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

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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         struct iattr *iap = &argp->attrs;
 63         struct svc_fh *fhp;
 64         __be32 nfserr;
 65 
 66         dprintk("nfsd: SETATTR  %s, valid=%x, size=%ld\n",
 67                 SVCFH_fmt(&argp->fh),
 68                 argp->attrs.ia_valid, (long) argp->attrs.ia_size);
 69 
 70         fhp = fh_copy(&resp->fh, &argp->fh);
 71 
 72         /*
 73          * NFSv2 does not differentiate between "set-[ac]time-to-now"
 74          * which only requires access, and "set-[ac]time-to-X" which
 75          * requires ownership.
 76          * So if it looks like it might be "set both to the same time which
 77          * is close to now", and if inode_change_ok fails, then we
 78          * convert to "set to now" instead of "set to explicit time"
 79          *
 80          * We only call inode_change_ok as the last test as technically
 81          * it is not an interface that we should be using.
 82          */
 83 #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
 84 #define MAX_TOUCH_TIME_ERROR (30*60)
 85         if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET &&
 86             iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) {
 87                 /*
 88                  * Looks probable.
 89                  *
 90                  * Now just make sure time is in the right ballpark.
 91                  * Solaris, at least, doesn't seem to care what the time
 92                  * request is.  We require it be within 30 minutes of now.
 93                  */
 94                 time_t delta = iap->ia_atime.tv_sec - get_seconds();
 95                 struct inode *inode;
 96 
 97                 nfserr = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP);
 98                 if (nfserr)
 99                         goto done;
100                 inode = d_inode(fhp->fh_dentry);
101 
102                 if (delta < 0)
103                         delta = -delta;
104                 if (delta < MAX_TOUCH_TIME_ERROR &&
105                     inode_change_ok(inode, iap) != 0) {
106                         /*
107                          * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME.
108                          * This will cause notify_change to set these times
109                          * to "now"
110                          */
111                         iap->ia_valid &= ~BOTH_TIME_SET;
112                 }
113         }
114 
115         nfserr = nfsd_setattr(rqstp, fhp, iap, 0, (time_t)0);
116 done:
117         return nfsd_return_attrs(nfserr, resp);
118 }
119 
120 /*
121  * Look up a path name component
122  * Note: the dentry in the resp->fh may be negative if the file
123  * doesn't exist yet.
124  * N.B. After this call resp->fh needs an fh_put
125  */
126 static __be32
127 nfsd_proc_lookup(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
128                                          struct nfsd_diropres  *resp)
129 {
130         __be32  nfserr;
131 
132         dprintk("nfsd: LOOKUP   %s %.*s\n",
133                 SVCFH_fmt(&argp->fh), argp->len, argp->name);
134 
135         fh_init(&resp->fh, NFS_FHSIZE);
136         nfserr = nfsd_lookup(rqstp, &argp->fh, argp->name, argp->len,
137                                  &resp->fh);
138 
139         fh_put(&argp->fh);
140         return nfsd_return_dirop(nfserr, resp);
141 }
142 
143 /*
144  * Read a symlink.
145  */
146 static __be32
147 nfsd_proc_readlink(struct svc_rqst *rqstp, struct nfsd_readlinkargs *argp,
148                                            struct nfsd_readlinkres *resp)
149 {
150         __be32  nfserr;
151 
152         dprintk("nfsd: READLINK %s\n", SVCFH_fmt(&argp->fh));
153 
154         /* Read the symlink. */
155         resp->len = NFS_MAXPATHLEN;
156         nfserr = nfsd_readlink(rqstp, &argp->fh, argp->buffer, &resp->len);
157 
158         fh_put(&argp->fh);
159         return nfserr;
160 }
161 
162 /*
163  * Read a portion of a file.
164  * N.B. After this call resp->fh needs an fh_put
165  */
166 static __be32
167 nfsd_proc_read(struct svc_rqst *rqstp, struct nfsd_readargs *argp,
168                                        struct nfsd_readres  *resp)
169 {
170         __be32  nfserr;
171 
172         dprintk("nfsd: READ    %s %d bytes at %d\n",
173                 SVCFH_fmt(&argp->fh),
174                 argp->count, argp->offset);
175 
176         /* Obtain buffer pointer for payload. 19 is 1 word for
177          * status, 17 words for fattr, and 1 word for the byte count.
