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

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * Process version 2 NFS requests.
  4  *
  5  * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
  6  */
  7 
  8 #include <linux/namei.h>
  9 
 10 #include "cache.h"
 11 #include "xdr.h"
 12 #include "vfs.h"
 13 
 14 typedef struct svc_rqst svc_rqst;
 15 typedef struct svc_buf  svc_buf;
 16 
 17 #define NFSDDBG_FACILITY                NFSDDBG_PROC
 18 
 19 
 20 static __be32
 21 nfsd_proc_null(struct svc_rqst *rqstp)
 22 {
 23         return nfs_ok;
 24 }
 25 
 26 static __be32
 27 nfsd_return_attrs(__be32 err, struct nfsd_attrstat *resp)
 28 {
 29         if (err) return err;
 30         return fh_getattr(&resp->fh, &resp->stat);
 31 }
 32 static __be32
 33 nfsd_return_dirop(__be32 err, struct nfsd_diropres *resp)
 34 {
 35         if (err) return err;
 36         return fh_getattr(&resp->fh, &resp->stat);
 37 }
 38 /*
 39  * Get a file's attributes
 40  * N.B. After this call resp->fh needs an fh_put
 41  */
 42 static __be32
 43 nfsd_proc_getattr(struct svc_rqst *rqstp)
 44 {
 45         struct nfsd_fhandle *argp = rqstp->rq_argp;
 46         struct nfsd_attrstat *resp = rqstp->rq_resp;
 47         __be32 nfserr;
 48         dprintk("nfsd: GETATTR  %s\n", SVCFH_fmt(&argp->fh));
 49 
 50         fh_copy(&resp->fh, &argp->fh);
 51         nfserr = fh_verify(rqstp, &resp->fh, 0,
 52                         NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
 53         return nfsd_return_attrs(nfserr, resp);
 54 }
 55 
 56 /*
 57  * Set a file's attributes
 58  * N.B. After this call resp->fh needs an fh_put
 59  */
 60 static __be32
 61 nfsd_proc_setattr(struct svc_rqst *rqstp)
 62 {
 63         struct nfsd_sattrargs *argp = rqstp->rq_argp;
 64         struct nfsd_attrstat *resp = rqstp->rq_resp;
 65         struct iattr *iap = &argp->attrs;
 66         struct svc_fh *fhp;
 67         __be32 nfserr;
 68 
 69         dprintk("nfsd: SETATTR  %s, valid=%x, size=%ld\n",
 70                 SVCFH_fmt(&argp->fh),
 71                 argp->attrs.ia_valid, (long) argp->attrs.ia_size);
 72 
 73         fhp = fh_copy(&resp->fh, &argp->fh);
 74 
 75         /*
 76          * NFSv2 does not differentiate between "set-[ac]time-to-now"
 77          * which only requires access, and "set-[ac]time-to-X" which
 78          * requires ownership.
 79          * So if it looks like it might be "set both to the same time which
 80          * is close to now", and if setattr_prepare fails, then we
 81          * convert to "set to now" instead of "set to explicit time"
 82          *
 83          * We only call setattr_prepare as the last test as technically
 84          * it is not an interface that we should be using.
 85          */
 86 #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
 87 #define MAX_TOUCH_TIME_ERROR (30*60)
 88         if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET &&
 89             iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) {
 90                 /*
 91                  * Looks probable.
 92                  *
 93                  * Now just make sure time is in the right ballpark.
 94                  * Solaris, at least, doesn't seem to care what the time
 95                  * request is.  We require it be within 30 minutes of now.
 96                  */
 97                 time64_t delta = iap->ia_atime.tv_sec - ktime_get_real_seconds();
 98 
 99                 nfserr = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP);
100                 if (nfserr)
101                         goto done;
102 
103                 if (delta < 0)
104                         delta = -delta;
105                 if (delta < MAX_TOUCH_TIME_ERROR &&
106                     setattr_prepare(fhp->fh_dentry, iap) != 0) {
107                         /*
108                          * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME.
109                          * This will cause notify_change to set these times
110                          * to "now"
111                          */
112                         iap->ia_valid &= ~BOTH_TIME_SET;
113                 }
114         }
115 
116         nfserr = nfsd_setattr(rqstp, fhp, iap, 0, (time64_t)0);
117 done:
118         return nfsd_return_attrs(nfserr, resp);
119 }
120 
121 /*
122  * Look up a path name component
123  * Note: the dentry in the resp->fh may be negative if the file
124  * doesn't exist yet.
