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

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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  */
 22 static 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  */
 32 static __be32 *
 33 encode_time3(__be32 *p, struct timespec *time)
 34 {
 35         *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);
 36         return p;
 37 }
 38 
 39 static __be32 *
 40 decode_time3(__be32 *p, struct timespec *time)
 41 {
 42         time->tv_sec = ntohl(*p++);
 43         time->tv_nsec = ntohl(*p++);
 44         return p;
 45 }
 46 
 47 static __be32 *
 48 decode_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 
 67 static __be32 *
 68 encode_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  */
 81 static __be32 *
 82 decode_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 
 97 static __be32 *
 98 decode_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                 iap->ia_size = min_t(u64, newsize, NFS_OFFSET_MAX);
124         }
125         if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
126                 iap->ia_valid |= ATTR_ATIME;
127         } else if (tmp == 2) {          /* set to client time */
128                 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
129                 iap->ia_atime.tv_sec = ntohl(*p++);
130                 iap->ia_atime.tv_nsec = ntohl(*p++);
131         }
132         if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
133                 iap->ia_valid |= ATTR_MTIME;
134         } else if (tmp == 2) {          /* set to client time */
135                 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
136                 iap->ia_mtime.tv_sec = ntohl(*p++);
137                 iap->ia_mtime.tv_nsec = ntohl(*p++);
138         }
139         return p;
140 }
141 
142 static __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp)
143 {
144         u64 f;
145         switch(fsid_source(fhp)) {
146         default:
147         case FSIDSOURCE_DEV:
148                 p = xdr_encode_hyper(p, (u64)huge_encode_dev
149                                      (fhp->fh_dentry->d_sb->s_dev));
150                 break;
151         case FSIDSOURCE_FSID:
152                 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
153                 break;
154         case FSIDSOURCE_UUID:
155                 f = ((u64*)fhp->fh_export->ex_uuid)[0];
156                 f ^= ((u64*)fhp->fh_export->ex_uuid)[1];
157                 p = xdr_encode_hyper(p, f);
158                 break;
159         }
160         return p;
161 }
162 
163 static __be32 *
164 encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
165               struct kstat *stat)
166 {
167         *p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
168         *p++ = htonl((u32) (stat->mode & S_IALLUGO));
169         *p++ = htonl((u32) stat->nlink);
170         *p++ = htonl((u32) from_kuid(&init_user_ns, stat->uid));
171         *p++ = htonl((u32) from_kgid(&init_user_ns, stat->gid));
172         if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) {
173                 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
174         } else {
175                 p = xdr_encode_hyper(p, (u64) stat->size);
176         }
177         p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9);
178         *p++ = htonl((u32) MAJOR(stat->rdev));
179         *p++ = htonl((u32) MINOR(stat->rdev));
180         p = encode_fsid(p, fhp);
181         p = xdr_encode_hyper(p, stat->ino);
182         p = encode_time3(p, &stat->atime);
183         p = encode_time3(p, &stat->mtime);
184         p = encode_time3(p, &stat->ctime);
185 
186         return p;
187 }
188 
189 static __be32 *
190 encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
191 {
192         /* Attributes to follow */
193         *p++ = xdr_one;
194         return encode_fattr3(rqstp, p, fhp, &fhp->fh_post_attr);
195 }
196 
197 /*
198  * Encode post-operation attributes.
199  * The inode may be NULL if the call failed because of a stale file
200  * handle. In this case, no attributes are returned.
