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

Version: ~ [ linux-5.8 ] ~ [ linux-5.7.14 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.57 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.138 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.193 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.232 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.232 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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  1 /*
  2  * Process version 2 NFS requests.
  3  *
  4  * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
  5  */
  6 
  7 #include <linux/namei.h>
  8 
  9 #include "cache.h"
 10 #include "xdr.h"
 11 #include "vfs.h"
 12 
 13 typedef struct svc_rqst svc_rqst;
 14 typedef struct svc_buf  svc_buf;
 15 
 16 #define NFSDDBG_FACILITY                NFSDDBG_PROC
 17 
 18 
 19 static __be32
 20 nfsd_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
 21 {
 22         return nfs_ok;
 23 }
 24 
 25 static __be32
 26 nfsd_return_attrs(__be32 err, struct nfsd_attrstat *resp)
 27 {
 28         if (err) return err;
 29         return fh_getattr(&resp->fh, &resp->stat);
 30 }
 31 static __be32
 32 nfsd_return_dirop(__be32 err, struct nfsd_diropres *resp)
 33 {
 34         if (err) return err;
 35         return fh_getattr(&resp->fh, &resp->stat);
 36 }
 37 /*
 38  * Get a file's attributes
 39  * N.B. After this call resp->fh needs an fh_put
 40  */
 41 static __be32
 42 nfsd_proc_getattr(struct svc_rqst *rqstp, struct nfsd_fhandle  *argp,
 43                                           struct nfsd_attrstat *resp)
 44 {
 45         __be32 nfserr;
 46         dprintk("nfsd: GETATTR  %s\n", SVCFH_fmt(&argp->fh));
 47 
 48         fh_copy(&resp->fh, &argp->fh);
 49         nfserr = fh_verify(rqstp, &resp->fh, 0,
 50                         NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
 51         return nfsd_return_attrs(nfserr, resp);
 52 }
 53 
 54 /*
 55  * Set a file's attributes
 56  * N.B. After this call resp->fh needs an fh_put
 57  */
 58 static __be32
 59 nfsd_proc_setattr(struct svc_rqst *rqstp, struct nfsd_sattrargs *argp,
 60                                           struct nfsd_attrstat  *resp)
 61 {
 62         __be32 nfserr;
 63         dprintk("nfsd: SETATTR  %s, valid=%x, size=%ld\n",
 64                 SVCFH_fmt(&argp->fh),
 65                 argp->attrs.ia_valid, (long) argp->attrs.ia_size);
 66 
 67         fh_copy(&resp->fh, &argp->fh);
 68         nfserr = nfsd_setattr(rqstp, &resp->fh, &argp->attrs,0, (time_t)0);
 69         return nfsd_return_attrs(nfserr, resp);
 70 }
 71 
 72 /*
 73  * Look up a path name component
 74  * Note: the dentry in the resp->fh may be negative if the file
 75  * doesn't exist yet.
 76  * N.B. After this call resp->fh needs an fh_put
 77  */
 78 static __be32
 79 nfsd_proc_lookup(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
 80                                          struct nfsd_diropres  *resp)
 81 {
 82         __be32  nfserr;
 83 
 84         dprintk("nfsd: LOOKUP   %s %.*s\n",
 85                 SVCFH_fmt(&argp->fh), argp->len, argp->name);
 86 
 87         fh_init(&resp->fh, NFS_FHSIZE);
 88         nfserr = nfsd_lookup(rqstp, &argp->fh, argp->name, argp->len,
 89                                  &resp->fh);
 90 
 91         fh_put(&argp->fh);
 92         return nfsd_return_dirop(nfserr, resp);
 93 }
 94 
 95 /*
 96  * Read a symlink.
