xref: /openbmc/linux/fs/nfsd/nfs4proc.c (revision 4da722ca)
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/falloc.h>
37 #include <linux/slab.h>
38 
39 #include "idmap.h"
40 #include "cache.h"
41 #include "xdr4.h"
42 #include "vfs.h"
43 #include "current_stateid.h"
44 #include "netns.h"
45 #include "acl.h"
46 #include "pnfs.h"
47 #include "trace.h"
48 
49 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
50 #include <linux/security.h>
51 
52 static inline void
53 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
54 {
55 	struct inode *inode = d_inode(resfh->fh_dentry);
56 	int status;
57 
58 	inode_lock(inode);
59 	status = security_inode_setsecctx(resfh->fh_dentry,
60 		label->data, label->len);
61 	inode_unlock(inode);
62 
63 	if (status)
64 		/*
65 		 * XXX: We should really fail the whole open, but we may
66 		 * already have created a new file, so it may be too
67 		 * late.  For now this seems the least of evils:
68 		 */
69 		bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
70 
71 	return;
72 }
73 #else
74 static inline void
75 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
76 { }
77 #endif
78 
79 #define NFSDDBG_FACILITY		NFSDDBG_PROC
80 
81 static u32 nfsd_attrmask[] = {
82 	NFSD_WRITEABLE_ATTRS_WORD0,
83 	NFSD_WRITEABLE_ATTRS_WORD1,
84 	NFSD_WRITEABLE_ATTRS_WORD2
85 };
86 
87 static u32 nfsd41_ex_attrmask[] = {
88 	NFSD_SUPPATTR_EXCLCREAT_WORD0,
89 	NFSD_SUPPATTR_EXCLCREAT_WORD1,
90 	NFSD_SUPPATTR_EXCLCREAT_WORD2
91 };
92 
93 static __be32
94 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
95 		   u32 *bmval, u32 *writable)
96 {
97 	struct dentry *dentry = cstate->current_fh.fh_dentry;
98 	struct svc_export *exp = cstate->current_fh.fh_export;
99 
100 	if (!nfsd_attrs_supported(cstate->minorversion, bmval))
101 		return nfserr_attrnotsupp;
102 	if ((bmval[0] & FATTR4_WORD0_ACL) && !IS_POSIXACL(d_inode(dentry)))
103 		return nfserr_attrnotsupp;
104 	if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) &&
105 			!(exp->ex_flags & NFSEXP_SECURITY_LABEL))
106 		return nfserr_attrnotsupp;
107 	if (writable && !bmval_is_subset(bmval, writable))
108 		return nfserr_inval;
109 	if (writable && (bmval[2] & FATTR4_WORD2_MODE_UMASK) &&
110 			(bmval[1] & FATTR4_WORD1_MODE))
111 		return nfserr_inval;
112 	return nfs_ok;
113 }
114 
115 static __be32
116 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
117 	struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
118 {
119 	__be32 status = nfs_ok;
120 
121 	if (open->op_create == NFS4_OPEN_CREATE) {
122 		if (open->op_createmode == NFS4_CREATE_UNCHECKED
123 		    || open->op_createmode == NFS4_CREATE_GUARDED)
124 			status = check_attr_support(rqstp, cstate,
125 					open->op_bmval, nfsd_attrmask);
126 		else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
127 			status = check_attr_support(rqstp, cstate,
128 					open->op_bmval, nfsd41_ex_attrmask);
129 	}
130 
131 	return status;
132 }
133 
134 static int
135 is_create_with_attrs(struct nfsd4_open *open)
136 {
137 	return open->op_create == NFS4_OPEN_CREATE
138 		&& (open->op_createmode == NFS4_CREATE_UNCHECKED
139 		    || open->op_createmode == NFS4_CREATE_GUARDED
140 		    || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
141 }
142 
143 /*
144  * if error occurs when setting the acl, just clear the acl bit
145  * in the returned attr bitmap.
146  */
147 static void
148 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
149 		struct nfs4_acl *acl, u32 *bmval)
150 {
151 	__be32 status;
152 
153 	status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
154 	if (status)
155 		/*
156 		 * We should probably fail the whole open at this point,
157 		 * but we've already created the file, so it's too late;
158 		 * So this seems the least of evils:
159 		 */
160 		bmval[0] &= ~FATTR4_WORD0_ACL;
161 }
162 
163 static inline void
164 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
165 {
166 	fh_put(dst);
167 	dget(src->fh_dentry);
168 	if (src->fh_export)
169 		exp_get(src->fh_export);
170 	*dst = *src;
171 }
172 
173 static __be32
174 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
175 {
176 	__be32 status;
177 
178 	if (open->op_truncate &&
179 		!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
180 		return nfserr_inval;
181 
182 	accmode |= NFSD_MAY_READ_IF_EXEC;
183 
184 	if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
185 		accmode |= NFSD_MAY_READ;
186 	if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
187 		accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
188 	if (open->op_share_deny & NFS4_SHARE_DENY_READ)
189 		accmode |= NFSD_MAY_WRITE;
190 
191 	status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
192 
193 	return status;
194 }
195 
196 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
197 {
198 	umode_t mode = d_inode(fh->fh_dentry)->i_mode;
199 
200 	if (S_ISREG(mode))
201 		return nfs_ok;
202 	if (S_ISDIR(mode))
203 		return nfserr_isdir;
204 	/*
205 	 * Using err_symlink as our catch-all case may look odd; but
206 	 * there's no other obvious error for this case in 4.0, and we
207 	 * happen to know that it will cause the linux v4 client to do
208 	 * the right thing on attempts to open something other than a
209 	 * regular file.
210 	 */
211 	return nfserr_symlink;
212 }
213 
214 static void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh *resfh)
215 {
216 	if (nfsd4_has_session(cstate))
217 		return;
218 	fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
219 			&resfh->fh_handle);
220 }
221 
222 static __be32
223 do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh **resfh)
224 {
225 	struct svc_fh *current_fh = &cstate->current_fh;
226 	int accmode;
227 	__be32 status;
228 
229 	*resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
230 	if (!*resfh)
231 		return nfserr_jukebox;
232 	fh_init(*resfh, NFS4_FHSIZE);
233 	open->op_truncate = 0;
234 
235 	if (open->op_create) {
236 		/* FIXME: check session persistence and pnfs flags.
237 		 * The nfsv4.1 spec requires the following semantics:
238 		 *
239 		 * Persistent   | pNFS   | Server REQUIRED | Client Allowed
240 		 * Reply Cache  | server |                 |
241 		 * -------------+--------+-----------------+--------------------
242 		 * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
243 		 *              |        |                 | (SHOULD)
244 		 *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
245 		 *              |        |                 | (SHOULD NOT)
246 		 * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
247 		 * yes          | no     | GUARDED4        | GUARDED4
248 		 * yes          | yes    | GUARDED4        | GUARDED4
249 		 */
250 
251 		/*
252 		 * Note: create modes (UNCHECKED,GUARDED...) are the same
253 		 * in NFSv4 as in v3 except EXCLUSIVE4_1.
254 		 */
255 		status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
256 					open->op_fname.len, &open->op_iattr,
257 					*resfh, open->op_createmode,
258 					(u32 *)open->op_verf.data,
259 					&open->op_truncate, &open->op_created);
260 
261 		if (!status && open->op_label.len)
262 			nfsd4_security_inode_setsecctx(*resfh, &open->op_label, open->op_bmval);
263 
264 		/*
265 		 * Following rfc 3530 14.2.16, and rfc 5661 18.16.4
266 		 * use the returned bitmask to indicate which attributes
267 		 * we used to store the verifier:
268 		 */
269 		if (nfsd_create_is_exclusive(open->op_createmode) && status == 0)
270 			open->op_bmval[1] |= (FATTR4_WORD1_TIME_ACCESS |
271 						FATTR4_WORD1_TIME_MODIFY);
272 	} else
273 		/*
274 		 * Note this may exit with the parent still locked.
275 		 * We will hold the lock until nfsd4_open's final
276 		 * lookup, to prevent renames or unlinks until we've had
277 		 * a chance to an acquire a delegation if appropriate.
278 		 */
279 		status = nfsd_lookup(rqstp, current_fh,
280 				     open->op_fname.data, open->op_fname.len, *resfh);
281 	if (status)
282 		goto out;
283 	status = nfsd_check_obj_isreg(*resfh);
284 	if (status)
285 		goto out;
286 
287 	if (is_create_with_attrs(open) && open->op_acl != NULL)
288 		do_set_nfs4_acl(rqstp, *resfh, open->op_acl, open->op_bmval);
289 
290 	nfsd4_set_open_owner_reply_cache(cstate, open, *resfh);
291 	accmode = NFSD_MAY_NOP;
292 	if (open->op_created ||
293 			open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
294 		accmode |= NFSD_MAY_OWNER_OVERRIDE;
295 	status = do_open_permission(rqstp, *resfh, open, accmode);
296 	set_change_info(&open->op_cinfo, current_fh);
297 out:
298 	return status;
299 }
300 
301 static __be32
302 do_open_fhandle(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
303 {
304 	struct svc_fh *current_fh = &cstate->current_fh;
305 	__be32 status;
306 	int accmode = 0;
307 
308 	/* We don't know the target directory, and therefore can not
309 	* set the change info
310 	*/
311 
312 	memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
313 
314 	nfsd4_set_open_owner_reply_cache(cstate, open, current_fh);
315 
316 	open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
317 		(open->op_iattr.ia_size == 0);
318 	/*
319 	 * In the delegation case, the client is telling us about an
320 	 * open that it *already* performed locally, some time ago.  We
321 	 * should let it succeed now if possible.
322 	 *
323 	 * In the case of a CLAIM_FH open, on the other hand, the client
324 	 * may be counting on us to enforce permissions (the Linux 4.1
325 	 * client uses this for normal opens, for example).
