Merge remote-tracking branch 'regulator/fix/qcom-spmi' into regulator-linus
[sfrench/cifs-2.6.git] / fs / nfsd / nfs3proc.c
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
196         dprintk("nfsd: WRITE(3)    %s %d bytes at %Lu%s\n",
197                                 SVCFH_fmt(&argp->fh),
198                                 argp->len,
199                                 (unsigned long long) argp->offset,
200                                 argp->stable? " stable" : "");
201
202         fh_copy(&resp->fh, &argp->fh);
203         resp->committed = argp->stable;
204         nfserr = nfsd_write(rqstp, &resp->fh, argp->offset,
205                                 rqstp->rq_vec, argp->vlen,
206                                 &cnt, resp->committed);
207         resp->count = cnt;
208         RETURN_STATUS(nfserr);
209 }
210
211 /*
212  * With NFSv3, CREATE processing is a lot easier than with NFSv2.
213  * At least in theory; we'll see how it fares in practice when the
214  * first reports about SunOS compatibility problems start to pour in...
215  */
216 static __be32
217 nfsd3_proc_create(struct svc_rqst *rqstp)
218 {
219         struct nfsd3_createargs *argp = rqstp->rq_argp;
220         struct nfsd3_diropres *resp = rqstp->rq_resp;
221         svc_fh          *dirfhp, *newfhp = NULL;
222         struct iattr    *attr;
223         __be32          nfserr;
224
225         dprintk("nfsd: CREATE(3)   %s %.*s\n",
226                                 SVCFH_fmt(&argp->fh),
227                                 argp->len,
228                                 argp->name);
229
230         dirfhp = fh_copy(&resp->dirfh, &argp->fh);
231         newfhp = fh_init(&resp->fh, NFS3_FHSIZE);
232         attr   = &argp->attrs;
233
234         /* Unfudge the mode bits */
235         attr->ia_mode &= ~S_IFMT;
236         if (!(attr->ia_valid & ATTR_MODE)) { 
237                 attr->ia_valid |= ATTR_MODE;
238                 attr->ia_mode = S_IFREG;
239         } else {
240                 attr->ia_mode = (attr->ia_mode & ~S_IFMT) | S_IFREG;
241         }
242
243         /* Now create the file and set attributes */
244         nfserr = do_nfsd_create(rqstp, dirfhp, argp->name, argp->len,
245                                 attr, newfhp,
246                                 argp->createmode, (u32 *)argp->verf, NULL, NULL);
247
248         RETURN_STATUS(nfserr);
249 }
250
251 /*
252  * Make directory. This operation is not idempotent.
253  */
254 static __be32
255 nfsd3_proc_mkdir(struct svc_rqst *rqstp)
256 {
257         struct nfsd3_createargs *argp = rqstp->rq_argp;
258         struct nfsd3_diropres *resp = rqstp->rq_resp;
259         __be32  nfserr;
260
261         dprintk("nfsd: MKDIR(3)    %s %.*s\n",
262                                 SVCFH_fmt(&argp->fh),
263                                 argp->len,
264                                 argp->name);
265
266         argp->attrs.ia_valid &= ~ATTR_SIZE;
267         fh_copy(&resp->dirfh, &argp->fh);
268         fh_init(&resp->fh, NFS3_FHSIZE);
269         nfserr = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
270                                     &argp->attrs, S_IFDIR, 0, &resp->fh);
271         fh_unlock(&resp->dirfh);
272         RETURN_STATUS(nfserr);
273 }
274
275 static __be32
276 nfsd3_proc_symlink(struct svc_rqst *rqstp)
277 {
278         struct nfsd3_symlinkargs *argp = rqstp->rq_argp;
279         struct nfsd3_diropres *resp = rqstp->rq_resp;
280         __be32  nfserr;
281
282         dprintk("nfsd: SYMLINK(3)  %s %.*s -> %.*s\n",
283                                 SVCFH_fmt(&argp->ffh),
284                                 argp->flen, argp->fname,
285                                 argp->tlen, argp->tname);
286
287         fh_copy(&resp->dirfh, &argp->ffh);
288         fh_init(&resp->fh, NFS3_FHSIZE);
289         nfserr = nfsd_symlink(rqstp, &resp->dirfh, argp->fname, argp->flen,
290                                                    argp->tname, &resp->fh);
291         RETURN_STATUS(nfserr);
292 }
293
294 /*
295  * Make socket/fifo/device.
