xref: /openbmc/linux/fs/nfsd/nfs4proc.c (revision b34e08d5)
1 /*
2  *  Server-side procedures for NFSv4.
3  *
4  *  Copyright (c) 2002 The Regents of the University of Michigan.
5  *  All rights reserved.
6  *
7  *  Kendrick Smith <kmsmith@umich.edu>
8  *  Andy Adamson   <andros@umich.edu>
9  *
10  *  Redistribution and use in source and binary forms, with or without
11  *  modification, are permitted provided that the following conditions
12  *  are met:
13  *
14  *  1. Redistributions of source code must retain the above copyright
15  *     notice, this list of conditions and the following disclaimer.
16  *  2. Redistributions in binary form must reproduce the above copyright
17  *     notice, this list of conditions and the following disclaimer in the
18  *     documentation and/or other materials provided with the distribution.
19  *  3. Neither the name of the University nor the names of its
20  *     contributors may be used to endorse or promote products derived
21  *     from this software without specific prior written permission.
22  *
23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34  */
35 #include <linux/file.h>
36 #include <linux/slab.h>
37 
38 #include "idmap.h"
39 #include "cache.h"
40 #include "xdr4.h"
41 #include "vfs.h"
42 #include "current_stateid.h"
43 #include "netns.h"
44 #include "acl.h"
45 
46 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
47 #include <linux/security.h>
48 
49 static inline void
50 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
51 {
52 	struct inode *inode = resfh->fh_dentry->d_inode;
53 	int status;
54 
55 	mutex_lock(&inode->i_mutex);
56 	status = security_inode_setsecctx(resfh->fh_dentry,
57 		label->data, label->len);
58 	mutex_unlock(&inode->i_mutex);
59 
60 	if (status)
61 		/*
62 		 * XXX: We should really fail the whole open, but we may
63 		 * already have created a new file, so it may be too
64 		 * late.  For now this seems the least of evils:
65 		 */
66 		bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
67 
68 	return;
69 }
70 #else
71 static inline void
72 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
73 { }
74 #endif
75 
76 #define NFSDDBG_FACILITY		NFSDDBG_PROC
77 
78 static u32 nfsd_attrmask[] = {
79 	NFSD_WRITEABLE_ATTRS_WORD0,
80 	NFSD_WRITEABLE_ATTRS_WORD1,
81 	NFSD_WRITEABLE_ATTRS_WORD2
82 };
83 
84 static u32 nfsd41_ex_attrmask[] = {
85 	NFSD_SUPPATTR_EXCLCREAT_WORD0,
86 	NFSD_SUPPATTR_EXCLCREAT_WORD1,
87 	NFSD_SUPPATTR_EXCLCREAT_WORD2
88 };
89 
90 static __be32
91 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
92 		   u32 *bmval, u32 *writable)
93 {
94 	struct dentry *dentry = cstate->current_fh.fh_dentry;
95 
96 	/*
97 	 * Check about attributes are supported by the NFSv4 server or not.
98 	 * According to spec, unsupported attributes return ERR_ATTRNOTSUPP.
99 	 */
100 	if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) ||
101 	    (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) ||
102 	    (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
103 		return nfserr_attrnotsupp;
104 
105 	/*
106 	 * Check FATTR4_WORD0_ACL can be supported
107 	 * in current environment or not.
108 	 */
109 	if (bmval[0] & FATTR4_WORD0_ACL) {
110 		if (!IS_POSIXACL(dentry->d_inode))
111 			return nfserr_attrnotsupp;
112 	}
113 
114 	/*
115 	 * According to spec, read-only attributes return ERR_INVAL.
116 	 */
117 	if (writable) {
118 		if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
119 		    (bmval[2] & ~writable[2]))
120 			return nfserr_inval;
121 	}
122 
123 	return nfs_ok;
124 }
125 
126 static __be32
127 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
128 	struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
129 {
130 	__be32 status = nfs_ok;
131 
132 	if (open->op_create == NFS4_OPEN_CREATE) {
133 		if (open->op_createmode == NFS4_CREATE_UNCHECKED
134 		    || open->op_createmode == NFS4_CREATE_GUARDED)
135 			status = check_attr_support(rqstp, cstate,
136 					open->op_bmval, nfsd_attrmask);
137 		else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
138 			status = check_attr_support(rqstp, cstate,
139 					open->op_bmval, nfsd41_ex_attrmask);
140 	}
141 
142 	return status;
143 }
144 
145 static int
146 is_create_with_attrs(struct nfsd4_open *open)
147 {
148 	return open->op_create == NFS4_OPEN_CREATE
149 		&& (open->op_createmode == NFS4_CREATE_UNCHECKED
150 		    || open->op_createmode == NFS4_CREATE_GUARDED
151 		    || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
152 }
153 
154 /*
155  * if error occurs when setting the acl, just clear the acl bit
156  * in the returned attr bitmap.
157  */
158 static void
159 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
160 		struct nfs4_acl *acl, u32 *bmval)
161 {
162 	__be32 status;
163 
164 	status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
165 	if (status)
166 		/*
167 		 * We should probably fail the whole open at this point,
168 		 * but we've already created the file, so it's too late;
169 		 * So this seems the least of evils:
170 		 */
171 		bmval[0] &= ~FATTR4_WORD0_ACL;
172 }
173 
174 static inline void
175 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
176 {
177 	fh_put(dst);
178 	dget(src->fh_dentry);
179 	if (src->fh_export)
180 		cache_get(&src->fh_export->h);
181 	*dst = *src;
182 }
183 
184 static __be32
185 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
186 {
187 	__be32 status;
188 
189 	if (open->op_truncate &&
190 		!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
191 		return nfserr_inval;
192 
193 	accmode |= NFSD_MAY_READ_IF_EXEC;
194 
195 	if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
196 		accmode |= NFSD_MAY_READ;
197 	if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
198 		accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
199 	if (open->op_share_deny & NFS4_SHARE_DENY_READ)
200 		accmode |= NFSD_MAY_WRITE;
201 
202 	status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
203 
204 	return status;
205 }
206 
207 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
208 {
209 	umode_t mode = fh->fh_dentry->d_inode->i_mode;
210 
211 	if (S_ISREG(mode))
212 		return nfs_ok;
213 	if (S_ISDIR(mode))
214 		return nfserr_isdir;
215 	/*
216 	 * Using err_symlink as our catch-all case may look odd; but
217 	 * there's no other obvious error for this case in 4.0, and we
218 	 * happen to know that it will cause the linux v4 client to do
219 	 * the right thing on attempts to open something other than a
220 	 * regular file.
221 	 */
222 	return nfserr_symlink;
223 }
224 
225 static void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh *resfh)
226 {
227 	if (nfsd4_has_session(cstate))
228 		return;
229 	fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
230 			&resfh->fh_handle);
231 }
232 
233 static __be32
234 do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh **resfh)
235 {
236 	struct svc_fh *current_fh = &cstate->current_fh;
237 	int accmode;
238 	__be32 status;
239 
240 	*resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
241 	if (!*resfh)
242 		return nfserr_jukebox;
243 	fh_init(*resfh, NFS4_FHSIZE);
244 	open->op_truncate = 0;
245 
246 	if (open->op_create) {
247 		/* FIXME: check session persistence and pnfs flags.
248 		 * The nfsv4.1 spec requires the following semantics:
249 		 *
250 		 * Persistent   | pNFS   | Server REQUIRED | Client Allowed
251 		 * Reply Cache  | server |                 |
252 		 * -------------+--------+-----------------+--------------------
253 		 * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
254 		 *              |        |                 | (SHOULD)
255 		 *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
256 		 *              |        |                 | (SHOULD NOT)
257 		 * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
258 		 * yes          | no     | GUARDED4        | GUARDED4
259 		 * yes          | yes    | GUARDED4        | GUARDED4
260 		 */
261 
262 		/*
263 		 * Note: create modes (UNCHECKED,GUARDED...) are the same
264 		 * in NFSv4 as in v3 except EXCLUSIVE4_1.
