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Linux/fs/nfsd/nfs3proc.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * Process version 3 NFS requests.
  4  *
  5  * Copyright (C) 1996, 1997, 1998 Olaf Kirch <okir@monad.swb.de>
  6  */
  7 
  8 #include <linux/fs.h>
  9 #include <linux/ext2_fs.h>
 10 #include <linux/magic.h>
 11 
 12 #include "cache.h"
 13 #include "xdr3.h"
 14 #include "vfs.h"
 15 
 16 #define NFSDDBG_FACILITY                NFSDDBG_PROC
 17 
 18 #define RETURN_STATUS(st)       { resp->status = (st); return (st); }
 19 
 20 static int      nfs3_ftypes[] = {
 21         0,                      /* NF3NON */
 22         S_IFREG,                /* NF3REG */
 23         S_IFDIR,                /* NF3DIR */
 24         S_IFBLK,                /* NF3BLK */
 25         S_IFCHR,                /* NF3CHR */
 26         S_IFLNK,                /* NF3LNK */
 27         S_IFSOCK,               /* NF3SOCK */
 28         S_IFIFO,                /* NF3FIFO */
 29 };
 30 
 31 /*
 32  * NULL call.
 33  */
 34 static __be32
 35 nfsd3_proc_null(struct svc_rqst *rqstp)
 36 {
 37         return nfs_ok;
 38 }
 39 
 40 /*
 41  * Get a file's attributes
 42  */
 43 static __be32
 44 nfsd3_proc_getattr(struct svc_rqst *rqstp)
 45 {
 46         struct nfsd_fhandle *argp = rqstp->rq_argp;
 47         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 48         __be32  nfserr;
 49 
 50         dprintk("nfsd: GETATTR(3)  %s\n",
 51                 SVCFH_fmt(&argp->fh));
 52 
 53         fh_copy(&resp->fh, &argp->fh);
 54         nfserr = fh_verify(rqstp, &resp->fh, 0,
 55                         NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
 56         if (nfserr)
 57                 RETURN_STATUS(nfserr);
 58 
 59         nfserr = fh_getattr(&resp->fh, &resp->stat);
 60 
 61         RETURN_STATUS(nfserr);
 62 }
 63 
 64 /*
 65  * Set a file's attributes
 66  */
 67 static __be32
 68 nfsd3_proc_setattr(struct svc_rqst *rqstp)
 69 {
 70         struct nfsd3_sattrargs *argp = rqstp->rq_argp;
 71         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 72         __be32  nfserr;
 73 
 74         dprintk("nfsd: SETATTR(3)  %s\n",
 75                                 SVCFH_fmt(&argp->fh));
 76 
 77         fh_copy(&resp->fh, &argp->fh);
 78         nfserr = nfsd_setattr(rqstp, &resp->fh, &argp->attrs,
 79                               argp->check_guard, argp->guardtime);
 80         RETURN_STATUS(nfserr);
 81 }
 82 
 83 /*
 84  * Look up a path name component
 85  */
 86 static __be32
 87 nfsd3_proc_lookup(struct svc_rqst *rqstp)
 88 {
 89         struct nfsd3_diropargs *argp = rqstp->rq_argp;
 90         struct nfsd3_diropres  *resp = rqstp->rq_resp;
 91         __be32  nfserr;
 92 
 93         dprintk("nfsd: LOOKUP(3)   %s %.*s\n",
 94                                 SVCFH_fmt(&argp->fh),
 95                                 argp->len,
 96                                 argp->name);
 97 
 98         fh_copy(&resp->dirfh, &argp->fh);
 99         fh_init(&resp->fh, NFS3_FHSIZE);
100 
101         nfserr = nfsd_lookup(rqstp, &resp->dirfh,
102                                     argp->name,
103                                     argp->len,
104                                     &resp->fh);
105         RETURN_STATUS(nfserr);
106 }
107 
108 /*
109  * Check file access
110  */
111 static __be32
112 nfsd3_proc_access(struct svc_rqst *rqstp)
113 {
114         struct nfsd3_accessargs *argp = rqstp->rq_argp;
115         struct nfsd3_accessres *resp = rqstp->rq_resp;
116         __be32  nfserr;
117 
118         dprintk("nfsd: ACCESS(3)   %s 0x%x\n",
119                                 SVCFH_fmt(&argp->fh),
120                                 argp->access);
121 
122         fh_copy(&resp->fh, &argp->fh);
123         resp->access = argp->access;
124         nfserr = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
125         RETURN_STATUS(nfserr);
126 }
127 
128 /*
129  * Read a symlink.
130  */
131 static __be32
132 nfsd3_proc_readlink(struct svc_rqst *rqstp)
133 {
134         struct nfsd3_readlinkargs *argp = rqstp->rq_argp;
135         struct nfsd3_readlinkres *resp = rqstp->rq_resp;
136         __be32 nfserr;
137 
138         dprintk("nfsd: READLINK(3) %s\n", SVCFH_fmt(&argp->fh));
139 
140         /* Read the symlink. */
141         fh_copy(&resp->fh, &argp->fh);
142         resp->len = NFS3_MAXPATHLEN;
143         nfserr = nfsd_readlink(rqstp, &resp->fh, argp->buffer, &resp->len);
144         RETURN_STATUS(nfserr);
145 }
146 
147 /*
148  * Read a portion of a file.
