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NFS: Reduce stack footprint of nfs_proc_remove()
[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/errno.h>
13 #include <linux/string.h>
14 #include <linux/in.h>
15 #include <linux/pagemap.h>
16 #include <linux/proc_fs.h>
17 #include <linux/kdev_t.h>
18 #include <linux/sunrpc/clnt.h>
19 #include <linux/nfs.h>
20 #include <linux/nfs3.h>
21 #include <linux/nfs_fs.h>
22 #include <linux/nfsacl.h>
23 #include "internal.h"
24
25 #define NFSDBG_FACILITY NFSDBG_XDR
26
27 /* Mapping from NFS error code to "errno" error code. */
28 #define errno_NFSERR_IO EIO
29
30 /*
31 * Declare the space requirements for NFS arguments and replies as
32 * number of 32bit-words
33 */
34 #define NFS3_fhandle_sz (1+16)
35 #define NFS3_fh_sz (NFS3_fhandle_sz) /* shorthand */
36 #define NFS3_sattr_sz (15)
37 #define NFS3_filename_sz (1+(NFS3_MAXNAMLEN>>2))
38 #define NFS3_path_sz (1+(NFS3_MAXPATHLEN>>2))
39 #define NFS3_fattr_sz (21)
40 #define NFS3_wcc_attr_sz (6)
41 #define NFS3_pre_op_attr_sz (1+NFS3_wcc_attr_sz)
42 #define NFS3_post_op_attr_sz (1+NFS3_fattr_sz)
43 #define NFS3_wcc_data_sz (NFS3_pre_op_attr_sz+NFS3_post_op_attr_sz)
44 #define NFS3_fsstat_sz
45 #define NFS3_fsinfo_sz
46 #define NFS3_pathconf_sz
47 #define NFS3_entry_sz (NFS3_filename_sz+3)
48
49 #define NFS3_sattrargs_sz (NFS3_fh_sz+NFS3_sattr_sz+3)
50 #define NFS3_diropargs_sz (NFS3_fh_sz+NFS3_filename_sz)
51 #define NFS3_removeargs_sz (NFS3_fh_sz+NFS3_filename_sz)
52 #define NFS3_accessargs_sz (NFS3_fh_sz+1)
53 #define NFS3_readlinkargs_sz (NFS3_fh_sz)
54 #define NFS3_readargs_sz (NFS3_fh_sz+3)
55 #define NFS3_writeargs_sz (NFS3_fh_sz+5)
56 #define NFS3_createargs_sz (NFS3_diropargs_sz+NFS3_sattr_sz)
57 #define NFS3_mkdirargs_sz (NFS3_diropargs_sz+NFS3_sattr_sz)
58 #define NFS3_symlinkargs_sz (NFS3_diropargs_sz+1+NFS3_sattr_sz)
59 #define NFS3_mknodargs_sz (NFS3_diropargs_sz+2+NFS3_sattr_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+2)
63 #define NFS3_commitargs_sz (NFS3_fh_sz+3)
64
65 #define NFS3_attrstat_sz (1+NFS3_fattr_sz)
66 #define NFS3_wccstat_sz (1+NFS3_wcc_data_sz)
67 #define NFS3_removeres_sz (NFS3_wccstat_sz)
68 #define NFS3_lookupres_sz (1+NFS3_fh_sz+(2 * NFS3_post_op_attr_sz))
69 #define NFS3_accessres_sz (1+NFS3_post_op_attr_sz+1)
70 #define NFS3_readlinkres_sz (1+NFS3_post_op_attr_sz+1)
71 #define NFS3_readres_sz (1+NFS3_post_op_attr_sz+3)
72 #define NFS3_writeres_sz (1+NFS3_wcc_data_sz+4)
73 #define NFS3_createres_sz (1+NFS3_fh_sz+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
74 #define NFS3_renameres_sz (1+(2 * NFS3_wcc_data_sz))
75 #define NFS3_linkres_sz (1+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
76 #define NFS3_readdirres_sz (1+NFS3_post_op_attr_sz+2)
77 #define NFS3_fsstatres_sz (1+NFS3_post_op_attr_sz+13)
78 #define NFS3_fsinfores_sz (1+NFS3_post_op_attr_sz+12)
79 #define NFS3_pathconfres_sz (1+NFS3_post_op_attr_sz+6)
80 #define NFS3_commitres_sz (1+NFS3_wcc_data_sz+2)
81
82 #define ACL3_getaclargs_sz (NFS3_fh_sz+1)
83 #define ACL3_setaclargs_sz (NFS3_fh_sz+1+ \
84 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
85 #define ACL3_getaclres_sz (1+NFS3_post_op_attr_sz+1+ \
86 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
87 #define ACL3_setaclres_sz (1+NFS3_post_op_attr_sz)
88
89 /*
90 * Map file type to S_IFMT bits
91 */
92 static const umode_t nfs_type2fmt[] = {
93 [NF3BAD] = 0,
94 [NF3REG] = S_IFREG,
95 [NF3DIR] = S_IFDIR,
96 [NF3BLK] = S_IFBLK,
97 [NF3CHR] = S_IFCHR,
98 [NF3LNK] = S_IFLNK,
99 [NF3SOCK] = S_IFSOCK,
100 [NF3FIFO] = S_IFIFO,
101 };
102
103 /*
104 * Common NFS XDR functions as inlines
105 */
106 static inline __be32 *
107 xdr_encode_fhandle(__be32 *p, const struct nfs_fh *fh)
108 {
109 return xdr_encode_array(p, fh->data, fh->size);
110 }
111
112 static inline __be32 *
113 xdr_decode_fhandle(__be32 *p, struct nfs_fh *fh)
114 {
115 if ((fh->size = ntohl(*p++)) <= NFS3_FHSIZE) {
116 memcpy(fh->data, p, fh->size);
117 return p + XDR_QUADLEN(fh->size);
118 }
119 return NULL;
120 }
121
122 /*
123 * Encode/decode time.