265 		 */
266 		status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
267 					open->op_fname.len, &open->op_iattr,
268 					*resfh, open->op_createmode,
269 					(u32 *)open->op_verf.data,
270 					&open->op_truncate, &open->op_created);
271 
272 		if (!status && open->op_label.len)
273 			nfsd4_security_inode_setsecctx(*resfh, &open->op_label, open->op_bmval);
274 
275 		/*
276 		 * Following rfc 3530 14.2.16, use the returned bitmask
277 		 * to indicate which attributes we used to store the
278 		 * verifier:
279 		 */
280 		if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
281 			open->op_bmval[1] = (FATTR4_WORD1_TIME_ACCESS |
282 							FATTR4_WORD1_TIME_MODIFY);
283 	} else
284 		/*
285 		 * Note this may exit with the parent still locked.
286 		 * We will hold the lock until nfsd4_open's final
287 		 * lookup, to prevent renames or unlinks until we've had
288 		 * a chance to an acquire a delegation if appropriate.
289 		 */
290 		status = nfsd_lookup(rqstp, current_fh,
291 				     open->op_fname.data, open->op_fname.len, *resfh);
292 	if (status)
293 		goto out;
294 	status = nfsd_check_obj_isreg(*resfh);
295 	if (status)
296 		goto out;
297 
298 	if (is_create_with_attrs(open) && open->op_acl != NULL)
299 		do_set_nfs4_acl(rqstp, *resfh, open->op_acl, open->op_bmval);
300 
301 	nfsd4_set_open_owner_reply_cache(cstate, open, *resfh);
302 	accmode = NFSD_MAY_NOP;
303 	if (open->op_created ||
304 			open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
305 		accmode |= NFSD_MAY_OWNER_OVERRIDE;
306 	status = do_open_permission(rqstp, *resfh, open, accmode);
307 	set_change_info(&open->op_cinfo, current_fh);
308 out:
309 	return status;
310 }
311 
312 static __be32
313 do_open_fhandle(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
314 {
315 	struct svc_fh *current_fh = &cstate->current_fh;
316 	__be32 status;
317 	int accmode = 0;
318 
319 	/* We don't know the target directory, and therefore can not
320 	* set the change info
321 	*/
322 
323 	memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
324 
325 	nfsd4_set_open_owner_reply_cache(cstate, open, current_fh);
326 
327 	open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
328 		(open->op_iattr.ia_size == 0);
329 	/*
330 	 * In the delegation case, the client is telling us about an
331 	 * open that it *already* performed locally, some time ago.  We
332 	 * should let it succeed now if possible.
333 	 *
334 	 * In the case of a CLAIM_FH open, on the other hand, the client
335 	 * may be counting on us to enforce permissions (the Linux 4.1
336 	 * client uses this for normal opens, for example).
337 	 */
338 	if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
339 		accmode = NFSD_MAY_OWNER_OVERRIDE;
340 
341 	status = do_open_permission(rqstp, current_fh, open, accmode);
342 
343 	return status;
344 }
345 
346 static void
347 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
348 {
349 	struct nfsd4_sessionid *sid =
350 			(struct nfsd4_sessionid *)session->se_sessionid.data;
351 
352 	clid->cl_boot = sid->clientid.cl_boot;
353 	clid->cl_id = sid->clientid.cl_id;
354 }
355 
356 static __be32
357 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
358 	   struct nfsd4_open *open)
359 {
360 	__be32 status;
361 	struct svc_fh *resfh = NULL;
362 	struct nfsd4_compoundres *resp;
363 	struct net *net = SVC_NET(rqstp);
364 	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
365 
366 	dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
367 		(int)open->op_fname.len, open->op_fname.data,
368 		open->op_openowner);
369 
370 	/* This check required by spec. */
371 	if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
372 		return nfserr_inval;
373 
374 	open->op_created = 0;
375 	/*
376 	 * RFC5661 18.51.3
377 	 * Before RECLAIM_COMPLETE done, server should deny new lock
378 	 */
379 	if (nfsd4_has_session(cstate) &&
380 	    !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
381 		      &cstate->session->se_client->cl_flags) &&
382 	    open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
383 		return nfserr_grace;
384 
385 	if (nfsd4_has_session(cstate))
386 		copy_clientid(&open->op_clientid, cstate->session);
387 
388 	nfs4_lock_state();
389 
390 	/* check seqid for replay. set nfs4_owner */
391 	resp = rqstp->rq_resp;
392 	status = nfsd4_process_open1(&resp->cstate, open, nn);
393 	if (status == nfserr_replay_me) {
394 		struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
395 		fh_put(&cstate->current_fh);
396 		fh_copy_shallow(&cstate->current_fh.fh_handle,
397 				&rp->rp_openfh);
398 		status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
399 		if (status)
400 			dprintk("nfsd4_open: replay failed"
401 				" restoring previous filehandle\n");
402 		else
403 			status = nfserr_replay_me;
404 	}
405 	if (status)
406 		goto out;
407 	if (open->op_xdr_error) {
408 		status = open->op_xdr_error;
409 		goto out;
410 	}
411 
412 	status = nfsd4_check_open_attributes(rqstp, cstate, open);
413 	if (status)
414 		goto out;
415 
416 	/* Openowner is now set, so sequence id will get bumped.  Now we need
417 	 * these checks before we do any creates: */
418 	status = nfserr_grace;
419 	if (locks_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
420 		goto out;
421 	status = nfserr_no_grace;
422 	if (!locks_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
423 		goto out;
424 
425 	switch (open->op_claim_type) {
426 		case NFS4_OPEN_CLAIM_DELEGATE_CUR:
427 		case NFS4_OPEN_CLAIM_NULL:
428 			status = do_open_lookup(rqstp, cstate, open, &resfh);
429 			if (status)
430 				goto out;
431 			break;
432 		case NFS4_OPEN_CLAIM_PREVIOUS:
433 			open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
434 			status = nfs4_check_open_reclaim(&open->op_clientid,
435 							 cstate->minorversion,
436 							 nn);
437 			if (status)
438 				goto out;
439 		case NFS4_OPEN_CLAIM_FH:
440 		case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
441 			status = do_open_fhandle(rqstp, cstate, open);
442 			if (status)
443 				goto out;
444 			resfh = &cstate->current_fh;
445 			break;
446 		case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
447              	case NFS4_OPEN_CLAIM_DELEGATE_PREV:
448 			open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
449 			dprintk("NFSD: unsupported OPEN claim type %d\n",
450 				open->op_claim_type);
451 			status = nfserr_notsupp;
452 			goto out;
453 		default:
454 			dprintk("NFSD: Invalid OPEN claim type %d\n",
455 				open->op_claim_type);
456 			status = nfserr_inval;
457 			goto out;
458 	}
459 	/*
460 	 * nfsd4_process_open2() does the actual opening of the file.  If
461 	 * successful, it (1) truncates the file if open->op_truncate was
462 	 * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
463 	 */
464 	status = nfsd4_process_open2(rqstp, resfh, open);
465 	WARN_ON(status && open->op_created);
466 out:
467 	if (resfh && resfh != &cstate->current_fh) {
468 		fh_dup2(&cstate->current_fh, resfh);
469 		fh_put(resfh);
470 		kfree(resfh);
471 	}
472 	nfsd4_cleanup_open_state(open, status);
473 	if (open->op_openowner && !nfsd4_has_session(cstate))
474 		cstate->replay_owner = &open->op_openowner->oo_owner;
475 	nfsd4_bump_seqid(cstate, status);
476 	if (!cstate->replay_owner)
477 		nfs4_unlock_state();
478 	return status;
479 }
480 
481 /*
482  * OPEN is the only seqid-mutating operation whose decoding can fail
483  * with a seqid-mutating error (specifically, decoding of user names in
484  * the attributes).  Therefore we have to do some processing to look up
485  * the stateowner so that we can bump the seqid.
486  */
487 static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
488 {
489 	struct nfsd4_open *open = (struct nfsd4_open *)&op->u;
490 
491 	if (!seqid_mutating_err(ntohl(op->status)))
492 		return op->status;
493 	if (nfsd4_has_session(cstate))
494 		return op->status;
495 	open->op_xdr_error = op->status;
496 	return nfsd4_open(rqstp, cstate, open);
497 }
498 
499 /*
500  * filehandle-manipulating ops.
