xref: /openbmc/linux/fs/nfsd/nfs4proc.c (revision 62e7ca52)
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 			status = nfs4_check_open_reclaim(&open->op_clientid,
434 							 cstate->minorversion,
435 							 nn);
436 			if (status)
437 				goto out;
438 			open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
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 			dprintk("NFSD: unsupported OPEN claim type %d\n",
449 				open->op_claim_type);
450 			status = nfserr_notsupp;
451 			goto out;
452 		default:
453 			dprintk("NFSD: Invalid OPEN claim type %d\n",
454 				open->op_claim_type);
455 			status = nfserr_inval;
456 			goto out;
457 	}
458 	/*
459 	 * nfsd4_process_open2() does the actual opening of the file.  If
460 	 * successful, it (1) truncates the file if open->op_truncate was
461 	 * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
462 	 */
463 	status = nfsd4_process_open2(rqstp, resfh, open);
464 	WARN_ON(status && open->op_created);
465 out:
466 	if (resfh && resfh != &cstate->current_fh) {
467 		fh_dup2(&cstate->current_fh, resfh);
468 		fh_put(resfh);
469 		kfree(resfh);
470 	}
471 	nfsd4_cleanup_open_state(open, status);
472 	if (open->op_openowner && !nfsd4_has_session(cstate))
473 		cstate->replay_owner = &open->op_openowner->oo_owner;
474 	nfsd4_bump_seqid(cstate, status);
475 	if (!cstate->replay_owner)
476 		nfs4_unlock_state();
477 	return status;
478 }
479 
480 /*
481  * OPEN is the only seqid-mutating operation whose decoding can fail
482  * with a seqid-mutating error (specifically, decoding of user names in
483  * the attributes).  Therefore we have to do some processing to look up
484  * the stateowner so that we can bump the seqid.
485  */
486 static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
487 {
488 	struct nfsd4_open *open = (struct nfsd4_open *)&op->u;
489 
490 	if (!seqid_mutating_err(ntohl(op->status)))
491 		return op->status;
492 	if (nfsd4_has_session(cstate))
493 		return op->status;
494 	open->op_xdr_error = op->status;
495 	return nfsd4_open(rqstp, cstate, open);
496 }
497 
498 /*
499  * filehandle-manipulating ops.
500  */
501 static __be32
502 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
503 	    struct svc_fh **getfh)
504 {
505 	if (!cstate->current_fh.fh_dentry)
506 		return nfserr_nofilehandle;
507 
508 	*getfh = &cstate->current_fh;
509 	return nfs_ok;
510 }
511 
512 static __be32
513 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
514 	    struct nfsd4_putfh *putfh)
515 {
516 	fh_put(&cstate->current_fh);
517 	cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
518 	memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
519 	       putfh->pf_fhlen);
520 	return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
521 }
522 
523 static __be32
524 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
525 		void *arg)
526 {
527 	__be32 status;
528 
529 	fh_put(&cstate->current_fh);
530 	status = exp_pseudoroot(rqstp, &cstate->current_fh);
531 	return status;
532 }
533 
534 static __be32
535 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
536 		void *arg)
537 {
538 	if (!cstate->save_fh.fh_dentry)
539 		return nfserr_restorefh;
540 
541 	fh_dup2(&cstate->current_fh, &cstate->save_fh);
542 	if (HAS_STATE_ID(cstate, SAVED_STATE_ID_FLAG)) {
543 		memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
544 		SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
545 	}
546 	return nfs_ok;
547 }
548 
549 static __be32
550 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
551 	     void *arg)
552 {
553 	if (!cstate->current_fh.fh_dentry)
554 		return nfserr_nofilehandle;
555 
556 	fh_dup2(&cstate->save_fh, &cstate->current_fh);
557 	if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
558 		memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
559 		SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG);
560 	}
561 	return nfs_ok;
562 }
563 
564 /*
565  * misc nfsv4 ops
566  */
567 static __be32
568 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
569 	     struct nfsd4_access *access)
570 {
571 	if (access->ac_req_access & ~NFS3_ACCESS_FULL)
572 		return nfserr_inval;
573 
574 	access->ac_resp_access = access->ac_req_access;
575 	return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
576 			   &access->ac_supported);
577 }
578 
579 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
580 {
581 	__be32 verf[2];
582 	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
583 
584 	verf[0] = (__be32)nn->nfssvc_boot.tv_sec;
585 	verf[1] = (__be32)nn->nfssvc_boot.tv_usec;
586 	memcpy(verifier->data, verf, sizeof(verifier->data));
587 }
588 
589 static __be32
590 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
591 	     struct nfsd4_commit *commit)
592 {
593 	gen_boot_verifier(&commit->co_verf, SVC_NET(rqstp));
594 	return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
595 			     commit->co_count);
596 }
597 
598 static __be32
599 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
600 	     struct nfsd4_create *create)
601 {
602 	struct svc_fh resfh;
603 	__be32 status;
604 	dev_t rdev;
605 
606 	fh_init(&resfh, NFS4_FHSIZE);
607 
608 	status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
609 			   NFSD_MAY_CREATE);
610 	if (status)
611 		return status;
612 
613 	status = check_attr_support(rqstp, cstate, create->cr_bmval,
614 				    nfsd_attrmask);
615 	if (status)
616 		return status;
617 
618 	switch (create->cr_type) {
619 	case NF4LNK:
620 		status = nfsd_symlink(rqstp, &cstate->current_fh,
621 				      create->cr_name, create->cr_namelen,
622 				      create->cr_linkname, create->cr_linklen,
623 				      &resfh, &create->cr_iattr);
624 		break;
625 
626 	case NF4BLK:
627 		rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
628 		if (MAJOR(rdev) != create->cr_specdata1 ||
629 		    MINOR(rdev) != create->cr_specdata2)
630 			return nfserr_inval;
631 		status = nfsd_create(rqstp, &cstate->current_fh,
632 				     create->cr_name, create->cr_namelen,
633 				     &create->cr_iattr, S_IFBLK, rdev, &resfh);
634 		break;
635 
636 	case NF4CHR:
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_IFCHR, rdev, &resfh);
644 		break;
645 
646 	case NF4SOCK:
647 		status = nfsd_create(rqstp, &cstate->current_fh,
648 				     create->cr_name, create->cr_namelen,
649 				     &create->cr_iattr, S_IFSOCK, 0, &resfh);
650 		break;
651 
652 	case NF4FIFO:
653 		status = nfsd_create(rqstp, &cstate->current_fh,
654 				     create->cr_name, create->cr_namelen,
655 				     &create->cr_iattr, S_IFIFO, 0, &resfh);