326 	 */
327 	if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
328 		accmode = NFSD_MAY_OWNER_OVERRIDE;
329 
330 	status = do_open_permission(rqstp, current_fh, open, accmode);
331 
332 	return status;
333 }
334 
335 static void
336 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
337 {
338 	struct nfsd4_sessionid *sid =
339 			(struct nfsd4_sessionid *)session->se_sessionid.data;
340 
341 	clid->cl_boot = sid->clientid.cl_boot;
342 	clid->cl_id = sid->clientid.cl_id;
343 }
344 
345 static __be32
346 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
347 	   union nfsd4_op_u *u)
348 {
349 	struct nfsd4_open *open = &u->open;
350 	__be32 status;
351 	struct svc_fh *resfh = NULL;
352 	struct net *net = SVC_NET(rqstp);
353 	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
354 
355 	dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
356 		(int)open->op_fname.len, open->op_fname.data,
357 		open->op_openowner);
358 
359 	/* This check required by spec. */
360 	if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
361 		return nfserr_inval;
362 
363 	open->op_created = 0;
364 	/*
365 	 * RFC5661 18.51.3
366 	 * Before RECLAIM_COMPLETE done, server should deny new lock
367 	 */
368 	if (nfsd4_has_session(cstate) &&
369 	    !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
370 		      &cstate->session->se_client->cl_flags) &&
371 	    open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
372 		return nfserr_grace;
373 
374 	if (nfsd4_has_session(cstate))
375 		copy_clientid(&open->op_clientid, cstate->session);
376 
377 	/* check seqid for replay. set nfs4_owner */
378 	status = nfsd4_process_open1(cstate, open, nn);
379 	if (status == nfserr_replay_me) {
380 		struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
381 		fh_put(&cstate->current_fh);
382 		fh_copy_shallow(&cstate->current_fh.fh_handle,
383 				&rp->rp_openfh);
384 		status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
385 		if (status)
386 			dprintk("nfsd4_open: replay failed"
387 				" restoring previous filehandle\n");
388 		else
389 			status = nfserr_replay_me;
390 	}
391 	if (status)
392 		goto out;
393 	if (open->op_xdr_error) {
394 		status = open->op_xdr_error;
395 		goto out;
396 	}
397 
398 	status = nfsd4_check_open_attributes(rqstp, cstate, open);
399 	if (status)
400 		goto out;
401 
402 	/* Openowner is now set, so sequence id will get bumped.  Now we need
403 	 * these checks before we do any creates: */
404 	status = nfserr_grace;
405 	if (opens_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
406 		goto out;
407 	status = nfserr_no_grace;
408 	if (!opens_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
409 		goto out;
410 
411 	switch (open->op_claim_type) {
412 		case NFS4_OPEN_CLAIM_DELEGATE_CUR:
413 		case NFS4_OPEN_CLAIM_NULL:
414 			status = do_open_lookup(rqstp, cstate, open, &resfh);
415 			if (status)
416 				goto out;
417 			break;
418 		case NFS4_OPEN_CLAIM_PREVIOUS:
419 			status = nfs4_check_open_reclaim(&open->op_clientid,
420 							 cstate, nn);
421 			if (status)
422 				goto out;
423 			open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
424 		case NFS4_OPEN_CLAIM_FH:
425 		case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
426 			status = do_open_fhandle(rqstp, cstate, open);
427 			if (status)
428 				goto out;
429 			resfh = &cstate->current_fh;
430 			break;
431 		case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
432              	case NFS4_OPEN_CLAIM_DELEGATE_PREV:
433 			dprintk("NFSD: unsupported OPEN claim type %d\n",
434 				open->op_claim_type);
435 			status = nfserr_notsupp;
436 			goto out;
437 		default:
438 			dprintk("NFSD: Invalid OPEN claim type %d\n",
439 				open->op_claim_type);
440 			status = nfserr_inval;
441 			goto out;
442 	}
443 	/*
444 	 * nfsd4_process_open2() does the actual opening of the file.  If
445 	 * successful, it (1) truncates the file if open->op_truncate was
446 	 * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
447 	 */
448 	status = nfsd4_process_open2(rqstp, resfh, open);
449 	WARN(status && open->op_created,
450 	     "nfsd4_process_open2 failed to open newly-created file! status=%u\n",
451 	     be32_to_cpu(status));
452 out:
453 	if (resfh && resfh != &cstate->current_fh) {
454 		fh_dup2(&cstate->current_fh, resfh);
455 		fh_put(resfh);
456 		kfree(resfh);
457 	}
458 	nfsd4_cleanup_open_state(cstate, open);
459 	nfsd4_bump_seqid(cstate, status);
460 	return status;
461 }
462 
463 /*
464  * OPEN is the only seqid-mutating operation whose decoding can fail
465  * with a seqid-mutating error (specifically, decoding of user names in
466  * the attributes).  Therefore we have to do some processing to look up
467  * the stateowner so that we can bump the seqid.
468  */
469 static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
470 {
471 	struct nfsd4_open *open = &op->u.open;
472 
473 	if (!seqid_mutating_err(ntohl(op->status)))
474 		return op->status;
475 	if (nfsd4_has_session(cstate))
476 		return op->status;
477 	open->op_xdr_error = op->status;
478 	return nfsd4_open(rqstp, cstate, &op->u);
479 }
480 
481 /*
482  * filehandle-manipulating ops.
483  */
484 static __be32
485 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
486 	    union nfsd4_op_u *u)
487 {
488 	if (!cstate->current_fh.fh_dentry)
489 		return nfserr_nofilehandle;
490 
491 	u->getfh = &cstate->current_fh;
492 	return nfs_ok;
493 }
494 
495 static __be32
496 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
497 	    union nfsd4_op_u *u)
498 {
499 	struct nfsd4_putfh *putfh = &u->putfh;
500 
501 	fh_put(&cstate->current_fh);
502 	cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
503 	memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
504 	       putfh->pf_fhlen);
505 	return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
506 }
507 
508 static __be32
509 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
510 		union nfsd4_op_u *u)
511 {
512 	__be32 status;
513 
514 	fh_put(&cstate->current_fh);
515 	status = exp_pseudoroot(rqstp, &cstate->current_fh);
516 	return status;
517 }
518 
519 static __be32
520 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
521 		union nfsd4_op_u *u)
522 {
523 	if (!cstate->save_fh.fh_dentry)
524 		return nfserr_restorefh;
525 
526 	fh_dup2(&cstate->current_fh, &cstate->save_fh);
527 	if (HAS_STATE_ID(cstate, SAVED_STATE_ID_FLAG)) {
528 		memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
529 		SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
530 	}
531 	return nfs_ok;
532 }
533 
534 static __be32
535 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
536 	     union nfsd4_op_u *u)
537 {
538 	if (!cstate->current_fh.fh_dentry)
539 		return nfserr_nofilehandle;
540 
541 	fh_dup2(&cstate->save_fh, &cstate->current_fh);
542 	if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
543 		memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
544 		SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG);
545 	}
546 	return nfs_ok;
547 }
548 
549 /*
550  * misc nfsv4 ops
551  */
552 static __be32
553 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
554 	     union nfsd4_op_u *u)
555 {
556 	struct nfsd4_access *access = &u->access;
557 
558 	if (access->ac_req_access & ~NFS3_ACCESS_FULL)
559 		return nfserr_inval;
560 
561 	access->ac_resp_access = access->ac_req_access;
562 	return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
563 			   &access->ac_supported);
564 }
565 
566 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
567 {
568 	__be32 verf[2];
569 	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
570 
571 	/*
572 	 * This is opaque to client, so no need to byte-swap. Use
573 	 * __force to keep sparse happy
574 	 */
575 	verf[0] = (__force __be32)nn->nfssvc_boot.tv_sec;
576 	verf[1] = (__force __be32)nn->nfssvc_boot.tv_usec;
577 	memcpy(verifier->data, verf, sizeof(verifier->data));
578 }
579 
580 static __be32
581 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
582 	     union nfsd4_op_u *u)
583 {
584 	struct nfsd4_commit *commit = &u->commit;
585 
586 	gen_boot_verifier(&commit->co_verf, SVC_NET(rqstp));
587 	return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
588 			     commit->co_count);
589 }
590 
591 static __be32
592 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
593 	     union nfsd4_op_u *u)
594 {
595 	struct nfsd4_create *create = &u->create;
596 	struct svc_fh resfh;
597 	__be32 status;
598 	dev_t rdev;
599 
600 	fh_init(&resfh, NFS4_FHSIZE);
601 
602 	status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_NOP);
603 	if (status)
604 		return status;
605 
606 	status = check_attr_support(rqstp, cstate, create->cr_bmval,
607 				    nfsd_attrmask);
608 	if (status)
609 		return status;
610 
611 	switch (create->cr_type) {
612 	case NF4LNK:
613 		status = nfsd_symlink(rqstp, &cstate->current_fh,
614 				      create->cr_name, create->cr_namelen,
615 				      create->cr_data, &resfh);
616 		break;
617 
618 	case NF4BLK:
619 		rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
620 		if (MAJOR(rdev) != create->cr_specdata1 ||
621 		    MINOR(rdev) != create->cr_specdata2)
622 			return nfserr_inval;
623 		status = nfsd_create(rqstp, &cstate->current_fh,
624 				     create->cr_name, create->cr_namelen,
625 				     &create->cr_iattr, S_IFBLK, rdev, &resfh);
626 		break;
627 
628 	case NF4CHR:
629 		rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
630 		if (MAJOR(rdev) != create->cr_specdata1 ||
631 		    MINOR(rdev) != create->cr_specdata2)
632 			return nfserr_inval;
633 		status = nfsd_create(rqstp, &cstate->current_fh,
634 				     create->cr_name, create->cr_namelen,
635 				     &create->cr_iattr,S_IFCHR, rdev, &resfh);
636 		break;
637 
638 	case NF4SOCK:
639 		status = nfsd_create(rqstp, &cstate->current_fh,
640 				     create->cr_name, create->cr_namelen,
641 				     &create->cr_iattr, S_IFSOCK, 0, &resfh);
642 		break;
643 
644 	case NF4FIFO:
645 		status = nfsd_create(rqstp, &cstate->current_fh,
646 				     create->cr_name, create->cr_namelen,
647 				     &create->cr_iattr, S_IFIFO, 0, &resfh);
648 		break;
649 
650 	case NF4DIR:
651 		create->cr_iattr.ia_valid &= ~ATTR_SIZE;
652 		status = nfsd_create(rqstp, &cstate->current_fh,
653 				     create->cr_name, create->cr_namelen,
654 				     &create->cr_iattr, S_IFDIR, 0, &resfh);
655 		break;
656 
657 	default:
658 		status = nfserr_badtype;
659 	}
660 
661 	if (status)
662 		goto out;
663 
664 	if (create->cr_label.len)
665 		nfsd4_security_inode_setsecctx(&resfh, &create->cr_label, create->cr_bmval);
666 
667 	if (create->cr_acl != NULL)
668 		do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
669 				create->cr_bmval);
670 
671 	fh_unlock(&cstate->current_fh);
672 	set_change_info(&create->cr_cinfo, &cstate->current_fh);
673 	fh_dup2(&cstate->current_fh, &resfh);
674 out:
675 	fh_put(&resfh);
676 	return status;
677 }
678 
679 static __be32
680 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
681 	      union nfsd4_op_u *u)
682 {
683 	struct nfsd4_getattr *getattr = &u->getattr;
684 	__be32 status;
685 
686 	status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
687 	if (status)
688 		return status;
689 
690 	if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
691 		return nfserr_inval;
692 
693 	getattr->ga_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
694 	getattr->ga_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
695 	getattr->ga_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
696 
697 	getattr->ga_fhp = &cstate->current_fh;
698 	return nfs_ok;
699 }
700 
701 static __be32
702 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
703 	   union nfsd4_op_u *u)
704 {
705 	struct nfsd4_link *link = &u->link;
706 	__be32 status = nfserr_nofilehandle;
707 
708 	if (!cstate->save_fh.fh_dentry)
709 		return status;
710 	status = nfsd_link(rqstp, &cstate->current_fh,
711 			   link->li_name, link->li_namelen, &cstate->save_fh);
712 	if (!status)
713 		set_change_info(&link->li_cinfo, &cstate->current_fh);
714 	return status;
715 }
716 
717 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
718 {
719 	struct svc_fh tmp_fh;
720 	__be32 ret;
721 
722 	fh_init(&tmp_fh, NFS4_FHSIZE);
723 	ret = exp_pseudoroot(rqstp, &tmp_fh);
724 	if (ret)
725 		return ret;
726 	if (tmp_fh.fh_dentry == fh->fh_dentry) {
727 		fh_put(&tmp_fh);
728 		return nfserr_noent;
729 	}
730 	fh_put(&tmp_fh);
731 	return nfsd_lookup(rqstp, fh, "..", 2, fh);
732 }
733 
734 static __be32
735 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
736 	      union nfsd4_op_u *u)
737 {
738 	return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
739 }
740 
741 static __be32
742 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
743 	     union nfsd4_op_u *u)
744 {
745 	return nfsd_lookup(rqstp, &cstate->current_fh,
746 			   u->lookup.lo_name, u->lookup.lo_len,
747 			   &cstate->current_fh);
748 }
749 
750 static __be32
751 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
752 	   union nfsd4_op_u *u)
753 {
754 	struct nfsd4_read *read = &u->read;
755 	__be32 status;
756 
757 	read->rd_filp = NULL;
758 	if (read->rd_offset >= OFFSET_MAX)
759 		return nfserr_inval;
760 
761 	/*
762 	 * If we do a zero copy read, then a client will see read data
763 	 * that reflects the state of the file *after* performing the
764 	 * following compound.
