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1/*
2 * XDR support for nfsd/protocol version 3.
3 *
4 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
5 *
6 * 2003-08-09 Jamie Lokier: Use htonl() for nanoseconds, not htons()!
7 */
8
9#include <linux/namei.h>
10#include <linux/sunrpc/svc_xprt.h>
11#include "xdr3.h"
12#include "auth.h"
13#include "netns.h"
14#include "vfs.h"
15
16#define NFSDDBG_FACILITY NFSDDBG_XDR
17
18
19/*
20 * Mapping of S_IF* types to NFS file types
21 */
22static u32 nfs3_ftypes[] = {
23 NF3NON, NF3FIFO, NF3CHR, NF3BAD,
24 NF3DIR, NF3BAD, NF3BLK, NF3BAD,
25 NF3REG, NF3BAD, NF3LNK, NF3BAD,
26 NF3SOCK, NF3BAD, NF3LNK, NF3BAD,
27};
28
29/*
30 * XDR functions for basic NFS types
31 */
32static __be32 *
33encode_time3(__be32 *p, struct timespec *time)
34{
35 *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);
36 return p;
37}
38
39static __be32 *
40decode_time3(__be32 *p, struct timespec *time)
41{
42 time->tv_sec = ntohl(*p++);
43 time->tv_nsec = ntohl(*p++);
44 return p;
45}
46
47static __be32 *
48decode_fh(__be32 *p, struct svc_fh *fhp)
49{
50 unsigned int size;
51 fh_init(fhp, NFS3_FHSIZE);
52 size = ntohl(*p++);
53 if (size > NFS3_FHSIZE)
54 return NULL;
55
56 memcpy(&fhp->fh_handle.fh_base, p, size);
57 fhp->fh_handle.fh_size = size;
58 return p + XDR_QUADLEN(size);
59}
60
61/* Helper function for NFSv3 ACL code */
62__be32 *nfs3svc_decode_fh(__be32 *p, struct svc_fh *fhp)
63{
64 return decode_fh(p, fhp);
65}
66
67static __be32 *
68encode_fh(__be32 *p, struct svc_fh *fhp)
69{
70 unsigned int size = fhp->fh_handle.fh_size;
71 *p++ = htonl(size);
72 if (size) p[XDR_QUADLEN(size)-1]=0;
73 memcpy(p, &fhp->fh_handle.fh_base, size);
74 return p + XDR_QUADLEN(size);
75}
76
77/*
78 * Decode a file name and make sure that the path contains
79 * no slashes or null bytes.
80 */
81static __be32 *
82decode_filename(__be32 *p, char **namp, unsigned int *lenp)
83{
84 char *name;
85 unsigned int i;
86
87 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) {
88 for (i = 0, name = *namp; i < *lenp; i++, name++) {
89 if (*name == '\0' || *name == '/')
90 return NULL;
91 }
92 }
93
94 return p;
95}
96
97static __be32 *
98decode_sattr3(__be32 *p, struct iattr *iap)
99{
100 u32 tmp;
101
102 iap->ia_valid = 0;
103
104 if (*p++) {
105 iap->ia_valid |= ATTR_MODE;
106 iap->ia_mode = ntohl(*p++);
107 }
108 if (*p++) {
109 iap->ia_uid = make_kuid(&init_user_ns, ntohl(*p++));
110 if (uid_valid(iap->ia_uid))
111 iap->ia_valid |= ATTR_UID;
112 }
113 if (*p++) {
114 iap->ia_gid = make_kgid(&init_user_ns, ntohl(*p++));
115 if (gid_valid(iap->ia_gid))
116 iap->ia_valid |= ATTR_GID;
117 }
118 if (*p++) {
119 u64 newsize;
120
121 iap->ia_valid |= ATTR_SIZE;
122 p = xdr_decode_hyper(p, &newsize);
123 if (newsize <= NFS_OFFSET_MAX)
124 iap->ia_size = newsize;
125 else
126 iap->ia_size = NFS_OFFSET_MAX;
127 }
128 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
129 iap->ia_valid |= ATTR_ATIME;
130 } else if (tmp == 2) { /* set to client time */
131 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
132 iap->ia_atime.tv_sec = ntohl(*p++);
133 iap->ia_atime.tv_nsec = ntohl(*p++);
134 }
135 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
136 iap->ia_valid |= ATTR_MTIME;
137 } else if (tmp == 2) { /* set to client time */
138 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
139 iap->ia_mtime.tv_sec = ntohl(*p++);
140 iap->ia_mtime.tv_nsec = ntohl(*p++);
141 }
142 return p;
143}
144
145static __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp)
146{
147 u64 f;
148 switch(fsid_source(fhp)) {
149 default:
150 case FSIDSOURCE_DEV:
151 p = xdr_encode_hyper(p, (u64)huge_encode_dev
152 (fhp->fh_dentry->d_inode->i_sb->s_dev));
153 break;
154 case FSIDSOURCE_FSID:
155 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
156 break;
157 case FSIDSOURCE_UUID:
158 f = ((u64*)fhp->fh_export->ex_uuid)[0];
159 f ^= ((u64*)fhp->fh_export->ex_uuid)[1];
160 p = xdr_encode_hyper(p, f);
161 break;
162 }
163 return p;
164}
165
166static __be32 *
167encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
168 struct kstat *stat)
169{
170 *p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
171 *p++ = htonl((u32) (stat->mode & S_IALLUGO));
172 *p++ = htonl((u32) stat->nlink);
173 *p++ = htonl((u32) from_kuid(&init_user_ns, stat->uid));
174 *p++ = htonl((u32) from_kgid(&init_user_ns, stat->gid));
175 if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) {
176 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
177 } else {
178 p = xdr_encode_hyper(p, (u64) stat->size);
179 }
180 p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9);
181 *p++ = htonl((u32) MAJOR(stat->rdev));
182 *p++ = htonl((u32) MINOR(stat->rdev));
183 p = encode_fsid(p, fhp);
184 p = xdr_encode_hyper(p, stat->ino);
185 p = encode_time3(p, &stat->atime);
186 p = encode_time3(p, &stat->mtime);
187 p = encode_time3(p, &stat->ctime);
188
189 return p;
190}
191
192static __be32 *
193encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
194{
195 /* Attributes to follow */
196 *p++ = xdr_one;
197 return encode_fattr3(rqstp, p, fhp, &fhp->fh_post_attr);
198}
199
200/*
201 * Encode post-operation attributes.
202 * The inode may be NULL if the call failed because of a stale file
203 * handle. In this case, no attributes are returned.
