xref: /openbmc/linux/fs/nfsd/nfs4proc.c (revision fd589a8f)
1 /*
2  *  fs/nfsd/nfs4proc.c
3  *
4  *  Server-side procedures for NFSv4.
5  *
6  *  Copyright (c) 2002 The Regents of the University of Michigan.
7  *  All rights reserved.
8  *
9  *  Kendrick Smith <kmsmith@umich.edu>
10  *  Andy Adamson   <andros@umich.edu>
11  *
12  *  Redistribution and use in source and binary forms, with or without
13  *  modification, are permitted provided that the following conditions
14  *  are met:
15  *
16  *  1. Redistributions of source code must retain the above copyright
17  *     notice, this list of conditions and the following disclaimer.
18  *  2. Redistributions in binary form must reproduce the above copyright
19  *     notice, this list of conditions and the following disclaimer in the
20  *     documentation and/or other materials provided with the distribution.
21  *  3. Neither the name of the University nor the names of its
22  *     contributors may be used to endorse or promote products derived
23  *     from this software without specific prior written permission.
24  *
25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36  */
37 
38 #include <linux/param.h>
39 #include <linux/major.h>
40 #include <linux/slab.h>
41 #include <linux/file.h>
42 
43 #include <linux/sunrpc/svc.h>
44 #include <linux/nfsd/nfsd.h>
45 #include <linux/nfsd/cache.h>
46 #include <linux/nfs4.h>
47 #include <linux/nfsd/state.h>
48 #include <linux/nfsd/xdr4.h>
49 #include <linux/nfs4_acl.h>
50 #include <linux/sunrpc/gss_api.h>
51 
52 #define NFSDDBG_FACILITY		NFSDDBG_PROC
53 
54 static u32 nfsd_attrmask[] = {
55 	NFSD_WRITEABLE_ATTRS_WORD0,
56 	NFSD_WRITEABLE_ATTRS_WORD1,
57 	NFSD_WRITEABLE_ATTRS_WORD2
58 };
59 
60 static u32 nfsd41_ex_attrmask[] = {
61 	NFSD_SUPPATTR_EXCLCREAT_WORD0,
62 	NFSD_SUPPATTR_EXCLCREAT_WORD1,
63 	NFSD_SUPPATTR_EXCLCREAT_WORD2
64 };
65 
66 static __be32
67 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
68 		   u32 *bmval, u32 *writable)
69 {
70 	struct dentry *dentry = cstate->current_fh.fh_dentry;
71 	struct svc_export *exp = cstate->current_fh.fh_export;
72 
73 	/*
74 	 * Check about attributes are supported by the NFSv4 server or not.
75 	 * According to spec, unsupported attributes return ERR_ATTRNOTSUPP.
76 	 */
77 	if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) ||
78 	    (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) ||
79 	    (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
80 		return nfserr_attrnotsupp;
81 
82 	/*
83 	 * Check FATTR4_WORD0_ACL & FATTR4_WORD0_FS_LOCATIONS can be supported
84 	 * in current environment or not.
85 	 */
86 	if (bmval[0] & FATTR4_WORD0_ACL) {
87 		if (!IS_POSIXACL(dentry->d_inode))
88 			return nfserr_attrnotsupp;
89 	}
90 	if (bmval[0] & FATTR4_WORD0_FS_LOCATIONS) {
91 		if (exp->ex_fslocs.locations == NULL)
92 			return nfserr_attrnotsupp;
93 	}
94 
95 	/*
96 	 * According to spec, read-only attributes return ERR_INVAL.
97 	 */
98 	if (writable) {
99 		if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
100 		    (bmval[2] & ~writable[2]))
101 			return nfserr_inval;
102 	}
103 
104 	return nfs_ok;
105 }
106 
107 static __be32
108 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
109 	struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
110 {
111 	__be32 status = nfs_ok;
112 
113 	if (open->op_create == NFS4_OPEN_CREATE) {
114 		if (open->op_createmode == NFS4_CREATE_UNCHECKED
115 		    || open->op_createmode == NFS4_CREATE_GUARDED)
116 			status = check_attr_support(rqstp, cstate,
117 					open->op_bmval, nfsd_attrmask);
118 		else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
119 			status = check_attr_support(rqstp, cstate,
120 					open->op_bmval, nfsd41_ex_attrmask);
121 	}
122 
123 	return status;
124 }
125 
126 static inline void
127 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
128 {
129 	fh_put(dst);
130 	dget(src->fh_dentry);
131 	if (src->fh_export)
132 		cache_get(&src->fh_export->h);
133 	*dst = *src;
134 }
135 
136 static __be32
137 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
138 {
139 	__be32 status;
140 
141 	if (open->op_truncate &&
142 		!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
143 		return nfserr_inval;
144 
145 	if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
146 		accmode |= NFSD_MAY_READ;
147 	if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
148 		accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
149 	if (open->op_share_deny & NFS4_SHARE_DENY_WRITE)
150 		accmode |= NFSD_MAY_WRITE;
151 
152 	status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
153 
154 	return status;
155 }
156 
157 static __be32
158 do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
159 {
160 	struct svc_fh resfh;
161 	__be32 status;
162 	int created = 0;
163 
164 	fh_init(&resfh, NFS4_FHSIZE);
165 	open->op_truncate = 0;
166 
167 	if (open->op_create) {
168 		/* FIXME: check session persistence and pnfs flags.
169 		 * The nfsv4.1 spec requires the following semantics:
170 		 *
171 		 * Persistent   | pNFS   | Server REQUIRED | Client Allowed
172 		 * Reply Cache  | server |                 |
173 		 * -------------+--------+-----------------+--------------------
174 		 * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
175 		 *              |        |                 | (SHOULD)
176 		 *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
177 		 *              |        |                 | (SHOULD NOT)
178 		 * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
179 		 * yes          | no     | GUARDED4        | GUARDED4
180 		 * yes          | yes    | GUARDED4        | GUARDED4
181 		 */
182 
183 		/*
184 		 * Note: create modes (UNCHECKED,GUARDED...) are the same
185 		 * in NFSv4 as in v3.
