projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
[deliverable/linux.git] / fs / nfs / nfs3xdr.c
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/slab.h>
13 #include <linux/utsname.h>
14 #include <linux/errno.h>
15 #include <linux/string.h>
16 #include <linux/in.h>
17 #include <linux/pagemap.h>
18 #include <linux/proc_fs.h>
19 #include <linux/kdev_t.h>
20 #include <linux/sunrpc/clnt.h>
21 #include <linux/nfs.h>
22 #include <linux/nfs3.h>
23 #include <linux/nfs_fs.h>
24 #include <linux/nfsacl.h>
25 #include "internal.h"
26
27 #define NFSDBG_FACILITY NFSDBG_XDR
28
29 /* Mapping from NFS error code to "errno" error code. */
30 #define errno_NFSERR_IO EIO
31
32 /*
33 * Declare the space requirements for NFS arguments and replies as
34 * number of 32bit-words
35 */
36 #define NFS3_fhandle_sz (1+16)
37 #define NFS3_fh_sz (NFS3_fhandle_sz) /* shorthand */
38 #define NFS3_sattr_sz (15)
39 #define NFS3_filename_sz (1+(NFS3_MAXNAMLEN>>2))
40 #define NFS3_path_sz (1+(NFS3_MAXPATHLEN>>2))
41 #define NFS3_fattr_sz (21)
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_fsstat_sz
47 #define NFS3_fsinfo_sz
48 #define NFS3_pathconf_sz
49 #define NFS3_entry_sz (NFS3_filename_sz+3)
50
51 #define NFS3_sattrargs_sz (NFS3_fh_sz+NFS3_sattr_sz+3)
52 #define NFS3_diropargs_sz (NFS3_fh_sz+NFS3_filename_sz)
53 #define NFS3_removeargs_sz (NFS3_fh_sz+NFS3_filename_sz)
54 #define NFS3_accessargs_sz (NFS3_fh_sz+1)
55 #define NFS3_readlinkargs_sz (NFS3_fh_sz)
56 #define NFS3_readargs_sz (NFS3_fh_sz+3)
57 #define NFS3_writeargs_sz (NFS3_fh_sz+5)
58 #define NFS3_createargs_sz (NFS3_diropargs_sz+NFS3_sattr_sz)
59 #define NFS3_mkdirargs_sz (NFS3_diropargs_sz+NFS3_sattr_sz)
60 #define NFS3_symlinkargs_sz (NFS3_diropargs_sz+1+NFS3_sattr_sz)
61 #define NFS3_mknodargs_sz (NFS3_diropargs_sz+2+NFS3_sattr_sz)
62 #define NFS3_renameargs_sz (NFS3_diropargs_sz+NFS3_diropargs_sz)
63 #define NFS3_linkargs_sz (NFS3_fh_sz+NFS3_diropargs_sz)
64 #define NFS3_readdirargs_sz (NFS3_fh_sz+2)
65 #define NFS3_commitargs_sz (NFS3_fh_sz+3)
66
67 #define NFS3_attrstat_sz (1+NFS3_fattr_sz)
68 #define NFS3_wccstat_sz (1+NFS3_wcc_data_sz)
69 #define NFS3_removeres_sz (NFS3_wccstat_sz)
70 #define NFS3_lookupres_sz (1+NFS3_fh_sz+(2 * NFS3_post_op_attr_sz))
71 #define NFS3_accessres_sz (1+NFS3_post_op_attr_sz+1)
72 #define NFS3_readlinkres_sz (1+NFS3_post_op_attr_sz+1)
73 #define NFS3_readres_sz (1+NFS3_post_op_attr_sz+3)
74 #define NFS3_writeres_sz (1+NFS3_wcc_data_sz+4)
75 #define NFS3_createres_sz (1+NFS3_fh_sz+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
76 #define NFS3_renameres_sz (1+(2 * NFS3_wcc_data_sz))
77 #define NFS3_linkres_sz (1+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
78 #define NFS3_readdirres_sz (1+NFS3_post_op_attr_sz+2)
79 #define NFS3_fsstatres_sz (1+NFS3_post_op_attr_sz+13)
80 #define NFS3_fsinfores_sz (1+NFS3_post_op_attr_sz+12)
81 #define NFS3_pathconfres_sz (1+NFS3_post_op_attr_sz+6)
82 #define NFS3_commitres_sz (1+NFS3_wcc_data_sz+2)
83
84 #define ACL3_getaclargs_sz (NFS3_fh_sz+1)
85 #define ACL3_setaclargs_sz (NFS3_fh_sz+1+ \
86 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
87 #define ACL3_getaclres_sz (1+NFS3_post_op_attr_sz+1+ \
88 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
89 #define ACL3_setaclres_sz (1+NFS3_post_op_attr_sz)
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 * Common NFS XDR functions as inlines
107 */
108 static inline __be32 *
109 xdr_encode_fhandle(__be32 *p, const struct nfs_fh *fh)
110 {
111 return xdr_encode_array(p, fh->data, fh->size);
112 }
113
114 static inline __be32 *
115 xdr_decode_fhandle(__be32 *p, struct nfs_fh *fh)
116 {
117 if ((fh->size = ntohl(*p++)) <= NFS3_FHSIZE) {
118 memcpy(fh->data, p, fh->size);
119 return p + XDR_QUADLEN(fh->size);
120 }
121 return NULL;
122 }
123
124 /*
125 * Encode/decode time.
