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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                 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 
145 static __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 
166 static __be32 *
167 encode_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);
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 
192 static __be32 *
193 encode_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  */
205 static __be32 *
206 encode_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 *
226 nfs3svc_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  */
234 static __be32 *
235 encode_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  */
258 void 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  */
278 int
279 nfs3svc_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 
286 int
287 nfs3svc_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 
303 int
304 nfs3svc_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 
314 int
315 nfs3svc_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 
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         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 
356 int
357 nfs3svc_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 
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 = 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 
499 int
500 nfs3svc_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 
521 int
522 nfs3svc_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 
534 int
535 nfs3svc_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 
545 int
546 nfs3svc_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 
557 int
558 nfs3svc_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 
576 int
577 nfs3svc_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 
604 int
605 nfs3svc_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  */
623 int
624 nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
625 {
626         return xdr_ressize_check(rqstp, p);
627 }
628 
629 /* GETATTR */
630 int
631 nfs3svc_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 */
643 int
644 nfs3svc_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 */
652 int
653 nfs3svc_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 */
665 int
666 nfs3svc_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 */
676 int
677 nfs3svc_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 */
697 int
698 nfs3svc_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 */
721 int
722 nfs3svc_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 */
738 int
739 nfs3svc_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 */
752 int
753 nfs3svc_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 */
762 int
763 nfs3svc_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 */
772 int
773 nfs3svc_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 
796 static __be32 *
797 encode_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 
810 static __be32
811 compose_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);
838 out:
839         dput(dchild);
840         return rv;
841 }
842 
843 static __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen)
844 {
845         struct svc_fh   fh;
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);
858 out:
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))
875 static int
876 encode_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 
1005 int
1006 nfs3svc_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 
1012 int
1013 nfs3svc_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 */
1021 int
1022 nfs3svc_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 */
1043 int
1044 nfs3svc_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 */
1067 int
1068 nfs3svc_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 */
1086 int
1087 nfs3svc_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  */
1104 int
1105 nfs3svc_release_fhandle(struct svc_rqst *rqstp, __be32 *p,
1106                                         struct nfsd3_attrstat *resp)
1107 {
1108         fh_put(&resp->fh);
1109         return 1;
1110 }
1111 
1112 int
1113 nfs3svc_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 }
1120 

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