186 		 */
187 		status = nfsd_create_v3(rqstp, current_fh, open->op_fname.data,
188 					open->op_fname.len, &open->op_iattr,
189 					&resfh, open->op_createmode,
190 					(u32 *)open->op_verf.data,
191 					&open->op_truncate, &created);
192 
193 		/*
194 		 * Following rfc 3530 14.2.16, use the returned bitmask
195 		 * to indicate which attributes we used to store the
196 		 * verifier:
197 		 */
198 		if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
199 			open->op_bmval[1] = (FATTR4_WORD1_TIME_ACCESS |
200 						FATTR4_WORD1_TIME_MODIFY);
201 	} else {
202 		status = nfsd_lookup(rqstp, current_fh,
203 				     open->op_fname.data, open->op_fname.len, &resfh);
204 		fh_unlock(current_fh);
205 	}
206 	if (status)
207 		goto out;
208 
209 	set_change_info(&open->op_cinfo, current_fh);
210 	fh_dup2(current_fh, &resfh);
211 
212 	/* set reply cache */
213 	fh_copy_shallow(&open->op_stateowner->so_replay.rp_openfh,
214 			&resfh.fh_handle);
215 	if (!created)
216 		status = do_open_permission(rqstp, current_fh, open,
217 					    NFSD_MAY_NOP);
218 
219 out:
220 	fh_put(&resfh);
221 	return status;
222 }
223 
224 static __be32
225 do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
226 {
227 	__be32 status;
228 
229 	/* Only reclaims from previously confirmed clients are valid */
230 	if ((status = nfs4_check_open_reclaim(&open->op_clientid)))
231 		return status;
232 
233 	/* We don't know the target directory, and therefore can not
234 	* set the change info
235 	*/
236 
237 	memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
238 
239 	/* set replay cache */
240 	fh_copy_shallow(&open->op_stateowner->so_replay.rp_openfh,
241 			&current_fh->fh_handle);
242 
243 	open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
244 		(open->op_iattr.ia_size == 0);
245 
246 	status = do_open_permission(rqstp, current_fh, open,
247 				    NFSD_MAY_OWNER_OVERRIDE);
248 
249 	return status;
250 }
251 
252 static void
253 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
254 {
255 	struct nfsd4_sessionid *sid =
256 			(struct nfsd4_sessionid *)session->se_sessionid.data;
257 
258 	clid->cl_boot = sid->clientid.cl_boot;
259 	clid->cl_id = sid->clientid.cl_id;
260 }
261 
262 static __be32
263 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
264 	   struct nfsd4_open *open)
265 {
266 	__be32 status;
267 	struct nfsd4_compoundres *resp;
268 
269 	dprintk("NFSD: nfsd4_open filename %.*s op_stateowner %p\n",
270 		(int)open->op_fname.len, open->op_fname.data,
271 		open->op_stateowner);
272 
273 	/* This check required by spec. */
274 	if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
275 		return nfserr_inval;
276 
277 	if (nfsd4_has_session(cstate))
278 		copy_clientid(&open->op_clientid, cstate->session);
279 
280 	nfs4_lock_state();
281 
282 	/* check seqid for replay. set nfs4_owner */
283 	resp = rqstp->rq_resp;
284 	status = nfsd4_process_open1(&resp->cstate, open);
285 	if (status == nfserr_replay_me) {
286 		struct nfs4_replay *rp = &open->op_stateowner->so_replay;
287 		fh_put(&cstate->current_fh);
288 		fh_copy_shallow(&cstate->current_fh.fh_handle,
289 				&rp->rp_openfh);
290 		status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
291 		if (status)
292 			dprintk("nfsd4_open: replay failed"
293 				" restoring previous filehandle\n");
294 		else
295 			status = nfserr_replay_me;
296 	}
297 	if (status)
298 		goto out;
299 
300 	status = nfsd4_check_open_attributes(rqstp, cstate, open);
301 	if (status)
302 		goto out;
303 
304 	/* Openowner is now set, so sequence id will get bumped.  Now we need
305 	 * these checks before we do any creates: */
306 	status = nfserr_grace;
307 	if (locks_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
308 		goto out;
309 	status = nfserr_no_grace;
310 	if (!locks_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
311 		goto out;
312 
313 	switch (open->op_claim_type) {
314 		case NFS4_OPEN_CLAIM_DELEGATE_CUR:
315 		case NFS4_OPEN_CLAIM_NULL:
316 			/*
317 			 * (1) set CURRENT_FH to the file being opened,
318 			 * creating it if necessary, (2) set open->op_cinfo,
319 			 * (3) set open->op_truncate if the file is to be
320 			 * truncated after opening, (4) do permission checking.
321 			 */
322 			status = do_open_lookup(rqstp, &cstate->current_fh,
323 						open);
324 			if (status)
325 				goto out;
326 			break;
327 		case NFS4_OPEN_CLAIM_PREVIOUS:
328 			open->op_stateowner->so_confirmed = 1;
329 			/*
330 			 * The CURRENT_FH is already set to the file being
331 			 * opened.  (1) set open->op_cinfo, (2) set
332 			 * open->op_truncate if the file is to be truncated
333 			 * after opening, (3) do permission checking.
334 			*/
335 			status = do_open_fhandle(rqstp, &cstate->current_fh,
336 						 open);
337 			if (status)
338 				goto out;
339 			break;
340              	case NFS4_OPEN_CLAIM_DELEGATE_PREV:
341 			open->op_stateowner->so_confirmed = 1;
342 			dprintk("NFSD: unsupported OPEN claim type %d\n",
343 				open->op_claim_type);
344 			status = nfserr_notsupp;
345 			goto out;
346 		default:
347 			dprintk("NFSD: Invalid OPEN claim type %d\n",
348 				open->op_claim_type);
349 			status = nfserr_inval;
350 			goto out;
351 	}
352 	/*
353 	 * nfsd4_process_open2() does the actual opening of the file.  If
354 	 * successful, it (1) truncates the file if open->op_truncate was
355 	 * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
356 	 */
357 	status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
358 out:
359 	if (open->op_stateowner) {
360 		nfs4_get_stateowner(open->op_stateowner);
361 		cstate->replay_owner = open->op_stateowner;
362 	}
363 	nfs4_unlock_state();
364 	return status;
365 }
366 
367 /*
368  * filehandle-manipulating ops.