125  * N.B. After this call resp->fh needs an fh_put
126  */
127 static __be32
128 nfsd_proc_lookup(struct svc_rqst *rqstp)
129 {
130         struct nfsd_diropargs *argp = rqstp->rq_argp;
131         struct nfsd_diropres *resp = rqstp->rq_resp;
132         __be32  nfserr;
133 
134         dprintk("nfsd: LOOKUP   %s %.*s\n",
135                 SVCFH_fmt(&argp->fh), argp->len, argp->name);
136 
137         fh_init(&resp->fh, NFS_FHSIZE);
138         nfserr = nfsd_lookup(rqstp, &argp->fh, argp->name, argp->len,
139                                  &resp->fh);
140 
141         fh_put(&argp->fh);
142         return nfsd_return_dirop(nfserr, resp);
143 }
144 
145 /*
146  * Read a symlink.
147  */
148 static __be32
149 nfsd_proc_readlink(struct svc_rqst *rqstp)
150 {
151         struct nfsd_readlinkargs *argp = rqstp->rq_argp;
152         struct nfsd_readlinkres *resp = rqstp->rq_resp;
153         __be32  nfserr;
154 
155         dprintk("nfsd: READLINK %s\n", SVCFH_fmt(&argp->fh));
156 
157         /* Read the symlink. */
158         resp->len = NFS_MAXPATHLEN;
159         nfserr = nfsd_readlink(rqstp, &argp->fh, argp->buffer, &resp->len);
160 
161         fh_put(&argp->fh);
162         return nfserr;
163 }
164 
165 /*
166  * Read a portion of a file.
167  * N.B. After this call resp->fh needs an fh_put
168  */
169 static __be32
170 nfsd_proc_read(struct svc_rqst *rqstp)
171 {
172         struct nfsd_readargs *argp = rqstp->rq_argp;
173         struct nfsd_readres *resp = rqstp->rq_resp;
174         __be32  nfserr;
175         u32 eof;
176 
177         dprintk("nfsd: READ    %s %d bytes at %d\n",
178                 SVCFH_fmt(&argp->fh),
179                 argp->count, argp->offset);
180 
181         /* Obtain buffer pointer for payload. 19 is 1 word for
182          * status, 17 words for fattr, and 1 word for the byte count.
183          */
184 
185         if (NFSSVC_MAXBLKSIZE_V2 < argp->count) {
186                 char buf[RPC_MAX_ADDRBUFLEN];
187                 printk(KERN_NOTICE
188                         "oversized read request from %s (%d bytes)\n",
189                                 svc_print_addr(rqstp, buf, sizeof(buf)),
190                                 argp->count);
191                 argp->count = NFSSVC_MAXBLKSIZE_V2;
192         }
193         svc_reserve_auth(rqstp, (19<<2) + argp->count + 4);
194 
195         resp->count = argp->count;
196         nfserr = nfsd_read(rqstp, fh_copy(&resp->fh, &argp->fh),
197                                   argp->offset,
198                                   rqstp->rq_vec, argp->vlen,
199                                   &resp->count,
200                                   &eof);
201 
202         if (nfserr) return nfserr;
203         return fh_getattr(&resp->fh, &resp->stat);
204 }
205 
206 /*
207  * Write data to a file
208  * N.B. After this call resp->fh needs an fh_put
209  */
210 static __be32
211 nfsd_proc_write(struct svc_rqst *rqstp)
212 {
213         struct nfsd_writeargs *argp = rqstp->rq_argp;
214         struct nfsd_attrstat *resp = rqstp->rq_resp;
215         __be32  nfserr;
216         unsigned long cnt = argp->len;
217         unsigned int nvecs;
218 
219         dprintk("nfsd: WRITE    %s %d bytes at %d\n",
220                 SVCFH_fmt(&argp->fh),
221                 argp->len, argp->offset);
222 
223         nvecs = svc_fill_write_vector(rqstp, rqstp->rq_arg.pages,
224                                       &argp->first, cnt);
225         if (!nvecs)
226                 return nfserr_io;
227         nfserr = nfsd_write(rqstp, fh_copy(&resp->fh, &argp->fh),
228                             argp->offset, rqstp->rq_vec, nvecs,
229                             &cnt, NFS_DATA_SYNC, NULL);
230         return nfsd_return_attrs(nfserr, resp);
231 }
232 
233 /*
234  * CREATE processing is complicated. The keyword here is `overloaded.'