204 */
205static __be32 *
206encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
207{
208 struct dentry *dentry = fhp->fh_dentry;
209 if (dentry && dentry->d_inode) {
210 __be32 err;
211 struct kstat stat;
212
213 err = fh_getattr(fhp, &stat);
214 if (!err) {
215 *p++ = xdr_one; /* attributes follow */
216 lease_get_mtime(dentry->d_inode, &stat.mtime);
217 return encode_fattr3(rqstp, p, fhp, &stat);
218 }
219 }
220 *p++ = xdr_zero;
221 return p;
222}
223
224/* Helper for NFSv3 ACLs */
225__be32 *
226nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
227{
228 return encode_post_op_attr(rqstp, p, fhp);
229}
230
231/*
232 * Enocde weak cache consistency data
233 */
234static __be32 *
235encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
236{
237 struct dentry *dentry = fhp->fh_dentry;
238
239 if (dentry && dentry->d_inode && fhp->fh_post_saved) {
240 if (fhp->fh_pre_saved) {
241 *p++ = xdr_one;
242 p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size);
243 p = encode_time3(p, &fhp->fh_pre_mtime);
244 p = encode_time3(p, &fhp->fh_pre_ctime);
245 } else {
246 *p++ = xdr_zero;
247 }
248 return encode_saved_post_attr(rqstp, p, fhp);
249 }
250 /* no pre- or post-attrs */
251 *p++ = xdr_zero;
252 return encode_post_op_attr(rqstp, p, fhp);
253}
254
255/*
256 * Fill in the post_op attr for the wcc data
257 */
258void fill_post_wcc(struct svc_fh *fhp)
259{
260 __be32 err;
261
262 if (fhp->fh_post_saved)
263 printk("nfsd: inode locked twice during operation.\n");
264
265 err = fh_getattr(fhp, &fhp->fh_post_attr);
266 fhp->fh_post_change = fhp->fh_dentry->d_inode->i_version;
267 if (err) {
268 fhp->fh_post_saved = 0;
269 /* Grab the ctime anyway - set_change_info might use it */
270 fhp->fh_post_attr.ctime = fhp->fh_dentry->d_inode->i_ctime;
271 } else
272 fhp->fh_post_saved = 1;
273}
274
275/*
276 * XDR decode functions
277 */
278int
279nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args)
280{
281 if (!(p = decode_fh(p, &args->fh)))
282 return 0;
283 return xdr_argsize_check(rqstp, p);
284}
285
286int
287nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p,
288 struct nfsd3_sattrargs *args)
289{
290 if (!(p = decode_fh(p, &args->fh)))
291 return 0;
292 p = decode_sattr3(p, &args->attrs);
293
294 if ((args->check_guard = ntohl(*p++)) != 0) {
295 struct timespec time;
296 p = decode_time3(p, &time);
297 args->guardtime = time.tv_sec;
298 }
299
300 return xdr_argsize_check(rqstp, p);
301}
302
303int
304nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p,
305 struct nfsd3_diropargs *args)
306{
307 if (!(p = decode_fh(p, &args->fh))
308 || !(p = decode_filename(p, &args->name, &args->len)))
309 return 0;
310
311 return xdr_argsize_check(rqstp, p);
312}
313
314int
315nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p,
316 struct nfsd3_accessargs *args)
317{
318 if (!(p = decode_fh(p, &args->fh)))
319 return 0;
320 args->access = ntohl(*p++);
321
322 return xdr_argsize_check(rqstp, p);
323}
324
325int
326nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p,
327 struct nfsd3_readargs *args)
328{
329 unsigned int len;
330 int v;
331 u32 max_blocksize = svc_max_payload(rqstp);
332
333 if (!(p = decode_fh(p, &args->fh)))
334 return 0;
335 p = xdr_decode_hyper(p, &args->offset);
336
337 len = args->count = ntohl(*p++);
338
339 if (len > max_blocksize)
340 len = max_blocksize;
341
342 /* set up the kvec */
343 v=0;
344 while (len > 0) {
345 struct page *p = *(rqstp->rq_next_page++);
346
347 rqstp->rq_vec[v].iov_base = page_address(p);
348 rqstp->rq_vec[v].iov_len = len < PAGE_SIZE? len : PAGE_SIZE;
349 len -= rqstp->rq_vec[v].iov_len;
350 v++;
351 }
352 args->vlen = v;
353 return xdr_argsize_check(rqstp, p);
354}
355
356int
357nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p,
358 struct nfsd3_writeargs *args)
359{
360 unsigned int len, v, hdr, dlen;
361 u32 max_blocksize = svc_max_payload(rqstp);
362
363 if (!(p = decode_fh(p, &args->fh)))
364 return 0;
365 p = xdr_decode_hyper(p, &args->offset);
366
367 args->count = ntohl(*p++);
368 args->stable = ntohl(*p++);
369 len = args->len = ntohl(*p++);
370 /*
371 * The count must equal the amount of data passed.
372 */
373 if (args->count != args->len)
374 return 0;
375
376 /*
377 * Check to make sure that we got the right number of
378 * bytes.
379 */
380 hdr = (void*)p - rqstp->rq_arg.head[0].iov_base;
381 dlen = rqstp->rq_arg.head[0].iov_len + rqstp->rq_arg.page_len
382 - hdr;
383 /*
384 * Round the length of the data which was specified up to
385 * the next multiple of XDR units and then compare that
386 * against the length which was actually received.
387 * Note that when RPCSEC/GSS (for example) is used, the
388 * data buffer can be padded so dlen might be larger
389 * than required. It must never be smaller.
390 */
391 if (dlen < XDR_QUADLEN(len)*4)
392 return 0;
393
394 if (args->count > max_blocksize) {
395 args->count = max_blocksize;
396 len = args->len = max_blocksize;
397 }
398 rqstp->rq_vec[0].iov_base = (void*)p;
399 rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr;
400 v = 0;
401 while (len > rqstp->rq_vec[v].iov_len) {
402 len -= rqstp->rq_vec[v].iov_len;
403 v++;
404 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
405 rqstp->rq_vec[v].iov_len = PAGE_SIZE;
406 }
407 rqstp->rq_vec[v].iov_len = len;
408 args->vlen = v + 1;
409 return 1;
410}
411
412int
413nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p,
414 struct nfsd3_createargs *args)
415{
416 if (!(p = decode_fh(p, &args->fh))
417 || !(p = decode_filename(p, &args->name, &args->len)))
418 return 0;
419
420 switch (args->createmode = ntohl(*p++)) {
421 case NFS3_CREATE_UNCHECKED:
422 case NFS3_CREATE_GUARDED:
423 p = decode_sattr3(p, &args->attrs);
424 break;
425 case NFS3_CREATE_EXCLUSIVE:
426 args->verf = p;
427 p += 2;
428 break;
429 default:
430 return 0;
431 }
432
433 return xdr_argsize_check(rqstp, p);
434}
435int
436nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p,
437 struct nfsd3_createargs *args)
438{
439 if (!(p = decode_fh(p, &args->fh)) ||
440 !(p = decode_filename(p, &args->name, &args->len)))
441 return 0;
442 p = decode_sattr3(p, &args->attrs);
443
444 return xdr_argsize_check(rqstp, p);
445}
446
447int
448nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p,
449 struct nfsd3_symlinkargs *args)
450{
451 unsigned int len, avail;
452 char *old, *new;
453 struct kvec *vec;
454
455 if (!(p = decode_fh(p, &args->ffh)) ||
456 !(p = decode_filename(p, &args->fname, &args->flen))
457 )
458 return 0;
459 p = decode_sattr3(p, &args->attrs);
460
461 /* now decode the pathname, which might be larger than the first page.
462 * As we have to check for nul's anyway, we copy it into a new page
463 * This page appears in the rq_res.pages list, but as pages_len is always
464 * 0, it won't get in the way
465 */
466 len = ntohl(*p++);
467 if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE)
468 return 0;
469 args->tname = new = page_address(*(rqstp->rq_next_page++));
470 args->tlen = len;
471 /* first copy and check from the first page */
472 old = (char*)p;
473 vec = &rqstp->rq_arg.head[0];
474 avail = vec->iov_len - (old - (char*)vec->iov_base);
475 while (len && avail && *old) {
476 *new++ = *old++;
477 len--;
478 avail--;
479 }
480 /* now copy next page if there is one */
481 if (len && !avail && rqstp->rq_arg.page_len) {
482 avail = rqstp->rq_arg.page_len;
483 if (avail > PAGE_SIZE)
484 avail = PAGE_SIZE;
485 old = page_address(rqstp->rq_arg.pages[0]);
486 }
487 while (len && avail && *old) {
488 *new++ = *old++;
489 len--;
490 avail--;
491 }
492 *new = '\0';
493 if (len)
494 return 0;
495
496 return 1;
497}
498
499int
500nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p,
501 struct nfsd3_mknodargs *args)
502{
503 if (!(p = decode_fh(p, &args->fh))
504 || !(p = decode_filename(p, &args->name, &args->len)))
505 return 0;
506
507 args->ftype = ntohl(*p++);
508
509 if (args->ftype == NF3BLK || args->ftype == NF3CHR
510 || args->ftype == NF3SOCK || args->ftype == NF3FIFO)
511 p = decode_sattr3(p, &args->attrs);
512
513 if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
514 args->major = ntohl(*p++);
515 args->minor = ntohl(*p++);
516 }
517
518 return xdr_argsize_check(rqstp, p);
519}
520
521int
522nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p,
523 struct nfsd3_renameargs *args)
524{
525 if (!(p = decode_fh(p, &args->ffh))
526 || !(p = decode_filename(p, &args->fname, &args->flen))
527 || !(p = decode_fh(p, &args->tfh))
528 || !(p = decode_filename(p, &args->tname, &args->tlen)))
529 return 0;
530
531 return xdr_argsize_check(rqstp, p);
532}
533
534int
535nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p,
536 struct nfsd3_readlinkargs *args)
537{
538 if (!(p = decode_fh(p, &args->fh)))
539 return 0;
540 args->buffer = page_address(*(rqstp->rq_next_page++));
541
542 return xdr_argsize_check(rqstp, p);
543}
544
545int
546nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p,
547 struct nfsd3_linkargs *args)
548{
549 if (!(p = decode_fh(p, &args->ffh))
550 || !(p = decode_fh(p, &args->tfh))
551 || !(p = decode_filename(p, &args->tname, &args->tlen)))
552 return 0;
553
554 return xdr_argsize_check(rqstp, p);
555}
556
557int
558nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p,
559 struct nfsd3_readdirargs *args)
560{
561 if (!(p = decode_fh(p, &args->fh)))
562 return 0;
563 p = xdr_decode_hyper(p, &args->cookie);
564 args->verf = p; p += 2;
565 args->dircount = ~0;
566 args->count = ntohl(*p++);
567
568 if (args->count > PAGE_SIZE)
569 args->count = PAGE_SIZE;
570
571 args->buffer = page_address(*(rqstp->rq_next_page++));
572
573 return xdr_argsize_check(rqstp, p);
574}
575
576int
577nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p,
578 struct nfsd3_readdirargs *args)
579{
580 int len;
581 u32 max_blocksize = svc_max_payload(rqstp);
582
583 if (!(p = decode_fh(p, &args->fh)))
584 return 0;
585 p = xdr_decode_hyper(p, &args->cookie);
586 args->verf = p; p += 2;
587 args->dircount = ntohl(*p++);
588 args->count = ntohl(*p++);
589
590 len = (args->count > max_blocksize) ? max_blocksize :
591 args->count;
592 args->count = len;
593
594 while (len > 0) {
595 struct page *p = *(rqstp->rq_next_page++);
596 if (!args->buffer)
597 args->buffer = page_address(p);
598 len -= PAGE_SIZE;
599 }
600
601 return xdr_argsize_check(rqstp, p);
602}
603
604int
605nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p,
606 struct nfsd3_commitargs *args)
607{
608 if (!(p = decode_fh(p, &args->fh)))
609 return 0;
610 p = xdr_decode_hyper(p, &args->offset);
611 args->count = ntohl(*p++);
612
613 return xdr_argsize_check(rqstp, p);
614}
615
616/*
617 * XDR encode functions
618 */
619/*
620 * There must be an encoding function for void results so svc_process
621 * will work properly.