501  */
502 static __be32
503 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
504 	    struct svc_fh **getfh)
505 {
506 	if (!cstate->current_fh.fh_dentry)
507 		return nfserr_nofilehandle;
508 
509 	*getfh = &cstate->current_fh;
510 	return nfs_ok;
511 }
512 
513 static __be32
514 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
515 	    struct nfsd4_putfh *putfh)
516 {
517 	fh_put(&cstate->current_fh);
518 	cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
519 	memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
520 	       putfh->pf_fhlen);
521 	return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
522 }
523 
524 static __be32
525 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
526 		void *arg)
527 {
528 	__be32 status;
529 
530 	fh_put(&cstate->current_fh);
531 	status = exp_pseudoroot(rqstp, &cstate->current_fh);
532 	return status;
533 }
534 
535 static __be32
536 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
537 		void *arg)
538 {
539 	if (!cstate->save_fh.fh_dentry)
540 		return nfserr_restorefh;
541 
542 	fh_dup2(&cstate->current_fh, &cstate->save_fh);
543 	if (HAS_STATE_ID(cstate, SAVED_STATE_ID_FLAG)) {
544 		memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
545 		SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
546 	}
547 	return nfs_ok;
548 }
549 
550 static __be32
551 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
552 	     void *arg)
553 {
554 	if (!cstate->current_fh.fh_dentry)
555 		return nfserr_nofilehandle;
556 
557 	fh_dup2(&cstate->save_fh, &cstate->current_fh);
558 	if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
559 		memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
560 		SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG);
561 	}
562 	return nfs_ok;
563 }
564 
565 /*
566  * misc nfsv4 ops
567  */
568 static __be32
569 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
570 	     struct nfsd4_access *access)
571 {
572 	if (access->ac_req_access & ~NFS3_ACCESS_FULL)
573 		return nfserr_inval;
574 
575 	access->ac_resp_access = access->ac_req_access;
576 	return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
577 			   &access->ac_supported);
578 }
579 
580 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
581 {
582 	__be32 verf[2];
583 	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
584 
585 	verf[0] = (__be32)nn->nfssvc_boot.tv_sec;
586 	verf[1] = (__be32)nn->nfssvc_boot.tv_usec;
587 	memcpy(verifier->data, verf, sizeof(verifier->data));
588 }
589 
590 static __be32
591 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
592 	     struct nfsd4_commit *commit)
593 {
594 	gen_boot_verifier(&commit->co_verf, SVC_NET(rqstp));
595 	return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
596 			     commit->co_count);
597 }
598 
599 static __be32
600 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
601 	     struct nfsd4_create *create)
602 {
603 	struct svc_fh resfh;
604 	__be32 status;
605 	dev_t rdev;
606 
607 	fh_init(&resfh, NFS4_FHSIZE);
608 
609 	status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
610 			   NFSD_MAY_CREATE);
611 	if (status)
612 		return status;
613 
614 	status = check_attr_support(rqstp, cstate, create->cr_bmval,
615 				    nfsd_attrmask);
616 	if (status)
617 		return status;
618 
619 	switch (create->cr_type) {
620 	case NF4LNK:
621 		/* ugh! we have to null-terminate the linktext, or
622 		 * vfs_symlink() will choke.  it is always safe to
623 		 * null-terminate by brute force, since at worst we
624 		 * will overwrite the first byte of the create namelen
625 		 * in the XDR buffer, which has already been extracted
626 		 * during XDR decode.
627 		 */
628 		create->cr_linkname[create->cr_linklen] = 0;
629 
630 		status = nfsd_symlink(rqstp, &cstate->current_fh,
631 				      create->cr_name, create->cr_namelen,
632 				      create->cr_linkname, create->cr_linklen,
633 				      &resfh, &create->cr_iattr);
634 		break;
635 
636 	case NF4BLK:
637 		rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
638 		if (MAJOR(rdev) != create->cr_specdata1 ||
639 		    MINOR(rdev) != create->cr_specdata2)
640 			return nfserr_inval;
641 		status = nfsd_create(rqstp, &cstate->current_fh,
642 				     create->cr_name, create->cr_namelen,
643 				     &create->cr_iattr, S_IFBLK, rdev, &resfh);
644 		break;
645 
646 	case NF4CHR:
647 		rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
648 		if (MAJOR(rdev) != create->cr_specdata1 ||
649 		    MINOR(rdev) != create->cr_specdata2)
650 			return nfserr_inval;
651 		status = nfsd_create(rqstp, &cstate->current_fh,
652 				     create->cr_name, create->cr_namelen,
653 				     &create->cr_iattr,S_IFCHR, rdev, &resfh);
654 		break;
655 
656 	case NF4SOCK:
657 		status = nfsd_create(rqstp, &cstate->current_fh,
658 				     create->cr_name, create->cr_namelen,
659 				     &create->cr_iattr, S_IFSOCK, 0, &resfh);
660 		break;
661 
662 	case NF4FIFO:
663 		status = nfsd_create(rqstp, &cstate->current_fh,
664 				     create->cr_name, create->cr_namelen,
665 				     &create->cr_iattr, S_IFIFO, 0, &resfh);
666 		break;
667 
668 	case NF4DIR:
669 		create->cr_iattr.ia_valid &= ~ATTR_SIZE;
670 		status = nfsd_create(rqstp, &cstate->current_fh,
671 				     create->cr_name, create->cr_namelen,
672 				     &create->cr_iattr, S_IFDIR, 0, &resfh);
673 		break;
674 
675 	default:
676 		status = nfserr_badtype;
677 	}
678 
679 	if (status)
680 		goto out;
681 
682 	if (create->cr_label.len)
683 		nfsd4_security_inode_setsecctx(&resfh, &create->cr_label, create->cr_bmval);
684 
685 	if (create->cr_acl != NULL)
686 		do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
687 				create->cr_bmval);
688 
689 	fh_unlock(&cstate->current_fh);
690 	set_change_info(&create->cr_cinfo, &cstate->current_fh);
691 	fh_dup2(&cstate->current_fh, &resfh);
692 out:
693 	fh_put(&resfh);
694 	return status;
695 }
696 
697 static __be32
698 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
699 	      struct nfsd4_getattr *getattr)
700 {
701 	__be32 status;
702 
703 	status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
704 	if (status)
705 		return status;
706 
707 	if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
708 		return nfserr_inval;
709 
710 	getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
711 	getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
712 	getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
713 
714 	getattr->ga_fhp = &cstate->current_fh;
715 	return nfs_ok;
716 }
717 
718 static __be32
719 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
720 	   struct nfsd4_link *link)
721 {
722 	__be32 status = nfserr_nofilehandle;
723 
724 	if (!cstate->save_fh.fh_dentry)
725 		return status;
726 	status = nfsd_link(rqstp, &cstate->current_fh,
727 			   link->li_name, link->li_namelen, &cstate->save_fh);
728 	if (!status)
729 		set_change_info(&link->li_cinfo, &cstate->current_fh);
730 	return status;
731 }
732 
733 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
734 {
735 	struct svc_fh tmp_fh;
736 	__be32 ret;
737 
738 	fh_init(&tmp_fh, NFS4_FHSIZE);
739 	ret = exp_pseudoroot(rqstp, &tmp_fh);
740 	if (ret)
741 		return ret;
742 	if (tmp_fh.fh_dentry == fh->fh_dentry) {
743 		fh_put(&tmp_fh);
744 		return nfserr_noent;
745 	}
746 	fh_put(&tmp_fh);
747 	return nfsd_lookup(rqstp, fh, "..", 2, fh);
748 }
749 
750 static __be32
751 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
752 	      void *arg)
753 {
754 	return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
755 }
756 
757 static __be32
758 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
759 	     struct nfsd4_lookup *lookup)
760 {
761 	return nfsd_lookup(rqstp, &cstate->current_fh,
762 			   lookup->lo_name, lookup->lo_len,
763 			   &cstate->current_fh);
764 }
765 
766 static __be32
767 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
768 	   struct nfsd4_read *read)
769 {
770 	__be32 status;
771 
772 	/* no need to check permission - this will be done in nfsd_read() */
773 
774 	read->rd_filp = NULL;
775 	if (read->rd_offset >= OFFSET_MAX)
776 		return nfserr_inval;
777 
778 	/*
779 	 * If we do a zero copy read, then a client will see read data
780 	 * that reflects the state of the file *after* performing the
781 	 * following compound.