178          */
179 
180         if (NFSSVC_MAXBLKSIZE_V2 < argp->count) {
181                 char buf[RPC_MAX_ADDRBUFLEN];
182                 printk(KERN_NOTICE
183                         "oversized read request from %s (%d bytes)\n",
184                                 svc_print_addr(rqstp, buf, sizeof(buf)),
185                                 argp->count);
186                 argp->count = NFSSVC_MAXBLKSIZE_V2;
187         }
188         svc_reserve_auth(rqstp, (19<<2) + argp->count + 4);
189 
190         resp->count = argp->count;
191         nfserr = nfsd_read(rqstp, fh_copy(&resp->fh, &argp->fh),
192                                   argp->offset,
193                                   rqstp->rq_vec, argp->vlen,
194                                   &resp->count);
195 
196         if (nfserr) return nfserr;
197         return fh_getattr(&resp->fh, &resp->stat);
198 }
199 
200 /*
201  * Write data to a file
202  * N.B. After this call resp->fh needs an fh_put
203  */
204 static __be32
205 nfsd_proc_write(struct svc_rqst *rqstp, struct nfsd_writeargs *argp,
206                                         struct nfsd_attrstat  *resp)
207 {
208         __be32  nfserr;
209         int     stable = 1;
210         unsigned long cnt = argp->len;
211 
212         dprintk("nfsd: WRITE    %s %d bytes at %d\n",
213                 SVCFH_fmt(&argp->fh),
214                 argp->len, argp->offset);
215 
216         nfserr = nfsd_write(rqstp, fh_copy(&resp->fh, &argp->fh), NULL,
217                                    argp->offset,
218                                    rqstp->rq_vec, argp->vlen,
219                                    &cnt,
220                                    &stable);
221         return nfsd_return_attrs(nfserr, resp);
222 }
223 
224 /*
225  * CREATE processing is complicated. The keyword here is `overloaded.'
226  * The parent directory is kept locked between the check for existence
227  * and the actual create() call in compliance with VFS protocols.
228  * N.B. After this call _both_ argp->fh and resp->fh need an fh_put
229  */
230 static __be32
231 nfsd_proc_create(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
232                                          struct nfsd_diropres   *resp)
233 {
234         svc_fh          *dirfhp = &argp->fh;
235         svc_fh          *newfhp = &resp->fh;
236         struct iattr    *attr = &argp->attrs;
237         struct inode    *inode;
238         struct dentry   *dchild;
239         int             type, mode;
240         __be32          nfserr;
241         int             hosterr;
242         dev_t           rdev = 0, wanted = new_decode_dev(attr->ia_size);
243 
244         dprintk("nfsd: CREATE   %s %.*s\n",
245                 SVCFH_fmt(dirfhp), argp->len, argp->name);
246 
247         /* First verify the parent file handle */
248         nfserr = fh_verify(rqstp, dirfhp, S_IFDIR, NFSD_MAY_EXEC);
249         if (nfserr)
250                 goto done; /* must fh_put dirfhp even on error */
251 
252         /* Check for NFSD_MAY_WRITE in nfsd_create if necessary */
253 
254         nfserr = nfserr_acces;
255         if (!argp->len)
256                 goto done;
257         nfserr = nfserr_exist;
258         if (isdotent(argp->name, argp->len))
259                 goto done;
260         hosterr = fh_want_write(dirfhp);
261         if (hosterr) {
262                 nfserr = nfserrno(hosterr);
263                 goto done;
264         }
265 
266         fh_lock_nested(dirfhp, I_MUTEX_PARENT);
267         dchild = lookup_one_len(argp->name, dirfhp->fh_dentry, argp->len);
268         if (IS_ERR(dchild)) {
269                 nfserr = nfserrno(PTR_ERR(dchild));
270                 goto out_unlock;
271         }
272         fh_init(newfhp, NFS_FHSIZE);
273         nfserr = fh_compose(newfhp, dirfhp->fh_export, dchild, dirfhp);
274         if (!nfserr && !dchild->d_inode)
275                 nfserr = nfserr_noent;
276         dput(dchild);
277         if (nfserr) {
278                 if (nfserr != nfserr_noent)
279                         goto out_unlock;
280                 /*
281                  * If the new file handle wasn't verified, we can't tell
282                  * whether the file exists or not. Time to bail ...