622 */
623int
624nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
625{
626 return xdr_ressize_check(rqstp, p);
627}
628
629/* GETATTR */
630int
631nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p,
632 struct nfsd3_attrstat *resp)
633{
634 if (resp->status == 0) {
635 lease_get_mtime(resp->fh.fh_dentry->d_inode,
636 &resp->stat.mtime);
637 p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat);
638 }
639 return xdr_ressize_check(rqstp, p);
640}
641
642/* SETATTR, REMOVE, RMDIR */
643int
644nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p,
645 struct nfsd3_attrstat *resp)
646{
647 p = encode_wcc_data(rqstp, p, &resp->fh);
648 return xdr_ressize_check(rqstp, p);
649}
650
651/* LOOKUP */
652int
653nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p,
654 struct nfsd3_diropres *resp)
655{
656 if (resp->status == 0) {
657 p = encode_fh(p, &resp->fh);
658 p = encode_post_op_attr(rqstp, p, &resp->fh);
659 }
660 p = encode_post_op_attr(rqstp, p, &resp->dirfh);
661 return xdr_ressize_check(rqstp, p);
662}
663
664/* ACCESS */
665int
666nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p,
667 struct nfsd3_accessres *resp)
668{
669 p = encode_post_op_attr(rqstp, p, &resp->fh);
670 if (resp->status == 0)
671 *p++ = htonl(resp->access);
672 return xdr_ressize_check(rqstp, p);
673}
674
675/* READLINK */
676int
677nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p,
678 struct nfsd3_readlinkres *resp)
679{
680 p = encode_post_op_attr(rqstp, p, &resp->fh);
681 if (resp->status == 0) {
682 *p++ = htonl(resp->len);
683 xdr_ressize_check(rqstp, p);
684 rqstp->rq_res.page_len = resp->len;
685 if (resp->len & 3) {
686 /* need to pad the tail */
687 rqstp->rq_res.tail[0].iov_base = p;
688 *p = 0;
689 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
690 }
691 return 1;
692 } else
693 return xdr_ressize_check(rqstp, p);
694}
695
696/* READ */
697int
698nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p,
699 struct nfsd3_readres *resp)
700{
701 p = encode_post_op_attr(rqstp, p, &resp->fh);
702 if (resp->status == 0) {
703 *p++ = htonl(resp->count);
704 *p++ = htonl(resp->eof);
705 *p++ = htonl(resp->count); /* xdr opaque count */
706 xdr_ressize_check(rqstp, p);
707 /* now update rqstp->rq_res to reflect data as well */
708 rqstp->rq_res.page_len = resp->count;
709 if (resp->count & 3) {
710 /* need to pad the tail */
711 rqstp->rq_res.tail[0].iov_base = p;
712 *p = 0;
713 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
714 }
715 return 1;
716 } else
717 return xdr_ressize_check(rqstp, p);
718}
719
720/* WRITE */
721int
722nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p,
723 struct nfsd3_writeres *resp)
724{
725 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
726
727 p = encode_wcc_data(rqstp, p, &resp->fh);
728 if (resp->status == 0) {
729 *p++ = htonl(resp->count);
730 *p++ = htonl(resp->committed);
731 *p++ = htonl(nn->nfssvc_boot.tv_sec);
732 *p++ = htonl(nn->nfssvc_boot.tv_usec);
733 }
734 return xdr_ressize_check(rqstp, p);
735}
736
737/* CREATE, MKDIR, SYMLINK, MKNOD */
738int
739nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p,
740 struct nfsd3_diropres *resp)
741{
742 if (resp->status == 0) {
743 *p++ = xdr_one;
744 p = encode_fh(p, &resp->fh);
745 p = encode_post_op_attr(rqstp, p, &resp->fh);
746 }
747 p = encode_wcc_data(rqstp, p, &resp->dirfh);
748 return xdr_ressize_check(rqstp, p);
749}
750
751/* RENAME */
752int
753nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p,
754 struct nfsd3_renameres *resp)
755{
756 p = encode_wcc_data(rqstp, p, &resp->ffh);
757 p = encode_wcc_data(rqstp, p, &resp->tfh);
758 return xdr_ressize_check(rqstp, p);
759}
760
761/* LINK */
762int
763nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p,
764 struct nfsd3_linkres *resp)
765{
766 p = encode_post_op_attr(rqstp, p, &resp->fh);
767 p = encode_wcc_data(rqstp, p, &resp->tfh);
768 return xdr_ressize_check(rqstp, p);
769}
770
771/* READDIR */
772int
773nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p,
774 struct nfsd3_readdirres *resp)
775{
776 p = encode_post_op_attr(rqstp, p, &resp->fh);
777
778 if (resp->status == 0) {
779 /* stupid readdir cookie */
780 memcpy(p, resp->verf, 8); p += 2;
781 xdr_ressize_check(rqstp, p);
782 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
783 return 1; /*No room for trailer */
784 rqstp->rq_res.page_len = (resp->count) << 2;
785
786 /* add the 'tail' to the end of the 'head' page - page 0. */
787 rqstp->rq_res.tail[0].iov_base = p;
788 *p++ = 0; /* no more entries */
789 *p++ = htonl(resp->common.err == nfserr_eof);
790 rqstp->rq_res.tail[0].iov_len = 2<<2;
791 return 1;
792 } else
793 return xdr_ressize_check(rqstp, p);
794}
795
796static __be32 *
797encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
798 int namlen, u64 ino)
799{
800 *p++ = xdr_one; /* mark entry present */
801 p = xdr_encode_hyper(p, ino); /* file id */
802 p = xdr_encode_array(p, name, namlen);/* name length & name */
803
804 cd->offset = p; /* remember pointer */
805 p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
806
807 return p;
808}
809
810static __be32
811compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
812 const char *name, int namlen)
813{
814 struct svc_export *exp;
815 struct dentry *dparent, *dchild;
816 __be32 rv = nfserr_noent;
817
818 dparent = cd->fh.fh_dentry;
819 exp = cd->fh.fh_export;
820
821 if (isdotent(name, namlen)) {
822 if (namlen == 2) {
823 dchild = dget_parent(dparent);
824 /* filesystem root - cannot return filehandle for ".." */
825 if (dchild == dparent)
826 goto out;
827 } else
828 dchild = dget(dparent);
829 } else
830 dchild = lookup_one_len(name, dparent, namlen);
831 if (IS_ERR(dchild))
832 return rv;
833 if (d_mountpoint(dchild))
834 goto out;
835 if (!dchild->d_inode)
836 goto out;
837 rv = fh_compose(fhp, exp, dchild, &cd->fh);
838out:
839 dput(dchild);
840 return rv;
841}
842
843static __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen)
844{
845 struct svc_fh *fh = &cd->scratch;
846 __be32 err;
847
848 fh_init(fh, NFS3_FHSIZE);
849 err = compose_entry_fh(cd, fh, name, namlen);
850 if (err) {
851 *p++ = 0;
852 *p++ = 0;
853 goto out;
854 }
855 p = encode_post_op_attr(cd->rqstp, p, fh);
856 *p++ = xdr_one; /* yes, a file handle follows */
857 p = encode_fh(p, fh);
858out:
859 fh_put(fh);
860 return p;
861}
862
863/*
864 * Encode a directory entry. This one works for both normal readdir
865 * and readdirplus.
