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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                                      (d_inode(fhp->fh_dentry)->i_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 
362         p = decode_fh(p, &args->fh);
363         if (!p)
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 
412 int
413 nfs3svc_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 }
435 int
436 nfs3svc_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 
447 int
448 nfs3svc_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 = min_t(unsigned int, rqstp->rq_arg.page_len, PAGE_SIZE);
483                 old = page_address(rqstp->rq_arg.pages[0]);
484         }
485         while (len && avail && *old) {
486                 *new++ = *old++;
487                 len--;
488                 avail--;
489         }
490         *new = '\0';
491         if (len)
492                 return 0;
493 
494         return 1;
495 }
496 
497 int
498 nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p,
499                                         struct nfsd3_mknodargs *args)
500 {
501         if (!(p = decode_fh(p, &args->fh))
502          || !(p = decode_filename(p, &args->name, &args->len)))
503                 return 0;
504 
505         args->ftype = ntohl(*p++);
506 
507         if (args->ftype == NF3BLK  || args->ftype == NF3CHR
508          || args->ftype == NF3SOCK || args->ftype == NF3FIFO)
509                 p = decode_sattr3(p, &args->attrs);
510 
511         if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
512                 args->major = ntohl(*p++);
513                 args->minor = ntohl(*p++);
514         }
515 
516         return xdr_argsize_check(rqstp, p);
517 }
518 
519 int
520 nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p,
521                                         struct nfsd3_renameargs *args)
522 {
523         if (!(p = decode_fh(p, &args->ffh))
524          || !(p = decode_filename(p, &args->fname, &args->flen))
525          || !(p = decode_fh(p, &args->tfh))
526          || !(p = decode_filename(p, &args->tname, &args->tlen)))
527                 return 0;
528 
529         return xdr_argsize_check(rqstp, p);
530 }
531 
532 int
533 nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p,
534                                         struct nfsd3_readlinkargs *args)
535 {
536         p = decode_fh(p, &args->fh);
537         if (!p)
538                 return 0;
539         args->buffer = page_address(*(rqstp->rq_next_page++));
540 
541         return xdr_argsize_check(rqstp, p);
542 }
543 
544 int
545 nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p,
546                                         struct nfsd3_linkargs *args)
547 {
548         if (!(p = decode_fh(p, &args->ffh))
549          || !(p = decode_fh(p, &args->tfh))
550          || !(p = decode_filename(p, &args->tname, &args->tlen)))
551                 return 0;
552 
553         return xdr_argsize_check(rqstp, p);
554 }
555 
556 int
557 nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p,
558                                         struct nfsd3_readdirargs *args)
559 {
560         p = decode_fh(p, &args->fh);
561         if (!p)
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         args->count  = min_t(u32, args->count, PAGE_SIZE);
568         args->buffer = page_address(*(rqstp->rq_next_page++));
569 
570         return xdr_argsize_check(rqstp, p);
571 }
572 
573 int
574 nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p,
575                                         struct nfsd3_readdirargs *args)
576 {
577         int len;
578         u32 max_blocksize = svc_max_payload(rqstp);
579 
580         p = decode_fh(p, &args->fh);
581         if (!p)
582                 return 0;
583         p = xdr_decode_hyper(p, &args->cookie);
584         args->verf     = p; p += 2;
585         args->dircount = ntohl(*p++);
586         args->count    = ntohl(*p++);
587 
588         len = args->count = min(args->count, max_blocksize);
589         while (len > 0) {
590                 struct page *p = *(rqstp->rq_next_page++);
591                 if (!args->buffer)
592                         args->buffer = page_address(p);
593                 len -= PAGE_SIZE;
594         }
595 
596         return xdr_argsize_check(rqstp, p);
597 }
598 
599 int
600 nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p,
601                                         struct nfsd3_commitargs *args)
602 {
603         p = decode_fh(p, &args->fh);
604         if (!p)
605                 return 0;
606         p = xdr_decode_hyper(p, &args->offset);
607         args->count = ntohl(*p++);
608 
609         return xdr_argsize_check(rqstp, p);
610 }
611 
612 /*
613  * XDR encode functions
614  */
615 /*
616  * There must be an encoding function for void results so svc_process
617  * will work properly.