296  */
297 static __be32
298 nfsd3_proc_mknod(struct svc_rqst *rqstp)
299 {
300         struct nfsd3_mknodargs *argp = rqstp->rq_argp;
301         struct nfsd3_diropres  *resp = rqstp->rq_resp;
302         __be32  nfserr;
303         int type;
304         dev_t   rdev = 0;
305
306         dprintk("nfsd: MKNOD(3)    %s %.*s\n",
307                                 SVCFH_fmt(&argp->fh),
308                                 argp->len,
309                                 argp->name);
310
311         fh_copy(&resp->dirfh, &argp->fh);
312         fh_init(&resp->fh, NFS3_FHSIZE);
313
314         if (argp->ftype == 0 || argp->ftype >= NF3BAD)
315                 RETURN_STATUS(nfserr_inval);
316         if (argp->ftype == NF3CHR || argp->ftype == NF3BLK) {
317                 rdev = MKDEV(argp->major, argp->minor);
318                 if (MAJOR(rdev) != argp->major ||
319                     MINOR(rdev) != argp->minor)
320                         RETURN_STATUS(nfserr_inval);
321         } else
322                 if (argp->ftype != NF3SOCK && argp->ftype != NF3FIFO)
323                         RETURN_STATUS(nfserr_inval);
324
325         type = nfs3_ftypes[argp->ftype];
326         nfserr = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
327                                     &argp->attrs, type, rdev, &resp->fh);
328         fh_unlock(&resp->dirfh);
329         RETURN_STATUS(nfserr);
330 }
331
332 /*
333  * Remove file/fifo/socket etc.
334  */
335 static __be32
336 nfsd3_proc_remove(struct svc_rqst *rqstp)
337 {
338         struct nfsd3_diropargs *argp = rqstp->rq_argp;
339         struct nfsd3_attrstat *resp = rqstp->rq_resp;
340         __be32  nfserr;
341
342         dprintk("nfsd: REMOVE(3)   %s %.*s\n",
343                                 SVCFH_fmt(&argp->fh),
344                                 argp->len,
345                                 argp->name);
346
347         /* Unlink. -S_IFDIR means file must not be a directory */
348         fh_copy(&resp->fh, &argp->fh);
349         nfserr = nfsd_unlink(rqstp, &resp->fh, -S_IFDIR, argp->name, argp->len);
350         fh_unlock(&resp->fh);
351         RETURN_STATUS(nfserr);
352 }
353
354 /*
355  * Remove a directory
356  */
357 static __be32
358 nfsd3_proc_rmdir(struct svc_rqst *rqstp)
359 {
360         struct nfsd3_diropargs *argp = rqstp->rq_argp;
361         struct nfsd3_attrstat *resp = rqstp->rq_resp;
362         __be32  nfserr;
363
364         dprintk("nfsd: RMDIR(3)    %s %.*s\n",
365                                 SVCFH_fmt(&argp->fh),
366                                 argp->len,
367                                 argp->name);
368
369         fh_copy(&resp->fh, &argp->fh);
370         nfserr = nfsd_unlink(rqstp, &resp->fh, S_IFDIR, argp->name, argp->len);
371         fh_unlock(&resp->fh);
372         RETURN_STATUS(nfserr);
373 }
374
375 static __be32
376 nfsd3_proc_rename(struct svc_rqst *rqstp)
377 {
378         struct nfsd3_renameargs *argp = rqstp->rq_argp;
379         struct nfsd3_renameres *resp = rqstp->rq_resp;