126 */
127 static inline __be32 *
128 xdr_encode_time3(__be32 *p, struct timespec *timep)
129 {
130 *p++ = htonl(timep->tv_sec);
131 *p++ = htonl(timep->tv_nsec);
132 return p;
133 }
134
135 static inline __be32 *
136 xdr_decode_time3(__be32 *p, struct timespec *timep)
137 {
138 timep->tv_sec = ntohl(*p++);
139 timep->tv_nsec = ntohl(*p++);
140 return p;
141 }
142
143 static __be32 *
144 xdr_decode_fattr(__be32 *p, struct nfs_fattr *fattr)
145 {
146 unsigned int type, major, minor;
147 umode_t fmode;
148
149 type = ntohl(*p++);
150 if (type > NF3FIFO)
151 type = NF3NON;
152 fmode = nfs_type2fmt[type];
153 fattr->mode = (ntohl(*p++) & ~S_IFMT) | fmode;
154 fattr->nlink = ntohl(*p++);
155 fattr->uid = ntohl(*p++);
156 fattr->gid = ntohl(*p++);
157 p = xdr_decode_hyper(p, &fattr->size);
158 p = xdr_decode_hyper(p, &fattr->du.nfs3.used);
159
160 /* Turn remote device info into Linux-specific dev_t */
161 major = ntohl(*p++);
162 minor = ntohl(*p++);
163 fattr->rdev = MKDEV(major, minor);
164 if (MAJOR(fattr->rdev) != major || MINOR(fattr->rdev) != minor)
165 fattr->rdev = 0;
166
167 p = xdr_decode_hyper(p, &fattr->fsid.major);
168 fattr->fsid.minor = 0;
169 p = xdr_decode_hyper(p, &fattr->fileid);
170 p = xdr_decode_time3(p, &fattr->atime);
171 p = xdr_decode_time3(p, &fattr->mtime);
172 p = xdr_decode_time3(p, &fattr->ctime);
173
174 /* Update the mode bits */
175 fattr->valid |= NFS_ATTR_FATTR_V3;
176 return p;
177 }
178
179 static inline __be32 *
180 xdr_encode_sattr(__be32 *p, struct iattr *attr)
181 {
182 if (attr->ia_valid & ATTR_MODE) {
183 *p++ = xdr_one;
184 *p++ = htonl(attr->ia_mode & S_IALLUGO);
185 } else {
186 *p++ = xdr_zero;
187 }
188 if (attr->ia_valid & ATTR_UID) {
189 *p++ = xdr_one;
190 *p++ = htonl(attr->ia_uid);
191 } else {
192 *p++ = xdr_zero;
193 }
194 if (attr->ia_valid & ATTR_GID) {
195 *p++ = xdr_one;
196 *p++ = htonl(attr->ia_gid);
197 } else {
198 *p++ = xdr_zero;
199 }
200 if (attr->ia_valid & ATTR_SIZE) {
201 *p++ = xdr_one;
202 p = xdr_encode_hyper(p, (__u64) attr->ia_size);
203 } else {
204 *p++ = xdr_zero;
205 }
206 if (attr->ia_valid & ATTR_ATIME_SET) {
207 *p++ = xdr_two;
208 p = xdr_encode_time3(p, &attr->ia_atime);
209 } else if (attr->ia_valid & ATTR_ATIME) {
210 *p++ = xdr_one;
211 } else {
212 *p++ = xdr_zero;
213 }
214 if (attr->ia_valid & ATTR_MTIME_SET) {
215 *p++ = xdr_two;
216 p = xdr_encode_time3(p, &attr->ia_mtime);
217 } else if (attr->ia_valid & ATTR_MTIME) {
218 *p++ = xdr_one;
219 } else {
220 *p++ = xdr_zero;
221 }
222 return p;
223 }
224
225 static inline __be32 *
226 xdr_decode_wcc_attr(__be32 *p, struct nfs_fattr *fattr)
227 {
228 p = xdr_decode_hyper(p, &fattr->pre_size);
229 p = xdr_decode_time3(p, &fattr->pre_mtime);
230 p = xdr_decode_time3(p, &fattr->pre_ctime);
231 fattr->valid |= NFS_ATTR_FATTR_PRESIZE
232 | NFS_ATTR_FATTR_PREMTIME
233 | NFS_ATTR_FATTR_PRECTIME;
234 return p;
235 }
236
237 static inline __be32 *
238 xdr_decode_post_op_attr(__be32 *p, struct nfs_fattr *fattr)
239 {
240 if (*p++)
241 p = xdr_decode_fattr(p, fattr);
242 return p;
243 }
244
245 static inline __be32 *
246 xdr_decode_pre_op_attr(__be32 *p, struct nfs_fattr *fattr)
247 {
248 if (*p++)
249 return xdr_decode_wcc_attr(p, fattr);
250 return p;
251 }
252
253
254 static inline __be32 *
255 xdr_decode_wcc_data(__be32 *p, struct nfs_fattr *fattr)
256 {
257 p = xdr_decode_pre_op_attr(p, fattr);
258 return xdr_decode_post_op_attr(p, fattr);
259 }
260
261 /*
262 * NFS encode functions
263 */
264
265 /*
266 * Encode file handle argument
267 */
268 static int
269 nfs3_xdr_fhandle(struct rpc_rqst *req, __be32 *p, struct nfs_fh *fh)
270 {
271 p = xdr_encode_fhandle(p, fh);
272 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
273 return 0;
274 }
275
276 /*
277 * Encode SETATTR arguments
278 */
279 static int
280 nfs3_xdr_sattrargs(struct rpc_rqst *req, __be32 *p, struct nfs3_sattrargs *args)
281 {
282 p = xdr_encode_fhandle(p, args->fh);
283 p = xdr_encode_sattr(p, args->sattr);
284 *p++ = htonl(args->guard);
285 if (args->guard)
286 p = xdr_encode_time3(p, &args->guardtime);
287 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
288 return 0;
289 }
290
291 /*
292 * Encode directory ops argument
293 */
294 static int
295 nfs3_xdr_diropargs(struct rpc_rqst *req, __be32 *p, struct nfs3_diropargs *args)
296 {
297 p = xdr_encode_fhandle(p, args->fh);
298 p = xdr_encode_array(p, args->name, args->len);
299 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
300 return 0;
301 }
302
303 /*
304 * Encode REMOVE argument
305 */
306 static int
307 nfs3_xdr_removeargs(struct rpc_rqst *req, __be32 *p, const struct nfs_removeargs *args)
308 {
309 p = xdr_encode_fhandle(p, args->fh);
310 p = xdr_encode_array(p, args->name.name, args->name.len);
311 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
312 return 0;
313 }
314
315 /*
316 * Encode access() argument
317 */
318 static int
319 nfs3_xdr_accessargs(struct rpc_rqst *req, __be32 *p, struct nfs3_accessargs *args)
320 {
321 p = xdr_encode_fhandle(p, args->fh);
322 *p++ = htonl(args->access);
323 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
324 return 0;
325 }
326
327 /*
328 * Arguments to a READ call. Since we read data directly into the page
329 * cache, we also set up the reply iovec here so that iov[1] points
330 * exactly to the page we want to fetch.