235  * The parent directory is kept locked between the check for existence
236  * and the actual create() call in compliance with VFS protocols.
237  * N.B. After this call _both_ argp->fh and resp->fh need an fh_put
238  */
239 static __be32
240 nfsd_proc_create(struct svc_rqst *rqstp)
241 {
242         struct nfsd_createargs *argp = rqstp->rq_argp;
243         struct nfsd_diropres *resp = rqstp->rq_resp;
244         svc_fh          *dirfhp = &argp->fh;
245         svc_fh          *newfhp = &resp->fh;
246         struct iattr    *attr = &argp->attrs;
247         struct inode    *inode;
248         struct dentry   *dchild;
249         int             type, mode;
250         __be32          nfserr;
251         int             hosterr;
252         dev_t           rdev = 0, wanted = new_decode_dev(attr->ia_size);
253 
254         dprintk("nfsd: CREATE   %s %.*s\n",
255                 SVCFH_fmt(dirfhp), argp->len, argp->name);
256 
257         /* First verify the parent file handle */
258         nfserr = fh_verify(rqstp, dirfhp, S_IFDIR, NFSD_MAY_EXEC);
259         if (nfserr)
260                 goto done; /* must fh_put dirfhp even on error */
261 
262         /* Check for NFSD_MAY_WRITE in nfsd_create if necessary */
263 
264         nfserr = nfserr_exist;
265         if (isdotent(argp->name, argp->len))
266                 goto done;
267         hosterr = fh_want_write(dirfhp);
268         if (hosterr) {
269                 nfserr = nfserrno(hosterr);
270                 goto done;
271         }
272 
273         fh_lock_nested(dirfhp, I_MUTEX_PARENT);
274         dchild = lookup_one_len(argp->name, dirfhp->fh_dentry, argp->len);
275         if (IS_ERR(dchild)) {
276                 nfserr = nfserrno(PTR_ERR(dchild));
277                 goto out_unlock;
278         }
279         fh_init(newfhp, NFS_FHSIZE);
280         nfserr = fh_compose(newfhp, dirfhp->fh_export, dchild, dirfhp);
281         if (!nfserr && d_really_is_negative(dchild))
282                 nfserr = nfserr_noent;
283         dput(dchild);
284         if (nfserr) {
285                 if (nfserr != nfserr_noent)
286                         goto out_unlock;
287                 /*
288                  * If the new file handle wasn't verified, we can't tell
289                  * whether the file exists or not. Time to bail ...
290                  */
291                 nfserr = nfserr_acces;
292                 if (!newfhp->fh_dentry) {
293                         printk(KERN_WARNING 
294                                 "nfsd_proc_create: file handle not verified\n");
295                         goto out_unlock;
296                 }
297         }
298 
299         inode = d_inode(newfhp->fh_dentry);
300 
301         /* Unfudge the mode bits */
302         if (attr->ia_valid & ATTR_MODE) {
303                 type = attr->ia_mode & S_IFMT;
304                 mode = attr->ia_mode & ~S_IFMT;
305                 if (!type) {
306                         /* no type, so if target exists, assume same as that,
307                          * else assume a file */
308                         if (inode) {
309                                 type = inode->i_mode & S_IFMT;
310                                 switch(type) {
311                                 case S_IFCHR:
312                                 case S_IFBLK:
313                                         /* reserve rdev for later checking */
314                                         rdev = inode->i_rdev;
315                                         attr->ia_valid |= ATTR_SIZE;
316 
317                                         /* FALLTHROUGH */
318                                 case S_IFIFO:
319                                         /* this is probably a permission check..