380         __be32  nfserr;
381
382         dprintk("nfsd: RENAME(3)   %s %.*s ->\n",
383                                 SVCFH_fmt(&argp->ffh),
384                                 argp->flen,
385                                 argp->fname);
386         dprintk("nfsd: -> %s %.*s\n",
387                                 SVCFH_fmt(&argp->tfh),
388                                 argp->tlen,
389                                 argp->tname);
390
391         fh_copy(&resp->ffh, &argp->ffh);
392         fh_copy(&resp->tfh, &argp->tfh);
393         nfserr = nfsd_rename(rqstp, &resp->ffh, argp->fname, argp->flen,
394                                     &resp->tfh, argp->tname, argp->tlen);
395         RETURN_STATUS(nfserr);
396 }
397
398 static __be32
399 nfsd3_proc_link(struct svc_rqst *rqstp)
400 {
401         struct nfsd3_linkargs *argp = rqstp->rq_argp;
402         struct nfsd3_linkres  *resp = rqstp->rq_resp;
403         __be32  nfserr;
404
405         dprintk("nfsd: LINK(3)     %s ->\n",
406                                 SVCFH_fmt(&argp->ffh));
407         dprintk("nfsd:   -> %s %.*s\n",
408                                 SVCFH_fmt(&argp->tfh),
409                                 argp->tlen,
410                                 argp->tname);
411
412         fh_copy(&resp->fh,  &argp->ffh);
413         fh_copy(&resp->tfh, &argp->tfh);
414         nfserr = nfsd_link(rqstp, &resp->tfh, argp->tname, argp->tlen,
415                                   &resp->fh);
416         RETURN_STATUS(nfserr);
417 }
418
419 /*
420  * Read a portion of a directory.
421  */
422 static __be32
423 nfsd3_proc_readdir(struct svc_rqst *rqstp)
424 {
425         struct nfsd3_readdirargs *argp = rqstp->rq_argp;
426         struct nfsd3_readdirres  *resp = rqstp->rq_resp;
427         __be32          nfserr;
428         int             count;
429
430         dprintk("nfsd: READDIR(3)  %s %d bytes at %d\n",
431                                 SVCFH_fmt(&argp->fh),
432                                 argp->count, (u32) argp->cookie);
433
434         /* Make sure we've room for the NULL ptr & eof flag, and shrink to
435          * client read size */
436         count = (argp->count >> 2) - 2;
437
438         /* Read directory and encode entries on the fly */
439         fh_copy(&resp->fh, &argp->fh);
440
441         resp->buflen = count;
442         resp->common.err = nfs_ok;
443         resp->buffer = argp->buffer;
444         resp->rqstp = rqstp;
445         nfserr = nfsd_readdir(rqstp, &resp->fh, (loff_t*) &argp->cookie, 
446                                         &resp->common, nfs3svc_encode_entry);
447         memcpy(resp->verf, argp->verf, 8);
448         resp->count = resp->buffer - argp->buffer;
449         if (resp->offset)
450                 xdr_encode_hyper(resp->offset, argp->cookie);
451
452         RETURN_STATUS(nfserr);
453 }
454
455 /*
456  * Read a portion of a directory, including file handles and attrs.
457  * For now, we choose to ignore the dircount parameter.