149  */
150 static __be32
151 nfsd3_proc_read(struct svc_rqst *rqstp)
152 {
153         struct nfsd3_readargs *argp = rqstp->rq_argp;
154         struct nfsd3_readres *resp = rqstp->rq_resp;
155         __be32  nfserr;
156         u32     max_blocksize = svc_max_payload(rqstp);
157         unsigned long cnt = min(argp->count, max_blocksize);
158 
159         dprintk("nfsd: READ(3) %s %lu bytes at %Lu\n",
160                                 SVCFH_fmt(&argp->fh),
161                                 (unsigned long) argp->count,
162                                 (unsigned long long) argp->offset);
163 
164         /* Obtain buffer pointer for payload.
165          * 1 (status) + 22 (post_op_attr) + 1 (count) + 1 (eof)
166          * + 1 (xdr opaque byte count) = 26
167          */
168         resp->count = cnt;
169         svc_reserve_auth(rqstp, ((1 + NFS3_POST_OP_ATTR_WORDS + 3)<<2) + resp->count +4);
170 
171         fh_copy(&resp->fh, &argp->fh);
172         nfserr = nfsd_read(rqstp, &resp->fh,
173                                   argp->offset,
174                                   rqstp->rq_vec, argp->vlen,
175                                   &resp->count);
176         if (nfserr == 0) {
177                 struct inode    *inode = d_inode(resp->fh.fh_dentry);
178                 resp->eof = nfsd_eof_on_read(cnt, resp->count, argp->offset,
179                                                         inode->i_size);
180         }
181 
182         RETURN_STATUS(nfserr);
183 }
184 
185 /*
186  * Write data to a file
187  */
188 static __be32
189 nfsd3_proc_write(struct svc_rqst *rqstp)
190 {
191         struct nfsd3_writeargs *argp = rqstp->rq_argp;
192         struct nfsd3_writeres *resp = rqstp->rq_resp;
193         __be32  nfserr;
194         unsigned long cnt = argp->len;
195         unsigned int nvecs;
196 
197         dprintk("nfsd: WRITE(3)    %s %d bytes at %Lu%s\n",
198                                 SVCFH_fmt(&argp->fh),
199                                 argp->len,
200                                 (unsigned long long) argp->offset,
201                                 argp->stable? " stable" : "");
202 
203         fh_copy(&resp->fh, &argp->fh);
204         resp->committed = argp->stable;
205         nvecs = svc_fill_write_vector(rqstp, rqstp->rq_arg.pages,
206                                       &argp->first, cnt);
207         if (!nvecs)
208                 RETURN_STATUS(nfserr_io);
209         nfserr = nfsd_write(rqstp, &resp->fh, argp->offset,
210                             rqstp->rq_vec, nvecs, &cnt,
211                             resp->committed);
212         resp->count = cnt;
213         RETURN_STATUS(nfserr);
214 }
215 
216 /*
217  * With NFSv3, CREATE processing is a lot easier than with NFSv2.
218  * At least in theory; we'll see how it fares in practice when the
219  * first reports about SunOS compatibility problems start to pour in...
220  */
221 static __be32
222 nfsd3_proc_create(struct svc_rqst *rqstp)
223 {
224         struct nfsd3_createargs *argp = rqstp->rq_argp;
225         struct nfsd3_diropres *resp = rqstp->rq_resp;
226         svc_fh          *dirfhp, *newfhp = NULL;
227         struct iattr    *attr;
228         __be32          nfserr;
229 
230         dprintk("nfsd: CREATE(3)   %s %.*s\n",
231                                 SVCFH_fmt(&argp->fh),
232                                 argp->len,
233                                 argp->name);
234 
235         dirfhp = fh_copy(&resp->dirfh, &argp->fh);
236         newfhp = fh_init(&resp->fh, NFS3_FHSIZE);
237         attr   = &argp->attrs;
238 
239         /* Unfudge the mode bits */
240         attr->ia_mode &= ~S_IFMT;
241         if (!(attr->ia_valid & ATTR_MODE)) { 
242                 attr->ia_valid |= ATTR_MODE;
243                 attr->ia_mode = S_IFREG;
244         } else {
245                 attr->ia_mode = (attr->ia_mode & ~S_IFMT) | S_IFREG;
246         }
247 
248         /* Now create the file and set attributes */
249         nfserr = do_nfsd_create(rqstp, dirfhp, argp->name, argp->len,
250                                 attr, newfhp,
251                                 argp->createmode, (u32 *)argp->verf, NULL, NULL);
252 
253         RETURN_STATUS(nfserr);
254 }
255 
256 /*
257  * Make directory. This operation is not idempotent.