369  */
370 static __be32
371 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
372 	    struct svc_fh **getfh)
373 {
374 	if (!cstate->current_fh.fh_dentry)
375 		return nfserr_nofilehandle;
376 
377 	*getfh = &cstate->current_fh;
378 	return nfs_ok;
379 }
380 
381 static __be32
382 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
383 	    struct nfsd4_putfh *putfh)
384 {
385 	fh_put(&cstate->current_fh);
386 	cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
387 	memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
388 	       putfh->pf_fhlen);
389 	return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
390 }
391 
392 static __be32
393 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
394 		void *arg)
395 {
396 	__be32 status;
397 
398 	fh_put(&cstate->current_fh);
399 	status = exp_pseudoroot(rqstp, &cstate->current_fh);
400 	return status;
401 }
402 
403 static __be32
404 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
405 		void *arg)
406 {
407 	if (!cstate->save_fh.fh_dentry)
408 		return nfserr_restorefh;
409 
410 	fh_dup2(&cstate->current_fh, &cstate->save_fh);
411 	return nfs_ok;
412 }
413 
414 static __be32
415 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
416 	     void *arg)
417 {
418 	if (!cstate->current_fh.fh_dentry)
419 		return nfserr_nofilehandle;
420 
421 	fh_dup2(&cstate->save_fh, &cstate->current_fh);
422 	return nfs_ok;
423 }
424 
425 /*
426  * misc nfsv4 ops
427  */
428 static __be32
429 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
430 	     struct nfsd4_access *access)
431 {
432 	if (access->ac_req_access & ~NFS3_ACCESS_FULL)
433 		return nfserr_inval;
434 
435 	access->ac_resp_access = access->ac_req_access;
436 	return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
437 			   &access->ac_supported);
438 }
439 
440 static __be32
441 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
442 	     struct nfsd4_commit *commit)
443 {
444 	__be32 status;
445 
446 	u32 *p = (u32 *)commit->co_verf.data;
447 	*p++ = nfssvc_boot.tv_sec;
448 	*p++ = nfssvc_boot.tv_usec;
449 
450 	status = nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
451 			     commit->co_count);
452 	if (status == nfserr_symlink)
453 		status = nfserr_inval;
454 	return status;
455 }
456 
457 static __be32
458 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
459 	     struct nfsd4_create *create)
460 {
461 	struct svc_fh resfh;
462 	__be32 status;
463 	dev_t rdev;
464 
465 	fh_init(&resfh, NFS4_FHSIZE);
466 
467 	status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
468 			   NFSD_MAY_CREATE);
469 	if (status == nfserr_symlink)
470 		status = nfserr_notdir;
471 	if (status)
472 		return status;
473 
474 	status = check_attr_support(rqstp, cstate, create->cr_bmval,
475 				    nfsd_attrmask);
476 	if (status)
477 		return status;
478 
479 	switch (create->cr_type) {
480 	case NF4LNK:
481 		/* ugh! we have to null-terminate the linktext, or
482 		 * vfs_symlink() will choke.  it is always safe to
483 		 * null-terminate by brute force, since at worst we
484 		 * will overwrite the first byte of the create namelen
485 		 * in the XDR buffer, which has already been extracted
486 		 * during XDR decode.
487 		 */
488 		create->cr_linkname[create->cr_linklen] = 0;
489 
490 		status = nfsd_symlink(rqstp, &cstate->current_fh,
491 				      create->cr_name, create->cr_namelen,
492 				      create->cr_linkname, create->cr_linklen,
493 				      &resfh, &create->cr_iattr);
494 		break;
495 
496 	case NF4BLK:
497 		rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
498 		if (MAJOR(rdev) != create->cr_specdata1 ||
499 		    MINOR(rdev) != create->cr_specdata2)
500 			return nfserr_inval;
501 		status = nfsd_create(rqstp, &cstate->current_fh,
502 				     create->cr_name, create->cr_namelen,
503 				     &create->cr_iattr, S_IFBLK, rdev, &resfh);
504 		break;
505 
506 	case NF4CHR:
507 		rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
508 		if (MAJOR(rdev) != create->cr_specdata1 ||
509 		    MINOR(rdev) != create->cr_specdata2)
510 			return nfserr_inval;
511 		status = nfsd_create(rqstp, &cstate->current_fh,
512 				     create->cr_name, create->cr_namelen,
513 				     &create->cr_iattr,S_IFCHR, rdev, &resfh);
514 		break;
515 
516 	case NF4SOCK:
517 		status = nfsd_create(rqstp, &cstate->current_fh,
518 				     create->cr_name, create->cr_namelen,
519 				     &create->cr_iattr, S_IFSOCK, 0, &resfh);
520 		break;
521 
522 	case NF4FIFO:
523 		status = nfsd_create(rqstp, &cstate->current_fh,
524 				     create->cr_name, create->cr_namelen,
525 				     &create->cr_iattr, S_IFIFO, 0, &resfh);
526 		break;
527 
528 	case NF4DIR:
529 		create->cr_iattr.ia_valid &= ~ATTR_SIZE;
530 		status = nfsd_create(rqstp, &cstate->current_fh,
531 				     create->cr_name, create->cr_namelen,
532 				     &create->cr_iattr, S_IFDIR, 0, &resfh);
533 		break;
534 
535 	default:
536 		status = nfserr_badtype;
537 	}
538 
539 	if (!status) {
540 		fh_unlock(&cstate->current_fh);
541 		set_change_info(&create->cr_cinfo, &cstate->current_fh);
542 		fh_dup2(&cstate->current_fh, &resfh);
543 	}
544 
545 	fh_put(&resfh);
546 	return status;
547 }
548 
549 static __be32
550 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
551 	      struct nfsd4_getattr *getattr)
552 {
553 	__be32 status;
554 
555 	status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
556 	if (status)
557 		return status;
558 
559 	if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
560 		return nfserr_inval;
561 
562 	getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
563 	getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