458  */
459 static __be32
460 nfsd3_proc_readdirplus(struct svc_rqst *rqstp)
461 {
462         struct nfsd3_readdirargs *argp = rqstp->rq_argp;
463         struct nfsd3_readdirres  *resp = rqstp->rq_resp;
464         __be32  nfserr;
465         int     count = 0;
466         loff_t  offset;
467         struct page **p;
468         caddr_t page_addr = NULL;
469
470         dprintk("nfsd: READDIR+(3) %s %d bytes at %d\n",
471                                 SVCFH_fmt(&argp->fh),
472                                 argp->count, (u32) argp->cookie);
473
474         /* Convert byte count to number of words (i.e. >> 2),
475          * and reserve room for the NULL ptr & eof flag (-2 words) */
476         resp->count = (argp->count >> 2) - 2;
477
478         /* Read directory and encode entries on the fly */
479         fh_copy(&resp->fh, &argp->fh);
480
481         resp->common.err = nfs_ok;
482         resp->buffer = argp->buffer;
483         resp->buflen = resp->count;
484         resp->rqstp = rqstp;
485         offset = argp->cookie;
486
487         nfserr = fh_verify(rqstp, &resp->fh, S_IFDIR, NFSD_MAY_NOP);
488         if (nfserr)
489                 RETURN_STATUS(nfserr);
490
491         if (resp->fh.fh_export->ex_flags & NFSEXP_NOREADDIRPLUS)
492                 RETURN_STATUS(nfserr_notsupp);
493
494         nfserr = nfsd_readdir(rqstp, &resp->fh,
495                                      &offset,
496                                      &resp->common,
497                                      nfs3svc_encode_entry_plus);
498         memcpy(resp->verf, argp->verf, 8);
499         for (p = rqstp->rq_respages + 1; p < rqstp->rq_next_page; p++) {
500                 page_addr = page_address(*p);
501
502                 if (((caddr_t)resp->buffer >= page_addr) &&
503                     ((caddr_t)resp->buffer < page_addr + PAGE_SIZE)) {
504                         count += (caddr_t)resp->buffer - page_addr;
505                         break;
506                 }
507                 count += PAGE_SIZE;
508         }
509         resp->count = count >> 2;
510         if (resp->offset) {
511                 if (unlikely(resp->offset1)) {
512                         /* we ended up with offset on a page boundary */
513                         *resp->offset = htonl(offset >> 32);
514                         *resp->offset1 = htonl(offset & 0xffffffff);
515                         resp->offset1 = NULL;
516                 } else {
517                         xdr_encode_hyper(resp->offset, offset);
518                 }
519         }
520
521         RETURN_STATUS(nfserr);
522 }
523
524 /*
525  * Get file system stats
526  */
527 static __be32
528 nfsd3_proc_fsstat(struct svc_rqst *rqstp)
529 {
530         struct nfsd_fhandle *argp = rqstp->rq_argp;
531         struct nfsd3_fsstatres *resp = rqstp->rq_resp;
532         __be32  nfserr;
533
534         dprintk("nfsd: FSSTAT(3)   %s\n",
535                                 SVCFH_fmt(&argp->fh));
536
537         nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats, 0);
538         fh_put(&argp->fh);
539         RETURN_STATUS(nfserr);
540 }
541
542 /*
543  * Get file system info
544  */
545 static __be32
546 nfsd3_proc_fsinfo(struct svc_rqst *rqstp)
547 {
548         struct nfsd_fhandle *argp = rqstp->rq_argp;
549         struct nfsd3_fsinfores *resp = rqstp->rq_resp;
550         __be32  nfserr;
551         u32     max_blocksize = svc_max_payload(rqstp);
552
553         dprintk("nfsd: FSINFO(3)   %s\n",
554                                 SVCFH_fmt(&argp->fh));
555
556         resp->f_rtmax  = max_blocksize;
557         resp->f_rtpref = max_blocksize;
558         resp->f_rtmult = PAGE_SIZE;
559         resp->f_wtmax  = max_blocksize;
560         resp->f_wtpref = max_blocksize;
561         resp->f_wtmult = PAGE_SIZE;
562         resp->f_dtpref = PAGE_SIZE;
563         resp->f_maxfilesize = ~(u32) 0;