283                  */
284                 nfserr = nfserr_acces;
285                 if (!newfhp->fh_dentry) {
286                         printk(KERN_WARNING 
287                                 "nfsd_proc_create: file handle not verified\n");
288                         goto out_unlock;
289                 }
290         }
291 
292         inode = newfhp->fh_dentry->d_inode;
293 
294         /* Unfudge the mode bits */
295         if (attr->ia_valid & ATTR_MODE) {
296                 type = attr->ia_mode & S_IFMT;
297                 mode = attr->ia_mode & ~S_IFMT;
298                 if (!type) {
299                         /* no type, so if target exists, assume same as that,
300                          * else assume a file */
301                         if (inode) {
302                                 type = inode->i_mode & S_IFMT;
303                                 switch(type) {
304                                 case S_IFCHR:
305                                 case S_IFBLK:
306                                         /* reserve rdev for later checking */
307                                         rdev = inode->i_rdev;
308                                         attr->ia_valid |= ATTR_SIZE;
309 
310                                         /* FALLTHROUGH */
311                                 case S_IFIFO:
312                                         /* this is probably a permission check..
313                                          * at least IRIX implements perm checking on
314                                          *   echo thing > device-special-file-or-pipe
315                                          * by doing a CREATE with type==0
316                                          */
317                                         nfserr = nfsd_permission(rqstp,
318                                                                  newfhp->fh_export,
319                                                                  newfhp->fh_dentry,
320                                                                  NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS);
321                                         if (nfserr && nfserr != nfserr_rofs)
322                                                 goto out_unlock;
323                                 }
324                         } else
325                                 type = S_IFREG;
326                 }
327         } else if (inode) {
328                 type = inode->i_mode & S_IFMT;
329                 mode = inode->i_mode & ~S_IFMT;
330         } else {
331                 type = S_IFREG;
332                 mode = 0;       /* ??? */
333         }
334 
335         attr->ia_valid |= ATTR_MODE;
336         attr->ia_mode = mode;
337 
338         /* Special treatment for non-regular files according to the
339          * gospel of sun micro
340          */
341         if (type != S_IFREG) {
342                 if (type != S_IFBLK && type != S_IFCHR) {
343                         rdev = 0;
344                 } else if (type == S_IFCHR && !(attr->ia_valid & ATTR_SIZE)) {
345                         /* If you think you've seen the worst, grok this. */
346                         type = S_IFIFO;
347                 } else {
348                         /* Okay, char or block special */
349                         if (!rdev)
350                                 rdev = wanted;
351                 }
352 
353                 /* we've used the SIZE information, so discard it */
354                 attr->ia_valid &= ~ATTR_SIZE;
355 
356                 /* Make sure the type and device matches */
357                 nfserr = nfserr_exist;
358                 if (inode && type != (inode->i_mode & S_IFMT))
359                         goto out_unlock;
360         }
361 
362         nfserr = 0;
363         if (!inode) {
364                 /* File doesn't exist. Create it and set attrs */
365                 nfserr = nfsd_create(rqstp, dirfhp, argp->name, argp->len,
366                                         attr, type, rdev, newfhp);
367         } else if (type == S_IFREG) {
368                 dprintk("nfsd:   existing %s, valid=%x, size=%ld\n",
369                         argp->name, attr->ia_valid, (long) attr->ia_size);
370                 /* File already exists. We ignore all attributes except
371                  * size, so that creat() behaves exactly like
372                  * open(..., O_CREAT|O_TRUNC|O_WRONLY).