564 	getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
565 
566 	getattr->ga_fhp = &cstate->current_fh;
567 	return nfs_ok;
568 }
569 
570 static __be32
571 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
572 	   struct nfsd4_link *link)
573 {
574 	__be32 status = nfserr_nofilehandle;
575 
576 	if (!cstate->save_fh.fh_dentry)
577 		return status;
578 	status = nfsd_link(rqstp, &cstate->current_fh,
579 			   link->li_name, link->li_namelen, &cstate->save_fh);
580 	if (!status)
581 		set_change_info(&link->li_cinfo, &cstate->current_fh);
582 	return status;
583 }
584 
585 static __be32
586 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
587 	      void *arg)
588 {
589 	struct svc_fh tmp_fh;
590 	__be32 ret;
591 
592 	fh_init(&tmp_fh, NFS4_FHSIZE);
593 	ret = exp_pseudoroot(rqstp, &tmp_fh);
594 	if (ret)
595 		return ret;
596 	if (tmp_fh.fh_dentry == cstate->current_fh.fh_dentry) {
597 		fh_put(&tmp_fh);
598 		return nfserr_noent;
599 	}
600 	fh_put(&tmp_fh);
601 	return nfsd_lookup(rqstp, &cstate->current_fh,
602 			   "..", 2, &cstate->current_fh);
603 }
604 
605 static __be32
606 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
607 	     struct nfsd4_lookup *lookup)
608 {
609 	return nfsd_lookup(rqstp, &cstate->current_fh,
610 			   lookup->lo_name, lookup->lo_len,
611 			   &cstate->current_fh);
612 }
613 
614 static __be32
615 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
616 	   struct nfsd4_read *read)
617 {
618 	__be32 status;
619 
620 	/* no need to check permission - this will be done in nfsd_read() */
621 
622 	read->rd_filp = NULL;
623 	if (read->rd_offset >= OFFSET_MAX)
624 		return nfserr_inval;
625 
626 	nfs4_lock_state();
627 	/* check stateid */
628 	if ((status = nfs4_preprocess_stateid_op(cstate, &read->rd_stateid,
629 						 RD_STATE, &read->rd_filp))) {
630 		dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
631 		goto out;
632 	}
633 	if (read->rd_filp)
634 		get_file(read->rd_filp);
635 	status = nfs_ok;
636 out:
637 	nfs4_unlock_state();
638 	read->rd_rqstp = rqstp;
639 	read->rd_fhp = &cstate->current_fh;
640 	return status;
641 }
642 
643 static __be32
644 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
645 	      struct nfsd4_readdir *readdir)
646 {
647 	u64 cookie = readdir->rd_cookie;
648 	static const nfs4_verifier zeroverf;
649 
650 	/* no need to check permission - this will be done in nfsd_readdir() */
651 
652 	if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
653 		return nfserr_inval;
654 
655 	readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
656 	readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
657 	readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
658 
659 	if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) ||
660 	    (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
661 		return nfserr_bad_cookie;
662 
663 	readdir->rd_rqstp = rqstp;
664 	readdir->rd_fhp = &cstate->current_fh;
665 	return nfs_ok;
666 }
667 
668 static __be32
669 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
670 	       struct nfsd4_readlink *readlink)
671 {
672 	readlink->rl_rqstp = rqstp;
673 	readlink->rl_fhp = &cstate->current_fh;
674 	return nfs_ok;
675 }
676 
677 static __be32
678 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
679 	     struct nfsd4_remove *remove)
680 {
681 	__be32 status;
682 
683 	if (locks_in_grace())
684 		return nfserr_grace;
685 	status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
686 			     remove->rm_name, remove->rm_namelen);
687 	if (status == nfserr_symlink)
688 		return nfserr_notdir;
689 	if (!status) {
690 		fh_unlock(&cstate->current_fh);
691 		set_change_info(&remove->rm_cinfo, &cstate->current_fh);
692 	}
693 	return status;
694 }
695 
696 static __be32
697 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
698 	     struct nfsd4_rename *rename)
699 {
700 	__be32 status = nfserr_nofilehandle;
701 
702 	if (!cstate->save_fh.fh_dentry)
703 		return status;
704 	if (locks_in_grace() && !(cstate->save_fh.fh_export->ex_flags
705 					& NFSEXP_NOSUBTREECHECK))
706 		return nfserr_grace;
707 	status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
708 			     rename->rn_snamelen, &cstate->current_fh,
709 			     rename->rn_tname, rename->rn_tnamelen);
710 
711 	/* the underlying filesystem returns different error's than required
712 	 * by NFSv4. both save_fh and current_fh have been verified.. */
713 	if (status == nfserr_isdir)
714 		status = nfserr_exist;
715 	else if ((status == nfserr_notdir) &&
716                   (S_ISDIR(cstate->save_fh.fh_dentry->d_inode->i_mode) &&
717                    S_ISDIR(cstate->current_fh.fh_dentry->d_inode->i_mode)))
718 		status = nfserr_exist;
719 	else if (status == nfserr_symlink)
720 		status = nfserr_notdir;
721 
722 	if (!status) {
723 		set_change_info(&rename->rn_sinfo, &cstate->current_fh);
724 		set_change_info(&rename->rn_tinfo, &cstate->save_fh);
725 	}
726 	return status;
727 }
728 
729 static __be32
730 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
731 	      struct nfsd4_secinfo *secinfo)
732 {
733 	struct svc_fh resfh;
734 	struct svc_export *exp;
735 	struct dentry *dentry;
736 	__be32 err;
737 
738 	fh_init(&resfh, NFS4_FHSIZE);
739 	err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
740 				    secinfo->si_name, secinfo->si_namelen,
741 				    &exp, &dentry);
742 	if (err)
743 		return err;
744 	if (dentry->d_inode == NULL) {
745 		exp_put(exp);
746 		err = nfserr_noent;
747 	} else
748 		secinfo->si_exp = exp;
749 	dput(dentry);
750 	return err;
751 }
752 
753 static __be32
754 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
755 	      struct nfsd4_setattr *setattr)