564         resp->f_properties = NFS3_FSF_DEFAULT;
565
566         nfserr = fh_verify(rqstp, &argp->fh, 0,
567                         NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
568
569         /* Check special features of the file system. May request
570          * different read/write sizes for file systems known to have
571          * problems with large blocks */
572         if (nfserr == 0) {
573                 struct super_block *sb = argp->fh.fh_dentry->d_sb;
574
575                 /* Note that we don't care for remote fs's here */
576                 if (sb->s_magic == MSDOS_SUPER_MAGIC) {
577                         resp->f_properties = NFS3_FSF_BILLYBOY;
578                 }
579                 resp->f_maxfilesize = sb->s_maxbytes;
580         }
581
582         fh_put(&argp->fh);
583         RETURN_STATUS(nfserr);
584 }
585
586 /*
587  * Get pathconf info for the specified file
588  */
589 static __be32
590 nfsd3_proc_pathconf(struct svc_rqst *rqstp)
591 {
592         struct nfsd_fhandle *argp = rqstp->rq_argp;
593         struct nfsd3_pathconfres *resp = rqstp->rq_resp;
594         __be32  nfserr;
595
596         dprintk("nfsd: PATHCONF(3) %s\n",
597                                 SVCFH_fmt(&argp->fh));
598
599         /* Set default pathconf */
600         resp->p_link_max = 255;         /* at least */
601         resp->p_name_max = 255;         /* at least */
602         resp->p_no_trunc = 0;
603         resp->p_chown_restricted = 1;
604         resp->p_case_insensitive = 0;
605         resp->p_case_preserving = 1;
606
607         nfserr = fh_verify(rqstp, &argp->fh, 0, NFSD_MAY_NOP);
608
609         if (nfserr == 0) {
610                 struct super_block *sb = argp->fh.fh_dentry->d_sb;
611
612                 /* Note that we don't care for remote fs's here */
613                 switch (sb->s_magic) {
614                 case EXT2_SUPER_MAGIC:
615                         resp->p_link_max = EXT2_LINK_MAX;
616                         resp->p_name_max = EXT2_NAME_LEN;
617                         break;
618                 case MSDOS_SUPER_MAGIC:
619                         resp->p_case_insensitive = 1;
620                         resp->p_case_preserving  = 0;
621                         break;
622                 }
623         }
624
625         fh_put(&argp->fh);
626         RETURN_STATUS(nfserr);
627 }
628
629
630 /*
631  * Commit a file (range) to stable storage.
632  */
633 static __be32
634 nfsd3_proc_commit(struct svc_rqst *rqstp)
635 {
636         struct nfsd3_commitargs *argp = rqstp->rq_argp;
637         struct nfsd3_commitres *resp = rqstp->rq_resp;
638         __be32  nfserr;
639
640         dprintk("nfsd: COMMIT(3)   %s %u@%Lu\n",
641                                 SVCFH_fmt(&argp->fh),
642                                 argp->count,
643                                 (unsigned long long) argp->offset);
644
645         if (argp->offset > NFS_OFFSET_MAX)
646                 RETURN_STATUS(nfserr_inval);
647
648         fh_copy(&resp->fh, &argp->fh);
649         nfserr = nfsd_commit(rqstp, &resp->fh, argp->offset, argp->count);
650
651         RETURN_STATUS(nfserr);
652 }
653
654
655 /*
656  * NFSv3 Server procedures.
657  * Only the results of non-idempotent operations are cached.
658  */
659 #define nfs3svc_decode_fhandleargs      nfs3svc_decode_fhandle
660 #define nfs3svc_encode_attrstatres      nfs3svc_encode_attrstat
661 #define nfs3svc_encode_wccstatres       nfs3svc_encode_wccstat
662 #define nfsd3_mkdirargs                 nfsd3_createargs
663 #define nfsd3_readdirplusargs           nfsd3_readdirargs
664 #define nfsd3_fhandleargs               nfsd_fhandle
665 #define nfsd3_fhandleres                nfsd3_attrstat
666 #define nfsd3_attrstatres               nfsd3_attrstat
667 #define nfsd3_wccstatres                nfsd3_attrstat
668 #define nfsd3_createres                 nfsd3_diropres