258  */
259 static __be32
260 nfsd3_proc_mkdir(struct svc_rqst *rqstp)
261 {
262         struct nfsd3_createargs *argp = rqstp->rq_argp;
263         struct nfsd3_diropres *resp = rqstp->rq_resp;
264         __be32  nfserr;
265 
266         dprintk("nfsd: MKDIR(3)    %s %.*s\n",
267                                 SVCFH_fmt(&argp->fh),
268                                 argp->len,
269                                 argp->name);
270 
271         argp->attrs.ia_valid &= ~ATTR_SIZE;
272         fh_copy(&resp->dirfh, &argp->fh);
273         fh_init(&resp->fh, NFS3_FHSIZE);
274         nfserr = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
275                                     &argp->attrs, S_IFDIR, 0, &resp->fh);
276         fh_unlock(&resp->dirfh);
277         RETURN_STATUS(nfserr);
278 }
279 
280 static __be32
281 nfsd3_proc_symlink(struct svc_rqst *rqstp)
282 {
283         struct nfsd3_symlinkargs *argp = rqstp->rq_argp;
284         struct nfsd3_diropres *resp = rqstp->rq_resp;
285         __be32  nfserr;
286 
287         if (argp->tlen == 0)
288                 RETURN_STATUS(nfserr_inval);
289         if (argp->tlen > NFS3_MAXPATHLEN)
290                 RETURN_STATUS(nfserr_nametoolong);
291 
292         argp->tname = svc_fill_symlink_pathname(rqstp, &argp->first,
293                                                 page_address(rqstp->rq_arg.pages[0]),
294                                                 argp->tlen);
295         if (IS_ERR(argp->tname))
296                 RETURN_STATUS(nfserrno(PTR_ERR(argp->tname)));
297 
298         dprintk("nfsd: SYMLINK(3)  %s %.*s -> %.*s\n",
299                                 SVCFH_fmt(&argp->ffh),
300                                 argp->flen, argp->fname,
301                                 argp->tlen, argp->tname);
302 
303         fh_copy(&resp->dirfh, &argp->ffh);
304         fh_init(&resp->fh, NFS3_FHSIZE);
305         nfserr = nfsd_symlink(rqstp, &resp->dirfh, argp->fname, argp->flen,
306                                                    argp->tname, &resp->fh);
307         kfree(argp->tname);
308         RETURN_STATUS(nfserr);
309 }
310 
311 /*
312  * Make socket/fifo/device.
313  */
314 static __be32
315 nfsd3_proc_mknod(struct svc_rqst *rqstp)
316 {
317         struct nfsd3_mknodargs *argp = rqstp->rq_argp;
318         struct nfsd3_diropres  *resp = rqstp->rq_resp;
319         __be32  nfserr;
320         int type;
321         dev_t   rdev = 0;
322 
323         dprintk("nfsd: MKNOD(3)    %s %.*s\n",
324                                 SVCFH_fmt(&argp->fh),
325                                 argp->len,
326                                 argp->name);
327 
328         fh_copy(&resp->dirfh, &argp->fh);
329         fh_init(&resp->fh, NFS3_FHSIZE);
330 
331         if (argp->ftype == 0 || argp->ftype >= NF3BAD)
332                 RETURN_STATUS(nfserr_inval);
333         if (argp->ftype == NF3CHR || argp->ftype == NF3BLK) {
334                 rdev = MKDEV(argp->major, argp->minor);
335                 if (MAJOR(rdev) != argp->major ||
336                     MINOR(rdev) != argp->minor)
337                         RETURN_STATUS(nfserr_inval);
338         } else
339                 if (argp->ftype != NF3SOCK && argp->ftype != NF3FIFO)
340                         RETURN_STATUS(nfserr_inval);
341 
342         type = nfs3_ftypes[argp->ftype];
343         nfserr = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
344                                     &argp->attrs, type, rdev, &resp->fh);
345         fh_unlock(&resp->dirfh);
346         RETURN_STATUS(nfserr);
347 }
348 
349 /*
350  * Remove file/fifo/socket etc.