373                  */
374                 attr->ia_valid &= ATTR_SIZE;
375                 if (attr->ia_valid)
376                         nfserr = nfsd_setattr(rqstp, newfhp, attr, 0, (time_t)0);
377         }
378 
379 out_unlock:
380         /* We don't really need to unlock, as fh_put does it. */
381         fh_unlock(dirfhp);
382         fh_drop_write(dirfhp);
383 done:
384         fh_put(dirfhp);
385         return nfsd_return_dirop(nfserr, resp);
386 }
387 
388 static __be32
389 nfsd_proc_remove(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
390                                          void                  *resp)
391 {
392         __be32  nfserr;
393 
394         dprintk("nfsd: REMOVE   %s %.*s\n", SVCFH_fmt(&argp->fh),
395                 argp->len, argp->name);
396 
397         /* Unlink. -SIFDIR means file must not be a directory */
398         nfserr = nfsd_unlink(rqstp, &argp->fh, -S_IFDIR, argp->name, argp->len);
399         fh_put(&argp->fh);
400         return nfserr;
401 }
402 
403 static __be32
404 nfsd_proc_rename(struct svc_rqst *rqstp, struct nfsd_renameargs *argp,
405                                          void                   *resp)
406 {
407         __be32  nfserr;
408 
409         dprintk("nfsd: RENAME   %s %.*s -> \n",
410                 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname);
411         dprintk("nfsd:        ->  %s %.*s\n",
412                 SVCFH_fmt(&argp->tfh), argp->tlen, argp->tname);
413 
414         nfserr = nfsd_rename(rqstp, &argp->ffh, argp->fname, argp->flen,
415                                     &argp->tfh, argp->tname, argp->tlen);
416         fh_put(&argp->ffh);
417         fh_put(&argp->tfh);
418         return nfserr;
419 }
420 
421 static __be32
422 nfsd_proc_link(struct svc_rqst *rqstp, struct nfsd_linkargs *argp,
423                                 void                        *resp)
424 {
425         __be32  nfserr;
426 
427         dprintk("nfsd: LINK     %s ->\n",
428                 SVCFH_fmt(&argp->ffh));
429         dprintk("nfsd:    %s %.*s\n",
430                 SVCFH_fmt(&argp->tfh),
431                 argp->tlen,
432                 argp->tname);
433 
434         nfserr = nfsd_link(rqstp, &argp->tfh, argp->tname, argp->tlen,
435                                   &argp->ffh);
436         fh_put(&argp->ffh);
437         fh_put(&argp->tfh);
438         return nfserr;
439 }
440 
441 static __be32
442 nfsd_proc_symlink(struct svc_rqst *rqstp, struct nfsd_symlinkargs *argp,
443                                           void                    *resp)
444 {
445         struct svc_fh   newfh;
446         __be32          nfserr;
447 
448         dprintk("nfsd: SYMLINK  %s %.*s -> %.*s\n",
449                 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname,
450                 argp->tlen, argp->tname);
451 
452         fh_init(&newfh, NFS_FHSIZE);
453         /*
454          * Crazy hack: the request fits in a page, and already-decoded
455          * attributes follow argp->tname, so it's safe to just write a
456          * null to ensure it's null-terminated:
457          */
458         argp->tname[argp->tlen] = '\0';
459         nfserr = nfsd_symlink(rqstp, &argp->ffh, argp->fname, argp->flen,
460                                                  argp->tname, &newfh);
461 
462         fh_put(&argp->ffh);
463         fh_put(&newfh);
464         return nfserr;
465 }
466 
467 /*
468  * Make directory. This operation is not idempotent.
469  * N.B. After this call resp->fh needs an fh_put
470  */
471 static __be32
472 nfsd_proc_mkdir(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
473                                         struct nfsd_diropres   *resp)
474 {
475         __be32  nfserr;
476 
477         dprintk("nfsd: MKDIR    %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
478 
479         if (resp->fh.fh_dentry) {
480                 printk(KERN_WARNING
481                         "nfsd_proc_mkdir: response already verified??\n");
482         }
483 
484         argp->attrs.ia_valid &= ~ATTR_SIZE;
485         fh_init(&resp->fh, NFS_FHSIZE);
486         nfserr = nfsd_create(rqstp, &argp->fh, argp->name, argp->len,
487                                     &argp->attrs, S_IFDIR, 0, &resp->fh);
488         fh_put(&argp->fh);
489         return nfsd_return_dirop(nfserr, resp);
490 }
491 
492 /*
493  * Remove a directory
494  */
495 static __be32
496 nfsd_proc_rmdir(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
497                                         void                  *resp)
498 {
499         __be32  nfserr;
500 
501         dprintk("nfsd: RMDIR    %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
502 
503         nfserr = nfsd_unlink(rqstp, &argp->fh, S_IFDIR, argp->name, argp->len);
504         fh_put(&argp->fh);
505         return nfserr;
506 }
507 
508 /*
509  * Read a portion of a directory.