618  */
619 int
620 nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
621 {
622         return xdr_ressize_check(rqstp, p);
623 }
624 
625 /* GETATTR */
626 int
627 nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p,
628                                         struct nfsd3_attrstat *resp)
629 {
630         if (resp->status == 0) {
631                 lease_get_mtime(d_inode(resp->fh.fh_dentry),
632                                 &resp->stat.mtime);
633                 p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat);
634         }
635         return xdr_ressize_check(rqstp, p);
636 }
637 
638 /* SETATTR, REMOVE, RMDIR */
639 int
640 nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p,
641                                         struct nfsd3_attrstat *resp)
642 {
643         p = encode_wcc_data(rqstp, p, &resp->fh);
644         return xdr_ressize_check(rqstp, p);
645 }
646 
647 /* LOOKUP */
648 int
649 nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p,
650                                         struct nfsd3_diropres *resp)
651 {
652         if (resp->status == 0) {
653                 p = encode_fh(p, &resp->fh);
654                 p = encode_post_op_attr(rqstp, p, &resp->fh);
655         }
656         p = encode_post_op_attr(rqstp, p, &resp->dirfh);
657         return xdr_ressize_check(rqstp, p);
658 }
659 
660 /* ACCESS */
661 int
662 nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p,
663                                         struct nfsd3_accessres *resp)
664 {
665         p = encode_post_op_attr(rqstp, p, &resp->fh);
666         if (resp->status == 0)
667                 *p++ = htonl(resp->access);
668         return xdr_ressize_check(rqstp, p);
669 }
670 
671 /* READLINK */
672 int
673 nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p,
674                                         struct nfsd3_readlinkres *resp)
675 {
676         p = encode_post_op_attr(rqstp, p, &resp->fh);
677         if (resp->status == 0) {
678                 *p++ = htonl(resp->len);
679                 xdr_ressize_check(rqstp, p);
680                 rqstp->rq_res.page_len = resp->len;
681                 if (resp->len & 3) {
682                         /* need to pad the tail */
683                         rqstp->rq_res.tail[0].iov_base = p;
684                         *p = 0;
685                         rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
686                 }
687                 return 1;
688         } else
689                 return xdr_ressize_check(rqstp, p);
690 }
691 
692 /* READ */
693 int
694 nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p,
695                                         struct nfsd3_readres *resp)
696 {
697         p = encode_post_op_attr(rqstp, p, &resp->fh);
698         if (resp->status == 0) {
699                 *p++ = htonl(resp->count);
700                 *p++ = htonl(resp->eof);
701                 *p++ = htonl(resp->count);      /* xdr opaque count */
702                 xdr_ressize_check(rqstp, p);
703                 /* now update rqstp->rq_res to reflect data as well */
704                 rqstp->rq_res.page_len = resp->count;
705                 if (resp->count & 3) {
706                         /* need to pad the tail */
707                         rqstp->rq_res.tail[0].iov_base = p;
708                         *p = 0;
709                         rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
710                 }
711                 return 1;
712         } else
713                 return xdr_ressize_check(rqstp, p);
714 }
715 
716 /* WRITE */
717 int
718 nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p,
719                                         struct nfsd3_writeres *resp)
720 {
721         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
722 
723         p = encode_wcc_data(rqstp, p, &resp->fh);
724         if (resp->status == 0) {
725                 *p++ = htonl(resp->count);
726                 *p++ = htonl(resp->committed);
727                 *p++ = htonl(nn->nfssvc_boot.tv_sec);
728                 *p++ = htonl(nn->nfssvc_boot.tv_usec);
729         }
730         return xdr_ressize_check(rqstp, p);
731 }
732 
733 /* CREATE, MKDIR, SYMLINK, MKNOD */
734 int
735 nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p,
736                                         struct nfsd3_diropres *resp)
737 {
738         if (resp->status == 0) {
739                 *p++ = xdr_one;
740                 p = encode_fh(p, &resp->fh);
741                 p = encode_post_op_attr(rqstp, p, &resp->fh);
742         }