351  */
352 static __be32
353 nfsd3_proc_remove(struct svc_rqst *rqstp)
354 {
355         struct nfsd3_diropargs *argp = rqstp->rq_argp;
356         struct nfsd3_attrstat *resp = rqstp->rq_resp;
357         __be32  nfserr;
358 
359         dprintk("nfsd: REMOVE(3)   %s %.*s\n",
360                                 SVCFH_fmt(&argp->fh),
361                                 argp->len,
362                                 argp->name);
363 
364         /* Unlink. -S_IFDIR means file must not be a directory */
365         fh_copy(&resp->fh, &argp->fh);
366         nfserr = nfsd_unlink(rqstp, &resp->fh, -S_IFDIR, argp->name, argp->len);
367         fh_unlock(&resp->fh);
368         RETURN_STATUS(nfserr);
369 }
370 
371 /*
372  * Remove a directory
373  */
374 static __be32
375 nfsd3_proc_rmdir(struct svc_rqst *rqstp)
376 {
377         struct nfsd3_diropargs *argp = rqstp->rq_argp;
378         struct nfsd3_attrstat *resp = rqstp->rq_resp;
379         __be32  nfserr;
380 
381         dprintk("nfsd: RMDIR(3)    %s %.*s\n",
382                                 SVCFH_fmt(&argp->fh),
383                                 argp->len,
384                                 argp->name);
385 
386         fh_copy(&resp->fh, &argp->fh);
387         nfserr = nfsd_unlink(rqstp, &resp->fh, S_IFDIR, argp->name, argp->len);
388         fh_unlock(&resp->fh);
389         RETURN_STATUS(nfserr);
390 }
391 
392 static __be32
393 nfsd3_proc_rename(struct svc_rqst *rqstp)
394 {
395         struct nfsd3_renameargs *argp = rqstp->rq_argp;
396         struct nfsd3_renameres *resp = rqstp->rq_resp;
397         __be32  nfserr;
398 
399         dprintk("nfsd: RENAME(3)   %s %.*s ->\n",
400                                 SVCFH_fmt(&argp->ffh),
401                                 argp->flen,
402                                 argp->fname);
403         dprintk("nfsd: -> %s %.*s\n",
404                                 SVCFH_fmt(&argp->tfh),
405                                 argp->tlen,
406                                 argp->tname);
407 
408         fh_copy(&resp->ffh, &argp->ffh);
409         fh_copy(&resp->tfh, &argp->tfh);
410         nfserr = nfsd_rename(rqstp, &resp->ffh, argp->fname, argp->flen,
411                                     &resp->tfh, argp->tname, argp->tlen);
412         RETURN_STATUS(nfserr);
413 }
414 
415 static __be32
416 nfsd3_proc_link(struct svc_rqst *rqstp)
417 {
418         struct nfsd3_linkargs *argp = rqstp->rq_argp;
419         struct nfsd3_linkres  *resp = rqstp->rq_resp;
420         __be32  nfserr;
421 
422         dprintk("nfsd: LINK(3)     %s ->\n",
423                                 SVCFH_fmt(&argp->ffh));
424         dprintk("nfsd:   -> %s %.*s\n",
425                                 SVCFH_fmt(&argp->tfh),
426                                 argp->tlen,
427                                 argp->tname);
428 
429         fh_copy(&resp->fh,  &argp->ffh);
430         fh_copy(&resp->tfh, &argp->tfh);
431         nfserr = nfsd_link(rqstp, &resp->tfh, argp->tname, argp->tlen,
432                                   &resp->fh);
433         RETURN_STATUS(nfserr);
434 }
435 
436 /*
437  * Read a portion of a directory.
438  */
439 static __be32
440 nfsd3_proc_readdir(struct svc_rqst *rqstp)
441 {
442         struct nfsd3_readdirargs *argp = rqstp->rq_argp;
443         struct nfsd3_readdirres  *resp = rqstp->rq_resp;
444         __be32          nfserr;
445         int             count;
446 
447         dprintk("nfsd: READDIR(3)  %s %d bytes at %d\n",
448                                 SVCFH_fmt(&argp->fh),
449                                 argp->count, (u32) argp->cookie);
450 
451         /* Make sure we've room for the NULL ptr & eof flag, and shrink to
452          * client read size */
453         count = (argp->count >> 2) - 2;
454 
455         /* Read directory and encode entries on the fly */
456         fh_copy(&resp->fh, &argp->fh);
457 
458         resp->buflen = count;
459         resp->common.err = nfs_ok;
460         resp->buffer = argp->buffer;
461         resp->rqstp = rqstp;
462         nfserr = nfsd_readdir(rqstp, &resp->fh, (loff_t*) &argp->cookie, 
463                                         &resp->common, nfs3svc_encode_entry);
464         memcpy(resp->verf, argp->verf, 8);
465         resp->count = resp->buffer - argp->buffer;
466         if (resp->offset) {
467                 loff_t offset = argp->cookie;
468 
469                 if (unlikely(resp->offset1)) {
470                         /* we ended up with offset on a page boundary */
471                         *resp->offset = htonl(offset >> 32);
472                         *resp->offset1 = htonl(offset & 0xffffffff);
473                         resp->offset1 = NULL;
474                 } else {
475                         xdr_encode_hyper(resp->offset, offset);
476                 }
477                 resp->offset = NULL;
478         }
479 
480         RETURN_STATUS(nfserr);
481 }
482 
483 /*
484  * Read a portion of a directory, including file handles and attrs.
485  * For now, we choose to ignore the dircount parameter.
