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

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * linux/fs/nfs/nfs3xdr.c
  4  *
  5  * XDR functions to encode/decode NFSv3 RPC arguments and results.
  6  *
  7  * Copyright (C) 1996, 1997 Olaf Kirch
  8  */
  9 
 10 #include <linux/param.h>
 11 #include <linux/time.h>
 12 #include <linux/mm.h>
 13 #include <linux/errno.h>
 14 #include <linux/string.h>
 15 #include <linux/in.h>
 16 #include <linux/pagemap.h>
 17 #include <linux/proc_fs.h>
 18 #include <linux/kdev_t.h>
 19 #include <linux/sunrpc/clnt.h>
 20 #include <linux/nfs.h>
 21 #include <linux/nfs3.h>
 22 #include <linux/nfs_fs.h>
 23 #include <linux/nfsacl.h>
 24 #include "internal.h"
 25 
 26 #define NFSDBG_FACILITY         NFSDBG_XDR
 27 
 28 /* Mapping from NFS error code to "errno" error code. */
 29 #define errno_NFSERR_IO         EIO
 30 
 31 /*
 32  * Declare the space requirements for NFS arguments and replies as
 33  * number of 32bit-words
 34  */
 35 #define NFS3_fhandle_sz         (1+16)
 36 #define NFS3_fh_sz              (NFS3_fhandle_sz)       /* shorthand */
 37 #define NFS3_sattr_sz           (15)
 38 #define NFS3_filename_sz        (1+(NFS3_MAXNAMLEN>>2))
 39 #define NFS3_path_sz            (1+(NFS3_MAXPATHLEN>>2))
 40 #define NFS3_fattr_sz           (21)
 41 #define NFS3_cookieverf_sz      (NFS3_COOKIEVERFSIZE>>2)
 42 #define NFS3_wcc_attr_sz        (6)
 43 #define NFS3_pre_op_attr_sz     (1+NFS3_wcc_attr_sz)
 44 #define NFS3_post_op_attr_sz    (1+NFS3_fattr_sz)
 45 #define NFS3_wcc_data_sz        (NFS3_pre_op_attr_sz+NFS3_post_op_attr_sz)
 46 #define NFS3_diropargs_sz       (NFS3_fh_sz+NFS3_filename_sz)
 47 
 48 #define NFS3_getattrargs_sz     (NFS3_fh_sz)
 49 #define NFS3_setattrargs_sz     (NFS3_fh_sz+NFS3_sattr_sz+3)
 50 #define NFS3_lookupargs_sz      (NFS3_fh_sz+NFS3_filename_sz)
 51 #define NFS3_accessargs_sz      (NFS3_fh_sz+1)
 52 #define NFS3_readlinkargs_sz    (NFS3_fh_sz)
 53 #define NFS3_readargs_sz        (NFS3_fh_sz+3)
 54 #define NFS3_writeargs_sz       (NFS3_fh_sz+5)
 55 #define NFS3_createargs_sz      (NFS3_diropargs_sz+NFS3_sattr_sz)
 56 #define NFS3_mkdirargs_sz       (NFS3_diropargs_sz+NFS3_sattr_sz)
 57 #define NFS3_symlinkargs_sz     (NFS3_diropargs_sz+1+NFS3_sattr_sz)
 58 #define NFS3_mknodargs_sz       (NFS3_diropargs_sz+2+NFS3_sattr_sz)
 59 #define NFS3_removeargs_sz      (NFS3_fh_sz+NFS3_filename_sz)
 60 #define NFS3_renameargs_sz      (NFS3_diropargs_sz+NFS3_diropargs_sz)
 61 #define NFS3_linkargs_sz                (NFS3_fh_sz+NFS3_diropargs_sz)
 62 #define NFS3_readdirargs_sz     (NFS3_fh_sz+NFS3_cookieverf_sz+3)
 63 #define NFS3_readdirplusargs_sz (NFS3_fh_sz+NFS3_cookieverf_sz+4)
 64 #define NFS3_commitargs_sz      (NFS3_fh_sz+3)
 65 
 66 #define NFS3_getattrres_sz      (1+NFS3_fattr_sz)
 67 #define NFS3_setattrres_sz      (1+NFS3_wcc_data_sz)
 68 #define NFS3_removeres_sz       (NFS3_setattrres_sz)
 69 #define NFS3_lookupres_sz       (1+NFS3_fh_sz+(2 * NFS3_post_op_attr_sz))
 70 #define NFS3_accessres_sz       (1+NFS3_post_op_attr_sz+1)
 71 #define NFS3_readlinkres_sz     (1+NFS3_post_op_attr_sz+1)
 72 #define NFS3_readres_sz         (1+NFS3_post_op_attr_sz+3)
 73 #define NFS3_writeres_sz        (1+NFS3_wcc_data_sz+4)
 74 #define NFS3_createres_sz       (1+NFS3_fh_sz+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
 75 #define NFS3_renameres_sz       (1+(2 * NFS3_wcc_data_sz))
 76 #define NFS3_linkres_sz         (1+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
 77 #define NFS3_readdirres_sz      (1+NFS3_post_op_attr_sz+2)
 78 #define NFS3_fsstatres_sz       (1+NFS3_post_op_attr_sz+13)
 79 #define NFS3_fsinfores_sz       (1+NFS3_post_op_attr_sz+12)
 80 #define NFS3_pathconfres_sz     (1+NFS3_post_op_attr_sz+6)
 81 #define NFS3_commitres_sz       (1+NFS3_wcc_data_sz+2)
 82 
 83 #define ACL3_getaclargs_sz      (NFS3_fh_sz+1)
 84 #define ACL3_setaclargs_sz      (NFS3_fh_sz+1+ \
 85                                 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
 86 #define ACL3_getaclres_sz       (1+NFS3_post_op_attr_sz+1+ \
 87                                 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
 88 #define ACL3_setaclres_sz       (1+NFS3_post_op_attr_sz)
 89 
 90 static int nfs3_stat_to_errno(enum nfs_stat);
 91 
 92 /*
 93  * Map file type to S_IFMT bits
 94  */
 95 static const umode_t nfs_type2fmt[] = {
 96         [NF3BAD] = 0,
 97         [NF3REG] = S_IFREG,
 98         [NF3DIR] = S_IFDIR,
 99         [NF3BLK] = S_IFBLK,
100         [NF3CHR] = S_IFCHR,
101         [NF3LNK] = S_IFLNK,
102         [NF3SOCK] = S_IFSOCK,
103         [NF3FIFO] = S_IFIFO,
104 };
105 
106 /*
107  * While encoding arguments, set up the reply buffer in advance to
108  * receive reply data directly into the page cache.
109  */
110 static void prepare_reply_buffer(struct rpc_rqst *req, struct page **pages,
111                                  unsigned int base, unsigned int len,
112                                  unsigned int bufsize)
113 {
114         struct rpc_auth *auth = req->rq_cred->cr_auth;
115         unsigned int replen;
116 
117         replen = RPC_REPHDRSIZE + auth->au_rslack + bufsize;
118         xdr_inline_pages(&req->rq_rcv_buf, replen << 2, pages, base, len);
119 }
120 
121 /*
122  * Handle decode buffer overflows out-of-line.
123  */
124 static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
125 {
126         dprintk("NFS: %s prematurely hit the end of our receive buffer. "
127                 "Remaining buffer length is %tu words.\n",
128                 func, xdr->end - xdr->p);
129 }
130 
131 
132 /*
133  * Encode/decode NFSv3 basic data types
134  *
135  * Basic NFSv3 data types are defined in section 2.5 of RFC 1813:
136  * "NFS Version 3 Protocol Specification".
137  *
138  * Not all basic data types have their own encoding and decoding
139  * functions.  For run-time efficiency, some data types are encoded
140  * or decoded inline.
141  */
142 
143 static void encode_uint32(struct xdr_stream *xdr, u32 value)
144 {
145         __be32 *p = xdr_reserve_space(xdr, 4);
146         *p = cpu_to_be32(value);
147 }
148 
149 static int decode_uint32(struct xdr_stream *xdr, u32 *value)
150 {
151         __be32 *p;
152 
153         p = xdr_inline_decode(xdr, 4);
154         if (unlikely(p == NULL))
155                 goto out_overflow;
156         *value = be32_to_cpup(p);
157         return 0;
158 out_overflow:
159         print_overflow_msg(__func__, xdr);
160         return -EIO;
161 }
162 
163 static int decode_uint64(struct xdr_stream *xdr, u64 *value)
164 {
165         __be32 *p;
166 
167         p = xdr_inline_decode(xdr, 8);
168         if (unlikely(p == NULL))
169                 goto out_overflow;
170         xdr_decode_hyper(p, value);
171         return 0;
172 out_overflow:
173         print_overflow_msg(__func__, xdr);
174         return -EIO;
175 }
176 
177 /*
178  * fileid3
179  *
180  *      typedef uint64 fileid3;
181  */
182 static __be32 *xdr_decode_fileid3(__be32 *p, u64 *fileid)
183 {
184         return xdr_decode_hyper(p, fileid);
185 }
186 
187 static int decode_fileid3(struct xdr_stream *xdr, u64 *fileid)
188 {
189         return decode_uint64(xdr, fileid);
190 }
191 
192 /*
193  * filename3
194  *
195  *      typedef string filename3<>;
196  */
197 static void encode_filename3(struct xdr_stream *xdr,
198                              const char *name, u32 length)
199 {
200         __be32 *p;
201 
202         WARN_ON_ONCE(length > NFS3_MAXNAMLEN);
203         p = xdr_reserve_space(xdr, 4 + length);
204         xdr_encode_opaque(p, name, length);
205 }
206 
207 static int decode_inline_filename3(struct xdr_stream *xdr,
208                                    const char **name, u32 *length)
209 {
210         __be32 *p;
211         u32 count;
212 
213         p = xdr_inline_decode(xdr, 4);
214         if (unlikely(p == NULL))
215                 goto out_overflow;
216         count = be32_to_cpup(p);
217         if (count > NFS3_MAXNAMLEN)
218                 goto out_nametoolong;
219         p = xdr_inline_decode(xdr, count);
220         if (unlikely(p == NULL))
221                 goto out_overflow;
222         *name = (const char *)p;
223         *length = count;
224         return 0;
225 
226 out_nametoolong:
227         dprintk("NFS: returned filename too long: %u\n", count);
228         return -ENAMETOOLONG;
229 out_overflow:
230         print_overflow_msg(__func__, xdr);
231         return -EIO;
232 }
233 
234 /*
235  * nfspath3
236  *
237  *      typedef string nfspath3<>;
238  */
239 static void encode_nfspath3(struct xdr_stream *xdr, struct page **pages,
240                             const u32 length)
241 {
242         encode_uint32(xdr, length);
243         xdr_write_pages(xdr, pages, 0, length);
244 }
245 
246 static int decode_nfspath3(struct xdr_stream *xdr)
247 {
248         u32 recvd, count;
249         __be32 *p;
250 
251         p = xdr_inline_decode(xdr, 4);
252         if (unlikely(p == NULL))
253                 goto out_overflow;
254         count = be32_to_cpup(p);
255         if (unlikely(count >= xdr->buf->page_len || count > NFS3_MAXPATHLEN))
256                 goto out_nametoolong;
257         recvd = xdr_read_pages(xdr, count);
258         if (unlikely(count > recvd))
259                 goto out_cheating;
260         xdr_terminate_string(xdr->buf, count);
261         return 0;
262 
263 out_nametoolong:
264         dprintk("NFS: returned pathname too long: %u\n", count);
265         return -ENAMETOOLONG;
266 out_cheating:
267         dprintk("NFS: server cheating in pathname result: "
268                 "count %u > recvd %u\n", count, recvd);
269         return -EIO;
270 out_overflow:
271         print_overflow_msg(__func__, xdr);
272         return -EIO;
273 }
274 
275 /*
276  * cookie3
277  *
278  *      typedef uint64 cookie3
279  */
280 static __be32 *xdr_encode_cookie3(__be32 *p, u64 cookie)
281 {
282         return xdr_encode_hyper(p, cookie);
283 }
284 
285 static int decode_cookie3(struct xdr_stream *xdr, u64 *cookie)
286 {
287         return decode_uint64(xdr, cookie);
288 }
289 
290 /*
291  * cookieverf3
292  *
293  *      typedef opaque cookieverf3[NFS3_COOKIEVERFSIZE];
294  */
295 static __be32 *xdr_encode_cookieverf3(__be32 *p, const __be32 *verifier)
296 {
297         memcpy(p, verifier, NFS3_COOKIEVERFSIZE);
298         return p + XDR_QUADLEN(NFS3_COOKIEVERFSIZE);
299 }
300 
301 static int decode_cookieverf3(struct xdr_stream *xdr, __be32 *verifier)
302 {
303         __be32 *p;
304 
305         p = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE);
306         if (unlikely(p == NULL))
307                 goto out_overflow;
308         memcpy(verifier, p, NFS3_COOKIEVERFSIZE);
309         return 0;
310 out_overflow:
311         print_overflow_msg(__func__, xdr);
312         return -EIO;
313 }
314 
315 /*
316  * createverf3
317  *
318  *      typedef opaque createverf3[NFS3_CREATEVERFSIZE];
319  */
320 static void encode_createverf3(struct xdr_stream *xdr, const __be32 *verifier)
321 {
322         __be32 *p;
323 
324         p = xdr_reserve_space(xdr, NFS3_CREATEVERFSIZE);
325         memcpy(p, verifier, NFS3_CREATEVERFSIZE);
326 }
327 
328 static int decode_writeverf3(struct xdr_stream *xdr, struct nfs_write_verifier *verifier)
329 {
330         __be32 *p;
331 
332         p = xdr_inline_decode(xdr, NFS3_WRITEVERFSIZE);
333         if (unlikely(p == NULL))
334                 goto out_overflow;
335         memcpy(verifier->data, p, NFS3_WRITEVERFSIZE);
336         return 0;
337 out_overflow:
338         print_overflow_msg(__func__, xdr);
339         return -EIO;
340 }
341 
342 /*
343  * size3
344  *
345  *      typedef uint64 size3;
346  */
347 static __be32 *xdr_decode_size3(__be32 *p, u64 *size)
348 {
349         return xdr_decode_hyper(p, size);
350 }
351 
352 /*
353  * nfsstat3
354  *
355  *      enum nfsstat3 {
356  *              NFS3_OK = 0,
357  *              ...