331 */
332 static int
333 nfs3_xdr_readargs(struct rpc_rqst *req, __be32 *p, struct nfs_readargs *args)
334 {
335 struct rpc_auth *auth = req->rq_task->tk_msg.rpc_cred->cr_auth;
336 unsigned int replen;
337 u32 count = args->count;
338
339 p = xdr_encode_fhandle(p, args->fh);
340 p = xdr_encode_hyper(p, args->offset);
341 *p++ = htonl(count);
342 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
343
344 /* Inline the page array */
345 replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS3_readres_sz) << 2;
346 xdr_inline_pages(&req->rq_rcv_buf, replen,
347 args->pages, args->pgbase, count);
348 req->rq_rcv_buf.flags |= XDRBUF_READ;
349 return 0;
350 }
351
352 /*
353 * Write arguments. Splice the buffer to be written into the iovec.
354 */
355 static int
356 nfs3_xdr_writeargs(struct rpc_rqst *req, __be32 *p, struct nfs_writeargs *args)
357 {
358 struct xdr_buf *sndbuf = &req->rq_snd_buf;
359 u32 count = args->count;
360
361 p = xdr_encode_fhandle(p, args->fh);
362 p = xdr_encode_hyper(p, args->offset);
363 *p++ = htonl(count);
364 *p++ = htonl(args->stable);
365 *p++ = htonl(count);
366 sndbuf->len = xdr_adjust_iovec(sndbuf->head, p);
367
368 /* Copy the page array */
369 xdr_encode_pages(sndbuf, args->pages, args->pgbase, count);
370 sndbuf->flags |= XDRBUF_WRITE;
371 return 0;
372 }
373
374 /*
375 * Encode CREATE arguments
376 */
377 static int
378 nfs3_xdr_createargs(struct rpc_rqst *req, __be32 *p, struct nfs3_createargs *args)
379 {
380 p = xdr_encode_fhandle(p, args->fh);
381 p = xdr_encode_array(p, args->name, args->len);
382
383 *p++ = htonl(args->createmode);
384 if (args->createmode == NFS3_CREATE_EXCLUSIVE) {
385 *p++ = args->verifier[0];
386 *p++ = args->verifier[1];
387 } else
388 p = xdr_encode_sattr(p, args->sattr);
389
390 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
391 return 0;
392 }
393
394 /*
395 * Encode MKDIR arguments
396 */
397 static int
398 nfs3_xdr_mkdirargs(struct rpc_rqst *req, __be32 *p, struct nfs3_mkdirargs *args)
399 {
400 p = xdr_encode_fhandle(p, args->fh);
401 p = xdr_encode_array(p, args->name, args->len);
402 p = xdr_encode_sattr(p, args->sattr);
403 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
404 return 0;
405 }
406
407 /*
408 * Encode SYMLINK arguments
409 */
410 static int
411 nfs3_xdr_symlinkargs(struct rpc_rqst *req, __be32 *p, struct nfs3_symlinkargs *args)
412 {
413 p = xdr_encode_fhandle(p, args->fromfh);
414 p = xdr_encode_array(p, args->fromname, args->fromlen);
415 p = xdr_encode_sattr(p, args->sattr);
416 *p++ = htonl(args->pathlen);
417 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
418
419 /* Copy the page */
420 xdr_encode_pages(&req->rq_snd_buf, args->pages, 0, args->pathlen);
421 return 0;
422 }
423
424 /*
425 * Encode MKNOD arguments
426 */
427 static int
428 nfs3_xdr_mknodargs(struct rpc_rqst *req, __be32 *p, struct nfs3_mknodargs *args)
429 {
430 p = xdr_encode_fhandle(p, args->fh);
431 p = xdr_encode_array(p, args->name, args->len);
432 *p++ = htonl(args->type);
433 p = xdr_encode_sattr(p, args->sattr);
434 if (args->type == NF3CHR || args->type == NF3BLK) {
435 *p++ = htonl(MAJOR(args->rdev));
436 *p++ = htonl(MINOR(args->rdev));
437 }
438
439 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
440 return 0;
441 }
442
443 /*
444 * Encode RENAME arguments
445 */
446 static int
447 nfs3_xdr_renameargs(struct rpc_rqst *req, __be32 *p, struct nfs3_renameargs *args)
448 {
449 p = xdr_encode_fhandle(p, args->fromfh);
450 p = xdr_encode_array(p, args->fromname, args->fromlen);
451 p = xdr_encode_fhandle(p, args->tofh);
452 p = xdr_encode_array(p, args->toname, args->tolen);
453 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
454 return 0;
455 }
456
457 /*
458 * Encode LINK arguments
459 */
460 static int
461 nfs3_xdr_linkargs(struct rpc_rqst *req, __be32 *p, struct nfs3_linkargs *args)
462 {
463 p = xdr_encode_fhandle(p, args->fromfh);
464 p = xdr_encode_fhandle(p, args->tofh);
465 p = xdr_encode_array(p, args->toname, args->tolen);
466 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
467 return 0;
468 }
469
470 /*
471 * Encode arguments to readdir call
472 */
473 static int
474 nfs3_xdr_readdirargs(struct rpc_rqst *req, __be32 *p, struct nfs3_readdirargs *args)
475 {
476 struct rpc_auth *auth = req->rq_task->tk_msg.rpc_cred->cr_auth;
477 unsigned int replen;
478 u32 count = args->count;
479
480 p = xdr_encode_fhandle(p, args->fh);
481 p = xdr_encode_hyper(p, args->cookie);
482 *p++ = args->verf[0];
483 *p++ = args->verf[1];
484 if (args->plus) {
485 /* readdirplus: need dircount + buffer size.