486  */
487 static __be32
488 nfsd3_proc_readdirplus(struct svc_rqst *rqstp)
489 {
490         struct nfsd3_readdirargs *argp = rqstp->rq_argp;
491         struct nfsd3_readdirres  *resp = rqstp->rq_resp;
492         __be32  nfserr;
493         int     count = 0;
494         loff_t  offset;
495         struct page **p;
496         caddr_t page_addr = NULL;
497 
498         dprintk("nfsd: READDIR+(3) %s %d bytes at %d\n",
499                                 SVCFH_fmt(&argp->fh),
500                                 argp->count, (u32) argp->cookie);
501 
502         /* Convert byte count to number of words (i.e. >> 2),
503          * and reserve room for the NULL ptr & eof flag (-2 words) */
504         resp->count = (argp->count >> 2) - 2;
505 
506         /* Read directory and encode entries on the fly */
507         fh_copy(&resp->fh, &argp->fh);
508 
509         resp->common.err = nfs_ok;
510         resp->buffer = argp->buffer;
511         resp->buflen = resp->count;
512         resp->rqstp = rqstp;
513         offset = argp->cookie;
514 
515         nfserr = fh_verify(rqstp, &resp->fh, S_IFDIR, NFSD_MAY_NOP);
516         if (nfserr)
517                 RETURN_STATUS(nfserr);
518 
519         if (resp->fh.fh_export->ex_flags & NFSEXP_NOREADDIRPLUS)
520                 RETURN_STATUS(nfserr_notsupp);
521 
522         nfserr = nfsd_readdir(rqstp, &resp->fh,
523                                      &offset,
524                                      &resp->common,
525                                      nfs3svc_encode_entry_plus);
526         memcpy(resp->verf, argp->verf, 8);
527         for (p = rqstp->rq_respages + 1; p < rqstp->rq_next_page; p++) {
528                 page_addr = page_address(*p);
529 
530                 if (((caddr_t)resp->buffer >= page_addr) &&
531                     ((caddr_t)resp->buffer < page_addr + PAGE_SIZE)) {
532                         count += (caddr_t)resp->buffer - page_addr;
533                         break;
534                 }
535                 count += PAGE_SIZE;
536         }
537         resp->count = count >> 2;
538         if (resp->offset) {
539                 if (unlikely(resp->offset1)) {
540                         /* we ended up with offset on a page boundary */
541                         *resp->offset = htonl(offset >> 32);
542                         *resp->offset1 = htonl(offset & 0xffffffff);
543                         resp->offset1 = NULL;
544                 } else {
545                         xdr_encode_hyper(resp->offset, offset);
546                 }
547                 resp->offset = NULL;
548         }
549 
550         RETURN_STATUS(nfserr);
551 }
552 
553 /*
554  * Get file system stats
555  */
556 static __be32
557 nfsd3_proc_fsstat(struct svc_rqst *rqstp)
558 {
559         struct nfsd_fhandle *argp = rqstp->rq_argp;
560         struct nfsd3_fsstatres *resp = rqstp->rq_resp;
561         __be32  nfserr;
562 
563         dprintk("nfsd: FSSTAT(3)   %s\n",
564                                 SVCFH_fmt(&argp->fh));
565 
566         nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats, 0);
567         fh_put(&argp->fh);
568         RETURN_STATUS(nfserr);
569 }
570 
571 /*
572  * Get file system info
573  */
574 static __be32
575 nfsd3_proc_fsinfo(struct svc_rqst *rqstp)
576 {
577         struct nfsd_fhandle *argp = rqstp->rq_argp;
578         struct nfsd3_fsinfores *resp = rqstp->rq_resp;
579         __be32  nfserr;
580         u32     max_blocksize = svc_max_payload(rqstp);
581 
582         dprintk("nfsd: FSINFO(3)   %s\n",
583                                 SVCFH_fmt(&argp->fh));
584 
585         resp->f_rtmax  = max_blocksize;
586         resp->f_rtpref = max_blocksize;
587         resp->f_rtmult = PAGE_SIZE;
588         resp->f_wtmax  = max_blocksize;
589         resp->f_wtpref = max_blocksize;
590         resp->f_wtmult = PAGE_SIZE;
591         resp->f_dtpref = PAGE_SIZE;
592         resp->f_maxfilesize = ~(u32) 0;
593         resp->f_properties = NFS3_FSF_DEFAULT;
594 
595         nfserr = fh_verify(rqstp, &argp->fh, 0,
596                         NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
597 
598         /* Check special features of the file system. May request
599          * different read/write sizes for file systems known to have
600          * problems with large blocks */
601         if (nfserr == 0) {
602                 struct super_block *sb = argp->fh.fh_dentry->d_sb;
603 
604                 /* Note that we don't care for remote fs's here */
605                 if (sb->s_magic == MSDOS_SUPER_MAGIC) {
606                         resp->f_properties = NFS3_FSF_BILLYBOY;
607                 }
608                 resp->f_maxfilesize = sb->s_maxbytes;
609         }
610 
611         fh_put(&argp->fh);
612         RETURN_STATUS(nfserr);
613 }
614 
615 /*
616  * Get pathconf info for the specified file
617  */
618 static __be32
619 nfsd3_proc_pathconf(struct svc_rqst *rqstp)
620 {
621         struct nfsd_fhandle *argp = rqstp->rq_argp;
622         struct nfsd3_pathconfres *resp = rqstp->rq_resp;
623         __be32  nfserr;
624 
625         dprintk("nfsd: PATHCONF(3) %s\n",
626                                 SVCFH_fmt(&argp->fh));
627 
628         /* Set default pathconf */
629         resp->p_link_max = 255;         /* at least */
630         resp->p_name_max = 255;         /* at least */
631         resp->p_no_trunc = 0;
632         resp->p_chown_restricted = 1;
633         resp->p_case_insensitive = 0;
634         resp->p_case_preserving = 1;
635 
636         nfserr = fh_verify(rqstp, &argp->fh, 0, NFSD_MAY_NOP);
637 
638         if (nfserr == 0) {
639                 struct super_block *sb = argp->fh.fh_dentry->d_sb;
640 
641                 /* Note that we don't care for remote fs's here */
642                 switch (sb->s_magic) {
643                 case EXT2_SUPER_MAGIC:
644                         resp->p_link_max = EXT2_LINK_MAX;
645                         resp->p_name_max = EXT2_NAME_LEN;
646                         break;
647                 case MSDOS_SUPER_MAGIC:
648                         resp->p_case_insensitive = 1;
649                         resp->p_case_preserving  = 0;
650                         break;
651                 }
652         }
653 
654         fh_put(&argp->fh);
655         RETURN_STATUS(nfserr);
656 }
657 
658 
659 /*
660  * Commit a file (range) to stable storage.