 97  */
 98 static __be32
 99 nfsd_proc_readlink(struct svc_rqst *rqstp, struct nfsd_readlinkargs *argp,
100                                            struct nfsd_readlinkres *resp)
101 {
102         __be32  nfserr;
103 
104         dprintk("nfsd: READLINK %s\n", SVCFH_fmt(&argp->fh));
105 
106         /* Read the symlink. */
107         resp->len = NFS_MAXPATHLEN;
108         nfserr = nfsd_readlink(rqstp, &argp->fh, argp->buffer, &resp->len);
109 
110         fh_put(&argp->fh);
111         return nfserr;
112 }
113 
114 /*
115  * Read a portion of a file.
116  * N.B. After this call resp->fh needs an fh_put
117  */
118 static __be32
119 nfsd_proc_read(struct svc_rqst *rqstp, struct nfsd_readargs *argp,
120                                        struct nfsd_readres  *resp)
121 {
122         __be32  nfserr;
123 
124         dprintk("nfsd: READ    %s %d bytes at %d\n",
125                 SVCFH_fmt(&argp->fh),
126                 argp->count, argp->offset);
127 
128         /* Obtain buffer pointer for payload. 19 is 1 word for
129          * status, 17 words for fattr, and 1 word for the byte count.
130          */
131 
132         if (NFSSVC_MAXBLKSIZE_V2 < argp->count) {
133                 char buf[RPC_MAX_ADDRBUFLEN];
134                 printk(KERN_NOTICE
135                         "oversized read request from %s (%d bytes)\n",
136                                 svc_print_addr(rqstp, buf, sizeof(buf)),
137                                 argp->count);
138                 argp->count = NFSSVC_MAXBLKSIZE_V2;
139         }
140         svc_reserve_auth(rqstp, (19<<2) + argp->count + 4);
141 
142         resp->count = argp->count;
143         nfserr = nfsd_read(rqstp, fh_copy(&resp->fh, &argp->fh),
144                                   argp->offset,
145                                   rqstp->rq_vec, argp->vlen,
146                                   &resp->count);
147 
148         if (nfserr) return nfserr;
149         return fh_getattr(&resp->fh, &resp->stat);
150 }
151 
152 /*
153  * Write data to a file
154  * N.B. After this call resp->fh needs an fh_put
155  */
156 static __be32
157 nfsd_proc_write(struct svc_rqst *rqstp, struct nfsd_writeargs *argp,
158                                         struct nfsd_attrstat  *resp)
159 {
160         __be32  nfserr;
161         int     stable = 1;
162         unsigned long cnt = argp->len;
163 
164         dprintk("nfsd: WRITE    %s %d bytes at %d\n",
165                 SVCFH_fmt(&argp->fh),
166                 argp->len, argp->offset);
167 
168         nfserr = nfsd_write(rqstp, fh_copy(&resp->fh, &argp->fh), NULL,
169                                    argp->offset,
170                                    rqstp->rq_vec, argp->vlen,
171                                    &cnt,
172                                    &stable);
173         return nfsd_return_attrs(nfserr, resp);
174 }
175 
176 /*
177  * CREATE processing is complicated. The keyword here is `overloaded.'
178  * The parent directory is kept locked between the check for existence
179  * and the actual create() call in compliance with VFS protocols.