486 * We just make sure we make dircount big enough */
487 *p++ = htonl(count >> 3);
488 }
489 *p++ = htonl(count);
490 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
491
492 /* Inline the page array */
493 replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS3_readdirres_sz) << 2;
494 xdr_inline_pages(&req->rq_rcv_buf, replen, args->pages, 0, count);
495 return 0;
496 }
497
498 /*
499 * Decode the result of a readdir call.
500 * We just check for syntactical correctness.
501 */
502 static int
503 nfs3_xdr_readdirres(struct rpc_rqst *req, __be32 *p, struct nfs3_readdirres *res)
504 {
505 struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
506 struct kvec *iov = rcvbuf->head;
507 struct page **page;
508 size_t hdrlen;
509 u32 len, recvd, pglen;
510 int status, nr = 0;
511 __be32 *entry, *end, *kaddr;
512
513 status = ntohl(*p++);
514 /* Decode post_op_attrs */
515 p = xdr_decode_post_op_attr(p, res->dir_attr);
516 if (status)
517 return nfs_stat_to_errno(status);
518 /* Decode verifier cookie */
519 if (res->verf) {
520 res->verf[0] = *p++;
521 res->verf[1] = *p++;
522 } else {
523 p += 2;
524 }
525
526 hdrlen = (u8 *) p - (u8 *) iov->iov_base;
527 if (iov->iov_len < hdrlen) {
528 dprintk("NFS: READDIR reply header overflowed:"
529 "length %Zu > %Zu\n", hdrlen, iov->iov_len);
530 return -errno_NFSERR_IO;
531 } else if (iov->iov_len != hdrlen) {
532 dprintk("NFS: READDIR header is short. iovec will be shifted.\n");
533 xdr_shift_buf(rcvbuf, iov->iov_len - hdrlen);
534 }
535
536 pglen = rcvbuf->page_len;
537 recvd = rcvbuf->len - hdrlen;
538 if (pglen > recvd)
539 pglen = recvd;
540 page = rcvbuf->pages;
541 kaddr = p = kmap_atomic(*page, KM_USER0);
542 end = (__be32 *)((char *)p + pglen);
543 entry = p;
544
545 /* Make sure the packet actually has a value_follows and EOF entry */
546 if ((entry + 1) > end)
547 goto short_pkt;
548
549 for (; *p++; nr++) {
550 if (p + 3 > end)
551 goto short_pkt;
552 p += 2; /* inode # */
553 len = ntohl(*p++); /* string length */
554 p += XDR_QUADLEN(len) + 2; /* name + cookie */
555 if (len > NFS3_MAXNAMLEN) {
556 dprintk("NFS: giant filename in readdir (len 0x%x)!\n",
557 len);
558 goto err_unmap;
559 }
560
561 if (res->plus) {
562 /* post_op_attr */
563 if (p + 2 > end)
564 goto short_pkt;
565 if (*p++) {
566 p += 21;
567 if (p + 1 > end)
568 goto short_pkt;
569 }
570 /* post_op_fh3 */
571 if (*p++) {
572 if (p + 1 > end)
573 goto short_pkt;
574 len = ntohl(*p++);
575 if (len > NFS3_FHSIZE) {
576 dprintk("NFS: giant filehandle in "
577 "readdir (len 0x%x)!\n", len);
578 goto err_unmap;
579 }
580 p += XDR_QUADLEN(len);
581 }
582 }
583
584 if (p + 2 > end)
585 goto short_pkt;
586 entry = p;
587 }
588
589 /*
590 * Apparently some server sends responses that are a valid size, but
591 * contain no entries, and have value_follows==0 and EOF==0. For
592 * those, just set the EOF marker.
593 */
594 if (!nr && entry[1] == 0) {
595 dprintk("NFS: readdir reply truncated!\n");
596 entry[1] = 1;
597 }
598 out:
599 kunmap_atomic(kaddr, KM_USER0);
600 return nr;
601 short_pkt:
602 /*
603 * When we get a short packet there are 2 possibilities. We can
604 * return an error, or fix up the response to look like a valid
605 * response and return what we have so far. If there are no
606 * entries and the packet was short, then return -EIO. If there
607 * are valid entries in the response, return them and pretend that
608 * the call was successful, but incomplete. The caller can retry the
609 * readdir starting at the last cookie.