661  */
662 static __be32
663 nfsd3_proc_commit(struct svc_rqst *rqstp)
664 {
665         struct nfsd3_commitargs *argp = rqstp->rq_argp;
666         struct nfsd3_commitres *resp = rqstp->rq_resp;
667         __be32  nfserr;
668 
669         dprintk("nfsd: COMMIT(3)   %s %u@%Lu\n",
670                                 SVCFH_fmt(&argp->fh),
671                                 argp->count,
672                                 (unsigned long long) argp->offset);
673 
674         if (argp->offset > NFS_OFFSET_MAX)
675                 RETURN_STATUS(nfserr_inval);
676 
677         fh_copy(&resp->fh, &argp->fh);
678         nfserr = nfsd_commit(rqstp, &resp->fh, argp->offset, argp->count);
679 
680         RETURN_STATUS(nfserr);
681 }
682 
683 
684 /*
685  * NFSv3 Server procedures.
686  * Only the results of non-idempotent operations are cached.
687  */
688 #define nfs3svc_decode_fhandleargs      nfs3svc_decode_fhandle
689 #define nfs3svc_encode_attrstatres      nfs3svc_encode_attrstat
690 #define nfs3svc_encode_wccstatres       nfs3svc_encode_wccstat
691 #define nfsd3_mkdirargs                 nfsd3_createargs
692 #define nfsd3_readdirplusargs           nfsd3_readdirargs
693 #define nfsd3_fhandleargs               nfsd_fhandle
694 #define nfsd3_fhandleres                nfsd3_attrstat
695 #define nfsd3_attrstatres               nfsd3_attrstat
696 #define nfsd3_wccstatres                nfsd3_attrstat
697 #define nfsd3_createres                 nfsd3_diropres
698 #define nfsd3_voidres                   nfsd3_voidargs
699 struct nfsd3_voidargs { int dummy; };
700 
701 #define ST 1            /* status*/
702 #define FH 17           /* filehandle with length */
703 #define AT 21           /* attributes */
704 #define pAT (1+AT)      /* post attributes - conditional */
705 #define WC (7+pAT)      /* WCC attributes */
706 
707 static const struct svc_procedure nfsd_procedures3[22] = {
708         [NFS3PROC_NULL] = {
709                 .pc_func = nfsd3_proc_null,
710                 .pc_encode = nfs3svc_encode_voidres,
711                 .pc_argsize = sizeof(struct nfsd3_voidargs),
712                 .pc_ressize = sizeof(struct nfsd3_voidres),
713                 .pc_cachetype = RC_NOCACHE,
714                 .pc_xdrressize = ST,
715         },
716         [NFS3PROC_GETATTR] = {
717                 .pc_func = nfsd3_proc_getattr,
718                 .pc_decode = nfs3svc_decode_fhandleargs,
719                 .pc_encode = nfs3svc_encode_attrstatres,
720                 .pc_release = nfs3svc_release_fhandle,
721                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
722                 .pc_ressize = sizeof(struct nfsd3_attrstatres),
723                 .pc_cachetype = RC_NOCACHE,
724                 .pc_xdrressize = ST+AT,
725         },
726         [NFS3PROC_SETATTR] = {
727                 .pc_func = nfsd3_proc_setattr,
728                 .pc_decode = nfs3svc_decode_sattrargs,
729                 .pc_encode = nfs3svc_encode_wccstatres,
730                 .pc_release = nfs3svc_release_fhandle,
731                 .pc_argsize = sizeof(struct nfsd3_sattrargs),
732                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
733                 .pc_cachetype = RC_REPLBUFF,
734                 .pc_xdrressize = ST+WC,
735         },
736         [NFS3PROC_LOOKUP] = {
737                 .pc_func = nfsd3_proc_lookup,
738                 .pc_decode = nfs3svc_decode_diropargs,
739                 .pc_encode = nfs3svc_encode_diropres,
740                 .pc_release = nfs3svc_release_fhandle2,
741                 .pc_argsize = sizeof(struct nfsd3_diropargs),
742                 .pc_ressize = sizeof(struct nfsd3_diropres),
743                 .pc_cachetype = RC_NOCACHE,
744                 .pc_xdrressize = ST+FH+pAT+pAT,
745         },
746         [NFS3PROC_ACCESS] = {
747                 .pc_func = nfsd3_proc_access,
748                 .pc_decode = nfs3svc_decode_accessargs,
749                 .pc_encode = nfs3svc_encode_accessres,
750                 .pc_release = nfs3svc_release_fhandle,
751                 .pc_argsize = sizeof(struct nfsd3_accessargs),
752                 .pc_ressize = sizeof(struct nfsd3_accessres),
753                 .pc_cachetype = RC_NOCACHE,
754                 .pc_xdrressize = ST+pAT+1,
755         },
756         [NFS3PROC_READLINK] = {
757                 .pc_func = nfsd3_proc_readlink,