765 	 *
766 	 * To ensure proper ordering, we therefore turn off zero copy if
767 	 * the client wants us to do more in this compound:
768 	 */
769 	if (!nfsd4_last_compound_op(rqstp))
770 		clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
771 
772 	/* check stateid */
773 	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
774 					&read->rd_stateid, RD_STATE,
775 					&read->rd_filp, &read->rd_tmp_file);
776 	if (status) {
777 		dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
778 		goto out;
779 	}
780 	status = nfs_ok;
781 out:
782 	read->rd_rqstp = rqstp;
783 	read->rd_fhp = &cstate->current_fh;
784 	return status;
785 }
786 
787 static __be32
788 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
789 	      union nfsd4_op_u *u)
790 {
791 	struct nfsd4_readdir *readdir = &u->readdir;
792 	u64 cookie = readdir->rd_cookie;
793 	static const nfs4_verifier zeroverf;
794 
795 	/* no need to check permission - this will be done in nfsd_readdir() */
796 
797 	if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
798 		return nfserr_inval;
799 
800 	readdir->rd_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
801 	readdir->rd_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
802 	readdir->rd_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
803 
804 	if ((cookie == 1) || (cookie == 2) ||
805 	    (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
806 		return nfserr_bad_cookie;
807 
808 	readdir->rd_rqstp = rqstp;
809 	readdir->rd_fhp = &cstate->current_fh;
810 	return nfs_ok;
811 }
812 
813 static __be32
814 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
815 	       union nfsd4_op_u *u)
816 {
817 	u->readlink.rl_rqstp = rqstp;
818 	u->readlink.rl_fhp = &cstate->current_fh;
819 	return nfs_ok;
820 }
821 
822 static __be32
823 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
824 	     union nfsd4_op_u *u)
825 {
826 	struct nfsd4_remove *remove = &u->remove;
827 	__be32 status;
828 
829 	if (opens_in_grace(SVC_NET(rqstp)))
830 		return nfserr_grace;
831 	status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
832 			     remove->rm_name, remove->rm_namelen);
833 	if (!status) {
834 		fh_unlock(&cstate->current_fh);
835 		set_change_info(&remove->rm_cinfo, &cstate->current_fh);
836 	}
837 	return status;
838 }
839 
840 static __be32
841 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
842 	     union nfsd4_op_u *u)
843 {
844 	struct nfsd4_rename *rename = &u->rename;
845 	__be32 status = nfserr_nofilehandle;
846 
847 	if (!cstate->save_fh.fh_dentry)
848 		return status;
849 	if (opens_in_grace(SVC_NET(rqstp)) &&
850 		!(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
851 		return nfserr_grace;
852 	status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
853 			     rename->rn_snamelen, &cstate->current_fh,
854 			     rename->rn_tname, rename->rn_tnamelen);
855 	if (status)
856 		return status;
857 	set_change_info(&rename->rn_sinfo, &cstate->current_fh);
858 	set_change_info(&rename->rn_tinfo, &cstate->save_fh);
859 	return nfs_ok;
860 }
861 
862 static __be32
863 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
864 	      union nfsd4_op_u *u)
865 {
866 	struct nfsd4_secinfo *secinfo = &u->secinfo;
867 	struct svc_export *exp;
868 	struct dentry *dentry;
869 	__be32 err;
870 
871 	err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
872 	if (err)
873 		return err;
874 	err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
875 				    secinfo->si_name, secinfo->si_namelen,
876 				    &exp, &dentry);
877 	if (err)
878 		return err;
879 	fh_unlock(&cstate->current_fh);
880 	if (d_really_is_negative(dentry)) {
881 		exp_put(exp);
882 		err = nfserr_noent;
883 	} else
884 		secinfo->si_exp = exp;
885 	dput(dentry);
886 	if (cstate->minorversion)
887 		/* See rfc 5661 section 2.6.3.1.1.8 */
888 		fh_put(&cstate->current_fh);
889 	return err;
890 }
891 
892 static __be32
893 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
894 		union nfsd4_op_u *u)
895 {
896 	__be32 err;
897 
898 	switch (u->secinfo_no_name.sin_style) {
899 	case NFS4_SECINFO_STYLE4_CURRENT_FH:
900 		break;
901 	case NFS4_SECINFO_STYLE4_PARENT:
902 		err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
903 		if (err)
904 			return err;
905 		break;
906 	default:
907 		return nfserr_inval;
908 	}
909 
910 	u->secinfo_no_name.sin_exp = exp_get(cstate->current_fh.fh_export);
911 	fh_put(&cstate->current_fh);
912 	return nfs_ok;
913 }
914 
915 static __be32
916 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
917 	      union nfsd4_op_u *u)
918 {
919 	struct nfsd4_setattr *setattr = &u->setattr;
920 	__be32 status = nfs_ok;
921 	int err;
922 
923 	if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
924 		status = nfs4_preprocess_stateid_op(rqstp, cstate,
925 				&cstate->current_fh, &setattr->sa_stateid,
926 				WR_STATE, NULL, NULL);
927 		if (status) {
928 			dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
929 			return status;
930 		}
931 	}
932 	err = fh_want_write(&cstate->current_fh);
933 	if (err)
934 		return nfserrno(err);
935 	status = nfs_ok;
936 
937 	status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
938 				    nfsd_attrmask);
939 	if (status)
940 		goto out;
941 
942 	if (setattr->sa_acl != NULL)
943 		status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
944 					    setattr->sa_acl);
945 	if (status)
946 		goto out;
947 	if (setattr->sa_label.len)
948 		status = nfsd4_set_nfs4_label(rqstp, &cstate->current_fh,
949 				&setattr->sa_label);
950 	if (status)
951 		goto out;
952 	status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
953 				0, (time_t)0);
954 out:
955 	fh_drop_write(&cstate->current_fh);
956 	return status;
957 }
958 
959 static int fill_in_write_vector(struct kvec *vec, struct nfsd4_write *write)
960 {
961         int i = 1;
962         int buflen = write->wr_buflen;
963 
964         vec[0].iov_base = write->wr_head.iov_base;
965         vec[0].iov_len = min_t(int, buflen, write->wr_head.iov_len);
966         buflen -= vec[0].iov_len;
967 
968         while (buflen) {
969                 vec[i].iov_base = page_address(write->wr_pagelist[i - 1]);
970                 vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
971                 buflen -= vec[i].iov_len;
972                 i++;
973         }
974         return i;
975 }
976 
977 static __be32
978 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
979 	    union nfsd4_op_u *u)
980 {
981 	struct nfsd4_write *write = &u->write;
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 	if (write->wr_offset >= OFFSET_MAX)
989 		return nfserr_inval;
990 
991 	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
992 						stateid, WR_STATE, &filp, NULL);
993 	if (status) {
994 		dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
995 		return status;
996 	}
997 
998 	cnt = write->wr_buflen;
999 	write->wr_how_written = write->wr_stable_how;
1000 	gen_boot_verifier(&write->wr_verifier, SVC_NET(rqstp));
1001 
1002 	nvecs = fill_in_write_vector(rqstp->rq_vec, write);
1003 	WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1004 
1005 	status = nfsd_vfs_write(rqstp, &cstate->current_fh, filp,
1006 				write->wr_offset, rqstp->rq_vec, nvecs, &cnt,
1007 				write->wr_how_written);
1008 	fput(filp);
1009 
1010 	write->wr_bytes_written = cnt;
1011 
1012 	return status;
1013 }
1014 
1015 static __be32
1016 nfsd4_verify_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1017 		  stateid_t *src_stateid, struct file **src,
1018 		  stateid_t *dst_stateid, struct file **dst)
1019 {
1020 	__be32 status;
1021 
1022 	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->save_fh,
1023 					    src_stateid, RD_STATE, src, NULL);
1024 	if (status) {
1025 		dprintk("NFSD: %s: couldn't process src stateid!\n", __func__);
1026 		goto out;
1027 	}
1028 
1029 	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1030 					    dst_stateid, WR_STATE, dst, NULL);
1031 	if (status) {
1032 		dprintk("NFSD: %s: couldn't process dst stateid!\n", __func__);
1033 		goto out_put_src;
1034 	}
1035 
1036 	/* fix up for NFS-specific error code */
1037 	if (!S_ISREG(file_inode(*src)->i_mode) ||
1038 	    !S_ISREG(file_inode(*dst)->i_mode)) {
1039 		status = nfserr_wrong_type;
1040 		goto out_put_dst;
1041 	}
1042 
1043 out:
1044 	return status;
1045 out_put_dst:
1046 	fput(*dst);
1047 out_put_src:
1048 	fput(*src);
1049 	goto out;
1050 }
1051 
1052 static __be32
1053 nfsd4_clone(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1054 		union nfsd4_op_u *u)
1055 {
1056 	struct nfsd4_clone *clone = &u->clone;
1057 	struct file *src, *dst;
1058 	__be32 status;
1059 
1060 	status = nfsd4_verify_copy(rqstp, cstate, &clone->cl_src_stateid, &src,
1061 				   &clone->cl_dst_stateid, &dst);
1062 	if (status)
1063 		goto out;
1064 
1065 	status = nfsd4_clone_file_range(src, clone->cl_src_pos,
1066 			dst, clone->cl_dst_pos, clone->cl_count);
1067 
1068 	fput(dst);
1069 	fput(src);
1070 out:
1071 	return status;
1072 }
1073 
1074 static __be32
1075 nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1076 		union nfsd4_op_u *u)
1077 {
1078 	struct nfsd4_copy *copy = &u->copy;
1079 	struct file *src, *dst;
1080 	__be32 status;
1081 	ssize_t bytes;
1082 
1083 	status = nfsd4_verify_copy(rqstp, cstate, &copy->cp_src_stateid, &src,
1084 				   &copy->cp_dst_stateid, &dst);
1085 	if (status)
1086 		goto out;
1087 
1088 	bytes = nfsd_copy_file_range(src, copy->cp_src_pos,
1089 			dst, copy->cp_dst_pos, copy->cp_count);
1090 
1091 	if (bytes < 0)
1092 		status = nfserrno(bytes);
1093 	else {
1094 		copy->cp_res.wr_bytes_written = bytes;
1095 		copy->cp_res.wr_stable_how = NFS_UNSTABLE;
1096 		copy->cp_consecutive = 1;
1097 		copy->cp_synchronous = 1;
1098 		gen_boot_verifier(&copy->cp_res.wr_verifier, SVC_NET(rqstp));
1099 		status = nfs_ok;
1100 	}
1101 
1102 	fput(src);
1103 	fput(dst);
1104 out:
1105 	return status;
1106 }
1107 
1108 static __be32
1109 nfsd4_fallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1110 		struct nfsd4_fallocate *fallocate, int flags)
1111 {
1112 	__be32 status = nfserr_notsupp;
1113 	struct file *file;
1114 
1115 	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1116 					    &fallocate->falloc_stateid,
1117 					    WR_STATE, &file, NULL);
1118 	if (status != nfs_ok) {
1119 		dprintk("NFSD: nfsd4_fallocate: couldn't process stateid!\n");
1120 		return status;
1121 	}
1122 
1123 	status = nfsd4_vfs_fallocate(rqstp, &cstate->current_fh, file,
1124 				     fallocate->falloc_offset,
1125 				     fallocate->falloc_length,
1126 				     flags);
1127 	fput(file);
1128 	return status;
1129 }
1130 
1131 static __be32
1132 nfsd4_allocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1133 	       union nfsd4_op_u *u)
1134 {
1135 	return nfsd4_fallocate(rqstp, cstate, &u->allocate, 0);
1136 }
1137 
1138 static __be32
1139 nfsd4_deallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1140 		 union nfsd4_op_u *u)
1141 {
1142 	return nfsd4_fallocate(rqstp, cstate, &u->deallocate,
1143 			       FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE);
1144 }
1145 
1146 static __be32
1147 nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1148 	   union nfsd4_op_u *u)
1149 {
1150 	struct nfsd4_seek *seek = &u->seek;
1151 	int whence;
1152 	__be32 status;
1153 	struct file *file;
1154 
1155 	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1156 					    &seek->seek_stateid,
1157 					    RD_STATE, &file, NULL);
1158 	if (status) {
1159 		dprintk("NFSD: nfsd4_seek: couldn't process stateid!\n");
1160 		return status;
1161 	}
1162 
1163 	switch (seek->seek_whence) {
1164 	case NFS4_CONTENT_DATA:
1165 		whence = SEEK_DATA;
1166 		break;
1167 	case NFS4_CONTENT_HOLE:
1168 		whence = SEEK_HOLE;
1169 		break;
1170 	default:
1171 		status = nfserr_union_notsupp;
1172 		goto out;
1173 	}
1174 
1175 	/*
1176 	 * Note:  This call does change file->f_pos, but nothing in NFSD
1177 	 *        should ever file->f_pos.