743         p = encode_wcc_data(rqstp, p, &resp->dirfh);
744         return xdr_ressize_check(rqstp, p);
745 }
746 
747 /* RENAME */
748 int
749 nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p,
750                                         struct nfsd3_renameres *resp)
751 {
752         p = encode_wcc_data(rqstp, p, &resp->ffh);
753         p = encode_wcc_data(rqstp, p, &resp->tfh);
754         return xdr_ressize_check(rqstp, p);
755 }
756 
757 /* LINK */
758 int
759 nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p,
760                                         struct nfsd3_linkres *resp)
761 {
762         p = encode_post_op_attr(rqstp, p, &resp->fh);
763         p = encode_wcc_data(rqstp, p, &resp->tfh);
764         return xdr_ressize_check(rqstp, p);
765 }
766 
767 /* READDIR */
768 int
769 nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p,
770                                         struct nfsd3_readdirres *resp)
771 {
772         p = encode_post_op_attr(rqstp, p, &resp->fh);
773 
774         if (resp->status == 0) {
775                 /* stupid readdir cookie */
776                 memcpy(p, resp->verf, 8); p += 2;
777                 xdr_ressize_check(rqstp, p);
778                 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
779                         return 1; /*No room for trailer */
780                 rqstp->rq_res.page_len = (resp->count) << 2;
781 
782                 /* add the 'tail' to the end of the 'head' page - page 0. */
783                 rqstp->rq_res.tail[0].iov_base = p;
784                 *p++ = 0;               /* no more entries */
785                 *p++ = htonl(resp->common.err == nfserr_eof);
786                 rqstp->rq_res.tail[0].iov_len = 2<<2;
787                 return 1;
788         } else
789                 return xdr_ressize_check(rqstp, p);
790 }
791 
792 static __be32 *
793 encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
794              int namlen, u64 ino)
795 {
796         *p++ = xdr_one;                          /* mark entry present */
797         p    = xdr_encode_hyper(p, ino);         /* file id */
798         p    = xdr_encode_array(p, name, namlen);/* name length & name */
799 
800         cd->offset = p;                         /* remember pointer */
801         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
802 
803         return p;
804 }
805 
806 static __be32
807 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
808                  const char *name, int namlen, u64 ino)
809 {
810         struct svc_export       *exp;
811         struct dentry           *dparent, *dchild;
812         __be32 rv = nfserr_noent;
813 
814         dparent = cd->fh.fh_dentry;
815         exp  = cd->fh.fh_export;
816 
817         if (isdotent(name, namlen)) {
818                 if (namlen == 2) {
819                         dchild = dget_parent(dparent);
820                         /* filesystem root - cannot return filehandle for ".." */
821                         if (dchild == dparent)
822                                 goto out;
823                 } else
824                         dchild = dget(dparent);
825         } else
826                 dchild = lookup_one_len_unlocked(name, dparent, namlen);
827         if (IS_ERR(dchild))
828                 return rv;
829         if (d_mountpoint(dchild))
830                 goto out;
831         if (d_really_is_negative(dchild))
832                 goto out;
833         if (dchild->d_inode->i_ino != ino)
834                 goto out;
835         rv = fh_compose(fhp, exp, dchild, &cd->fh);
836 out:
837         dput(dchild);
838         return rv;
839 }
840 
841 static __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen, u64 ino)
842 {
843         struct svc_fh   *fh = &cd->scratch;
844         __be32 err;
845 
846         fh_init(fh, NFS3_FHSIZE);
847         err = compose_entry_fh(cd, fh, name, namlen, ino);
848         if (err) {
849                 *p++ = 0;
850                 *p++ = 0;
851                 goto out;
852         }
853         p = encode_post_op_attr(cd->rqstp, p, fh);
854         *p++ = xdr_one;                 /* yes, a file handle follows */
855         p = encode_fh(p, fh);
856 out:
857         fh_put(fh);
858         return p;
859 }
860 
861 /*
862  * Encode a directory entry. This one works for both normal readdir
863  * and readdirplus.
864  * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
865  * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
866  * 
867  * The readdirplus baggage is 1+21 words for post_op_attr, plus the
868  * file handle.
