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

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