1850         if (status != NFS3_OK)
1851                 goto out_status;
1852 out:
1853         return error;
1854 out_status:
1855         return nfs3_stat_to_errno(status);
1856 }
1857 
1858 /*
1859  * 3.3.15  LINK3res
1860  *
1861  *      struct LINK3resok {
1862  *              post_op_attr    file_attributes;
1863  *              wcc_data        linkdir_wcc;
1864  *      };
1865  *
1866  *      struct LINK3resfail {
1867  *              post_op_attr    file_attributes;
1868  *              wcc_data        linkdir_wcc;
1869  *      };
1870  *
1871  *      union LINK3res switch (nfsstat3 status) {
1872  *      case NFS3_OK:
1873  *              LINK3resok      resok;
1874  *      default:
1875  *              LINK3resfail    resfail;
1876  *      };
1877  */
1878 static int nfs3_xdr_dec_link3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1879                                  struct nfs3_linkres *result)
1880 {
1881         enum nfs_stat status;
1882         int error;
1883 
1884         error = decode_nfsstat3(xdr, &status);
1885         if (unlikely(error))
1886                 goto out;
1887         error = decode_post_op_attr(xdr, result->fattr);
1888         if (unlikely(error))
1889                 goto out;
1890         error = decode_wcc_data(xdr, result->dir_attr);
1891         if (unlikely(error))
1892                 goto out;
1893         if (status != NFS3_OK)
1894                 goto out_status;
1895 out:
1896         return error;
1897 out_status:
1898         return nfs3_stat_to_errno(status);
1899 }
1900 
1901 /**
1902  * nfs3_decode_dirent - Decode a single NFSv3 directory entry stored in
1903  *                      the local page cache
1904  * @xdr: XDR stream where entry resides
1905  * @entry: buffer to fill in with entry data
1906  * @plus: boolean indicating whether this should be a readdirplus entry
1907  *
1908  * Returns zero if successful, otherwise a negative errno value is
1909  * returned.
1910  *
1911  * This function is not invoked during READDIR reply decoding, but
1912  * rather whenever an application invokes the getdents(2) system call
1913  * on a directory already in our cache.
1914  *
1915  * 3.3.16  entry3
1916  *
1917  *      struct entry3 {
1918  *              fileid3         fileid;
1919  *              filename3       name;
1920  *              cookie3         cookie;
1921  *              fhandle3        filehandle;
1922  *              post_op_attr3   attributes;
1923  *              entry3          *nextentry;
1924  *      };
1925  *
1926  * 3.3.17  entryplus3
1927  *      struct entryplus3 {
1928  *              fileid3         fileid;
1929  *              filename3       name;
1930  *              cookie3         cookie;
1931  *              post_op_attr    name_attributes;
1932  *              post_op_fh3     name_handle;
1933  *              entryplus3      *nextentry;
1934  *      };
1935  */
1936 int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
1937                        int plus)
1938 {
1939         struct nfs_entry old = *entry;
1940         __be32 *p;
1941         int error;
1942 
1943         p = xdr_inline_decode(xdr, 4);
1944         if (unlikely(p == NULL))
1945                 goto out_overflow;
1946         if (*p == xdr_zero) {
1947                 p = xdr_inline_decode(xdr, 4);
1948                 if (unlikely(p == NULL))
1949                         goto out_overflow;
1950                 if (*p == xdr_zero)
1951                         return -EAGAIN;
1952                 entry->eof = 1;
1953                 return -EBADCOOKIE;
1954         }
1955 
1956         error = decode_fileid3(xdr, &entry->ino);
1957         if (unlikely(error))
1958                 return error;
1959 
1960         error = decode_inline_filename3(xdr, &entry->name, &entry->len);
1961         if (unlikely(error))
1962                 return error;
1963 
1964         entry->prev_cookie = entry->cookie;
1965         error = decode_cookie3(xdr, &entry->cookie);
1966         if (unlikely(error))
1967                 return error;
1968 
1969         entry->d_type = DT_UNKNOWN;
1970 
1971         if (plus) {
1972                 entry->fattr->valid = 0;
1973                 error = decode_post_op_attr(xdr, entry->fattr);
1974                 if (unlikely(error))
1975                         return error;