201  */
202 static __be32 *
203 encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
204 {
205         struct dentry *dentry = fhp->fh_dentry;
206         if (dentry && d_really_is_positive(dentry)) {
207                 __be32 err;
208                 struct kstat stat;
209 
210                 err = fh_getattr(fhp, &stat);
211                 if (!err) {
212                         *p++ = xdr_one;         /* attributes follow */
213                         lease_get_mtime(d_inode(dentry), &stat.mtime);
214                         return encode_fattr3(rqstp, p, fhp, &stat);
215                 }
216         }
217         *p++ = xdr_zero;
218         return p;
219 }
220 
221 /* Helper for NFSv3 ACLs */
222 __be32 *
223 nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
224 {
225         return encode_post_op_attr(rqstp, p, fhp);
226 }
227 
228 /*
229  * Enocde weak cache consistency data
230  */
231 static __be32 *
232 encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
233 {
234         struct dentry   *dentry = fhp->fh_dentry;
235 
236         if (dentry && d_really_is_positive(dentry) && fhp->fh_post_saved) {
237                 if (fhp->fh_pre_saved) {
238                         *p++ = xdr_one;
239                         p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size);
240                         p = encode_time3(p, &fhp->fh_pre_mtime);
241                         p = encode_time3(p, &fhp->fh_pre_ctime);
242                 } else {
243                         *p++ = xdr_zero;
244                 }
245                 return encode_saved_post_attr(rqstp, p, fhp);
246         }
247         /* no pre- or post-attrs */
248         *p++ = xdr_zero;
249         return encode_post_op_attr(rqstp, p, fhp);
250 }
251 
252 /*
253  * Fill in the post_op attr for the wcc data
254  */
255 void fill_post_wcc(struct svc_fh *fhp)
256 {
257         __be32 err;
258 
259         if (fhp->fh_post_saved)
260                 printk("nfsd: inode locked twice during operation.\n");
261 
262         err = fh_getattr(fhp, &fhp->fh_post_attr);
263         fhp->fh_post_change = d_inode(fhp->fh_dentry)->i_version;
264         if (err) {
265                 fhp->fh_post_saved = false;
266                 /* Grab the ctime anyway - set_change_info might use it */
267                 fhp->fh_post_attr.ctime = d_inode(fhp->fh_dentry)->i_ctime;
268         } else
269                 fhp->fh_post_saved = true;
270 }
271 
272 /*
273  * XDR decode functions
274  */
275 int
276 nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args)
277 {
278         p = decode_fh(p, &args->fh);
279         if (!p)
280                 return 0;
281         return xdr_argsize_check(rqstp, p);
282 }
283 
284 int
285 nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p,
286                                         struct nfsd3_sattrargs *args)
287 {
288         p = decode_fh(p, &args->fh);
289         if (!p)
290                 return 0;
291         p = decode_sattr3(p, &args->attrs);
292 
293         if ((args->check_guard = ntohl(*p++)) != 0) { 
294                 struct timespec time; 
295                 p = decode_time3(p, &time);
296                 args->guardtime = time.tv_sec;
297         }
298 
299         return xdr_argsize_check(rqstp, p);
300 }
301 
302 int
303 nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p,
304                                         struct nfsd3_diropargs *args)
305 {
306         if (!(p = decode_fh(p, &args->fh))
307          || !(p = decode_filename(p, &args->name, &args->len)))
308                 return 0;
309 
310         return xdr_argsize_check(rqstp, p);
311 }
312 
313 int
314 nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p,
315                                         struct nfsd3_accessargs *args)
316 {
317         p = decode_fh(p, &args->fh);
318         if (!p)
319                 return 0;
320         args->access = ntohl(*p++);
321 
322         return xdr_argsize_check(rqstp, p);
323 }
324 
325 int
326 nfs3svc_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         p = decode_fh(p, &args->fh);
334         if (!p)
335                 return 0;
336         p = xdr_decode_hyper(p, &args->offset);
337 
338         args->count = ntohl(*p++);
339         len = min(args->count, max_blocksize);
340 
341         /* set up the kvec */
342         v=0;
343         while (len > 0) {
344                 struct page *p = *(rqstp->rq_next_page++);
345 
346                 rqstp->rq_vec[v].iov_base = page_address(p);
347                 rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
348                 len -= rqstp->rq_vec[v].iov_len;
349                 v++;
350         }
351         args->vlen = v;
352         return xdr_argsize_check(rqstp, p);
353 }
354 
355 int
356 nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p,
357                                         struct nfsd3_writeargs *args)
358 {
359         unsigned int len, v, hdr, dlen;
360         u32 max_blocksize = svc_max_payload(rqstp);
361         struct kvec *head = rqstp->rq_arg.head;
362         struct kvec *tail = rqstp->rq_arg.tail;
363 
364         p = decode_fh(p, &args->fh);
365         if (!p)
366                 return 0;
367         p = xdr_decode_hyper(p, &args->offset);
368 
369         args->count = ntohl(*p++);
370         args->stable = ntohl(*p++);
371         len = args->len = ntohl(*p++);
372         if ((void *)p > head->iov_base + head->iov_len)
373                 return 0;
374         /*
375          * The count must equal the amount of data passed.