180  * N.B. After this call _both_ argp->fh and resp->fh need an fh_put
181  */
182 static __be32
183 nfsd_proc_create(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
184                                          struct nfsd_diropres   *resp)
185 {
186         svc_fh          *dirfhp = &argp->fh;
187         svc_fh          *newfhp = &resp->fh;
188         struct iattr    *attr = &argp->attrs;
189         struct inode    *inode;
190         struct dentry   *dchild;
191         int             type, mode;
192         __be32          nfserr;
193         int             hosterr;
194         dev_t           rdev = 0, wanted = new_decode_dev(attr->ia_size);
195 
196         dprintk("nfsd: CREATE   %s %.*s\n",
197                 SVCFH_fmt(dirfhp), argp->len, argp->name);
198 
199         /* First verify the parent file handle */
200         nfserr = fh_verify(rqstp, dirfhp, S_IFDIR, NFSD_MAY_EXEC);
201         if (nfserr)
202                 goto done; /* must fh_put dirfhp even on error */
203 
204         /* Check for NFSD_MAY_WRITE in nfsd_create if necessary */
205 
206         nfserr = nfserr_acces;
207         if (!argp->len)
208                 goto done;
209         nfserr = nfserr_exist;
210         if (isdotent(argp->name, argp->len))
211                 goto done;
212         hosterr = fh_want_write(dirfhp);
213         if (hosterr) {
214                 nfserr = nfserrno(hosterr);
215                 goto done;
216         }
217 
218         fh_lock_nested(dirfhp, I_MUTEX_PARENT);
219         dchild = lookup_one_len(argp->name, dirfhp->fh_dentry, argp->len);
220         if (IS_ERR(dchild)) {
221                 nfserr = nfserrno(PTR_ERR(dchild));
222                 goto out_unlock;
223         }
224         fh_init(newfhp, NFS_FHSIZE);
225         nfserr = fh_compose(newfhp, dirfhp->fh_export, dchild, dirfhp);
226         if (!nfserr && !dchild->d_inode)
227                 nfserr = nfserr_noent;
228         dput(dchild);
229         if (nfserr) {
230                 if (nfserr != nfserr_noent)
231                         goto out_unlock;
232                 /*
233                  * If the new file handle wasn't verified, we can't tell
234                  * whether the file exists or not. Time to bail ...
235                  */
236                 nfserr = nfserr_acces;
237                 if (!newfhp->fh_dentry) {
238                         printk(KERN_WARNING 
239                                 "nfsd_proc_create: file handle not verified\n");
240                         goto out_unlock;
241                 }
242         }
243 
244         inode = newfhp->fh_dentry->d_inode;
245 
246         /* Unfudge the mode bits */
247         if (attr->ia_valid & ATTR_MODE) {
248                 type = attr->ia_mode & S_IFMT;
249                 mode = attr->ia_mode & ~S_IFMT;
250                 if (!type) {
251                         /* no type, so if target exists, assume same as that,
252                          * else assume a file */
253                         if (inode) {
254                                 type = inode->i_mode & S_IFMT;
255                                 switch(type) {
256                                 case S_IFCHR:
257                                 case S_IFBLK:
258                                         /* reserve rdev for later checking */
259                                         rdev = inode->i_rdev;
260                                         attr->ia_valid |= ATTR_SIZE;
261 
262                                         /* FALLTHROUGH */
263                                 case S_IFIFO:
264                                         /* this is probably a permission check..
265                                          * at least IRIX implements perm checking on
266                                          *   echo thing > device-special-file-or-pipe
267                                          * by doing a CREATE with type==0
268                                          */
269                                         nfserr = nfsd_permission(rqstp,
270                                                                  newfhp->fh_export,
271                                                                  newfhp->fh_dentry,
272                                                                  NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS);
273                                         if (nfserr && nfserr != nfserr_rofs)
274                                                 goto out_unlock;
275                                 }
276                         } else
277                                 type = S_IFREG;
278                 }
279         } else if (inode) {
280                 type = inode->i_mode & S_IFMT;
281                 mode = inode->i_mode & ~S_IFMT;
282         } else {
283                 type = S_IFREG;
284                 mode = 0;       /* ??? */
285         }
286 
287         attr->ia_valid |= ATTR_MODE;
288         attr->ia_mode = mode;
289 
290         /* Special treatment for non-regular files according to the
291          * gospel of sun micro
292          */
293         if (type != S_IFREG) {
294                 if (type != S_IFBLK && type != S_IFCHR) {
295                         rdev = 0;
296                 } else if (type == S_IFCHR && !(attr->ia_valid & ATTR_SIZE)) {
297                         /* If you think you've seen the worst, grok this. */
298                         type = S_IFIFO;
299                 } else {
300                         /* Okay, char or block special */
301                         if (!rdev)
302                                 rdev = wanted;
303                 }
304 
305                 /* we've used the SIZE information, so discard it */
306                 attr->ia_valid &= ~ATTR_SIZE;
307 
308                 /* Make sure the type and device matches */
309                 nfserr = nfserr_exist;
310                 if (inode && type != (inode->i_mode & S_IFMT))
311                         goto out_unlock;
312         }
313 
314         nfserr = 0;
315         if (!inode) {
316                 /* File doesn't exist. Create it and set attrs */
317                 nfserr = nfsd_create(rqstp, dirfhp, argp->name, argp->len,
318                                         attr, type, rdev, newfhp);
319         } else if (type == S_IFREG) {
320                 dprintk("nfsd:   existing %s, valid=%x, size=%ld\n",
321                         argp->name, attr->ia_valid, (long) attr->ia_size);
322                 /* File already exists. We ignore all attributes except
323                  * size, so that creat() behaves exactly like
324                  * open(..., O_CREAT|O_TRUNC|O_WRONLY).