510  */
511 static __be32
512 nfsd_proc_readdir(struct svc_rqst *rqstp, struct nfsd_readdirargs *argp,
513                                           struct nfsd_readdirres  *resp)
514 {
515         int             count;
516         __be32          nfserr;
517         loff_t          offset;
518 
519         dprintk("nfsd: READDIR  %s %d bytes at %d\n",
520                 SVCFH_fmt(&argp->fh),           
521                 argp->count, argp->cookie);
522 
523         /* Shrink to the client read size */
524         count = (argp->count >> 2) - 2;
525 
526         /* Make sure we've room for the NULL ptr & eof flag */
527         count -= 2;
528         if (count < 0)
529                 count = 0;
530 
531         resp->buffer = argp->buffer;
532         resp->offset = NULL;
533         resp->buflen = count;
534         resp->common.err = nfs_ok;
535         /* Read directory and encode entries on the fly */
536         offset = argp->cookie;
537         nfserr = nfsd_readdir(rqstp, &argp->fh, &offset, 
538                               &resp->common, nfssvc_encode_entry);
539 
540         resp->count = resp->buffer - argp->buffer;
541         if (resp->offset)
542                 *resp->offset = htonl(offset);
543 
544         fh_put(&argp->fh);
545         return nfserr;
546 }
547 
548 /*
549  * Get file system info
550  */
551 static __be32
552 nfsd_proc_statfs(struct svc_rqst * rqstp, struct nfsd_fhandle   *argp,
553                                           struct nfsd_statfsres *resp)
554 {
555         __be32  nfserr;
556 
557         dprintk("nfsd: STATFS   %s\n", SVCFH_fmt(&argp->fh));
558 
559         nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats,
560                         NFSD_MAY_BYPASS_GSS_ON_ROOT);
561         fh_put(&argp->fh);
562         return nfserr;
563 }
564 
565 /*
566  * NFSv2 Server procedures.
567  * Only the results of non-idempotent operations are cached.
568  */
569 struct nfsd_void { int dummy; };
570 
571 #define ST 1            /* status */
572 #define FH 8            /* filehandle */
573 #define AT 18           /* attributes */
574 
575 static struct svc_procedure             nfsd_procedures2[18] = {
576         [NFSPROC_NULL] = {
577                 .pc_func = (svc_procfunc) nfsd_proc_null,
578                 .pc_decode = (kxdrproc_t) nfssvc_decode_void,
579                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
580                 .pc_argsize = sizeof(struct nfsd_void),
581                 .pc_ressize = sizeof(struct nfsd_void),
582                 .pc_cachetype = RC_NOCACHE,
583                 .pc_xdrressize = ST,
584         },
585         [NFSPROC_GETATTR] = {
586                 .pc_func = (svc_procfunc) nfsd_proc_getattr,
587                 .pc_decode = (kxdrproc_t) nfssvc_decode_fhandle,
588                 .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
589                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
590                 .pc_argsize = sizeof(struct nfsd_fhandle),
591                 .pc_ressize = sizeof(struct nfsd_attrstat),
592                 .pc_cachetype = RC_NOCACHE,
593                 .pc_xdrressize = ST+AT,
594         },
595         [NFSPROC_SETATTR] = {
596                 .pc_func = (svc_procfunc) nfsd_proc_setattr,
597                 .pc_decode = (kxdrproc_t) nfssvc_decode_sattrargs,
598                 .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
599                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
600                 .pc_argsize = sizeof(struct nfsd_sattrargs),
601                 .pc_ressize = sizeof(struct nfsd_attrstat),
602                 .pc_cachetype = RC_REPLBUFF,
603                 .pc_xdrressize = ST+AT,
604         },
605         [NFSPROC_ROOT] = {
606                 .pc_decode = (kxdrproc_t) nfssvc_decode_void,
607                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
608                 .pc_argsize = sizeof(struct nfsd_void),
609                 .pc_ressize = sizeof(struct nfsd_void),
610                 .pc_cachetype = RC_NOCACHE,
611                 .pc_xdrressize = ST,
612         },
613         [NFSPROC_LOOKUP] = {
614                 .pc_func = (svc_procfunc) nfsd_proc_lookup,
615                 .pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
616                 .pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
617                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
618                 .pc_argsize = sizeof(struct nfsd_diropargs),