124 */
125 static inline __be32 *
126 xdr_encode_time3(__be32 *p, struct timespec *timep)
127 {
128 *p++ = htonl(timep->tv_sec);
129 *p++ = htonl(timep->tv_nsec);
130 return p;
131 }
132
133 static inline __be32 *
134 xdr_decode_time3(__be32 *p, struct timespec *timep)
135 {
136 timep->tv_sec = ntohl(*p++);
137 timep->tv_nsec = ntohl(*p++);
138 return p;
139 }
140
141 static __be32 *
142 xdr_decode_fattr(__be32 *p, struct nfs_fattr *fattr)
143 {
144 unsigned int type, major, minor;
145 umode_t fmode;
146
147 type = ntohl(*p++);
148 if (type > NF3FIFO)
149 type = NF3NON;
150 fmode = nfs_type2fmt[type];
151 fattr->mode = (ntohl(*p++) & ~S_IFMT) | fmode;
152 fattr->nlink = ntohl(*p++);
153 fattr->uid = ntohl(*p++);
154 fattr->gid = ntohl(*p++);
155 p = xdr_decode_hyper(p, &fattr->size);
156 p = xdr_decode_hyper(p, &fattr->du.nfs3.used);
157
158 /* Turn remote device info into Linux-specific dev_t */
159 major = ntohl(*p++);
160 minor = ntohl(*p++);
161 fattr->rdev = MKDEV(major, minor);
162 if (MAJOR(fattr->rdev) != major || MINOR(fattr->rdev) != minor)
163 fattr->rdev = 0;
164
165 p = xdr_decode_hyper(p, &fattr->fsid.major);
166 fattr->fsid.minor = 0;
167 p = xdr_decode_hyper(p, &fattr->fileid);
168 p = xdr_decode_time3(p, &fattr->atime);
169 p = xdr_decode_time3(p, &fattr->mtime);
170 p = xdr_decode_time3(p, &fattr->ctime);
171
172 /* Update the mode bits */
173 fattr->valid |= NFS_ATTR_FATTR_V3;
174 return p;
175 }
176
177 static inline __be32 *
178 xdr_encode_sattr(__be32 *p, struct iattr *attr)
179 {
180 if (attr->ia_valid & ATTR_MODE) {
181 *p++ = xdr_one;
182 *p++ = htonl(attr->ia_mode & S_IALLUGO);
183 } else {
184 *p++ = xdr_zero;
185 }
186 if (attr->ia_valid & ATTR_UID) {
187 *p++ = xdr_one;
188 *p++ = htonl(attr->ia_uid);
189 } else {
190 *p++ = xdr_zero;
191 }
192 if (attr->ia_valid & ATTR_GID) {
193 *p++ = xdr_one;
194 *p++ = htonl(attr->ia_gid);
195 } else {
196 *p++ = xdr_zero;
197 }
198 if (attr->ia_valid & ATTR_SIZE) {
199 *p++ = xdr_one;
200 p = xdr_encode_hyper(p, (__u64) attr->ia_size);
201 } else {
202 *p++ = xdr_zero;
203 }
204 if (attr->ia_valid & ATTR_ATIME_SET) {
205 *p++ = xdr_two;
206 p = xdr_encode_time3(p, &attr->ia_atime);
207 } else if (attr->ia_valid & ATTR_ATIME) {
208 *p++ = xdr_one;
209 } else {
210 *p++ = xdr_zero;
211 }
212 if (attr->ia_valid & ATTR_MTIME_SET) {
213 *p++ = xdr_two;
214 p = xdr_encode_time3(p, &attr->ia_mtime);
215 } else if (attr->ia_valid & ATTR_MTIME) {
216 *p++ = xdr_one;
217 } else {
218 *p++ = xdr_zero;
219 }
220 return p;
221 }
222
223 static inline __be32 *
224 xdr_decode_wcc_attr(__be32 *p, struct nfs_fattr *fattr)
225 {
226 p = xdr_decode_hyper(p, &fattr->pre_size);
227 p = xdr_decode_time3(p, &fattr->pre_mtime);
228 p = xdr_decode_time3(p, &fattr->pre_ctime);
229 fattr->valid |= NFS_ATTR_FATTR_PRESIZE
230 | NFS_ATTR_FATTR_PREMTIME
231 | NFS_ATTR_FATTR_PRECTIME;
232 return p;
233 }
234
235 static inline __be32 *
236 xdr_decode_post_op_attr(__be32 *p, struct nfs_fattr *fattr)
237 {
238 if (*p++)
239 p = xdr_decode_fattr(p, fattr);
240 return p;
241 }
242
243 static inline __be32 *
244 xdr_decode_pre_op_attr(__be32 *p, struct nfs_fattr *fattr)
245 {
246 if (*p++)
247 return xdr_decode_wcc_attr(p, fattr);
248 return p;
249 }
250
251
252 static inline __be32 *
253 xdr_decode_wcc_data(__be32 *p, struct nfs_fattr *fattr)
254 {
255 p = xdr_decode_pre_op_attr(p, fattr);
256 return xdr_decode_post_op_attr(p, fattr);
257 }
258
259 /*
260 * NFS encode functions
261 */
262
263 /*
264 * Encode file handle argument
265 */
266 static int
267 nfs3_xdr_fhandle(struct rpc_rqst *req, __be32 *p, struct nfs_fh *fh)
268 {
269 p = xdr_encode_fhandle(p, fh);
270 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
271 return 0;
272 }
273
274 /*
275 * Encode SETATTR arguments
276 */
277 static int
278 nfs3_xdr_sattrargs(struct rpc_rqst *req, __be32 *p, struct nfs3_sattrargs *args)
279 {
280 p = xdr_encode_fhandle(p, args->fh);
281 p = xdr_encode_sattr(p, args->sattr);
282 *p++ = htonl(args->guard);
283 if (args->guard)
284 p = xdr_encode_time3(p, &args->guardtime);
285 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
286 return 0;
287 }
288
289 /*
290 * Encode directory ops argument
291 */
292 static int
293 nfs3_xdr_diropargs(struct rpc_rqst *req, __be32 *p, struct nfs3_diropargs *args)