376          */
377         if (args->count != args->len)
378                 return 0;
379 
380         /*
381          * Check to make sure that we got the right number of
382          * bytes.
383          */
384         hdr = (void*)p - head->iov_base;
385         dlen = head->iov_len + rqstp->rq_arg.page_len + tail->iov_len - hdr;
386         /*
387          * Round the length of the data which was specified up to
388          * the next multiple of XDR units and then compare that
389          * against the length which was actually received.
390          * Note that when RPCSEC/GSS (for example) is used, the
391          * data buffer can be padded so dlen might be larger
392          * than required.  It must never be smaller.
393          */
394         if (dlen < XDR_QUADLEN(len)*4)
395                 return 0;
396 
397         if (args->count > max_blocksize) {
398                 args->count = max_blocksize;
399                 len = args->len = max_blocksize;
400         }
401         rqstp->rq_vec[0].iov_base = (void*)p;
402         rqstp->rq_vec[0].iov_len = head->iov_len - hdr;
403         v = 0;
404         while (len > rqstp->rq_vec[v].iov_len) {
405                 len -= rqstp->rq_vec[v].iov_len;
406                 v++;
407                 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
408                 rqstp->rq_vec[v].iov_len = PAGE_SIZE;
409         }
410         rqstp->rq_vec[v].iov_len = len;
411         args->vlen = v + 1;
412         return 1;
413 }
414 
415 int
416 nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p,
417                                         struct nfsd3_createargs *args)
418 {
419         if (!(p = decode_fh(p, &args->fh))
420          || !(p = decode_filename(p, &args->name, &args->len)))
421                 return 0;
422 
423         switch (args->createmode = ntohl(*p++)) {
424         case NFS3_CREATE_UNCHECKED:
425         case NFS3_CREATE_GUARDED:
426                 p = decode_sattr3(p, &args->attrs);
427                 break;
428         case NFS3_CREATE_EXCLUSIVE:
429                 args->verf = p;
430                 p += 2;
431                 break;
432         default:
433                 return 0;
434         }
435 
436         return xdr_argsize_check(rqstp, p);
437 }
438 int
439 nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p,
440                                         struct nfsd3_createargs *args)
441 {
442         if (!(p = decode_fh(p, &args->fh)) ||
443             !(p = decode_filename(p, &args->name, &args->len)))
444                 return 0;
445         p = decode_sattr3(p, &args->attrs);
446 
447         return xdr_argsize_check(rqstp, p);
448 }
449 
450 int
451 nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p,
452                                         struct nfsd3_symlinkargs *args)
453 {
454         unsigned int len, avail;
455         char *old, *new;
456         struct kvec *vec;
457 
458         if (!(p = decode_fh(p, &args->ffh)) ||
459             !(p = decode_filename(p, &args->fname, &args->flen))
460                 )
461                 return 0;
462         p = decode_sattr3(p, &args->attrs);
463 
464         /* now decode the pathname, which might be larger than the first page.