782 	 *
783 	 * To ensure proper ordering, we therefore turn off zero copy if
784 	 * the client wants us to do more in this compound:
785 	 */
786 	if (!nfsd4_last_compound_op(rqstp))
787 		rqstp->rq_splice_ok = false;
788 
789 	nfs4_lock_state();
790 	/* check stateid */
791 	if ((status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
792 						 cstate, &read->rd_stateid,
793 						 RD_STATE, &read->rd_filp))) {
794 		dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
795 		goto out;
796 	}
797 	if (read->rd_filp)
798 		get_file(read->rd_filp);
799 	status = nfs_ok;
800 out:
801 	nfs4_unlock_state();
802 	read->rd_rqstp = rqstp;
803 	read->rd_fhp = &cstate->current_fh;
804 	return status;
805 }
806 
807 static __be32
808 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
809 	      struct nfsd4_readdir *readdir)
810 {
811 	u64 cookie = readdir->rd_cookie;
812 	static const nfs4_verifier zeroverf;
813 
814 	/* no need to check permission - this will be done in nfsd_readdir() */
815 
816 	if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
817 		return nfserr_inval;
818 
819 	readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
820 	readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
821 	readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
822 
823 	if ((cookie == 1) || (cookie == 2) ||
824 	    (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
825 		return nfserr_bad_cookie;
826 
827 	readdir->rd_rqstp = rqstp;
828 	readdir->rd_fhp = &cstate->current_fh;
829 	return nfs_ok;
830 }
831 
832 static __be32
833 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
834 	       struct nfsd4_readlink *readlink)
835 {
836 	readlink->rl_rqstp = rqstp;
837 	readlink->rl_fhp = &cstate->current_fh;
838 	return nfs_ok;
839 }
840 
841 static __be32
842 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
843 	     struct nfsd4_remove *remove)
844 {
845 	__be32 status;
846 
847 	if (locks_in_grace(SVC_NET(rqstp)))
848 		return nfserr_grace;
849 	status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
850 			     remove->rm_name, remove->rm_namelen);
851 	if (!status) {
852 		fh_unlock(&cstate->current_fh);
853 		set_change_info(&remove->rm_cinfo, &cstate->current_fh);
854 	}
855 	return status;
856 }
857 
858 static __be32
859 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
860 	     struct nfsd4_rename *rename)
861 {
862 	__be32 status = nfserr_nofilehandle;
863 
864 	if (!cstate->save_fh.fh_dentry)
865 		return status;
866 	if (locks_in_grace(SVC_NET(rqstp)) &&
867 		!(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
868 		return nfserr_grace;
869 	status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
870 			     rename->rn_snamelen, &cstate->current_fh,
871 			     rename->rn_tname, rename->rn_tnamelen);
872 	if (status)
873 		return status;
874 	set_change_info(&rename->rn_sinfo, &cstate->current_fh);
875 	set_change_info(&rename->rn_tinfo, &cstate->save_fh);
876 	return nfs_ok;
877 }
878 
879 static __be32
880 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
881 	      struct nfsd4_secinfo *secinfo)
882 {
883 	struct svc_fh resfh;
884 	struct svc_export *exp;
885 	struct dentry *dentry;
886 	__be32 err;
887 
888 	fh_init(&resfh, NFS4_FHSIZE);
889 	err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
890 	if (err)
891 		return err;
892 	err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
893 				    secinfo->si_name, secinfo->si_namelen,
894 				    &exp, &dentry);
895 	if (err)
896 		return err;
897 	if (dentry->d_inode == NULL) {
898 		exp_put(exp);
899 		err = nfserr_noent;
900 	} else
901 		secinfo->si_exp = exp;
902 	dput(dentry);
903 	if (cstate->minorversion)
904 		/* See rfc 5661 section 2.6.3.1.1.8 */
905 		fh_put(&cstate->current_fh);
906 	return err;
907 }
908 
909 static __be32
910 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
911 	      struct nfsd4_secinfo_no_name *sin)
912 {
913 	__be32 err;
914 
915 	switch (sin->sin_style) {
916 	case NFS4_SECINFO_STYLE4_CURRENT_FH:
917 		break;
918 	case NFS4_SECINFO_STYLE4_PARENT:
919 		err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
920 		if (err)
921 			return err;
922 		break;
923 	default:
924 		return nfserr_inval;
925 	}
926 	exp_get(cstate->current_fh.fh_export);
927 	sin->sin_exp = cstate->current_fh.fh_export;
928 	fh_put(&cstate->current_fh);
929 	return nfs_ok;
930 }
931 
932 static __be32
933 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
934 	      struct nfsd4_setattr *setattr)
935 {
936 	__be32 status = nfs_ok;
937 	int err;
938 
939 	if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
940 		nfs4_lock_state();
941 		status = nfs4_preprocess_stateid_op(SVC_NET(rqstp), cstate,
942 			&setattr->sa_stateid, WR_STATE, NULL);
943 		nfs4_unlock_state();
944 		if (status) {
945 			dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
946 			return status;
947 		}
948 	}
949 	err = fh_want_write(&cstate->current_fh);
950 	if (err)
951 		return nfserrno(err);
952 	status = nfs_ok;
953 
954 	status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
955 				    nfsd_attrmask);
956 	if (status)
957 		goto out;
958 
959 	if (setattr->sa_acl != NULL)
960 		status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
961 					    setattr->sa_acl);
962 	if (status)
963 		goto out;
964 	if (setattr->sa_label.len)
965 		status = nfsd4_set_nfs4_label(rqstp, &cstate->current_fh,
966 				&setattr->sa_label);
967 	if (status)
968 		goto out;
969 	status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
970 				0, (time_t)0);
971 out:
972 	fh_drop_write(&cstate->current_fh);
973 	return status;
974 }
975 
976 static int fill_in_write_vector(struct kvec *vec, struct nfsd4_write *write)
977 {
978         int i = 1;
979         int buflen = write->wr_buflen;
980 
981         vec[0].iov_base = write->wr_head.iov_base;
982         vec[0].iov_len = min_t(int, buflen, write->wr_head.iov_len);
983         buflen -= vec[0].iov_len;
984 
985         while (buflen) {
986                 vec[i].iov_base = page_address(write->wr_pagelist[i - 1]);
987                 vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
988                 buflen -= vec[i].iov_len;
989                 i++;
990         }
991         return i;
992 }
993 
994 static __be32
995 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
996 	    struct nfsd4_write *write)
997 {
998 	stateid_t *stateid = &write->wr_stateid;
999 	struct file *filp = NULL;
1000 	__be32 status = nfs_ok;
1001 	unsigned long cnt;
1002 	int nvecs;
1003 
1004 	/* no need to check permission - this will be done in nfsd_write() */
1005 
1006 	if (write->wr_offset >= OFFSET_MAX)
1007 		return nfserr_inval;
1008 
1009 	nfs4_lock_state();
1010 	status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
1011 					cstate, stateid, WR_STATE, &filp);
1012 	if (status) {
1013 		nfs4_unlock_state();
1014 		dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
1015 		return status;
1016 	}
1017 	if (filp)
1018 		get_file(filp);
1019 	nfs4_unlock_state();
1020 
1021 	cnt = write->wr_buflen;
1022 	write->wr_how_written = write->wr_stable_how;
1023 	gen_boot_verifier(&write->wr_verifier, SVC_NET(rqstp));
1024 
1025 	nvecs = fill_in_write_vector(rqstp->rq_vec, write);
1026 	WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1027 
1028 	status =  nfsd_write(rqstp, &cstate->current_fh, filp,
1029 			     write->wr_offset, rqstp->rq_vec, nvecs,
1030 			     &cnt, &write->wr_how_written);
1031 	if (filp)
1032 		fput(filp);
1033 
1034 	write->wr_bytes_written = cnt;
1035 
1036 	return status;
1037 }
1038 
1039 /* This routine never returns NFS_OK!  If there are no other errors, it
1040  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
1041  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
1042  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
1043  */
1044 static __be32
1045 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1046 	     struct nfsd4_verify *verify)
1047 {
1048 	__be32 *buf, *p;
1049 	int count;
1050 	__be32 status;
1051 
1052 	status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
1053 	if (status)
1054 		return status;
1055 
1056 	status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
1057 	if (status)
1058 		return status;
1059 
1060 	if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1061 	    || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1062 		return nfserr_inval;
1063 	if (verify->ve_attrlen & 3)
1064 		return nfserr_inval;
1065 
1066 	/* count in words:
1067 	 *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1068 	 */
1069 	count = 4 + (verify->ve_attrlen >> 2);
1070 	buf = kmalloc(count << 2, GFP_KERNEL);
1071 	if (!buf)
1072 		return nfserr_jukebox;
1073 
1074 	p = buf;
1075 	status = nfsd4_encode_fattr(&cstate->current_fh,
1076 				    cstate->current_fh.fh_export,
1077 				    cstate->current_fh.fh_dentry, &p,
1078 				    count, verify->ve_bmval,
1079 				    rqstp, 0);
1080 	/*
1081 	 * If nfsd4_encode_fattr() ran out of space, assume that's because
1082 	 * the attributes are longer (hence different) than those given:
1083 	 */
1084 	if (status == nfserr_resource)
1085 		status = nfserr_not_same;
1086 	if (status)
1087 		goto out_kfree;
1088 
1089 	/* skip bitmap */
1090 	p = buf + 1 + ntohl(buf[0]);
1091 	status = nfserr_not_same;
1092 	if (ntohl(*p++) != verify->ve_attrlen)
1093 		goto out_kfree;
1094 	if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1095 		status = nfserr_same;
1096 
1097 out_kfree:
1098 	kfree(buf);
1099 	return status;
1100 }
1101 
1102 static __be32
1103 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1104 	      struct nfsd4_verify *verify)
1105 {
1106 	__be32 status;
1107 
1108 	status = _nfsd4_verify(rqstp, cstate, verify);
1109 	return status == nfserr_not_same ? nfs_ok : status;
1110 }
1111 
1112 static __be32
1113 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1114 	     struct nfsd4_verify *verify)
1115 {
1116 	__be32 status;
1117 
1118 	status = _nfsd4_verify(rqstp, cstate, verify);
1119 	return status == nfserr_same ? nfs_ok : status;
1120 }
1121 
1122 /*
1123  * NULL call.
