xref: /openbmc/linux/fs/nfsd/nfs4proc.c (revision 47ebd031)
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/fs_struct.h>
36 #include <linux/file.h>
37 #include <linux/falloc.h>
38 #include <linux/slab.h>
39 #include <linux/kthread.h>
40 #include <linux/namei.h>
41 
42 #include <linux/sunrpc/addr.h>
43 #include <linux/nfs_ssc.h>
44 
45 #include "idmap.h"
46 #include "cache.h"
47 #include "xdr4.h"
48 #include "vfs.h"
49 #include "current_stateid.h"
50 #include "netns.h"
51 #include "acl.h"
52 #include "pnfs.h"
53 #include "trace.h"
54 
55 static bool inter_copy_offload_enable;
56 module_param(inter_copy_offload_enable, bool, 0644);
57 MODULE_PARM_DESC(inter_copy_offload_enable,
58 		 "Enable inter server to server copy offload. Default: false");
59 
60 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
61 static int nfsd4_ssc_umount_timeout = 900000;		/* default to 15 mins */
62 module_param(nfsd4_ssc_umount_timeout, int, 0644);
63 MODULE_PARM_DESC(nfsd4_ssc_umount_timeout,
64 		"idle msecs before unmount export from source server");
65 #endif
66 
67 #define NFSDDBG_FACILITY		NFSDDBG_PROC
68 
69 static u32 nfsd_attrmask[] = {
70 	NFSD_WRITEABLE_ATTRS_WORD0,
71 	NFSD_WRITEABLE_ATTRS_WORD1,
72 	NFSD_WRITEABLE_ATTRS_WORD2
73 };
74 
75 static u32 nfsd41_ex_attrmask[] = {
76 	NFSD_SUPPATTR_EXCLCREAT_WORD0,
77 	NFSD_SUPPATTR_EXCLCREAT_WORD1,
78 	NFSD_SUPPATTR_EXCLCREAT_WORD2
79 };
80 
81 static __be32
82 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
83 		   u32 *bmval, u32 *writable)
84 {
85 	struct dentry *dentry = cstate->current_fh.fh_dentry;
86 	struct svc_export *exp = cstate->current_fh.fh_export;
87 
88 	if (!nfsd_attrs_supported(cstate->minorversion, bmval))
89 		return nfserr_attrnotsupp;
90 	if ((bmval[0] & FATTR4_WORD0_ACL) && !IS_POSIXACL(d_inode(dentry)))
91 		return nfserr_attrnotsupp;
92 	if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) &&
93 			!(exp->ex_flags & NFSEXP_SECURITY_LABEL))
94 		return nfserr_attrnotsupp;
95 	if (writable && !bmval_is_subset(bmval, writable))
96 		return nfserr_inval;
97 	if (writable && (bmval[2] & FATTR4_WORD2_MODE_UMASK) &&
98 			(bmval[1] & FATTR4_WORD1_MODE))
99 		return nfserr_inval;
100 	return nfs_ok;
101 }
102 
103 static __be32
104 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
105 	struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
106 {
107 	__be32 status = nfs_ok;
108 
109 	if (open->op_create == NFS4_OPEN_CREATE) {
110 		if (open->op_createmode == NFS4_CREATE_UNCHECKED
111 		    || open->op_createmode == NFS4_CREATE_GUARDED)
112 			status = check_attr_support(rqstp, cstate,
113 					open->op_bmval, nfsd_attrmask);
114 		else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
115 			status = check_attr_support(rqstp, cstate,
116 					open->op_bmval, nfsd41_ex_attrmask);
117 	}
118 
119 	return status;
120 }
121 
122 static int
123 is_create_with_attrs(struct nfsd4_open *open)
124 {
125 	return open->op_create == NFS4_OPEN_CREATE
126 		&& (open->op_createmode == NFS4_CREATE_UNCHECKED
127 		    || open->op_createmode == NFS4_CREATE_GUARDED
128 		    || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
129 }
130 
131 static inline void
132 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
133 {
134 	fh_put(dst);
135 	dget(src->fh_dentry);
136 	if (src->fh_export)
137 		exp_get(src->fh_export);
138 	*dst = *src;
139 }
140 
141 static __be32
142 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
143 {
144 
145 	if (open->op_truncate &&
146 		!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
147 		return nfserr_inval;
148 
149 	accmode |= NFSD_MAY_READ_IF_EXEC;
150 
151 	if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
152 		accmode |= NFSD_MAY_READ;
153 	if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
154 		accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
155 	if (open->op_share_deny & NFS4_SHARE_DENY_READ)
156 		accmode |= NFSD_MAY_WRITE;
157 
158 	return fh_verify(rqstp, current_fh, S_IFREG, accmode);
159 }
160 
161 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
162 {
163 	umode_t mode = d_inode(fh->fh_dentry)->i_mode;
164 
165 	if (S_ISREG(mode))
166 		return nfs_ok;
167 	if (S_ISDIR(mode))
168 		return nfserr_isdir;
169 	/*
170 	 * Using err_symlink as our catch-all case may look odd; but
171 	 * there's no other obvious error for this case in 4.0, and we
172 	 * happen to know that it will cause the linux v4 client to do
173 	 * the right thing on attempts to open something other than a
174 	 * regular file.