619                 .pc_ressize = sizeof(struct nfsd_diropres),
620                 .pc_cachetype = RC_NOCACHE,
621                 .pc_xdrressize = ST+FH+AT,
622         },
623         [NFSPROC_READLINK] = {
624                 .pc_func = (svc_procfunc) nfsd_proc_readlink,
625                 .pc_decode = (kxdrproc_t) nfssvc_decode_readlinkargs,
626                 .pc_encode = (kxdrproc_t) nfssvc_encode_readlinkres,
627                 .pc_argsize = sizeof(struct nfsd_readlinkargs),
628                 .pc_ressize = sizeof(struct nfsd_readlinkres),
629                 .pc_cachetype = RC_NOCACHE,
630                 .pc_xdrressize = ST+1+NFS_MAXPATHLEN/4,
631         },
632         [NFSPROC_READ] = {
633                 .pc_func = (svc_procfunc) nfsd_proc_read,
634                 .pc_decode = (kxdrproc_t) nfssvc_decode_readargs,
635                 .pc_encode = (kxdrproc_t) nfssvc_encode_readres,
636                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
637                 .pc_argsize = sizeof(struct nfsd_readargs),
638                 .pc_ressize = sizeof(struct nfsd_readres),
639                 .pc_cachetype = RC_NOCACHE,
640                 .pc_xdrressize = ST+AT+1+NFSSVC_MAXBLKSIZE_V2/4,
641         },
642         [NFSPROC_WRITECACHE] = {
643                 .pc_decode = (kxdrproc_t) nfssvc_decode_void,
644                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
645                 .pc_argsize = sizeof(struct nfsd_void),
646                 .pc_ressize = sizeof(struct nfsd_void),
647                 .pc_cachetype = RC_NOCACHE,
648                 .pc_xdrressize = ST,
649         },
650         [NFSPROC_WRITE] = {
651                 .pc_func = (svc_procfunc) nfsd_proc_write,
652                 .pc_decode = (kxdrproc_t) nfssvc_decode_writeargs,
653                 .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
654                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
655                 .pc_argsize = sizeof(struct nfsd_writeargs),
656                 .pc_ressize = sizeof(struct nfsd_attrstat),
657                 .pc_cachetype = RC_REPLBUFF,
658                 .pc_xdrressize = ST+AT,
659         },
660         [NFSPROC_CREATE] = {
661                 .pc_func = (svc_procfunc) nfsd_proc_create,
662                 .pc_decode = (kxdrproc_t) nfssvc_decode_createargs,
663                 .pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
664                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
665                 .pc_argsize = sizeof(struct nfsd_createargs),
666                 .pc_ressize = sizeof(struct nfsd_diropres),
667                 .pc_cachetype = RC_REPLBUFF,
668                 .pc_xdrressize = ST+FH+AT,
669         },
670         [NFSPROC_REMOVE] = {
671                 .pc_func = (svc_procfunc) nfsd_proc_remove,
672                 .pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
673                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
674                 .pc_argsize = sizeof(struct nfsd_diropargs),
675                 .pc_ressize = sizeof(struct nfsd_void),
676                 .pc_cachetype = RC_REPLSTAT,
677                 .pc_xdrressize = ST,
678         },
679         [NFSPROC_RENAME] = {
680                 .pc_func = (svc_procfunc) nfsd_proc_rename,
681                 .pc_decode = (kxdrproc_t) nfssvc_decode_renameargs,
682                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
683                 .pc_argsize = sizeof(struct nfsd_renameargs),
684                 .pc_ressize = sizeof(struct nfsd_void),
685                 .pc_cachetype = RC_REPLSTAT,
686                 .pc_xdrressize = ST,
687         },
688         [NFSPROC_LINK] = {
689                 .pc_func = (svc_procfunc) nfsd_proc_link,
690                 .pc_decode = (kxdrproc_t) nfssvc_decode_linkargs,
691                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
692                 .pc_argsize = sizeof(struct nfsd_linkargs),
693                 .pc_ressize = sizeof(struct nfsd_void),
694                 .pc_cachetype = RC_REPLSTAT,
695                 .pc_xdrressize = ST,
696         },
697         [NFSPROC_SYMLINK] = {
698                 .pc_func = (svc_procfunc) nfsd_proc_symlink,
699                 .pc_decode = (kxdrproc_t) nfssvc_decode_symlinkargs,
700                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
701                 .pc_argsize = sizeof(struct nfsd_symlinkargs),
702                 .pc_ressize = sizeof(struct nfsd_void),