358  *      }
359  */
360 #define NFS3_OK         NFS_OK
361 
362 static int decode_nfsstat3(struct xdr_stream *xdr, enum nfs_stat *status)
363 {
364         __be32 *p;
365 
366         p = xdr_inline_decode(xdr, 4);
367         if (unlikely(p == NULL))
368                 goto out_overflow;
369         *status = be32_to_cpup(p);
370         return 0;
371 out_overflow:
372         print_overflow_msg(__func__, xdr);
373         return -EIO;
374 }
375 
376 /*
377  * ftype3
378  *
379  *      enum ftype3 {
380  *              NF3REG  = 1,
381  *              NF3DIR  = 2,
382  *              NF3BLK  = 3,
383  *              NF3CHR  = 4,
384  *              NF3LNK  = 5,
385  *              NF3SOCK = 6,
386  *              NF3FIFO = 7
387  *      };
388  */
389 static void encode_ftype3(struct xdr_stream *xdr, const u32 type)
390 {
391         encode_uint32(xdr, type);
392 }
393 
394 static __be32 *xdr_decode_ftype3(__be32 *p, umode_t *mode)
395 {
396         u32 type;
397 
398         type = be32_to_cpup(p++);
399         if (type > NF3FIFO)
400                 type = NF3NON;
401         *mode = nfs_type2fmt[type];
402         return p;
403 }
404 
405 /*
406  * specdata3
407  *
408  *     struct specdata3 {
409  *             uint32  specdata1;
410  *             uint32  specdata2;
411  *     };
412  */
413 static void encode_specdata3(struct xdr_stream *xdr, const dev_t rdev)
414 {
415         __be32 *p;
416 
417         p = xdr_reserve_space(xdr, 8);
418         *p++ = cpu_to_be32(MAJOR(rdev));
419         *p = cpu_to_be32(MINOR(rdev));
420 }
421 
422 static __be32 *xdr_decode_specdata3(__be32 *p, dev_t *rdev)
423 {
424         unsigned int major, minor;
425 
426         major = be32_to_cpup(p++);
427         minor = be32_to_cpup(p++);
428         *rdev = MKDEV(major, minor);
429         if (MAJOR(*rdev) != major || MINOR(*rdev) != minor)
430                 *rdev = 0;
431         return p;
432 }
433 
434 /*
435  * nfs_fh3
436  *
437  *      struct nfs_fh3 {
438  *              opaque       data<NFS3_FHSIZE>;
439  *      };
440  */
441 static void encode_nfs_fh3(struct xdr_stream *xdr, const struct nfs_fh *fh)
442 {
443         __be32 *p;
444 
445         WARN_ON_ONCE(fh->size > NFS3_FHSIZE);
446         p = xdr_reserve_space(xdr, 4 + fh->size);
447         xdr_encode_opaque(p, fh->data, fh->size);
448 }
449 
450 static int decode_nfs_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
451 {
452         u32 length;
453         __be32 *p;
454 
455         p = xdr_inline_decode(xdr, 4);
456         if (unlikely(p == NULL))
457                 goto out_overflow;
458         length = be32_to_cpup(p++);
459         if (unlikely(length > NFS3_FHSIZE))
460                 goto out_toobig;
461         p = xdr_inline_decode(xdr, length);
462         if (unlikely(p == NULL))
463                 goto out_overflow;
464         fh->size = length;
465         memcpy(fh->data, p, length);
466         return 0;
467 out_toobig:
468         dprintk("NFS: file handle size (%u) too big\n", length);
469         return -E2BIG;
470 out_overflow:
471         print_overflow_msg(__func__, xdr);
472         return -EIO;
473 }
474 
475 static void zero_nfs_fh3(struct nfs_fh *fh)
476 {
477         memset(fh, 0, sizeof(*fh));
478 }
479 
480 /*
481  * nfstime3
482  *
483  *      struct nfstime3 {
484  *              uint32  seconds;
485  *              uint32  nseconds;
486  *      };
487  */
488 static __be32 *xdr_encode_nfstime3(__be32 *p, const struct timespec *timep)
489 {
490         *p++ = cpu_to_be32(timep->tv_sec);
491         *p++ = cpu_to_be32(timep->tv_nsec);
492         return p;
493 }
494 
495 static __be32 *xdr_decode_nfstime3(__be32 *p, struct timespec *timep)
496 {
497         timep->tv_sec = be32_to_cpup(p++);
498         timep->tv_nsec = be32_to_cpup(p++);
499         return p;
500 }
501 
502 /*
503  * sattr3
504  *
505  *      enum time_how {
506  *              DONT_CHANGE             = 0,
507  *              SET_TO_SERVER_TIME      = 1,
508  *              SET_TO_CLIENT_TIME      = 2
509  *      };
510  *
511  *      union set_mode3 switch (bool set_it) {
512  *      case TRUE:
513  *              mode3   mode;
514  *      default:
515  *              void;
516  *      };
517  *
518  *      union set_uid3 switch (bool set_it) {
519  *      case TRUE:
520  *              uid3    uid;
521  *      default:
522  *              void;
523  *      };
524  *
525  *      union set_gid3 switch (bool set_it) {
526  *      case TRUE:
527  *              gid3    gid;
528  *      default:
529  *              void;
530  *      };
531  *
532  *      union set_size3 switch (bool set_it) {
533  *      case TRUE:
534  *              size3   size;
535  *      default:
536  *              void;
537  *      };
538  *
539  *      union set_atime switch (time_how set_it) {
540  *      case SET_TO_CLIENT_TIME:
541  *              nfstime3        atime;
542  *      default:
543  *              void;
544  *      };
545  *
546  *      union set_mtime switch (time_how set_it) {
547  *      case SET_TO_CLIENT_TIME:
548  *              nfstime3  mtime;
549  *      default:
550  *              void;
551  *      };
552  *
553  *      struct sattr3 {
554  *              set_mode3       mode;
555  *              set_uid3        uid;
556  *              set_gid3        gid;
557  *              set_size3       size;
558  *              set_atime       atime;
559  *              set_mtime       mtime;
560  *      };
561  */
562 static void encode_sattr3(struct xdr_stream *xdr, const struct iattr *attr)
563 {
564         struct timespec ts;
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(from_kuid(&init_user_ns, 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(from_kgid(&init_user_ns, 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                 struct timespec ts;
615                 *p++ = xdr_two;
616                 ts = timespec64_to_timespec(attr->ia_atime);
617                 p = xdr_encode_nfstime3(p, &ts);
618         } else if (attr->ia_valid & ATTR_ATIME) {
619                 *p++ = xdr_one;
620         } else
621                 *p++ = xdr_zero;
622 
623         if (attr->ia_valid & ATTR_MTIME_SET) {
624                 *p++ = xdr_two;
625                 ts = timespec64_to_timespec(attr->ia_mtime);
626                 xdr_encode_nfstime3(p, &ts);
627         } else if (attr->ia_valid & ATTR_MTIME) {
628                 *p = xdr_one;
629         } else
630                 *p = xdr_zero;
631 }
632 
633 /*
634  * fattr3
635  *
636  *      struct fattr3 {
637  *              ftype3          type;
638  *              mode3           mode;
639  *              uint32          nlink;
640  *              uid3            uid;
641  *              gid3            gid;
642  *              size3           size;
643  *              size3           used;
644  *              specdata3       rdev;
645  *              uint64          fsid;
646  *              fileid3         fileid;
647  *              nfstime3        atime;
648  *              nfstime3        mtime;
649  *              nfstime3        ctime;
650  *      };
651  */
652 static int decode_fattr3(struct xdr_stream *xdr, struct nfs_fattr *fattr)
653 {
654         umode_t fmode;
655         __be32 *p;
656 
657         p = xdr_inline_decode(xdr, NFS3_fattr_sz << 2);
658         if (unlikely(p == NULL))
659                 goto out_overflow;
660 
661         p = xdr_decode_ftype3(p, &fmode);
662 
663         fattr->mode = (be32_to_cpup(p++) & ~S_IFMT) | fmode;
664         fattr->nlink = be32_to_cpup(p++);
665         fattr->uid = make_kuid(&init_user_ns, be32_to_cpup(p++));
666         if (!uid_valid(fattr->uid))
667                 goto out_uid;
668         fattr->gid = make_kgid(&init_user_ns, be32_to_cpup(p++));
669         if (!gid_valid(fattr->gid))
670                 goto out_gid;
671 
672         p = xdr_decode_size3(p, &fattr->size);
673         p = xdr_decode_size3(p, &fattr->du.nfs3.used);
674         p = xdr_decode_specdata3(p, &fattr->rdev);
675 
676         p = xdr_decode_hyper(p, &fattr->fsid.major);
677         fattr->fsid.minor = 0;
678 
679         p = xdr_decode_fileid3(p, &fattr->fileid);
680         p = xdr_decode_nfstime3(p, &fattr->atime);
681         p = xdr_decode_nfstime3(p, &fattr->mtime);
682         xdr_decode_nfstime3(p, &fattr->ctime);
683         fattr->change_attr = nfs_timespec_to_change_attr(&fattr->ctime);
684 
685         fattr->valid |= NFS_ATTR_FATTR_V3;
686         return 0;
687 out_uid:
688         dprintk("NFS: returned invalid uid\n");
689         return -EINVAL;
690 out_gid:
691         dprintk("NFS: returned invalid gid\n");
692         return -EINVAL;
693 out_overflow:
694         print_overflow_msg(__func__, xdr);
695         return -EIO;
696 }
697 
698 /*
699  * post_op_attr
700  *
701  *      union post_op_attr switch (bool attributes_follow) {
702  *      case TRUE:
703  *              fattr3  attributes;
704  *      case FALSE:
705  *              void;
706  *      };
707  */
708 static int decode_post_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
709 {
710         __be32 *p;
711 
712         p = xdr_inline_decode(xdr, 4);
713         if (unlikely(p == NULL))
714                 goto out_overflow;
715         if (*p != xdr_zero)
716                 return decode_fattr3(xdr, fattr);
717         return 0;
718 out_overflow:
719         print_overflow_msg(__func__, xdr);
720         return -EIO;
721 }
722 
723 /*
724  * wcc_attr
725  *      struct wcc_attr {
726  *              size3           size;
727  *              nfstime3        mtime;
728  *              nfstime3        ctime;
729  *      };
730  */
731 static int decode_wcc_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
732 {
733         __be32 *p;
734 
735         p = xdr_inline_decode(xdr, NFS3_wcc_attr_sz << 2);
736         if (unlikely(p == NULL))
737                 goto out_overflow;
738 
739         fattr->valid |= NFS_ATTR_FATTR_PRESIZE
740                 | NFS_ATTR_FATTR_PRECHANGE
741                 | NFS_ATTR_FATTR_PREMTIME
742                 | NFS_ATTR_FATTR_PRECTIME;
743 
744         p = xdr_decode_size3(p, &fattr->pre_size);
745         p = xdr_decode_nfstime3(p, &fattr->pre_mtime);
746         xdr_decode_nfstime3(p, &fattr->pre_ctime);
747         fattr->pre_change_attr = nfs_timespec_to_change_attr(&fattr->pre_ctime);