175 	 */
176 	return nfserr_symlink;
177 }
178 
179 static void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh *resfh)
180 {
181 	if (nfsd4_has_session(cstate))
182 		return;
183 	fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
184 			&resfh->fh_handle);
185 }
186 
187 static inline bool nfsd4_create_is_exclusive(int createmode)
188 {
189 	return createmode == NFS4_CREATE_EXCLUSIVE ||
190 		createmode == NFS4_CREATE_EXCLUSIVE4_1;
191 }
192 
193 static __be32
194 nfsd4_vfs_create(struct svc_fh *fhp, struct dentry *child,
195 		 struct nfsd4_open *open)
196 {
197 	struct file *filp;
198 	struct path path;
199 	int oflags;
200 
201 	oflags = O_CREAT | O_LARGEFILE;
202 	switch (open->op_share_access & NFS4_SHARE_ACCESS_BOTH) {
203 	case NFS4_SHARE_ACCESS_WRITE:
204 		oflags |= O_WRONLY;
205 		break;
206 	case NFS4_SHARE_ACCESS_BOTH:
207 		oflags |= O_RDWR;
208 		break;
209 	default:
210 		oflags |= O_RDONLY;
211 	}
212 
213 	path.mnt = fhp->fh_export->ex_path.mnt;
214 	path.dentry = child;
215 	filp = dentry_create(&path, oflags, open->op_iattr.ia_mode,
216 			     current_cred());
217 	if (IS_ERR(filp))
218 		return nfserrno(PTR_ERR(filp));
219 
220 	open->op_filp = filp;
221 	return nfs_ok;
222 }
223 
224 /*
225  * Implement NFSv4's unchecked, guarded, and exclusive create
226  * semantics for regular files. Open state for this new file is
227  * subsequently fabricated in nfsd4_process_open2().
228  *
229  * Upon return, caller must release @fhp and @resfhp.