465          * As we have to check for nul's anyway, we copy it into a new page
466          * This page appears in the rq_res.pages list, but as pages_len is always
467          * 0, it won't get in the way
468          */
469         len = ntohl(*p++);
470         if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE)
471                 return 0;
472         args->tname = new = page_address(*(rqstp->rq_next_page++));
473         args->tlen = len;
474         /* first copy and check from the first page */
475         old = (char*)p;
476         vec = &rqstp->rq_arg.head[0];
477         if ((void *)old > vec->iov_base + vec->iov_len)
478                 return 0;
479         avail = vec->iov_len - (old - (char*)vec->iov_base);
480         while (len && avail && *old) {
481                 *new++ = *old++;
482                 len--;
483                 avail--;
484         }
485         /* now copy next page if there is one */
486         if (len && !avail && rqstp->rq_arg.page_len) {
487                 avail = min_t(unsigned int, rqstp->rq_arg.page_len, PAGE_SIZE);
488                 old = page_address(rqstp->rq_arg.pages[0]);
489         }
490         while (len && avail && *old) {
491                 *new++ = *old++;
492                 len--;
493                 avail--;
494         }
495         *new = '\0';
496         if (len)
497                 return 0;
498 
499         return 1;
500 }
501 
502 int
503 nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p,
504                                         struct nfsd3_mknodargs *args)
505 {
506         if (!(p = decode_fh(p, &args->fh))
507          || !(p = decode_filename(p, &args->name, &args->len)))
508                 return 0;
509 
510         args->ftype = ntohl(*p++);
511 
512         if (args->ftype == NF3BLK  || args->ftype == NF3CHR
513          || args->ftype == NF3SOCK || args->ftype == NF3FIFO)
514                 p = decode_sattr3(p, &args->attrs);
515 
516         if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
517                 args->major = ntohl(*p++);
518                 args->minor = ntohl(*p++);
519         }
520 
521         return xdr_argsize_check(rqstp, p);
522 }
523 
524 int
525 nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p,
526                                         struct nfsd3_renameargs *args)
527 {
528         if (!(p = decode_fh(p, &args->ffh))
529          || !(p = decode_filename(p, &args->fname, &args->flen))
530          || !(p = decode_fh(p, &args->tfh))
531          || !(p = decode_filename(p, &args->tname, &args->tlen)))
532                 return 0;
533 
534         return xdr_argsize_check(rqstp, p);
535 }
536 
537 int
538 nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p,
539                                         struct nfsd3_readlinkargs *args)
540 {
541         p = decode_fh(p, &args->fh);
542         if (!p)
543                 return 0;
544         args->buffer = page_address(*(rqstp->rq_next_page++));
545 
546         return xdr_argsize_check(rqstp, p);
547 }
548 
549 int
550 nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p,
551                                         struct nfsd3_linkargs *args)
552 {
553         if (!(p = decode_fh(p, &args->ffh))
554          || !(p = decode_fh(p, &args->tfh))
555          || !(p = decode_filename(p, &args->tname, &args->tlen)))
556                 return 0;
557 
558         return xdr_argsize_check(rqstp, p);
559 }
560 
561 int
562 nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p,
563                                         struct nfsd3_readdirargs *args)
564 {
565         p = decode_fh(p, &args->fh);
566         if (!p)
567                 return 0;
568         p = xdr_decode_hyper(p, &args->cookie);
569         args->verf   = p; p += 2;
570         args->dircount = ~0;
571         args->count  = ntohl(*p++);
572         args->count  = min_t(u32, args->count, PAGE_SIZE);
573         args->buffer = page_address(*(rqstp->rq_next_page++));
574 
575         return xdr_argsize_check(rqstp, p);
576 }
577 
578 int
579 nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p,
580                                         struct nfsd3_readdirargs *args)
581 {
582         int len;
583         u32 max_blocksize = svc_max_payload(rqstp);
584 
585         p = decode_fh(p, &args->fh);
586         if (!p)
587                 return 0;
588         p = xdr_decode_hyper(p, &args->cookie);
589         args->verf     = p; p += 2;
590         args->dircount = ntohl(*p++);
591         args->count    = ntohl(*p++);
592 
593         len = args->count = min(args->count, max_blocksize);
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 
604 int
605 nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p,
606                                         struct nfsd3_commitargs *args)
607 {
608         p = decode_fh(p, &args->fh);
609         if (!p)
610                 return 0;
611         p = xdr_decode_hyper(p, &args->offset);
612         args->count = ntohl(*p++);
613 
614         return xdr_argsize_check(rqstp, p);
615 }
616 
617 /*
618  * XDR encode functions
619  */
620 /*
621  * There must be an encoding function for void results so svc_process
622  * will work properly.