1178 	 */
1179 	seek->seek_pos = vfs_llseek(file, seek->seek_offset, whence);
1180 	if (seek->seek_pos < 0)
1181 		status = nfserrno(seek->seek_pos);
1182 	else if (seek->seek_pos >= i_size_read(file_inode(file)))
1183 		seek->seek_eof = true;
1184 
1185 out:
1186 	fput(file);
1187 	return status;
1188 }
1189 
1190 /* This routine never returns NFS_OK!  If there are no other errors, it
1191  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
1192  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
1193  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
1194  */
1195 static __be32
1196 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1197 	     struct nfsd4_verify *verify)
1198 {
1199 	__be32 *buf, *p;
1200 	int count;
1201 	__be32 status;
1202 
1203 	status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
1204 	if (status)
1205 		return status;
1206 
1207 	status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
1208 	if (status)
1209 		return status;
1210 
1211 	if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1212 	    || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1213 		return nfserr_inval;
1214 	if (verify->ve_attrlen & 3)
1215 		return nfserr_inval;
1216 
1217 	/* count in words:
1218 	 *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1219 	 */
1220 	count = 4 + (verify->ve_attrlen >> 2);
1221 	buf = kmalloc(count << 2, GFP_KERNEL);
1222 	if (!buf)
1223 		return nfserr_jukebox;
1224 
1225 	p = buf;
1226 	status = nfsd4_encode_fattr_to_buf(&p, count, &cstate->current_fh,
1227 				    cstate->current_fh.fh_export,
1228 				    cstate->current_fh.fh_dentry,
1229 				    verify->ve_bmval,
1230 				    rqstp, 0);
1231 	/*
1232 	 * If nfsd4_encode_fattr() ran out of space, assume that's because
1233 	 * the attributes are longer (hence different) than those given:
1234 	 */
1235 	if (status == nfserr_resource)
1236 		status = nfserr_not_same;
1237 	if (status)
1238 		goto out_kfree;
1239 
1240 	/* skip bitmap */
1241 	p = buf + 1 + ntohl(buf[0]);
1242 	status = nfserr_not_same;
1243 	if (ntohl(*p++) != verify->ve_attrlen)
1244 		goto out_kfree;
1245 	if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1246 		status = nfserr_same;
1247 
1248 out_kfree:
1249 	kfree(buf);
1250 	return status;
1251 }
1252 
1253 static __be32
1254 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1255 	      union nfsd4_op_u *u)
1256 {
1257 	__be32 status;
1258 
1259 	status = _nfsd4_verify(rqstp, cstate, &u->verify);
1260 	return status == nfserr_not_same ? nfs_ok : status;
1261 }
1262 
1263 static __be32
1264 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1265 	     union nfsd4_op_u *u)
1266 {
1267 	__be32 status;
1268 
1269 	status = _nfsd4_verify(rqstp, cstate, &u->nverify);
1270 	return status == nfserr_same ? nfs_ok : status;
1271 }
1272 
1273 #ifdef CONFIG_NFSD_PNFS
1274 static const struct nfsd4_layout_ops *
1275 nfsd4_layout_verify(struct svc_export *exp, unsigned int layout_type)
1276 {
1277 	if (!exp->ex_layout_types) {
1278 		dprintk("%s: export does not support pNFS\n", __func__);
1279 		return NULL;
1280 	}
1281 
1282 	if (layout_type >= LAYOUT_TYPE_MAX ||
1283 	    !(exp->ex_layout_types & (1 << layout_type))) {
1284 		dprintk("%s: layout type %d not supported\n",
1285 			__func__, layout_type);
1286 		return NULL;
1287 	}
1288 
1289 	return nfsd4_layout_ops[layout_type];
1290 }
1291 
1292 static __be32
1293 nfsd4_getdeviceinfo(struct svc_rqst *rqstp,
1294 		struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1295 {
1296 	struct nfsd4_getdeviceinfo *gdp = &u->getdeviceinfo;
1297 	const struct nfsd4_layout_ops *ops;
1298 	struct nfsd4_deviceid_map *map;
1299 	struct svc_export *exp;
1300 	__be32 nfserr;
1301 
1302 	dprintk("%s: layout_type %u dev_id [0x%llx:0x%x] maxcnt %u\n",
1303 	       __func__,
1304 	       gdp->gd_layout_type,
1305 	       gdp->gd_devid.fsid_idx, gdp->gd_devid.generation,
1306 	       gdp->gd_maxcount);
1307 
1308 	map = nfsd4_find_devid_map(gdp->gd_devid.fsid_idx);
1309 	if (!map) {
1310 		dprintk("%s: couldn't find device ID to export mapping!\n",
1311 			__func__);
1312 		return nfserr_noent;
1313 	}
1314 
1315 	exp = rqst_exp_find(rqstp, map->fsid_type, map->fsid);
1316 	if (IS_ERR(exp)) {
1317 		dprintk("%s: could not find device id\n", __func__);
1318 		return nfserr_noent;
1319 	}
1320 
1321 	nfserr = nfserr_layoutunavailable;
1322 	ops = nfsd4_layout_verify(exp, gdp->gd_layout_type);
1323 	if (!ops)
1324 		goto out;
1325 
1326 	nfserr = nfs_ok;
1327 	if (gdp->gd_maxcount != 0) {
1328 		nfserr = ops->proc_getdeviceinfo(exp->ex_path.mnt->mnt_sb,
1329 				rqstp, cstate->session->se_client, gdp);
1330 	}
1331 
1332 	gdp->gd_notify_types &= ops->notify_types;
1333 out:
1334 	exp_put(exp);
1335 	return nfserr;
1336 }
1337 
1338 static __be32
1339 nfsd4_layoutget(struct svc_rqst *rqstp,
1340 		struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1341 {
1342 	struct nfsd4_layoutget *lgp = &u->layoutget;
1343 	struct svc_fh *current_fh = &cstate->current_fh;
1344 	const struct nfsd4_layout_ops *ops;
1345 	struct nfs4_layout_stateid *ls;
1346 	__be32 nfserr;
1347 	int accmode;
1348 
1349 	switch (lgp->lg_seg.iomode) {
1350 	case IOMODE_READ:
1351 		accmode = NFSD_MAY_READ;
1352 		break;
1353 	case IOMODE_RW:
1354 		accmode = NFSD_MAY_READ | NFSD_MAY_WRITE;
1355 		break;
1356 	default:
1357 		dprintk("%s: invalid iomode %d\n",
1358 			__func__, lgp->lg_seg.iomode);
1359 		nfserr = nfserr_badiomode;
1360 		goto out;
1361 	}
1362 
1363 	nfserr = fh_verify(rqstp, current_fh, 0, accmode);
1364 	if (nfserr)
1365 		goto out;
1366 
1367 	nfserr = nfserr_layoutunavailable;
1368 	ops = nfsd4_layout_verify(current_fh->fh_export, lgp->lg_layout_type);
1369 	if (!ops)
1370 		goto out;
1371 
1372 	/*
1373 	 * Verify minlength and range as per RFC5661:
1374 	 *  o  If loga_length is less than loga_minlength,
1375 	 *     the metadata server MUST return NFS4ERR_INVAL.
1376 	 *  o  If the sum of loga_offset and loga_minlength exceeds
1377 	 *     NFS4_UINT64_MAX, and loga_minlength is not
1378 	 *     NFS4_UINT64_MAX, the error NFS4ERR_INVAL MUST result.
1379 	 *  o  If the sum of loga_offset and loga_length exceeds
1380 	 *     NFS4_UINT64_MAX, and loga_length is not NFS4_UINT64_MAX,
1381 	 *     the error NFS4ERR_INVAL MUST result.