230  */
231 static __be32
232 nfsd4_create_file(struct svc_rqst *rqstp, struct svc_fh *fhp,
233 		  struct svc_fh *resfhp, struct nfsd4_open *open)
234 {
235 	struct iattr *iap = &open->op_iattr;
236 	struct nfsd_attrs attrs = {
237 		.na_iattr	= iap,
238 		.na_seclabel	= &open->op_label,
239 	};
240 	struct dentry *parent, *child;
241 	__u32 v_mtime, v_atime;
242 	struct inode *inode;
243 	__be32 status;
244 	int host_err;
245 
246 	if (isdotent(open->op_fname, open->op_fnamelen))
247 		return nfserr_exist;
248 	if (!(iap->ia_valid & ATTR_MODE))
249 		iap->ia_mode = 0;
250 
251 	status = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC);
252 	if (status != nfs_ok)
253 		return status;
254 	parent = fhp->fh_dentry;
255 	inode = d_inode(parent);
256 
257 	host_err = fh_want_write(fhp);
258 	if (host_err)
259 		return nfserrno(host_err);
260 
261 	if (is_create_with_attrs(open))
262 		nfsd4_acl_to_attr(NF4REG, open->op_acl, &attrs);
263 
264 	inode_lock_nested(inode, I_MUTEX_PARENT);
265 
266 	child = lookup_one_len(open->op_fname, parent, open->op_fnamelen);
267 	if (IS_ERR(child)) {
268 		status = nfserrno(PTR_ERR(child));
269 		goto out;
270 	}
271 
272 	if (d_really_is_negative(child)) {
273 		status = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE);
274 		if (status != nfs_ok)
275 			goto out;
276 	}
277 
278 	status = fh_compose(resfhp, fhp->fh_export, child, fhp);
279 	if (status != nfs_ok)
280 		goto out;
281 
282 	v_mtime = 0;
283 	v_atime = 0;
284 	if (nfsd4_create_is_exclusive(open->op_createmode)) {
285 		u32 *verifier = (u32 *)open->op_verf.data;
286 
287 		/*
288 		 * Solaris 7 gets confused (bugid 4218508) if these have
289 		 * the high bit set, as do xfs filesystems without the
290 		 * "bigtime" feature. So just clear the high bits. If this
291 		 * is ever changed to use different attrs for storing the
292 		 * verifier, then do_open_lookup() will also need to be
293 		 * fixed accordingly.
294 		 */
295 		v_mtime = verifier[0] & 0x7fffffff;
296 		v_atime = verifier[1] & 0x7fffffff;
297 	}
298 
299 	if (d_really_is_positive(child)) {
300 		status = nfs_ok;
301 
302 		/* NFSv4 protocol requires change attributes even though
303 		 * no change happened.
304 		 */
305 		fh_fill_both_attrs(fhp);
306 
307 		switch (open->op_createmode) {
308 		case NFS4_CREATE_UNCHECKED:
309 			if (!d_is_reg(child))
310 				break;
311 
312 			/*
313 			 * In NFSv4, we don't want to truncate the file
314 			 * now. This would be wrong if the OPEN fails for
315 			 * some other reason. Furthermore, if the size is
316 			 * nonzero, we should ignore it according to spec!
317 			 */
318 			open->op_truncate = (iap->ia_valid & ATTR_SIZE) &&
319 						!iap->ia_size;
320 			break;
321 		case NFS4_CREATE_GUARDED:
322 			status = nfserr_exist;
323 			break;
324 		case NFS4_CREATE_EXCLUSIVE:
325 			if (d_inode(child)->i_mtime.tv_sec == v_mtime &&
326 			    d_inode(child)->i_atime.tv_sec == v_atime &&
327 			    d_inode(child)->i_size == 0) {
328 				open->op_created = true;
329 				break;		/* subtle */
330 			}
331 			status = nfserr_exist;
332 			break;
333 		case NFS4_CREATE_EXCLUSIVE4_1:
334 			if (d_inode(child)->i_mtime.tv_sec == v_mtime &&
335 			    d_inode(child)->i_atime.tv_sec == v_atime &&
336 			    d_inode(child)->i_size == 0) {
337 				open->op_created = true;
338 				goto set_attr;	/* subtle */
339 			}
340 			status = nfserr_exist;
341 		}
342 		goto out;
343 	}
344 
345 	if (!IS_POSIXACL(inode))
346 		iap->ia_mode &= ~current_umask();
347 
348 	fh_fill_pre_attrs(fhp);
349 	status = nfsd4_vfs_create(fhp, child, open);
350 	if (status != nfs_ok)
351 		goto out;
352 	open->op_created = true;
353 	fh_fill_post_attrs(fhp);
354 
355 	/* A newly created file already has a file size of zero. */
356 	if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0))
357 		iap->ia_valid &= ~ATTR_SIZE;