866 * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
867 * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
868 *
869 * The readdirplus baggage is 1+21 words for post_op_attr, plus the
870 * file handle.
871 */
872
873#define NFS3_ENTRY_BAGGAGE (2 + 1 + 2 + 1)
874#define NFS3_ENTRYPLUS_BAGGAGE (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
875static int
876encode_entry(struct readdir_cd *ccd, const char *name, int namlen,
877 loff_t offset, u64 ino, unsigned int d_type, int plus)
878{
879 struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
880 common);
881 __be32 *p = cd->buffer;
882 caddr_t curr_page_addr = NULL;
883 struct page ** page;
884 int slen; /* string (name) length */
885 int elen; /* estimated entry length in words */
886 int num_entry_words = 0; /* actual number of words */
887
888 if (cd->offset) {
889 u64 offset64 = offset;
890
891 if (unlikely(cd->offset1)) {
892 /* we ended up with offset on a page boundary */
893 *cd->offset = htonl(offset64 >> 32);
894 *cd->offset1 = htonl(offset64 & 0xffffffff);
895 cd->offset1 = NULL;
896 } else {
897 xdr_encode_hyper(cd->offset, offset64);
898 }
899 }
900
901 /*
902 dprintk("encode_entry(%.*s @%ld%s)\n",
903 namlen, name, (long) offset, plus? " plus" : "");
904 */
905
906 /* truncate filename if too long */
907 if (namlen > NFS3_MAXNAMLEN)
908 namlen = NFS3_MAXNAMLEN;
909
910 slen = XDR_QUADLEN(namlen);
911 elen = slen + NFS3_ENTRY_BAGGAGE
912 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
913
914 if (cd->buflen < elen) {
915 cd->common.err = nfserr_toosmall;
916 return -EINVAL;
917 }
918
919 /* determine which page in rq_respages[] we are currently filling */
920 for (page = cd->rqstp->rq_respages + 1;
921 page < cd->rqstp->rq_next_page; page++) {
922 curr_page_addr = page_address(*page);
923
924 if (((caddr_t)cd->buffer >= curr_page_addr) &&
925 ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE))
926 break;
927 }
928
929 if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
930 /* encode entry in current page */
931
932 p = encode_entry_baggage(cd, p, name, namlen, ino);
933
934 if (plus)
935 p = encode_entryplus_baggage(cd, p, name, namlen);
936 num_entry_words = p - cd->buffer;
937 } else if (*(page+1) != NULL) {
938 /* temporarily encode entry into next page, then move back to
939 * current and next page in rq_respages[] */
940 __be32 *p1, *tmp;
941 int len1, len2;
942
943 /* grab next page for temporary storage of entry */
944 p1 = tmp = page_address(*(page+1));
945
946 p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
947
948 if (plus)
949 p1 = encode_entryplus_baggage(cd, p1, name, namlen);
950
951 /* determine entry word length and lengths to go in pages */
952 num_entry_words = p1 - tmp;
953 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
954 if ((num_entry_words << 2) < len1) {
955 /* the actual number of words in the entry is less
956 * than elen and can still fit in the current page
957 */
958 memmove(p, tmp, num_entry_words << 2);
959 p += num_entry_words;
960
961 /* update offset */
962 cd->offset = cd->buffer + (cd->offset - tmp);
963 } else {
964 unsigned int offset_r = (cd->offset - tmp) << 2;
965
966 /* update pointer to offset location.
967 * This is a 64bit quantity, so we need to
968 * deal with 3 cases:
969 * - entirely in first page
970 * - entirely in second page
971 * - 4 bytes in each page
972 */
973 if (offset_r + 8 <= len1) {
974 cd->offset = p + (cd->offset - tmp);
975 } else if (offset_r >= len1) {
976 cd->offset -= len1 >> 2;
977 } else {
978 /* sitting on the fence */
979 BUG_ON(offset_r != len1 - 4);
980 cd->offset = p + (cd->offset - tmp);
981 cd->offset1 = tmp;
982 }
983
984 len2 = (num_entry_words << 2) - len1;
985
986 /* move from temp page to current and next pages */
987 memmove(p, tmp, len1);
988 memmove(tmp, (caddr_t)tmp+len1, len2);
989
990 p = tmp + (len2 >> 2);
991 }
992 }
993 else {
994 cd->common.err = nfserr_toosmall;
995 return -EINVAL;
996 }
997
998 cd->buflen -= num_entry_words;
999 cd->buffer = p;
1000 cd->common.err = nfs_ok;
1001 return 0;
1002
1003}
1004
1005int
1006nfs3svc_encode_entry(void *cd, const char *name,
1007 int namlen, loff_t offset, u64 ino, unsigned int d_type)
1008{
1009 return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
1010}
1011
1012int
1013nfs3svc_encode_entry_plus(void *cd, const char *name,
1014 int namlen, loff_t offset, u64 ino,
1015 unsigned int d_type)
1016{
1017 return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
1018}
1019
1020/* FSSTAT */
1021int
1022nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p,
1023 struct nfsd3_fsstatres *resp)
1024{
1025 struct kstatfs *s = &resp->stats;
1026 u64 bs = s->f_bsize;
1027
1028 *p++ = xdr_zero; /* no post_op_attr */
1029
1030 if (resp->status == 0) {
1031 p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */
1032 p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */
1033 p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */
1034 p = xdr_encode_hyper(p, s->f_files); /* total inodes */
1035 p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */
1036 p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */
1037 *p++ = htonl(resp->invarsec); /* mean unchanged time */
1038 }
1039 return xdr_ressize_check(rqstp, p);
1040}
1041
1042/* FSINFO */
1043int
1044nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p,
1045 struct nfsd3_fsinfores *resp)
1046{
1047 *p++ = xdr_zero; /* no post_op_attr */
1048
1049 if (resp->status == 0) {
1050 *p++ = htonl(resp->f_rtmax);
1051 *p++ = htonl(resp->f_rtpref);
1052 *p++ = htonl(resp->f_rtmult);
1053 *p++ = htonl(resp->f_wtmax);
1054 *p++ = htonl(resp->f_wtpref);
1055 *p++ = htonl(resp->f_wtmult);
1056 *p++ = htonl(resp->f_dtpref);
1057 p = xdr_encode_hyper(p, resp->f_maxfilesize);
1058 *p++ = xdr_one;
1059 *p++ = xdr_zero;
1060 *p++ = htonl(resp->f_properties);
1061 }
1062
1063 return xdr_ressize_check(rqstp, p);
1064}
1065
1066/* PATHCONF */
1067int
1068nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p,
1069 struct nfsd3_pathconfres *resp)
1070{
1071 *p++ = xdr_zero; /* no post_op_attr */
1072
1073 if (resp->status == 0) {
1074 *p++ = htonl(resp->p_link_max);
1075 *p++ = htonl(resp->p_name_max);
1076 *p++ = htonl(resp->p_no_trunc);
1077 *p++ = htonl(resp->p_chown_restricted);
1078 *p++ = htonl(resp->p_case_insensitive);
1079 *p++ = htonl(resp->p_case_preserving);
1080 }
1081
1082 return xdr_ressize_check(rqstp, p);
1083}
1084
1085/* COMMIT */
1086int
1087nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p,
1088 struct nfsd3_commitres *resp)
1089{
1090 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1091
1092 p = encode_wcc_data(rqstp, p, &resp->fh);
1093 /* Write verifier */
1094 if (resp->status == 0) {
1095 *p++ = htonl(nn->nfssvc_boot.tv_sec);
1096 *p++ = htonl(nn->nfssvc_boot.tv_usec);
1097 }
1098 return xdr_ressize_check(rqstp, p);
1099}
1100
1101/*
1102 * XDR release functions
1103 */
1104int
1105nfs3svc_release_fhandle(struct svc_rqst *rqstp, __be32 *p,
1106 struct nfsd3_attrstat *resp)
1107{
1108 fh_put(&resp->fh);
1109 return 1;
1110}
1111
1112int
1113nfs3svc_release_fhandle2(struct svc_rqst *rqstp, __be32 *p,
1114 struct nfsd3_fhandle_pair *resp)
1115{
1116 fh_put(&resp->fh1);
1117 fh_put(&resp->fh2);
1118 return 1;
1119}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * XDR support for nfsd/protocol version 3.
4 *
5 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
6 *
7 * 2003-08-09 Jamie Lokier: Use htonl() for nanoseconds, not htons()!