320                                          * at least IRIX implements perm checking on
321                                          *   echo thing > device-special-file-or-pipe
322                                          * by doing a CREATE with type==0
323                                          */
324                                         nfserr = nfsd_permission(rqstp,
325                                                                  newfhp->fh_export,
326                                                                  newfhp->fh_dentry,
327                                                                  NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS);
328                                         if (nfserr && nfserr != nfserr_rofs)
329                                                 goto out_unlock;
330                                 }
331                         } else
332                                 type = S_IFREG;
333                 }
334         } else if (inode) {
335                 type = inode->i_mode & S_IFMT;
336                 mode = inode->i_mode & ~S_IFMT;
337         } else {
338                 type = S_IFREG;
339                 mode = 0;       /* ??? */
340         }
341 
342         attr->ia_valid |= ATTR_MODE;
343         attr->ia_mode = mode;
344 
345         /* Special treatment for non-regular files according to the
346          * gospel of sun micro
347          */
348         if (type != S_IFREG) {
349                 if (type != S_IFBLK && type != S_IFCHR) {
350                         rdev = 0;
351                 } else if (type == S_IFCHR && !(attr->ia_valid & ATTR_SIZE)) {
352                         /* If you think you've seen the worst, grok this. */
353                         type = S_IFIFO;
354                 } else {
355                         /* Okay, char or block special */
356                         if (!rdev)
357                                 rdev = wanted;
358                 }
359 
360                 /* we've used the SIZE information, so discard it */
361                 attr->ia_valid &= ~ATTR_SIZE;
362 
363                 /* Make sure the type and device matches */
364                 nfserr = nfserr_exist;
365                 if (inode && type != (inode->i_mode & S_IFMT))
366                         goto out_unlock;
367         }
368 
369         nfserr = 0;
370         if (!inode) {
371                 /* File doesn't exist. Create it and set attrs */
372                 nfserr = nfsd_create_locked(rqstp, dirfhp, argp->name,
373                                         argp->len, attr, type, rdev, newfhp);
374         } else if (type == S_IFREG) {
375                 dprintk("nfsd:   existing %s, valid=%x, size=%ld\n",
376                         argp->name, attr->ia_valid, (long) attr->ia_size);
377                 /* File already exists. We ignore all attributes except
378                  * size, so that creat() behaves exactly like
379                  * open(..., O_CREAT|O_TRUNC|O_WRONLY).
380                  */
381                 attr->ia_valid &= ATTR_SIZE;
382                 if (attr->ia_valid)
383                         nfserr = nfsd_setattr(rqstp, newfhp, attr, 0, (time64_t)0);
384         }
385 
386 out_unlock:
387         /* We don't really need to unlock, as fh_put does it. */
388         fh_unlock(dirfhp);
389         fh_drop_write(dirfhp);
390 done:
391         fh_put(dirfhp);
392         return nfsd_return_dirop(nfserr, resp);
393 }
394 
395 static __be32
396 nfsd_proc_remove(struct svc_rqst *rqstp)
397 {
398         struct nfsd_diropargs *argp = rqstp->rq_argp;
399         __be32  nfserr;
400 
401         dprintk("nfsd: REMOVE   %s %.*s\n", SVCFH_fmt(&argp->fh),
402                 argp->len, argp->name);
403 
404         /* Unlink. -SIFDIR means file must not be a directory */
405         nfserr = nfsd_unlink(rqstp, &argp->fh, -S_IFDIR, argp->name, argp->len);
406         fh_put(&argp->fh);
407         return nfserr;
408 }
409 
410 static __be32
411 nfsd_proc_rename(struct svc_rqst *rqstp)
412 {
413         struct nfsd_renameargs *argp = rqstp->rq_argp;
414         __be32  nfserr;
415 
416         dprintk("nfsd: RENAME   %s %.*s -> \n",
417                 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname);
418         dprintk("nfsd:        ->  %s %.*s\n",
419                 SVCFH_fmt(&argp->tfh), argp->tlen, argp->tname);
420 
421         nfserr = nfsd_rename(rqstp, &argp->ffh, argp->fname, argp->flen,
422                                     &argp->tfh, argp->tname, argp->tlen);
423         fh_put(&argp->ffh);
424         fh_put(&argp->tfh);
425         return nfserr;
426 }
427 
428 static __be32
429 nfsd_proc_link(struct svc_rqst *rqstp)
430 {
431         struct nfsd_linkargs *argp = rqstp->rq_argp;
432         __be32  nfserr;
433 
434         dprintk("nfsd: LINK     %s ->\n",