325                  */
326                 attr->ia_valid &= ATTR_SIZE;
327                 if (attr->ia_valid)
328                         nfserr = nfsd_setattr(rqstp, newfhp, attr, 0, (time_t)0);
329         }
330 
331 out_unlock:
332         /* We don't really need to unlock, as fh_put does it. */
333         fh_unlock(dirfhp);
334         fh_drop_write(dirfhp);
335 done:
336         fh_put(dirfhp);
337         return nfsd_return_dirop(nfserr, resp);
338 }
339 
340 static __be32
341 nfsd_proc_remove(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
342                                          void                  *resp)
343 {
344         __be32  nfserr;
345 
346         dprintk("nfsd: REMOVE   %s %.*s\n", SVCFH_fmt(&argp->fh),
347                 argp->len, argp->name);
348 
349         /* Unlink. -SIFDIR means file must not be a directory */
350         nfserr = nfsd_unlink(rqstp, &argp->fh, -S_IFDIR, argp->name, argp->len);
351         fh_put(&argp->fh);
352         return nfserr;
353 }
354 
355 static __be32
356 nfsd_proc_rename(struct svc_rqst *rqstp, struct nfsd_renameargs *argp,
357                                          void                   *resp)
358 {
359         __be32  nfserr;
360 
361         dprintk("nfsd: RENAME   %s %.*s -> \n",
362                 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname);
363         dprintk("nfsd:        ->  %s %.*s\n",
364                 SVCFH_fmt(&argp->tfh), argp->tlen, argp->tname);
365 
366         nfserr = nfsd_rename(rqstp, &argp->ffh, argp->fname, argp->flen,
367                                     &argp->tfh, argp->tname, argp->tlen);
368         fh_put(&argp->ffh);
369         fh_put(&argp->tfh);
370         return nfserr;
371 }
372 
373 static __be32
374 nfsd_proc_link(struct svc_rqst *rqstp, struct nfsd_linkargs *argp,
375                                 void                        *resp)
376 {
377         __be32  nfserr;
378 
379         dprintk("nfsd: LINK     %s ->\n",
380                 SVCFH_fmt(&argp->ffh));
381         dprintk("nfsd:    %s %.*s\n",
382                 SVCFH_fmt(&argp->tfh),
383                 argp->tlen,
384                 argp->tname);
385 
386         nfserr = nfsd_link(rqstp, &argp->tfh, argp->tname, argp->tlen,
387                                   &argp->ffh);
388         fh_put(&argp->ffh);
389         fh_put(&argp->tfh);
390         return nfserr;
391 }
392 
393 static __be32
394 nfsd_proc_symlink(struct svc_rqst *rqstp, struct nfsd_symlinkargs *argp,
395                                           void                    *resp)
396 {
397         struct svc_fh   newfh;
398         __be32          nfserr;
399 
400         dprintk("nfsd: SYMLINK  %s %.*s -> %.*s\n",
401                 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname,
402                 argp->tlen, argp->tname);
403 
404         fh_init(&newfh, NFS_FHSIZE);
405         /*
406          * Create the link, look up new file and set attrs.