294 {
295 p = xdr_encode_fhandle(p, args->fh);
296 p = xdr_encode_array(p, args->name, args->len);
297 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
298 return 0;
299 }
300
301 /*
302 * Encode REMOVE argument
303 */
304 static int
305 nfs3_xdr_removeargs(struct rpc_rqst *req, __be32 *p, const struct nfs_removeargs *args)
306 {
307 p = xdr_encode_fhandle(p, args->fh);
308 p = xdr_encode_array(p, args->name.name, args->name.len);
309 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
310 return 0;
311 }
312
313 /*
314 * Encode access() argument
315 */
316 static int
317 nfs3_xdr_accessargs(struct rpc_rqst *req, __be32 *p, struct nfs3_accessargs *args)
318 {
319 p = xdr_encode_fhandle(p, args->fh);
320 *p++ = htonl(args->access);
321 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
322 return 0;
323 }
324
325 /*
326 * Arguments to a READ call. Since we read data directly into the page
327 * cache, we also set up the reply iovec here so that iov[1] points
328 * exactly to the page we want to fetch.
329 */
330 static int
331 nfs3_xdr_readargs(struct rpc_rqst *req, __be32 *p, struct nfs_readargs *args)
332 {
333 struct rpc_auth *auth = req->rq_task->tk_msg.rpc_cred->cr_auth;
334 unsigned int replen;
335 u32 count = args->count;
336
337 p = xdr_encode_fhandle(p, args->fh);
338 p = xdr_encode_hyper(p, args->offset);
339 *p++ = htonl(count);
340 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
341
342 /* Inline the page array */
343 replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS3_readres_sz) << 2;
344 xdr_inline_pages(&req->rq_rcv_buf, replen,
345 args->pages, args->pgbase, count);
346 req->rq_rcv_buf.flags |= XDRBUF_READ;
347 return 0;
348 }
349
350 /*
351 * Write arguments. Splice the buffer to be written into the iovec.
352 */
353 static int
354 nfs3_xdr_writeargs(struct rpc_rqst *req, __be32 *p, struct nfs_writeargs *args)
355 {
356 struct xdr_buf *sndbuf = &req->rq_snd_buf;
357 u32 count = args->count;
358
359 p = xdr_encode_fhandle(p, args->fh);
360 p = xdr_encode_hyper(p, args->offset);
361 *p++ = htonl(count);
362 *p++ = htonl(args->stable);
363 *p++ = htonl(count);
364 sndbuf->len = xdr_adjust_iovec(sndbuf->head, p);
365
366 /* Copy the page array */
367 xdr_encode_pages(sndbuf, args->pages, args->pgbase, count);
368 sndbuf->flags |= XDRBUF_WRITE;
369 return 0;
370 }
371
372 /*
373 * Encode CREATE arguments
374 */
375 static int
376 nfs3_xdr_createargs(struct rpc_rqst *req, __be32 *p, struct nfs3_createargs *args)
377 {
378 p = xdr_encode_fhandle(p, args->fh);
379 p = xdr_encode_array(p, args->name, args->len);
380
381 *p++ = htonl(args->createmode);
382 if (args->createmode == NFS3_CREATE_EXCLUSIVE) {
383 *p++ = args->verifier[0];
384 *p++ = args->verifier[1];
385 } else
386 p = xdr_encode_sattr(p, args->sattr);
387
388 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
389 return 0;
390 }
391
392 /*
393 * Encode MKDIR arguments
394 */
395 static int
396 nfs3_xdr_mkdirargs(struct rpc_rqst *req, __be32 *p, struct nfs3_mkdirargs *args)
397 {
398 p = xdr_encode_fhandle(p, args->fh);
399 p = xdr_encode_array(p, args->name, args->len);
400 p = xdr_encode_sattr(p, args->sattr);
401 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
402 return 0;
403 }
404
405 /*
406 * Encode SYMLINK arguments
407 */
408 static int
409 nfs3_xdr_symlinkargs(struct rpc_rqst *req, __be32 *p, struct nfs3_symlinkargs *args)
410 {
411 p = xdr_encode_fhandle(p, args->fromfh);
412 p = xdr_encode_array(p, args->fromname, args->fromlen);
413 p = xdr_encode_sattr(p, args->sattr);
414 *p++ = htonl(args->pathlen);
415 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
416
417 /* Copy the page */
418 xdr_encode_pages(&req->rq_snd_buf, args->pages, 0, args->pathlen);
419 return 0;
420 }
421
422 /*
423 * Encode MKNOD arguments
424 */
425 static int
426 nfs3_xdr_mknodargs(struct rpc_rqst *req, __be32 *p, struct nfs3_mknodargs *args)
427 {
428 p = xdr_encode_fhandle(p, args->fh);
429 p = xdr_encode_array(p, args->name, args->len);
430 *p++ = htonl(args->type);
431 p = xdr_encode_sattr(p, args->sattr);
432 if (args->type == NF3CHR || args->type == NF3BLK) {
433 *p++ = htonl(MAJOR(args->rdev));
434 *p++ = htonl(MINOR(args->rdev));
435 }
436