758                 .pc_decode = nfs3svc_decode_readlinkargs,
759                 .pc_encode = nfs3svc_encode_readlinkres,
760                 .pc_release = nfs3svc_release_fhandle,
761                 .pc_argsize = sizeof(struct nfsd3_readlinkargs),
762                 .pc_ressize = sizeof(struct nfsd3_readlinkres),
763                 .pc_cachetype = RC_NOCACHE,
764                 .pc_xdrressize = ST+pAT+1+NFS3_MAXPATHLEN/4,
765         },
766         [NFS3PROC_READ] = {
767                 .pc_func = nfsd3_proc_read,
768                 .pc_decode = nfs3svc_decode_readargs,
769                 .pc_encode = nfs3svc_encode_readres,
770                 .pc_release = nfs3svc_release_fhandle,
771                 .pc_argsize = sizeof(struct nfsd3_readargs),
772                 .pc_ressize = sizeof(struct nfsd3_readres),
773                 .pc_cachetype = RC_NOCACHE,
774                 .pc_xdrressize = ST+pAT+4+NFSSVC_MAXBLKSIZE/4,
775         },
776         [NFS3PROC_WRITE] = {
777                 .pc_func = nfsd3_proc_write,
778                 .pc_decode = nfs3svc_decode_writeargs,
779                 .pc_encode = nfs3svc_encode_writeres,
780                 .pc_release = nfs3svc_release_fhandle,
781                 .pc_argsize = sizeof(struct nfsd3_writeargs),
782                 .pc_ressize = sizeof(struct nfsd3_writeres),
783                 .pc_cachetype = RC_REPLBUFF,
784                 .pc_xdrressize = ST+WC+4,
785         },
786         [NFS3PROC_CREATE] = {
787                 .pc_func = nfsd3_proc_create,
788                 .pc_decode = nfs3svc_decode_createargs,
789                 .pc_encode = nfs3svc_encode_createres,
790                 .pc_release = nfs3svc_release_fhandle2,
791                 .pc_argsize = sizeof(struct nfsd3_createargs),
792                 .pc_ressize = sizeof(struct nfsd3_createres),
793                 .pc_cachetype = RC_REPLBUFF,
794                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
795         },
796         [NFS3PROC_MKDIR] = {
797                 .pc_func = nfsd3_proc_mkdir,
798                 .pc_decode = nfs3svc_decode_mkdirargs,
799                 .pc_encode = nfs3svc_encode_createres,
800                 .pc_release = nfs3svc_release_fhandle2,
801                 .pc_argsize = sizeof(struct nfsd3_mkdirargs),
802                 .pc_ressize = sizeof(struct nfsd3_createres),
803                 .pc_cachetype = RC_REPLBUFF,
804                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
805         },
806         [NFS3PROC_SYMLINK] = {
807                 .pc_func = nfsd3_proc_symlink,
808                 .pc_decode = nfs3svc_decode_symlinkargs,
809                 .pc_encode = nfs3svc_encode_createres,
810                 .pc_release = nfs3svc_release_fhandle2,
811                 .pc_argsize = sizeof(struct nfsd3_symlinkargs),
812                 .pc_ressize = sizeof(struct nfsd3_createres),
813                 .pc_cachetype = RC_REPLBUFF,
814                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
815         },
816         [NFS3PROC_MKNOD] = {
817                 .pc_func = nfsd3_proc_mknod,
818                 .pc_decode = nfs3svc_decode_mknodargs,
819                 .pc_encode = nfs3svc_encode_createres,
820                 .pc_release = nfs3svc_release_fhandle2,
821                 .pc_argsize = sizeof(struct nfsd3_mknodargs),
822                 .pc_ressize = sizeof(struct nfsd3_createres),
823                 .pc_cachetype = RC_REPLBUFF,
824                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
825         },
826         [NFS3PROC_REMOVE] = {
827                 .pc_func = nfsd3_proc_remove,
828                 .pc_decode = nfs3svc_decode_diropargs,
829                 .pc_encode = nfs3svc_encode_wccstatres,
830                 .pc_release = nfs3svc_release_fhandle,
831                 .pc_argsize = sizeof(struct nfsd3_diropargs),
832                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
833                 .pc_cachetype = RC_REPLBUFF,
834                 .pc_xdrressize = ST+WC,
835         },
836         [NFS3PROC_RMDIR] = {
837                 .pc_func = nfsd3_proc_rmdir,
838                 .pc_decode = nfs3svc_decode_diropargs,
839                 .pc_encode = nfs3svc_encode_wccstatres,
840                 .pc_release = nfs3svc_release_fhandle,
841                 .pc_argsize = sizeof(struct nfsd3_diropargs),