669 #define nfsd3_voidres                   nfsd3_voidargs
670 struct nfsd3_voidargs { int dummy; };
671
672 #define ST 1            /* status*/
673 #define FH 17           /* filehandle with length */
674 #define AT 21           /* attributes */
675 #define pAT (1+AT)      /* post attributes - conditional */
676 #define WC (7+pAT)      /* WCC attributes */
677
678 static const struct svc_procedure nfsd_procedures3[22] = {
679         [NFS3PROC_NULL] = {
680                 .pc_func = nfsd3_proc_null,
681                 .pc_encode = nfs3svc_encode_voidres,
682                 .pc_argsize = sizeof(struct nfsd3_voidargs),
683                 .pc_ressize = sizeof(struct nfsd3_voidres),
684                 .pc_cachetype = RC_NOCACHE,
685                 .pc_xdrressize = ST,
686         },
687         [NFS3PROC_GETATTR] = {
688                 .pc_func = nfsd3_proc_getattr,
689                 .pc_decode = nfs3svc_decode_fhandleargs,
690                 .pc_encode = nfs3svc_encode_attrstatres,
691                 .pc_release = nfs3svc_release_fhandle,
692                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
693                 .pc_ressize = sizeof(struct nfsd3_attrstatres),
694                 .pc_cachetype = RC_NOCACHE,
695                 .pc_xdrressize = ST+AT,
696         },
697         [NFS3PROC_SETATTR] = {
698                 .pc_func = nfsd3_proc_setattr,
699                 .pc_decode = nfs3svc_decode_sattrargs,
700                 .pc_encode = nfs3svc_encode_wccstatres,
701                 .pc_release = nfs3svc_release_fhandle,
702                 .pc_argsize = sizeof(struct nfsd3_sattrargs),
703                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
704                 .pc_cachetype = RC_REPLBUFF,
705                 .pc_xdrressize = ST+WC,
706         },
707         [NFS3PROC_LOOKUP] = {
708                 .pc_func = nfsd3_proc_lookup,
709                 .pc_decode = nfs3svc_decode_diropargs,
710                 .pc_encode = nfs3svc_encode_diropres,
711                 .pc_release = nfs3svc_release_fhandle2,
712                 .pc_argsize = sizeof(struct nfsd3_diropargs),
713                 .pc_ressize = sizeof(struct nfsd3_diropres),
714                 .pc_cachetype = RC_NOCACHE,
715                 .pc_xdrressize = ST+FH+pAT+pAT,
716         },
717         [NFS3PROC_ACCESS] = {
718                 .pc_func = nfsd3_proc_access,
719                 .pc_decode = nfs3svc_decode_accessargs,
720                 .pc_encode = nfs3svc_encode_accessres,
721                 .pc_release = nfs3svc_release_fhandle,
722                 .pc_argsize = sizeof(struct nfsd3_accessargs),
723                 .pc_ressize = sizeof(struct nfsd3_accessres),
724                 .pc_cachetype = RC_NOCACHE,
725                 .pc_xdrressize = ST+pAT+1,
726         },
727         [NFS3PROC_READLINK] = {
728                 .pc_func = nfsd3_proc_readlink,
729                 .pc_decode = nfs3svc_decode_readlinkargs,
730                 .pc_encode = nfs3svc_encode_readlinkres,
731                 .pc_release = nfs3svc_release_fhandle,
732                 .pc_argsize = sizeof(struct nfsd3_readlinkargs),
733                 .pc_ressize = sizeof(struct nfsd3_readlinkres),
734                 .pc_cachetype = RC_NOCACHE,
735                 .pc_xdrressize = ST+pAT+1+NFS3_MAXPATHLEN/4,
736         },
737         [NFS3PROC_READ] = {
738                 .pc_func = nfsd3_proc_read,
739                 .pc_decode = nfs3svc_decode_readargs,
740                 .pc_encode = nfs3svc_encode_readres,
741                 .pc_release = nfs3svc_release_fhandle,
742                 .pc_argsize = sizeof(struct nfsd3_readargs),
743                 .pc_ressize = sizeof(struct nfsd3_readres),
744                 .pc_cachetype = RC_NOCACHE,
745                 .pc_xdrressize = ST+pAT+4+NFSSVC_MAXBLKSIZE/4,
746         },
747         [NFS3PROC_WRITE] = {