1124  */
1125 static __be32
1126 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
1127 {
1128 	return nfs_ok;
1129 }
1130 
1131 static inline void nfsd4_increment_op_stats(u32 opnum)
1132 {
1133 	if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1134 		nfsdstats.nfs4_opcount[opnum]++;
1135 }
1136 
1137 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1138 			      void *);
1139 typedef u32(*nfsd4op_rsize)(struct svc_rqst *, struct nfsd4_op *op);
1140 typedef void(*stateid_setter)(struct nfsd4_compound_state *, void *);
1141 typedef void(*stateid_getter)(struct nfsd4_compound_state *, void *);
1142 
1143 enum nfsd4_op_flags {
1144 	ALLOWED_WITHOUT_FH = 1 << 0,	/* No current filehandle required */
1145 	ALLOWED_ON_ABSENT_FS = 1 << 1,	/* ops processed on absent fs */
1146 	ALLOWED_AS_FIRST_OP = 1 << 2,	/* ops reqired first in compound */
1147 	/* For rfc 5661 section 2.6.3.1.1: */
1148 	OP_HANDLES_WRONGSEC = 1 << 3,
1149 	OP_IS_PUTFH_LIKE = 1 << 4,
1150 	/*
1151 	 * These are the ops whose result size we estimate before
1152 	 * encoding, to avoid performing an op then not being able to
1153 	 * respond or cache a response.  This includes writes and setattrs
1154 	 * as well as the operations usually called "nonidempotent":
1155 	 */
1156 	OP_MODIFIES_SOMETHING = 1 << 5,
1157 	/*
1158 	 * Cache compounds containing these ops in the xid-based drc:
1159 	 * We use the DRC for compounds containing non-idempotent
1160 	 * operations, *except* those that are 4.1-specific (since
1161 	 * sessions provide their own EOS), and except for stateful
1162 	 * operations other than setclientid and setclientid_confirm
1163 	 * (since sequence numbers provide EOS for open, lock, etc in
1164 	 * the v4.0 case).
1165 	 */
1166 	OP_CACHEME = 1 << 6,
1167 	/*
1168 	 * These are ops which clear current state id.
1169 	 */
1170 	OP_CLEAR_STATEID = 1 << 7,
1171 };
1172 
1173 struct nfsd4_operation {
1174 	nfsd4op_func op_func;
1175 	u32 op_flags;
1176 	char *op_name;
1177 	/* Try to get response size before operation */
1178 	nfsd4op_rsize op_rsize_bop;
1179 	stateid_getter op_get_currentstateid;
1180 	stateid_setter op_set_currentstateid;
1181 };
1182 
1183 static struct nfsd4_operation nfsd4_ops[];
1184 
1185 #ifdef NFSD_DEBUG
1186 static const char *nfsd4_op_name(unsigned opnum);
1187 #endif
1188 
1189 /*
1190  * Enforce NFSv4.1 COMPOUND ordering rules:
1191  *
1192  * Also note, enforced elsewhere:
1193  *	- SEQUENCE other than as first op results in
1194  *	  NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1195  *	- BIND_CONN_TO_SESSION must be the only op in its compound.
1196  *	  (Enforced in nfsd4_bind_conn_to_session().)
1197  *	- DESTROY_SESSION must be the final operation in a compound, if
1198  *	  sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1199  *	  (Enforced in nfsd4_destroy_session().)
1200  */
1201 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1202 {
1203 	struct nfsd4_op *op = &args->ops[0];
1204 
1205 	/* These ordering requirements don't apply to NFSv4.0: */
1206 	if (args->minorversion == 0)
1207 		return nfs_ok;
1208 	/* This is weird, but OK, not our problem: */
1209 	if (args->opcnt == 0)
1210 		return nfs_ok;
1211 	if (op->status == nfserr_op_illegal)
1212 		return nfs_ok;
1213 	if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1214 		return nfserr_op_not_in_session;
1215 	if (op->opnum == OP_SEQUENCE)
1216 		return nfs_ok;
1217 	if (args->opcnt != 1)
1218 		return nfserr_not_only_op;
1219 	return nfs_ok;
1220 }
1221 
1222 static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1223 {
1224 	return &nfsd4_ops[op->opnum];
1225 }
1226 
1227 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1228 {
1229 	return OPDESC(op)->op_flags & OP_CACHEME;
1230 }
1231 
1232 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1233 {
1234 	struct nfsd4_compoundres *resp = rqstp->rq_resp;
1235 	struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1236 	struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1237 	struct nfsd4_op *next = &argp->ops[resp->opcnt];
1238 	struct nfsd4_operation *thisd;
1239 	struct nfsd4_operation *nextd;
1240 
1241 	thisd = OPDESC(this);
1242 	/*
1243 	 * Most ops check wronsec on our own; only the putfh-like ops
1244 	 * have special rules.
1245 	 */
1246 	if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1247 		return false;
1248 	/*
1249 	 * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1250 	 * put-filehandle operation if we're not going to use the
1251 	 * result:
1252 	 */
1253 	if (argp->opcnt == resp->opcnt)
1254 		return false;
1255 
1256 	nextd = OPDESC(next);
1257 	/*
1258 	 * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1259 	 * errors themselves as necessary; others should check for them
1260 	 * now:
1261 	 */
1262 	return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1263 }
1264 
1265 /*
1266  * COMPOUND call.
1267  */
1268 static __be32
1269 nfsd4_proc_compound(struct svc_rqst *rqstp,
1270 		    struct nfsd4_compoundargs *args,
1271 		    struct nfsd4_compoundres *resp)
1272 {
1273 	struct nfsd4_op	*op;
1274 	struct nfsd4_operation *opdesc;
1275 	struct nfsd4_compound_state *cstate = &resp->cstate;
1276 	struct svc_fh *current_fh = &cstate->current_fh;
1277 	struct svc_fh *save_fh = &cstate->save_fh;
1278 	int		slack_bytes;
1279 	u32		plen = 0;
1280 	__be32		status;
1281 
1282 	resp->xbuf = &rqstp->rq_res;
1283 	resp->p = rqstp->rq_res.head[0].iov_base +
1284 						rqstp->rq_res.head[0].iov_len;
1285 	resp->tagp = resp->p;
1286 	/* reserve space for: taglen, tag, and opcnt */
1287 	resp->p += 2 + XDR_QUADLEN(args->taglen);
1288 	resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
1289 	resp->taglen = args->taglen;
1290 	resp->tag = args->tag;
1291 	resp->opcnt = 0;
1292 	resp->rqstp = rqstp;
1293 	cstate->minorversion = args->minorversion;
1294 	cstate->replay_owner = NULL;
1295 	cstate->session = NULL;
1296 	fh_init(current_fh, NFS4_FHSIZE);
1297 	fh_init(save_fh, NFS4_FHSIZE);
1298 	/*
1299 	 * Don't use the deferral mechanism for NFSv4; compounds make it
1300 	 * too hard to avoid non-idempotency problems.