8 */
9
10#include <linux/namei.h>
11#include <linux/sunrpc/svc_xprt.h>
12#include "xdr3.h"
13#include "auth.h"
14#include "netns.h"
15#include "vfs.h"
16
17#define NFSDDBG_FACILITY NFSDDBG_XDR
18
19
20/*
21 * Mapping of S_IF* types to NFS file types
22 */
23static u32 nfs3_ftypes[] = {
24 NF3NON, NF3FIFO, NF3CHR, NF3BAD,
25 NF3DIR, NF3BAD, NF3BLK, NF3BAD,
26 NF3REG, NF3BAD, NF3LNK, NF3BAD,
27 NF3SOCK, NF3BAD, NF3LNK, NF3BAD,
28};
29
30/*
31 * XDR functions for basic NFS types
32 */
33static __be32 *
34encode_time3(__be32 *p, struct timespec *time)
35{
36 *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);
37 return p;
38}
39
40static __be32 *
41decode_time3(__be32 *p, struct timespec *time)
42{
43 time->tv_sec = ntohl(*p++);
44 time->tv_nsec = ntohl(*p++);
45 return p;
46}
47
48static __be32 *
49decode_fh(__be32 *p, struct svc_fh *fhp)
50{
51 unsigned int size;
52 fh_init(fhp, NFS3_FHSIZE);
53 size = ntohl(*p++);
54 if (size > NFS3_FHSIZE)
55 return NULL;
56
57 memcpy(&fhp->fh_handle.fh_base, p, size);
58 fhp->fh_handle.fh_size = size;
59 return p + XDR_QUADLEN(size);
60}
61
62/* Helper function for NFSv3 ACL code */
63__be32 *nfs3svc_decode_fh(__be32 *p, struct svc_fh *fhp)
64{
65 return decode_fh(p, fhp);
66}
67
68static __be32 *
69encode_fh(__be32 *p, struct svc_fh *fhp)
70{
71 unsigned int size = fhp->fh_handle.fh_size;
72 *p++ = htonl(size);
73 if (size) p[XDR_QUADLEN(size)-1]=0;
74 memcpy(p, &fhp->fh_handle.fh_base, size);
75 return p + XDR_QUADLEN(size);
76}
77
78/*
79 * Decode a file name and make sure that the path contains
80 * no slashes or null bytes.
81 */
82static __be32 *
83decode_filename(__be32 *p, char **namp, unsigned int *lenp)
84{
85 char *name;
86 unsigned int i;
87
88 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) {
89 for (i = 0, name = *namp; i < *lenp; i++, name++) {
90 if (*name == '\0' || *name == '/')
91 return NULL;
92 }
93 }
94
95 return p;
96}
97
98static __be32 *
99decode_sattr3(__be32 *p, struct iattr *iap)
100{
101 u32 tmp;
102
103 iap->ia_valid = 0;
104
105 if (*p++) {
106 iap->ia_valid |= ATTR_MODE;
107 iap->ia_mode = ntohl(*p++);
108 }
109 if (*p++) {
110 iap->ia_uid = make_kuid(&init_user_ns, ntohl(*p++));
111 if (uid_valid(iap->ia_uid))
112 iap->ia_valid |= ATTR_UID;
113 }
114 if (*p++) {
115 iap->ia_gid = make_kgid(&init_user_ns, ntohl(*p++));
116 if (gid_valid(iap->ia_gid))
117 iap->ia_valid |= ATTR_GID;
118 }
119 if (*p++) {
120 u64 newsize;
121
122 iap->ia_valid |= ATTR_SIZE;
123 p = xdr_decode_hyper(p, &newsize);
124 iap->ia_size = min_t(u64, newsize, NFS_OFFSET_MAX);
125 }
126 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
127 iap->ia_valid |= ATTR_ATIME;
128 } else if (tmp == 2) { /* set to client time */
129 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
130 iap->ia_atime.tv_sec = ntohl(*p++);
131 iap->ia_atime.tv_nsec = ntohl(*p++);
132 }
133 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
134 iap->ia_valid |= ATTR_MTIME;
135 } else if (tmp == 2) { /* set to client time */
136 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
137 iap->ia_mtime.tv_sec = ntohl(*p++);
138 iap->ia_mtime.tv_nsec = ntohl(*p++);
139 }
140 return p;
141}
142
143static __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp)
144{
145 u64 f;
146 switch(fsid_source(fhp)) {
147 default:
148 case FSIDSOURCE_DEV:
149 p = xdr_encode_hyper(p, (u64)huge_encode_dev
150 (fhp->fh_dentry->d_sb->s_dev));
151 break;
152 case FSIDSOURCE_FSID:
153 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
154 break;
155 case FSIDSOURCE_UUID:
156 f = ((u64*)fhp->fh_export->ex_uuid)[0];
157 f ^= ((u64*)fhp->fh_export->ex_uuid)[1];
158 p = xdr_encode_hyper(p, f);
159 break;
160 }
161 return p;
162}
163
164static __be32 *
165encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
166 struct kstat *stat)
167{
168 *p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
169 *p++ = htonl((u32) (stat->mode & S_IALLUGO));
170 *p++ = htonl((u32) stat->nlink);
171 *p++ = htonl((u32) from_kuid(&init_user_ns, stat->uid));
172 *p++ = htonl((u32) from_kgid(&init_user_ns, stat->gid));
173 if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) {
174 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
175 } else {
176 p = xdr_encode_hyper(p, (u64) stat->size);
177 }
178 p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9);
179 *p++ = htonl((u32) MAJOR(stat->rdev));
180 *p++ = htonl((u32) MINOR(stat->rdev));
181 p = encode_fsid(p, fhp);
182 p = xdr_encode_hyper(p, stat->ino);
183 p = encode_time3(p, &stat->atime);
184 p = encode_time3(p, &stat->mtime);
185 p = encode_time3(p, &stat->ctime);
186
187 return p;
188}
189
190static __be32 *
191encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
192{
193 /* Attributes to follow */
194 *p++ = xdr_one;
195 return encode_fattr3(rqstp, p, fhp, &fhp->fh_post_attr);
196}
197
198/*
199 * Encode post-operation attributes.
200 * The inode may be NULL if the call failed because of a stale file
201 * handle. In this case, no attributes are returned.
202 */
203static __be32 *
204encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
205{
206 struct dentry *dentry = fhp->fh_dentry;
207 if (dentry && d_really_is_positive(dentry)) {
208 __be32 err;
209 struct kstat stat;
210
211 err = fh_getattr(fhp, &stat);
212 if (!err) {
213 *p++ = xdr_one; /* attributes follow */
214 lease_get_mtime(d_inode(dentry), &stat.mtime);
215 return encode_fattr3(rqstp, p, fhp, &stat);
216 }
217 }
218 *p++ = xdr_zero;
219 return p;
220}
221
222/* Helper for NFSv3 ACLs */
223__be32 *
224nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
225{
226 return encode_post_op_attr(rqstp, p, fhp);
227}
228
229/*
230 * Enocde weak cache consistency data
231 */
232static __be32 *
233encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
234{
235 struct dentry *dentry = fhp->fh_dentry;
236
237 if (dentry && d_really_is_positive(dentry) && fhp->fh_post_saved) {
238 if (fhp->fh_pre_saved) {
239 *p++ = xdr_one;
240 p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size);
241 p = encode_time3(p, &fhp->fh_pre_mtime);
242 p = encode_time3(p, &fhp->fh_pre_ctime);
243 } else {
244 *p++ = xdr_zero;
245 }
246 return encode_saved_post_attr(rqstp, p, fhp);
247 }
248 /* no pre- or post-attrs */
249 *p++ = xdr_zero;
250 return encode_post_op_attr(rqstp, p, fhp);
251}
252
253/*
254 * Fill in the pre_op attr for the wcc data
255 */
256void fill_pre_wcc(struct svc_fh *fhp)
257{
258 struct inode *inode;
259 struct kstat stat;
260 __be32 err;
261
262 if (fhp->fh_pre_saved)
263 return;
264
265 inode = d_inode(fhp->fh_dentry);
266 err = fh_getattr(fhp, &stat);
267 if (err) {
268 /* Grab the times from inode anyway */
269 stat.mtime = inode->i_mtime;
270 stat.ctime = inode->i_ctime;
271 stat.size = inode->i_size;
272 }
273
274 fhp->fh_pre_mtime = stat.mtime;
275 fhp->fh_pre_ctime = stat.ctime;
276 fhp->fh_pre_size = stat.size;
277 fhp->fh_pre_change = nfsd4_change_attribute(&stat, inode);
278 fhp->fh_pre_saved = true;
279}
280
281/*
282 * Fill in the post_op attr for the wcc data
283 */
284void fill_post_wcc(struct svc_fh *fhp)
285{
286 __be32 err;
287
288 if (fhp->fh_post_saved)
289 printk("nfsd: inode locked twice during operation.\n");
290
291 err = fh_getattr(fhp, &fhp->fh_post_attr);
292 fhp->fh_post_change = nfsd4_change_attribute(&fhp->fh_post_attr,
293 d_inode(fhp->fh_dentry));
294 if (err) {
295 fhp->fh_post_saved = false;
296 /* Grab the ctime anyway - set_change_info might use it */
297 fhp->fh_post_attr.ctime = d_inode(fhp->fh_dentry)->i_ctime;
298 } else
299 fhp->fh_post_saved = true;
300}
301
302/*
303 * XDR decode functions
304 */
305int
306nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p)
307{
308 struct nfsd_fhandle *args = rqstp->rq_argp;
309
310 p = decode_fh(p, &args->fh);
311 if (!p)
312 return 0;
313 return xdr_argsize_check(rqstp, p);
314}
315
316int
317nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p)
318{
319 struct nfsd3_sattrargs *args = rqstp->rq_argp;