358 	if (nfsd4_create_is_exclusive(open->op_createmode)) {
359 		iap->ia_valid = ATTR_MTIME | ATTR_ATIME |
360 				ATTR_MTIME_SET|ATTR_ATIME_SET;
361 		iap->ia_mtime.tv_sec = v_mtime;
362 		iap->ia_atime.tv_sec = v_atime;
363 		iap->ia_mtime.tv_nsec = 0;
364 		iap->ia_atime.tv_nsec = 0;
365 	}
366 
367 set_attr:
368 	status = nfsd_create_setattr(rqstp, fhp, resfhp, &attrs);
369 
370 	if (attrs.na_labelerr)
371 		open->op_bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
372 	if (attrs.na_aclerr)
373 		open->op_bmval[0] &= ~FATTR4_WORD0_ACL;
374 out:
375 	inode_unlock(inode);
376 	nfsd_attrs_free(&attrs);
377 	if (child && !IS_ERR(child))
378 		dput(child);
379 	fh_drop_write(fhp);
380 	return status;
381 }
382 
383 static __be32
384 do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh **resfh)
385 {
386 	struct svc_fh *current_fh = &cstate->current_fh;
387 	int accmode;
388 	__be32 status;
389 
390 	*resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
391 	if (!*resfh)
392 		return nfserr_jukebox;
393 	fh_init(*resfh, NFS4_FHSIZE);
394 	open->op_truncate = false;
395 
396 	if (open->op_create) {
397 		/* FIXME: check session persistence and pnfs flags.
398 		 * The nfsv4.1 spec requires the following semantics:
399 		 *
400 		 * Persistent   | pNFS   | Server REQUIRED | Client Allowed
401 		 * Reply Cache  | server |                 |
402 		 * -------------+--------+-----------------+--------------------
403 		 * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
404 		 *              |        |                 | (SHOULD)
405 		 *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
406 		 *              |        |                 | (SHOULD NOT)
407 		 * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
408 		 * yes          | no     | GUARDED4        | GUARDED4
409 		 * yes          | yes    | GUARDED4        | GUARDED4
410 		 */
411 
412 		current->fs->umask = open->op_umask;
413 		status = nfsd4_create_file(rqstp, current_fh, *resfh, open);
414 		current->fs->umask = 0;
415 
416 		/*
417 		 * Following rfc 3530 14.2.16, and rfc 5661 18.16.4
418 		 * use the returned bitmask to indicate which attributes
419 		 * we used to store the verifier:
420 		 */
421 		if (nfsd4_create_is_exclusive(open->op_createmode) && status == 0)
422 			open->op_bmval[1] |= (FATTR4_WORD1_TIME_ACCESS |
423 						FATTR4_WORD1_TIME_MODIFY);
424 	} else {
425 		status = nfsd_lookup(rqstp, current_fh,
426 				     open->op_fname, open->op_fnamelen, *resfh);
427 		if (!status)
428 			/* NFSv4 protocol requires change attributes even though
429 			 * no change happened.
430 			 */
431 			fh_fill_both_attrs(current_fh);
432 	}
433 	if (status)
434 		goto out;
435 	status = nfsd_check_obj_isreg(*resfh);
436 	if (status)
437 		goto out;
438 
439 	nfsd4_set_open_owner_reply_cache(cstate, open, *resfh);
440 	accmode = NFSD_MAY_NOP;
441 	if (open->op_created ||
442 			open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
443 		accmode |= NFSD_MAY_OWNER_OVERRIDE;
444 	status = do_open_permission(rqstp, *resfh, open, accmode);
445 	set_change_info(&open->op_cinfo, current_fh);
446 out:
447 	return status;
448 }
449 
450 static __be32
451 do_open_fhandle(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
452 {
453 	struct svc_fh *current_fh = &cstate->current_fh;
454 	int accmode = 0;
455 
456 	/* We don't know the target directory, and therefore can not
457 	* set the change info
458 	*/
459 
460 	memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
461 
462 	nfsd4_set_open_owner_reply_cache(cstate, open, current_fh);
463 
464 	open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
465 		(open->op_iattr.ia_size == 0);
466 	/*
467 	 * In the delegation case, the client is telling us about an
468 	 * open that it *already* performed locally, some time ago.  We
469 	 * should let it succeed now if possible.