1301 	 */
1302 	rqstp->rq_usedeferral = 0;
1303 
1304 	/*
1305 	 * According to RFC3010, this takes precedence over all other errors.
1306 	 */
1307 	status = nfserr_minor_vers_mismatch;
1308 	if (nfsd_minorversion(args->minorversion, NFSD_TEST) <= 0)
1309 		goto out;
1310 
1311 	status = nfs41_check_op_ordering(args);
1312 	if (status) {
1313 		op = &args->ops[0];
1314 		op->status = status;
1315 		goto encode_op;
1316 	}
1317 
1318 	while (!status && resp->opcnt < args->opcnt) {
1319 		op = &args->ops[resp->opcnt++];
1320 
1321 		dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1322 			resp->opcnt, args->opcnt, op->opnum,
1323 			nfsd4_op_name(op->opnum));
1324 		/*
1325 		 * The XDR decode routines may have pre-set op->status;
1326 		 * for example, if there is a miscellaneous XDR error
1327 		 * it will be set to nfserr_bad_xdr.
1328 		 */
1329 		if (op->status) {
1330 			if (op->opnum == OP_OPEN)
1331 				op->status = nfsd4_open_omfg(rqstp, cstate, op);
1332 			goto encode_op;
1333 		}
1334 
1335 		/* We must be able to encode a successful response to
1336 		 * this operation, with enough room left over to encode a
1337 		 * failed response to the next operation.  If we don't
1338 		 * have enough room, fail with ERR_RESOURCE.
1339 		 */
1340 		slack_bytes = (char *)resp->end - (char *)resp->p;
1341 		if (slack_bytes < COMPOUND_SLACK_SPACE
1342 				+ COMPOUND_ERR_SLACK_SPACE) {
1343 			BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
1344 			op->status = nfserr_resource;
1345 			goto encode_op;
1346 		}
1347 
1348 		opdesc = OPDESC(op);
1349 
1350 		if (!current_fh->fh_dentry) {
1351 			if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1352 				op->status = nfserr_nofilehandle;
1353 				goto encode_op;
1354 			}
1355 		} else if (current_fh->fh_export->ex_fslocs.migrated &&
1356 			  !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1357 			op->status = nfserr_moved;
1358 			goto encode_op;
1359 		}
1360 
1361 		fh_clear_wcc(current_fh);
1362 
1363 		/* If op is non-idempotent */
1364 		if (opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1365 			plen = opdesc->op_rsize_bop(rqstp, op);
1366 			/*
1367 			 * If there's still another operation, make sure
1368 			 * we'll have space to at least encode an error:
1369 			 */
1370 			if (resp->opcnt < args->opcnt)
1371 				plen += COMPOUND_ERR_SLACK_SPACE;
1372 			op->status = nfsd4_check_resp_size(resp, plen);
1373 		}
1374 
1375 		if (op->status)
1376 			goto encode_op;
1377 
1378 		if (opdesc->op_get_currentstateid)
1379 			opdesc->op_get_currentstateid(cstate, &op->u);
1380 		op->status = opdesc->op_func(rqstp, cstate, &op->u);
1381 
1382 		if (!op->status) {
1383 			if (opdesc->op_set_currentstateid)
1384 				opdesc->op_set_currentstateid(cstate, &op->u);
1385 
1386 			if (opdesc->op_flags & OP_CLEAR_STATEID)
1387 				clear_current_stateid(cstate);
1388 
1389 			if (need_wrongsec_check(rqstp))
1390 				op->status = check_nfsd_access(current_fh->fh_export, rqstp);
1391 		}
1392 
1393 encode_op:
1394 		/* Only from SEQUENCE */
1395 		if (cstate->status == nfserr_replay_cache) {
1396 			dprintk("%s NFS4.1 replay from cache\n", __func__);
1397 			status = op->status;
1398 			goto out;
1399 		}
1400 		if (op->status == nfserr_replay_me) {
1401 			op->replay = &cstate->replay_owner->so_replay;
1402 			nfsd4_encode_replay(resp, op);
1403 			status = op->status = op->replay->rp_status;
1404 		} else {
1405 			nfsd4_encode_operation(resp, op);
1406 			status = op->status;
1407 		}
1408 
1409 		dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1410 			args->ops, args->opcnt, resp->opcnt, op->opnum,
1411 			be32_to_cpu(status));
1412 
1413 		if (cstate->replay_owner) {
1414 			nfs4_unlock_state();
1415 			cstate->replay_owner = NULL;
1416 		}
1417 		/* XXX Ugh, we need to get rid of this kind of special case: */
1418 		if (op->opnum == OP_READ && op->u.read.rd_filp)
1419 			fput(op->u.read.rd_filp);
1420 
1421 		nfsd4_increment_op_stats(op->opnum);
1422 	}
1423 
1424 	cstate->status = status;
1425 	fh_put(current_fh);
1426 	fh_put(save_fh);
1427 	BUG_ON(cstate->replay_owner);
1428 out:
1429 	/* Reset deferral mechanism for RPC deferrals */
1430 	rqstp->rq_usedeferral = 1;
1431 	dprintk("nfsv4 compound returned %d\n", ntohl(status));
1432 	return status;
1433 }
1434 
1435 #define op_encode_hdr_size		(2)
1436 #define op_encode_stateid_maxsz		(XDR_QUADLEN(NFS4_STATEID_SIZE))
1437 #define op_encode_verifier_maxsz	(XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1438 #define op_encode_change_info_maxsz	(5)
1439 #define nfs4_fattr_bitmap_maxsz		(4)
1440 
1441 #define op_encode_lockowner_maxsz	(1 + XDR_QUADLEN(IDMAP_NAMESZ))
1442 #define op_encode_lock_denied_maxsz	(8 + op_encode_lockowner_maxsz)
1443 
1444 #define nfs4_owner_maxsz		(1 + XDR_QUADLEN(IDMAP_NAMESZ))
1445 
1446 #define op_encode_ace_maxsz		(3 + nfs4_owner_maxsz)
1447 #define op_encode_delegation_maxsz	(1 + op_encode_stateid_maxsz + 1 + \
1448 					 op_encode_ace_maxsz)
1449 
1450 #define op_encode_channel_attrs_maxsz	(6 + 1 + 1)
1451 
1452 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1453 {
1454 	return (op_encode_hdr_size) * sizeof(__be32);
1455 }
1456 
1457 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1458 {
1459 	return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1460 }
1461 
1462 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1463 {
1464 	return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1465 }
1466 
1467 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1468 {
1469 	return (op_encode_hdr_size + op_encode_change_info_maxsz
1470 		+ nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1471 }
1472 
1473 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1474 {
1475 	return (op_encode_hdr_size + op_encode_change_info_maxsz)
1476 		* sizeof(__be32);
1477 }
1478 
1479 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1480 {
1481 	return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1482 		* sizeof(__be32);
1483 }
1484 
1485 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1486 {
1487 	return (op_encode_hdr_size + op_encode_stateid_maxsz
1488 		+ op_encode_change_info_maxsz + 1
1489 		+ nfs4_fattr_bitmap_maxsz
1490 		+ op_encode_delegation_maxsz) * sizeof(__be32);
1491 }
1492 
1493 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1494 {
1495 	u32 maxcount = 0, rlen = 0;
1496 
1497 	maxcount = svc_max_payload(rqstp);
1498 	rlen = op->u.read.rd_length;
1499 
1500 	if (rlen > maxcount)
1501 		rlen = maxcount;
1502 
1503 	return (op_encode_hdr_size + 2) * sizeof(__be32) + rlen;
1504 }
1505 
1506 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1507 {
1508 	u32 rlen = op->u.readdir.rd_maxcount;
1509 
1510 	if (rlen > PAGE_SIZE)
1511 		rlen = PAGE_SIZE;
1512 
1513 	return (op_encode_hdr_size + op_encode_verifier_maxsz)
1514 		 * sizeof(__be32) + rlen;
1515 }
1516 
1517 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1518 {
1519 	return (op_encode_hdr_size + op_encode_change_info_maxsz)
1520 		* sizeof(__be32);
1521 }
1522 
1523 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1524 {
1525 	return (op_encode_hdr_size + op_encode_change_info_maxsz
1526 		+ op_encode_change_info_maxsz) * sizeof(__be32);