656 		break;
657 
658 	case NF4DIR:
659 		create->cr_iattr.ia_valid &= ~ATTR_SIZE;
660 		status = nfsd_create(rqstp, &cstate->current_fh,
661 				     create->cr_name, create->cr_namelen,
662 				     &create->cr_iattr, S_IFDIR, 0, &resfh);
663 		break;
664 
665 	default:
666 		status = nfserr_badtype;
667 	}
668 
669 	if (status)
670 		goto out;
671 
672 	if (create->cr_label.len)
673 		nfsd4_security_inode_setsecctx(&resfh, &create->cr_label, create->cr_bmval);
674 
675 	if (create->cr_acl != NULL)
676 		do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
677 				create->cr_bmval);
678 
679 	fh_unlock(&cstate->current_fh);
680 	set_change_info(&create->cr_cinfo, &cstate->current_fh);
681 	fh_dup2(&cstate->current_fh, &resfh);
682 out:
683 	fh_put(&resfh);
684 	return status;
685 }
686 
687 static __be32
688 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
689 	      struct nfsd4_getattr *getattr)
690 {
691 	__be32 status;
692 
693 	status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
694 	if (status)
695 		return status;
696 
697 	if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
698 		return nfserr_inval;
699 
700 	getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
701 	getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
702 	getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
703 
704 	getattr->ga_fhp = &cstate->current_fh;
705 	return nfs_ok;
706 }
707 
708 static __be32
709 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
710 	   struct nfsd4_link *link)
711 {
712 	__be32 status = nfserr_nofilehandle;
713 
714 	if (!cstate->save_fh.fh_dentry)
715 		return status;
716 	status = nfsd_link(rqstp, &cstate->current_fh,
717 			   link->li_name, link->li_namelen, &cstate->save_fh);
718 	if (!status)
719 		set_change_info(&link->li_cinfo, &cstate->current_fh);
720 	return status;
721 }
722 
723 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
724 {
725 	struct svc_fh tmp_fh;
726 	__be32 ret;
727 
728 	fh_init(&tmp_fh, NFS4_FHSIZE);
729 	ret = exp_pseudoroot(rqstp, &tmp_fh);
730 	if (ret)
731 		return ret;
732 	if (tmp_fh.fh_dentry == fh->fh_dentry) {
733 		fh_put(&tmp_fh);
734 		return nfserr_noent;
735 	}
736 	fh_put(&tmp_fh);
737 	return nfsd_lookup(rqstp, fh, "..", 2, fh);
738 }
739 
740 static __be32
741 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
742 	      void *arg)
743 {
744 	return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
745 }
746 
747 static __be32
748 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
749 	     struct nfsd4_lookup *lookup)
750 {
751 	return nfsd_lookup(rqstp, &cstate->current_fh,
752 			   lookup->lo_name, lookup->lo_len,
753 			   &cstate->current_fh);
754 }
755 
756 static __be32
757 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
758 	   struct nfsd4_read *read)
759 {
760 	__be32 status;
761 
762 	/* no need to check permission - this will be done in nfsd_read() */
763 
764 	read->rd_filp = NULL;
765 	if (read->rd_offset >= OFFSET_MAX)
766 		return nfserr_inval;
767 
768 	/*
769 	 * If we do a zero copy read, then a client will see read data
770 	 * that reflects the state of the file *after* performing the
771 	 * following compound.
772 	 *
773 	 * To ensure proper ordering, we therefore turn off zero copy if
774 	 * the client wants us to do more in this compound:
775 	 */
776 	if (!nfsd4_last_compound_op(rqstp))
777 		rqstp->rq_splice_ok = false;
778 
779 	/* check stateid */
780 	if ((status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
781 						 cstate, &read->rd_stateid,
782 						 RD_STATE, &read->rd_filp))) {
783 		dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
784 		goto out;
785 	}
786 	status = nfs_ok;
787 out:
788 	read->rd_rqstp = rqstp;
789 	read->rd_fhp = &cstate->current_fh;
790 	return status;
791 }
792 
793 static __be32
794 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
795 	      struct nfsd4_readdir *readdir)
796 {
797 	u64 cookie = readdir->rd_cookie;
798 	static const nfs4_verifier zeroverf;
799 
800 	/* no need to check permission - this will be done in nfsd_readdir() */
801 
802 	if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
803 		return nfserr_inval;
804 
805 	readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
806 	readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
807 	readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
808 
809 	if ((cookie == 1) || (cookie == 2) ||
810 	    (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
811 		return nfserr_bad_cookie;
812 
813 	readdir->rd_rqstp = rqstp;
814 	readdir->rd_fhp = &cstate->current_fh;
815 	return nfs_ok;
816 }
817 
818 static __be32
819 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
820 	       struct nfsd4_readlink *readlink)
821 {
822 	readlink->rl_rqstp = rqstp;
823 	readlink->rl_fhp = &cstate->current_fh;
824 	return nfs_ok;
825 }
826 
827 static __be32
828 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
829 	     struct nfsd4_remove *remove)
830 {
831 	__be32 status;
832 
833 	if (locks_in_grace(SVC_NET(rqstp)))
834 		return nfserr_grace;
835 	status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
836 			     remove->rm_name, remove->rm_namelen);
837 	if (!status) {
838 		fh_unlock(&cstate->current_fh);
839 		set_change_info(&remove->rm_cinfo, &cstate->current_fh);
840 	}
841 	return status;
842 }
843 
844 static __be32
845 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
846 	     struct nfsd4_rename *rename)
847 {
848 	__be32 status = nfserr_nofilehandle;
849 
850 	if (!cstate->save_fh.fh_dentry)
851 		return status;
852 	if (locks_in_grace(SVC_NET(rqstp)) &&
853 		!(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
854 		return nfserr_grace;
855 	status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
856 			     rename->rn_snamelen, &cstate->current_fh,
857 			     rename->rn_tname, rename->rn_tnamelen);
858 	if (status)
859 		return status;
860 	set_change_info(&rename->rn_sinfo, &cstate->current_fh);
861 	set_change_info(&rename->rn_tinfo, &cstate->save_fh);
862 	return nfs_ok;
863 }
864 
865 static __be32
866 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
867 	      struct nfsd4_secinfo *secinfo)
868 {
869 	struct svc_fh resfh;
870 	struct svc_export *exp;
871 	struct dentry *dentry;
872 	__be32 err;
873 
874 	fh_init(&resfh, NFS4_FHSIZE);
875 	err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
876 	if (err)
877 		return err;
878 	err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