842                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
843                 .pc_cachetype = RC_REPLBUFF,
844                 .pc_xdrressize = ST+WC,
845         },
846         [NFS3PROC_RENAME] = {
847                 .pc_func = nfsd3_proc_rename,
848                 .pc_decode = nfs3svc_decode_renameargs,
849                 .pc_encode = nfs3svc_encode_renameres,
850                 .pc_release = nfs3svc_release_fhandle2,
851                 .pc_argsize = sizeof(struct nfsd3_renameargs),
852                 .pc_ressize = sizeof(struct nfsd3_renameres),
853                 .pc_cachetype = RC_REPLBUFF,
854                 .pc_xdrressize = ST+WC+WC,
855         },
856         [NFS3PROC_LINK] = {
857                 .pc_func = nfsd3_proc_link,
858                 .pc_decode = nfs3svc_decode_linkargs,
859                 .pc_encode = nfs3svc_encode_linkres,
860                 .pc_release = nfs3svc_release_fhandle2,
861                 .pc_argsize = sizeof(struct nfsd3_linkargs),
862                 .pc_ressize = sizeof(struct nfsd3_linkres),
863                 .pc_cachetype = RC_REPLBUFF,
864                 .pc_xdrressize = ST+pAT+WC,
865         },
866         [NFS3PROC_READDIR] = {
867                 .pc_func = nfsd3_proc_readdir,
868                 .pc_decode = nfs3svc_decode_readdirargs,
869                 .pc_encode = nfs3svc_encode_readdirres,
870                 .pc_release = nfs3svc_release_fhandle,
871                 .pc_argsize = sizeof(struct nfsd3_readdirargs),
872                 .pc_ressize = sizeof(struct nfsd3_readdirres),
873                 .pc_cachetype = RC_NOCACHE,
874         },
875         [NFS3PROC_READDIRPLUS] = {
876                 .pc_func = nfsd3_proc_readdirplus,
877                 .pc_decode = nfs3svc_decode_readdirplusargs,
878                 .pc_encode = nfs3svc_encode_readdirres,
879                 .pc_release = nfs3svc_release_fhandle,
880                 .pc_argsize = sizeof(struct nfsd3_readdirplusargs),
881                 .pc_ressize = sizeof(struct nfsd3_readdirres),
882                 .pc_cachetype = RC_NOCACHE,
883         },
884         [NFS3PROC_FSSTAT] = {
885                 .pc_func = nfsd3_proc_fsstat,
886                 .pc_decode = nfs3svc_decode_fhandleargs,
887                 .pc_encode = nfs3svc_encode_fsstatres,
888                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
889                 .pc_ressize = sizeof(struct nfsd3_fsstatres),
890                 .pc_cachetype = RC_NOCACHE,
891                 .pc_xdrressize = ST+pAT+2*6+1,
892         },
893         [NFS3PROC_FSINFO] = {
894                 .pc_func = nfsd3_proc_fsinfo,
895                 .pc_decode = nfs3svc_decode_fhandleargs,
896                 .pc_encode = nfs3svc_encode_fsinfores,
897                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
898                 .pc_ressize = sizeof(struct nfsd3_fsinfores),
899                 .pc_cachetype = RC_NOCACHE,
900                 .pc_xdrressize = ST+pAT+12,
901         },
902         [NFS3PROC_PATHCONF] = {
903                 .pc_func = nfsd3_proc_pathconf,
904                 .pc_decode = nfs3svc_decode_fhandleargs,
905                 .pc_encode = nfs3svc_encode_pathconfres,
906                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
907                 .pc_ressize = sizeof(struct nfsd3_pathconfres),
908                 .pc_cachetype = RC_NOCACHE,
909                 .pc_xdrressize = ST+pAT+6,
910         },
911         [NFS3PROC_COMMIT] = {
912                 .pc_func = nfsd3_proc_commit,
913                 .pc_decode = nfs3svc_decode_commitargs,
914                 .pc_encode = nfs3svc_encode_commitres,
915                 .pc_release = nfs3svc_release_fhandle,
916                 .pc_argsize = sizeof(struct nfsd3_commitargs),
917                 .pc_ressize = sizeof(struct nfsd3_commitres),
918                 .pc_cachetype = RC_NOCACHE,
919                 .pc_xdrressize = ST+WC+2,
920         },
921 };
922 
923 static unsigned int nfsd_count3[ARRAY_SIZE(nfsd_procedures3)];
924 const struct svc_version nfsd_version3 = {
925         .vs_vers        = 3,
926         .vs_nproc       = 22,
927         .vs_proc        = nfsd_procedures3,
928         .vs_dispatch    = nfsd_dispatch,
929         .vs_count       = nfsd_count3,
930         .vs_xdrsize     = NFS3_SVC_XDRSIZE,
931 };
932 

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