610 */
611 entry[0] = entry[1] = 0;
612 if (!nr)
613 nr = -errno_NFSERR_IO;
614 goto out;
615 err_unmap:
616 nr = -errno_NFSERR_IO;
617 goto out;
618 }
619
620 __be32 *
621 nfs3_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus)
622 {
623 struct nfs_entry old = *entry;
624
625 if (!*p++) {
626 if (!*p)
627 return ERR_PTR(-EAGAIN);
628 entry->eof = 1;
629 return ERR_PTR(-EBADCOOKIE);
630 }
631
632 p = xdr_decode_hyper(p, &entry->ino);
633 entry->len = ntohl(*p++);
634 entry->name = (const char *) p;
635 p += XDR_QUADLEN(entry->len);
636 entry->prev_cookie = entry->cookie;
637 p = xdr_decode_hyper(p, &entry->cookie);
638
639 if (plus) {
640 entry->fattr->valid = 0;
641 p = xdr_decode_post_op_attr(p, entry->fattr);
642 /* In fact, a post_op_fh3: */
643 if (*p++) {
644 p = xdr_decode_fhandle(p, entry->fh);
645 /* Ugh -- server reply was truncated */
646 if (p == NULL) {
647 dprintk("NFS: FH truncated\n");
648 *entry = old;
649 return ERR_PTR(-EAGAIN);
650 }
651 } else
652 memset((u8*)(entry->fh), 0, sizeof(*entry->fh));
653 }
654
655 entry->eof = !p[0] && p[1];
656 return p;
657 }
658
659 /*
660 * Encode COMMIT arguments
661 */
662 static int
663 nfs3_xdr_commitargs(struct rpc_rqst *req, __be32 *p, struct nfs_writeargs *args)
664 {
665 p = xdr_encode_fhandle(p, args->fh);
666 p = xdr_encode_hyper(p, args->offset);
667 *p++ = htonl(args->count);
668 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
669 return 0;
670 }
671
672 #ifdef CONFIG_NFS_V3_ACL
673 /*
674 * Encode GETACL arguments
675 */
676 static int
677 nfs3_xdr_getaclargs(struct rpc_rqst *req, __be32 *p,
678 struct nfs3_getaclargs *args)
679 {
680 struct rpc_auth *auth = req->rq_task->tk_msg.rpc_cred->cr_auth;
681 unsigned int replen;
682
683 p = xdr_encode_fhandle(p, args->fh);
684 *p++ = htonl(args->mask);
685 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
686
687 if (args->mask & (NFS_ACL | NFS_DFACL)) {
688 /* Inline the page array */
689 replen = (RPC_REPHDRSIZE + auth->au_rslack +
690 ACL3_getaclres_sz) << 2;
691 xdr_inline_pages(&req->rq_rcv_buf, replen, args->pages, 0,
692 NFSACL_MAXPAGES << PAGE_SHIFT);
693 }
694 return 0;
695 }
696
697 /*
698 * Encode SETACL arguments
699 */
700 static int
701 nfs3_xdr_setaclargs(struct rpc_rqst *req, __be32 *p,
702 struct nfs3_setaclargs *args)
703 {
704 struct xdr_buf *buf = &req->rq_snd_buf;
705 unsigned int base;
706 int err;
707
708 p = xdr_encode_fhandle(p, NFS_FH(args->inode));
709 *p++ = htonl(args->mask);
710 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
711 base = req->rq_slen;
712
713 if (args->npages != 0)
714 xdr_encode_pages(buf, args->pages, 0, args->len);
715 else
716 req->rq_slen += args->len;
717
718 err = nfsacl_encode(buf, base, args->inode,
719 (args->mask & NFS_ACL) ?
720 args->acl_access : NULL, 1, 0);
721 if (err > 0)
722 err = nfsacl_encode(buf, base + err, args->inode,
723 (args->mask & NFS_DFACL) ?
724 args->acl_default : NULL, 1,
725 NFS_ACL_DEFAULT);
726 return (err > 0) ? 0 : err;
727 }
728 #endif /* CONFIG_NFS_V3_ACL */
729
730 /*
731 * NFS XDR decode functions
732 */
733
734 /*
735 * Decode attrstat reply.