748 
749         return 0;
750 out_overflow:
751         print_overflow_msg(__func__, xdr);
752         return -EIO;
753 }
754 
755 /*
756  * pre_op_attr
757  *      union pre_op_attr switch (bool attributes_follow) {
758  *      case TRUE:
759  *              wcc_attr        attributes;
760  *      case FALSE:
761  *              void;
762  *      };
763  *
764  * wcc_data
765  *
766  *      struct wcc_data {
767  *              pre_op_attr     before;
768  *              post_op_attr    after;
769  *      };
770  */
771 static int decode_pre_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
772 {
773         __be32 *p;
774 
775         p = xdr_inline_decode(xdr, 4);
776         if (unlikely(p == NULL))
777                 goto out_overflow;
778         if (*p != xdr_zero)
779                 return decode_wcc_attr(xdr, fattr);
780         return 0;
781 out_overflow:
782         print_overflow_msg(__func__, xdr);
783         return -EIO;
784 }
785 
786 static int decode_wcc_data(struct xdr_stream *xdr, struct nfs_fattr *fattr)
787 {
788         int error;
789 
790         error = decode_pre_op_attr(xdr, fattr);
791         if (unlikely(error))
792                 goto out;
793         error = decode_post_op_attr(xdr, fattr);
794 out:
795         return error;
796 }
797 
798 /*
799  * post_op_fh3
800  *
801  *      union post_op_fh3 switch (bool handle_follows) {
802  *      case TRUE:
803  *              nfs_fh3  handle;
804  *      case FALSE:
805  *              void;
806  *      };
807  */
808 static int decode_post_op_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
809 {
810         __be32 *p = xdr_inline_decode(xdr, 4);
811         if (unlikely(p == NULL))
812                 goto out_overflow;
813         if (*p != xdr_zero)
814                 return decode_nfs_fh3(xdr, fh);
815         zero_nfs_fh3(fh);
816         return 0;
817 out_overflow:
818         print_overflow_msg(__func__, xdr);
819         return -EIO;
820 }
821 
822 /*
823  * diropargs3
824  *
825  *      struct diropargs3 {
826  *              nfs_fh3         dir;
827  *              filename3       name;
828  *      };
829  */
830 static void encode_diropargs3(struct xdr_stream *xdr, const struct nfs_fh *fh,
831                               const char *name, u32 length)
832 {
833         encode_nfs_fh3(xdr, fh);
834         encode_filename3(xdr, name, length);
835 }
836 
837 
838 /*
839  * NFSv3 XDR encode functions
840  *
841  * NFSv3 argument types are defined in section 3.3 of RFC 1813:
842  * "NFS Version 3 Protocol Specification".
843  */
844 
845 /*
846  * 3.3.1  GETATTR3args
847  *
848  *      struct GETATTR3args {
849  *              nfs_fh3  object;
850  *      };
851  */
852 static void nfs3_xdr_enc_getattr3args(struct rpc_rqst *req,
853                                       struct xdr_stream *xdr,
854                                       const void *data)
855 {
856         const struct nfs_fh *fh = data;
857 
858         encode_nfs_fh3(xdr, fh);
859 }
860 
861 /*
862  * 3.3.2  SETATTR3args
863  *
864  *      union sattrguard3 switch (bool check) {
865  *      case TRUE:
866  *              nfstime3  obj_ctime;
867  *      case FALSE:
868  *              void;
869  *      };
870  *
871  *      struct SETATTR3args {
872  *              nfs_fh3         object;
873  *              sattr3          new_attributes;
874  *              sattrguard3     guard;
875  *      };
876  */
877 static void encode_sattrguard3(struct xdr_stream *xdr,
878                                const struct nfs3_sattrargs *args)
879 {
880         __be32 *p;
881 
882         if (args->guard) {
883                 p = xdr_reserve_space(xdr, 4 + 8);
884                 *p++ = xdr_one;
885                 xdr_encode_nfstime3(p, &args->guardtime);
886         } else {
887                 p = xdr_reserve_space(xdr, 4);
888                 *p = xdr_zero;
889         }
890 }
891 
892 static void nfs3_xdr_enc_setattr3args(struct rpc_rqst *req,
893                                       struct xdr_stream *xdr,
894                                       const void *data)
895 {
896         const struct nfs3_sattrargs *args = data;
897         encode_nfs_fh3(xdr, args->fh);
898         encode_sattr3(xdr, args->sattr);
899         encode_sattrguard3(xdr, args);
900 }
901 
902 /*
903  * 3.3.3  LOOKUP3args
904  *
905  *      struct LOOKUP3args {
906  *              diropargs3  what;
907  *      };
908  */
909 static void nfs3_xdr_enc_lookup3args(struct rpc_rqst *req,
910                                      struct xdr_stream *xdr,
911                                      const void *data)
912 {
913         const struct nfs3_diropargs *args = data;
914 
915         encode_diropargs3(xdr, args->fh, args->name, args->len);
916 }
917 
918 /*
919  * 3.3.4  ACCESS3args
920  *
921  *      struct ACCESS3args {
922  *              nfs_fh3         object;
923  *              uint32          access;
924  *      };
925  */
926 static void encode_access3args(struct xdr_stream *xdr,
927                                const struct nfs3_accessargs *args)
928 {
929         encode_nfs_fh3(xdr, args->fh);
930         encode_uint32(xdr, args->access);
931 }
932 
933 static void nfs3_xdr_enc_access3args(struct rpc_rqst *req,
934                                      struct xdr_stream *xdr,
935                                      const void *data)
936 {
937         const struct nfs3_accessargs *args = data;
938 
939         encode_access3args(xdr, args);
940 }
941 
942 /*
943  * 3.3.5  READLINK3args
944  *
945  *      struct READLINK3args {
946  *              nfs_fh3 symlink;
947  *      };
948  */
949 static void nfs3_xdr_enc_readlink3args(struct rpc_rqst *req,
950                                        struct xdr_stream *xdr,
951                                        const void *data)
952 {
953         const struct nfs3_readlinkargs *args = data;
954 
955         encode_nfs_fh3(xdr, args->fh);
956         prepare_reply_buffer(req, args->pages, args->pgbase,
957                                         args->pglen, NFS3_readlinkres_sz);
958 }
959 
960 /*
961  * 3.3.6  READ3args
962  *
963  *      struct READ3args {
964  *              nfs_fh3         file;
965  *              offset3         offset;
966  *              count3          count;
967  *      };
968  */
969 static void encode_read3args(struct xdr_stream *xdr,
970                              const struct nfs_pgio_args *args)
971 {
972         __be32 *p;
973 
974         encode_nfs_fh3(xdr, args->fh);
975 
976         p = xdr_reserve_space(xdr, 8 + 4);
977         p = xdr_encode_hyper(p, args->offset);
978         *p = cpu_to_be32(args->count);
979 }
980 
981 static void nfs3_xdr_enc_read3args(struct rpc_rqst *req,
982                                    struct xdr_stream *xdr,
983                                    const void *data)
984 {
985         const struct nfs_pgio_args *args = data;
986         unsigned int replen = args->replen ? args->replen : NFS3_readres_sz;
987 
988         encode_read3args(xdr, args);
989         prepare_reply_buffer(req, args->pages, args->pgbase,
990                                         args->count, replen);
991         req->rq_rcv_buf.flags |= XDRBUF_READ;
992 }
993 
994 /*
995  * 3.3.7  WRITE3args
996  *
997  *      enum stable_how {
998  *              UNSTABLE  = 0,
999  *              DATA_SYNC = 1,
1000  *              FILE_SYNC = 2
1001  *      };
1002  *
1003  *      struct WRITE3args {
1004  *              nfs_fh3         file;
1005  *              offset3         offset;
1006  *              count3          count;
1007  *              stable_how      stable;
1008  *              opaque          data<>;
1009  *      };
1010  */
1011 static void encode_write3args(struct xdr_stream *xdr,
1012                               const struct nfs_pgio_args *args)
1013 {
1014         __be32 *p;
1015 
1016         encode_nfs_fh3(xdr, args->fh);
1017 
1018         p = xdr_reserve_space(xdr, 8 + 4 + 4 + 4);
1019         p = xdr_encode_hyper(p, args->offset);
1020         *p++ = cpu_to_be32(args->count);
1021         *p++ = cpu_to_be32(args->stable);
1022         *p = cpu_to_be32(args->count);
1023         xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
1024 }
1025 
1026 static void nfs3_xdr_enc_write3args(struct rpc_rqst *req,
1027                                     struct xdr_stream *xdr,
1028                                     const void *data)
1029 {
1030         const struct nfs_pgio_args *args = data;
1031 
1032         encode_write3args(xdr, args);
1033         xdr->buf->flags |= XDRBUF_WRITE;
1034 }
1035 
1036 /*
1037  * 3.3.8  CREATE3args
1038  *
1039  *      enum createmode3 {
1040  *              UNCHECKED = 0,
1041  *              GUARDED   = 1,
1042  *              EXCLUSIVE = 2
1043  *      };
1044  *
1045  *      union createhow3 switch (createmode3 mode) {
1046  *      case UNCHECKED:
1047  *      case GUARDED:
1048  *              sattr3       obj_attributes;
1049  *      case EXCLUSIVE:
1050  *              createverf3  verf;
1051  *      };
1052  *
1053  *      struct CREATE3args {
1054  *              diropargs3      where;
1055  *              createhow3      how;
1056  *      };
1057  */
1058 static void encode_createhow3(struct xdr_stream *xdr,
1059                               const struct nfs3_createargs *args)
1060 {
1061         encode_uint32(xdr, args->createmode);
1062         switch (args->createmode) {
1063         case NFS3_CREATE_UNCHECKED:
1064         case NFS3_CREATE_GUARDED:
1065                 encode_sattr3(xdr, args->sattr);
1066                 break;
1067         case NFS3_CREATE_EXCLUSIVE:
1068                 encode_createverf3(xdr, args->verifier);
1069                 break;
1070         default:
1071                 BUG();
1072         }
1073 }
1074 
1075 static void nfs3_xdr_enc_create3args(struct rpc_rqst *req,
1076                                      struct xdr_stream *xdr,
1077                                      const void *data)
1078 {
1079         const struct nfs3_createargs *args = data;
1080 
1081         encode_diropargs3(xdr, args->fh, args->name, args->len);
1082         encode_createhow3(xdr, args);
1083 }
1084 
1085 /*
1086  * 3.3.9  MKDIR3args
1087  *
1088  *      struct MKDIR3args {
1089  *              diropargs3      where;
1090  *              sattr3          attributes;