756 {
757 	__be32 status = nfs_ok;
758 
759 	if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
760 		nfs4_lock_state();
761 		status = nfs4_preprocess_stateid_op(cstate,
762 			&setattr->sa_stateid, WR_STATE, NULL);
763 		nfs4_unlock_state();
764 		if (status) {
765 			dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
766 			return status;
767 		}
768 	}
769 	status = mnt_want_write(cstate->current_fh.fh_export->ex_path.mnt);
770 	if (status)
771 		return status;
772 	status = nfs_ok;
773 
774 	status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
775 				    nfsd_attrmask);
776 	if (status)
777 		goto out;
778 
779 	if (setattr->sa_acl != NULL)
780 		status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
781 					    setattr->sa_acl);
782 	if (status)
783 		goto out;
784 	status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
785 				0, (time_t)0);
786 out:
787 	mnt_drop_write(cstate->current_fh.fh_export->ex_path.mnt);
788 	return status;
789 }
790 
791 static __be32
792 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
793 	    struct nfsd4_write *write)
794 {
795 	stateid_t *stateid = &write->wr_stateid;
796 	struct file *filp = NULL;
797 	u32 *p;
798 	__be32 status = nfs_ok;
799 	unsigned long cnt;
800 
801 	/* no need to check permission - this will be done in nfsd_write() */
802 
803 	if (write->wr_offset >= OFFSET_MAX)
804 		return nfserr_inval;
805 
806 	nfs4_lock_state();
807 	status = nfs4_preprocess_stateid_op(cstate, stateid, WR_STATE, &filp);
808 	if (filp)
809 		get_file(filp);
810 	nfs4_unlock_state();
811 
812 	if (status) {
813 		dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
814 		return status;
815 	}
816 
817 	cnt = write->wr_buflen;
818 	write->wr_how_written = write->wr_stable_how;
819 	p = (u32 *)write->wr_verifier.data;
820 	*p++ = nfssvc_boot.tv_sec;
821 	*p++ = nfssvc_boot.tv_usec;
822 
823 	status =  nfsd_write(rqstp, &cstate->current_fh, filp,
824 			     write->wr_offset, rqstp->rq_vec, write->wr_vlen,
825 			     &cnt, &write->wr_how_written);
826 	if (filp)
827 		fput(filp);
828 
829 	write->wr_bytes_written = cnt;
830 
831 	if (status == nfserr_symlink)
832 		status = nfserr_inval;
833 	return status;
834 }
835 
836 /* This routine never returns NFS_OK!  If there are no other errors, it
837  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
838  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
839  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
840  */
841 static __be32
842 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
843 	     struct nfsd4_verify *verify)
844 {
845 	__be32 *buf, *p;
846 	int count;
847 	__be32 status;
848 
849 	status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
850 	if (status)
851 		return status;
852 
853 	status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
854 	if (status)
855 		return status;
856 
857 	if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
858 	    || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
859 		return nfserr_inval;
860 	if (verify->ve_attrlen & 3)
861 		return nfserr_inval;
862 
863 	/* count in words:
864 	 *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
865 	 */
866 	count = 4 + (verify->ve_attrlen >> 2);
867 	buf = kmalloc(count << 2, GFP_KERNEL);
868 	if (!buf)
869 		return nfserr_resource;
870 
871 	status = nfsd4_encode_fattr(&cstate->current_fh,
872 				    cstate->current_fh.fh_export,
873 				    cstate->current_fh.fh_dentry, buf,
874 				    &count, verify->ve_bmval,
875 				    rqstp, 0);
876 
877 	/* this means that nfsd4_encode_fattr() ran out of space */
878 	if (status == nfserr_resource && count == 0)
879 		status = nfserr_not_same;
880 	if (status)
881 		goto out_kfree;
882 
883 	/* skip bitmap */
884 	p = buf + 1 + ntohl(buf[0]);
885 	status = nfserr_not_same;
886 	if (ntohl(*p++) != verify->ve_attrlen)
887 		goto out_kfree;
888 	if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
889 		status = nfserr_same;
890 
891 out_kfree:
892 	kfree(buf);
893 	return status;
894 }
895 
896 static __be32
897 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
898 	      struct nfsd4_verify *verify)
899 {
900 	__be32 status;
901 
902 	status = _nfsd4_verify(rqstp, cstate, verify);
903 	return status == nfserr_not_same ? nfs_ok : status;
904 }
905 
906 static __be32
907 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
908 	     struct nfsd4_verify *verify)
909 {
910 	__be32 status;
911 
912 	status = _nfsd4_verify(rqstp, cstate, verify);
913 	return status == nfserr_same ? nfs_ok : status;
914 }
915 
916 /*
917  * NULL call.
918  */
919 static __be32
920 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
921 {
922 	return nfs_ok;
923 }
924 
925 static inline void nfsd4_increment_op_stats(u32 opnum)
926 {
927 	if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
928 		nfsdstats.nfs4_opcount[opnum]++;
929 }
930 
931 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
932 			      void *);
933 enum nfsd4_op_flags {
934 	ALLOWED_WITHOUT_FH = 1 << 0,	/* No current filehandle required */
935 	ALLOWED_ON_ABSENT_FS = 2 << 0,	/* ops processed on absent fs */
936 	ALLOWED_AS_FIRST_OP = 3 << 0,	/* ops reqired first in compound */
937 };
938 
939 struct nfsd4_operation {
940 	nfsd4op_func op_func;
941 	u32 op_flags;
942 	char *op_name;
943 };
944 
945 static struct nfsd4_operation nfsd4_ops[];
946 
947 static const char *nfsd4_op_name(unsigned opnum);
948 
949 /*
950  * This is a replay of a compound for which no cache entry pages
951  * were used. Encode the sequence operation, and if cachethis is FALSE
952  * encode the uncache rep error on the next operation.