736 */
737 static int
738 nfs3_xdr_attrstat(struct rpc_rqst *req, __be32 *p, struct nfs_fattr *fattr)
739 {
740 int status;
741
742 if ((status = ntohl(*p++)))
743 return nfs_stat_to_errno(status);
744 xdr_decode_fattr(p, fattr);
745 return 0;
746 }
747
748 /*
749 * Decode status+wcc_data reply
750 * SATTR, REMOVE, RMDIR
751 */
752 static int
753 nfs3_xdr_wccstat(struct rpc_rqst *req, __be32 *p, struct nfs_fattr *fattr)
754 {
755 int status;
756
757 if ((status = ntohl(*p++)))
758 status = nfs_stat_to_errno(status);
759 xdr_decode_wcc_data(p, fattr);
760 return status;
761 }
762
763 static int
764 nfs3_xdr_removeres(struct rpc_rqst *req, __be32 *p, struct nfs_removeres *res)
765 {
766 return nfs3_xdr_wccstat(req, p, &res->dir_attr);
767 }
768
769 /*
770 * Decode LOOKUP reply
771 */
772 static int
773 nfs3_xdr_lookupres(struct rpc_rqst *req, __be32 *p, struct nfs3_diropres *res)
774 {
775 int status;
776
777 if ((status = ntohl(*p++))) {
778 status = nfs_stat_to_errno(status);
779 } else {
780 if (!(p = xdr_decode_fhandle(p, res->fh)))
781 return -errno_NFSERR_IO;
782 p = xdr_decode_post_op_attr(p, res->fattr);
783 }
784 xdr_decode_post_op_attr(p, res->dir_attr);
785 return status;
786 }
787
788 /*
789 * Decode ACCESS reply
790 */
791 static int
792 nfs3_xdr_accessres(struct rpc_rqst *req, __be32 *p, struct nfs3_accessres *res)
793 {
794 int status = ntohl(*p++);
795
796 p = xdr_decode_post_op_attr(p, res->fattr);
797 if (status)
798 return nfs_stat_to_errno(status);
799 res->access = ntohl(*p++);
800 return 0;
801 }
802
803 static int
804 nfs3_xdr_readlinkargs(struct rpc_rqst *req, __be32 *p, struct nfs3_readlinkargs *args)
805 {
806 struct rpc_auth *auth = req->rq_task->tk_msg.rpc_cred->cr_auth;
807 unsigned int replen;
808
809 p = xdr_encode_fhandle(p, args->fh);
810 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
811
812 /* Inline the page array */
813 replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS3_readlinkres_sz) << 2;
814 xdr_inline_pages(&req->rq_rcv_buf, replen, args->pages, args->pgbase, args->pglen);
815 return 0;
816 }
817
818 /*
819 * Decode READLINK reply
820 */
821 static int
822 nfs3_xdr_readlinkres(struct rpc_rqst *req, __be32 *p, struct nfs_fattr *fattr)
823 {
824 struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
825 struct kvec *iov = rcvbuf->head;
826 size_t hdrlen;
827 u32 len, recvd;
828 char *kaddr;
829 int status;
830
831 status = ntohl(*p++);
832 p = xdr_decode_post_op_attr(p, fattr);
833
834 if (status != 0)
835 return nfs_stat_to_errno(status);
836
837 /* Convert length of symlink */
838 len = ntohl(*p++);
839 if (len >= rcvbuf->page_len) {
840 dprintk("nfs: server returned giant symlink!\n");
841 return -ENAMETOOLONG;
842 }
843
844 hdrlen = (u8 *) p - (u8 *) iov->iov_base;
845 if (iov->iov_len < hdrlen) {
846 dprintk("NFS: READLINK reply header overflowed:"
847 "length %Zu > %Zu\n", hdrlen, iov->iov_len);
848 return -errno_NFSERR_IO;
849 } else if (iov->iov_len != hdrlen) {
850 dprintk("NFS: READLINK header is short. "
851 "iovec will be shifted.\n");
852 xdr_shift_buf(rcvbuf, iov->iov_len - hdrlen);
853 }
854 recvd = req->rq_rcv_buf.len - hdrlen;
855 if (recvd < len) {
856 dprintk("NFS: server cheating in readlink reply: "
857 "count %u > recvd %u\n", len, recvd);
858 return -EIO;
859 }
860
861 /* NULL terminate the string we got */
862 kaddr = (char*)kmap_atomic(rcvbuf->pages[0], KM_USER0);
863 kaddr[len+rcvbuf->page_base] = '\0';
864 kunmap_atomic(kaddr, KM_USER0);
865 return 0;
866 }
867
868 /*
869 * Decode READ reply
870 */
871 static int
872 nfs3_xdr_readres(struct rpc_rqst *req, __be32 *p, struct nfs_readres *res)
873 {
874 struct kvec *iov = req->rq_rcv_buf.head;
875 size_t hdrlen;
876 u32 count, ocount, recvd;
877 int status;
878
879 status = ntohl(*p++);
880 p = xdr_decode_post_op_attr(p, res->fattr);
881
882 if (status != 0)
883 return nfs_stat_to_errno(status);
884
885 /* Decode reply count and EOF flag. NFSv3 is somewhat redundant
886 * in that it puts the count both in the res struct and in the
887 * opaque data count. */
888 count = ntohl(*p++);
889 res->eof = ntohl(*p++);
890 ocount = ntohl(*p++);
891
892 if (ocount != count) {
893 dprintk("NFS: READ count doesn't match RPC opaque count.\n");
894 return -errno_NFSERR_IO;
895 }
896
897 hdrlen = (u8 *) p - (u8 *) iov->iov_base;
898 if (iov->iov_len < hdrlen) {
899 dprintk("NFS: READ reply header overflowed:"
900 "length %Zu > %Zu\n", hdrlen, iov->iov_len);
901 return -errno_NFSERR_IO;
902 } else if (iov->iov_len != hdrlen) {
903 dprintk("NFS: READ header is short. iovec will be shifted.\n");
904 xdr_shift_buf(&req->rq_rcv_buf, iov->iov_len - hdrlen);
905 }
906
907 recvd = req->rq_rcv_buf.len - hdrlen;
908 if (count > recvd) {
909 dprintk("NFS: server cheating in read reply: "
910 "count %u > recvd %u\n", count, recvd);
911 count = recvd;
912 res->eof = 0;
913 }
914
915 if (count < res->count)
916 res->count = count;
917
918 return count;
919 }
920
921 /*
922 * Decode WRITE response
923 */
924 static int
925 nfs3_xdr_writeres(struct rpc_rqst *req, __be32 *p, struct nfs_writeres *res)