1382 	 */
1383 	nfserr = nfserr_inval;
1384 	if (lgp->lg_seg.length < lgp->lg_minlength ||
1385 	    (lgp->lg_minlength != NFS4_MAX_UINT64 &&
1386 	     lgp->lg_minlength > NFS4_MAX_UINT64 - lgp->lg_seg.offset) ||
1387 	    (lgp->lg_seg.length != NFS4_MAX_UINT64 &&
1388 	     lgp->lg_seg.length > NFS4_MAX_UINT64 - lgp->lg_seg.offset))
1389 		goto out;
1390 	if (lgp->lg_seg.length == 0)
1391 		goto out;
1392 
1393 	nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lgp->lg_sid,
1394 						true, lgp->lg_layout_type, &ls);
1395 	if (nfserr) {
1396 		trace_layout_get_lookup_fail(&lgp->lg_sid);
1397 		goto out;
1398 	}
1399 
1400 	nfserr = nfserr_recallconflict;
1401 	if (atomic_read(&ls->ls_stid.sc_file->fi_lo_recalls))
1402 		goto out_put_stid;
1403 
1404 	nfserr = ops->proc_layoutget(d_inode(current_fh->fh_dentry),
1405 				     current_fh, lgp);
1406 	if (nfserr)
1407 		goto out_put_stid;
1408 
1409 	nfserr = nfsd4_insert_layout(lgp, ls);
1410 
1411 out_put_stid:
1412 	mutex_unlock(&ls->ls_mutex);
1413 	nfs4_put_stid(&ls->ls_stid);
1414 out:
1415 	return nfserr;
1416 }
1417 
1418 static __be32
1419 nfsd4_layoutcommit(struct svc_rqst *rqstp,
1420 		struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1421 {
1422 	struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
1423 	const struct nfsd4_layout_seg *seg = &lcp->lc_seg;
1424 	struct svc_fh *current_fh = &cstate->current_fh;
1425 	const struct nfsd4_layout_ops *ops;
1426 	loff_t new_size = lcp->lc_last_wr + 1;
1427 	struct inode *inode;
1428 	struct nfs4_layout_stateid *ls;
1429 	__be32 nfserr;
1430 
1431 	nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_WRITE);
1432 	if (nfserr)
1433 		goto out;
1434 
1435 	nfserr = nfserr_layoutunavailable;
1436 	ops = nfsd4_layout_verify(current_fh->fh_export, lcp->lc_layout_type);
1437 	if (!ops)
1438 		goto out;
1439 	inode = d_inode(current_fh->fh_dentry);
1440 
1441 	nfserr = nfserr_inval;
1442 	if (new_size <= seg->offset) {
1443 		dprintk("pnfsd: last write before layout segment\n");
1444 		goto out;
1445 	}
1446 	if (new_size > seg->offset + seg->length) {
1447 		dprintk("pnfsd: last write beyond layout segment\n");
1448 		goto out;
1449 	}
1450 	if (!lcp->lc_newoffset && new_size > i_size_read(inode)) {
1451 		dprintk("pnfsd: layoutcommit beyond EOF\n");
1452 		goto out;
1453 	}
1454 
1455 	nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lcp->lc_sid,
1456 						false, lcp->lc_layout_type,
1457 						&ls);
1458 	if (nfserr) {
1459 		trace_layout_commit_lookup_fail(&lcp->lc_sid);
1460 		/* fixup error code as per RFC5661 */
1461 		if (nfserr == nfserr_bad_stateid)
1462 			nfserr = nfserr_badlayout;
1463 		goto out;
1464 	}
1465 
1466 	/* LAYOUTCOMMIT does not require any serialization */
1467 	mutex_unlock(&ls->ls_mutex);
1468 
1469 	if (new_size > i_size_read(inode)) {
1470 		lcp->lc_size_chg = 1;
1471 		lcp->lc_newsize = new_size;
1472 	} else {
1473 		lcp->lc_size_chg = 0;
1474 	}
1475 
1476 	nfserr = ops->proc_layoutcommit(inode, lcp);
1477 	nfs4_put_stid(&ls->ls_stid);
1478 out:
1479 	return nfserr;
1480 }
1481 
1482 static __be32
1483 nfsd4_layoutreturn(struct svc_rqst *rqstp,
1484 		struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1485 {
1486 	struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
1487 	struct svc_fh *current_fh = &cstate->current_fh;
1488 	__be32 nfserr;
1489 
1490 	nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_NOP);
1491 	if (nfserr)
1492 		goto out;
1493 
1494 	nfserr = nfserr_layoutunavailable;
1495 	if (!nfsd4_layout_verify(current_fh->fh_export, lrp->lr_layout_type))
1496 		goto out;
1497 
1498 	switch (lrp->lr_seg.iomode) {
1499 	case IOMODE_READ:
1500 	case IOMODE_RW:
1501 	case IOMODE_ANY:
1502 		break;
1503 	default:
1504 		dprintk("%s: invalid iomode %d\n", __func__,
1505 			lrp->lr_seg.iomode);
1506 		nfserr = nfserr_inval;
1507 		goto out;
1508 	}
1509 
1510 	switch (lrp->lr_return_type) {
1511 	case RETURN_FILE:
1512 		nfserr = nfsd4_return_file_layouts(rqstp, cstate, lrp);
1513 		break;
1514 	case RETURN_FSID:
1515 	case RETURN_ALL:
1516 		nfserr = nfsd4_return_client_layouts(rqstp, cstate, lrp);
1517 		break;
1518 	default:
1519 		dprintk("%s: invalid return_type %d\n", __func__,
1520 			lrp->lr_return_type);
1521 		nfserr = nfserr_inval;
1522 		break;
1523 	}
1524 out:
1525 	return nfserr;
1526 }
1527 #endif /* CONFIG_NFSD_PNFS */
1528 
1529 /*
1530  * NULL call.
1531  */
1532 static __be32
1533 nfsd4_proc_null(struct svc_rqst *rqstp)
1534 {
1535 	return nfs_ok;
1536 }
1537 
1538 static inline void nfsd4_increment_op_stats(u32 opnum)
1539 {
1540 	if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1541 		nfsdstats.nfs4_opcount[opnum]++;
1542 }
1543 
1544 enum nfsd4_op_flags {
1545 	ALLOWED_WITHOUT_FH = 1 << 0,	/* No current filehandle required */
1546 	ALLOWED_ON_ABSENT_FS = 1 << 1,	/* ops processed on absent fs */
1547 	ALLOWED_AS_FIRST_OP = 1 << 2,	/* ops reqired first in compound */
1548 	/* For rfc 5661 section 2.6.3.1.1: */
1549 	OP_HANDLES_WRONGSEC = 1 << 3,
1550 	OP_IS_PUTFH_LIKE = 1 << 4,
1551 	/*
1552 	 * These are the ops whose result size we estimate before
1553 	 * encoding, to avoid performing an op then not being able to
1554 	 * respond or cache a response.  This includes writes and setattrs
1555 	 * as well as the operations usually called "nonidempotent":
1556 	 */
1557 	OP_MODIFIES_SOMETHING = 1 << 5,
1558 	/*
1559 	 * Cache compounds containing these ops in the xid-based drc:
1560 	 * We use the DRC for compounds containing non-idempotent
1561 	 * operations, *except* those that are 4.1-specific (since
1562 	 * sessions provide their own EOS), and except for stateful
1563 	 * operations other than setclientid and setclientid_confirm
1564 	 * (since sequence numbers provide EOS for open, lock, etc in
1565 	 * the v4.0 case).
1566 	 */
1567 	OP_CACHEME = 1 << 6,
1568 	/*
1569 	 * These are ops which clear current state id.
1570 	 */
1571 	OP_CLEAR_STATEID = 1 << 7,
1572 };
1573 
1574 struct nfsd4_operation {
1575 	__be32 (*op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1576 			union nfsd4_op_u *);
1577 	u32 op_flags;
1578 	char *op_name;
1579 	/* Try to get response size before operation */
1580 	u32 (*op_rsize_bop)(struct svc_rqst *, struct nfsd4_op *);
1581 	void (*op_get_currentstateid)(struct nfsd4_compound_state *,
1582 			union nfsd4_op_u *);
1583 	void (*op_set_currentstateid)(struct nfsd4_compound_state *,
1584 			union nfsd4_op_u *);
1585 };
1586 
1587 static const struct nfsd4_operation nfsd4_ops[];
1588 
1589 static const char *nfsd4_op_name(unsigned opnum);
1590 
1591 /*
1592  * Enforce NFSv4.1 COMPOUND ordering rules:
1593  *
1594  * Also note, enforced elsewhere:
1595  *	- SEQUENCE other than as first op results in
1596  *	  NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1597  *	- BIND_CONN_TO_SESSION must be the only op in its compound.
1598  *	  (Enforced in nfsd4_bind_conn_to_session().)
1599  *	- DESTROY_SESSION must be the final operation in a compound, if
1600  *	  sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1601  *	  (Enforced in nfsd4_destroy_session().)
1602  */
1603 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1604 {
1605 	struct nfsd4_op *op = &args->ops[0];
1606 
1607 	/* These ordering requirements don't apply to NFSv4.0: */
1608 	if (args->minorversion == 0)
1609 		return nfs_ok;
1610 	/* This is weird, but OK, not our problem: */
1611 	if (args->opcnt == 0)
1612 		return nfs_ok;
1613 	if (op->status == nfserr_op_illegal)
1614 		return nfs_ok;
1615 	if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1616 		return nfserr_op_not_in_session;
1617 	if (op->opnum == OP_SEQUENCE)
1618 		return nfs_ok;
1619 	if (args->opcnt != 1)
1620 		return nfserr_not_only_op;
1621 	return nfs_ok;
1622 }
1623 
1624 static inline const struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1625 {
1626 	return &nfsd4_ops[op->opnum];
1627 }
1628 
1629 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1630 {
1631 	if (op->opnum == OP_ILLEGAL)
1632 		return false;
1633 	return OPDESC(op)->op_flags & OP_CACHEME;
1634 }
1635 
1636 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1637 {
1638 	struct nfsd4_compoundres *resp = rqstp->rq_resp;
1639 	struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1640 	struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1641 	struct nfsd4_op *next = &argp->ops[resp->opcnt];
1642 	const struct nfsd4_operation *thisd = OPDESC(this);
1643 	const struct nfsd4_operation *nextd;
1644 
1645 	/*
1646 	 * Most ops check wronsec on our own; only the putfh-like ops
1647 	 * have special rules.
1648 	 */
1649 	if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1650 		return false;
1651 	/*
1652 	 * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1653 	 * put-filehandle operation if we're not going to use the
1654 	 * result:
1655 	 */
1656 	if (argp->opcnt == resp->opcnt)
1657 		return false;
1658 	if (next->opnum == OP_ILLEGAL)
1659 		return false;
1660 	nextd = OPDESC(next);
1661 	/*
1662 	 * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1663 	 * errors themselves as necessary; others should check for them
1664 	 * now:
1665 	 */
1666 	return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1667 }
1668 
1669 static void svcxdr_init_encode(struct svc_rqst *rqstp,
1670 			       struct nfsd4_compoundres *resp)
1671 {
1672 	struct xdr_stream *xdr = &resp->xdr;
1673 	struct xdr_buf *buf = &rqstp->rq_res;
1674 	struct kvec *head = buf->head;
1675 
1676 	xdr->buf = buf;
1677 	xdr->iov = head;
1678 	xdr->p   = head->iov_base + head->iov_len;
1679 	xdr->end = head->iov_base + PAGE_SIZE - rqstp->rq_auth_slack;
1680 	/* Tail and page_len should be zero at this point: */
1681 	buf->len = buf->head[0].iov_len;
1682 	xdr->scratch.iov_len = 0;
1683 	xdr->page_ptr = buf->pages - 1;
1684 	buf->buflen = PAGE_SIZE * (1 + rqstp->rq_page_end - buf->pages)
1685 		- rqstp->rq_auth_slack;
1686 }
1687 
1688 /*
1689  * COMPOUND call.
1690  */
1691 static __be32
1692 nfsd4_proc_compound(struct svc_rqst *rqstp)
1693 {
1694 	struct nfsd4_compoundargs *args = rqstp->rq_argp;
1695 	struct nfsd4_compoundres *resp = rqstp->rq_resp;
1696 	struct nfsd4_op	*op;
1697 	const struct nfsd4_operation *opdesc;
1698 	struct nfsd4_compound_state *cstate = &resp->cstate;
1699 	struct svc_fh *current_fh = &cstate->current_fh;
1700 	struct svc_fh *save_fh = &cstate->save_fh;
1701 	__be32		status;
1702 
1703 	svcxdr_init_encode(rqstp, resp);
1704 	resp->tagp = resp->xdr.p;
1705 	/* reserve space for: taglen, tag, and opcnt */
1706 	xdr_reserve_space(&resp->xdr, 8 + args->taglen);
1707 	resp->taglen = args->taglen;
1708 	resp->tag = args->tag;
1709 	resp->rqstp = rqstp;
1710 	cstate->minorversion = args->minorversion;
1711 	fh_init(current_fh, NFS4_FHSIZE);
1712 	fh_init(save_fh, NFS4_FHSIZE);
1713 	/*
1714 	 * Don't use the deferral mechanism for NFSv4; compounds make it
1715 	 * too hard to avoid non-idempotency problems.
1716 	 */
1717 	clear_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1718 
1719 	/*
1720 	 * According to RFC3010, this takes precedence over all other errors.
1721 	 */
1722 	status = nfserr_minor_vers_mismatch;
1723 	if (nfsd_minorversion(args->minorversion, NFSD_TEST) <= 0)
1724 		goto out;
1725 
1726 	status = nfs41_check_op_ordering(args);
1727 	if (status) {
1728 		op = &args->ops[0];
1729 		op->status = status;
1730 		goto encode_op;
1731 	}
1732 
1733 	while (!status && resp->opcnt < args->opcnt) {
1734 		op = &args->ops[resp->opcnt++];
1735 
1736 		dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1737 			resp->opcnt, args->opcnt, op->opnum,
1738 			nfsd4_op_name(op->opnum));
1739 		/*
1740 		 * The XDR decode routines may have pre-set op->status;
1741 		 * for example, if there is a miscellaneous XDR error
1742 		 * it will be set to nfserr_bad_xdr.