623  */
624 int
625 nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
626 {
627         return xdr_ressize_check(rqstp, p);
628 }
629 
630 /* GETATTR */
631 int
632 nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p,
633                                         struct nfsd3_attrstat *resp)
634 {
635         if (resp->status == 0) {
636                 lease_get_mtime(d_inode(resp->fh.fh_dentry),
637                                 &resp->stat.mtime);
638                 p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat);
639         }
640         return xdr_ressize_check(rqstp, p);
641 }
642 
643 /* SETATTR, REMOVE, RMDIR */
644 int
645 nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p,
646                                         struct nfsd3_attrstat *resp)
647 {
648         p = encode_wcc_data(rqstp, p, &resp->fh);
649         return xdr_ressize_check(rqstp, p);
650 }
651 
652 /* LOOKUP */
653 int
654 nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p,
655                                         struct nfsd3_diropres *resp)
656 {
657         if (resp->status == 0) {
658                 p = encode_fh(p, &resp->fh);
659                 p = encode_post_op_attr(rqstp, p, &resp->fh);
660         }
661         p = encode_post_op_attr(rqstp, p, &resp->dirfh);
662         return xdr_ressize_check(rqstp, p);
663 }
664 
665 /* ACCESS */
666 int
667 nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p,
668                                         struct nfsd3_accessres *resp)
669 {
670         p = encode_post_op_attr(rqstp, p, &resp->fh);
671         if (resp->status == 0)
672                 *p++ = htonl(resp->access);
673         return xdr_ressize_check(rqstp, p);
674 }
675 
676 /* READLINK */
677 int
678 nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p,
679                                         struct nfsd3_readlinkres *resp)
680 {
681         p = encode_post_op_attr(rqstp, p, &resp->fh);
682         if (resp->status == 0) {
683                 *p++ = htonl(resp->len);
684                 xdr_ressize_check(rqstp, p);
685                 rqstp->rq_res.page_len = resp->len;
686                 if (resp->len & 3) {
687                         /* need to pad the tail */
688                         rqstp->rq_res.tail[0].iov_base = p;
689                         *p = 0;
690                         rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
691                 }
692                 return 1;
693         } else
694                 return xdr_ressize_check(rqstp, p);
695 }
696 
697 /* READ */
698 int
699 nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p,
700                                         struct nfsd3_readres *resp)
701 {
702         p = encode_post_op_attr(rqstp, p, &resp->fh);
703         if (resp->status == 0) {
704                 *p++ = htonl(resp->count);
705                 *p++ = htonl(resp->eof);
706                 *p++ = htonl(resp->count);      /* xdr opaque count */
707                 xdr_ressize_check(rqstp, p);
708                 /* now update rqstp->rq_res to reflect data as well */
709                 rqstp->rq_res.page_len = resp->count;
710                 if (resp->count & 3) {
711                         /* need to pad the tail */
712                         rqstp->rq_res.tail[0].iov_base = p;
713                         *p = 0;
714                         rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
715                 }
716                 return 1;
717         } else
718                 return xdr_ressize_check(rqstp, p);
719 }
720 
721 /* WRITE */
722 int
723 nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p,
724                                         struct nfsd3_writeres *resp)
725 {
726         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
727 
728         p = encode_wcc_data(rqstp, p, &resp->fh);
729         if (resp->status == 0) {
730                 *p++ = htonl(resp->count);
731                 *p++ = htonl(resp->committed);
732                 *p++ = htonl(nn->nfssvc_boot.tv_sec);
733                 *p++ = htonl(nn->nfssvc_boot.tv_usec);
734         }
735         return xdr_ressize_check(rqstp, p);
736 }
737 
738 /* CREATE, MKDIR, SYMLINK, MKNOD */
739 int
740 nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p,
741                                         struct nfsd3_diropres *resp)
742 {
743         if (resp->status == 0) {
744                 *p++ = xdr_one;
745                 p = encode_fh(p, &resp->fh);
746                 p = encode_post_op_attr(rqstp, p, &resp->fh);
747         }