320
321 p = decode_fh(p, &args->fh);
322 if (!p)
323 return 0;
324 p = decode_sattr3(p, &args->attrs);
325
326 if ((args->check_guard = ntohl(*p++)) != 0) {
327 struct timespec time;
328 p = decode_time3(p, &time);
329 args->guardtime = time.tv_sec;
330 }
331
332 return xdr_argsize_check(rqstp, p);
333}
334
335int
336nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p)
337{
338 struct nfsd3_diropargs *args = rqstp->rq_argp;
339
340 if (!(p = decode_fh(p, &args->fh))
341 || !(p = decode_filename(p, &args->name, &args->len)))
342 return 0;
343
344 return xdr_argsize_check(rqstp, p);
345}
346
347int
348nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p)
349{
350 struct nfsd3_accessargs *args = rqstp->rq_argp;
351
352 p = decode_fh(p, &args->fh);
353 if (!p)
354 return 0;
355 args->access = ntohl(*p++);
356
357 return xdr_argsize_check(rqstp, p);
358}
359
360int
361nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p)
362{
363 struct nfsd3_readargs *args = rqstp->rq_argp;
364 unsigned int len;
365 int v;
366 u32 max_blocksize = svc_max_payload(rqstp);
367
368 p = decode_fh(p, &args->fh);
369 if (!p)
370 return 0;
371 p = xdr_decode_hyper(p, &args->offset);
372
373 args->count = ntohl(*p++);
374 len = min(args->count, max_blocksize);
375
376 /* set up the kvec */
377 v=0;
378 while (len > 0) {
379 struct page *p = *(rqstp->rq_next_page++);
380
381 rqstp->rq_vec[v].iov_base = page_address(p);
382 rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
383 len -= rqstp->rq_vec[v].iov_len;
384 v++;
385 }
386 args->vlen = v;
387 return xdr_argsize_check(rqstp, p);
388}
389
390int
391nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p)
392{
393 struct nfsd3_writeargs *args = rqstp->rq_argp;
394 unsigned int len, hdr, dlen;
395 u32 max_blocksize = svc_max_payload(rqstp);
396 struct kvec *head = rqstp->rq_arg.head;
397 struct kvec *tail = rqstp->rq_arg.tail;
398
399 p = decode_fh(p, &args->fh);
400 if (!p)
401 return 0;
402 p = xdr_decode_hyper(p, &args->offset);
403
404 args->count = ntohl(*p++);
405 args->stable = ntohl(*p++);
406 len = args->len = ntohl(*p++);
407 if ((void *)p > head->iov_base + head->iov_len)
408 return 0;
409 /*
410 * The count must equal the amount of data passed.
411 */
412 if (args->count != args->len)
413 return 0;
414
415 /*
416 * Check to make sure that we got the right number of
417 * bytes.
418 */
419 hdr = (void*)p - head->iov_base;
420 dlen = head->iov_len + rqstp->rq_arg.page_len + tail->iov_len - hdr;
421 /*
422 * Round the length of the data which was specified up to
423 * the next multiple of XDR units and then compare that
424 * against the length which was actually received.
425 * Note that when RPCSEC/GSS (for example) is used, the
426 * data buffer can be padded so dlen might be larger
427 * than required. It must never be smaller.
428 */
429 if (dlen < XDR_QUADLEN(len)*4)
430 return 0;
431
432 if (args->count > max_blocksize) {
433 args->count = max_blocksize;
434 len = args->len = max_blocksize;
435 }
436
437 args->first.iov_base = (void *)p;
438 args->first.iov_len = head->iov_len - hdr;
439 return 1;
440}
441
442int
443nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p)
444{
445 struct nfsd3_createargs *args = rqstp->rq_argp;
446
447 if (!(p = decode_fh(p, &args->fh))
448 || !(p = decode_filename(p, &args->name, &args->len)))
449 return 0;
450
451 switch (args->createmode = ntohl(*p++)) {
452 case NFS3_CREATE_UNCHECKED:
453 case NFS3_CREATE_GUARDED:
454 p = decode_sattr3(p, &args->attrs);
455 break;
456 case NFS3_CREATE_EXCLUSIVE:
457 args->verf = p;
458 p += 2;
459 break;
460 default:
461 return 0;
462 }
463
464 return xdr_argsize_check(rqstp, p);
465}
466
467int
468nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p)
469{
470 struct nfsd3_createargs *args = rqstp->rq_argp;
471
472 if (!(p = decode_fh(p, &args->fh)) ||
473 !(p = decode_filename(p, &args->name, &args->len)))
474 return 0;
475 p = decode_sattr3(p, &args->attrs);
476
477 return xdr_argsize_check(rqstp, p);
478}
479
480int
481nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p)
482{
483 struct nfsd3_symlinkargs *args = rqstp->rq_argp;
484 char *base = (char *)p;
485 size_t dlen;
486
487 if (!(p = decode_fh(p, &args->ffh)) ||
488 !(p = decode_filename(p, &args->fname, &args->flen)))
489 return 0;
490 p = decode_sattr3(p, &args->attrs);
491
492 args->tlen = ntohl(*p++);
493
494 args->first.iov_base = p;
495 args->first.iov_len = rqstp->rq_arg.head[0].iov_len;
496 args->first.iov_len -= (char *)p - base;
497
498 dlen = args->first.iov_len + rqstp->rq_arg.page_len +
499 rqstp->rq_arg.tail[0].iov_len;
500 if (dlen < XDR_QUADLEN(args->tlen) << 2)
501 return 0;
502 return 1;
503}
504
505int
506nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p)
507{
508 struct nfsd3_mknodargs *args = rqstp->rq_argp;
509
510 if (!(p = decode_fh(p, &args->fh))
511 || !(p = decode_filename(p, &args->name, &args->len)))
512 return 0;
513
514 args->ftype = ntohl(*p++);
515
516 if (args->ftype == NF3BLK || args->ftype == NF3CHR
517 || args->ftype == NF3SOCK || args->ftype == NF3FIFO)
518 p = decode_sattr3(p, &args->attrs);
519
520 if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
521 args->major = ntohl(*p++);
522 args->minor = ntohl(*p++);
523 }
524
525 return xdr_argsize_check(rqstp, p);
526}
527
528int
529nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p)
530{
531 struct nfsd3_renameargs *args = rqstp->rq_argp;
532
533 if (!(p = decode_fh(p, &args->ffh))
534 || !(p = decode_filename(p, &args->fname, &args->flen))
535 || !(p = decode_fh(p, &args->tfh))
536 || !(p = decode_filename(p, &args->tname, &args->tlen)))
537 return 0;
538
539 return xdr_argsize_check(rqstp, p);
540}
541
542int
543nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p)
544{
545 struct nfsd3_readlinkargs *args = rqstp->rq_argp;
546
547 p = decode_fh(p, &args->fh);
548 if (!p)
549 return 0;
550 args->buffer = page_address(*(rqstp->rq_next_page++));
551
552 return xdr_argsize_check(rqstp, p);
553}
554
555int
556nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p)
557{
558 struct nfsd3_linkargs *args = rqstp->rq_argp;
559
560 if (!(p = decode_fh(p, &args->ffh))
561 || !(p = decode_fh(p, &args->tfh))
562 || !(p = decode_filename(p, &args->tname, &args->tlen)))
563 return 0;
564
565 return xdr_argsize_check(rqstp, p);
566}
567
568int
569nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p)
570{
571 struct nfsd3_readdirargs *args = rqstp->rq_argp;
572 p = decode_fh(p, &args->fh);
573 if (!p)
574 return 0;
575 p = xdr_decode_hyper(p, &args->cookie);
576 args->verf = p; p += 2;
577 args->dircount = ~0;
578 args->count = ntohl(*p++);
579 args->count = min_t(u32, args->count, PAGE_SIZE);
580 args->buffer = page_address(*(rqstp->rq_next_page++));
581
582 return xdr_argsize_check(rqstp, p);
583}
584
585int
586nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p)
587{
588 struct nfsd3_readdirargs *args = rqstp->rq_argp;
589 int len;
590 u32 max_blocksize = svc_max_payload(rqstp);
591
592 p = decode_fh(p, &args->fh);
593 if (!p)
594 return 0;
595 p = xdr_decode_hyper(p, &args->cookie);
596 args->verf = p; p += 2;
597 args->dircount = ntohl(*p++);
598 args->count = ntohl(*p++);
599
600 len = args->count = min(args->count, max_blocksize);
601 while (len > 0) {
602 struct page *p = *(rqstp->rq_next_page++);
603 if (!args->buffer)
604 args->buffer = page_address(p);
605 len -= PAGE_SIZE;
606 }
607
608 return xdr_argsize_check(rqstp, p);
609}
610
611int
612nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p)
613{
614 struct nfsd3_commitargs *args = rqstp->rq_argp;
615 p = decode_fh(p, &args->fh);
616 if (!p)
617 return 0;
618 p = xdr_decode_hyper(p, &args->offset);
619 args->count = ntohl(*p++);
620
621 return xdr_argsize_check(rqstp, p);
622}
623
624/*
625 * XDR encode functions
626 */
627/*
628 * There must be an encoding function for void results so svc_process
629 * will work properly.