1091  *      };
1092  */
1093 static void nfs3_xdr_enc_mkdir3args(struct rpc_rqst *req,
1094                                     struct xdr_stream *xdr,
1095                                     const void *data)
1096 {
1097         const struct nfs3_mkdirargs *args = data;
1098 
1099         encode_diropargs3(xdr, args->fh, args->name, args->len);
1100         encode_sattr3(xdr, args->sattr);
1101 }
1102 
1103 /*
1104  * 3.3.10  SYMLINK3args
1105  *
1106  *      struct symlinkdata3 {
1107  *              sattr3          symlink_attributes;
1108  *              nfspath3        symlink_data;
1109  *      };
1110  *
1111  *      struct SYMLINK3args {
1112  *              diropargs3      where;
1113  *              symlinkdata3    symlink;
1114  *      };
1115  */
1116 static void encode_symlinkdata3(struct xdr_stream *xdr,
1117                                 const void *data)
1118 {
1119         const struct nfs3_symlinkargs *args = data;
1120 
1121         encode_sattr3(xdr, args->sattr);
1122         encode_nfspath3(xdr, args->pages, args->pathlen);
1123 }
1124 
1125 static void nfs3_xdr_enc_symlink3args(struct rpc_rqst *req,
1126                                       struct xdr_stream *xdr,
1127                                       const void *data)
1128 {
1129         const struct nfs3_symlinkargs *args = data;
1130 
1131         encode_diropargs3(xdr, args->fromfh, args->fromname, args->fromlen);
1132         encode_symlinkdata3(xdr, args);
1133         xdr->buf->flags |= XDRBUF_WRITE;
1134 }
1135 
1136 /*
1137  * 3.3.11  MKNOD3args
1138  *
1139  *      struct devicedata3 {
1140  *              sattr3          dev_attributes;
1141  *              specdata3       spec;
1142  *      };
1143  *
1144  *      union mknoddata3 switch (ftype3 type) {
1145  *      case NF3CHR:
1146  *      case NF3BLK:
1147  *              devicedata3     device;
1148  *      case NF3SOCK:
1149  *      case NF3FIFO:
1150  *              sattr3          pipe_attributes;
1151  *      default:
1152  *              void;
1153  *      };
1154  *
1155  *      struct MKNOD3args {
1156  *              diropargs3      where;
1157  *              mknoddata3      what;
1158  *      };
1159  */
1160 static void encode_devicedata3(struct xdr_stream *xdr,
1161                                const struct nfs3_mknodargs *args)
1162 {
1163         encode_sattr3(xdr, args->sattr);
1164         encode_specdata3(xdr, args->rdev);
1165 }
1166 
1167 static void encode_mknoddata3(struct xdr_stream *xdr,
1168                               const struct nfs3_mknodargs *args)
1169 {
1170         encode_ftype3(xdr, args->type);
1171         switch (args->type) {
1172         case NF3CHR:
1173         case NF3BLK:
1174                 encode_devicedata3(xdr, args);
1175                 break;
1176         case NF3SOCK:
1177         case NF3FIFO:
1178                 encode_sattr3(xdr, args->sattr);
1179                 break;
1180         case NF3REG:
1181         case NF3DIR:
1182                 break;
1183         default:
1184                 BUG();
1185         }
1186 }
1187 
1188 static void nfs3_xdr_enc_mknod3args(struct rpc_rqst *req,
1189                                     struct xdr_stream *xdr,
1190                                     const void *data)
1191 {
1192         const struct nfs3_mknodargs *args = data;
1193 
1194         encode_diropargs3(xdr, args->fh, args->name, args->len);
1195         encode_mknoddata3(xdr, args);
1196 }
1197 
1198 /*
1199  * 3.3.12  REMOVE3args
1200  *
1201  *      struct REMOVE3args {
1202  *              diropargs3  object;
1203  *      };
1204  */
1205 static void nfs3_xdr_enc_remove3args(struct rpc_rqst *req,
1206                                      struct xdr_stream *xdr,
1207                                      const void *data)
1208 {
1209         const struct nfs_removeargs *args = data;
1210 
1211         encode_diropargs3(xdr, args->fh, args->name.name, args->name.len);
1212 }
1213 
1214 /*
1215  * 3.3.14  RENAME3args
1216  *
1217  *      struct RENAME3args {
1218  *              diropargs3      from;
1219  *              diropargs3      to;
1220  *      };
1221  */
1222 static void nfs3_xdr_enc_rename3args(struct rpc_rqst *req,
1223                                      struct xdr_stream *xdr,
1224                                      const void *data)
1225 {
1226         const struct nfs_renameargs *args = data;
1227         const struct qstr *old = args->old_name;
1228         const struct qstr *new = args->new_name;
1229 
1230         encode_diropargs3(xdr, args->old_dir, old->name, old->len);
1231         encode_diropargs3(xdr, args->new_dir, new->name, new->len);
1232 }
1233 
1234 /*
1235  * 3.3.15  LINK3args
1236  *
1237  *      struct LINK3args {
1238  *              nfs_fh3         file;
1239  *              diropargs3      link;
1240  *      };
1241  */
1242 static void nfs3_xdr_enc_link3args(struct rpc_rqst *req,
1243                                    struct xdr_stream *xdr,
1244                                    const void *data)
1245 {
1246         const struct nfs3_linkargs *args = data;
1247 
1248         encode_nfs_fh3(xdr, args->fromfh);
1249         encode_diropargs3(xdr, args->tofh, args->toname, args->tolen);
1250 }
1251 
1252 /*
1253  * 3.3.16  READDIR3args
1254  *
1255  *      struct READDIR3args {
1256  *              nfs_fh3         dir;
1257  *              cookie3         cookie;
1258  *              cookieverf3     cookieverf;
1259  *              count3          count;
1260  *      };
1261  */
1262 static void encode_readdir3args(struct xdr_stream *xdr,
1263                                 const struct nfs3_readdirargs *args)
1264 {
1265         __be32 *p;
1266 
1267         encode_nfs_fh3(xdr, args->fh);
1268 
1269         p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4);
1270         p = xdr_encode_cookie3(p, args->cookie);
1271         p = xdr_encode_cookieverf3(p, args->verf);
1272         *p = cpu_to_be32(args->count);
1273 }
1274 
1275 static void nfs3_xdr_enc_readdir3args(struct rpc_rqst *req,
1276                                       struct xdr_stream *xdr,
1277                                       const void *data)
1278 {
1279         const struct nfs3_readdirargs *args = data;
1280 
1281         encode_readdir3args(xdr, args);
1282         prepare_reply_buffer(req, args->pages, 0,
1283                                 args->count, NFS3_readdirres_sz);
1284 }
1285 
1286 /*
1287  * 3.3.17  READDIRPLUS3args
1288  *
1289  *      struct READDIRPLUS3args {
1290  *              nfs_fh3         dir;
1291  *              cookie3         cookie;
1292  *              cookieverf3     cookieverf;
1293  *              count3          dircount;
1294  *              count3          maxcount;
1295  *      };
1296  */
1297 static void encode_readdirplus3args(struct xdr_stream *xdr,
1298                                     const struct nfs3_readdirargs *args)
1299 {
1300         __be32 *p;
1301 
1302         encode_nfs_fh3(xdr, args->fh);
1303 
1304         p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4 + 4);
1305         p = xdr_encode_cookie3(p, args->cookie);
1306         p = xdr_encode_cookieverf3(p, args->verf);
1307 
1308         /*
1309          * readdirplus: need dircount + buffer size.
1310          * We just make sure we make dircount big enough
1311          */
1312         *p++ = cpu_to_be32(args->count >> 3);
1313 
1314         *p = cpu_to_be32(args->count);
1315 }
1316 
1317 static void nfs3_xdr_enc_readdirplus3args(struct rpc_rqst *req,
1318                                           struct xdr_stream *xdr,
1319                                           const void *data)
1320 {
1321         const struct nfs3_readdirargs *args = data;
1322 
1323         encode_readdirplus3args(xdr, args);
1324         prepare_reply_buffer(req, args->pages, 0,
1325                                 args->count, NFS3_readdirres_sz);
1326 }
1327 
1328 /*
1329  * 3.3.21  COMMIT3args
1330  *
1331  *      struct COMMIT3args {
1332  *              nfs_fh3         file;
1333  *              offset3         offset;
1334  *              count3          count;
1335  *      };
1336  */
1337 static void encode_commit3args(struct xdr_stream *xdr,
1338                                const struct nfs_commitargs *args)
1339 {
1340         __be32 *p;
1341 
1342         encode_nfs_fh3(xdr, args->fh);
1343 
1344         p = xdr_reserve_space(xdr, 8 + 4);
1345         p = xdr_encode_hyper(p, args->offset);
1346         *p = cpu_to_be32(args->count);
1347 }
1348 
1349 static void nfs3_xdr_enc_commit3args(struct rpc_rqst *req,
1350                                      struct xdr_stream *xdr,
1351                                      const void *data)
1352 {
1353         const struct nfs_commitargs *args = data;
1354 
1355         encode_commit3args(xdr, args);
1356 }
1357 
1358 #ifdef CONFIG_NFS_V3_ACL
1359 
1360 static void nfs3_xdr_enc_getacl3args(struct rpc_rqst *req,
1361                                      struct xdr_stream *xdr,
1362                                      const void *data)
1363 {
1364         const struct nfs3_getaclargs *args = data;
1365 
1366         encode_nfs_fh3(xdr, args->fh);
1367         encode_uint32(xdr, args->mask);
1368         if (args->mask & (NFS_ACL | NFS_DFACL)) {
1369                 prepare_reply_buffer(req, args->pages, 0,
1370                                         NFSACL_MAXPAGES << PAGE_SHIFT,
1371                                         ACL3_getaclres_sz);
1372                 req->rq_rcv_buf.flags |= XDRBUF_SPARSE_PAGES;
1373         }
1374 }
1375 
1376 static void nfs3_xdr_enc_setacl3args(struct rpc_rqst *req,
1377                                      struct xdr_stream *xdr,
1378                                      const void *data)
1379 {
1380         const struct nfs3_setaclargs *args = data;
1381         unsigned int base;
1382         int error;
1383 
1384         encode_nfs_fh3(xdr, NFS_FH(args->inode));
1385         encode_uint32(xdr, args->mask);
1386 
1387         base = req->rq_slen;
1388         if (args->npages != 0)
1389                 xdr_write_pages(xdr, args->pages, 0, args->len);
1390         else
1391                 xdr_reserve_space(xdr, args->len);
1392 
1393         error = nfsacl_encode(xdr->buf, base, args->inode,
1394                             (args->mask & NFS_ACL) ?