879 				    secinfo->si_name, secinfo->si_namelen,
880 				    &exp, &dentry);
881 	if (err)
882 		return err;
883 	if (dentry->d_inode == NULL) {
884 		exp_put(exp);
885 		err = nfserr_noent;
886 	} else
887 		secinfo->si_exp = exp;
888 	dput(dentry);
889 	if (cstate->minorversion)
890 		/* See rfc 5661 section 2.6.3.1.1.8 */
891 		fh_put(&cstate->current_fh);
892 	return err;
893 }
894 
895 static __be32
896 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
897 	      struct nfsd4_secinfo_no_name *sin)
898 {
899 	__be32 err;
900 
901 	switch (sin->sin_style) {
902 	case NFS4_SECINFO_STYLE4_CURRENT_FH:
903 		break;
904 	case NFS4_SECINFO_STYLE4_PARENT:
905 		err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
906 		if (err)
907 			return err;
908 		break;
909 	default:
910 		return nfserr_inval;
911 	}
912 	exp_get(cstate->current_fh.fh_export);
913 	sin->sin_exp = cstate->current_fh.fh_export;
914 	fh_put(&cstate->current_fh);
915 	return nfs_ok;
916 }
917 
918 static __be32
919 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
920 	      struct nfsd4_setattr *setattr)
921 {
922 	__be32 status = nfs_ok;
923 	int err;
924 
925 	if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
926 		status = nfs4_preprocess_stateid_op(SVC_NET(rqstp), cstate,
927 			&setattr->sa_stateid, WR_STATE, NULL);
928 		if (status) {
929 			dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
930 			return status;
931 		}
932 	}
933 	err = fh_want_write(&cstate->current_fh);
934 	if (err)
935 		return nfserrno(err);
936 	status = nfs_ok;
937 
938 	status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
939 				    nfsd_attrmask);
940 	if (status)
941 		goto out;
942 
943 	if (setattr->sa_acl != NULL)
944 		status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
945 					    setattr->sa_acl);
946 	if (status)
947 		goto out;
948 	if (setattr->sa_label.len)
949 		status = nfsd4_set_nfs4_label(rqstp, &cstate->current_fh,
950 				&setattr->sa_label);
951 	if (status)
952 		goto out;
953 	status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
954 				0, (time_t)0);
955 out:
956 	fh_drop_write(&cstate->current_fh);
957 	return status;
958 }
959 
960 static int fill_in_write_vector(struct kvec *vec, struct nfsd4_write *write)
961 {
962         int i = 1;
963         int buflen = write->wr_buflen;
964 
965         vec[0].iov_base = write->wr_head.iov_base;
966         vec[0].iov_len = min_t(int, buflen, write->wr_head.iov_len);
967         buflen -= vec[0].iov_len;
968 
969         while (buflen) {
970                 vec[i].iov_base = page_address(write->wr_pagelist[i - 1]);
971                 vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
972                 buflen -= vec[i].iov_len;
973                 i++;
974         }
975         return i;
976 }
977 
978 static __be32
979 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
980 	    struct nfsd4_write *write)
981 {
982 	stateid_t *stateid = &write->wr_stateid;
983 	struct file *filp = NULL;
984 	__be32 status = nfs_ok;
985 	unsigned long cnt;
986 	int nvecs;
987 
988 	/* no need to check permission - this will be done in nfsd_write() */
989 
990 	if (write->wr_offset >= OFFSET_MAX)
991 		return nfserr_inval;
992 
993 	status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
994 					cstate, stateid, WR_STATE, &filp);
995 	if (status) {
996 		dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
997 		return status;
998 	}
999 
1000 	cnt = write->wr_buflen;
1001 	write->wr_how_written = write->wr_stable_how;
1002 	gen_boot_verifier(&write->wr_verifier, SVC_NET(rqstp));
1003 
1004 	nvecs = fill_in_write_vector(rqstp->rq_vec, write);
1005 	WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1006 
1007 	status =  nfsd_write(rqstp, &cstate->current_fh, filp,
1008 			     write->wr_offset, rqstp->rq_vec, nvecs,
1009 			     &cnt, &write->wr_how_written);
1010 	if (filp)
1011 		fput(filp);
1012 
1013 	write->wr_bytes_written = cnt;
1014 
1015 	return status;
1016 }
1017 
1018 /* This routine never returns NFS_OK!  If there are no other errors, it
1019  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
1020  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
1021  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
1022  */
1023 static __be32
1024 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1025 	     struct nfsd4_verify *verify)
1026 {
1027 	__be32 *buf, *p;
1028 	int count;
1029 	__be32 status;
1030 
1031 	status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
1032 	if (status)
1033 		return status;
1034 
1035 	status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
1036 	if (status)
1037 		return status;
1038 
1039 	if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1040 	    || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1041 		return nfserr_inval;
1042 	if (verify->ve_attrlen & 3)
1043 		return nfserr_inval;
1044 
1045 	/* count in words:
1046 	 *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1047 	 */
1048 	count = 4 + (verify->ve_attrlen >> 2);
1049 	buf = kmalloc(count << 2, GFP_KERNEL);
1050 	if (!buf)
1051 		return nfserr_jukebox;
1052 
1053 	p = buf;
1054 	status = nfsd4_encode_fattr_to_buf(&p, count, &cstate->current_fh,
1055 				    cstate->current_fh.fh_export,
1056 				    cstate->current_fh.fh_dentry,
1057 				    verify->ve_bmval,
1058 				    rqstp, 0);
1059 	/*
1060 	 * If nfsd4_encode_fattr() ran out of space, assume that's because
1061 	 * the attributes are longer (hence different) than those given:
1062 	 */
1063 	if (status == nfserr_resource)
1064 		status = nfserr_not_same;
1065 	if (status)
1066 		goto out_kfree;
1067 
1068 	/* skip bitmap */
1069 	p = buf + 1 + ntohl(buf[0]);
1070 	status = nfserr_not_same;
1071 	if (ntohl(*p++) != verify->ve_attrlen)
1072 		goto out_kfree;
1073 	if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1074 		status = nfserr_same;
1075 
1076 out_kfree:
1077 	kfree(buf);
1078 	return status;
1079 }
1080 
1081 static __be32
1082 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1083 	      struct nfsd4_verify *verify)
1084 {
1085 	__be32 status;
1086 
1087 	status = _nfsd4_verify(rqstp, cstate, verify);
1088 	return status == nfserr_not_same ? nfs_ok : status;
1089 }
1090 
1091 static __be32
1092 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1093 	     struct nfsd4_verify *verify)
1094 {
1095 	__be32 status;
1096 
1097 	status = _nfsd4_verify(rqstp, cstate, verify);
1098 	return status == nfserr_same ? nfs_ok : status;
1099 }
1100 
1101 /*
1102  * NULL call.