630 */
631int
632nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
633{
634 return xdr_ressize_check(rqstp, p);
635}
636
637/* GETATTR */
638int
639nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p)
640{
641 struct nfsd3_attrstat *resp = rqstp->rq_resp;
642
643 if (resp->status == 0) {
644 lease_get_mtime(d_inode(resp->fh.fh_dentry),
645 &resp->stat.mtime);
646 p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat);
647 }
648 return xdr_ressize_check(rqstp, p);
649}
650
651/* SETATTR, REMOVE, RMDIR */
652int
653nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p)
654{
655 struct nfsd3_attrstat *resp = rqstp->rq_resp;
656
657 p = encode_wcc_data(rqstp, p, &resp->fh);
658 return xdr_ressize_check(rqstp, p);
659}
660
661/* LOOKUP */
662int
663nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p)
664{
665 struct nfsd3_diropres *resp = rqstp->rq_resp;
666
667 if (resp->status == 0) {
668 p = encode_fh(p, &resp->fh);
669 p = encode_post_op_attr(rqstp, p, &resp->fh);
670 }
671 p = encode_post_op_attr(rqstp, p, &resp->dirfh);
672 return xdr_ressize_check(rqstp, p);
673}
674
675/* ACCESS */
676int
677nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p)
678{
679 struct nfsd3_accessres *resp = rqstp->rq_resp;
680
681 p = encode_post_op_attr(rqstp, p, &resp->fh);
682 if (resp->status == 0)
683 *p++ = htonl(resp->access);
684 return xdr_ressize_check(rqstp, p);
685}
686
687/* READLINK */
688int
689nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p)
690{
691 struct nfsd3_readlinkres *resp = rqstp->rq_resp;
692
693 p = encode_post_op_attr(rqstp, p, &resp->fh);
694 if (resp->status == 0) {
695 *p++ = htonl(resp->len);
696 xdr_ressize_check(rqstp, p);
697 rqstp->rq_res.page_len = resp->len;
698 if (resp->len & 3) {
699 /* need to pad the tail */
700 rqstp->rq_res.tail[0].iov_base = p;
701 *p = 0;
702 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
703 }
704 return 1;
705 } else
706 return xdr_ressize_check(rqstp, p);
707}
708
709/* READ */
710int
711nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p)
712{
713 struct nfsd3_readres *resp = rqstp->rq_resp;
714
715 p = encode_post_op_attr(rqstp, p, &resp->fh);
716 if (resp->status == 0) {
717 *p++ = htonl(resp->count);
718 *p++ = htonl(resp->eof);
719 *p++ = htonl(resp->count); /* xdr opaque count */
720 xdr_ressize_check(rqstp, p);
721 /* now update rqstp->rq_res to reflect data as well */
722 rqstp->rq_res.page_len = resp->count;
723 if (resp->count & 3) {
724 /* need to pad the tail */
725 rqstp->rq_res.tail[0].iov_base = p;
726 *p = 0;
727 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
728 }
729 return 1;
730 } else
731 return xdr_ressize_check(rqstp, p);
732}
733
734/* WRITE */
735int
736nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p)
737{
738 struct nfsd3_writeres *resp = rqstp->rq_resp;
739 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
740
741 p = encode_wcc_data(rqstp, p, &resp->fh);
742 if (resp->status == 0) {
743 *p++ = htonl(resp->count);
744 *p++ = htonl(resp->committed);
745 /* unique identifier, y2038 overflow can be ignored */
746 *p++ = htonl((u32)nn->nfssvc_boot.tv_sec);
747 *p++ = htonl(nn->nfssvc_boot.tv_nsec);
748 }
749 return xdr_ressize_check(rqstp, p);
750}
751
752/* CREATE, MKDIR, SYMLINK, MKNOD */
753int
754nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p)
755{
756 struct nfsd3_diropres *resp = rqstp->rq_resp;
757
758 if (resp->status == 0) {
759 *p++ = xdr_one;
760 p = encode_fh(p, &resp->fh);
761 p = encode_post_op_attr(rqstp, p, &resp->fh);
762 }
763 p = encode_wcc_data(rqstp, p, &resp->dirfh);
764 return xdr_ressize_check(rqstp, p);
765}
766
767/* RENAME */
768int
769nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p)
770{
771 struct nfsd3_renameres *resp = rqstp->rq_resp;
772
773 p = encode_wcc_data(rqstp, p, &resp->ffh);
774 p = encode_wcc_data(rqstp, p, &resp->tfh);
775 return xdr_ressize_check(rqstp, p);
776}
777
778/* LINK */
779int
780nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p)
781{
782 struct nfsd3_linkres *resp = rqstp->rq_resp;
783
784 p = encode_post_op_attr(rqstp, p, &resp->fh);
785 p = encode_wcc_data(rqstp, p, &resp->tfh);
786 return xdr_ressize_check(rqstp, p);
787}
788
789/* READDIR */
790int
791nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p)
792{
793 struct nfsd3_readdirres *resp = rqstp->rq_resp;
794
795 p = encode_post_op_attr(rqstp, p, &resp->fh);
796
797 if (resp->status == 0) {
798 /* stupid readdir cookie */
799 memcpy(p, resp->verf, 8); p += 2;
800 xdr_ressize_check(rqstp, p);
801 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
802 return 1; /*No room for trailer */
803 rqstp->rq_res.page_len = (resp->count) << 2;
804
805 /* add the 'tail' to the end of the 'head' page - page 0. */
806 rqstp->rq_res.tail[0].iov_base = p;
807 *p++ = 0; /* no more entries */
808 *p++ = htonl(resp->common.err == nfserr_eof);
809 rqstp->rq_res.tail[0].iov_len = 2<<2;
810 return 1;
811 } else
812 return xdr_ressize_check(rqstp, p);
813}
814
815static __be32 *
816encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
817 int namlen, u64 ino)
818{
819 *p++ = xdr_one; /* mark entry present */
820 p = xdr_encode_hyper(p, ino); /* file id */
821 p = xdr_encode_array(p, name, namlen);/* name length & name */
822
823 cd->offset = p; /* remember pointer */
824 p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
825
826 return p;
827}
828
829static __be32
830compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
831 const char *name, int namlen, u64 ino)
832{
833 struct svc_export *exp;
834 struct dentry *dparent, *dchild;
835 __be32 rv = nfserr_noent;
836
837 dparent = cd->fh.fh_dentry;
838 exp = cd->fh.fh_export;
839
840 if (isdotent(name, namlen)) {
841 if (namlen == 2) {
842 dchild = dget_parent(dparent);
843 /* filesystem root - cannot return filehandle for ".." */
844 if (dchild == dparent)
845 goto out;
846 } else
847 dchild = dget(dparent);
848 } else
849 dchild = lookup_one_len_unlocked(name, dparent, namlen);
850 if (IS_ERR(dchild))
851 return rv;
852 if (d_mountpoint(dchild))
853 goto out;
854 if (d_really_is_negative(dchild))
855 goto out;
856 if (dchild->d_inode->i_ino != ino)
857 goto out;
858 rv = fh_compose(fhp, exp, dchild, &cd->fh);
859out:
860 dput(dchild);
861 return rv;
862}
863
864static __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen, u64 ino)
865{
866 struct svc_fh *fh = &cd->scratch;
867 __be32 err;
868
869 fh_init(fh, NFS3_FHSIZE);
870 err = compose_entry_fh(cd, fh, name, namlen, ino);
871 if (err) {
872 *p++ = 0;
873 *p++ = 0;
874 goto out;
875 }
876 p = encode_post_op_attr(cd->rqstp, p, fh);
877 *p++ = xdr_one; /* yes, a file handle follows */
878 p = encode_fh(p, fh);
879out:
880 fh_put(fh);
881 return p;
882}
883
884/*
885 * Encode a directory entry. This one works for both normal readdir
886 * and readdirplus.