407          */
408         nfserr = nfsd_symlink(rqstp, &argp->ffh, argp->fname, argp->flen,
409                                                  argp->tname, argp->tlen,
410                                                  &newfh, &argp->attrs);
411 
412 
413         fh_put(&argp->ffh);
414         fh_put(&newfh);
415         return nfserr;
416 }
417 
418 /*
419  * Make directory. This operation is not idempotent.
420  * N.B. After this call resp->fh needs an fh_put
421  */
422 static __be32
423 nfsd_proc_mkdir(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
424                                         struct nfsd_diropres   *resp)
425 {
426         __be32  nfserr;
427 
428         dprintk("nfsd: MKDIR    %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
429 
430         if (resp->fh.fh_dentry) {
431                 printk(KERN_WARNING
432                         "nfsd_proc_mkdir: response already verified??\n");
433         }
434 
435         argp->attrs.ia_valid &= ~ATTR_SIZE;
436         fh_init(&resp->fh, NFS_FHSIZE);
437         nfserr = nfsd_create(rqstp, &argp->fh, argp->name, argp->len,
438                                     &argp->attrs, S_IFDIR, 0, &resp->fh);
439         fh_put(&argp->fh);
440         return nfsd_return_dirop(nfserr, resp);
441 }
442 
443 /*
444  * Remove a directory
445  */
446 static __be32
447 nfsd_proc_rmdir(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
448                                         void                  *resp)
449 {
450         __be32  nfserr;
451 
452         dprintk("nfsd: RMDIR    %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
453 
454         nfserr = nfsd_unlink(rqstp, &argp->fh, S_IFDIR, argp->name, argp->len);
455         fh_put(&argp->fh);
456         return nfserr;
457 }
458 
459 /*
460  * Read a portion of a directory.
461  */
462 static __be32
463 nfsd_proc_readdir(struct svc_rqst *rqstp, struct nfsd_readdirargs *argp,
464                                           struct nfsd_readdirres  *resp)
465 {
466         int             count;
467         __be32          nfserr;
468         loff_t          offset;
469 
470         dprintk("nfsd: READDIR  %s %d bytes at %d\n",
471                 SVCFH_fmt(&argp->fh),           
472                 argp->count, argp->cookie);
473 
474         /* Shrink to the client read size */
475         count = (argp->count >> 2) - 2;
476 
477         /* Make sure we've room for the NULL ptr & eof flag */
478         count -= 2;
479         if (count < 0)
480                 count = 0;
481 
482         resp->buffer = argp->buffer;
483         resp->offset = NULL;
484         resp->buflen = count;
485         resp->common.err = nfs_ok;
486         /* Read directory and encode entries on the fly */
487         offset = argp->cookie;
488         nfserr = nfsd_readdir(rqstp, &argp->fh, &offset, 
489                               &resp->common, nfssvc_encode_entry);
490 
491         resp->count = resp->buffer - argp->buffer;
492         if (resp->offset)
493                 *resp->offset = htonl(offset);
494 
495         fh_put(&argp->fh);
496         return nfserr;
497 }
498 
499 /*
500  * Get file system info
501  */
502 static __be32
503 nfsd_proc_statfs(struct svc_rqst * rqstp, struct nfsd_fhandle   *argp,
504                                           struct nfsd_statfsres *resp)
505 {
506         __be32  nfserr;
507 
508         dprintk("nfsd: STATFS   %s\n", SVCFH_fmt(&argp->fh));
509 
510         nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats,
511                         NFSD_MAY_BYPASS_GSS_ON_ROOT);
512         fh_put(&argp->fh);
513         return nfserr;
514 }
515 
516 /*
517  * NFSv2 Server procedures.