435                 SVCFH_fmt(&argp->ffh));
436         dprintk("nfsd:    %s %.*s\n",
437                 SVCFH_fmt(&argp->tfh),
438                 argp->tlen,
439                 argp->tname);
440 
441         nfserr = nfsd_link(rqstp, &argp->tfh, argp->tname, argp->tlen,
442                                   &argp->ffh);
443         fh_put(&argp->ffh);
444         fh_put(&argp->tfh);
445         return nfserr;
446 }
447 
448 static __be32
449 nfsd_proc_symlink(struct svc_rqst *rqstp)
450 {
451         struct nfsd_symlinkargs *argp = rqstp->rq_argp;
452         struct svc_fh   newfh;
453         __be32          nfserr;
454 
455         if (argp->tlen > NFS_MAXPATHLEN)
456                 return nfserr_nametoolong;
457 
458         argp->tname = svc_fill_symlink_pathname(rqstp, &argp->first,
459                                                 page_address(rqstp->rq_arg.pages[0]),
460                                                 argp->tlen);
461         if (IS_ERR(argp->tname))
462                 return nfserrno(PTR_ERR(argp->tname));
463 
464         dprintk("nfsd: SYMLINK  %s %.*s -> %.*s\n",
465                 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname,
466                 argp->tlen, argp->tname);
467 
468         fh_init(&newfh, NFS_FHSIZE);
469         nfserr = nfsd_symlink(rqstp, &argp->ffh, argp->fname, argp->flen,
470                                                  argp->tname, &newfh);
471 
472         kfree(argp->tname);
473         fh_put(&argp->ffh);
474         fh_put(&newfh);
475         return nfserr;
476 }
477 
478 /*
479  * Make directory. This operation is not idempotent.
480  * N.B. After this call resp->fh needs an fh_put
481  */
482 static __be32
483 nfsd_proc_mkdir(struct svc_rqst *rqstp)
484 {
485         struct nfsd_createargs *argp = rqstp->rq_argp;
486         struct nfsd_diropres *resp = rqstp->rq_resp;
487         __be32  nfserr;
488 
489         dprintk("nfsd: MKDIR    %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
490 
491         if (resp->fh.fh_dentry) {
492                 printk(KERN_WARNING
493                         "nfsd_proc_mkdir: response already verified??\n");
494         }
495 
496         argp->attrs.ia_valid &= ~ATTR_SIZE;
497         fh_init(&resp->fh, NFS_FHSIZE);
498         nfserr = nfsd_create(rqstp, &argp->fh, argp->name, argp->len,
499                                     &argp->attrs, S_IFDIR, 0, &resp->fh);
500         fh_put(&argp->fh);
501         return nfsd_return_dirop(nfserr, resp);
502 }
503 
504 /*
505  * Remove a directory
506  */
507 static __be32
508 nfsd_proc_rmdir(struct svc_rqst *rqstp)
509 {
510         struct nfsd_diropargs *argp = rqstp->rq_argp;
511         __be32  nfserr;
512 
513         dprintk("nfsd: RMDIR    %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
514 
515         nfserr = nfsd_unlink(rqstp, &argp->fh, S_IFDIR, argp->name, argp->len);
516         fh_put(&argp->fh);
517         return nfserr;
518 }
519 
520 /*
521  * Read a portion of a directory.
522  */
523 static __be32
524 nfsd_proc_readdir(struct svc_rqst *rqstp)
525 {
526         struct nfsd_readdirargs *argp = rqstp->rq_argp;
527         struct nfsd_readdirres *resp = rqstp->rq_resp;
528         int             count;
529         __be32          nfserr;
530         loff_t          offset;
531 
532         dprintk("nfsd: READDIR  %s %d bytes at %d\n",
533                 SVCFH_fmt(&argp->fh),           
534                 argp->count, argp->cookie);
535 
536         /* Shrink to the client read size */
537         count = (argp->count >> 2) - 2;
538 
539         /* Make sure we've room for the NULL ptr & eof flag */
540         count -= 2;
541         if (count < 0)
542                 count = 0;
543 
544         resp->buffer = argp->buffer;
545         resp->offset = NULL;
546         resp->buflen = count;
547         resp->common.err = nfs_ok;
548         /* Read directory and encode entries on the fly */
549         offset = argp->cookie;
550         nfserr = nfsd_readdir(rqstp, &argp->fh, &offset, 
551                               &resp->common, nfssvc_encode_entry);
552 
553         resp->count = resp->buffer - argp->buffer;
554         if (resp->offset)
555                 *resp->offset = htonl(offset);
556 
557         fh_put(&argp->fh);
558         return nfserr;
559 }
560 
561 /*
562  * Get file system info
563  */
564 static __be32
565 nfsd_proc_statfs(struct svc_rqst *rqstp)
566 {
567         struct nfsd_fhandle *argp = rqstp->rq_argp;
568         struct nfsd_statfsres *resp = rqstp->rq_resp;
569         __be32  nfserr;
570 
571         dprintk("nfsd: STATFS   %s\n", SVCFH_fmt(&argp->fh));
572 
573         nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats,
574                         NFSD_MAY_BYPASS_GSS_ON_ROOT);
575         fh_put(&argp->fh);
576         return nfserr;
577 }
578 
579 /*
580  * NFSv2 Server procedures.