1743 		 */
1744 		if (op->status) {
1745 			if (op->opnum == OP_OPEN)
1746 				op->status = nfsd4_open_omfg(rqstp, cstate, op);
1747 			goto encode_op;
1748 		}
1749 
1750 		opdesc = OPDESC(op);
1751 
1752 		if (!current_fh->fh_dentry) {
1753 			if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1754 				op->status = nfserr_nofilehandle;
1755 				goto encode_op;
1756 			}
1757 		} else if (current_fh->fh_export->ex_fslocs.migrated &&
1758 			  !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1759 			op->status = nfserr_moved;
1760 			goto encode_op;
1761 		}
1762 
1763 		fh_clear_wcc(current_fh);
1764 
1765 		/* If op is non-idempotent */
1766 		if (opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1767 			/*
1768 			 * Don't execute this op if we couldn't encode a
1769 			 * succesful reply:
1770 			 */
1771 			u32 plen = opdesc->op_rsize_bop(rqstp, op);
1772 			/*
1773 			 * Plus if there's another operation, make sure
1774 			 * we'll have space to at least encode an error:
1775 			 */
1776 			if (resp->opcnt < args->opcnt)
1777 				plen += COMPOUND_ERR_SLACK_SPACE;
1778 			op->status = nfsd4_check_resp_size(resp, plen);
1779 		}
1780 
1781 		if (op->status)
1782 			goto encode_op;
1783 
1784 		if (opdesc->op_get_currentstateid)
1785 			opdesc->op_get_currentstateid(cstate, &op->u);
1786 		op->status = opdesc->op_func(rqstp, cstate, &op->u);
1787 
1788 		/* Only from SEQUENCE */
1789 		if (cstate->status == nfserr_replay_cache) {
1790 			dprintk("%s NFS4.1 replay from cache\n", __func__);
1791 			status = op->status;
1792 			goto out;
1793 		}
1794 		if (!op->status) {
1795 			if (opdesc->op_set_currentstateid)
1796 				opdesc->op_set_currentstateid(cstate, &op->u);
1797 
1798 			if (opdesc->op_flags & OP_CLEAR_STATEID)
1799 				clear_current_stateid(cstate);
1800 
1801 			if (need_wrongsec_check(rqstp))
1802 				op->status = check_nfsd_access(current_fh->fh_export, rqstp);
1803 		}
1804 encode_op:
1805 		if (op->status == nfserr_replay_me) {
1806 			op->replay = &cstate->replay_owner->so_replay;
1807 			nfsd4_encode_replay(&resp->xdr, op);
1808 			status = op->status = op->replay->rp_status;
1809 		} else {
1810 			nfsd4_encode_operation(resp, op);
1811 			status = op->status;
1812 		}
1813 
1814 		dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1815 			args->ops, args->opcnt, resp->opcnt, op->opnum,
1816 			be32_to_cpu(status));
1817 
1818 		nfsd4_cstate_clear_replay(cstate);
1819 		nfsd4_increment_op_stats(op->opnum);
1820 	}
1821 
1822 	cstate->status = status;
1823 	fh_put(current_fh);
1824 	fh_put(save_fh);
1825 	BUG_ON(cstate->replay_owner);
1826 out:
1827 	/* Reset deferral mechanism for RPC deferrals */
1828 	set_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1829 	dprintk("nfsv4 compound returned %d\n", ntohl(status));
1830 	return status;
1831 }
1832 
1833 #define op_encode_hdr_size		(2)
1834 #define op_encode_stateid_maxsz		(XDR_QUADLEN(NFS4_STATEID_SIZE))
1835 #define op_encode_verifier_maxsz	(XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1836 #define op_encode_change_info_maxsz	(5)
1837 #define nfs4_fattr_bitmap_maxsz		(4)
1838 
1839 /* We'll fall back on returning no lockowner if run out of space: */
1840 #define op_encode_lockowner_maxsz	(0)
1841 #define op_encode_lock_denied_maxsz	(8 + op_encode_lockowner_maxsz)
1842 
1843 #define nfs4_owner_maxsz		(1 + XDR_QUADLEN(IDMAP_NAMESZ))
1844 
1845 #define op_encode_ace_maxsz		(3 + nfs4_owner_maxsz)
1846 #define op_encode_delegation_maxsz	(1 + op_encode_stateid_maxsz + 1 + \
1847 					 op_encode_ace_maxsz)
1848 
1849 #define op_encode_channel_attrs_maxsz	(6 + 1 + 1)
1850 
1851 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1852 {
1853 	return (op_encode_hdr_size) * sizeof(__be32);
1854 }
1855 
1856 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1857 {
1858 	return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1859 }
1860 
1861 static inline u32 nfsd4_access_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1862 {
1863 	/* ac_supported, ac_resp_access */
1864 	return (op_encode_hdr_size + 2)* sizeof(__be32);
1865 }
1866 
1867 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1868 {
1869 	return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1870 }
1871 
1872 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1873 {
1874 	return (op_encode_hdr_size + op_encode_change_info_maxsz
1875 		+ nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1876 }
1877 
1878 /*
1879  * Note since this is an idempotent operation we won't insist on failing
1880  * the op prematurely if the estimate is too large.  We may turn off splice
1881  * reads unnecessarily.
1882  */
1883 static inline u32 nfsd4_getattr_rsize(struct svc_rqst *rqstp,
1884 				      struct nfsd4_op *op)
1885 {
1886 	u32 *bmap = op->u.getattr.ga_bmval;
1887 	u32 bmap0 = bmap[0], bmap1 = bmap[1], bmap2 = bmap[2];
1888 	u32 ret = 0;
1889 
1890 	if (bmap0 & FATTR4_WORD0_ACL)
1891 		return svc_max_payload(rqstp);
1892 	if (bmap0 & FATTR4_WORD0_FS_LOCATIONS)
1893 		return svc_max_payload(rqstp);
1894 
1895 	if (bmap1 & FATTR4_WORD1_OWNER) {
1896 		ret += IDMAP_NAMESZ + 4;
1897 		bmap1 &= ~FATTR4_WORD1_OWNER;
1898 	}
1899 	if (bmap1 & FATTR4_WORD1_OWNER_GROUP) {
1900 		ret += IDMAP_NAMESZ + 4;
1901 		bmap1 &= ~FATTR4_WORD1_OWNER_GROUP;
1902 	}
1903 	if (bmap0 & FATTR4_WORD0_FILEHANDLE) {
1904 		ret += NFS4_FHSIZE + 4;
1905 		bmap0 &= ~FATTR4_WORD0_FILEHANDLE;
1906 	}
1907 	if (bmap2 & FATTR4_WORD2_SECURITY_LABEL) {
1908 		ret += NFS4_MAXLABELLEN + 12;
1909 		bmap2 &= ~FATTR4_WORD2_SECURITY_LABEL;
1910 	}
1911 	/*
1912 	 * Largest of remaining attributes are 16 bytes (e.g.,
1913 	 * supported_attributes)
1914 	 */
1915 	ret += 16 * (hweight32(bmap0) + hweight32(bmap1) + hweight32(bmap2));
1916 	/* bitmask, length */
1917 	ret += 20;
1918 	return ret;
1919 }
1920 
1921 static inline u32 nfsd4_getfh_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1922 {
1923 	return (op_encode_hdr_size + 1) * sizeof(__be32) + NFS4_FHSIZE;
1924 }
1925 
1926 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1927 {
1928 	return (op_encode_hdr_size + op_encode_change_info_maxsz)
1929 		* sizeof(__be32);
1930 }
1931 
1932 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1933 {
1934 	return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1935 		* sizeof(__be32);
1936 }
1937 
1938 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1939 {
1940 	return (op_encode_hdr_size + op_encode_stateid_maxsz
1941 		+ op_encode_change_info_maxsz + 1
1942 		+ nfs4_fattr_bitmap_maxsz
1943 		+ op_encode_delegation_maxsz) * sizeof(__be32);
1944 }
1945 
1946 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1947 {
1948 	u32 maxcount = 0, rlen = 0;
1949 
1950 	maxcount = svc_max_payload(rqstp);
1951 	rlen = min(op->u.read.rd_length, maxcount);
1952 
1953 	return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
1954 }
1955 
1956 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1957 {
1958 	u32 maxcount = 0, rlen = 0;
1959 
1960 	maxcount = svc_max_payload(rqstp);
1961 	rlen = min(op->u.readdir.rd_maxcount, maxcount);
1962 
1963 	return (op_encode_hdr_size + op_encode_verifier_maxsz +
1964 		XDR_QUADLEN(rlen)) * sizeof(__be32);
1965 }
1966 
1967 static inline u32 nfsd4_readlink_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1968 {
1969 	return (op_encode_hdr_size + 1) * sizeof(__be32) + PAGE_SIZE;
1970 }
1971 
1972 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1973 {
1974 	return (op_encode_hdr_size + op_encode_change_info_maxsz)
1975 		* sizeof(__be32);
1976 }
1977 
1978 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1979 {
1980 	return (op_encode_hdr_size + op_encode_change_info_maxsz
1981 		+ op_encode_change_info_maxsz) * sizeof(__be32);
1982 }
1983 
1984 static inline u32 nfsd4_sequence_rsize(struct svc_rqst *rqstp,
1985 				       struct nfsd4_op *op)
1986 {
1987 	return (op_encode_hdr_size
1988 		+ XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5) * sizeof(__be32);
1989 }
1990 
1991 static inline u32 nfsd4_test_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1992 {
1993 	return (op_encode_hdr_size + 1 + op->u.test_stateid.ts_num_ids)
1994 		* sizeof(__be32);
1995 }
1996 
1997 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1998 {
1999 	return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
2000 }
2001 
2002 static inline u32 nfsd4_secinfo_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2003 {
2004 	return (op_encode_hdr_size + RPC_AUTH_MAXFLAVOR *
2005 		(4 + XDR_QUADLEN(GSS_OID_MAX_LEN))) * sizeof(__be32);
2006 }
2007 
2008 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2009 {
2010 	return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
2011 								sizeof(__be32);
2012 }
2013 
2014 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2015 {
2016 	return (op_encode_hdr_size + 2 + op_encode_verifier_maxsz) * sizeof(__be32);
2017 }
2018 
2019 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2020 {
2021 	return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
2022 		1 + 1 + /* eir_flags, spr_how */\
2023 		4 + /* spo_must_enforce & _allow with bitmap */\
2024 		2 + /*eir_server_owner.so_minor_id */\
2025 		/* eir_server_owner.so_major_id<> */\
2026 		XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
2027 		/* eir_server_scope<> */\
2028 		XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
2029 		1 + /* eir_server_impl_id array length */\
2030 		0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
2031 }
2032 
2033 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2034 {
2035 	return (op_encode_hdr_size + \
2036 		XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
2037 		2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
2038 }
2039 
2040 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2041 {
2042 	return (op_encode_hdr_size + \
2043 		XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
2044 		2 + /* csr_sequence, csr_flags */\
2045 		op_encode_channel_attrs_maxsz + \
2046 		op_encode_channel_attrs_maxsz) * sizeof(__be32);
2047 }
2048 
2049 static inline u32 nfsd4_copy_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2050 {
2051 	return (op_encode_hdr_size +
2052 		1 /* wr_callback */ +
2053 		op_encode_stateid_maxsz /* wr_callback */ +
2054 		2 /* wr_count */ +
2055 		1 /* wr_committed */ +
2056 		op_encode_verifier_maxsz +
2057 		1 /* cr_consecutive */ +
2058 		1 /* cr_synchronous */) * sizeof(__be32);
2059 }
2060 
2061 #ifdef CONFIG_NFSD_PNFS
2062 static inline u32 nfsd4_getdeviceinfo_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2063 {
2064 	u32 maxcount = 0, rlen = 0;
2065 
2066 	maxcount = svc_max_payload(rqstp);
2067 	rlen = min(op->u.getdeviceinfo.gd_maxcount, maxcount);
2068 
2069 	return (op_encode_hdr_size +
2070 		1 /* gd_layout_type*/ +
2071 		XDR_QUADLEN(rlen) +
2072 		2 /* gd_notify_types */) * sizeof(__be32);
2073 }
2074 
2075 /*
2076  * At this stage we don't really know what layout driver will handle the request,
2077  * so we need to define an arbitrary upper bound here.