748         p = encode_wcc_data(rqstp, p, &resp->dirfh);
749         return xdr_ressize_check(rqstp, p);
750 }
751 
752 /* RENAME */
753 int
754 nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p,
755                                         struct nfsd3_renameres *resp)
756 {
757         p = encode_wcc_data(rqstp, p, &resp->ffh);
758         p = encode_wcc_data(rqstp, p, &resp->tfh);
759         return xdr_ressize_check(rqstp, p);
760 }
761 
762 /* LINK */
763 int
764 nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p,
765                                         struct nfsd3_linkres *resp)
766 {
767         p = encode_post_op_attr(rqstp, p, &resp->fh);
768         p = encode_wcc_data(rqstp, p, &resp->tfh);
769         return xdr_ressize_check(rqstp, p);
770 }
771 
772 /* READDIR */
773 int
774 nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p,
775                                         struct nfsd3_readdirres *resp)
776 {
777         p = encode_post_op_attr(rqstp, p, &resp->fh);
778 
779         if (resp->status == 0) {
780                 /* stupid readdir cookie */
781                 memcpy(p, resp->verf, 8); p += 2;
782                 xdr_ressize_check(rqstp, p);
783                 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
784                         return 1; /*No room for trailer */
785                 rqstp->rq_res.page_len = (resp->count) << 2;
786 
787                 /* add the 'tail' to the end of the 'head' page - page 0. */
788                 rqstp->rq_res.tail[0].iov_base = p;
789                 *p++ = 0;               /* no more entries */
790                 *p++ = htonl(resp->common.err == nfserr_eof);
791                 rqstp->rq_res.tail[0].iov_len = 2<<2;
792                 return 1;
793         } else
794                 return xdr_ressize_check(rqstp, p);
795 }
796 
797 static __be32 *
798 encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
799              int namlen, u64 ino)
800 {
801         *p++ = xdr_one;                          /* mark entry present */
802         p    = xdr_encode_hyper(p, ino);         /* file id */
803         p    = xdr_encode_array(p, name, namlen);/* name length & name */
804 
805         cd->offset = p;                         /* remember pointer */
806         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
807 
808         return p;
809 }
810 
811 static __be32
812 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
813                  const char *name, int namlen, u64 ino)
814 {
815         struct svc_export       *exp;
816         struct dentry           *dparent, *dchild;
817         __be32 rv = nfserr_noent;
818 
819         dparent = cd->fh.fh_dentry;
820         exp  = cd->fh.fh_export;
821 
822         if (isdotent(name, namlen)) {
823                 if (namlen == 2) {
824                         dchild = dget_parent(dparent);
825                         /* filesystem root - cannot return filehandle for ".." */
826                         if (dchild == dparent)
827                                 goto out;
828                 } else
829                         dchild = dget(dparent);
830         } else
831                 dchild = lookup_one_len_unlocked(name, dparent, namlen);
832         if (IS_ERR(dchild))
833                 return rv;
834         if (d_mountpoint(dchild))
835                 goto out;
836         if (d_really_is_negative(dchild))
837                 goto out;
838         if (dchild->d_inode->i_ino != ino)
839                 goto out;
840         rv = fh_compose(fhp, exp, dchild, &cd->fh);
841 out:
842         dput(dchild);
843         return rv;
844 }
845 
846 static __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen, u64 ino)
847 {
848         struct svc_fh   *fh = &cd->scratch;
849         __be32 err;
850 
851         fh_init(fh, NFS3_FHSIZE);
852         err = compose_entry_fh(cd, fh, name, namlen, ino);
853         if (err) {
854                 *p++ = 0;
855                 *p++ = 0;
856                 goto out;
857         }
858         p = encode_post_op_attr(cd->rqstp, p, fh);
859         *p++ = xdr_one;                 /* yes, a file handle follows */
860         p = encode_fh(p, fh);
861 out:
862         fh_put(fh);
863         return p;
864 }
865 
866 /*
867  * Encode a directory entry. This one works for both normal readdir
868  * and readdirplus.
869  * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
870  * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
871  * 
872  * The readdirplus baggage is 1+21 words for post_op_attr, plus the
873  * file handle.