1976                 if (entry->fattr->valid & NFS_ATTR_FATTR_V3)
1977                         entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);
1978 
1979                 /* In fact, a post_op_fh3: */
1980                 p = xdr_inline_decode(xdr, 4);
1981                 if (unlikely(p == NULL))
1982                         goto out_overflow;
1983                 if (*p != xdr_zero) {
1984                         error = decode_nfs_fh3(xdr, entry->fh);
1985                         if (unlikely(error)) {
1986                                 if (error == -E2BIG)
1987                                         goto out_truncated;
1988                                 return error;
1989                         }
1990                 } else
1991                         zero_nfs_fh3(entry->fh);
1992         }
1993 
1994         return 0;
1995 
1996 out_overflow:
1997         print_overflow_msg(__func__, xdr);
1998         return -EAGAIN;
1999 out_truncated:
2000         dprintk("NFS: directory entry contains invalid file handle\n");
2001         *entry = old;
2002         return -EAGAIN;
2003 }
2004 
2005 /*
2006  * 3.3.16  READDIR3res
2007  *
2008  *      struct dirlist3 {
2009  *              entry3          *entries;
2010  *              bool            eof;
2011  *      };
2012  *
2013  *      struct READDIR3resok {
2014  *              post_op_attr    dir_attributes;
2015  *              cookieverf3     cookieverf;
2016  *              dirlist3        reply;
2017  *      };
2018  *
2019  *      struct READDIR3resfail {
2020  *              post_op_attr    dir_attributes;
2021  *      };
2022  *
2023  *      union READDIR3res switch (nfsstat3 status) {
2024  *      case NFS3_OK:
2025  *              READDIR3resok   resok;
2026  *      default:
2027  *              READDIR3resfail resfail;
2028  *      };
2029  *
2030  * Read the directory contents into the page cache, but otherwise
2031  * don't touch them.  The actual decoding is done by nfs3_decode_entry()
2032  * during subsequent nfs_readdir() calls.
2033  */
2034 static int decode_dirlist3(struct xdr_stream *xdr)
2035 {
2036         return xdr_read_pages(xdr, xdr->buf->page_len);
2037 }
2038 
2039 static int decode_readdir3resok(struct xdr_stream *xdr,
2040                                 struct nfs3_readdirres *result)
2041 {
2042         int error;
2043 
2044         error = decode_post_op_attr(xdr, result->dir_attr);
2045         if (unlikely(error))
2046                 goto out;
2047         /* XXX: do we need to check if result->verf != NULL ? */
2048         error = decode_cookieverf3(xdr, result->verf);
2049         if (unlikely(error))
2050                 goto out;
2051         error = decode_dirlist3(xdr);
2052 out:
2053         return error;
2054 }
2055 
2056 static int nfs3_xdr_dec_readdir3res(struct rpc_rqst *req,
2057                                     struct xdr_stream *xdr,
2058                                     struct nfs3_readdirres *result)
2059 {
2060         enum nfs_stat status;
2061         int error;
2062 
2063         error = decode_nfsstat3(xdr, &status);
2064         if (unlikely(error))
2065                 goto out;
2066         if (status != NFS3_OK)
2067                 goto out_default;
2068         error = decode_readdir3resok(xdr, result);
2069 out:
2070         return error;
2071 out_default:
2072         error = decode_post_op_attr(xdr, result->dir_attr);
2073         if (unlikely(error))
2074                 goto out;
2075         return nfs3_stat_to_errno(status);
2076 }
2077 
2078 /*
2079  * 3.3.18  FSSTAT3res
2080  *
2081  *      struct FSSTAT3resok {
2082  *              post_op_attr    obj_attributes;
2083  *              size3           tbytes;
2084  *              size3           fbytes;
2085  *              size3           abytes;
2086  *              size3           tfiles;
2087  *              size3           ffiles;
2088  *              size3           afiles;
2089  *              uint32          invarsec;
2090  *      };
2091  *
2092  *      struct FSSTAT3resfail {
2093  *              post_op_attr    obj_attributes;
2094  *      };
2095  *
2096  *      union FSSTAT3res switch (nfsstat3 status) {
2097  *      case NFS3_OK:
2098  *              FSSTAT3resok    resok;
2099  *      default:
2100  *              FSSTAT3resfail  resfail;