518  * Only the results of non-idempotent operations are cached.
519  */
520 struct nfsd_void { int dummy; };
521 
522 #define ST 1            /* status */
523 #define FH 8            /* filehandle */
524 #define AT 18           /* attributes */
525 
526 static struct svc_procedure             nfsd_procedures2[18] = {
527         [NFSPROC_NULL] = {
528                 .pc_func = (svc_procfunc) nfsd_proc_null,
529                 .pc_decode = (kxdrproc_t) nfssvc_decode_void,
530                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
531                 .pc_argsize = sizeof(struct nfsd_void),
532                 .pc_ressize = sizeof(struct nfsd_void),
533                 .pc_cachetype = RC_NOCACHE,
534                 .pc_xdrressize = ST,
535         },
536         [NFSPROC_GETATTR] = {
537                 .pc_func = (svc_procfunc) nfsd_proc_getattr,
538                 .pc_decode = (kxdrproc_t) nfssvc_decode_fhandle,
539                 .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
540                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
541                 .pc_argsize = sizeof(struct nfsd_fhandle),
542                 .pc_ressize = sizeof(struct nfsd_attrstat),
543                 .pc_cachetype = RC_NOCACHE,
544                 .pc_xdrressize = ST+AT,
545         },
546         [NFSPROC_SETATTR] = {
547                 .pc_func = (svc_procfunc) nfsd_proc_setattr,
548                 .pc_decode = (kxdrproc_t) nfssvc_decode_sattrargs,
549                 .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
550                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
551                 .pc_argsize = sizeof(struct nfsd_sattrargs),
552                 .pc_ressize = sizeof(struct nfsd_attrstat),
553                 .pc_cachetype = RC_REPLBUFF,
554                 .pc_xdrressize = ST+AT,
555         },
556         [NFSPROC_ROOT] = {
557                 .pc_decode = (kxdrproc_t) nfssvc_decode_void,
558                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
559                 .pc_argsize = sizeof(struct nfsd_void),
560                 .pc_ressize = sizeof(struct nfsd_void),
561                 .pc_cachetype = RC_NOCACHE,
562                 .pc_xdrressize = ST,
563         },
564         [NFSPROC_LOOKUP] = {
565                 .pc_func = (svc_procfunc) nfsd_proc_lookup,
566                 .pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
567                 .pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
568                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
569                 .pc_argsize = sizeof(struct nfsd_diropargs),
570                 .pc_ressize = sizeof(struct nfsd_diropres),
571                 .pc_cachetype = RC_NOCACHE,
572                 .pc_xdrressize = ST+FH+AT,
573         },
574         [NFSPROC_READLINK] = {
575                 .pc_func = (svc_procfunc) nfsd_proc_readlink,
576                 .pc_decode = (kxdrproc_t) nfssvc_decode_readlinkargs,
577                 .pc_encode = (kxdrproc_t) nfssvc_encode_readlinkres,
578                 .pc_argsize = sizeof(struct nfsd_readlinkargs),
579                 .pc_ressize = sizeof(struct nfsd_readlinkres),
580                 .pc_cachetype = RC_NOCACHE,
581                 .pc_xdrressize = ST+1+NFS_MAXPATHLEN/4,
582         },
583         [NFSPROC_READ] = {
584                 .pc_func = (svc_procfunc) nfsd_proc_read,
585                 .pc_decode = (kxdrproc_t) nfssvc_decode_readargs,
586                 .pc_encode = (kxdrproc_t) nfssvc_encode_readres,
587                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
588                 .pc_argsize = sizeof(struct nfsd_readargs),
589                 .pc_ressize = sizeof(struct nfsd_readres),
590                 .pc_cachetype = RC_NOCACHE,
591                 .pc_xdrressize = ST+AT+1+NFSSVC_MAXBLKSIZE_V2/4,