581  * Only the results of non-idempotent operations are cached.
582  */
583 struct nfsd_void { int dummy; };
584 
585 #define ST 1            /* status */
586 #define FH 8            /* filehandle */
587 #define AT 18           /* attributes */
588 
589 static const struct svc_procedure nfsd_procedures2[18] = {
590         [NFSPROC_NULL] = {
591                 .pc_func = nfsd_proc_null,
592                 .pc_decode = nfssvc_decode_void,
593                 .pc_encode = nfssvc_encode_void,
594                 .pc_argsize = sizeof(struct nfsd_void),
595                 .pc_ressize = sizeof(struct nfsd_void),
596                 .pc_cachetype = RC_NOCACHE,
597                 .pc_xdrressize = ST,
598         },
599         [NFSPROC_GETATTR] = {
600                 .pc_func = nfsd_proc_getattr,
601                 .pc_decode = nfssvc_decode_fhandle,
602                 .pc_encode = nfssvc_encode_attrstat,
603                 .pc_release = nfssvc_release_fhandle,
604                 .pc_argsize = sizeof(struct nfsd_fhandle),
605                 .pc_ressize = sizeof(struct nfsd_attrstat),
606                 .pc_cachetype = RC_NOCACHE,
607                 .pc_xdrressize = ST+AT,
608         },
609         [NFSPROC_SETATTR] = {
610                 .pc_func = nfsd_proc_setattr,
611                 .pc_decode = nfssvc_decode_sattrargs,
612                 .pc_encode = nfssvc_encode_attrstat,
613                 .pc_release = nfssvc_release_fhandle,
614                 .pc_argsize = sizeof(struct nfsd_sattrargs),
615                 .pc_ressize = sizeof(struct nfsd_attrstat),
616                 .pc_cachetype = RC_REPLBUFF,
617                 .pc_xdrressize = ST+AT,
618         },
619         [NFSPROC_ROOT] = {
620                 .pc_decode = nfssvc_decode_void,
621                 .pc_encode = nfssvc_encode_void,
622                 .pc_argsize = sizeof(struct nfsd_void),
623                 .pc_ressize = sizeof(struct nfsd_void),
624                 .pc_cachetype = RC_NOCACHE,
625                 .pc_xdrressize = ST,
626         },
627         [NFSPROC_LOOKUP] = {
628                 .pc_func = nfsd_proc_lookup,
629                 .pc_decode = nfssvc_decode_diropargs,
630                 .pc_encode = nfssvc_encode_diropres,
631                 .pc_release = nfssvc_release_fhandle,
632                 .pc_argsize = sizeof(struct nfsd_diropargs),
633                 .pc_ressize = sizeof(struct nfsd_diropres),
634                 .pc_cachetype = RC_NOCACHE,
635                 .pc_xdrressize = ST+FH+AT,
636         },
637         [NFSPROC_READLINK] = {
638                 .pc_func = nfsd_proc_readlink,
639                 .pc_decode = nfssvc_decode_readlinkargs,
640                 .pc_encode = nfssvc_encode_readlinkres,
641                 .pc_argsize = sizeof(struct nfsd_readlinkargs),
642                 .pc_ressize = sizeof(struct nfsd_readlinkres),
643                 .pc_cachetype = RC_NOCACHE,
644                 .pc_xdrressize = ST+1+NFS_MAXPATHLEN/4,
645         },
646         [NFSPROC_READ] = {
647                 .pc_func = nfsd_proc_read,
648                 .pc_decode = nfssvc_decode_readargs,
649                 .pc_encode = nfssvc_encode_readres,
650                 .pc_release = nfssvc_release_fhandle,
651                 .pc_argsize = sizeof(struct nfsd_readargs),
652                 .pc_ressize = sizeof(struct nfsd_readres),
653                 .pc_cachetype = RC_NOCACHE,
654                 .pc_xdrressize = ST+AT+1+NFSSVC_MAXBLKSIZE_V2/4,
655         },
656         [NFSPROC_WRITECACHE] = {
657                 .pc_decode = nfssvc_decode_void,
658                 .pc_encode = nfssvc_encode_void,