1103  */
1104 static __be32
1105 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
1106 {
1107 	return nfs_ok;
1108 }
1109 
1110 static inline void nfsd4_increment_op_stats(u32 opnum)
1111 {
1112 	if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1113 		nfsdstats.nfs4_opcount[opnum]++;
1114 }
1115 
1116 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1117 			      void *);
1118 typedef u32(*nfsd4op_rsize)(struct svc_rqst *, struct nfsd4_op *op);
1119 typedef void(*stateid_setter)(struct nfsd4_compound_state *, void *);
1120 typedef void(*stateid_getter)(struct nfsd4_compound_state *, void *);
1121 
1122 enum nfsd4_op_flags {
1123 	ALLOWED_WITHOUT_FH = 1 << 0,	/* No current filehandle required */
1124 	ALLOWED_ON_ABSENT_FS = 1 << 1,	/* ops processed on absent fs */
1125 	ALLOWED_AS_FIRST_OP = 1 << 2,	/* ops reqired first in compound */
1126 	/* For rfc 5661 section 2.6.3.1.1: */
1127 	OP_HANDLES_WRONGSEC = 1 << 3,
1128 	OP_IS_PUTFH_LIKE = 1 << 4,
1129 	/*
1130 	 * These are the ops whose result size we estimate before
1131 	 * encoding, to avoid performing an op then not being able to
1132 	 * respond or cache a response.  This includes writes and setattrs
1133 	 * as well as the operations usually called "nonidempotent":
1134 	 */
1135 	OP_MODIFIES_SOMETHING = 1 << 5,
1136 	/*
1137 	 * Cache compounds containing these ops in the xid-based drc:
1138 	 * We use the DRC for compounds containing non-idempotent
1139 	 * operations, *except* those that are 4.1-specific (since
1140 	 * sessions provide their own EOS), and except for stateful
1141 	 * operations other than setclientid and setclientid_confirm
1142 	 * (since sequence numbers provide EOS for open, lock, etc in
1143 	 * the v4.0 case).
1144 	 */
1145 	OP_CACHEME = 1 << 6,
1146 	/*
1147 	 * These are ops which clear current state id.
1148 	 */
1149 	OP_CLEAR_STATEID = 1 << 7,
1150 };
1151 
1152 struct nfsd4_operation {
1153 	nfsd4op_func op_func;
1154 	u32 op_flags;
1155 	char *op_name;
1156 	/* Try to get response size before operation */
1157 	nfsd4op_rsize op_rsize_bop;
1158 	stateid_getter op_get_currentstateid;
1159 	stateid_setter op_set_currentstateid;
1160 };
1161 
1162 static struct nfsd4_operation nfsd4_ops[];
1163 
1164 static const char *nfsd4_op_name(unsigned opnum);
1165 
1166 /*
1167  * Enforce NFSv4.1 COMPOUND ordering rules:
1168  *
1169  * Also note, enforced elsewhere:
1170  *	- SEQUENCE other than as first op results in
1171  *	  NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1172  *	- BIND_CONN_TO_SESSION must be the only op in its compound.
1173  *	  (Enforced in nfsd4_bind_conn_to_session().)
1174  *	- DESTROY_SESSION must be the final operation in a compound, if
1175  *	  sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1176  *	  (Enforced in nfsd4_destroy_session().)
1177  */
1178 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1179 {
1180 	struct nfsd4_op *op = &args->ops[0];
1181 
1182 	/* These ordering requirements don't apply to NFSv4.0: */
1183 	if (args->minorversion == 0)
1184 		return nfs_ok;
1185 	/* This is weird, but OK, not our problem: */
1186 	if (args->opcnt == 0)
1187 		return nfs_ok;
1188 	if (op->status == nfserr_op_illegal)
1189 		return nfs_ok;
1190 	if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1191 		return nfserr_op_not_in_session;
1192 	if (op->opnum == OP_SEQUENCE)
1193 		return nfs_ok;
1194 	if (args->opcnt != 1)
1195 		return nfserr_not_only_op;
1196 	return nfs_ok;
1197 }
1198 
1199 static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1200 {
1201 	return &nfsd4_ops[op->opnum];
1202 }
1203 
1204 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1205 {
1206 	if (op->opnum == OP_ILLEGAL)
1207 		return false;
1208 	return OPDESC(op)->op_flags & OP_CACHEME;
1209 }
1210 
1211 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1212 {
1213 	struct nfsd4_compoundres *resp = rqstp->rq_resp;
1214 	struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1215 	struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1216 	struct nfsd4_op *next = &argp->ops[resp->opcnt];
1217 	struct nfsd4_operation *thisd;
1218 	struct nfsd4_operation *nextd;
1219 
1220 	thisd = OPDESC(this);
1221 	/*
1222 	 * Most ops check wronsec on our own; only the putfh-like ops
1223 	 * have special rules.
1224 	 */
1225 	if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1226 		return false;
1227 	/*
1228 	 * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1229 	 * put-filehandle operation if we're not going to use the
1230 	 * result:
1231 	 */
1232 	if (argp->opcnt == resp->opcnt)
1233 		return false;
1234 
1235 	nextd = OPDESC(next);
1236 	/*
1237 	 * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1238 	 * errors themselves as necessary; others should check for them
1239 	 * now:
1240 	 */
1241 	return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1242 }
1243 
1244 static void svcxdr_init_encode(struct svc_rqst *rqstp,
1245 			       struct nfsd4_compoundres *resp)
1246 {
1247 	struct xdr_stream *xdr = &resp->xdr;
1248 	struct xdr_buf *buf = &rqstp->rq_res;
1249 	struct kvec *head = buf->head;
1250 
1251 	xdr->buf = buf;
1252 	xdr->iov = head;
1253 	xdr->p   = head->iov_base + head->iov_len;
1254 	xdr->end = head->iov_base + PAGE_SIZE - rqstp->rq_auth_slack;
1255 	/* Tail and page_len should be zero at this point: */
1256 	buf->len = buf->head[0].iov_len;
1257 	xdr->scratch.iov_len = 0;
1258 	xdr->page_ptr = buf->pages - 1;
1259 	buf->buflen = PAGE_SIZE * (1 + rqstp->rq_page_end - buf->pages)
1260 		- rqstp->rq_auth_slack;
1261 }
1262 
1263 /*
1264  * COMPOUND call.
1265  */
1266 static __be32
1267 nfsd4_proc_compound(struct svc_rqst *rqstp,
1268 		    struct nfsd4_compoundargs *args,
1269 		    struct nfsd4_compoundres *resp)
1270 {
1271 	struct nfsd4_op	*op;
1272 	struct nfsd4_operation *opdesc;
1273 	struct nfsd4_compound_state *cstate = &resp->cstate;
1274 	struct svc_fh *current_fh = &cstate->current_fh;
1275 	struct svc_fh *save_fh = &cstate->save_fh;
1276 	__be32		status;
1277 
1278 	svcxdr_init_encode(rqstp, resp);
1279 	resp->tagp = resp->xdr.p;
1280 	/* reserve space for: taglen, tag, and opcnt */
1281 	xdr_reserve_space(&resp->xdr, 8 + args->taglen);
1282 	resp->taglen = args->taglen;
1283 	resp->tag = args->tag;
1284 	resp->rqstp = rqstp;
1285 	cstate->minorversion = args->minorversion;
1286 	fh_init(current_fh, NFS4_FHSIZE);
1287 	fh_init(save_fh, NFS4_FHSIZE);
1288 	/*
1289 	 * Don't use the deferral mechanism for NFSv4; compounds make it
1290 	 * too hard to avoid non-idempotency problems.