874  */
875 
876 #define NFS3_ENTRY_BAGGAGE      (2 + 1 + 2 + 1)
877 #define NFS3_ENTRYPLUS_BAGGAGE  (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
878 static int
879 encode_entry(struct readdir_cd *ccd, const char *name, int namlen,
880              loff_t offset, u64 ino, unsigned int d_type, int plus)
881 {
882         struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
883                                                         common);
884         __be32          *p = cd->buffer;
885         caddr_t         curr_page_addr = NULL;
886         struct page **  page;
887         int             slen;           /* string (name) length */
888         int             elen;           /* estimated entry length in words */
889         int             num_entry_words = 0;    /* actual number of words */
890 
891         if (cd->offset) {
892                 u64 offset64 = offset;
893 
894                 if (unlikely(cd->offset1)) {
895                         /* we ended up with offset on a page boundary */
896                         *cd->offset = htonl(offset64 >> 32);
897                         *cd->offset1 = htonl(offset64 & 0xffffffff);
898                         cd->offset1 = NULL;
899                 } else {
900                         xdr_encode_hyper(cd->offset, offset64);
901                 }
902         }
903 
904         /*
905         dprintk("encode_entry(%.*s @%ld%s)\n",
906                 namlen, name, (long) offset, plus? " plus" : "");
907          */
908 
909         /* truncate filename if too long */
910         namlen = min(namlen, NFS3_MAXNAMLEN);
911 
912         slen = XDR_QUADLEN(namlen);
913         elen = slen + NFS3_ENTRY_BAGGAGE
914                 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
915 
916         if (cd->buflen < elen) {
917                 cd->common.err = nfserr_toosmall;
918                 return -EINVAL;
919         }
920 
921         /* determine which page in rq_respages[] we are currently filling */
922         for (page = cd->rqstp->rq_respages + 1;
923                                 page < cd->rqstp->rq_next_page; page++) {
924                 curr_page_addr = page_address(*page);
925 
926                 if (((caddr_t)cd->buffer >= curr_page_addr) &&
927                     ((caddr_t)cd->buffer <  curr_page_addr + PAGE_SIZE))
928                         break;
929         }
930 
931         if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
932                 /* encode entry in current page */
933 
934                 p = encode_entry_baggage(cd, p, name, namlen, ino);
935 
936                 if (plus)
937                         p = encode_entryplus_baggage(cd, p, name, namlen, ino);
938                 num_entry_words = p - cd->buffer;
939         } else if (*(page+1) != NULL) {
940                 /* temporarily encode entry into next page, then move back to
941                  * current and next page in rq_respages[] */
942                 __be32 *p1, *tmp;
943                 int len1, len2;
944 
945                 /* grab next page for temporary storage of entry */
946                 p1 = tmp = page_address(*(page+1));
947 
948                 p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
949 
950                 if (plus)
951                         p1 = encode_entryplus_baggage(cd, p1, name, namlen, ino);
952 
953                 /* determine entry word length and lengths to go in pages */
954                 num_entry_words = p1 - tmp;
955                 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
956                 if ((num_entry_words << 2) < len1) {
957                         /* the actual number of words in the entry is less
958                          * than elen and can still fit in the current page
959                          */
960                         memmove(p, tmp, num_entry_words << 2);
961                         p += num_entry_words;
962 
963                         /* update offset */
964                         cd->offset = cd->buffer + (cd->offset - tmp);
965                 } else {
966                         unsigned int offset_r = (cd->offset - tmp) << 2;
967 
968                         /* update pointer to offset location.
969                          * This is a 64bit quantity, so we need to
970                          * deal with 3 cases:
971                          *  -   entirely in first page
972                          *  -   entirely in second page
973                          *  -   4 bytes in each page
974                          */
975                         if (offset_r + 8 <= len1) {
976                                 cd->offset = p + (cd->offset - tmp);
977                         } else if (offset_r >= len1) {
978                                 cd->offset -= len1 >> 2;
979                         } else {
980                                 /* sitting on the fence */
981                                 BUG_ON(offset_r != len1 - 4);
982                                 cd->offset = p + (cd->offset - tmp);