703                 .pc_cachetype = RC_REPLSTAT,
704                 .pc_xdrressize = ST,
705         },
706         [NFSPROC_MKDIR] = {
707                 .pc_func = (svc_procfunc) nfsd_proc_mkdir,
708                 .pc_decode = (kxdrproc_t) nfssvc_decode_createargs,
709                 .pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
710                 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
711                 .pc_argsize = sizeof(struct nfsd_createargs),
712                 .pc_ressize = sizeof(struct nfsd_diropres),
713                 .pc_cachetype = RC_REPLBUFF,
714                 .pc_xdrressize = ST+FH+AT,
715         },
716         [NFSPROC_RMDIR] = {
717                 .pc_func = (svc_procfunc) nfsd_proc_rmdir,
718                 .pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
719                 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
720                 .pc_argsize = sizeof(struct nfsd_diropargs),
721                 .pc_ressize = sizeof(struct nfsd_void),
722                 .pc_cachetype = RC_REPLSTAT,
723                 .pc_xdrressize = ST,
724         },
725         [NFSPROC_READDIR] = {
726                 .pc_func = (svc_procfunc) nfsd_proc_readdir,
727                 .pc_decode = (kxdrproc_t) nfssvc_decode_readdirargs,
728                 .pc_encode = (kxdrproc_t) nfssvc_encode_readdirres,
729                 .pc_argsize = sizeof(struct nfsd_readdirargs),
730                 .pc_ressize = sizeof(struct nfsd_readdirres),
731                 .pc_cachetype = RC_NOCACHE,
732         },
733         [NFSPROC_STATFS] = {
734                 .pc_func = (svc_procfunc) nfsd_proc_statfs,
735                 .pc_decode = (kxdrproc_t) nfssvc_decode_fhandle,
736                 .pc_encode = (kxdrproc_t) nfssvc_encode_statfsres,
737                 .pc_argsize = sizeof(struct nfsd_fhandle),
738                 .pc_ressize = sizeof(struct nfsd_statfsres),
739                 .pc_cachetype = RC_NOCACHE,
740                 .pc_xdrressize = ST+5,
741         },
742 };
743 
744 
745 struct svc_version      nfsd_version2 = {
746                 .vs_vers        = 2,
747                 .vs_nproc       = 18,
748                 .vs_proc        = nfsd_procedures2,
749                 .vs_dispatch    = nfsd_dispatch,
750                 .vs_xdrsize     = NFS2_SVC_XDRSIZE,
751 };
752 
753 /*
754  * Map errnos to NFS errnos.
755  */
756 __be32
757 nfserrno (int errno)
758 {
759         static struct {
760                 __be32  nfserr;
761                 int     syserr;
762         } nfs_errtbl[] = {
763                 { nfs_ok, 0 },
764                 { nfserr_perm, -EPERM },
765                 { nfserr_noent, -ENOENT },
766                 { nfserr_io, -EIO },
767                 { nfserr_nxio, -ENXIO },
768                 { nfserr_fbig, -E2BIG },
769                 { nfserr_acces, -EACCES },
770                 { nfserr_exist, -EEXIST },
771                 { nfserr_xdev, -EXDEV },
772                 { nfserr_mlink, -EMLINK },
773                 { nfserr_nodev, -ENODEV },
774                 { nfserr_notdir, -ENOTDIR },
775                 { nfserr_isdir, -EISDIR },
776                 { nfserr_inval, -EINVAL },
777                 { nfserr_fbig, -EFBIG },
778                 { nfserr_nospc, -ENOSPC },
779                 { nfserr_rofs, -EROFS },
780                 { nfserr_mlink, -EMLINK },
781                 { nfserr_nametoolong, -ENAMETOOLONG },
782                 { nfserr_notempty, -ENOTEMPTY },
783 #ifdef EDQUOT
784                 { nfserr_dquot, -EDQUOT },
785 #endif
786                 { nfserr_stale, -ESTALE },
787                 { nfserr_jukebox, -ETIMEDOUT },
788                 { nfserr_jukebox, -ERESTARTSYS },
789                 { nfserr_jukebox, -EAGAIN },
790                 { nfserr_jukebox, -EWOULDBLOCK },
791                 { nfserr_jukebox, -ENOMEM },
792                 { nfserr_io, -ETXTBSY },
793                 { nfserr_notsupp, -EOPNOTSUPP },
794                 { nfserr_toosmall, -ETOOSMALL },
795                 { nfserr_serverfault, -ESERVERFAULT },
796                 { nfserr_serverfault, -ENFILE },
797         };
798         int     i;
799 
800         for (i = 0; i < ARRAY_SIZE(nfs_errtbl); i++) {
801                 if (nfs_errtbl[i].syserr == errno)
802                         return nfs_errtbl[i].nfserr;
803         }
804         WARN(1, "nfsd: non-standard errno: %d\n", errno);
805         return nfserr_io;
806 }
807 
808 

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