869  */
870 
871 #define NFS3_ENTRY_BAGGAGE      (2 + 1 + 2 + 1)
872 #define NFS3_ENTRYPLUS_BAGGAGE  (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
873 static int
874 encode_entry(struct readdir_cd *ccd, const char *name, int namlen,
875              loff_t offset, u64 ino, unsigned int d_type, int plus)
876 {
877         struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
878                                                         common);
879         __be32          *p = cd->buffer;
880         caddr_t         curr_page_addr = NULL;
881         struct page **  page;
882         int             slen;           /* string (name) length */
883         int             elen;           /* estimated entry length in words */
884         int             num_entry_words = 0;    /* actual number of words */
885 
886         if (cd->offset) {
887                 u64 offset64 = offset;
888 
889                 if (unlikely(cd->offset1)) {
890                         /* we ended up with offset on a page boundary */
891                         *cd->offset = htonl(offset64 >> 32);
892                         *cd->offset1 = htonl(offset64 & 0xffffffff);
893                         cd->offset1 = NULL;
894                 } else {
895                         xdr_encode_hyper(cd->offset, offset64);
896                 }
897         }
898 
899         /*
900         dprintk("encode_entry(%.*s @%ld%s)\n",
901                 namlen, name, (long) offset, plus? " plus" : "");
902          */
903 
904         /* truncate filename if too long */
905         namlen = min(namlen, NFS3_MAXNAMLEN);
906 
907         slen = XDR_QUADLEN(namlen);
908         elen = slen + NFS3_ENTRY_BAGGAGE
909                 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
910 
911         if (cd->buflen < elen) {
912                 cd->common.err = nfserr_toosmall;
913                 return -EINVAL;
914         }
915 
916         /* determine which page in rq_respages[] we are currently filling */
917         for (page = cd->rqstp->rq_respages + 1;
918                                 page < cd->rqstp->rq_next_page; page++) {
919                 curr_page_addr = page_address(*page);
920 
921                 if (((caddr_t)cd->buffer >= curr_page_addr) &&
922                     ((caddr_t)cd->buffer <  curr_page_addr + PAGE_SIZE))
923                         break;
924         }
925 
926         if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
927                 /* encode entry in current page */
928 
929                 p = encode_entry_baggage(cd, p, name, namlen, ino);
930 
931                 if (plus)
932                         p = encode_entryplus_baggage(cd, p, name, namlen, ino);
933                 num_entry_words = p - cd->buffer;
934         } else if (*(page+1) != NULL) {
935                 /* temporarily encode entry into next page, then move back to
936                  * current and next page in rq_respages[] */
937                 __be32 *p1, *tmp;
938                 int len1, len2;
939 
940                 /* grab next page for temporary storage of entry */
941                 p1 = tmp = page_address(*(page+1));
942 
943                 p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
944 
945                 if (plus)
946                         p1 = encode_entryplus_baggage(cd, p1, name, namlen, ino);
947 
948                 /* determine entry word length and lengths to go in pages */
949                 num_entry_words = p1 - tmp;
950                 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
951                 if ((num_entry_words << 2) < len1) {
952                         /* the actual number of words in the entry is less
953                          * than elen and can still fit in the current page
954                          */
955                         memmove(p, tmp, num_entry_words << 2);
956                         p += num_entry_words;
957 
958                         /* update offset */
959                         cd->offset = cd->buffer + (cd->offset - tmp);
960                 } else {
961                         unsigned int offset_r = (cd->offset - tmp) << 2;
962 
963                         /* update pointer to offset location.
964                          * This is a 64bit quantity, so we need to
965                          * deal with 3 cases:
966                          *  -   entirely in first page
967                          *  -   entirely in second page
968                          *  -   4 bytes in each page
969                          */
970                         if (offset_r + 8 <= len1) {
971                                 cd->offset = p + (cd->offset - tmp);
972                         } else if (offset_r >= len1) {
973                                 cd->offset -= len1 >> 2;
974                         } else {
975                                 /* sitting on the fence */
976                                 BUG_ON(offset_r != len1 - 4);
977                                 cd->offset = p + (cd->offset - tmp);