2101  *      };
2102  */
2103 static int decode_fsstat3resok(struct xdr_stream *xdr,
2104                                struct nfs_fsstat *result)
2105 {
2106         __be32 *p;
2107 
2108         p = xdr_inline_decode(xdr, 8 * 6 + 4);
2109         if (unlikely(p == NULL))
2110                 goto out_overflow;
2111         p = xdr_decode_size3(p, &result->tbytes);
2112         p = xdr_decode_size3(p, &result->fbytes);
2113         p = xdr_decode_size3(p, &result->abytes);
2114         p = xdr_decode_size3(p, &result->tfiles);
2115         p = xdr_decode_size3(p, &result->ffiles);
2116         xdr_decode_size3(p, &result->afiles);
2117         /* ignore invarsec */
2118         return 0;
2119 out_overflow:
2120         print_overflow_msg(__func__, xdr);
2121         return -EIO;
2122 }
2123 
2124 static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req,
2125                                    struct xdr_stream *xdr,
2126                                    struct nfs_fsstat *result)
2127 {
2128         enum nfs_stat status;
2129         int error;
2130 
2131         error = decode_nfsstat3(xdr, &status);
2132         if (unlikely(error))
2133                 goto out;
2134         error = decode_post_op_attr(xdr, result->fattr);
2135         if (unlikely(error))
2136                 goto out;
2137         if (status != NFS3_OK)
2138                 goto out_status;
2139         error = decode_fsstat3resok(xdr, result);
2140 out:
2141         return error;
2142 out_status:
2143         return nfs3_stat_to_errno(status);
2144 }
2145 
2146 /*
2147  * 3.3.19  FSINFO3res
2148  *
2149  *      struct FSINFO3resok {
2150  *              post_op_attr    obj_attributes;
2151  *              uint32          rtmax;
2152  *              uint32          rtpref;
2153  *              uint32          rtmult;
2154  *              uint32          wtmax;
2155  *              uint32          wtpref;
2156  *              uint32          wtmult;
2157  *              uint32          dtpref;
2158  *              size3           maxfilesize;
2159  *              nfstime3        time_delta;
2160  *              uint32          properties;
2161  *      };
2162  *
2163  *      struct FSINFO3resfail {
2164  *              post_op_attr    obj_attributes;
2165  *      };
2166  *
2167  *      union FSINFO3res switch (nfsstat3 status) {
2168  *      case NFS3_OK:
2169  *              FSINFO3resok    resok;
2170  *      default:
2171  *              FSINFO3resfail  resfail;
2172  *      };
2173  */
2174 static int decode_fsinfo3resok(struct xdr_stream *xdr,
2175                                struct nfs_fsinfo *result)
2176 {
2177         __be32 *p;
2178 
2179         p = xdr_inline_decode(xdr, 4 * 7 + 8 + 8 + 4);
2180         if (unlikely(p == NULL))
2181                 goto out_overflow;
2182         result->rtmax  = be32_to_cpup(p++);
2183         result->rtpref = be32_to_cpup(p++);
2184         result->rtmult = be32_to_cpup(p++);
2185         result->wtmax  = be32_to_cpup(p++);
2186         result->wtpref = be32_to_cpup(p++);
2187         result->wtmult = be32_to_cpup(p++);
2188         result->dtpref = be32_to_cpup(p++);
2189         p = xdr_decode_size3(p, &result->maxfilesize);
2190         xdr_decode_nfstime3(p, &result->time_delta);
2191 
2192         /* ignore properties */
2193         result->lease_time = 0;
2194         return 0;
2195 out_overflow:
2196         print_overflow_msg(__func__, xdr);
2197         return -EIO;
2198 }
2199 
2200 static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req,
2201                                    struct xdr_stream *xdr,
2202                                    struct nfs_fsinfo *result)
2203 {
2204         enum nfs_stat status;
2205         int error;
2206 
2207         error = decode_nfsstat3(xdr, &status);
2208         if (unlikely(error))
2209                 goto out;
2210         error = decode_post_op_attr(xdr, result->fattr);
2211         if (unlikely(error))
2212                 goto out;
2213         if (status != NFS3_OK)
2214                 goto out_status;
2215         error = decode_fsinfo3resok(xdr, result);
2216 out:
2217         return error;
2218 out_status:
2219         return nfs3_stat_to_errno(status);
2220 }
2221 
2222 /*
2223  * 3.3.20  PATHCONF3res
2224  *
2225  *      struct PATHCONF3resok {