953  */
954 static __be32
955 nfsd4_enc_uncached_replay(struct nfsd4_compoundargs *args,
956 			 struct nfsd4_compoundres *resp)
957 {
958 	struct nfsd4_op *op;
959 
960 	dprintk("--> %s resp->opcnt %d ce_cachethis %u \n", __func__,
961 		resp->opcnt, resp->cstate.slot->sl_cache_entry.ce_cachethis);
962 
963 	/* Encode the replayed sequence operation */
964 	BUG_ON(resp->opcnt != 1);
965 	op = &args->ops[resp->opcnt - 1];
966 	nfsd4_encode_operation(resp, op);
967 
968 	/*return nfserr_retry_uncached_rep in next operation. */
969 	if (resp->cstate.slot->sl_cache_entry.ce_cachethis == 0) {
970 		op = &args->ops[resp->opcnt++];
971 		op->status = nfserr_retry_uncached_rep;
972 		nfsd4_encode_operation(resp, op);
973 	}
974 	return op->status;
975 }
976 
977 /*
978  * Enforce NFSv4.1 COMPOUND ordering rules.
979  *
980  * TODO:
981  * - enforce NFS4ERR_NOT_ONLY_OP,
982  * - DESTROY_SESSION MUST be the final operation in the COMPOUND request.
983  */
984 static bool nfs41_op_ordering_ok(struct nfsd4_compoundargs *args)
985 {
986 	if (args->minorversion && args->opcnt > 0) {
987 		struct nfsd4_op *op = &args->ops[0];
988 		return (op->status == nfserr_op_illegal) ||
989 		       (nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP);
990 	}
991 	return true;
992 }
993 
994 /*
995  * COMPOUND call.
996  */
997 static __be32
998 nfsd4_proc_compound(struct svc_rqst *rqstp,
999 		    struct nfsd4_compoundargs *args,
1000 		    struct nfsd4_compoundres *resp)
1001 {
1002 	struct nfsd4_op	*op;
1003 	struct nfsd4_operation *opdesc;
1004 	struct nfsd4_compound_state *cstate = &resp->cstate;
1005 	int		slack_bytes;
1006 	__be32		status;
1007 
1008 	resp->xbuf = &rqstp->rq_res;
1009 	resp->p = rqstp->rq_res.head[0].iov_base +
1010 						rqstp->rq_res.head[0].iov_len;
1011 	resp->tagp = resp->p;
1012 	/* reserve space for: taglen, tag, and opcnt */
1013 	resp->p += 2 + XDR_QUADLEN(args->taglen);
1014 	resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
1015 	resp->taglen = args->taglen;
1016 	resp->tag = args->tag;
1017 	resp->opcnt = 0;
1018 	resp->rqstp = rqstp;
1019 	resp->cstate.minorversion = args->minorversion;
1020 	resp->cstate.replay_owner = NULL;
1021 	fh_init(&resp->cstate.current_fh, NFS4_FHSIZE);
1022 	fh_init(&resp->cstate.save_fh, NFS4_FHSIZE);
1023 	/* Use the deferral mechanism only for NFSv4.0 compounds */
1024 	rqstp->rq_usedeferral = (args->minorversion == 0);
1025 
1026 	/*
1027 	 * According to RFC3010, this takes precedence over all other errors.
1028 	 */
1029 	status = nfserr_minor_vers_mismatch;
1030 	if (args->minorversion > nfsd_supported_minorversion)
1031 		goto out;
1032 
1033 	if (!nfs41_op_ordering_ok(args)) {
1034 		op = &args->ops[0];
1035 		op->status = nfserr_sequence_pos;
1036 		goto encode_op;
1037 	}
1038 
1039 	status = nfs_ok;
1040 	while (!status && resp->opcnt < args->opcnt) {
1041 		op = &args->ops[resp->opcnt++];
1042 
1043 		dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1044 			resp->opcnt, args->opcnt, op->opnum,
1045 			nfsd4_op_name(op->opnum));
1046 		/*
1047 		 * The XDR decode routines may have pre-set op->status;
1048 		 * for example, if there is a miscellaneous XDR error
1049 		 * it will be set to nfserr_bad_xdr.
1050 		 */
1051 		if (op->status)
1052 			goto encode_op;
1053 
1054 		/* We must be able to encode a successful response to
1055 		 * this operation, with enough room left over to encode a
1056 		 * failed response to the next operation.  If we don't
1057 		 * have enough room, fail with ERR_RESOURCE.