2078  */
2079 #define MAX_LAYOUT_SIZE		128
2080 static inline u32 nfsd4_layoutget_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2081 {
2082 	return (op_encode_hdr_size +
2083 		1 /* logr_return_on_close */ +
2084 		op_encode_stateid_maxsz +
2085 		1 /* nr of layouts */ +
2086 		MAX_LAYOUT_SIZE) * sizeof(__be32);
2087 }
2088 
2089 static inline u32 nfsd4_layoutcommit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2090 {
2091 	return (op_encode_hdr_size +
2092 		1 /* locr_newsize */ +
2093 		2 /* ns_size */) * sizeof(__be32);
2094 }
2095 
2096 static inline u32 nfsd4_layoutreturn_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2097 {
2098 	return (op_encode_hdr_size +
2099 		1 /* lrs_stateid */ +
2100 		op_encode_stateid_maxsz) * sizeof(__be32);
2101 }
2102 #endif /* CONFIG_NFSD_PNFS */
2103 
2104 
2105 static inline u32 nfsd4_seek_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2106 {
2107 	return (op_encode_hdr_size + 3) * sizeof(__be32);
2108 }
2109 
2110 static const struct nfsd4_operation nfsd4_ops[] = {
2111 	[OP_ACCESS] = {
2112 		.op_func = nfsd4_access,
2113 		.op_name = "OP_ACCESS",
2114 		.op_rsize_bop = nfsd4_access_rsize,
2115 	},
2116 	[OP_CLOSE] = {
2117 		.op_func = nfsd4_close,
2118 		.op_flags = OP_MODIFIES_SOMETHING,
2119 		.op_name = "OP_CLOSE",
2120 		.op_rsize_bop = nfsd4_status_stateid_rsize,
2121 		.op_get_currentstateid = nfsd4_get_closestateid,
2122 		.op_set_currentstateid = nfsd4_set_closestateid,
2123 	},
2124 	[OP_COMMIT] = {
2125 		.op_func = nfsd4_commit,
2126 		.op_flags = OP_MODIFIES_SOMETHING,
2127 		.op_name = "OP_COMMIT",
2128 		.op_rsize_bop = nfsd4_commit_rsize,
2129 	},
2130 	[OP_CREATE] = {
2131 		.op_func = nfsd4_create,
2132 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
2133 		.op_name = "OP_CREATE",
2134 		.op_rsize_bop = nfsd4_create_rsize,
2135 	},
2136 	[OP_DELEGRETURN] = {
2137 		.op_func = nfsd4_delegreturn,
2138 		.op_flags = OP_MODIFIES_SOMETHING,
2139 		.op_name = "OP_DELEGRETURN",
2140 		.op_rsize_bop = nfsd4_only_status_rsize,
2141 		.op_get_currentstateid = nfsd4_get_delegreturnstateid,
2142 	},
2143 	[OP_GETATTR] = {
2144 		.op_func = nfsd4_getattr,
2145 		.op_flags = ALLOWED_ON_ABSENT_FS,
2146 		.op_rsize_bop = nfsd4_getattr_rsize,
2147 		.op_name = "OP_GETATTR",
2148 	},
2149 	[OP_GETFH] = {
2150 		.op_func = nfsd4_getfh,
2151 		.op_name = "OP_GETFH",
2152 		.op_rsize_bop = nfsd4_getfh_rsize,
2153 	},
2154 	[OP_LINK] = {
2155 		.op_func = nfsd4_link,
2156 		.op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
2157 				| OP_CACHEME,
2158 		.op_name = "OP_LINK",
2159 		.op_rsize_bop = nfsd4_link_rsize,
2160 	},
2161 	[OP_LOCK] = {
2162 		.op_func = nfsd4_lock,
2163 		.op_flags = OP_MODIFIES_SOMETHING,
2164 		.op_name = "OP_LOCK",
2165 		.op_rsize_bop = nfsd4_lock_rsize,
2166 		.op_set_currentstateid = nfsd4_set_lockstateid,
2167 	},
2168 	[OP_LOCKT] = {
2169 		.op_func = nfsd4_lockt,
2170 		.op_name = "OP_LOCKT",
2171 		.op_rsize_bop = nfsd4_lock_rsize,
2172 	},
2173 	[OP_LOCKU] = {
2174 		.op_func = nfsd4_locku,
2175 		.op_flags = OP_MODIFIES_SOMETHING,
2176 		.op_name = "OP_LOCKU",
2177 		.op_rsize_bop = nfsd4_status_stateid_rsize,
2178 		.op_get_currentstateid = nfsd4_get_lockustateid,
2179 	},
2180 	[OP_LOOKUP] = {
2181 		.op_func = nfsd4_lookup,
2182 		.op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2183 		.op_name = "OP_LOOKUP",
2184 		.op_rsize_bop = nfsd4_only_status_rsize,
2185 	},
2186 	[OP_LOOKUPP] = {
2187 		.op_func = nfsd4_lookupp,
2188 		.op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2189 		.op_name = "OP_LOOKUPP",
2190 		.op_rsize_bop = nfsd4_only_status_rsize,
2191 	},
2192 	[OP_NVERIFY] = {
2193 		.op_func = nfsd4_nverify,
2194 		.op_name = "OP_NVERIFY",
2195 		.op_rsize_bop = nfsd4_only_status_rsize,
2196 	},
2197 	[OP_OPEN] = {
2198 		.op_func = nfsd4_open,
2199 		.op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2200 		.op_name = "OP_OPEN",
2201 		.op_rsize_bop = nfsd4_open_rsize,
2202 		.op_set_currentstateid = nfsd4_set_openstateid,
2203 	},
2204 	[OP_OPEN_CONFIRM] = {
2205 		.op_func = nfsd4_open_confirm,
2206 		.op_flags = OP_MODIFIES_SOMETHING,
2207 		.op_name = "OP_OPEN_CONFIRM",
2208 		.op_rsize_bop = nfsd4_status_stateid_rsize,
2209 	},
2210 	[OP_OPEN_DOWNGRADE] = {
2211 		.op_func = nfsd4_open_downgrade,
2212 		.op_flags = OP_MODIFIES_SOMETHING,
2213 		.op_name = "OP_OPEN_DOWNGRADE",
2214 		.op_rsize_bop = nfsd4_status_stateid_rsize,
2215 		.op_get_currentstateid = nfsd4_get_opendowngradestateid,
2216 		.op_set_currentstateid = nfsd4_set_opendowngradestateid,
2217 	},
2218 	[OP_PUTFH] = {
2219 		.op_func = nfsd4_putfh,
2220 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2221 				| OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2222 		.op_name = "OP_PUTFH",
2223 		.op_rsize_bop = nfsd4_only_status_rsize,
2224 	},
2225 	[OP_PUTPUBFH] = {
2226 		.op_func = nfsd4_putrootfh,
2227 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2228 				| OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2229 		.op_name = "OP_PUTPUBFH",
2230 		.op_rsize_bop = nfsd4_only_status_rsize,
2231 	},
2232 	[OP_PUTROOTFH] = {
2233 		.op_func = nfsd4_putrootfh,
2234 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2235 				| OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2236 		.op_name = "OP_PUTROOTFH",
2237 		.op_rsize_bop = nfsd4_only_status_rsize,
2238 	},
2239 	[OP_READ] = {
2240 		.op_func = nfsd4_read,
2241 		.op_name = "OP_READ",
2242 		.op_rsize_bop = nfsd4_read_rsize,
2243 		.op_get_currentstateid = nfsd4_get_readstateid,
2244 	},
2245 	[OP_READDIR] = {
2246 		.op_func = nfsd4_readdir,
2247 		.op_name = "OP_READDIR",
2248 		.op_rsize_bop = nfsd4_readdir_rsize,
2249 	},
2250 	[OP_READLINK] = {
2251 		.op_func = nfsd4_readlink,
2252 		.op_name = "OP_READLINK",
2253 		.op_rsize_bop = nfsd4_readlink_rsize,
2254 	},
2255 	[OP_REMOVE] = {
2256 		.op_func = nfsd4_remove,
2257 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2258 		.op_name = "OP_REMOVE",
2259 		.op_rsize_bop = nfsd4_remove_rsize,
2260 	},
2261 	[OP_RENAME] = {
2262 		.op_func = nfsd4_rename,
2263 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2264 		.op_name = "OP_RENAME",
2265 		.op_rsize_bop = nfsd4_rename_rsize,
2266 	},
2267 	[OP_RENEW] = {
2268 		.op_func = nfsd4_renew,
2269 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2270 				| OP_MODIFIES_SOMETHING,
2271 		.op_name = "OP_RENEW",
2272 		.op_rsize_bop = nfsd4_only_status_rsize,
2273 
2274 	},
2275 	[OP_RESTOREFH] = {
2276 		.op_func = nfsd4_restorefh,
2277 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2278 				| OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
2279 		.op_name = "OP_RESTOREFH",
2280 		.op_rsize_bop = nfsd4_only_status_rsize,
2281 	},
2282 	[OP_SAVEFH] = {
2283 		.op_func = nfsd4_savefh,
2284 		.op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2285 		.op_name = "OP_SAVEFH",
2286 		.op_rsize_bop = nfsd4_only_status_rsize,
2287 	},
2288 	[OP_SECINFO] = {
2289 		.op_func = nfsd4_secinfo,
2290 		.op_flags = OP_HANDLES_WRONGSEC,
2291 		.op_name = "OP_SECINFO",
2292 		.op_rsize_bop = nfsd4_secinfo_rsize,
2293 	},
2294 	[OP_SETATTR] = {
2295 		.op_func = nfsd4_setattr,
2296 		.op_name = "OP_SETATTR",
2297 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2298 		.op_rsize_bop = nfsd4_setattr_rsize,
2299 		.op_get_currentstateid = nfsd4_get_setattrstateid,
2300 	},
2301 	[OP_SETCLIENTID] = {
2302 		.op_func = nfsd4_setclientid,
2303 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2304 				| OP_MODIFIES_SOMETHING | OP_CACHEME,
2305 		.op_name = "OP_SETCLIENTID",
2306 		.op_rsize_bop = nfsd4_setclientid_rsize,
2307 	},
2308 	[OP_SETCLIENTID_CONFIRM] = {
2309 		.op_func = nfsd4_setclientid_confirm,
2310 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2311 				| OP_MODIFIES_SOMETHING | OP_CACHEME,
2312 		.op_name = "OP_SETCLIENTID_CONFIRM",
2313 		.op_rsize_bop = nfsd4_only_status_rsize,
2314 	},
2315 	[OP_VERIFY] = {
2316 		.op_func = nfsd4_verify,
2317 		.op_name = "OP_VERIFY",
2318 		.op_rsize_bop = nfsd4_only_status_rsize,
2319 	},
2320 	[OP_WRITE] = {
2321 		.op_func = nfsd4_write,
2322 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2323 		.op_name = "OP_WRITE",
2324 		.op_rsize_bop = nfsd4_write_rsize,