437 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
438 return 0;
439 }
440
441 /*
442 * Encode RENAME arguments
443 */
444 static int
445 nfs3_xdr_renameargs(struct rpc_rqst *req, __be32 *p, struct nfs3_renameargs *args)
446 {
447 p = xdr_encode_fhandle(p, args->fromfh);
448 p = xdr_encode_array(p, args->fromname, args->fromlen);
449 p = xdr_encode_fhandle(p, args->tofh);
450 p = xdr_encode_array(p, args->toname, args->tolen);
451 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
452 return 0;
453 }
454
455 /*
456 * Encode LINK arguments
457 */
458 static int
459 nfs3_xdr_linkargs(struct rpc_rqst *req, __be32 *p, struct nfs3_linkargs *args)
460 {
461 p = xdr_encode_fhandle(p, args->fromfh);
462 p = xdr_encode_fhandle(p, args->tofh);
463 p = xdr_encode_array(p, args->toname, args->tolen);
464 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
465 return 0;
466 }
467
468 /*
469 * Encode arguments to readdir call
470 */
471 static int
472 nfs3_xdr_readdirargs(struct rpc_rqst *req, __be32 *p, struct nfs3_readdirargs *args)
473 {
474 struct rpc_auth *auth = req->rq_task->tk_msg.rpc_cred->cr_auth;
475 unsigned int replen;
476 u32 count = args->count;
477
478 p = xdr_encode_fhandle(p, args->fh);
479 p = xdr_encode_hyper(p, args->cookie);
480 *p++ = args->verf[0];
481 *p++ = args->verf[1];
482 if (args->plus) {
483 /* readdirplus: need dircount + buffer size.
484 * We just make sure we make dircount big enough */
485 *p++ = htonl(count >> 3);
486 }
487 *p++ = htonl(count);
488 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
489
490 /* Inline the page array */
491 replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS3_readdirres_sz) << 2;
492 xdr_inline_pages(&req->rq_rcv_buf, replen, args->pages, 0, count);
493 return 0;
494 }
495
496 /*
497 * Decode the result of a readdir call.
498 * We just check for syntactical correctness.
499 */
500 static int
501 nfs3_xdr_readdirres(struct rpc_rqst *req, __be32 *p, struct nfs3_readdirres *res)
502 {
503 struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
504 struct kvec *iov = rcvbuf->head;
505 struct page **page;
506 size_t hdrlen;
507 u32 len, recvd, pglen;
508 int status, nr = 0;
509 __be32 *entry, *end, *kaddr;
510
511 status = ntohl(*p++);
512 /* Decode post_op_attrs */
513 p = xdr_decode_post_op_attr(p, res->dir_attr);
514 if (status)
515 return nfs_stat_to_errno(status);
516 /* Decode verifier cookie */
517 if (res->verf) {
518 res->verf[0] = *p++;
519 res->verf[1] = *p++;
520 } else {
521 p += 2;
522 }
523
524 hdrlen = (u8 *) p - (u8 *) iov->iov_base;
525 if (iov->iov_len < hdrlen) {
526 dprintk("NFS: READDIR reply header overflowed:"
527 "length %Zu > %Zu\n", hdrlen, iov->iov_len);
528 return -errno_NFSERR_IO;
529 } else if (iov->iov_len != hdrlen) {
530 dprintk("NFS: READDIR header is short. iovec will be shifted.\n");
531 xdr_shift_buf(rcvbuf, iov->iov_len - hdrlen);
532 }
533
534 pglen = rcvbuf->page_len;
535 recvd = rcvbuf->len - hdrlen;
536 if (pglen > recvd)
537 pglen = recvd;
538 page = rcvbuf->pages;
539 kaddr = p = kmap_atomic(*page, KM_USER0);
540 end = (__be32 *)((char *)p + pglen);
541 entry = p;
542
543 /* Make sure the packet actually has a value_follows and EOF entry */
544 if ((entry + 1) > end)
545 goto short_pkt;
546
547 for (; *p++; nr++) {
548 if (p + 3 > end)
549 goto short_pkt;
550 p += 2; /* inode # */
551 len = ntohl(*p++); /* string length */
552 p += XDR_QUADLEN(len) + 2; /* name + cookie */
553 if (len > NFS3_MAXNAMLEN) {
554 dprintk("NFS: giant filename in readdir (len 0x%x)!\n",
555 len);
556 goto err_unmap;
557 }
558
559 if (res->plus) {
560 /* post_op_attr */
561 if (p + 2 > end)
562 goto short_pkt;
563 if (*p++) {
564 p += 21;
565 if (p + 1 > end)
566 goto short_pkt;
567 }
568 /* post_op_fh3 */
569 if (*p++) {
570 if (p + 1 > end)
571 goto short_pkt;
572 len = ntohl(*p++);
573 if (len > NFS3_FHSIZE) {
574 dprintk("NFS: giant filehandle in "
575 "readdir (len 0x%x)!\n", len);
576 goto err_unmap;
577 }
578 p += XDR_QUADLEN(len);
579 }
580 }
581
582 if (p + 2 > end)
583 goto short_pkt;
584 entry = p;
585 }
586
587 /*
588 * Apparently some server sends responses that are a valid size, but
589 * contain no entries, and have value_follows==0 and EOF==0. For
590 * those, just set the EOF marker.