983                                 cd->offset1 = tmp;
984                         }
985 
986                         len2 = (num_entry_words << 2) - len1;
987 
988                         /* move from temp page to current and next pages */
989                         memmove(p, tmp, len1);
990                         memmove(tmp, (caddr_t)tmp+len1, len2);
991 
992                         p = tmp + (len2 >> 2);
993                 }
994         }
995         else {
996                 cd->common.err = nfserr_toosmall;
997                 return -EINVAL;
998         }
999 
1000         cd->buflen -= num_entry_words;
1001         cd->buffer = p;
1002         cd->common.err = nfs_ok;
1003         return 0;
1004 
1005 }
1006 
1007 int
1008 nfs3svc_encode_entry(void *cd, const char *name,
1009                      int namlen, loff_t offset, u64 ino, unsigned int d_type)
1010 {
1011         return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
1012 }
1013 
1014 int
1015 nfs3svc_encode_entry_plus(void *cd, const char *name,
1016                           int namlen, loff_t offset, u64 ino,
1017                           unsigned int d_type)
1018 {
1019         return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
1020 }
1021 
1022 /* FSSTAT */
1023 int
1024 nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p,
1025                                         struct nfsd3_fsstatres *resp)
1026 {
1027         struct kstatfs  *s = &resp->stats;
1028         u64             bs = s->f_bsize;
1029 
1030         *p++ = xdr_zero;        /* no post_op_attr */
1031 
1032         if (resp->status == 0) {
1033                 p = xdr_encode_hyper(p, bs * s->f_blocks);      /* total bytes */
1034                 p = xdr_encode_hyper(p, bs * s->f_bfree);       /* free bytes */
1035                 p = xdr_encode_hyper(p, bs * s->f_bavail);      /* user available bytes */
1036                 p = xdr_encode_hyper(p, s->f_files);    /* total inodes */
1037                 p = xdr_encode_hyper(p, s->f_ffree);    /* free inodes */
1038                 p = xdr_encode_hyper(p, s->f_ffree);    /* user available inodes */
1039                 *p++ = htonl(resp->invarsec);   /* mean unchanged time */
1040         }
1041         return xdr_ressize_check(rqstp, p);
1042 }
1043 
1044 /* FSINFO */
1045 int
1046 nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p,
1047                                         struct nfsd3_fsinfores *resp)
1048 {
1049         *p++ = xdr_zero;        /* no post_op_attr */
1050 
1051         if (resp->status == 0) {
1052                 *p++ = htonl(resp->f_rtmax);
1053                 *p++ = htonl(resp->f_rtpref);
1054                 *p++ = htonl(resp->f_rtmult);
1055                 *p++ = htonl(resp->f_wtmax);
1056                 *p++ = htonl(resp->f_wtpref);
1057                 *p++ = htonl(resp->f_wtmult);
1058                 *p++ = htonl(resp->f_dtpref);
1059                 p = xdr_encode_hyper(p, resp->f_maxfilesize);
1060                 *p++ = xdr_one;
1061                 *p++ = xdr_zero;
1062                 *p++ = htonl(resp->f_properties);
1063         }
1064 
1065         return xdr_ressize_check(rqstp, p);
1066 }
1067 
1068 /* PATHCONF */
1069 int
1070 nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p,
1071                                         struct nfsd3_pathconfres *resp)
1072 {
1073         *p++ = xdr_zero;        /* no post_op_attr */
1074 
1075         if (resp->status == 0) {
1076                 *p++ = htonl(resp->p_link_max);
1077                 *p++ = htonl(resp->p_name_max);
1078                 *p++ = htonl(resp->p_no_trunc);
1079                 *p++ = htonl(resp->p_chown_restricted);
1080                 *p++ = htonl(resp->p_case_insensitive);
1081                 *p++ = htonl(resp->p_case_preserving);
1082         }
1083 
1084         return xdr_ressize_check(rqstp, p);
1085 }
1086 
1087 /* COMMIT */
1088 int
1089 nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p,
1090                                         struct nfsd3_commitres *resp)
1091 {
1092         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1093 
1094         p = encode_wcc_data(rqstp, p, &resp->fh);
1095         /* Write verifier */
1096         if (resp->status == 0) {
1097                 *p++ = htonl(nn->nfssvc_boot.tv_sec);
1098                 *p++ = htonl(nn->nfssvc_boot.tv_usec);
1099         }
1100         return xdr_ressize_check(rqstp, p);
1101 }
1102 
1103 /*
1104  * XDR release functions
1105  */
1106 int
1107 nfs3svc_release_fhandle(struct svc_rqst *rqstp, __be32 *p,
1108                                         struct nfsd3_attrstat *resp)
1109 {
1110         fh_put(&resp->fh);
1111         return 1;
1112 }
1113 
1114 int
1115 nfs3svc_release_fhandle2(struct svc_rqst *rqstp, __be32 *p,
1116                                         struct nfsd3_fhandle_pair *resp)
1117 {
1118         fh_put(&resp->fh1);
1119         fh_put(&resp->fh2);
1120         return 1;
1121 }
1122 

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