1395                             args->acl_access : NULL, 1, 0);
1396         /* FIXME: this is just broken */
1397         BUG_ON(error < 0);
1398         error = nfsacl_encode(xdr->buf, base + error, args->inode,
1399                             (args->mask & NFS_DFACL) ?
1400                             args->acl_default : NULL, 1,
1401                             NFS_ACL_DEFAULT);
1402         BUG_ON(error < 0);
1403 }
1404 
1405 #endif  /* CONFIG_NFS_V3_ACL */
1406 
1407 /*
1408  * NFSv3 XDR decode functions
1409  *
1410  * NFSv3 result types are defined in section 3.3 of RFC 1813:
1411  * "NFS Version 3 Protocol Specification".
1412  */
1413 
1414 /*
1415  * 3.3.1  GETATTR3res
1416  *
1417  *      struct GETATTR3resok {
1418  *              fattr3          obj_attributes;
1419  *      };
1420  *
1421  *      union GETATTR3res switch (nfsstat3 status) {
1422  *      case NFS3_OK:
1423  *              GETATTR3resok  resok;
1424  *      default:
1425  *              void;
1426  *      };
1427  */
1428 static int nfs3_xdr_dec_getattr3res(struct rpc_rqst *req,
1429                                     struct xdr_stream *xdr,
1430                                     void *result)
1431 {
1432         enum nfs_stat status;
1433         int error;
1434 
1435         error = decode_nfsstat3(xdr, &status);
1436         if (unlikely(error))
1437                 goto out;
1438         if (status != NFS3_OK)
1439                 goto out_default;
1440         error = decode_fattr3(xdr, result);
1441 out:
1442         return error;
1443 out_default:
1444         return nfs3_stat_to_errno(status);
1445 }
1446 
1447 /*
1448  * 3.3.2  SETATTR3res
1449  *
1450  *      struct SETATTR3resok {
1451  *              wcc_data  obj_wcc;
1452  *      };
1453  *
1454  *      struct SETATTR3resfail {
1455  *              wcc_data  obj_wcc;
1456  *      };
1457  *
1458  *      union SETATTR3res switch (nfsstat3 status) {
1459  *      case NFS3_OK:
1460  *              SETATTR3resok   resok;
1461  *      default:
1462  *              SETATTR3resfail resfail;
1463  *      };
1464  */
1465 static int nfs3_xdr_dec_setattr3res(struct rpc_rqst *req,
1466                                     struct xdr_stream *xdr,
1467                                     void *result)
1468 {
1469         enum nfs_stat status;
1470         int error;
1471 
1472         error = decode_nfsstat3(xdr, &status);
1473         if (unlikely(error))
1474                 goto out;
1475         error = decode_wcc_data(xdr, result);
1476         if (unlikely(error))
1477                 goto out;
1478         if (status != NFS3_OK)
1479                 goto out_status;
1480 out:
1481         return error;
1482 out_status:
1483         return nfs3_stat_to_errno(status);
1484 }
1485 
1486 /*
1487  * 3.3.3  LOOKUP3res
1488  *
1489  *      struct LOOKUP3resok {
1490  *              nfs_fh3         object;
1491  *              post_op_attr    obj_attributes;
1492  *              post_op_attr    dir_attributes;
1493  *      };
1494  *
1495  *      struct LOOKUP3resfail {
1496  *              post_op_attr    dir_attributes;
1497  *      };
1498  *
1499  *      union LOOKUP3res switch (nfsstat3 status) {
1500  *      case NFS3_OK:
1501  *              LOOKUP3resok    resok;
1502  *      default:
1503  *              LOOKUP3resfail  resfail;
1504  *      };
1505  */
1506 static int nfs3_xdr_dec_lookup3res(struct rpc_rqst *req,
1507                                    struct xdr_stream *xdr,
1508                                    void *data)
1509 {
1510         struct nfs3_diropres *result = data;
1511         enum nfs_stat status;
1512         int error;
1513 
1514         error = decode_nfsstat3(xdr, &status);
1515         if (unlikely(error))
1516                 goto out;
1517         if (status != NFS3_OK)
1518                 goto out_default;
1519         error = decode_nfs_fh3(xdr, result->fh);
1520         if (unlikely(error))
1521                 goto out;
1522         error = decode_post_op_attr(xdr, result->fattr);
1523         if (unlikely(error))
1524                 goto out;
1525         error = decode_post_op_attr(xdr, result->dir_attr);
1526 out:
1527         return error;
1528 out_default:
1529         error = decode_post_op_attr(xdr, result->dir_attr);
1530         if (unlikely(error))
1531                 goto out;
1532         return nfs3_stat_to_errno(status);
1533 }
1534 
1535 /*
1536  * 3.3.4  ACCESS3res
1537  *
1538  *      struct ACCESS3resok {
1539  *              post_op_attr    obj_attributes;
1540  *              uint32          access;
1541  *      };
1542  *
1543  *      struct ACCESS3resfail {
1544  *              post_op_attr    obj_attributes;
1545  *      };
1546  *
1547  *      union ACCESS3res switch (nfsstat3 status) {
1548  *      case NFS3_OK:
1549  *              ACCESS3resok    resok;
1550  *      default:
1551  *              ACCESS3resfail  resfail;
1552  *      };
1553  */
1554 static int nfs3_xdr_dec_access3res(struct rpc_rqst *req,
1555                                    struct xdr_stream *xdr,
1556                                    void *data)
1557 {
1558         struct nfs3_accessres *result = data;
1559         enum nfs_stat status;
1560         int error;
1561 
1562         error = decode_nfsstat3(xdr, &status);
1563         if (unlikely(error))
1564                 goto out;
1565         error = decode_post_op_attr(xdr, result->fattr);
1566         if (unlikely(error))
1567                 goto out;
1568         if (status != NFS3_OK)
1569                 goto out_default;
1570         error = decode_uint32(xdr, &result->access);
1571 out:
1572         return error;
1573 out_default:
1574         return nfs3_stat_to_errno(status);
1575 }
1576 
1577 /*
1578  * 3.3.5  READLINK3res
1579  *
1580  *      struct READLINK3resok {
1581  *              post_op_attr    symlink_attributes;
1582  *              nfspath3        data;
1583  *      };
1584  *
1585  *      struct READLINK3resfail {
1586  *              post_op_attr    symlink_attributes;
1587  *      };
1588  *
1589  *      union READLINK3res switch (nfsstat3 status) {
1590  *      case NFS3_OK:
1591  *              READLINK3resok  resok;
1592  *      default:
1593  *              READLINK3resfail resfail;
1594  *      };
1595  */
1596 static int nfs3_xdr_dec_readlink3res(struct rpc_rqst *req,
1597                                      struct xdr_stream *xdr,
1598                                      void *result)
1599 {
1600         enum nfs_stat status;
1601         int error;
1602 
1603         error = decode_nfsstat3(xdr, &status);
1604         if (unlikely(error))
1605                 goto out;
1606         error = decode_post_op_attr(xdr, result);
1607         if (unlikely(error))
1608                 goto out;
1609         if (status != NFS3_OK)
1610                 goto out_default;
1611         error = decode_nfspath3(xdr);
1612 out:
1613         return error;
1614 out_default:
1615         return nfs3_stat_to_errno(status);
1616 }
1617 
1618 /*
1619  * 3.3.6  READ3res
1620  *
1621  *      struct READ3resok {
1622  *              post_op_attr    file_attributes;
1623  *              count3          count;
1624  *              bool            eof;
1625  *              opaque          data<>;
1626  *      };
1627  *
1628  *      struct READ3resfail {
1629  *              post_op_attr    file_attributes;
1630  *      };
1631  *
1632  *      union READ3res switch (nfsstat3 status) {
1633  *      case NFS3_OK:
1634  *              READ3resok      resok;
1635  *      default:
1636  *              READ3resfail    resfail;
1637  *      };
1638  */
1639 static int decode_read3resok(struct xdr_stream *xdr,
1640                              struct nfs_pgio_res *result)
1641 {
1642         u32 eof, count, ocount, recvd;
1643         __be32 *p;
1644 
1645         p = xdr_inline_decode(xdr, 4 + 4 + 4);
1646         if (unlikely(p == NULL))
1647                 goto out_overflow;
1648         count = be32_to_cpup(p++);
1649         eof = be32_to_cpup(p++);
1650         ocount = be32_to_cpup(p++);
1651         if (unlikely(ocount != count))
1652                 goto out_mismatch;
1653         recvd = xdr_read_pages(xdr, count);
1654         if (unlikely(count > recvd))
1655                 goto out_cheating;
1656 out:
1657         result->eof = eof;
1658         result->count = count;
1659         return count;
1660 out_mismatch:
1661         dprintk("NFS: READ count doesn't match length of opaque: "
1662                 "count %u != ocount %u\n", count, ocount);
1663         return -EIO;
1664 out_cheating:
1665         dprintk("NFS: server cheating in read result: "
1666                 "count %u > recvd %u\n", count, recvd);
1667         count = recvd;
1668         eof = 0;
1669         goto out;
1670 out_overflow:
1671         print_overflow_msg(__func__, xdr);
1672         return -EIO;
1673 }
1674 
1675 static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1676                                  void *data)
1677 {
1678         struct nfs_pgio_res *result = data;
1679         unsigned int pos;
1680         enum nfs_stat status;
1681         int error;
1682 
1683         pos = xdr_stream_pos(xdr);
1684         error = decode_nfsstat3(xdr, &status);
1685         if (unlikely(error))
1686                 goto out;
1687         error = decode_post_op_attr(xdr, result->fattr);
1688         if (unlikely(error))
1689                 goto out;
1690         result->op_status = status;
1691         if (status != NFS3_OK)
1692                 goto out_status;