592         },
593         [NFSPROC_WRITECACHE] = {
594                 .pc_decode = (kxdrproc_t) nfssvc_decode_void,
595                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
596                 .pc_argsize = sizeof(struct nfsd_void),
597                 .pc_ressize = sizeof(struct nfsd_void),
598                 .pc_cachetype = RC_NOCACHE,
599                 .pc_xdrressize = ST,
600         },
601         [NFSPROC_WRITE] = {
602                 .pc_func = (svc_procfunc) nfsd_proc_write,
603                 .pc_decode = (kxdrproc_t) nfssvc_decode_writeargs,
604                 .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
605                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
606                 .pc_argsize = sizeof(struct nfsd_writeargs),
607                 .pc_ressize = sizeof(struct nfsd_attrstat),
608                 .pc_cachetype = RC_REPLBUFF,
609                 .pc_xdrressize = ST+AT,
610         },
611         [NFSPROC_CREATE] = {
612                 .pc_func = (svc_procfunc) nfsd_proc_create,
613                 .pc_decode = (kxdrproc_t) nfssvc_decode_createargs,
614                 .pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
615                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
616                 .pc_argsize = sizeof(struct nfsd_createargs),
617                 .pc_ressize = sizeof(struct nfsd_diropres),
618                 .pc_cachetype = RC_REPLBUFF,
619                 .pc_xdrressize = ST+FH+AT,
620         },
621         [NFSPROC_REMOVE] = {
622                 .pc_func = (svc_procfunc) nfsd_proc_remove,
623                 .pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
624                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
625                 .pc_argsize = sizeof(struct nfsd_diropargs),
626                 .pc_ressize = sizeof(struct nfsd_void),
627                 .pc_cachetype = RC_REPLSTAT,
628                 .pc_xdrressize = ST,
629         },
630         [NFSPROC_RENAME] = {
631                 .pc_func = (svc_procfunc) nfsd_proc_rename,
632                 .pc_decode = (kxdrproc_t) nfssvc_decode_renameargs,
633                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
634                 .pc_argsize = sizeof(struct nfsd_renameargs),
635                 .pc_ressize = sizeof(struct nfsd_void),
636                 .pc_cachetype = RC_REPLSTAT,
637                 .pc_xdrressize = ST,
638         },
639         [NFSPROC_LINK] = {
640                 .pc_func = (svc_procfunc) nfsd_proc_link,
641                 .pc_decode = (kxdrproc_t) nfssvc_decode_linkargs,
642                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
643                 .pc_argsize = sizeof(struct nfsd_linkargs),
644                 .pc_ressize = sizeof(struct nfsd_void),
645                 .pc_cachetype = RC_REPLSTAT,
646                 .pc_xdrressize = ST,
647         },
648         [NFSPROC_SYMLINK] = {
649                 .pc_func = (svc_procfunc) nfsd_proc_symlink,
650                 .pc_decode = (kxdrproc_t) nfssvc_decode_symlinkargs,
651                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
652                 .pc_argsize = sizeof(struct nfsd_symlinkargs),
653                 .pc_ressize = sizeof(struct nfsd_void),
654                 .pc_cachetype = RC_REPLSTAT,
655                 .pc_xdrressize = ST,
656         },
657         [NFSPROC_MKDIR] = {
658                 .pc_func = (svc_procfunc) nfsd_proc_mkdir,
659                 .pc_decode = (kxdrproc_t) nfssvc_decode_createargs,
660                 .pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
661                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
662                 .pc_argsize = sizeof(struct nfsd_createargs),
663                 .pc_ressize = sizeof(struct nfsd_diropres),
664                 .pc_cachetype = RC_REPLBUFF,