978                                 cd->offset1 = tmp;
979                         }
980 
981                         len2 = (num_entry_words << 2) - len1;
982 
983                         /* move from temp page to current and next pages */
984                         memmove(p, tmp, len1);
985                         memmove(tmp, (caddr_t)tmp+len1, len2);
986 
987                         p = tmp + (len2 >> 2);
988                 }
989         }
990         else {
991                 cd->common.err = nfserr_toosmall;
992                 return -EINVAL;
993         }
994 
995         cd->buflen -= num_entry_words;
996         cd->buffer = p;
997         cd->common.err = nfs_ok;
998         return 0;
999 
1000 }
1001 
1002 int
1003 nfs3svc_encode_entry(void *cd, const char *name,
1004                      int namlen, loff_t offset, u64 ino, unsigned int d_type)
1005 {
1006         return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
1007 }
1008 
1009 int
1010 nfs3svc_encode_entry_plus(void *cd, const char *name,
1011                           int namlen, loff_t offset, u64 ino,
1012                           unsigned int d_type)
1013 {
1014         return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
1015 }
1016 
1017 /* FSSTAT */
1018 int
1019 nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p,
1020                                         struct nfsd3_fsstatres *resp)
1021 {
1022         struct kstatfs  *s = &resp->stats;
1023         u64             bs = s->f_bsize;
1024 
1025         *p++ = xdr_zero;        /* no post_op_attr */
1026 
1027         if (resp->status == 0) {
1028                 p = xdr_encode_hyper(p, bs * s->f_blocks);      /* total bytes */
1029                 p = xdr_encode_hyper(p, bs * s->f_bfree);       /* free bytes */
1030                 p = xdr_encode_hyper(p, bs * s->f_bavail);      /* user available bytes */
1031                 p = xdr_encode_hyper(p, s->f_files);    /* total inodes */
1032                 p = xdr_encode_hyper(p, s->f_ffree);    /* free inodes */
1033                 p = xdr_encode_hyper(p, s->f_ffree);    /* user available inodes */
1034                 *p++ = htonl(resp->invarsec);   /* mean unchanged time */
1035         }
1036         return xdr_ressize_check(rqstp, p);
1037 }
1038 
1039 /* FSINFO */
1040 int
1041 nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p,
1042                                         struct nfsd3_fsinfores *resp)
1043 {
1044         *p++ = xdr_zero;        /* no post_op_attr */
1045 
1046         if (resp->status == 0) {
1047                 *p++ = htonl(resp->f_rtmax);
1048                 *p++ = htonl(resp->f_rtpref);
1049                 *p++ = htonl(resp->f_rtmult);
1050                 *p++ = htonl(resp->f_wtmax);
1051                 *p++ = htonl(resp->f_wtpref);
1052                 *p++ = htonl(resp->f_wtmult);
1053                 *p++ = htonl(resp->f_dtpref);
1054                 p = xdr_encode_hyper(p, resp->f_maxfilesize);
1055                 *p++ = xdr_one;
1056                 *p++ = xdr_zero;
1057                 *p++ = htonl(resp->f_properties);
1058         }
1059 
1060         return xdr_ressize_check(rqstp, p);
1061 }
1062 
1063 /* PATHCONF */
1064 int
1065 nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p,
1066                                         struct nfsd3_pathconfres *resp)
1067 {
1068         *p++ = xdr_zero;        /* no post_op_attr */
1069 
1070         if (resp->status == 0) {
1071                 *p++ = htonl(resp->p_link_max);
1072                 *p++ = htonl(resp->p_name_max);
1073                 *p++ = htonl(resp->p_no_trunc);
1074                 *p++ = htonl(resp->p_chown_restricted);
1075                 *p++ = htonl(resp->p_case_insensitive);
1076                 *p++ = htonl(resp->p_case_preserving);
1077         }
1078 
1079         return xdr_ressize_check(rqstp, p);
1080 }
1081 
1082 /* COMMIT */
1083 int
1084 nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p,
1085                                         struct nfsd3_commitres *resp)
1086 {
1087         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1088 
1089         p = encode_wcc_data(rqstp, p, &resp->fh);
1090         /* Write verifier */
1091         if (resp->status == 0) {
1092                 *p++ = htonl(nn->nfssvc_boot.tv_sec);
1093                 *p++ = htonl(nn->nfssvc_boot.tv_usec);
1094         }
1095         return xdr_ressize_check(rqstp, p);
1096 }
1097 
1098 /*
1099  * XDR release functions
1100  */
1101 int
1102 nfs3svc_release_fhandle(struct svc_rqst *rqstp, __be32 *p,
1103                                         struct nfsd3_attrstat *resp)
1104 {
1105         fh_put(&resp->fh);
1106         return 1;
1107 }
1108 
1109 int
1110 nfs3svc_release_fhandle2(struct svc_rqst *rqstp, __be32 *p,
1111                                         struct nfsd3_fhandle_pair *resp)
1112 {
1113         fh_put(&resp->fh1);
1114         fh_put(&resp->fh2);
1115         return 1;
1116 }
1117 

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