926 {
927 int status;
928
929 status = ntohl(*p++);
930 p = xdr_decode_wcc_data(p, res->fattr);
931
932 if (status != 0)
933 return nfs_stat_to_errno(status);
934
935 res->count = ntohl(*p++);
936 res->verf->committed = (enum nfs3_stable_how)ntohl(*p++);
937 res->verf->verifier[0] = *p++;
938 res->verf->verifier[1] = *p++;
939
940 return res->count;
941 }
942
943 /*
944 * Decode a CREATE response
945 */
946 static int
947 nfs3_xdr_createres(struct rpc_rqst *req, __be32 *p, struct nfs3_diropres *res)
948 {
949 int status;
950
951 status = ntohl(*p++);
952 if (status == 0) {
953 if (*p++) {
954 if (!(p = xdr_decode_fhandle(p, res->fh)))
955 return -errno_NFSERR_IO;
956 p = xdr_decode_post_op_attr(p, res->fattr);
957 } else {
958 memset(res->fh, 0, sizeof(*res->fh));
959 /* Do decode post_op_attr but set it to NULL */
960 p = xdr_decode_post_op_attr(p, res->fattr);
961 res->fattr->valid = 0;
962 }
963 } else {
964 status = nfs_stat_to_errno(status);
965 }
966 p = xdr_decode_wcc_data(p, res->dir_attr);
967 return status;
968 }
969
970 /*
971 * Decode RENAME reply
972 */
973 static int
974 nfs3_xdr_renameres(struct rpc_rqst *req, __be32 *p, struct nfs3_renameres *res)
975 {
976 int status;
977
978 if ((status = ntohl(*p++)) != 0)
979 status = nfs_stat_to_errno(status);
980 p = xdr_decode_wcc_data(p, res->fromattr);
981 p = xdr_decode_wcc_data(p, res->toattr);
982 return status;
983 }
984
985 /*
986 * Decode LINK reply
987 */
988 static int
989 nfs3_xdr_linkres(struct rpc_rqst *req, __be32 *p, struct nfs3_linkres *res)
990 {
991 int status;
992
993 if ((status = ntohl(*p++)) != 0)
994 status = nfs_stat_to_errno(status);
995 p = xdr_decode_post_op_attr(p, res->fattr);
996 p = xdr_decode_wcc_data(p, res->dir_attr);
997 return status;
998 }
999
1000 /*
1001 * Decode FSSTAT reply
1002 */
1003 static int
1004 nfs3_xdr_fsstatres(struct rpc_rqst *req, __be32 *p, struct nfs_fsstat *res)
1005 {
1006 int status;
1007
1008 status = ntohl(*p++);
1009
1010 p = xdr_decode_post_op_attr(p, res->fattr);
1011 if (status != 0)
1012 return nfs_stat_to_errno(status);
1013
1014 p = xdr_decode_hyper(p, &res->tbytes);
1015 p = xdr_decode_hyper(p, &res->fbytes);
1016 p = xdr_decode_hyper(p, &res->abytes);
1017 p = xdr_decode_hyper(p, &res->tfiles);
1018 p = xdr_decode_hyper(p, &res->ffiles);
1019 p = xdr_decode_hyper(p, &res->afiles);
1020
1021 /* ignore invarsec */
1022 return 0;
1023 }
1024
1025 /*
1026 * Decode FSINFO reply
1027 */
1028 static int
1029 nfs3_xdr_fsinfores(struct rpc_rqst *req, __be32 *p, struct nfs_fsinfo *res)
1030 {
1031 int status;
1032
1033 status = ntohl(*p++);
1034
1035 p = xdr_decode_post_op_attr(p, res->fattr);
1036 if (status != 0)
1037 return nfs_stat_to_errno(status);
1038
1039 res->rtmax = ntohl(*p++);
1040 res->rtpref = ntohl(*p++);
1041 res->rtmult = ntohl(*p++);
1042 res->wtmax = ntohl(*p++);
1043 res->wtpref = ntohl(*p++);
1044 res->wtmult = ntohl(*p++);
1045 res->dtpref = ntohl(*p++);
1046 p = xdr_decode_hyper(p, &res->maxfilesize);
1047
1048 /* ignore time_delta and properties */
1049 res->lease_time = 0;
1050 return 0;
1051 }
1052
1053 /*
1054 * Decode PATHCONF reply
1055 */
1056 static int
1057 nfs3_xdr_pathconfres(struct rpc_rqst *req, __be32 *p, struct nfs_pathconf *res)
1058 {
1059 int status;
1060
1061 status = ntohl(*p++);
1062
1063 p = xdr_decode_post_op_attr(p, res->fattr);
1064 if (status != 0)
1065 return nfs_stat_to_errno(status);
1066 res->max_link = ntohl(*p++);
1067 res->max_namelen = ntohl(*p++);
1068
1069 /* ignore remaining fields */
1070 return 0;
1071 }
1072
1073 /*
1074 * Decode COMMIT reply
1075 */
1076 static int
1077 nfs3_xdr_commitres(struct rpc_rqst *req, __be32 *p, struct nfs_writeres *res)
1078 {
1079 int status;
1080
1081 status = ntohl(*p++);
1082 p = xdr_decode_wcc_data(p, res->fattr);
1083 if (status != 0)
1084 return nfs_stat_to_errno(status);
1085
1086 res->verf->verifier[0] = *p++;
1087 res->verf->verifier[1] = *p++;
1088 return 0;
1089 }
1090
1091 #ifdef CONFIG_NFS_V3_ACL
1092 /*
1093 * Decode GETACL reply
1094 */
1095 static int
1096 nfs3_xdr_getaclres(struct rpc_rqst *req, __be32 *p,
1097 struct nfs3_getaclres *res)
1098 {
1099 struct xdr_buf *buf = &req->rq_rcv_buf;
1100 int status = ntohl(*p++);
1101 struct posix_acl **acl;
1102 unsigned int *aclcnt;
1103 int err, base;
1104
1105 if (status != 0)
1106 return nfs_stat_to_errno(status);
1107 p = xdr_decode_post_op_attr(p, res->fattr);
1108 res->mask = ntohl(*p++);
1109 if (res->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
1110 return -EINVAL;
1111 base = (char *)p - (char *)req->rq_rcv_buf.head->iov_base;
1112
1113 acl = (res->mask & NFS_ACL) ? &res->acl_access : NULL;
1114 aclcnt = (res->mask & NFS_ACLCNT) ? &res->acl_access_count : NULL;
1115 err = nfsacl_decode(buf, base, aclcnt, acl);
1116
1117 acl = (res->mask & NFS_DFACL) ? &res->acl_default : NULL;
1118 aclcnt = (res->mask & NFS_DFACLCNT) ? &res->acl_default_count : NULL;
1119 if (err > 0)
1120 err = nfsacl_decode(buf, base + err, aclcnt, acl);
1121 return (err > 0) ? 0 : err;
1122 }
1123
1124 /*
1125 * Decode setacl reply.