1291 	 */
1292 	rqstp->rq_usedeferral = 0;
1293 
1294 	/*
1295 	 * According to RFC3010, this takes precedence over all other errors.
1296 	 */
1297 	status = nfserr_minor_vers_mismatch;
1298 	if (nfsd_minorversion(args->minorversion, NFSD_TEST) <= 0)
1299 		goto out;
1300 
1301 	status = nfs41_check_op_ordering(args);
1302 	if (status) {
1303 		op = &args->ops[0];
1304 		op->status = status;
1305 		goto encode_op;
1306 	}
1307 
1308 	while (!status && resp->opcnt < args->opcnt) {
1309 		op = &args->ops[resp->opcnt++];
1310 
1311 		dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1312 			resp->opcnt, args->opcnt, op->opnum,
1313 			nfsd4_op_name(op->opnum));
1314 		/*
1315 		 * The XDR decode routines may have pre-set op->status;
1316 		 * for example, if there is a miscellaneous XDR error
1317 		 * it will be set to nfserr_bad_xdr.
1318 		 */
1319 		if (op->status) {
1320 			if (op->opnum == OP_OPEN)
1321 				op->status = nfsd4_open_omfg(rqstp, cstate, op);
1322 			goto encode_op;
1323 		}
1324 
1325 		opdesc = OPDESC(op);
1326 
1327 		if (!current_fh->fh_dentry) {
1328 			if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1329 				op->status = nfserr_nofilehandle;
1330 				goto encode_op;
1331 			}
1332 		} else if (current_fh->fh_export->ex_fslocs.migrated &&
1333 			  !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1334 			op->status = nfserr_moved;
1335 			goto encode_op;
1336 		}
1337 
1338 		fh_clear_wcc(current_fh);
1339 
1340 		/* If op is non-idempotent */
1341 		if (opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1342 			/*
1343 			 * Don't execute this op if we couldn't encode a
1344 			 * succesful reply:
1345 			 */
1346 			u32 plen = opdesc->op_rsize_bop(rqstp, op);
1347 			/*
1348 			 * Plus if there's another operation, make sure
1349 			 * we'll have space to at least encode an error:
1350 			 */
1351 			if (resp->opcnt < args->opcnt)
1352 				plen += COMPOUND_ERR_SLACK_SPACE;
1353 			op->status = nfsd4_check_resp_size(resp, plen);
1354 		}
1355 
1356 		if (op->status)
1357 			goto encode_op;
1358 
1359 		if (opdesc->op_get_currentstateid)
1360 			opdesc->op_get_currentstateid(cstate, &op->u);
1361 		op->status = opdesc->op_func(rqstp, cstate, &op->u);
1362 
1363 		if (!op->status) {
1364 			if (opdesc->op_set_currentstateid)
1365 				opdesc->op_set_currentstateid(cstate, &op->u);
1366 
1367 			if (opdesc->op_flags & OP_CLEAR_STATEID)
1368 				clear_current_stateid(cstate);
1369 
1370 			if (need_wrongsec_check(rqstp))
1371 				op->status = check_nfsd_access(current_fh->fh_export, rqstp);
1372 		}
1373 
1374 encode_op:
1375 		/* Only from SEQUENCE */
1376 		if (cstate->status == nfserr_replay_cache) {
1377 			dprintk("%s NFS4.1 replay from cache\n", __func__);
1378 			status = op->status;
1379 			goto out;
1380 		}
1381 		if (op->status == nfserr_replay_me) {
1382 			op->replay = &cstate->replay_owner->so_replay;
1383 			nfsd4_encode_replay(&resp->xdr, op);
1384 			status = op->status = op->replay->rp_status;
1385 		} else {
1386 			nfsd4_encode_operation(resp, op);
1387 			status = op->status;
1388 		}
1389 
1390 		dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1391 			args->ops, args->opcnt, resp->opcnt, op->opnum,
1392 			be32_to_cpu(status));
1393 
1394 		if (cstate->replay_owner) {
1395 			nfs4_unlock_state();
1396 			cstate->replay_owner = NULL;
1397 		}
1398 		/* XXX Ugh, we need to get rid of this kind of special case: */
1399 		if (op->opnum == OP_READ && op->u.read.rd_filp)
1400 			fput(op->u.read.rd_filp);
1401 
1402 		nfsd4_increment_op_stats(op->opnum);
1403 	}
1404 
1405 	cstate->status = status;
1406 	fh_put(current_fh);
1407 	fh_put(save_fh);
1408 	BUG_ON(cstate->replay_owner);
1409 out:
1410 	/* Reset deferral mechanism for RPC deferrals */
1411 	rqstp->rq_usedeferral = 1;
1412 	dprintk("nfsv4 compound returned %d\n", ntohl(status));
1413 	return status;
1414 }
1415 
1416 #define op_encode_hdr_size		(2)
1417 #define op_encode_stateid_maxsz		(XDR_QUADLEN(NFS4_STATEID_SIZE))
1418 #define op_encode_verifier_maxsz	(XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1419 #define op_encode_change_info_maxsz	(5)
1420 #define nfs4_fattr_bitmap_maxsz		(4)
1421 
1422 /* We'll fall back on returning no lockowner if run out of space: */
1423 #define op_encode_lockowner_maxsz	(0)
1424 #define op_encode_lock_denied_maxsz	(8 + op_encode_lockowner_maxsz)
1425 
1426 #define nfs4_owner_maxsz		(1 + XDR_QUADLEN(IDMAP_NAMESZ))
1427 
1428 #define op_encode_ace_maxsz		(3 + nfs4_owner_maxsz)
1429 #define op_encode_delegation_maxsz	(1 + op_encode_stateid_maxsz + 1 + \
1430 					 op_encode_ace_maxsz)
1431 
1432 #define op_encode_channel_attrs_maxsz	(6 + 1 + 1)
1433 
1434 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1435 {
1436 	return (op_encode_hdr_size) * sizeof(__be32);
1437 }
1438 
1439 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1440 {
1441 	return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1442 }
1443 
1444 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1445 {
1446 	return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1447 }
1448 
1449 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1450 {
1451 	return (op_encode_hdr_size + op_encode_change_info_maxsz
1452 		+ nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1453 }
1454 
1455 /*
1456  * Note since this is an idempotent operation we won't insist on failing
1457  * the op prematurely if the estimate is too large.  We may turn off splice
1458  * reads unnecessarily.