591 */
592 if (!nr && entry[1] == 0) {
593 dprintk("NFS: readdir reply truncated!\n");
594 entry[1] = 1;
595 }
596 out:
597 kunmap_atomic(kaddr, KM_USER0);
598 return nr;
599 short_pkt:
600 /*
601 * When we get a short packet there are 2 possibilities. We can
602 * return an error, or fix up the response to look like a valid
603 * response and return what we have so far. If there are no
604 * entries and the packet was short, then return -EIO. If there
605 * are valid entries in the response, return them and pretend that
606 * the call was successful, but incomplete. The caller can retry the
607 * readdir starting at the last cookie.
608 */
609 entry[0] = entry[1] = 0;
610 if (!nr)
611 nr = -errno_NFSERR_IO;
612 goto out;
613 err_unmap:
614 nr = -errno_NFSERR_IO;
615 goto out;
616 }
617
618 __be32 *
619 nfs3_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus)
620 {
621 struct nfs_entry old = *entry;
622
623 if (!*p++) {
624 if (!*p)
625 return ERR_PTR(-EAGAIN);
626 entry->eof = 1;
627 return ERR_PTR(-EBADCOOKIE);
628 }
629
630 p = xdr_decode_hyper(p, &entry->ino);
631 entry->len = ntohl(*p++);
632 entry->name = (const char *) p;
633 p += XDR_QUADLEN(entry->len);
634 entry->prev_cookie = entry->cookie;
635 p = xdr_decode_hyper(p, &entry->cookie);
636
637 if (plus) {
638 entry->fattr->valid = 0;
639 p = xdr_decode_post_op_attr(p, entry->fattr);
640 /* In fact, a post_op_fh3: */
641 if (*p++) {
642 p = xdr_decode_fhandle(p, entry->fh);
643 /* Ugh -- server reply was truncated */
644 if (p == NULL) {
645 dprintk("NFS: FH truncated\n");
646 *entry = old;
647 return ERR_PTR(-EAGAIN);
648 }
649 } else
650 memset((u8*)(entry->fh), 0, sizeof(*entry->fh));
651 }
652
653 entry->eof = !p[0] && p[1];
654 return p;
655 }
656
657 /*
658 * Encode COMMIT arguments
659 */
660 static int
661 nfs3_xdr_commitargs(struct rpc_rqst *req, __be32 *p, struct nfs_writeargs *args)
662 {
663 p = xdr_encode_fhandle(p, args->fh);
664 p = xdr_encode_hyper(p, args->offset);
665 *p++ = htonl(args->count);
666 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
667 return 0;
668 }
669
670 #ifdef CONFIG_NFS_V3_ACL
671 /*
672 * Encode GETACL arguments
673 */
674 static int
675 nfs3_xdr_getaclargs(struct rpc_rqst *req, __be32 *p,
676 struct nfs3_getaclargs *args)
677 {
678 struct rpc_auth *auth = req->rq_task->tk_msg.rpc_cred->cr_auth;
679 unsigned int replen;
680
681 p = xdr_encode_fhandle(p, args->fh);
682 *p++ = htonl(args->mask);
683 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
684
685 if (args->mask & (NFS_ACL | NFS_DFACL)) {
686 /* Inline the page array */
687 replen = (RPC_REPHDRSIZE + auth->au_rslack +
688 ACL3_getaclres_sz) << 2;
689 xdr_inline_pages(&req->rq_rcv_buf, replen, args->pages, 0,
690 NFSACL_MAXPAGES << PAGE_SHIFT);
691 }
692 return 0;
693 }
694
695 /*
696 * Encode SETACL arguments
697 */
698 static int
699 nfs3_xdr_setaclargs(struct rpc_rqst *req, __be32 *p,
700 struct nfs3_setaclargs *args)
701 {
702 struct xdr_buf *buf = &req->rq_snd_buf;
703 unsigned int base;
704 int err;
705
706 p = xdr_encode_fhandle(p, NFS_FH(args->inode));
707 *p++ = htonl(args->mask);
708 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
709 base = req->rq_slen;
710
711 if (args->npages != 0)
712 xdr_encode_pages(buf, args->pages, 0, args->len);
713 else
714 req->rq_slen = xdr_adjust_iovec(req->rq_svec,
715 p + XDR_QUADLEN(args->len));
716
717 err = nfsacl_encode(buf, base, args->inode,
718 (args->mask & NFS_ACL) ?
719 args->acl_access : NULL, 1, 0);
720 if (err > 0)
721 err = nfsacl_encode(buf, base + err, args->inode,
722 (args->mask & NFS_DFACL) ?
723 args->acl_default : NULL, 1,
724 NFS_ACL_DEFAULT);
725 return (err > 0) ? 0 : err;
726 }
727 #endif /* CONFIG_NFS_V3_ACL */
728
729 /*
730 * NFS XDR decode functions
731 */
732
733 /*
734 * Decode attrstat reply.