1126 */
1127 static int
1128 nfs3_xdr_setaclres(struct rpc_rqst *req, __be32 *p, struct nfs_fattr *fattr)
1129 {
1130 int status = ntohl(*p++);
1131
1132 if (status)
1133 return nfs_stat_to_errno(status);
1134 xdr_decode_post_op_attr(p, fattr);
1135 return 0;
1136 }
1137 #endif /* CONFIG_NFS_V3_ACL */
1138
1139 #define PROC(proc, argtype, restype, timer) \
1140 [NFS3PROC_##proc] = { \
1141 .p_proc = NFS3PROC_##proc, \
1142 .p_encode = (kxdrproc_t) nfs3_xdr_##argtype, \
1143 .p_decode = (kxdrproc_t) nfs3_xdr_##restype, \
1144 .p_arglen = NFS3_##argtype##_sz, \
1145 .p_replen = NFS3_##restype##_sz, \
1146 .p_timer = timer, \
1147 .p_statidx = NFS3PROC_##proc, \
1148 .p_name = #proc, \
1149 }
1150
1151 struct rpc_procinfo nfs3_procedures[] = {
1152 PROC(GETATTR, fhandle, attrstat, 1),
1153 PROC(SETATTR, sattrargs, wccstat, 0),
1154 PROC(LOOKUP, diropargs, lookupres, 2),
1155 PROC(ACCESS, accessargs, accessres, 1),
1156 PROC(READLINK, readlinkargs, readlinkres, 3),
1157 PROC(READ, readargs, readres, 3),
1158 PROC(WRITE, writeargs, writeres, 4),
1159 PROC(CREATE, createargs, createres, 0),
1160 PROC(MKDIR, mkdirargs, createres, 0),
1161 PROC(SYMLINK, symlinkargs, createres, 0),
1162 PROC(MKNOD, mknodargs, createres, 0),
1163 PROC(REMOVE, removeargs, removeres, 0),
1164 PROC(RMDIR, diropargs, wccstat, 0),
1165 PROC(RENAME, renameargs, renameres, 0),
1166 PROC(LINK, linkargs, linkres, 0),
1167 PROC(READDIR, readdirargs, readdirres, 3),
1168 PROC(READDIRPLUS, readdirargs, readdirres, 3),
1169 PROC(FSSTAT, fhandle, fsstatres, 0),
1170 PROC(FSINFO, fhandle, fsinfores, 0),
1171 PROC(PATHCONF, fhandle, pathconfres, 0),
1172 PROC(COMMIT, commitargs, commitres, 5),
1173 };
1174
1175 struct rpc_version nfs_version3 = {
1176 .number = 3,
1177 .nrprocs = ARRAY_SIZE(nfs3_procedures),
1178 .procs = nfs3_procedures
1179 };
1180
1181 #ifdef CONFIG_NFS_V3_ACL
1182 static struct rpc_procinfo nfs3_acl_procedures[] = {
1183 [ACLPROC3_GETACL] = {
1184 .p_proc = ACLPROC3_GETACL,
1185 .p_encode = (kxdrproc_t) nfs3_xdr_getaclargs,
1186 .p_decode = (kxdrproc_t) nfs3_xdr_getaclres,
1187 .p_arglen = ACL3_getaclargs_sz,
1188 .p_replen = ACL3_getaclres_sz,
1189 .p_timer = 1,
1190 .p_name = "GETACL",
1191 },
1192 [ACLPROC3_SETACL] = {
1193 .p_proc = ACLPROC3_SETACL,
1194 .p_encode = (kxdrproc_t) nfs3_xdr_setaclargs,
1195 .p_decode = (kxdrproc_t) nfs3_xdr_setaclres,
1196 .p_arglen = ACL3_setaclargs_sz,
1197 .p_replen = ACL3_setaclres_sz,
1198 .p_timer = 0,
1199 .p_name = "SETACL",
1200 },
1201 };
1202
1203 struct rpc_version nfsacl_version3 = {
1204 .number = 3,
1205 .nrprocs = sizeof(nfs3_acl_procedures)/
1206 sizeof(nfs3_acl_procedures[0]),
1207 .procs = nfs3_acl_procedures,
1208 };
1209 #endif /* CONFIG_NFS_V3_ACL */
Linux kernel - Deliverables
This page took 0.055026 seconds and 5 git commands to generate.