1527 }
1528 
1529 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1530 {
1531 	return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1532 }
1533 
1534 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1535 {
1536 	return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
1537 								sizeof(__be32);
1538 }
1539 
1540 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1541 {
1542 	return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1543 }
1544 
1545 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1546 {
1547 	return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
1548 		1 + 1 + /* eir_flags, spr_how */\
1549 		4 + /* spo_must_enforce & _allow with bitmap */\
1550 		2 + /*eir_server_owner.so_minor_id */\
1551 		/* eir_server_owner.so_major_id<> */\
1552 		XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1553 		/* eir_server_scope<> */\
1554 		XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1555 		1 + /* eir_server_impl_id array length */\
1556 		0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
1557 }
1558 
1559 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1560 {
1561 	return (op_encode_hdr_size + \
1562 		XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
1563 		2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
1564 }
1565 
1566 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1567 {
1568 	return (op_encode_hdr_size + \
1569 		XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
1570 		2 + /* csr_sequence, csr_flags */\
1571 		op_encode_channel_attrs_maxsz + \
1572 		op_encode_channel_attrs_maxsz) * sizeof(__be32);
1573 }
1574 
1575 static struct nfsd4_operation nfsd4_ops[] = {
1576 	[OP_ACCESS] = {
1577 		.op_func = (nfsd4op_func)nfsd4_access,
1578 		.op_name = "OP_ACCESS",
1579 	},
1580 	[OP_CLOSE] = {
1581 		.op_func = (nfsd4op_func)nfsd4_close,
1582 		.op_flags = OP_MODIFIES_SOMETHING,
1583 		.op_name = "OP_CLOSE",
1584 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1585 		.op_get_currentstateid = (stateid_getter)nfsd4_get_closestateid,
1586 		.op_set_currentstateid = (stateid_setter)nfsd4_set_closestateid,
1587 	},
1588 	[OP_COMMIT] = {
1589 		.op_func = (nfsd4op_func)nfsd4_commit,
1590 		.op_flags = OP_MODIFIES_SOMETHING,
1591 		.op_name = "OP_COMMIT",
1592 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_commit_rsize,
1593 	},
1594 	[OP_CREATE] = {
1595 		.op_func = (nfsd4op_func)nfsd4_create,
1596 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
1597 		.op_name = "OP_CREATE",
1598 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_create_rsize,
1599 	},
1600 	[OP_DELEGRETURN] = {
1601 		.op_func = (nfsd4op_func)nfsd4_delegreturn,
1602 		.op_flags = OP_MODIFIES_SOMETHING,
1603 		.op_name = "OP_DELEGRETURN",
1604 		.op_rsize_bop = nfsd4_only_status_rsize,
1605 		.op_get_currentstateid = (stateid_getter)nfsd4_get_delegreturnstateid,
1606 	},
1607 	[OP_GETATTR] = {
1608 		.op_func = (nfsd4op_func)nfsd4_getattr,
1609 		.op_flags = ALLOWED_ON_ABSENT_FS,
1610 		.op_name = "OP_GETATTR",
1611 	},
1612 	[OP_GETFH] = {
1613 		.op_func = (nfsd4op_func)nfsd4_getfh,
1614 		.op_name = "OP_GETFH",
1615 	},
1616 	[OP_LINK] = {
1617 		.op_func = (nfsd4op_func)nfsd4_link,
1618 		.op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
1619 				| OP_CACHEME,
1620 		.op_name = "OP_LINK",
1621 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_link_rsize,
1622 	},
1623 	[OP_LOCK] = {
1624 		.op_func = (nfsd4op_func)nfsd4_lock,
1625 		.op_flags = OP_MODIFIES_SOMETHING,
1626 		.op_name = "OP_LOCK",
1627 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_lock_rsize,
1628 		.op_set_currentstateid = (stateid_setter)nfsd4_set_lockstateid,
1629 	},
1630 	[OP_LOCKT] = {
1631 		.op_func = (nfsd4op_func)nfsd4_lockt,
1632 		.op_name = "OP_LOCKT",
1633 	},
1634 	[OP_LOCKU] = {
1635 		.op_func = (nfsd4op_func)nfsd4_locku,
1636 		.op_flags = OP_MODIFIES_SOMETHING,
1637 		.op_name = "OP_LOCKU",
1638 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1639 		.op_get_currentstateid = (stateid_getter)nfsd4_get_lockustateid,
1640 	},
1641 	[OP_LOOKUP] = {
1642 		.op_func = (nfsd4op_func)nfsd4_lookup,
1643 		.op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1644 		.op_name = "OP_LOOKUP",
1645 	},
1646 	[OP_LOOKUPP] = {
1647 		.op_func = (nfsd4op_func)nfsd4_lookupp,
1648 		.op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1649 		.op_name = "OP_LOOKUPP",
1650 	},
1651 	[OP_NVERIFY] = {
1652 		.op_func = (nfsd4op_func)nfsd4_nverify,
1653 		.op_name = "OP_NVERIFY",
1654 	},
1655 	[OP_OPEN] = {
1656 		.op_func = (nfsd4op_func)nfsd4_open,
1657 		.op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1658 		.op_name = "OP_OPEN",
1659 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_open_rsize,
1660 		.op_set_currentstateid = (stateid_setter)nfsd4_set_openstateid,
1661 	},
1662 	[OP_OPEN_CONFIRM] = {
1663 		.op_func = (nfsd4op_func)nfsd4_open_confirm,
1664 		.op_flags = OP_MODIFIES_SOMETHING,
1665 		.op_name = "OP_OPEN_CONFIRM",
1666 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1667 	},
1668 	[OP_OPEN_DOWNGRADE] = {
1669 		.op_func = (nfsd4op_func)nfsd4_open_downgrade,
1670 		.op_flags = OP_MODIFIES_SOMETHING,
1671 		.op_name = "OP_OPEN_DOWNGRADE",
1672 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1673 		.op_get_currentstateid = (stateid_getter)nfsd4_get_opendowngradestateid,
1674 		.op_set_currentstateid = (stateid_setter)nfsd4_set_opendowngradestateid,
1675 	},
1676 	[OP_PUTFH] = {
1677 		.op_func = (nfsd4op_func)nfsd4_putfh,
1678 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1679 				| OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1680 				| OP_CLEAR_STATEID,
1681 		.op_name = "OP_PUTFH",
1682 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1683 	},
1684 	[OP_PUTPUBFH] = {
1685 		.op_func = (nfsd4op_func)nfsd4_putrootfh,
1686 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1687 				| OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1688 				| OP_CLEAR_STATEID,
1689 		.op_name = "OP_PUTPUBFH",
1690 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1691 	},
1692 	[OP_PUTROOTFH] = {
1693 		.op_func = (nfsd4op_func)nfsd4_putrootfh,
1694 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1695 				| OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1696 				| OP_CLEAR_STATEID,
1697 		.op_name = "OP_PUTROOTFH",
1698 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1699 	},
1700 	[OP_READ] = {
1701 		.op_func = (nfsd4op_func)nfsd4_read,
1702 		.op_flags = OP_MODIFIES_SOMETHING,
1703 		.op_name = "OP_READ",
1704 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_read_rsize,
1705 		.op_get_currentstateid = (stateid_getter)nfsd4_get_readstateid,
1706 	},
1707 	[OP_READDIR] = {
1708 		.op_func = (nfsd4op_func)nfsd4_readdir,
1709 		.op_flags = OP_MODIFIES_SOMETHING,
1710 		.op_name = "OP_READDIR",
1711 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_readdir_rsize,
1712 	},
1713 	[OP_READLINK] = {
1714 		.op_func = (nfsd4op_func)nfsd4_readlink,
1715 		.op_name = "OP_READLINK",
1716 	},
1717 	[OP_REMOVE] = {
1718 		.op_func = (nfsd4op_func)nfsd4_remove,
1719 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1720 		.op_name = "OP_REMOVE",
1721 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_remove_rsize,