735 */
736 static int
737 nfs3_xdr_attrstat(struct rpc_rqst *req, __be32 *p, struct nfs_fattr *fattr)
738 {
739 int status;
740
741 if ((status = ntohl(*p++)))
742 return nfs_stat_to_errno(status);
743 xdr_decode_fattr(p, fattr);
744 return 0;
745 }
746
747 /*
748 * Decode status+wcc_data reply
749 * SATTR, REMOVE, RMDIR
750 */
751 static int
752 nfs3_xdr_wccstat(struct rpc_rqst *req, __be32 *p, struct nfs_fattr *fattr)
753 {
754 int status;
755
756 if ((status = ntohl(*p++)))
757 status = nfs_stat_to_errno(status);
758 xdr_decode_wcc_data(p, fattr);
759 return status;
760 }
761
762 static int
763 nfs3_xdr_removeres(struct rpc_rqst *req, __be32 *p, struct nfs_removeres *res)
764 {
765 return nfs3_xdr_wccstat(req, p, res->dir_attr);
766 }
767
768 /*
769 * Decode LOOKUP reply
770 */
771 static int
772 nfs3_xdr_lookupres(struct rpc_rqst *req, __be32 *p, struct nfs3_diropres *res)
773 {
774 int status;
775
776 if ((status = ntohl(*p++))) {
777 status = nfs_stat_to_errno(status);
778 } else {
779 if (!(p = xdr_decode_fhandle(p, res->fh)))
780 return -errno_NFSERR_IO;
781 p = xdr_decode_post_op_attr(p, res->fattr);
782 }
783 xdr_decode_post_op_attr(p, res->dir_attr);
784 return status;
785 }
786
787 /*
788 * Decode ACCESS reply
789 */
790 static int
791 nfs3_xdr_accessres(struct rpc_rqst *req, __be32 *p, struct nfs3_accessres *res)
792 {
793 int status = ntohl(*p++);
794
795 p = xdr_decode_post_op_attr(p, res->fattr);
796 if (status)
797 return nfs_stat_to_errno(status);
798 res->access = ntohl(*p++);
799 return 0;
800 }
801
802 static int
803 nfs3_xdr_readlinkargs(struct rpc_rqst *req, __be32 *p, struct nfs3_readlinkargs *args)
804 {
805 struct rpc_auth *auth = req->rq_task->tk_msg.rpc_cred->cr_auth;
806 unsigned int replen;
807
808 p = xdr_encode_fhandle(p, args->fh);
809 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
810
811 /* Inline the page array */
812 replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS3_readlinkres_sz) << 2;
813 xdr_inline_pages(&req->rq_rcv_buf, replen, args->pages, args->pgbase, args->pglen);
814 return 0;
815 }
816
817 /*
818 * Decode READLINK reply
819 */
820 static int
821 nfs3_xdr_readlinkres(struct rpc_rqst *req, __be32 *p, struct nfs_fattr *fattr)
822 {
823 struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
824 struct kvec *iov = rcvbuf->head;
825 size_t hdrlen;
826 u32 len, recvd;
827 char *kaddr;
828 int status;
829
830 status = ntohl(*p++);
831 p = xdr_decode_post_op_attr(p, fattr);
832
833 if (status != 0)
834 return nfs_stat_to_errno(status);
835
836 /* Convert length of symlink */
837 len = ntohl(*p++);
838 if (len >= rcvbuf->page_len) {
839 dprintk("nfs: server returned giant symlink!\n");
840 return -ENAMETOOLONG;
841 }
842
843 hdrlen = (u8 *) p - (u8 *) iov->iov_base;
844 if (iov->iov_len < hdrlen) {
845 dprintk("NFS: READLINK reply header overflowed:"
846 "length %Zu > %Zu\n", hdrlen, iov->iov_len);
847 return -errno_NFSERR_IO;
848 } else if (iov->iov_len != hdrlen) {
849 dprintk("NFS: READLINK header is short. "
850 "iovec will be shifted.\n");
851 xdr_shift_buf(rcvbuf, iov->iov_len - hdrlen);
852 }
853 recvd = req->rq_rcv_buf.len - hdrlen;
854 if (recvd < len) {
855 dprintk("NFS: server cheating in readlink reply: "
856 "count %u > recvd %u\n", len, recvd);
857 return -EIO;
858 }
859
860 /* NULL terminate the string we got */
861 kaddr = (char*)kmap_atomic(rcvbuf->pages[0], KM_USER0);
862 kaddr[len+rcvbuf->page_base] = '\0';
863 kunmap_atomic(kaddr, KM_USER0);
864 return 0;
865 }
866
867 /*
868 * Decode READ reply
869 */
870 static int
871 nfs3_xdr_readres(struct rpc_rqst *req, __be32 *p, struct nfs_readres *res)
872 {
873 struct kvec *iov = req->rq_rcv_buf.head;
874 size_t hdrlen;
875 u32 count, ocount, recvd;
876 int status;
877
878 status = ntohl(*p++);
879 p = xdr_decode_post_op_attr(p, res->fattr);
880
881 if (status != 0)
882 return nfs_stat_to_errno(status);
883
884 /* Decode reply count and EOF flag. NFSv3 is somewhat redundant
885 * in that it puts the count both in the res struct and in the
886 * opaque data count. */
887 count = ntohl(*p++);
888 res->eof = ntohl(*p++);
889 ocount = ntohl(*p++);
890
891 if (ocount != count) {
892 dprintk("NFS: READ count doesn't match RPC opaque count.\n");
893 return -errno_NFSERR_IO;
894 }
895
896 hdrlen = (u8 *) p - (u8 *) iov->iov_base;
897 if (iov->iov_len < hdrlen) {
898 dprintk("NFS: READ reply header overflowed:"
899 "length %Zu > %Zu\n", hdrlen, iov->iov_len);
900 return -errno_NFSERR_IO;
901 } else if (iov->iov_len != hdrlen) {
902 dprintk("NFS: READ header is short. iovec will be shifted.\n");
903 xdr_shift_buf(&req->rq_rcv_buf, iov->iov_len - hdrlen);
904 }
905
906 recvd = req->rq_rcv_buf.len - hdrlen;
907 if (count > recvd) {
908 dprintk("NFS: server cheating in read reply: "
909 "count %u > recvd %u\n", count, recvd);
910 count = recvd;
911 res->eof = 0;
912 }
913
914 if (count < res->count)
915 res->count = count;
916
917 return count;
918 }
919
920 /*
921 * Decode WRITE response
922 */
923 static int
924 nfs3_xdr_writeres(struct rpc_rqst *req, __be32 *p, struct nfs_writeres *res)