1459  */
1460 static inline u32 nfsd4_getattr_rsize(struct svc_rqst *rqstp,
1461 				      struct nfsd4_op *op)
1462 {
1463 	u32 *bmap = op->u.getattr.ga_bmval;
1464 	u32 bmap0 = bmap[0], bmap1 = bmap[1], bmap2 = bmap[2];
1465 	u32 ret = 0;
1466 
1467 	if (bmap0 & FATTR4_WORD0_ACL)
1468 		return svc_max_payload(rqstp);
1469 	if (bmap0 & FATTR4_WORD0_FS_LOCATIONS)
1470 		return svc_max_payload(rqstp);
1471 
1472 	if (bmap1 & FATTR4_WORD1_OWNER) {
1473 		ret += IDMAP_NAMESZ + 4;
1474 		bmap1 &= ~FATTR4_WORD1_OWNER;
1475 	}
1476 	if (bmap1 & FATTR4_WORD1_OWNER_GROUP) {
1477 		ret += IDMAP_NAMESZ + 4;
1478 		bmap1 &= ~FATTR4_WORD1_OWNER_GROUP;
1479 	}
1480 	if (bmap0 & FATTR4_WORD0_FILEHANDLE) {
1481 		ret += NFS4_FHSIZE + 4;
1482 		bmap0 &= ~FATTR4_WORD0_FILEHANDLE;
1483 	}
1484 	if (bmap2 & FATTR4_WORD2_SECURITY_LABEL) {
1485 		ret += NFSD4_MAX_SEC_LABEL_LEN + 12;
1486 		bmap2 &= ~FATTR4_WORD2_SECURITY_LABEL;
1487 	}
1488 	/*
1489 	 * Largest of remaining attributes are 16 bytes (e.g.,
1490 	 * supported_attributes)
1491 	 */
1492 	ret += 16 * (hweight32(bmap0) + hweight32(bmap1) + hweight32(bmap2));
1493 	/* bitmask, length */
1494 	ret += 20;
1495 	return ret;
1496 }
1497 
1498 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1499 {
1500 	return (op_encode_hdr_size + op_encode_change_info_maxsz)
1501 		* sizeof(__be32);
1502 }
1503 
1504 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1505 {
1506 	return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1507 		* sizeof(__be32);
1508 }
1509 
1510 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1511 {
1512 	return (op_encode_hdr_size + op_encode_stateid_maxsz
1513 		+ op_encode_change_info_maxsz + 1
1514 		+ nfs4_fattr_bitmap_maxsz
1515 		+ op_encode_delegation_maxsz) * sizeof(__be32);
1516 }
1517 
1518 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1519 {
1520 	u32 maxcount = 0, rlen = 0;
1521 
1522 	maxcount = svc_max_payload(rqstp);
1523 	rlen = op->u.read.rd_length;
1524 
1525 	if (rlen > maxcount)
1526 		rlen = maxcount;
1527 
1528 	return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
1529 }
1530 
1531 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1532 {
1533 	u32 maxcount = svc_max_payload(rqstp);
1534 	u32 rlen = op->u.readdir.rd_maxcount;
1535 
1536 	if (rlen > maxcount)
1537 		rlen = maxcount;
1538 
1539 	return (op_encode_hdr_size + op_encode_verifier_maxsz +
1540 		XDR_QUADLEN(rlen)) * sizeof(__be32);
1541 }
1542 
1543 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1544 {
1545 	return (op_encode_hdr_size + op_encode_change_info_maxsz)
1546 		* sizeof(__be32);
1547 }
1548 
1549 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1550 {
1551 	return (op_encode_hdr_size + op_encode_change_info_maxsz
1552 		+ op_encode_change_info_maxsz) * sizeof(__be32);
1553 }
1554 
1555 static inline u32 nfsd4_sequence_rsize(struct svc_rqst *rqstp,
1556 				       struct nfsd4_op *op)
1557 {
1558 	return NFS4_MAX_SESSIONID_LEN + 20;
1559 }
1560 
1561 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1562 {
1563 	return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1564 }
1565 
1566 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1567 {
1568 	return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
1569 								sizeof(__be32);
1570 }
1571 
1572 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1573 {
1574 	return (op_encode_hdr_size + 2 + op_encode_verifier_maxsz) * sizeof(__be32);
1575 }
1576 
1577 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1578 {
1579 	return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
1580 		1 + 1 + /* eir_flags, spr_how */\
1581 		4 + /* spo_must_enforce & _allow with bitmap */\
1582 		2 + /*eir_server_owner.so_minor_id */\
1583 		/* eir_server_owner.so_major_id<> */\
1584 		XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1585 		/* eir_server_scope<> */\
1586 		XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1587 		1 + /* eir_server_impl_id array length */\
1588 		0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
1589 }
1590 
1591 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1592 {
1593 	return (op_encode_hdr_size + \
1594 		XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
1595 		2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
1596 }
1597 
1598 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1599 {
1600 	return (op_encode_hdr_size + \
1601 		XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
1602 		2 + /* csr_sequence, csr_flags */\
1603 		op_encode_channel_attrs_maxsz + \
1604 		op_encode_channel_attrs_maxsz) * sizeof(__be32);
1605 }
1606 
1607 static struct nfsd4_operation nfsd4_ops[] = {
1608 	[OP_ACCESS] = {
1609 		.op_func = (nfsd4op_func)nfsd4_access,
1610 		.op_name = "OP_ACCESS",
1611 	},
1612 	[OP_CLOSE] = {
1613 		.op_func = (nfsd4op_func)nfsd4_close,
1614 		.op_flags = OP_MODIFIES_SOMETHING,
1615 		.op_name = "OP_CLOSE",
1616 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1617 		.op_get_currentstateid = (stateid_getter)nfsd4_get_closestateid,
1618 		.op_set_currentstateid = (stateid_setter)nfsd4_set_closestateid,
1619 	},
1620 	[OP_COMMIT] = {
1621 		.op_func = (nfsd4op_func)nfsd4_commit,
1622 		.op_flags = OP_MODIFIES_SOMETHING,
1623 		.op_name = "OP_COMMIT",
1624 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_commit_rsize,
1625 	},
1626 	[OP_CREATE] = {
1627 		.op_func = (nfsd4op_func)nfsd4_create,
1628 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
1629 		.op_name = "OP_CREATE",
1630 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_create_rsize,
1631 	},
1632 	[OP_DELEGRETURN] = {
1633 		.op_func = (nfsd4op_func)nfsd4_delegreturn,
1634 		.op_flags = OP_MODIFIES_SOMETHING,
1635 		.op_name = "OP_DELEGRETURN",
1636 		.op_rsize_bop = nfsd4_only_status_rsize,
1637 		.op_get_currentstateid = (stateid_getter)nfsd4_get_delegreturnstateid,
1638 	},
1639 	[OP_GETATTR] = {
1640 		.op_func = (nfsd4op_func)nfsd4_getattr,
1641 		.op_flags = ALLOWED_ON_ABSENT_FS,