887 * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
888 * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
889 *
890 * The readdirplus baggage is 1+21 words for post_op_attr, plus the
891 * file handle.
892 */
893
894#define NFS3_ENTRY_BAGGAGE (2 + 1 + 2 + 1)
895#define NFS3_ENTRYPLUS_BAGGAGE (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
896static int
897encode_entry(struct readdir_cd *ccd, const char *name, int namlen,
898 loff_t offset, u64 ino, unsigned int d_type, int plus)
899{
900 struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
901 common);
902 __be32 *p = cd->buffer;
903 caddr_t curr_page_addr = NULL;
904 struct page ** page;
905 int slen; /* string (name) length */
906 int elen; /* estimated entry length in words */
907 int num_entry_words = 0; /* actual number of words */
908
909 if (cd->offset) {
910 u64 offset64 = offset;
911
912 if (unlikely(cd->offset1)) {
913 /* we ended up with offset on a page boundary */
914 *cd->offset = htonl(offset64 >> 32);
915 *cd->offset1 = htonl(offset64 & 0xffffffff);
916 cd->offset1 = NULL;
917 } else {
918 xdr_encode_hyper(cd->offset, offset64);
919 }
920 }
921
922 /*
923 dprintk("encode_entry(%.*s @%ld%s)\n",
924 namlen, name, (long) offset, plus? " plus" : "");
925 */
926
927 /* truncate filename if too long */
928 namlen = min(namlen, NFS3_MAXNAMLEN);
929
930 slen = XDR_QUADLEN(namlen);
931 elen = slen + NFS3_ENTRY_BAGGAGE
932 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
933
934 if (cd->buflen < elen) {
935 cd->common.err = nfserr_toosmall;
936 return -EINVAL;
937 }
938
939 /* determine which page in rq_respages[] we are currently filling */
940 for (page = cd->rqstp->rq_respages + 1;
941 page < cd->rqstp->rq_next_page; page++) {
942 curr_page_addr = page_address(*page);
943
944 if (((caddr_t)cd->buffer >= curr_page_addr) &&
945 ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE))
946 break;
947 }
948
949 if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
950 /* encode entry in current page */
951
952 p = encode_entry_baggage(cd, p, name, namlen, ino);
953
954 if (plus)
955 p = encode_entryplus_baggage(cd, p, name, namlen, ino);
956 num_entry_words = p - cd->buffer;
957 } else if (*(page+1) != NULL) {
958 /* temporarily encode entry into next page, then move back to
959 * current and next page in rq_respages[] */
960 __be32 *p1, *tmp;
961 int len1, len2;
962
963 /* grab next page for temporary storage of entry */
964 p1 = tmp = page_address(*(page+1));
965
966 p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
967
968 if (plus)
969 p1 = encode_entryplus_baggage(cd, p1, name, namlen, ino);
970
971 /* determine entry word length and lengths to go in pages */
972 num_entry_words = p1 - tmp;
973 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
974 if ((num_entry_words << 2) < len1) {
975 /* the actual number of words in the entry is less
976 * than elen and can still fit in the current page
977 */
978 memmove(p, tmp, num_entry_words << 2);
979 p += num_entry_words;
980
981 /* update offset */
982 cd->offset = cd->buffer + (cd->offset - tmp);
983 } else {
984 unsigned int offset_r = (cd->offset - tmp) << 2;
985
986 /* update pointer to offset location.
987 * This is a 64bit quantity, so we need to
988 * deal with 3 cases:
989 * - entirely in first page
990 * - entirely in second page
991 * - 4 bytes in each page
992 */
993 if (offset_r + 8 <= len1) {
994 cd->offset = p + (cd->offset - tmp);
995 } else if (offset_r >= len1) {
996 cd->offset -= len1 >> 2;
997 } else {
998 /* sitting on the fence */
999 BUG_ON(offset_r != len1 - 4);
1000 cd->offset = p + (cd->offset - tmp);
1001 cd->offset1 = tmp;
1002 }
1003
1004 len2 = (num_entry_words << 2) - len1;
1005
1006 /* move from temp page to current and next pages */
1007 memmove(p, tmp, len1);
1008 memmove(tmp, (caddr_t)tmp+len1, len2);
1009
1010 p = tmp + (len2 >> 2);
1011 }
1012 }
1013 else {
1014 cd->common.err = nfserr_toosmall;
1015 return -EINVAL;
1016 }
1017
1018 cd->buflen -= num_entry_words;
1019 cd->buffer = p;
1020 cd->common.err = nfs_ok;
1021 return 0;
1022
1023}
1024
1025int
1026nfs3svc_encode_entry(void *cd, const char *name,
1027 int namlen, loff_t offset, u64 ino, unsigned int d_type)
1028{
1029 return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
1030}
1031
1032int
1033nfs3svc_encode_entry_plus(void *cd, const char *name,
1034 int namlen, loff_t offset, u64 ino,
1035 unsigned int d_type)
1036{
1037 return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
1038}
1039
1040/* FSSTAT */
1041int
1042nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p)
1043{
1044 struct nfsd3_fsstatres *resp = rqstp->rq_resp;
1045 struct kstatfs *s = &resp->stats;
1046 u64 bs = s->f_bsize;
1047
1048 *p++ = xdr_zero; /* no post_op_attr */
1049
1050 if (resp->status == 0) {
1051 p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */
1052 p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */
1053 p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */
1054 p = xdr_encode_hyper(p, s->f_files); /* total inodes */
1055 p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */
1056 p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */
1057 *p++ = htonl(resp->invarsec); /* mean unchanged time */
1058 }
1059 return xdr_ressize_check(rqstp, p);
1060}
1061
1062/* FSINFO */
1063int
1064nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p)
1065{
1066 struct nfsd3_fsinfores *resp = rqstp->rq_resp;
1067
1068 *p++ = xdr_zero; /* no post_op_attr */
1069
1070 if (resp->status == 0) {
1071 *p++ = htonl(resp->f_rtmax);
1072 *p++ = htonl(resp->f_rtpref);
1073 *p++ = htonl(resp->f_rtmult);
1074 *p++ = htonl(resp->f_wtmax);
1075 *p++ = htonl(resp->f_wtpref);
1076 *p++ = htonl(resp->f_wtmult);
1077 *p++ = htonl(resp->f_dtpref);
1078 p = xdr_encode_hyper(p, resp->f_maxfilesize);
1079 *p++ = xdr_one;
1080 *p++ = xdr_zero;
1081 *p++ = htonl(resp->f_properties);
1082 }
1083
1084 return xdr_ressize_check(rqstp, p);
1085}
1086
1087/* PATHCONF */
1088int
1089nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p)
1090{
1091 struct nfsd3_pathconfres *resp = rqstp->rq_resp;
1092
1093 *p++ = xdr_zero; /* no post_op_attr */
1094
1095 if (resp->status == 0) {
1096 *p++ = htonl(resp->p_link_max);
1097 *p++ = htonl(resp->p_name_max);
1098 *p++ = htonl(resp->p_no_trunc);
1099 *p++ = htonl(resp->p_chown_restricted);
1100 *p++ = htonl(resp->p_case_insensitive);
1101 *p++ = htonl(resp->p_case_preserving);
1102 }
1103
1104 return xdr_ressize_check(rqstp, p);
1105}
1106
1107/* COMMIT */
1108int
1109nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p)
1110{
1111 struct nfsd3_commitres *resp = rqstp->rq_resp;
1112 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1113
1114 p = encode_wcc_data(rqstp, p, &resp->fh);
1115 /* Write verifier */
1116 if (resp->status == 0) {
1117 /* unique identifier, y2038 overflow can be ignored */
1118 *p++ = htonl((u32)nn->nfssvc_boot.tv_sec);
1119 *p++ = htonl(nn->nfssvc_boot.tv_nsec);
1120 }
1121 return xdr_ressize_check(rqstp, p);
1122}
1123
1124/*
1125 * XDR release functions
1126 */
1127void
1128nfs3svc_release_fhandle(struct svc_rqst *rqstp)
1129{
1130 struct nfsd3_attrstat *resp = rqstp->rq_resp;
1131
1132 fh_put(&resp->fh);
1133}
1134
1135void
1136nfs3svc_release_fhandle2(struct svc_rqst *rqstp)
1137{
1138 struct nfsd3_fhandle_pair *resp = rqstp->rq_resp;
1139
1140 fh_put(&resp->fh1);
1141 fh_put(&resp->fh2);
1142}