1693         result->replen = 3 + ((xdr_stream_pos(xdr) - pos) >> 2);
1694         error = decode_read3resok(xdr, result);
1695 out:
1696         return error;
1697 out_status:
1698         return nfs3_stat_to_errno(status);
1699 }
1700 
1701 /*
1702  * 3.3.7  WRITE3res
1703  *
1704  *      enum stable_how {
1705  *              UNSTABLE  = 0,
1706  *              DATA_SYNC = 1,
1707  *              FILE_SYNC = 2
1708  *      };
1709  *
1710  *      struct WRITE3resok {
1711  *              wcc_data        file_wcc;
1712  *              count3          count;
1713  *              stable_how      committed;
1714  *              writeverf3      verf;
1715  *      };
1716  *
1717  *      struct WRITE3resfail {
1718  *              wcc_data        file_wcc;
1719  *      };
1720  *
1721  *      union WRITE3res switch (nfsstat3 status) {
1722  *      case NFS3_OK:
1723  *              WRITE3resok     resok;
1724  *      default:
1725  *              WRITE3resfail   resfail;
1726  *      };
1727  */
1728 static int decode_write3resok(struct xdr_stream *xdr,
1729                               struct nfs_pgio_res *result)
1730 {
1731         __be32 *p;
1732 
1733         p = xdr_inline_decode(xdr, 4 + 4);
1734         if (unlikely(p == NULL))
1735                 goto out_overflow;
1736         result->count = be32_to_cpup(p++);
1737         result->verf->committed = be32_to_cpup(p++);
1738         if (unlikely(result->verf->committed > NFS_FILE_SYNC))
1739                 goto out_badvalue;
1740         if (decode_writeverf3(xdr, &result->verf->verifier))
1741                 goto out_eio;
1742         return result->count;
1743 out_badvalue:
1744         dprintk("NFS: bad stable_how value: %u\n", result->verf->committed);
1745         return -EIO;
1746 out_overflow:
1747         print_overflow_msg(__func__, xdr);
1748 out_eio:
1749         return -EIO;
1750 }
1751 
1752 static int nfs3_xdr_dec_write3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1753                                   void *data)
1754 {
1755         struct nfs_pgio_res *result = data;
1756         enum nfs_stat status;
1757         int error;
1758 
1759         error = decode_nfsstat3(xdr, &status);
1760         if (unlikely(error))
1761                 goto out;
1762         error = decode_wcc_data(xdr, result->fattr);
1763         if (unlikely(error))
1764                 goto out;
1765         result->op_status = status;
1766         if (status != NFS3_OK)
1767                 goto out_status;
1768         error = decode_write3resok(xdr, result);
1769 out:
1770         return error;
1771 out_status:
1772         return nfs3_stat_to_errno(status);
1773 }
1774 
1775 /*
1776  * 3.3.8  CREATE3res
1777  *
1778  *      struct CREATE3resok {
1779  *              post_op_fh3     obj;
1780  *              post_op_attr    obj_attributes;
1781  *              wcc_data        dir_wcc;
1782  *      };
1783  *
1784  *      struct CREATE3resfail {
1785  *              wcc_data        dir_wcc;
1786  *      };
1787  *
1788  *      union CREATE3res switch (nfsstat3 status) {
1789  *      case NFS3_OK:
1790  *              CREATE3resok    resok;
1791  *      default:
1792  *              CREATE3resfail  resfail;
1793  *      };
1794  */
1795 static int decode_create3resok(struct xdr_stream *xdr,
1796                                struct nfs3_diropres *result)
1797 {
1798         int error;
1799 
1800         error = decode_post_op_fh3(xdr, result->fh);
1801         if (unlikely(error))
1802                 goto out;
1803         error = decode_post_op_attr(xdr, result->fattr);
1804         if (unlikely(error))
1805                 goto out;
1806         /* The server isn't required to return a file handle.
1807          * If it didn't, force the client to perform a LOOKUP
1808          * to determine the correct file handle and attribute
1809          * values for the new object. */
1810         if (result->fh->size == 0)
1811                 result->fattr->valid = 0;
1812         error = decode_wcc_data(xdr, result->dir_attr);
1813 out:
1814         return error;
1815 }
1816 
1817 static int nfs3_xdr_dec_create3res(struct rpc_rqst *req,
1818                                    struct xdr_stream *xdr,
1819                                    void *data)
1820 {
1821         struct nfs3_diropres *result = data;
1822         enum nfs_stat status;
1823         int error;
1824 
1825         error = decode_nfsstat3(xdr, &status);
1826         if (unlikely(error))
1827                 goto out;
1828         if (status != NFS3_OK)
1829                 goto out_default;
1830         error = decode_create3resok(xdr, result);
1831 out:
1832         return error;
1833 out_default:
1834         error = decode_wcc_data(xdr, result->dir_attr);
1835         if (unlikely(error))
1836                 goto out;
1837         return nfs3_stat_to_errno(status);
1838 }
1839 
1840 /*
1841  * 3.3.12  REMOVE3res
1842  *
1843  *      struct REMOVE3resok {
1844  *              wcc_data    dir_wcc;
1845  *      };
1846  *
1847  *      struct REMOVE3resfail {
1848  *              wcc_data    dir_wcc;
1849  *      };
1850  *
1851  *      union REMOVE3res switch (nfsstat3 status) {
1852  *      case NFS3_OK:
1853  *              REMOVE3resok   resok;
1854  *      default:
1855  *              REMOVE3resfail resfail;
1856  *      };
1857  */
1858 static int nfs3_xdr_dec_remove3res(struct rpc_rqst *req,
1859                                    struct xdr_stream *xdr,
1860                                    void *data)
1861 {
1862         struct nfs_removeres *result = data;
1863         enum nfs_stat status;
1864         int error;
1865 
1866         error = decode_nfsstat3(xdr, &status);
1867         if (unlikely(error))
1868                 goto out;
1869         error = decode_wcc_data(xdr, result->dir_attr);
1870         if (unlikely(error))
1871                 goto out;
1872         if (status != NFS3_OK)
1873                 goto out_status;
1874 out:
1875         return error;
1876 out_status:
1877         return nfs3_stat_to_errno(status);
1878 }
1879 
1880 /*
1881  * 3.3.14  RENAME3res
1882  *
1883  *      struct RENAME3resok {
1884  *              wcc_data        fromdir_wcc;
1885  *              wcc_data        todir_wcc;
1886  *      };
1887  *
1888  *      struct RENAME3resfail {
1889  *              wcc_data        fromdir_wcc;
1890  *              wcc_data        todir_wcc;
1891  *      };
1892  *
1893  *      union RENAME3res switch (nfsstat3 status) {
1894  *      case NFS3_OK:
1895  *              RENAME3resok   resok;
1896  *      default:
1897  *              RENAME3resfail resfail;
1898  *      };
1899  */
1900 static int nfs3_xdr_dec_rename3res(struct rpc_rqst *req,
1901                                    struct xdr_stream *xdr,
1902                                    void *data)
1903 {
1904         struct nfs_renameres *result = data;
1905         enum nfs_stat status;
1906         int error;
1907 
1908         error = decode_nfsstat3(xdr, &status);
1909         if (unlikely(error))
1910                 goto out;
1911         error = decode_wcc_data(xdr, result->old_fattr);
1912         if (unlikely(error))
1913                 goto out;
1914         error = decode_wcc_data(xdr, result->new_fattr);
1915         if (unlikely(error))
1916                 goto out;
1917         if (status != NFS3_OK)
1918                 goto out_status;
1919 out:
1920         return error;
1921 out_status:
1922         return nfs3_stat_to_errno(status);
1923 }
1924 
1925 /*
1926  * 3.3.15  LINK3res
1927  *
1928  *      struct LINK3resok {
1929  *              post_op_attr    file_attributes;
1930  *              wcc_data        linkdir_wcc;
1931  *      };
1932  *
1933  *      struct LINK3resfail {
1934  *              post_op_attr    file_attributes;
1935  *              wcc_data        linkdir_wcc;
1936  *      };
1937  *
1938  *      union LINK3res switch (nfsstat3 status) {
1939  *      case NFS3_OK:
1940  *              LINK3resok      resok;
1941  *      default:
1942  *              LINK3resfail    resfail;
1943  *      };
1944  */
1945 static int nfs3_xdr_dec_link3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1946                                  void *data)
1947 {
1948         struct nfs3_linkres *result = data;
1949         enum nfs_stat status;
1950         int error;
1951 
1952         error = decode_nfsstat3(xdr, &status);
1953         if (unlikely(error))
1954                 goto out;
1955         error = decode_post_op_attr(xdr, result->fattr);
1956         if (unlikely(error))
1957                 goto out;
1958         error = decode_wcc_data(xdr, result->dir_attr);
1959         if (unlikely(error))
1960                 goto out;
1961         if (status != NFS3_OK)
1962                 goto out_status;
1963 out:
1964         return error;
1965 out_status:
1966         return nfs3_stat_to_errno(status);
1967 }
1968 
1969 /**
1970  * nfs3_decode_dirent - Decode a single NFSv3 directory entry stored in
1971  *                      the local page cache
1972  * @xdr: XDR stream where entry resides
1973  * @entry: buffer to fill in with entry data
1974  * @plus: boolean indicating whether this should be a readdirplus entry
1975  *
1976  * Returns zero if successful, otherwise a negative errno value is
1977  * returned.
1978  *
1979  * This function is not invoked during READDIR reply decoding, but
1980  * rather whenever an application invokes the getdents(2) system call
1981  * on a directory already in our cache.