1722 	},
1723 	[OP_RENAME] = {
1724 		.op_func = (nfsd4op_func)nfsd4_rename,
1725 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1726 		.op_name = "OP_RENAME",
1727 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_rename_rsize,
1728 	},
1729 	[OP_RENEW] = {
1730 		.op_func = (nfsd4op_func)nfsd4_renew,
1731 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1732 				| OP_MODIFIES_SOMETHING,
1733 		.op_name = "OP_RENEW",
1734 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1735 
1736 	},
1737 	[OP_RESTOREFH] = {
1738 		.op_func = (nfsd4op_func)nfsd4_restorefh,
1739 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1740 				| OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
1741 		.op_name = "OP_RESTOREFH",
1742 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1743 	},
1744 	[OP_SAVEFH] = {
1745 		.op_func = (nfsd4op_func)nfsd4_savefh,
1746 		.op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1747 		.op_name = "OP_SAVEFH",
1748 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1749 	},
1750 	[OP_SECINFO] = {
1751 		.op_func = (nfsd4op_func)nfsd4_secinfo,
1752 		.op_flags = OP_HANDLES_WRONGSEC,
1753 		.op_name = "OP_SECINFO",
1754 	},
1755 	[OP_SETATTR] = {
1756 		.op_func = (nfsd4op_func)nfsd4_setattr,
1757 		.op_name = "OP_SETATTR",
1758 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1759 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_setattr_rsize,
1760 		.op_get_currentstateid = (stateid_getter)nfsd4_get_setattrstateid,
1761 	},
1762 	[OP_SETCLIENTID] = {
1763 		.op_func = (nfsd4op_func)nfsd4_setclientid,
1764 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1765 				| OP_MODIFIES_SOMETHING | OP_CACHEME,
1766 		.op_name = "OP_SETCLIENTID",
1767 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_setclientid_rsize,
1768 	},
1769 	[OP_SETCLIENTID_CONFIRM] = {
1770 		.op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1771 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1772 				| OP_MODIFIES_SOMETHING | OP_CACHEME,
1773 		.op_name = "OP_SETCLIENTID_CONFIRM",
1774 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1775 	},
1776 	[OP_VERIFY] = {
1777 		.op_func = (nfsd4op_func)nfsd4_verify,
1778 		.op_name = "OP_VERIFY",
1779 	},
1780 	[OP_WRITE] = {
1781 		.op_func = (nfsd4op_func)nfsd4_write,
1782 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1783 		.op_name = "OP_WRITE",
1784 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
1785 		.op_get_currentstateid = (stateid_getter)nfsd4_get_writestateid,
1786 	},
1787 	[OP_RELEASE_LOCKOWNER] = {
1788 		.op_func = (nfsd4op_func)nfsd4_release_lockowner,
1789 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1790 				| OP_MODIFIES_SOMETHING,
1791 		.op_name = "OP_RELEASE_LOCKOWNER",
1792 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1793 	},
1794 
1795 	/* NFSv4.1 operations */
1796 	[OP_EXCHANGE_ID] = {
1797 		.op_func = (nfsd4op_func)nfsd4_exchange_id,
1798 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1799 				| OP_MODIFIES_SOMETHING,
1800 		.op_name = "OP_EXCHANGE_ID",
1801 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_exchange_id_rsize,
1802 	},
1803 	[OP_BACKCHANNEL_CTL] = {
1804 		.op_func = (nfsd4op_func)nfsd4_backchannel_ctl,
1805 		.op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1806 		.op_name = "OP_BACKCHANNEL_CTL",
1807 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1808 	},
1809 	[OP_BIND_CONN_TO_SESSION] = {
1810 		.op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
1811 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1812 				| OP_MODIFIES_SOMETHING,
1813 		.op_name = "OP_BIND_CONN_TO_SESSION",
1814 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_bind_conn_to_session_rsize,
1815 	},
1816 	[OP_CREATE_SESSION] = {
1817 		.op_func = (nfsd4op_func)nfsd4_create_session,
1818 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1819 				| OP_MODIFIES_SOMETHING,
1820 		.op_name = "OP_CREATE_SESSION",
1821 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_create_session_rsize,
1822 	},
1823 	[OP_DESTROY_SESSION] = {
1824 		.op_func = (nfsd4op_func)nfsd4_destroy_session,
1825 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1826 				| OP_MODIFIES_SOMETHING,
1827 		.op_name = "OP_DESTROY_SESSION",
1828 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1829 	},
1830 	[OP_SEQUENCE] = {
1831 		.op_func = (nfsd4op_func)nfsd4_sequence,
1832 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1833 		.op_name = "OP_SEQUENCE",
1834 	},
1835 	[OP_DESTROY_CLIENTID] = {
1836 		.op_func = (nfsd4op_func)nfsd4_destroy_clientid,
1837 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1838 				| OP_MODIFIES_SOMETHING,
1839 		.op_name = "OP_DESTROY_CLIENTID",
1840 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1841 	},
1842 	[OP_RECLAIM_COMPLETE] = {
1843 		.op_func = (nfsd4op_func)nfsd4_reclaim_complete,
1844 		.op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1845 		.op_name = "OP_RECLAIM_COMPLETE",
1846 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1847 	},
1848 	[OP_SECINFO_NO_NAME] = {
1849 		.op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
1850 		.op_flags = OP_HANDLES_WRONGSEC,
1851 		.op_name = "OP_SECINFO_NO_NAME",
1852 	},
1853 	[OP_TEST_STATEID] = {
1854 		.op_func = (nfsd4op_func)nfsd4_test_stateid,
1855 		.op_flags = ALLOWED_WITHOUT_FH,
1856 		.op_name = "OP_TEST_STATEID",
1857 	},
1858 	[OP_FREE_STATEID] = {
1859 		.op_func = (nfsd4op_func)nfsd4_free_stateid,
1860 		.op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1861 		.op_name = "OP_FREE_STATEID",
1862 		.op_get_currentstateid = (stateid_getter)nfsd4_get_freestateid,
1863 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1864 	},
1865 };
1866 
1867 #ifdef NFSD_DEBUG
1868 static const char *nfsd4_op_name(unsigned opnum)
1869 {
1870 	if (opnum < ARRAY_SIZE(nfsd4_ops))
1871 		return nfsd4_ops[opnum].op_name;
1872 	return "unknown_operation";
1873 }
1874 #endif
1875 
1876 #define nfsd4_voidres			nfsd4_voidargs
1877 struct nfsd4_voidargs { int dummy; };
1878 
1879 static struct svc_procedure		nfsd_procedures4[2] = {
1880 	[NFSPROC4_NULL] = {
1881 		.pc_func = (svc_procfunc) nfsd4_proc_null,
1882 		.pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1883 		.pc_argsize = sizeof(struct nfsd4_voidargs),
1884 		.pc_ressize = sizeof(struct nfsd4_voidres),
1885 		.pc_cachetype = RC_NOCACHE,
1886 		.pc_xdrressize = 1,
1887 	},
1888 	[NFSPROC4_COMPOUND] = {
1889 		.pc_func = (svc_procfunc) nfsd4_proc_compound,
1890 		.pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1891 		.pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1892 		.pc_argsize = sizeof(struct nfsd4_compoundargs),
1893 		.pc_ressize = sizeof(struct nfsd4_compoundres),
1894 		.pc_release = nfsd4_release_compoundargs,
1895 		.pc_cachetype = RC_NOCACHE,
1896 		.pc_xdrressize = NFSD_BUFSIZE/4,
1897 	},
1898 };
1899 
1900 struct svc_version	nfsd_version4 = {
1901 		.vs_vers	= 4,
1902 		.vs_nproc	= 2,
1903 		.vs_proc	= nfsd_procedures4,
1904 		.vs_dispatch	= nfsd_dispatch,
1905 		.vs_xdrsize	= NFS4_SVC_XDRSIZE,
1906 		.vs_rpcb_optnl	= 1,
1907 };
1908 
1909 /*
1910  * Local variables:
1911  *  c-basic-offset: 8
1912  * End:
1913  */
1914