748                 .pc_func = nfsd3_proc_write,
749                 .pc_decode = nfs3svc_decode_writeargs,
750                 .pc_encode = nfs3svc_encode_writeres,
751                 .pc_release = nfs3svc_release_fhandle,
752                 .pc_argsize = sizeof(struct nfsd3_writeargs),
753                 .pc_ressize = sizeof(struct nfsd3_writeres),
754                 .pc_cachetype = RC_REPLBUFF,
755                 .pc_xdrressize = ST+WC+4,
756         },
757         [NFS3PROC_CREATE] = {
758                 .pc_func = nfsd3_proc_create,
759                 .pc_decode = nfs3svc_decode_createargs,
760                 .pc_encode = nfs3svc_encode_createres,
761                 .pc_release = nfs3svc_release_fhandle2,
762                 .pc_argsize = sizeof(struct nfsd3_createargs),
763                 .pc_ressize = sizeof(struct nfsd3_createres),
764                 .pc_cachetype = RC_REPLBUFF,
765                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
766         },
767         [NFS3PROC_MKDIR] = {
768                 .pc_func = nfsd3_proc_mkdir,
769                 .pc_decode = nfs3svc_decode_mkdirargs,
770                 .pc_encode = nfs3svc_encode_createres,
771                 .pc_release = nfs3svc_release_fhandle2,
772                 .pc_argsize = sizeof(struct nfsd3_mkdirargs),
773                 .pc_ressize = sizeof(struct nfsd3_createres),
774                 .pc_cachetype = RC_REPLBUFF,
775                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
776         },
777         [NFS3PROC_SYMLINK] = {
778                 .pc_func = nfsd3_proc_symlink,
779                 .pc_decode = nfs3svc_decode_symlinkargs,
780                 .pc_encode = nfs3svc_encode_createres,
781                 .pc_release = nfs3svc_release_fhandle2,
782                 .pc_argsize = sizeof(struct nfsd3_symlinkargs),
783                 .pc_ressize = sizeof(struct nfsd3_createres),
784                 .pc_cachetype = RC_REPLBUFF,
785                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
786         },
787         [NFS3PROC_MKNOD] = {
788                 .pc_func = nfsd3_proc_mknod,
789                 .pc_decode = nfs3svc_decode_mknodargs,
790                 .pc_encode = nfs3svc_encode_createres,
791                 .pc_release = nfs3svc_release_fhandle2,
792                 .pc_argsize = sizeof(struct nfsd3_mknodargs),
793                 .pc_ressize = sizeof(struct nfsd3_createres),
794                 .pc_cachetype = RC_REPLBUFF,
795                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
796         },
797         [NFS3PROC_REMOVE] = {
798                 .pc_func = nfsd3_proc_remove,
799                 .pc_decode = nfs3svc_decode_diropargs,
800                 .pc_encode = nfs3svc_encode_wccstatres,
801                 .pc_release = nfs3svc_release_fhandle,
802                 .pc_argsize = sizeof(struct nfsd3_diropargs),
803                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
804                 .pc_cachetype = RC_REPLBUFF,
805                 .pc_xdrressize = ST+WC,
806         },
807         [NFS3PROC_RMDIR] = {
808                 .pc_func = nfsd3_proc_rmdir,
809                 .pc_decode = nfs3svc_decode_diropargs,
810                 .pc_encode = nfs3svc_encode_wccstatres,
811                 .pc_release = nfs3svc_release_fhandle,
812                 .pc_argsize = sizeof(struct nfsd3_diropargs),
813                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
814                 .pc_cachetype = RC_REPLBUFF,
815                 .pc_xdrressize = ST+WC,
816         },
817         [NFS3PROC_RENAME] = {
818                 .pc_func = nfsd3_proc_rename,
819                 .pc_decode = nfs3svc_decode_renameargs,
820                 .pc_encode = nfs3svc_encode_renameres,
821                 .pc_release = nfs3svc_release_fhandle2,