1642 		.op_rsize_bop = nfsd4_getattr_rsize,
1643 		.op_name = "OP_GETATTR",
1644 	},
1645 	[OP_GETFH] = {
1646 		.op_func = (nfsd4op_func)nfsd4_getfh,
1647 		.op_name = "OP_GETFH",
1648 	},
1649 	[OP_LINK] = {
1650 		.op_func = (nfsd4op_func)nfsd4_link,
1651 		.op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
1652 				| OP_CACHEME,
1653 		.op_name = "OP_LINK",
1654 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_link_rsize,
1655 	},
1656 	[OP_LOCK] = {
1657 		.op_func = (nfsd4op_func)nfsd4_lock,
1658 		.op_flags = OP_MODIFIES_SOMETHING,
1659 		.op_name = "OP_LOCK",
1660 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_lock_rsize,
1661 		.op_set_currentstateid = (stateid_setter)nfsd4_set_lockstateid,
1662 	},
1663 	[OP_LOCKT] = {
1664 		.op_func = (nfsd4op_func)nfsd4_lockt,
1665 		.op_name = "OP_LOCKT",
1666 	},
1667 	[OP_LOCKU] = {
1668 		.op_func = (nfsd4op_func)nfsd4_locku,
1669 		.op_flags = OP_MODIFIES_SOMETHING,
1670 		.op_name = "OP_LOCKU",
1671 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1672 		.op_get_currentstateid = (stateid_getter)nfsd4_get_lockustateid,
1673 	},
1674 	[OP_LOOKUP] = {
1675 		.op_func = (nfsd4op_func)nfsd4_lookup,
1676 		.op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1677 		.op_name = "OP_LOOKUP",
1678 	},
1679 	[OP_LOOKUPP] = {
1680 		.op_func = (nfsd4op_func)nfsd4_lookupp,
1681 		.op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1682 		.op_name = "OP_LOOKUPP",
1683 	},
1684 	[OP_NVERIFY] = {
1685 		.op_func = (nfsd4op_func)nfsd4_nverify,
1686 		.op_name = "OP_NVERIFY",
1687 	},
1688 	[OP_OPEN] = {
1689 		.op_func = (nfsd4op_func)nfsd4_open,
1690 		.op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1691 		.op_name = "OP_OPEN",
1692 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_open_rsize,
1693 		.op_set_currentstateid = (stateid_setter)nfsd4_set_openstateid,
1694 	},
1695 	[OP_OPEN_CONFIRM] = {
1696 		.op_func = (nfsd4op_func)nfsd4_open_confirm,
1697 		.op_flags = OP_MODIFIES_SOMETHING,
1698 		.op_name = "OP_OPEN_CONFIRM",
1699 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1700 	},
1701 	[OP_OPEN_DOWNGRADE] = {
1702 		.op_func = (nfsd4op_func)nfsd4_open_downgrade,
1703 		.op_flags = OP_MODIFIES_SOMETHING,
1704 		.op_name = "OP_OPEN_DOWNGRADE",
1705 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1706 		.op_get_currentstateid = (stateid_getter)nfsd4_get_opendowngradestateid,
1707 		.op_set_currentstateid = (stateid_setter)nfsd4_set_opendowngradestateid,
1708 	},
1709 	[OP_PUTFH] = {
1710 		.op_func = (nfsd4op_func)nfsd4_putfh,
1711 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1712 				| OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
1713 		.op_name = "OP_PUTFH",
1714 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1715 	},
1716 	[OP_PUTPUBFH] = {
1717 		.op_func = (nfsd4op_func)nfsd4_putrootfh,
1718 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1719 				| OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
1720 		.op_name = "OP_PUTPUBFH",
1721 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1722 	},
1723 	[OP_PUTROOTFH] = {
1724 		.op_func = (nfsd4op_func)nfsd4_putrootfh,
1725 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1726 				| OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
1727 		.op_name = "OP_PUTROOTFH",
1728 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1729 	},
1730 	[OP_READ] = {
1731 		.op_func = (nfsd4op_func)nfsd4_read,
1732 		.op_name = "OP_READ",
1733 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_read_rsize,
1734 		.op_get_currentstateid = (stateid_getter)nfsd4_get_readstateid,
1735 	},
1736 	[OP_READDIR] = {
1737 		.op_func = (nfsd4op_func)nfsd4_readdir,
1738 		.op_name = "OP_READDIR",
1739 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_readdir_rsize,
1740 	},
1741 	[OP_READLINK] = {
1742 		.op_func = (nfsd4op_func)nfsd4_readlink,
1743 		.op_name = "OP_READLINK",
1744 	},
1745 	[OP_REMOVE] = {
1746 		.op_func = (nfsd4op_func)nfsd4_remove,
1747 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1748 		.op_name = "OP_REMOVE",
1749 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_remove_rsize,
1750 	},
1751 	[OP_RENAME] = {
1752 		.op_func = (nfsd4op_func)nfsd4_rename,
1753 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1754 		.op_name = "OP_RENAME",
1755 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_rename_rsize,
1756 	},
1757 	[OP_RENEW] = {
1758 		.op_func = (nfsd4op_func)nfsd4_renew,
1759 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1760 				| OP_MODIFIES_SOMETHING,
1761 		.op_name = "OP_RENEW",
1762 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1763 
1764 	},
1765 	[OP_RESTOREFH] = {
1766 		.op_func = (nfsd4op_func)nfsd4_restorefh,
1767 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1768 				| OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
1769 		.op_name = "OP_RESTOREFH",
1770 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1771 	},
1772 	[OP_SAVEFH] = {
1773 		.op_func = (nfsd4op_func)nfsd4_savefh,
1774 		.op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1775 		.op_name = "OP_SAVEFH",
1776 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1777 	},
1778 	[OP_SECINFO] = {
1779 		.op_func = (nfsd4op_func)nfsd4_secinfo,
1780 		.op_flags = OP_HANDLES_WRONGSEC,
1781 		.op_name = "OP_SECINFO",
1782 	},
1783 	[OP_SETATTR] = {
1784 		.op_func = (nfsd4op_func)nfsd4_setattr,
1785 		.op_name = "OP_SETATTR",
1786 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1787 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_setattr_rsize,
1788 		.op_get_currentstateid = (stateid_getter)nfsd4_get_setattrstateid,
1789 	},
1790 	[OP_SETCLIENTID] = {
1791 		.op_func = (nfsd4op_func)nfsd4_setclientid,
1792 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1793 				| OP_MODIFIES_SOMETHING | OP_CACHEME,
1794 		.op_name = "OP_SETCLIENTID",
1795 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_setclientid_rsize,
1796 	},
1797 	[OP_SETCLIENTID_CONFIRM] = {