2226  *              post_op_attr    obj_attributes;
2227  *              uint32          linkmax;
2228  *              uint32          name_max;
2229  *              bool            no_trunc;
2230  *              bool            chown_restricted;
2231  *              bool            case_insensitive;
2232  *              bool            case_preserving;
2233  *      };
2234  *
2235  *      struct PATHCONF3resfail {
2236  *              post_op_attr    obj_attributes;
2237  *      };
2238  *
2239  *      union PATHCONF3res switch (nfsstat3 status) {
2240  *      case NFS3_OK:
2241  *              PATHCONF3resok  resok;
2242  *      default:
2243  *              PATHCONF3resfail resfail;
2244  *      };
2245  */
2246 static int decode_pathconf3resok(struct xdr_stream *xdr,
2247                                  struct nfs_pathconf *result)
2248 {
2249         __be32 *p;
2250 
2251         p = xdr_inline_decode(xdr, 4 * 6);
2252         if (unlikely(p == NULL))
2253                 goto out_overflow;
2254         result->max_link = be32_to_cpup(p++);
2255         result->max_namelen = be32_to_cpup(p);
2256         /* ignore remaining fields */
2257         return 0;
2258 out_overflow:
2259         print_overflow_msg(__func__, xdr);
2260         return -EIO;
2261 }
2262 
2263 static int nfs3_xdr_dec_pathconf3res(struct rpc_rqst *req,
2264                                      struct xdr_stream *xdr,
2265                                      struct nfs_pathconf *result)
2266 {
2267         enum nfs_stat status;
2268         int error;
2269 
2270         error = decode_nfsstat3(xdr, &status);
2271         if (unlikely(error))
2272                 goto out;
2273         error = decode_post_op_attr(xdr, result->fattr);
2274         if (unlikely(error))
2275                 goto out;
2276         if (status != NFS3_OK)
2277                 goto out_status;
2278         error = decode_pathconf3resok(xdr, result);
2279 out:
2280         return error;
2281 out_status:
2282         return nfs3_stat_to_errno(status);
2283 }
2284 
2285 /*
2286  * 3.3.21  COMMIT3res
2287  *
2288  *      struct COMMIT3resok {
2289  *              wcc_data        file_wcc;
2290  *              writeverf3      verf;
2291  *      };
2292  *
2293  *      struct COMMIT3resfail {
2294  *              wcc_data        file_wcc;
2295  *      };
2296  *
2297  *      union COMMIT3res switch (nfsstat3 status) {
2298  *      case NFS3_OK:
2299  *              COMMIT3resok    resok;
2300  *      default:
2301  *              COMMIT3resfail  resfail;
2302  *      };
2303  */
2304 static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req,
2305                                    struct xdr_stream *xdr,
2306                                    struct nfs_commitres *result)
2307 {
2308         enum nfs_stat status;
2309         int error;
2310 
2311         error = decode_nfsstat3(xdr, &status);
2312         if (unlikely(error))
2313                 goto out;
2314         error = decode_wcc_data(xdr, result->fattr);
2315         if (unlikely(error))
2316                 goto out;
2317         if (status != NFS3_OK)
2318                 goto out_status;
2319         error = decode_writeverf3(xdr, &result->verf->verifier);
2320 out:
2321         return error;
2322 out_status:
2323         return nfs3_stat_to_errno(status);
2324 }
2325 
2326 #ifdef CONFIG_NFS_V3_ACL
2327 
2328 static inline int decode_getacl3resok(struct xdr_stream *xdr,
2329                                       struct nfs3_getaclres *result)
2330 {
2331         struct posix_acl **acl;
2332         unsigned int *aclcnt;
2333         size_t hdrlen;
2334         int error;
2335 
2336         error = decode_post_op_attr(xdr, result->fattr);
2337         if (unlikely(error))
2338                 goto out;
2339         error = decode_uint32(xdr, &result->mask);
2340         if (unlikely(error))
2341                 goto out;
2342         error = -EINVAL;
2343         if (result->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
2344                 goto out;
2345 
2346         hdrlen = xdr_stream_pos(xdr);
2347 
2348         acl = NULL;
2349         if (result->mask & NFS_ACL)
2350                 acl = &result->acl_access;
2351         aclcnt = NULL;
2352         if (result->mask & NFS_ACLCNT)