659                 .pc_argsize = sizeof(struct nfsd_void),
660                 .pc_ressize = sizeof(struct nfsd_void),
661                 .pc_cachetype = RC_NOCACHE,
662                 .pc_xdrressize = ST,
663         },
664         [NFSPROC_WRITE] = {
665                 .pc_func = nfsd_proc_write,
666                 .pc_decode = nfssvc_decode_writeargs,
667                 .pc_encode = nfssvc_encode_attrstat,
668                 .pc_release = nfssvc_release_fhandle,
669                 .pc_argsize = sizeof(struct nfsd_writeargs),
670                 .pc_ressize = sizeof(struct nfsd_attrstat),
671                 .pc_cachetype = RC_REPLBUFF,
672                 .pc_xdrressize = ST+AT,
673         },
674         [NFSPROC_CREATE] = {
675                 .pc_func = nfsd_proc_create,
676                 .pc_decode = nfssvc_decode_createargs,
677                 .pc_encode = nfssvc_encode_diropres,
678                 .pc_release = nfssvc_release_fhandle,
679                 .pc_argsize = sizeof(struct nfsd_createargs),
680                 .pc_ressize = sizeof(struct nfsd_diropres),
681                 .pc_cachetype = RC_REPLBUFF,
682                 .pc_xdrressize = ST+FH+AT,
683         },
684         [NFSPROC_REMOVE] = {
685                 .pc_func = nfsd_proc_remove,
686                 .pc_decode = nfssvc_decode_diropargs,
687                 .pc_encode = nfssvc_encode_void,
688                 .pc_argsize = sizeof(struct nfsd_diropargs),
689                 .pc_ressize = sizeof(struct nfsd_void),
690                 .pc_cachetype = RC_REPLSTAT,
691                 .pc_xdrressize = ST,
692         },
693         [NFSPROC_RENAME] = {
694                 .pc_func = nfsd_proc_rename,
695                 .pc_decode = nfssvc_decode_renameargs,
696                 .pc_encode = nfssvc_encode_void,
697                 .pc_argsize = sizeof(struct nfsd_renameargs),
698                 .pc_ressize = sizeof(struct nfsd_void),
699                 .pc_cachetype = RC_REPLSTAT,
700                 .pc_xdrressize = ST,
701         },
702         [NFSPROC_LINK] = {
703                 .pc_func = nfsd_proc_link,
704                 .pc_decode = nfssvc_decode_linkargs,
705                 .pc_encode = nfssvc_encode_void,
706                 .pc_argsize = sizeof(struct nfsd_linkargs),
707                 .pc_ressize = sizeof(struct nfsd_void),
708                 .pc_cachetype = RC_REPLSTAT,
709                 .pc_xdrressize = ST,
710         },
711         [NFSPROC_SYMLINK] = {
712                 .pc_func = nfsd_proc_symlink,
713                 .pc_decode = nfssvc_decode_symlinkargs,
714                 .pc_encode = nfssvc_encode_void,
715                 .pc_argsize = sizeof(struct nfsd_symlinkargs),
716                 .pc_ressize = sizeof(struct nfsd_void),
717                 .pc_cachetype = RC_REPLSTAT,
718                 .pc_xdrressize = ST,
719         },
720         [NFSPROC_MKDIR] = {
721                 .pc_func = nfsd_proc_mkdir,
722                 .pc_decode = nfssvc_decode_createargs,
723                 .pc_encode = nfssvc_encode_diropres,
724                 .pc_release = nfssvc_release_fhandle,
725                 .pc_argsize = sizeof(struct nfsd_createargs),
726                 .pc_ressize = sizeof(struct nfsd_diropres),
727                 .pc_cachetype = RC_REPLBUFF,
728                 .pc_xdrressize = ST+FH+AT,
729         },
730         [NFSPROC_RMDIR] = {
731                 .pc_func = nfsd_proc_rmdir,
732                 .pc_decode = nfssvc_decode_diropargs,
733                 .pc_encode = nfssvc_encode_void,
734                 .pc_argsize = sizeof(struct nfsd_diropargs),