925 {
926 int status;
927
928 status = ntohl(*p++);
929 p = xdr_decode_wcc_data(p, res->fattr);
930
931 if (status != 0)
932 return nfs_stat_to_errno(status);
933
934 res->count = ntohl(*p++);
935 res->verf->committed = (enum nfs3_stable_how)ntohl(*p++);
936 res->verf->verifier[0] = *p++;
937 res->verf->verifier[1] = *p++;
938
939 return res->count;
940 }
941
942 /*
943 * Decode a CREATE response
944 */
945 static int
946 nfs3_xdr_createres(struct rpc_rqst *req, __be32 *p, struct nfs3_diropres *res)
947 {
948 int status;
949
950 status = ntohl(*p++);
951 if (status == 0) {
952 if (*p++) {
953 if (!(p = xdr_decode_fhandle(p, res->fh)))
954 return -errno_NFSERR_IO;
955 p = xdr_decode_post_op_attr(p, res->fattr);
956 } else {
957 memset(res->fh, 0, sizeof(*res->fh));
958 /* Do decode post_op_attr but set it to NULL */
959 p = xdr_decode_post_op_attr(p, res->fattr);
960 res->fattr->valid = 0;
961 }
962 } else {
963 status = nfs_stat_to_errno(status);
964 }
965 p = xdr_decode_wcc_data(p, res->dir_attr);
966 return status;
967 }
968
969 /*
970 * Decode RENAME reply
971 */
972 static int
973 nfs3_xdr_renameres(struct rpc_rqst *req, __be32 *p, struct nfs3_renameres *res)
974 {
975 int status;
976
977 if ((status = ntohl(*p++)) != 0)
978 status = nfs_stat_to_errno(status);
979 p = xdr_decode_wcc_data(p, res->fromattr);
980 p = xdr_decode_wcc_data(p, res->toattr);
981 return status;
982 }
983
984 /*
985 * Decode LINK reply
986 */
987 static int
988 nfs3_xdr_linkres(struct rpc_rqst *req, __be32 *p, struct nfs3_linkres *res)
989 {
990 int status;
991
992 if ((status = ntohl(*p++)) != 0)
993 status = nfs_stat_to_errno(status);
994 p = xdr_decode_post_op_attr(p, res->fattr);
995 p = xdr_decode_wcc_data(p, res->dir_attr);
996 return status;
997 }
998
999 /*
1000 * Decode FSSTAT reply
1001 */
1002 static int
1003 nfs3_xdr_fsstatres(struct rpc_rqst *req, __be32 *p, struct nfs_fsstat *res)
1004 {
1005 int status;
1006
1007 status = ntohl(*p++);
1008
1009 p = xdr_decode_post_op_attr(p, res->fattr);
1010 if (status != 0)
1011 return nfs_stat_to_errno(status);
1012
1013 p = xdr_decode_hyper(p, &res->tbytes);
1014 p = xdr_decode_hyper(p, &res->fbytes);
1015 p = xdr_decode_hyper(p, &res->abytes);
1016 p = xdr_decode_hyper(p, &res->tfiles);
1017 p = xdr_decode_hyper(p, &res->ffiles);
1018 p = xdr_decode_hyper(p, &res->afiles);
1019
1020 /* ignore invarsec */
1021 return 0;
1022 }
1023
1024 /*
1025 * Decode FSINFO reply
1026 */
1027 static int
1028 nfs3_xdr_fsinfores(struct rpc_rqst *req, __be32 *p, struct nfs_fsinfo *res)
1029 {
1030 int status;
1031
1032 status = ntohl(*p++);
1033
1034 p = xdr_decode_post_op_attr(p, res->fattr);
1035 if (status != 0)
1036 return nfs_stat_to_errno(status);
1037
1038 res->rtmax = ntohl(*p++);
1039 res->rtpref = ntohl(*p++);
1040 res->rtmult = ntohl(*p++);
1041 res->wtmax = ntohl(*p++);
1042 res->wtpref = ntohl(*p++);
1043 res->wtmult = ntohl(*p++);
1044 res->dtpref = ntohl(*p++);
1045 p = xdr_decode_hyper(p, &res->maxfilesize);
1046
1047 /* ignore time_delta and properties */
1048 res->lease_time = 0;
1049 return 0;
1050 }
1051
1052 /*
1053 * Decode PATHCONF reply
1054 */
1055 static int
1056 nfs3_xdr_pathconfres(struct rpc_rqst *req, __be32 *p, struct nfs_pathconf *res)
1057 {
1058 int status;
1059
1060 status = ntohl(*p++);
1061
1062 p = xdr_decode_post_op_attr(p, res->fattr);
1063 if (status != 0)
1064 return nfs_stat_to_errno(status);
1065 res->max_link = ntohl(*p++);
1066 res->max_namelen = ntohl(*p++);
1067
1068 /* ignore remaining fields */
1069 return 0;
1070 }
1071
1072 /*
1073 * Decode COMMIT reply
1074 */
1075 static int
1076 nfs3_xdr_commitres(struct rpc_rqst *req, __be32 *p, struct nfs_writeres *res)
1077 {
1078 int status;
1079
1080 status = ntohl(*p++);
1081 p = xdr_decode_wcc_data(p, res->fattr);
1082 if (status != 0)
1083 return nfs_stat_to_errno(status);
1084
1085 res->verf->verifier[0] = *p++;
1086 res->verf->verifier[1] = *p++;
1087 return 0;
1088 }
1089
1090 #ifdef CONFIG_NFS_V3_ACL
1091 /*
1092 * Decode GETACL reply
1093 */
1094 static int
1095 nfs3_xdr_getaclres(struct rpc_rqst *req, __be32 *p,
1096 struct nfs3_getaclres *res)
1097 {
1098 struct xdr_buf *buf = &req->rq_rcv_buf;
1099 int status = ntohl(*p++);
1100 struct posix_acl **acl;
1101 unsigned int *aclcnt;
1102 int err, base;
1103
1104 if (status != 0)
1105 return nfs_stat_to_errno(status);
1106 p = xdr_decode_post_op_attr(p, res->fattr);
1107 res->mask = ntohl(*p++);
1108 if (res->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
1109 return -EINVAL;
1110 base = (char *)p - (char *)req->rq_rcv_buf.head->iov_base;
1111
1112 acl = (res->mask & NFS_ACL) ? &res->acl_access : NULL;
1113 aclcnt = (res->mask & NFS_ACLCNT) ? &res->acl_access_count : NULL;
1114 err = nfsacl_decode(buf, base, aclcnt, acl);
1115
1116 acl = (res->mask & NFS_DFACL) ? &res->acl_default : NULL;
1117 aclcnt = (res->mask & NFS_DFACLCNT) ? &res->acl_default_count : NULL;
1118 if (err > 0)
1119 err = nfsacl_decode(buf, base + err, aclcnt, acl);
1120 return (err > 0) ? 0 : err;
1121 }
1122
1123 /*
1124 * Decode setacl reply.