1982  *
1983  * 3.3.16  entry3
1984  *
1985  *      struct entry3 {
1986  *              fileid3         fileid;
1987  *              filename3       name;
1988  *              cookie3         cookie;
1989  *              fhandle3        filehandle;
1990  *              post_op_attr3   attributes;
1991  *              entry3          *nextentry;
1992  *      };
1993  *
1994  * 3.3.17  entryplus3
1995  *      struct entryplus3 {
1996  *              fileid3         fileid;
1997  *              filename3       name;
1998  *              cookie3         cookie;
1999  *              post_op_attr    name_attributes;
2000  *              post_op_fh3     name_handle;
2001  *              entryplus3      *nextentry;
2002  *      };
2003  */
2004 int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
2005                        bool plus)
2006 {
2007         struct nfs_entry old = *entry;
2008         __be32 *p;
2009         int error;
2010         u64 new_cookie;
2011 
2012         p = xdr_inline_decode(xdr, 4);
2013         if (unlikely(p == NULL))
2014                 goto out_overflow;
2015         if (*p == xdr_zero) {
2016                 p = xdr_inline_decode(xdr, 4);
2017                 if (unlikely(p == NULL))
2018                         goto out_overflow;
2019                 if (*p == xdr_zero)
2020                         return -EAGAIN;
2021                 entry->eof = 1;
2022                 return -EBADCOOKIE;
2023         }
2024 
2025         error = decode_fileid3(xdr, &entry->ino);
2026         if (unlikely(error))
2027                 return error;
2028 
2029         error = decode_inline_filename3(xdr, &entry->name, &entry->len);
2030         if (unlikely(error))
2031                 return error;
2032 
2033         error = decode_cookie3(xdr, &new_cookie);
2034         if (unlikely(error))
2035                 return error;
2036 
2037         entry->d_type = DT_UNKNOWN;
2038 
2039         if (plus) {
2040                 entry->fattr->valid = 0;
2041                 error = decode_post_op_attr(xdr, entry->fattr);
2042                 if (unlikely(error))
2043                         return error;
2044                 if (entry->fattr->valid & NFS_ATTR_FATTR_V3)
2045                         entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);
2046 
2047                 if (entry->fattr->fileid != entry->ino) {
2048                         entry->fattr->mounted_on_fileid = entry->ino;
2049                         entry->fattr->valid |= NFS_ATTR_FATTR_MOUNTED_ON_FILEID;
2050                 }
2051 
2052                 /* In fact, a post_op_fh3: */
2053                 p = xdr_inline_decode(xdr, 4);
2054                 if (unlikely(p == NULL))
2055                         goto out_overflow;
2056                 if (*p != xdr_zero) {
2057                         error = decode_nfs_fh3(xdr, entry->fh);
2058                         if (unlikely(error)) {
2059                                 if (error == -E2BIG)
2060                                         goto out_truncated;
2061                                 return error;
2062                         }
2063                 } else
2064                         zero_nfs_fh3(entry->fh);
2065         }
2066 
2067         entry->prev_cookie = entry->cookie;
2068         entry->cookie = new_cookie;
2069 
2070         return 0;
2071 
2072 out_overflow:
2073         print_overflow_msg(__func__, xdr);
2074         return -EAGAIN;
2075 out_truncated:
2076         dprintk("NFS: directory entry contains invalid file handle\n");
2077         *entry = old;
2078         return -EAGAIN;
2079 }
2080 
2081 /*
2082  * 3.3.16  READDIR3res
2083  *
2084  *      struct dirlist3 {
2085  *              entry3          *entries;
2086  *              bool            eof;
2087  *      };
2088  *
2089  *      struct READDIR3resok {
2090  *              post_op_attr    dir_attributes;
2091  *              cookieverf3     cookieverf;
2092  *              dirlist3        reply;
2093  *      };
2094  *
2095  *      struct READDIR3resfail {
2096  *              post_op_attr    dir_attributes;
2097  *      };
2098  *
2099  *      union READDIR3res switch (nfsstat3 status) {
2100  *      case NFS3_OK:
2101  *              READDIR3resok   resok;
2102  *      default:
2103  *              READDIR3resfail resfail;
2104  *      };
2105  *
2106  * Read the directory contents into the page cache, but otherwise
2107  * don't touch them.  The actual decoding is done by nfs3_decode_entry()
2108  * during subsequent nfs_readdir() calls.
2109  */
2110 static int decode_dirlist3(struct xdr_stream *xdr)
2111 {
2112         return xdr_read_pages(xdr, xdr->buf->page_len);
2113 }
2114 
2115 static int decode_readdir3resok(struct xdr_stream *xdr,
2116                                 struct nfs3_readdirres *result)
2117 {
2118         int error;
2119 
2120         error = decode_post_op_attr(xdr, result->dir_attr);
2121         if (unlikely(error))
2122                 goto out;
2123         /* XXX: do we need to check if result->verf != NULL ? */
2124         error = decode_cookieverf3(xdr, result->verf);
2125         if (unlikely(error))
2126                 goto out;
2127         error = decode_dirlist3(xdr);
2128 out:
2129         return error;
2130 }
2131 
2132 static int nfs3_xdr_dec_readdir3res(struct rpc_rqst *req,
2133                                     struct xdr_stream *xdr,
2134                                     void *data)
2135 {
2136         struct nfs3_readdirres *result = data;
2137         enum nfs_stat status;
2138         int error;
2139 
2140         error = decode_nfsstat3(xdr, &status);
2141         if (unlikely(error))
2142                 goto out;
2143         if (status != NFS3_OK)
2144                 goto out_default;
2145         error = decode_readdir3resok(xdr, result);
2146 out:
2147         return error;
2148 out_default:
2149         error = decode_post_op_attr(xdr, result->dir_attr);
2150         if (unlikely(error))
2151                 goto out;
2152         return nfs3_stat_to_errno(status);
2153 }
2154 
2155 /*
2156  * 3.3.18  FSSTAT3res
2157  *
2158  *      struct FSSTAT3resok {
2159  *              post_op_attr    obj_attributes;
2160  *              size3           tbytes;
2161  *              size3           fbytes;
2162  *              size3           abytes;
2163  *              size3           tfiles;
2164  *              size3           ffiles;
2165  *              size3           afiles;
2166  *              uint32          invarsec;
2167  *      };
2168  *
2169  *      struct FSSTAT3resfail {
2170  *              post_op_attr    obj_attributes;
2171  *      };
2172  *
2173  *      union FSSTAT3res switch (nfsstat3 status) {
2174  *      case NFS3_OK:
2175  *              FSSTAT3resok    resok;
2176  *      default:
2177  *              FSSTAT3resfail  resfail;
2178  *      };
2179  */
2180 static int decode_fsstat3resok(struct xdr_stream *xdr,
2181                                struct nfs_fsstat *result)
2182 {
2183         __be32 *p;
2184 
2185         p = xdr_inline_decode(xdr, 8 * 6 + 4);
2186         if (unlikely(p == NULL))
2187                 goto out_overflow;
2188         p = xdr_decode_size3(p, &result->tbytes);
2189         p = xdr_decode_size3(p, &result->fbytes);
2190         p = xdr_decode_size3(p, &result->abytes);
2191         p = xdr_decode_size3(p, &result->tfiles);
2192         p = xdr_decode_size3(p, &result->ffiles);
2193         xdr_decode_size3(p, &result->afiles);
2194         /* ignore invarsec */
2195         return 0;
2196 out_overflow:
2197         print_overflow_msg(__func__, xdr);
2198         return -EIO;
2199 }
2200 
2201 static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req,
2202                                    struct xdr_stream *xdr,
2203                                    void *data)
2204 {
2205         struct nfs_fsstat *result = data;
2206         enum nfs_stat status;
2207         int error;
2208 
2209         error = decode_nfsstat3(xdr, &status);
2210         if (unlikely(error))
2211                 goto out;
2212         error = decode_post_op_attr(xdr, result->fattr);
2213         if (unlikely(error))
2214                 goto out;
2215         if (status != NFS3_OK)
2216                 goto out_status;
2217         error = decode_fsstat3resok(xdr, result);
2218 out:
2219         return error;
2220 out_status:
2221         return nfs3_stat_to_errno(status);
2222 }
2223 
2224 /*
2225  * 3.3.19  FSINFO3res
2226  *
2227  *      struct FSINFO3resok {
2228  *              post_op_attr    obj_attributes;
2229  *              uint32          rtmax;
2230  *              uint32          rtpref;
2231  *              uint32          rtmult;
2232  *              uint32          wtmax;
2233  *              uint32          wtpref;
2234  *              uint32          wtmult;
2235  *              uint32          dtpref;
2236  *              size3           maxfilesize;
2237  *              nfstime3        time_delta;
2238  *              uint32          properties;
2239  *      };
2240  *
2241  *      struct FSINFO3resfail {
2242  *              post_op_attr    obj_attributes;
2243  *      };
2244  *
2245  *      union FSINFO3res switch (nfsstat3 status) {
2246  *      case NFS3_OK:
2247  *              FSINFO3resok    resok;
2248  *      default:
2249  *              FSINFO3resfail  resfail;
2250  *      };
2251  */
2252 static int decode_fsinfo3resok(struct xdr_stream *xdr,
2253                                struct nfs_fsinfo *result)
2254 {
2255         __be32 *p;
2256 
2257         p = xdr_inline_decode(xdr, 4 * 7 + 8 + 8 + 4);
2258         if (unlikely(p == NULL))
2259                 goto out_overflow;
2260         result->rtmax  = be32_to_cpup(p++);
2261         result->rtpref = be32_to_cpup(p++);
2262         result->rtmult = be32_to_cpup(p++);
2263         result->wtmax  = be32_to_cpup(p++);
2264         result->wtpref = be32_to_cpup(p++);
2265         result->wtmult = be32_to_cpup(p++);
2266         result->dtpref = be32_to_cpup(p++);
2267         p = xdr_decode_size3(p, &result->maxfilesize);
2268         xdr_decode_nfstime3(p, &result->time_delta);
2269 
2270         /* ignore properties */
2271         result->lease_time = 0;
2272         return 0;
2273 out_overflow:
2274         print_overflow_msg(__func__, xdr);
2275         return -EIO;
2276 }
2277 
2278 static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req,
2279                                    struct xdr_stream *xdr,
2280                                    void *data)
2281 {
2282         struct nfs_fsinfo *result = data;
2283         enum nfs_stat status;
2284         int error;
2285 
2286         error = decode_nfsstat3(xdr, &status);
2287         if (unlikely(error))
2288                 goto out;
2289         error = decode_post_op_attr(xdr, result->fattr);
2290         if (unlikely(error))
2291                 goto out;
2292         if (status != NFS3_OK)
2293                 goto out_status;
2294         error = decode_fsinfo3resok(xdr, result);
2295 out:
2296         return error;
2297 out_status:
2298         return nfs3_stat_to_errno(status);
2299 }
2300 
2301 /*
2302  * 3.3.20  PATHCONF3res
2303  *
2304  *      struct PATHCONF3resok {
2305  *              post_op_attr    obj_attributes;
2306  *              uint32          linkmax;
2307  *              uint32          name_max;
2308  *              bool            no_trunc;
2309  *              bool            chown_restricted;
2310  *              bool            case_insensitive;
2311  *              bool            case_preserving;
2312  *      };
2313  *
2314  *      struct PATHCONF3resfail {
2315  *              post_op_attr    obj_attributes;
2316  *      };
2317  *
2318  *      union PATHCONF3res switch (nfsstat3 status) {
2319  *      case NFS3_OK:
2320  *              PATHCONF3resok  resok;
2321  *      default:
2322  *              PATHCONF3resfail resfail;
2323  *      };
2324  */
2325 static int decode_pathconf3resok(struct xdr_stream *xdr,
2326                                  struct nfs_pathconf *result)
2327 {
2328         __be32 *p;
2329 
2330         p = xdr_inline_decode(xdr, 4 * 6);
2331         if (unlikely(p == NULL))
2332                 goto out_overflow;