735                 .pc_ressize = sizeof(struct nfsd_void),
736                 .pc_cachetype = RC_REPLSTAT,
737                 .pc_xdrressize = ST,
738         },
739         [NFSPROC_READDIR] = {
740                 .pc_func = nfsd_proc_readdir,
741                 .pc_decode = nfssvc_decode_readdirargs,
742                 .pc_encode = nfssvc_encode_readdirres,
743                 .pc_argsize = sizeof(struct nfsd_readdirargs),
744                 .pc_ressize = sizeof(struct nfsd_readdirres),
745                 .pc_cachetype = RC_NOCACHE,
746         },
747         [NFSPROC_STATFS] = {
748                 .pc_func = nfsd_proc_statfs,
749                 .pc_decode = nfssvc_decode_fhandle,
750                 .pc_encode = nfssvc_encode_statfsres,
751                 .pc_argsize = sizeof(struct nfsd_fhandle),
752                 .pc_ressize = sizeof(struct nfsd_statfsres),
753                 .pc_cachetype = RC_NOCACHE,
754                 .pc_xdrressize = ST+5,
755         },
756 };
757 
758 
759 static unsigned int nfsd_count2[ARRAY_SIZE(nfsd_procedures2)];
760 const struct svc_version nfsd_version2 = {
761         .vs_vers        = 2,
762         .vs_nproc       = 18,
763         .vs_proc        = nfsd_procedures2,
764         .vs_count       = nfsd_count2,
765         .vs_dispatch    = nfsd_dispatch,
766         .vs_xdrsize     = NFS2_SVC_XDRSIZE,
767 };
768 
769 /*
770  * Map errnos to NFS errnos.
771  */
772 __be32
773 nfserrno (int errno)
774 {
775         static struct {
776                 __be32  nfserr;
777                 int     syserr;
778         } nfs_errtbl[] = {
779                 { nfs_ok, 0 },
780                 { nfserr_perm, -EPERM },
781                 { nfserr_noent, -ENOENT },
782                 { nfserr_io, -EIO },
783                 { nfserr_nxio, -ENXIO },
784                 { nfserr_fbig, -E2BIG },
785                 { nfserr_acces, -EACCES },
786                 { nfserr_exist, -EEXIST },
787                 { nfserr_xdev, -EXDEV },
788                 { nfserr_mlink, -EMLINK },
789                 { nfserr_nodev, -ENODEV },
790                 { nfserr_notdir, -ENOTDIR },
791                 { nfserr_isdir, -EISDIR },
792                 { nfserr_inval, -EINVAL },
793                 { nfserr_fbig, -EFBIG },
794                 { nfserr_nospc, -ENOSPC },
795                 { nfserr_rofs, -EROFS },
796                 { nfserr_mlink, -EMLINK },
797                 { nfserr_nametoolong, -ENAMETOOLONG },
798                 { nfserr_notempty, -ENOTEMPTY },
799 #ifdef EDQUOT
800                 { nfserr_dquot, -EDQUOT },
801 #endif
802                 { nfserr_stale, -ESTALE },
803                 { nfserr_jukebox, -ETIMEDOUT },
804                 { nfserr_jukebox, -ERESTARTSYS },
805                 { nfserr_jukebox, -EAGAIN },
806                 { nfserr_jukebox, -EWOULDBLOCK },
807                 { nfserr_jukebox, -ENOMEM },
808                 { nfserr_io, -ETXTBSY },
809                 { nfserr_notsupp, -EOPNOTSUPP },
810                 { nfserr_toosmall, -ETOOSMALL },
811                 { nfserr_serverfault, -ESERVERFAULT },
812                 { nfserr_serverfault, -ENFILE },
813                 { nfserr_io, -EUCLEAN },
814                 { nfserr_perm, -ENOKEY },
815         };
816         int     i;
817 
818         for (i = 0; i < ARRAY_SIZE(nfs_errtbl); i++) {
819                 if (nfs_errtbl[i].syserr == errno)
820                         return nfs_errtbl[i].nfserr;
821         }
822         WARN_ONCE(1, "nfsd: non-standard errno: %d\n", errno);
823         return nfserr_io;
824 }
825 
826 

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