1125 */
1126 static int
1127 nfs3_xdr_setaclres(struct rpc_rqst *req, __be32 *p, struct nfs_fattr *fattr)
1128 {
1129 int status = ntohl(*p++);
1130
1131 if (status)
1132 return nfs_stat_to_errno(status);
1133 xdr_decode_post_op_attr(p, fattr);
1134 return 0;
1135 }
1136 #endif /* CONFIG_NFS_V3_ACL */
1137
1138 #define PROC(proc, argtype, restype, timer) \
1139 [NFS3PROC_##proc] = { \
1140 .p_proc = NFS3PROC_##proc, \
1141 .p_encode = (kxdrproc_t) nfs3_xdr_##argtype, \
1142 .p_decode = (kxdrproc_t) nfs3_xdr_##restype, \
1143 .p_arglen = NFS3_##argtype##_sz, \
1144 .p_replen = NFS3_##restype##_sz, \
1145 .p_timer = timer, \
1146 .p_statidx = NFS3PROC_##proc, \
1147 .p_name = #proc, \
1148 }
1149
1150 struct rpc_procinfo nfs3_procedures[] = {
1151 PROC(GETATTR, fhandle, attrstat, 1),
1152 PROC(SETATTR, sattrargs, wccstat, 0),
1153 PROC(LOOKUP, diropargs, lookupres, 2),
1154 PROC(ACCESS, accessargs, accessres, 1),
1155 PROC(READLINK, readlinkargs, readlinkres, 3),
1156 PROC(READ, readargs, readres, 3),
1157 PROC(WRITE, writeargs, writeres, 4),
1158 PROC(CREATE, createargs, createres, 0),
1159 PROC(MKDIR, mkdirargs, createres, 0),
1160 PROC(SYMLINK, symlinkargs, createres, 0),
1161 PROC(MKNOD, mknodargs, createres, 0),
1162 PROC(REMOVE, removeargs, removeres, 0),
1163 PROC(RMDIR, diropargs, wccstat, 0),
1164 PROC(RENAME, renameargs, renameres, 0),
1165 PROC(LINK, linkargs, linkres, 0),
1166 PROC(READDIR, readdirargs, readdirres, 3),
1167 PROC(READDIRPLUS, readdirargs, readdirres, 3),
1168 PROC(FSSTAT, fhandle, fsstatres, 0),
1169 PROC(FSINFO, fhandle, fsinfores, 0),
1170 PROC(PATHCONF, fhandle, pathconfres, 0),
1171 PROC(COMMIT, commitargs, commitres, 5),
1172 };
1173
1174 struct rpc_version nfs_version3 = {
1175 .number = 3,
1176 .nrprocs = ARRAY_SIZE(nfs3_procedures),
1177 .procs = nfs3_procedures
1178 };
1179
1180 #ifdef CONFIG_NFS_V3_ACL
1181 static struct rpc_procinfo nfs3_acl_procedures[] = {
1182 [ACLPROC3_GETACL] = {
1183 .p_proc = ACLPROC3_GETACL,
1184 .p_encode = (kxdrproc_t) nfs3_xdr_getaclargs,
1185 .p_decode = (kxdrproc_t) nfs3_xdr_getaclres,
1186 .p_arglen = ACL3_getaclargs_sz,
1187 .p_replen = ACL3_getaclres_sz,
1188 .p_timer = 1,
1189 .p_name = "GETACL",
1190 },
1191 [ACLPROC3_SETACL] = {
1192 .p_proc = ACLPROC3_SETACL,
1193 .p_encode = (kxdrproc_t) nfs3_xdr_setaclargs,
1194 .p_decode = (kxdrproc_t) nfs3_xdr_setaclres,
1195 .p_arglen = ACL3_setaclargs_sz,
1196 .p_replen = ACL3_setaclres_sz,
1197 .p_timer = 0,
1198 .p_name = "SETACL",
1199 },
1200 };
1201
1202 struct rpc_version nfsacl_version3 = {
1203 .number = 3,
1204 .nrprocs = sizeof(nfs3_acl_procedures)/
1205 sizeof(nfs3_acl_procedures[0]),
1206 .procs = nfs3_acl_procedures,
1207 };
1208 #endif /* CONFIG_NFS_V3_ACL */
Linux kernel - Deliverables
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