2353                 aclcnt = &result->acl_access_count;
2354         error = nfsacl_decode(xdr->buf, hdrlen, aclcnt, acl);
2355         if (unlikely(error <= 0))
2356                 goto out;
2357 
2358         acl = NULL;
2359         if (result->mask & NFS_DFACL)
2360                 acl = &result->acl_default;
2361         aclcnt = NULL;
2362         if (result->mask & NFS_DFACLCNT)
2363                 aclcnt = &result->acl_default_count;
2364         error = nfsacl_decode(xdr->buf, hdrlen + error, aclcnt, acl);
2365         if (unlikely(error <= 0))
2366                 return error;
2367         error = 0;
2368 out:
2369         return error;
2370 }
2371 
2372 static int nfs3_xdr_dec_getacl3res(struct rpc_rqst *req,
2373                                    struct xdr_stream *xdr,
2374                                    struct nfs3_getaclres *result)
2375 {
2376         enum nfs_stat status;
2377         int error;
2378 
2379         error = decode_nfsstat3(xdr, &status);
2380         if (unlikely(error))
2381                 goto out;
2382         if (status != NFS3_OK)
2383                 goto out_default;
2384         error = decode_getacl3resok(xdr, result);
2385 out:
2386         return error;
2387 out_default:
2388         return nfs3_stat_to_errno(status);
2389 }
2390 
2391 static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req,
2392                                    struct xdr_stream *xdr,
2393                                    struct nfs_fattr *result)
2394 {
2395         enum nfs_stat status;
2396         int error;
2397 
2398         error = decode_nfsstat3(xdr, &status);
2399         if (unlikely(error))
2400                 goto out;
2401         if (status != NFS3_OK)
2402                 goto out_default;
2403         error = decode_post_op_attr(xdr, result);
2404 out:
2405         return error;
2406 out_default:
2407         return nfs3_stat_to_errno(status);
2408 }
2409 
2410 #endif  /* CONFIG_NFS_V3_ACL */
2411 
2412 
2413 /*
2414  * We need to translate between nfs status return values and
2415  * the local errno values which may not be the same.
2416  */
2417 static const struct {
2418         int stat;
2419         int errno;
2420 } nfs_errtbl[] = {
2421         { NFS_OK,               0               },
2422         { NFSERR_PERM,          -EPERM          },
2423         { NFSERR_NOENT,         -ENOENT         },
2424         { NFSERR_IO,            -errno_NFSERR_IO},
2425         { NFSERR_NXIO,          -ENXIO          },
2426 /*      { NFSERR_EAGAIN,        -EAGAIN         }, */
2427         { NFSERR_ACCES,         -EACCES         },
2428         { NFSERR_EXIST,         -EEXIST         },
2429         { NFSERR_XDEV,          -EXDEV          },
2430         { NFSERR_NODEV,         -ENODEV         },
2431         { NFSERR_NOTDIR,        -ENOTDIR        },
2432         { NFSERR_ISDIR,         -EISDIR         },
2433         { NFSERR_INVAL,         -EINVAL         },
2434         { NFSERR_FBIG,          -EFBIG          },
2435         { NFSERR_NOSPC,         -ENOSPC         },
2436         { NFSERR_ROFS,          -EROFS          },
2437         { NFSERR_MLINK,         -EMLINK         },
2438         { NFSERR_NAMETOOLONG,   -ENAMETOOLONG   },
2439         { NFSERR_NOTEMPTY,      -ENOTEMPTY      },
2440         { NFSERR_DQUOT,         -EDQUOT         },
2441         { NFSERR_STALE,         -ESTALE         },
2442         { NFSERR_REMOTE,        -EREMOTE        },
2443 #ifdef EWFLUSH
2444         { NFSERR_WFLUSH,        -EWFLUSH        },
2445 #endif
2446         { NFSERR_BADHANDLE,     -EBADHANDLE     },
2447         { NFSERR_NOT_SYNC,      -ENOTSYNC       },
2448         { NFSERR_BAD_COOKIE,    -EBADCOOKIE     },
2449         { NFSERR_NOTSUPP,       -ENOTSUPP       },
2450         { NFSERR_TOOSMALL,      -ETOOSMALL      },
2451         { NFSERR_SERVERFAULT,   -EREMOTEIO      },
2452         { NFSERR_BADTYPE,       -EBADTYPE       },
2453         { NFSERR_JUKEBOX,       -EJUKEBOX       },
2454         { -1,                   -EIO            }
2455 };
2456 
2457 /**
2458  * nfs3_stat_to_errno - convert an NFS status code to a local errno
2459  * @status: NFS status code to convert
2460  *
2461  * Returns a local errno value, or -EIO if the NFS status code is
2462  * not recognized.  This function is used jointly by NFSv2 and NFSv3.