1058 		 */
1059 		slack_bytes = (char *)resp->end - (char *)resp->p;
1060 		if (slack_bytes < COMPOUND_SLACK_SPACE
1061 				+ COMPOUND_ERR_SLACK_SPACE) {
1062 			BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
1063 			op->status = nfserr_resource;
1064 			goto encode_op;
1065 		}
1066 
1067 		opdesc = &nfsd4_ops[op->opnum];
1068 
1069 		if (!cstate->current_fh.fh_dentry) {
1070 			if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1071 				op->status = nfserr_nofilehandle;
1072 				goto encode_op;
1073 			}
1074 		} else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
1075 			  !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1076 			op->status = nfserr_moved;
1077 			goto encode_op;
1078 		}
1079 
1080 		if (opdesc->op_func)
1081 			op->status = opdesc->op_func(rqstp, cstate, &op->u);
1082 		else
1083 			BUG_ON(op->status == nfs_ok);
1084 
1085 encode_op:
1086 		/* Only from SEQUENCE or CREATE_SESSION */
1087 		if (resp->cstate.status == nfserr_replay_cache) {
1088 			dprintk("%s NFS4.1 replay from cache\n", __func__);
1089 			if (nfsd4_not_cached(resp))
1090 				status = nfsd4_enc_uncached_replay(args, resp);
1091 			else
1092 				status = op->status;
1093 			goto out;
1094 		}
1095 		if (op->status == nfserr_replay_me) {
1096 			op->replay = &cstate->replay_owner->so_replay;
1097 			nfsd4_encode_replay(resp, op);
1098 			status = op->status = op->replay->rp_status;
1099 		} else {
1100 			nfsd4_encode_operation(resp, op);
1101 			status = op->status;
1102 		}
1103 
1104 		dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1105 			args->ops, args->opcnt, resp->opcnt, op->opnum,
1106 			be32_to_cpu(status));
1107 
1108 		if (cstate->replay_owner) {
1109 			nfs4_put_stateowner(cstate->replay_owner);
1110 			cstate->replay_owner = NULL;
1111 		}
1112 		/* XXX Ugh, we need to get rid of this kind of special case: */
1113 		if (op->opnum == OP_READ && op->u.read.rd_filp)
1114 			fput(op->u.read.rd_filp);
1115 
1116 		nfsd4_increment_op_stats(op->opnum);
1117 	}
1118 	if (!rqstp->rq_usedeferral && status == nfserr_dropit) {
1119 		dprintk("%s Dropit - send NFS4ERR_DELAY\n", __func__);
1120 		status = nfserr_jukebox;
1121 	}
1122 
1123 	resp->cstate.status = status;
1124 	fh_put(&resp->cstate.current_fh);
1125 	fh_put(&resp->cstate.save_fh);
1126 	BUG_ON(resp->cstate.replay_owner);
1127 out:
1128 	nfsd4_release_compoundargs(args);
1129 	/* Reset deferral mechanism for RPC deferrals */
1130 	rqstp->rq_usedeferral = 1;
1131 	dprintk("nfsv4 compound returned %d\n", ntohl(status));
1132 	return status;
1133 }
1134 
1135 static struct nfsd4_operation nfsd4_ops[] = {
1136 	[OP_ACCESS] = {
1137 		.op_func = (nfsd4op_func)nfsd4_access,
1138 		.op_name = "OP_ACCESS",
1139 	},
1140 	[OP_CLOSE] = {
1141 		.op_func = (nfsd4op_func)nfsd4_close,
1142 		.op_name = "OP_CLOSE",
1143 	},
1144 	[OP_COMMIT] = {
1145 		.op_func = (nfsd4op_func)nfsd4_commit,
1146 		.op_name = "OP_COMMIT",
1147 	},
1148 	[OP_CREATE] = {
1149 		.op_func = (nfsd4op_func)nfsd4_create,
1150 		.op_name = "OP_CREATE",
1151 	},
1152 	[OP_DELEGRETURN] = {
1153 		.op_func = (nfsd4op_func)nfsd4_delegreturn,
1154 		.op_name = "OP_DELEGRETURN",
1155 	},
1156 	[OP_GETATTR] = {
1157 		.op_func = (nfsd4op_func)nfsd4_getattr,
1158 		.op_flags = ALLOWED_ON_ABSENT_FS,
1159 		.op_name = "OP_GETATTR",
1160 	},
1161 	[OP_GETFH] = {
1162 		.op_func = (nfsd4op_func)nfsd4_getfh,
1163 		.op_name = "OP_GETFH",
1164 	},
1165 	[OP_LINK] = {
1166 		.op_func = (nfsd4op_func)nfsd4_link,
1167 		.op_name = "OP_LINK",
1168 	},
1169 	[OP_LOCK] = {
1170 		.op_func = (nfsd4op_func)nfsd4_lock,
1171 		.op_name = "OP_LOCK",
1172 	},
1173 	[OP_LOCKT] = {
1174 		.op_func = (nfsd4op_func)nfsd4_lockt,
1175 		.op_name = "OP_LOCKT",
1176 	},
1177 	[OP_LOCKU] = {
1178 		.op_func = (nfsd4op_func)nfsd4_locku,
1179 		.op_name = "OP_LOCKU",
1180 	},
1181 	[OP_LOOKUP] = {
1182 		.op_func = (nfsd4op_func)nfsd4_lookup,
1183 		.op_name = "OP_LOOKUP",
1184 	},
1185 	[OP_LOOKUPP] = {
1186 		.op_func = (nfsd4op_func)nfsd4_lookupp,
1187 		.op_name = "OP_LOOKUPP",
1188 	},
1189 	[OP_NVERIFY] = {
1190 		.op_func = (nfsd4op_func)nfsd4_nverify,
1191 		.op_name = "OP_NVERIFY",
1192 	},
1193 	[OP_OPEN] = {
1194 		.op_func = (nfsd4op_func)nfsd4_open,
1195 		.op_name = "OP_OPEN",
1196 	},
1197 	[OP_OPEN_CONFIRM] = {
1198 		.op_func = (nfsd4op_func)nfsd4_open_confirm,
1199 		.op_name = "OP_OPEN_CONFIRM",
1200 	},
1201 	[OP_OPEN_DOWNGRADE] = {
1202 		.op_func = (nfsd4op_func)nfsd4_open_downgrade,
1203 		.op_name = "OP_OPEN_DOWNGRADE",
1204 	},
1205 	[OP_PUTFH] = {
1206 		.op_func = (nfsd4op_func)nfsd4_putfh,
1207 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1208 		.op_name = "OP_PUTFH",
1209 	},
1210 	[OP_PUTPUBFH] = {
1211 		.op_func = (nfsd4op_func)nfsd4_putrootfh,
1212 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1213 		.op_name = "OP_PUTPUBFH",
1214 	},
1215 	[OP_PUTROOTFH] = {