2325 		.op_get_currentstateid = nfsd4_get_writestateid,
2326 	},
2327 	[OP_RELEASE_LOCKOWNER] = {
2328 		.op_func = nfsd4_release_lockowner,
2329 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2330 				| OP_MODIFIES_SOMETHING,
2331 		.op_name = "OP_RELEASE_LOCKOWNER",
2332 		.op_rsize_bop = nfsd4_only_status_rsize,
2333 	},
2334 
2335 	/* NFSv4.1 operations */
2336 	[OP_EXCHANGE_ID] = {
2337 		.op_func = nfsd4_exchange_id,
2338 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2339 				| OP_MODIFIES_SOMETHING,
2340 		.op_name = "OP_EXCHANGE_ID",
2341 		.op_rsize_bop = nfsd4_exchange_id_rsize,
2342 	},
2343 	[OP_BACKCHANNEL_CTL] = {
2344 		.op_func = nfsd4_backchannel_ctl,
2345 		.op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2346 		.op_name = "OP_BACKCHANNEL_CTL",
2347 		.op_rsize_bop = nfsd4_only_status_rsize,
2348 	},
2349 	[OP_BIND_CONN_TO_SESSION] = {
2350 		.op_func = nfsd4_bind_conn_to_session,
2351 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2352 				| OP_MODIFIES_SOMETHING,
2353 		.op_name = "OP_BIND_CONN_TO_SESSION",
2354 		.op_rsize_bop = nfsd4_bind_conn_to_session_rsize,
2355 	},
2356 	[OP_CREATE_SESSION] = {
2357 		.op_func = nfsd4_create_session,
2358 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2359 				| OP_MODIFIES_SOMETHING,
2360 		.op_name = "OP_CREATE_SESSION",
2361 		.op_rsize_bop = nfsd4_create_session_rsize,
2362 	},
2363 	[OP_DESTROY_SESSION] = {
2364 		.op_func = nfsd4_destroy_session,
2365 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2366 				| OP_MODIFIES_SOMETHING,
2367 		.op_name = "OP_DESTROY_SESSION",
2368 		.op_rsize_bop = nfsd4_only_status_rsize,
2369 	},
2370 	[OP_SEQUENCE] = {
2371 		.op_func = nfsd4_sequence,
2372 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
2373 		.op_name = "OP_SEQUENCE",
2374 		.op_rsize_bop = nfsd4_sequence_rsize,
2375 	},
2376 	[OP_DESTROY_CLIENTID] = {
2377 		.op_func = nfsd4_destroy_clientid,
2378 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2379 				| OP_MODIFIES_SOMETHING,
2380 		.op_name = "OP_DESTROY_CLIENTID",
2381 		.op_rsize_bop = nfsd4_only_status_rsize,
2382 	},
2383 	[OP_RECLAIM_COMPLETE] = {
2384 		.op_func = nfsd4_reclaim_complete,
2385 		.op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2386 		.op_name = "OP_RECLAIM_COMPLETE",
2387 		.op_rsize_bop = nfsd4_only_status_rsize,
2388 	},
2389 	[OP_SECINFO_NO_NAME] = {
2390 		.op_func = nfsd4_secinfo_no_name,
2391 		.op_flags = OP_HANDLES_WRONGSEC,
2392 		.op_name = "OP_SECINFO_NO_NAME",
2393 		.op_rsize_bop = nfsd4_secinfo_rsize,
2394 	},
2395 	[OP_TEST_STATEID] = {
2396 		.op_func = nfsd4_test_stateid,
2397 		.op_flags = ALLOWED_WITHOUT_FH,
2398 		.op_name = "OP_TEST_STATEID",
2399 		.op_rsize_bop = nfsd4_test_stateid_rsize,
2400 	},
2401 	[OP_FREE_STATEID] = {
2402 		.op_func = nfsd4_free_stateid,
2403 		.op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2404 		.op_name = "OP_FREE_STATEID",
2405 		.op_get_currentstateid = nfsd4_get_freestateid,
2406 		.op_rsize_bop = nfsd4_only_status_rsize,
2407 	},
2408 #ifdef CONFIG_NFSD_PNFS
2409 	[OP_GETDEVICEINFO] = {
2410 		.op_func = nfsd4_getdeviceinfo,
2411 		.op_flags = ALLOWED_WITHOUT_FH,
2412 		.op_name = "OP_GETDEVICEINFO",
2413 		.op_rsize_bop = nfsd4_getdeviceinfo_rsize,
2414 	},
2415 	[OP_LAYOUTGET] = {
2416 		.op_func = nfsd4_layoutget,
2417 		.op_flags = OP_MODIFIES_SOMETHING,
2418 		.op_name = "OP_LAYOUTGET",
2419 		.op_rsize_bop = nfsd4_layoutget_rsize,
2420 	},
2421 	[OP_LAYOUTCOMMIT] = {
2422 		.op_func = nfsd4_layoutcommit,
2423 		.op_flags = OP_MODIFIES_SOMETHING,
2424 		.op_name = "OP_LAYOUTCOMMIT",
2425 		.op_rsize_bop = nfsd4_layoutcommit_rsize,
2426 	},
2427 	[OP_LAYOUTRETURN] = {
2428 		.op_func = nfsd4_layoutreturn,
2429 		.op_flags = OP_MODIFIES_SOMETHING,
2430 		.op_name = "OP_LAYOUTRETURN",
2431 		.op_rsize_bop = nfsd4_layoutreturn_rsize,
2432 	},
2433 #endif /* CONFIG_NFSD_PNFS */
2434 
2435 	/* NFSv4.2 operations */
2436 	[OP_ALLOCATE] = {
2437 		.op_func = nfsd4_allocate,
2438 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2439 		.op_name = "OP_ALLOCATE",
2440 		.op_rsize_bop = nfsd4_only_status_rsize,
2441 	},
2442 	[OP_DEALLOCATE] = {
2443 		.op_func = nfsd4_deallocate,
2444 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2445 		.op_name = "OP_DEALLOCATE",
2446 		.op_rsize_bop = nfsd4_only_status_rsize,
2447 	},
2448 	[OP_CLONE] = {
2449 		.op_func = nfsd4_clone,
2450 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2451 		.op_name = "OP_CLONE",
2452 		.op_rsize_bop = nfsd4_only_status_rsize,
2453 	},
2454 	[OP_COPY] = {
2455 		.op_func = nfsd4_copy,
2456 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2457 		.op_name = "OP_COPY",
2458 		.op_rsize_bop = nfsd4_copy_rsize,
2459 	},
2460 	[OP_SEEK] = {
2461 		.op_func = nfsd4_seek,
2462 		.op_name = "OP_SEEK",
2463 		.op_rsize_bop = nfsd4_seek_rsize,
2464 	},
2465 };
2466 
2467 /**
2468  * nfsd4_spo_must_allow - Determine if the compound op contains an
2469  * operation that is allowed to be sent with machine credentials
2470  *
2471  * @rqstp: a pointer to the struct svc_rqst
2472  *
2473  * Checks to see if the compound contains a spo_must_allow op
2474  * and confirms that it was sent with the proper machine creds.
2475  */
2476 
2477 bool nfsd4_spo_must_allow(struct svc_rqst *rqstp)
2478 {
2479 	struct nfsd4_compoundres *resp = rqstp->rq_resp;
2480 	struct nfsd4_compoundargs *argp = rqstp->rq_argp;
2481 	struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
2482 	struct nfsd4_compound_state *cstate = &resp->cstate;
2483 	struct nfs4_op_map *allow = &cstate->clp->cl_spo_must_allow;
2484 	u32 opiter;
2485 
2486 	if (!cstate->minorversion)
2487 		return false;
2488 
2489 	if (cstate->spo_must_allowed == true)
2490 		return true;
2491 
2492 	opiter = resp->opcnt;
2493 	while (opiter < argp->opcnt) {
2494 		this = &argp->ops[opiter++];
2495 		if (test_bit(this->opnum, allow->u.longs) &&
2496 			cstate->clp->cl_mach_cred &&
2497 			nfsd4_mach_creds_match(cstate->clp, rqstp)) {
2498 			cstate->spo_must_allowed = true;
2499 			return true;
2500 		}
2501 	}
2502 	cstate->spo_must_allowed = false;
2503 	return false;
2504 }
2505 
2506 int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
2507 {
2508 	if (op->opnum == OP_ILLEGAL || op->status == nfserr_notsupp)
2509 		return op_encode_hdr_size * sizeof(__be32);
2510 
2511 	BUG_ON(OPDESC(op)->op_rsize_bop == NULL);
2512 	return OPDESC(op)->op_rsize_bop(rqstp, op);
2513 }
2514 
2515 void warn_on_nonidempotent_op(struct nfsd4_op *op)
2516 {
2517 	if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
2518 		pr_err("unable to encode reply to nonidempotent op %d (%s)\n",
2519 			op->opnum, nfsd4_op_name(op->opnum));
2520 		WARN_ON_ONCE(1);
2521 	}
2522 }
2523 
2524 static const char *nfsd4_op_name(unsigned opnum)
2525 {
2526 	if (opnum < ARRAY_SIZE(nfsd4_ops))
2527 		return nfsd4_ops[opnum].op_name;
2528 	return "unknown_operation";
2529 }
2530 
2531 #define nfsd4_voidres			nfsd4_voidargs
2532 struct nfsd4_voidargs { int dummy; };
2533 
2534 static const struct svc_procedure nfsd_procedures4[2] = {
2535 	[NFSPROC4_NULL] = {
2536 		.pc_func = nfsd4_proc_null,
2537 		.pc_encode = nfs4svc_encode_voidres,
2538 		.pc_argsize = sizeof(struct nfsd4_voidargs),
2539 		.pc_ressize = sizeof(struct nfsd4_voidres),
2540 		.pc_cachetype = RC_NOCACHE,
2541 		.pc_xdrressize = 1,
2542 	},
2543 	[NFSPROC4_COMPOUND] = {
2544 		.pc_func = nfsd4_proc_compound,
2545 		.pc_decode = nfs4svc_decode_compoundargs,
2546 		.pc_encode = nfs4svc_encode_compoundres,
2547 		.pc_argsize = sizeof(struct nfsd4_compoundargs),
2548 		.pc_ressize = sizeof(struct nfsd4_compoundres),
2549 		.pc_release = nfsd4_release_compoundargs,
2550 		.pc_cachetype = RC_NOCACHE,
2551 		.pc_xdrressize = NFSD_BUFSIZE/4,
2552 	},
2553 };
2554 
2555 static unsigned int nfsd_count3[ARRAY_SIZE(nfsd_procedures4)];
2556 const struct svc_version nfsd_version4 = {
2557 	.vs_vers		= 4,
2558 	.vs_nproc		= 2,
2559 	.vs_proc		= nfsd_procedures4,
2560 	.vs_count		= nfsd_count3,
2561 	.vs_dispatch		= nfsd_dispatch,
2562 	.vs_xdrsize		= NFS4_SVC_XDRSIZE,
2563 	.vs_rpcb_optnl		= true,
2564 	.vs_need_cong_ctrl	= true,
2565 };
2566 
2567 /*
2568  * Local variables:
2569  *  c-basic-offset: 8
2570  * End:
2571  */
2572