2463  */
2464 static int nfs3_stat_to_errno(enum nfs_stat status)
2465 {
2466         int i;
2467 
2468         for (i = 0; nfs_errtbl[i].stat != -1; i++) {
2469                 if (nfs_errtbl[i].stat == (int)status)
2470                         return nfs_errtbl[i].errno;
2471         }
2472         dprintk("NFS: Unrecognized nfs status value: %u\n", status);
2473         return nfs_errtbl[i].errno;
2474 }
2475 
2476 
2477 #define PROC(proc, argtype, restype, timer)                             \
2478 [NFS3PROC_##proc] = {                                                   \
2479         .p_proc      = NFS3PROC_##proc,                                 \
2480         .p_encode    = (kxdreproc_t)nfs3_xdr_enc_##argtype##3args,      \
2481         .p_decode    = (kxdrdproc_t)nfs3_xdr_dec_##restype##3res,       \
2482         .p_arglen    = NFS3_##argtype##args_sz,                         \
2483         .p_replen    = NFS3_##restype##res_sz,                          \
2484         .p_timer     = timer,                                           \
2485         .p_statidx   = NFS3PROC_##proc,                                 \
2486         .p_name      = #proc,                                           \
2487         }
2488 
2489 struct rpc_procinfo     nfs3_procedures[] = {
2490         PROC(GETATTR,           getattr,        getattr,        1),
2491         PROC(SETATTR,           setattr,        setattr,        0),
2492         PROC(LOOKUP,            lookup,         lookup,         2),
2493         PROC(ACCESS,            access,         access,         1),
2494         PROC(READLINK,          readlink,       readlink,       3),
2495         PROC(READ,              read,           read,           3),
2496         PROC(WRITE,             write,          write,          4),
2497         PROC(CREATE,            create,         create,         0),
2498         PROC(MKDIR,             mkdir,          create,         0),
2499         PROC(SYMLINK,           symlink,        create,         0),
2500         PROC(MKNOD,             mknod,          create,         0),
2501         PROC(REMOVE,            remove,         remove,         0),
2502         PROC(RMDIR,             lookup,         setattr,        0),
2503         PROC(RENAME,            rename,         rename,         0),
2504         PROC(LINK,              link,           link,           0),
2505         PROC(READDIR,           readdir,        readdir,        3),
2506         PROC(READDIRPLUS,       readdirplus,    readdir,        3),
2507         PROC(FSSTAT,            getattr,        fsstat,         0),
2508         PROC(FSINFO,            getattr,        fsinfo,         0),
2509         PROC(PATHCONF,          getattr,        pathconf,       0),
2510         PROC(COMMIT,            commit,         commit,         5),
2511 };
2512 
2513 const struct rpc_version nfs_version3 = {
2514         .number                 = 3,
2515         .nrprocs                = ARRAY_SIZE(nfs3_procedures),
2516         .procs                  = nfs3_procedures
2517 };
2518 
2519 #ifdef CONFIG_NFS_V3_ACL
2520 static struct rpc_procinfo      nfs3_acl_procedures[] = {
2521         [ACLPROC3_GETACL] = {
2522                 .p_proc = ACLPROC3_GETACL,
2523                 .p_encode = (kxdreproc_t)nfs3_xdr_enc_getacl3args,
2524                 .p_decode = (kxdrdproc_t)nfs3_xdr_dec_getacl3res,
2525                 .p_arglen = ACL3_getaclargs_sz,
2526                 .p_replen = ACL3_getaclres_sz,
2527                 .p_timer = 1,
2528                 .p_name = "GETACL",
2529         },
2530         [ACLPROC3_SETACL] = {
2531                 .p_proc = ACLPROC3_SETACL,
2532                 .p_encode = (kxdreproc_t)nfs3_xdr_enc_setacl3args,
2533                 .p_decode = (kxdrdproc_t)nfs3_xdr_dec_setacl3res,
2534                 .p_arglen = ACL3_setaclargs_sz,
2535                 .p_replen = ACL3_setaclres_sz,
2536                 .p_timer = 0,
2537                 .p_name = "SETACL",
2538         },
2539 };
2540 
2541 const struct rpc_version nfsacl_version3 = {
2542         .number                 = 3,
2543         .nrprocs                = sizeof(nfs3_acl_procedures)/
2544                                   sizeof(nfs3_acl_procedures[0]),
2545         .procs                  = nfs3_acl_procedures,
2546 };
2547 #endif  /* CONFIG_NFS_V3_ACL */
2548 

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