822                 .pc_argsize = sizeof(struct nfsd3_renameargs),
823                 .pc_ressize = sizeof(struct nfsd3_renameres),
824                 .pc_cachetype = RC_REPLBUFF,
825                 .pc_xdrressize = ST+WC+WC,
826         },
827         [NFS3PROC_LINK] = {
828                 .pc_func = nfsd3_proc_link,
829                 .pc_decode = nfs3svc_decode_linkargs,
830                 .pc_encode = nfs3svc_encode_linkres,
831                 .pc_release = nfs3svc_release_fhandle2,
832                 .pc_argsize = sizeof(struct nfsd3_linkargs),
833                 .pc_ressize = sizeof(struct nfsd3_linkres),
834                 .pc_cachetype = RC_REPLBUFF,
835                 .pc_xdrressize = ST+pAT+WC,
836         },
837         [NFS3PROC_READDIR] = {
838                 .pc_func = nfsd3_proc_readdir,
839                 .pc_decode = nfs3svc_decode_readdirargs,
840                 .pc_encode = nfs3svc_encode_readdirres,
841                 .pc_release = nfs3svc_release_fhandle,
842                 .pc_argsize = sizeof(struct nfsd3_readdirargs),
843                 .pc_ressize = sizeof(struct nfsd3_readdirres),
844                 .pc_cachetype = RC_NOCACHE,
845         },
846         [NFS3PROC_READDIRPLUS] = {
847                 .pc_func = nfsd3_proc_readdirplus,
848                 .pc_decode = nfs3svc_decode_readdirplusargs,
849                 .pc_encode = nfs3svc_encode_readdirres,
850                 .pc_release = nfs3svc_release_fhandle,
851                 .pc_argsize = sizeof(struct nfsd3_readdirplusargs),
852                 .pc_ressize = sizeof(struct nfsd3_readdirres),
853                 .pc_cachetype = RC_NOCACHE,
854         },
855         [NFS3PROC_FSSTAT] = {
856                 .pc_func = nfsd3_proc_fsstat,
857                 .pc_decode = nfs3svc_decode_fhandleargs,
858                 .pc_encode = nfs3svc_encode_fsstatres,
859                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
860                 .pc_ressize = sizeof(struct nfsd3_fsstatres),
861                 .pc_cachetype = RC_NOCACHE,
862                 .pc_xdrressize = ST+pAT+2*6+1,
863         },
864         [NFS3PROC_FSINFO] = {
865                 .pc_func = nfsd3_proc_fsinfo,
866                 .pc_decode = nfs3svc_decode_fhandleargs,
867                 .pc_encode = nfs3svc_encode_fsinfores,
868                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
869                 .pc_ressize = sizeof(struct nfsd3_fsinfores),
870                 .pc_cachetype = RC_NOCACHE,
871                 .pc_xdrressize = ST+pAT+12,
872         },
873         [NFS3PROC_PATHCONF] = {
874                 .pc_func = nfsd3_proc_pathconf,
875                 .pc_decode = nfs3svc_decode_fhandleargs,
876                 .pc_encode = nfs3svc_encode_pathconfres,
877                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
878                 .pc_ressize = sizeof(struct nfsd3_pathconfres),
879                 .pc_cachetype = RC_NOCACHE,
880                 .pc_xdrressize = ST+pAT+6,
881         },
882         [NFS3PROC_COMMIT] = {
883                 .pc_func = nfsd3_proc_commit,
884                 .pc_decode = nfs3svc_decode_commitargs,
885                 .pc_encode = nfs3svc_encode_commitres,
886                 .pc_release = nfs3svc_release_fhandle,
887                 .pc_argsize = sizeof(struct nfsd3_commitargs),
888                 .pc_ressize = sizeof(struct nfsd3_commitres),
889                 .pc_cachetype = RC_NOCACHE,
890                 .pc_xdrressize = ST+WC+2,
891         },
892 };
893
894 static unsigned int nfsd_count3[ARRAY_SIZE(nfsd_procedures3)];
895 const struct svc_version nfsd_version3 = {
896         .vs_vers        = 3,
897         .vs_nproc       = 22,
898         .vs_proc        = nfsd_procedures3,
899         .vs_dispatch    = nfsd_dispatch,
900         .vs_count       = nfsd_count3,
901         .vs_xdrsize     = NFS3_SVC_XDRSIZE,
902 };