665                 .pc_xdrressize = ST+FH+AT,
666         },
667         [NFSPROC_RMDIR] = {
668                 .pc_func = (svc_procfunc) nfsd_proc_rmdir,
669                 .pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
670                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
671                 .pc_argsize = sizeof(struct nfsd_diropargs),
672                 .pc_ressize = sizeof(struct nfsd_void),
673                 .pc_cachetype = RC_REPLSTAT,
674                 .pc_xdrressize = ST,
675         },
676         [NFSPROC_READDIR] = {
677                 .pc_func = (svc_procfunc) nfsd_proc_readdir,
678                 .pc_decode = (kxdrproc_t) nfssvc_decode_readdirargs,
679                 .pc_encode = (kxdrproc_t) nfssvc_encode_readdirres,
680                 .pc_argsize = sizeof(struct nfsd_readdirargs),
681                 .pc_ressize = sizeof(struct nfsd_readdirres),
682                 .pc_cachetype = RC_NOCACHE,
683         },
684         [NFSPROC_STATFS] = {
685                 .pc_func = (svc_procfunc) nfsd_proc_statfs,
686                 .pc_decode = (kxdrproc_t) nfssvc_decode_fhandle,
687                 .pc_encode = (kxdrproc_t) nfssvc_encode_statfsres,
688                 .pc_argsize = sizeof(struct nfsd_fhandle),
689                 .pc_ressize = sizeof(struct nfsd_statfsres),
690                 .pc_cachetype = RC_NOCACHE,
691                 .pc_xdrressize = ST+5,
692         },
693 };
694 
695 
696 struct svc_version      nfsd_version2 = {
697                 .vs_vers        = 2,
698                 .vs_nproc       = 18,
699                 .vs_proc        = nfsd_procedures2,
700                 .vs_dispatch    = nfsd_dispatch,
701                 .vs_xdrsize     = NFS2_SVC_XDRSIZE,
702 };
703 
704 /*
705  * Map errnos to NFS errnos.
706  */
707 __be32
708 nfserrno (int errno)
709 {
710         static struct {
711                 __be32  nfserr;
712                 int     syserr;
713         } nfs_errtbl[] = {
714                 { nfs_ok, 0 },
715                 { nfserr_perm, -EPERM },
716                 { nfserr_noent, -ENOENT },
717                 { nfserr_io, -EIO },
718                 { nfserr_nxio, -ENXIO },
719                 { nfserr_acces, -EACCES },
720                 { nfserr_exist, -EEXIST },
721                 { nfserr_xdev, -EXDEV },
722                 { nfserr_mlink, -EMLINK },
723                 { nfserr_nodev, -ENODEV },
724                 { nfserr_notdir, -ENOTDIR },
725                 { nfserr_isdir, -EISDIR },
726                 { nfserr_inval, -EINVAL },
727                 { nfserr_fbig, -EFBIG },
728                 { nfserr_nospc, -ENOSPC },
729                 { nfserr_rofs, -EROFS },
730                 { nfserr_mlink, -EMLINK },
731                 { nfserr_nametoolong, -ENAMETOOLONG },
732                 { nfserr_notempty, -ENOTEMPTY },
733 #ifdef EDQUOT
734                 { nfserr_dquot, -EDQUOT },
735 #endif
736                 { nfserr_stale, -ESTALE },
737                 { nfserr_jukebox, -ETIMEDOUT },
738                 { nfserr_jukebox, -ERESTARTSYS },
739                 { nfserr_jukebox, -EAGAIN },
740                 { nfserr_jukebox, -EWOULDBLOCK },
741                 { nfserr_jukebox, -ENOMEM },
742                 { nfserr_io, -ETXTBSY },
743                 { nfserr_notsupp, -EOPNOTSUPP },
744                 { nfserr_toosmall, -ETOOSMALL },
745                 { nfserr_serverfault, -ESERVERFAULT },
746         };
747         int     i;
748 
749         for (i = 0; i < ARRAY_SIZE(nfs_errtbl); i++) {
750                 if (nfs_errtbl[i].syserr == errno)
751                         return nfs_errtbl[i].nfserr;
752         }
753         printk (KERN_INFO "nfsd: non-standard errno: %d\n", errno);
754         return nfserr_io;
755 }
756 
757 

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