1216 		.op_func = (nfsd4op_func)nfsd4_putrootfh,
1217 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1218 		.op_name = "OP_PUTROOTFH",
1219 	},
1220 	[OP_READ] = {
1221 		.op_func = (nfsd4op_func)nfsd4_read,
1222 		.op_name = "OP_READ",
1223 	},
1224 	[OP_READDIR] = {
1225 		.op_func = (nfsd4op_func)nfsd4_readdir,
1226 		.op_name = "OP_READDIR",
1227 	},
1228 	[OP_READLINK] = {
1229 		.op_func = (nfsd4op_func)nfsd4_readlink,
1230 		.op_name = "OP_READLINK",
1231 	},
1232 	[OP_REMOVE] = {
1233 		.op_func = (nfsd4op_func)nfsd4_remove,
1234 		.op_name = "OP_REMOVE",
1235 	},
1236 	[OP_RENAME] = {
1237 		.op_name = "OP_RENAME",
1238 		.op_func = (nfsd4op_func)nfsd4_rename,
1239 	},
1240 	[OP_RENEW] = {
1241 		.op_func = (nfsd4op_func)nfsd4_renew,
1242 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1243 		.op_name = "OP_RENEW",
1244 	},
1245 	[OP_RESTOREFH] = {
1246 		.op_func = (nfsd4op_func)nfsd4_restorefh,
1247 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1248 		.op_name = "OP_RESTOREFH",
1249 	},
1250 	[OP_SAVEFH] = {
1251 		.op_func = (nfsd4op_func)nfsd4_savefh,
1252 		.op_name = "OP_SAVEFH",
1253 	},
1254 	[OP_SECINFO] = {
1255 		.op_func = (nfsd4op_func)nfsd4_secinfo,
1256 		.op_name = "OP_SECINFO",
1257 	},
1258 	[OP_SETATTR] = {
1259 		.op_func = (nfsd4op_func)nfsd4_setattr,
1260 		.op_name = "OP_SETATTR",
1261 	},
1262 	[OP_SETCLIENTID] = {
1263 		.op_func = (nfsd4op_func)nfsd4_setclientid,
1264 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1265 		.op_name = "OP_SETCLIENTID",
1266 	},
1267 	[OP_SETCLIENTID_CONFIRM] = {
1268 		.op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1269 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1270 		.op_name = "OP_SETCLIENTID_CONFIRM",
1271 	},
1272 	[OP_VERIFY] = {
1273 		.op_func = (nfsd4op_func)nfsd4_verify,
1274 		.op_name = "OP_VERIFY",
1275 	},
1276 	[OP_WRITE] = {
1277 		.op_func = (nfsd4op_func)nfsd4_write,
1278 		.op_name = "OP_WRITE",
1279 	},
1280 	[OP_RELEASE_LOCKOWNER] = {
1281 		.op_func = (nfsd4op_func)nfsd4_release_lockowner,
1282 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1283 		.op_name = "OP_RELEASE_LOCKOWNER",
1284 	},
1285 
1286 	/* NFSv4.1 operations */
1287 	[OP_EXCHANGE_ID] = {
1288 		.op_func = (nfsd4op_func)nfsd4_exchange_id,
1289 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1290 		.op_name = "OP_EXCHANGE_ID",
1291 	},
1292 	[OP_CREATE_SESSION] = {
1293 		.op_func = (nfsd4op_func)nfsd4_create_session,
1294 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1295 		.op_name = "OP_CREATE_SESSION",
1296 	},
1297 	[OP_DESTROY_SESSION] = {
1298 		.op_func = (nfsd4op_func)nfsd4_destroy_session,
1299 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1300 		.op_name = "OP_DESTROY_SESSION",
1301 	},
1302 	[OP_SEQUENCE] = {
1303 		.op_func = (nfsd4op_func)nfsd4_sequence,
1304 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1305 		.op_name = "OP_SEQUENCE",
1306 	},
1307 };
1308 
1309 static const char *nfsd4_op_name(unsigned opnum)
1310 {
1311 	if (opnum < ARRAY_SIZE(nfsd4_ops))
1312 		return nfsd4_ops[opnum].op_name;
1313 	return "unknown_operation";
1314 }
1315 
1316 #define nfsd4_voidres			nfsd4_voidargs
1317 struct nfsd4_voidargs { int dummy; };
1318 
1319 /*
1320  * TODO: At the present time, the NFSv4 server does not do XID caching
1321  * of requests.  Implementing XID caching would not be a serious problem,
1322  * although it would require a mild change in interfaces since one
1323  * doesn't know whether an NFSv4 request is idempotent until after the
1324  * XDR decode.  However, XID caching totally confuses pynfs (Peter
1325  * Astrand's regression testsuite for NFSv4 servers), which reuses
1326  * XID's liberally, so I've left it unimplemented until pynfs generates
1327  * better XID's.
1328  */
1329 static struct svc_procedure		nfsd_procedures4[2] = {
1330 	[NFSPROC4_NULL] = {
1331 		.pc_func = (svc_procfunc) nfsd4_proc_null,
1332 		.pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1333 		.pc_argsize = sizeof(struct nfsd4_voidargs),
1334 		.pc_ressize = sizeof(struct nfsd4_voidres),
1335 		.pc_cachetype = RC_NOCACHE,
1336 		.pc_xdrressize = 1,
1337 	},
1338 	[NFSPROC4_COMPOUND] = {
1339 		.pc_func = (svc_procfunc) nfsd4_proc_compound,
1340 		.pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1341 		.pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1342 		.pc_argsize = sizeof(struct nfsd4_compoundargs),
1343 		.pc_ressize = sizeof(struct nfsd4_compoundres),
1344 		.pc_cachetype = RC_NOCACHE,
1345 		.pc_xdrressize = NFSD_BUFSIZE/4,
1346 	},
1347 };
1348 
1349 struct svc_version	nfsd_version4 = {
1350 		.vs_vers	= 4,
1351 		.vs_nproc	= 2,
1352 		.vs_proc	= nfsd_procedures4,
1353 		.vs_dispatch	= nfsd_dispatch,
1354 		.vs_xdrsize	= NFS4_SVC_XDRSIZE,
1355 };
1356 
1357 /*
1358  * Local variables:
1359  *  c-basic-offset: 8
1360  * End:
1361  */
1362