2333         result->max_link = be32_to_cpup(p++);
2334         result->max_namelen = be32_to_cpup(p);
2335         /* ignore remaining fields */
2336         return 0;
2337 out_overflow:
2338         print_overflow_msg(__func__, xdr);
2339         return -EIO;
2340 }
2341 
2342 static int nfs3_xdr_dec_pathconf3res(struct rpc_rqst *req,
2343                                      struct xdr_stream *xdr,
2344                                      void *data)
2345 {
2346         struct nfs_pathconf *result = data;
2347         enum nfs_stat status;
2348         int error;
2349 
2350         error = decode_nfsstat3(xdr, &status);
2351         if (unlikely(error))
2352                 goto out;
2353         error = decode_post_op_attr(xdr, result->fattr);
2354         if (unlikely(error))
2355                 goto out;
2356         if (status != NFS3_OK)
2357                 goto out_status;
2358         error = decode_pathconf3resok(xdr, result);
2359 out:
2360         return error;
2361 out_status:
2362         return nfs3_stat_to_errno(status);
2363 }
2364 
2365 /*
2366  * 3.3.21  COMMIT3res
2367  *
2368  *      struct COMMIT3resok {
2369  *              wcc_data        file_wcc;
2370  *              writeverf3      verf;
2371  *      };
2372  *
2373  *      struct COMMIT3resfail {
2374  *              wcc_data        file_wcc;
2375  *      };
2376  *
2377  *      union COMMIT3res switch (nfsstat3 status) {
2378  *      case NFS3_OK:
2379  *              COMMIT3resok    resok;
2380  *      default:
2381  *              COMMIT3resfail  resfail;
2382  *      };
2383  */
2384 static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req,
2385                                    struct xdr_stream *xdr,
2386                                    void *data)
2387 {
2388         struct nfs_commitres *result = data;
2389         enum nfs_stat status;
2390         int error;
2391 
2392         error = decode_nfsstat3(xdr, &status);
2393         if (unlikely(error))
2394                 goto out;
2395         error = decode_wcc_data(xdr, result->fattr);
2396         if (unlikely(error))
2397                 goto out;
2398         result->op_status = status;
2399         if (status != NFS3_OK)
2400                 goto out_status;
2401         error = decode_writeverf3(xdr, &result->verf->verifier);
2402 out:
2403         return error;
2404 out_status:
2405         return nfs3_stat_to_errno(status);
2406 }
2407 
2408 #ifdef CONFIG_NFS_V3_ACL
2409 
2410 static inline int decode_getacl3resok(struct xdr_stream *xdr,
2411                                       struct nfs3_getaclres *result)
2412 {
2413         struct posix_acl **acl;
2414         unsigned int *aclcnt;
2415         size_t hdrlen;
2416         int error;
2417 
2418         error = decode_post_op_attr(xdr, result->fattr);
2419         if (unlikely(error))
2420                 goto out;
2421         error = decode_uint32(xdr, &result->mask);
2422         if (unlikely(error))
2423                 goto out;
2424         error = -EINVAL;
2425         if (result->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
2426                 goto out;
2427 
2428         hdrlen = xdr_stream_pos(xdr);
2429 
2430         acl = NULL;
2431         if (result->mask & NFS_ACL)
2432                 acl = &result->acl_access;
2433         aclcnt = NULL;
2434         if (result->mask & NFS_ACLCNT)
2435                 aclcnt = &result->acl_access_count;
2436         error = nfsacl_decode(xdr->buf, hdrlen, aclcnt, acl);
2437         if (unlikely(error <= 0))
2438                 goto out;
2439 
2440         acl = NULL;
2441         if (result->mask & NFS_DFACL)
2442                 acl = &result->acl_default;
2443         aclcnt = NULL;
2444         if (result->mask & NFS_DFACLCNT)
2445                 aclcnt = &result->acl_default_count;
2446         error = nfsacl_decode(xdr->buf, hdrlen + error, aclcnt, acl);
2447         if (unlikely(error <= 0))
2448                 return error;
2449         error = 0;
2450 out:
2451         return error;
2452 }
2453 
2454 static int nfs3_xdr_dec_getacl3res(struct rpc_rqst *req,
2455                                    struct xdr_stream *xdr,
2456                                    void *result)
2457 {
2458         enum nfs_stat status;
2459         int error;
2460 
2461         error = decode_nfsstat3(xdr, &status);
2462         if (unlikely(error))
2463                 goto out;
2464         if (status != NFS3_OK)
2465                 goto out_default;
2466         error = decode_getacl3resok(xdr, result);
2467 out:
2468         return error;
2469 out_default:
2470         return nfs3_stat_to_errno(status);
2471 }
2472 
2473 static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req,
2474                                    struct xdr_stream *xdr,
2475                                    void *result)
2476 {
2477         enum nfs_stat status;
2478         int error;
2479 
2480         error = decode_nfsstat3(xdr, &status);
2481         if (unlikely(error))
2482                 goto out;
2483         if (status != NFS3_OK)
2484                 goto out_default;
2485         error = decode_post_op_attr(xdr, result);
2486 out:
2487         return error;
2488 out_default:
2489         return nfs3_stat_to_errno(status);
2490 }
2491 
2492 #endif  /* CONFIG_NFS_V3_ACL */
2493 
2494 
2495 /*
2496  * We need to translate between nfs status return values and
2497  * the local errno values which may not be the same.
2498  */
2499 static const struct {
2500         int stat;
2501         int errno;
2502 } nfs_errtbl[] = {
2503         { NFS_OK,               0               },
2504         { NFSERR_PERM,          -EPERM          },
2505         { NFSERR_NOENT,         -ENOENT         },
2506         { NFSERR_IO,            -errno_NFSERR_IO},
2507         { NFSERR_NXIO,          -ENXIO          },
2508 /*      { NFSERR_EAGAIN,        -EAGAIN         }, */
2509         { NFSERR_ACCES,         -EACCES         },
2510         { NFSERR_EXIST,         -EEXIST         },
2511         { NFSERR_XDEV,          -EXDEV          },
2512         { NFSERR_NODEV,         -ENODEV         },
2513         { NFSERR_NOTDIR,        -ENOTDIR        },
2514         { NFSERR_ISDIR,         -EISDIR         },
2515         { NFSERR_INVAL,         -EINVAL         },
2516         { NFSERR_FBIG,          -EFBIG          },
2517         { NFSERR_NOSPC,         -ENOSPC         },
2518         { NFSERR_ROFS,          -EROFS          },
2519         { NFSERR_MLINK,         -EMLINK         },
2520         { NFSERR_NAMETOOLONG,   -ENAMETOOLONG   },
2521         { NFSERR_NOTEMPTY,      -ENOTEMPTY      },
2522         { NFSERR_DQUOT,         -EDQUOT         },
2523         { NFSERR_STALE,         -ESTALE         },
2524         { NFSERR_REMOTE,        -EREMOTE        },
2525 #ifdef EWFLUSH
2526         { NFSERR_WFLUSH,        -EWFLUSH        },
2527 #endif
2528         { NFSERR_BADHANDLE,     -EBADHANDLE     },
2529         { NFSERR_NOT_SYNC,      -ENOTSYNC       },
2530         { NFSERR_BAD_COOKIE,    -EBADCOOKIE     },
2531         { NFSERR_NOTSUPP,       -ENOTSUPP       },
2532         { NFSERR_TOOSMALL,      -ETOOSMALL      },
2533         { NFSERR_SERVERFAULT,   -EREMOTEIO      },
2534         { NFSERR_BADTYPE,       -EBADTYPE       },
2535         { NFSERR_JUKEBOX,       -EJUKEBOX       },
2536         { -1,                   -EIO            }
2537 };
2538 
2539 /**
2540  * nfs3_stat_to_errno - convert an NFS status code to a local errno
2541  * @status: NFS status code to convert
2542  *
2543  * Returns a local errno value, or -EIO if the NFS status code is
2544  * not recognized.  This function is used jointly by NFSv2 and NFSv3.
2545  */
2546 static int nfs3_stat_to_errno(enum nfs_stat status)
2547 {
2548         int i;
2549 
2550         for (i = 0; nfs_errtbl[i].stat != -1; i++) {
2551                 if (nfs_errtbl[i].stat == (int)status)
2552                         return nfs_errtbl[i].errno;
2553         }
2554         dprintk("NFS: Unrecognized nfs status value: %u\n", status);
2555         return nfs_errtbl[i].errno;
2556 }
2557 
2558 
2559 #define PROC(proc, argtype, restype, timer)                             \
2560 [NFS3PROC_##proc] = {                                                   \
2561         .p_proc      = NFS3PROC_##proc,                                 \
2562         .p_encode    = nfs3_xdr_enc_##argtype##3args,                   \
2563         .p_decode    = nfs3_xdr_dec_##restype##3res,                    \
2564         .p_arglen    = NFS3_##argtype##args_sz,                         \
2565         .p_replen    = NFS3_##restype##res_sz,                          \
2566         .p_timer     = timer,                                           \
2567         .p_statidx   = NFS3PROC_##proc,                                 \
2568         .p_name      = #proc,                                           \
2569         }
2570 
2571 const struct rpc_procinfo nfs3_procedures[] = {
2572         PROC(GETATTR,           getattr,        getattr,        1),
2573         PROC(SETATTR,           setattr,        setattr,        0),
2574         PROC(LOOKUP,            lookup,         lookup,         2),
2575         PROC(ACCESS,            access,         access,         1),
2576         PROC(READLINK,          readlink,       readlink,       3),
2577         PROC(READ,              read,           read,           3),
2578         PROC(WRITE,             write,          write,          4),
2579         PROC(CREATE,            create,         create,         0),
2580         PROC(MKDIR,             mkdir,          create,         0),
2581         PROC(SYMLINK,           symlink,        create,         0),
2582         PROC(MKNOD,             mknod,          create,         0),
2583         PROC(REMOVE,            remove,         remove,         0),
2584         PROC(RMDIR,             lookup,         setattr,        0),
2585         PROC(RENAME,            rename,         rename,         0),
2586         PROC(LINK,              link,           link,           0),
2587         PROC(READDIR,           readdir,        readdir,        3),
2588         PROC(READDIRPLUS,       readdirplus,    readdir,        3),
2589         PROC(FSSTAT,            getattr,        fsstat,         0),
2590         PROC(FSINFO,            getattr,        fsinfo,         0),
2591         PROC(PATHCONF,          getattr,        pathconf,       0),
2592         PROC(COMMIT,            commit,         commit,         5),
2593 };
2594 
2595 static unsigned int nfs_version3_counts[ARRAY_SIZE(nfs3_procedures)];
2596 const struct rpc_version nfs_version3 = {
2597         .number                 = 3,
2598         .nrprocs                = ARRAY_SIZE(nfs3_procedures),
2599         .procs                  = nfs3_procedures,
2600         .counts                 = nfs_version3_counts,
2601 };
2602 
2603 #ifdef CONFIG_NFS_V3_ACL
2604 static const struct rpc_procinfo nfs3_acl_procedures[] = {
2605         [ACLPROC3_GETACL] = {
2606                 .p_proc = ACLPROC3_GETACL,
2607                 .p_encode = nfs3_xdr_enc_getacl3args,
2608                 .p_decode = nfs3_xdr_dec_getacl3res,
2609                 .p_arglen = ACL3_getaclargs_sz,
2610                 .p_replen = ACL3_getaclres_sz,
2611                 .p_timer = 1,
2612                 .p_name = "GETACL",
2613         },
2614         [ACLPROC3_SETACL] = {
2615                 .p_proc = ACLPROC3_SETACL,
2616                 .p_encode = nfs3_xdr_enc_setacl3args,
2617                 .p_decode = nfs3_xdr_dec_setacl3res,
2618                 .p_arglen = ACL3_setaclargs_sz,
2619                 .p_replen = ACL3_setaclres_sz,
2620                 .p_timer = 0,
2621                 .p_name = "SETACL",
2622         },
2623 };
2624 
2625 static unsigned int nfs3_acl_counts[ARRAY_SIZE(nfs3_acl_procedures)];
2626 const struct rpc_version nfsacl_version3 = {
2627         .number                 = 3,
2628         .nrprocs                = ARRAY_SIZE(nfs3_acl_procedures),
2629         .procs                  = nfs3_acl_procedures,
2630         .counts                 = nfs3_acl_counts,
2631 };
2632 #endif  /* CONFIG_NFS_V3_ACL */
2633 

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