1798 		.op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1799 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1800 				| OP_MODIFIES_SOMETHING | OP_CACHEME,
1801 		.op_name = "OP_SETCLIENTID_CONFIRM",
1802 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1803 	},
1804 	[OP_VERIFY] = {
1805 		.op_func = (nfsd4op_func)nfsd4_verify,
1806 		.op_name = "OP_VERIFY",
1807 	},
1808 	[OP_WRITE] = {
1809 		.op_func = (nfsd4op_func)nfsd4_write,
1810 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1811 		.op_name = "OP_WRITE",
1812 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
1813 		.op_get_currentstateid = (stateid_getter)nfsd4_get_writestateid,
1814 	},
1815 	[OP_RELEASE_LOCKOWNER] = {
1816 		.op_func = (nfsd4op_func)nfsd4_release_lockowner,
1817 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1818 				| OP_MODIFIES_SOMETHING,
1819 		.op_name = "OP_RELEASE_LOCKOWNER",
1820 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1821 	},
1822 
1823 	/* NFSv4.1 operations */
1824 	[OP_EXCHANGE_ID] = {
1825 		.op_func = (nfsd4op_func)nfsd4_exchange_id,
1826 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1827 				| OP_MODIFIES_SOMETHING,
1828 		.op_name = "OP_EXCHANGE_ID",
1829 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_exchange_id_rsize,
1830 	},
1831 	[OP_BACKCHANNEL_CTL] = {
1832 		.op_func = (nfsd4op_func)nfsd4_backchannel_ctl,
1833 		.op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1834 		.op_name = "OP_BACKCHANNEL_CTL",
1835 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1836 	},
1837 	[OP_BIND_CONN_TO_SESSION] = {
1838 		.op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
1839 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1840 				| OP_MODIFIES_SOMETHING,
1841 		.op_name = "OP_BIND_CONN_TO_SESSION",
1842 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_bind_conn_to_session_rsize,
1843 	},
1844 	[OP_CREATE_SESSION] = {
1845 		.op_func = (nfsd4op_func)nfsd4_create_session,
1846 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1847 				| OP_MODIFIES_SOMETHING,
1848 		.op_name = "OP_CREATE_SESSION",
1849 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_create_session_rsize,
1850 	},
1851 	[OP_DESTROY_SESSION] = {
1852 		.op_func = (nfsd4op_func)nfsd4_destroy_session,
1853 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1854 				| OP_MODIFIES_SOMETHING,
1855 		.op_name = "OP_DESTROY_SESSION",
1856 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1857 	},
1858 	[OP_SEQUENCE] = {
1859 		.op_func = (nfsd4op_func)nfsd4_sequence,
1860 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1861 		.op_name = "OP_SEQUENCE",
1862 	},
1863 	[OP_DESTROY_CLIENTID] = {
1864 		.op_func = (nfsd4op_func)nfsd4_destroy_clientid,
1865 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1866 				| OP_MODIFIES_SOMETHING,
1867 		.op_name = "OP_DESTROY_CLIENTID",
1868 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1869 	},
1870 	[OP_RECLAIM_COMPLETE] = {
1871 		.op_func = (nfsd4op_func)nfsd4_reclaim_complete,
1872 		.op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1873 		.op_name = "OP_RECLAIM_COMPLETE",
1874 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1875 	},
1876 	[OP_SECINFO_NO_NAME] = {
1877 		.op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
1878 		.op_flags = OP_HANDLES_WRONGSEC,
1879 		.op_name = "OP_SECINFO_NO_NAME",
1880 	},
1881 	[OP_TEST_STATEID] = {
1882 		.op_func = (nfsd4op_func)nfsd4_test_stateid,
1883 		.op_flags = ALLOWED_WITHOUT_FH,
1884 		.op_name = "OP_TEST_STATEID",
1885 	},
1886 	[OP_FREE_STATEID] = {
1887 		.op_func = (nfsd4op_func)nfsd4_free_stateid,
1888 		.op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1889 		.op_name = "OP_FREE_STATEID",
1890 		.op_get_currentstateid = (stateid_getter)nfsd4_get_freestateid,
1891 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1892 	},
1893 };
1894 
1895 int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
1896 {
1897 	struct nfsd4_operation *opdesc;
1898 	nfsd4op_rsize estimator;
1899 
1900 	if (op->opnum == OP_ILLEGAL)
1901 		return op_encode_hdr_size * sizeof(__be32);
1902 	opdesc = OPDESC(op);
1903 	estimator = opdesc->op_rsize_bop;
1904 	return estimator ? estimator(rqstp, op) : PAGE_SIZE;
1905 }
1906 
1907 void warn_on_nonidempotent_op(struct nfsd4_op *op)
1908 {
1909 	if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
1910 		pr_err("unable to encode reply to nonidempotent op %d (%s)\n",
1911 			op->opnum, nfsd4_op_name(op->opnum));
1912 		WARN_ON_ONCE(1);
1913 	}
1914 }
1915 
1916 static const char *nfsd4_op_name(unsigned opnum)
1917 {
1918 	if (opnum < ARRAY_SIZE(nfsd4_ops))
1919 		return nfsd4_ops[opnum].op_name;
1920 	return "unknown_operation";
1921 }
1922 
1923 #define nfsd4_voidres			nfsd4_voidargs
1924 struct nfsd4_voidargs { int dummy; };
1925 
1926 static struct svc_procedure		nfsd_procedures4[2] = {
1927 	[NFSPROC4_NULL] = {
1928 		.pc_func = (svc_procfunc) nfsd4_proc_null,
1929 		.pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1930 		.pc_argsize = sizeof(struct nfsd4_voidargs),
1931 		.pc_ressize = sizeof(struct nfsd4_voidres),
1932 		.pc_cachetype = RC_NOCACHE,
1933 		.pc_xdrressize = 1,
1934 	},
1935 	[NFSPROC4_COMPOUND] = {
1936 		.pc_func = (svc_procfunc) nfsd4_proc_compound,
1937 		.pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1938 		.pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1939 		.pc_argsize = sizeof(struct nfsd4_compoundargs),
1940 		.pc_ressize = sizeof(struct nfsd4_compoundres),
1941 		.pc_release = nfsd4_release_compoundargs,
1942 		.pc_cachetype = RC_NOCACHE,
1943 		.pc_xdrressize = NFSD_BUFSIZE/4,
1944 	},
1945 };
1946 
1947 struct svc_version	nfsd_version4 = {
1948 		.vs_vers	= 4,
1949 		.vs_nproc	= 2,
1950 		.vs_proc	= nfsd_procedures4,
1951 		.vs_dispatch	= nfsd_dispatch,
1952 		.vs_xdrsize	= NFS4_SVC_XDRSIZE,
1953 		.vs_rpcb_optnl	= 1,
1954 };
1955 
1956 /*
1957  * Local variables:
1958  *  c-basic-offset: 8
1959  * End:
1960  */
1961