470 	 *
471 	 * In the case of a CLAIM_FH open, on the other hand, the client
472 	 * may be counting on us to enforce permissions (the Linux 4.1
473 	 * client uses this for normal opens, for example).
474 	 */
475 	if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
476 		accmode = NFSD_MAY_OWNER_OVERRIDE;
477 
478 	return do_open_permission(rqstp, current_fh, open, accmode);
479 }
480 
481 static void
482 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
483 {
484 	struct nfsd4_sessionid *sid =
485 			(struct nfsd4_sessionid *)session->se_sessionid.data;
486 
487 	clid->cl_boot = sid->clientid.cl_boot;
488 	clid->cl_id = sid->clientid.cl_id;
489 }
490 
491 static __be32
492 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
493 	   union nfsd4_op_u *u)
494 {
495 	struct nfsd4_open *open = &u->open;
496 	__be32 status;
497 	struct svc_fh *resfh = NULL;
498 	struct net *net = SVC_NET(rqstp);
499 	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
500 	bool reclaim = false;
501 
502 	dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
503 		(int)open->op_fnamelen, open->op_fname,
504 		open->op_openowner);
505 
506 	open->op_filp = NULL;
507 	open->op_rqstp = rqstp;
508 
509 	/* This check required by spec. */
510 	if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
511 		return nfserr_inval;
512 
513 	open->op_created = false;
514 	/*
515 	 * RFC5661 18.51.3
516 	 * Before RECLAIM_COMPLETE done, server should deny new lock
517 	 */
518 	if (nfsd4_has_session(cstate) &&
519 	    !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &cstate->clp->cl_flags) &&
520 	    open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
521 		return nfserr_grace;
522 
523 	if (nfsd4_has_session(cstate))
524 		copy_clientid(&open->op_clientid, cstate->session);
525 
526 	/* check seqid for replay. set nfs4_owner */
527 	status = nfsd4_process_open1(cstate, open, nn);
528 	if (status == nfserr_replay_me) {
529 		struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
530 		fh_put(&cstate->current_fh);
531 		fh_copy_shallow(&cstate->current_fh.fh_handle,
532 				&rp->rp_openfh);
533 		status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
534 		if (status)
535 			dprintk("nfsd4_open: replay failed"
536 				" restoring previous filehandle\n");
537 		else
538 			status = nfserr_replay_me;
539 	}
540 	if (status)
541 		goto out;
542 	if (open->op_xdr_error) {
543 		status = open->op_xdr_error;
544 		goto out;
545 	}
546 
547 	status = nfsd4_check_open_attributes(rqstp, cstate, open);
548 	if (status)
549 		goto out;
550 
551 	/* Openowner is now set, so sequence id will get bumped.  Now we need
552 	 * these checks before we do any creates: */
553 	status = nfserr_grace;
554 	if (opens_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
555 		goto out;
556 	status = nfserr_no_grace;
557 	if (!opens_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
558 		goto out;
559 
560 	switch (open->op_claim_type) {
561 	case NFS4_OPEN_CLAIM_DELEGATE_CUR:
562 	case NFS4_OPEN_CLAIM_NULL:
563 		status = do_open_lookup(rqstp, cstate, open, &resfh);
564 		if (status)
565 			goto out;
566 		break;
567 	case NFS4_OPEN_CLAIM_PREVIOUS:
568 		status = nfs4_check_open_reclaim(cstate->clp);
569 		if (status)
570 			goto out;
571 		open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
572 		reclaim = true;
573 		fallthrough;
574 	case NFS4_OPEN_CLAIM_FH:
575 	case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
576 		status = do_open_fhandle(rqstp, cstate, open);
577 		if (status)
578 			goto out;
579 		resfh = &cstate->current_fh;
580 		break;
581 	case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
582 	case NFS4_OPEN_CLAIM_DELEGATE_PREV:
583 		status = nfserr_notsupp;
584 		goto out;
585 	default:
586 		status = nfserr_inval;
587 		goto out;
588 	}
589 
590 	status = nfsd4_process_open2(rqstp, resfh, open);
591 	if (status && open->op_created)
592 		pr_warn("nfsd4_process_open2 failed to open newly-created file: status=%u\n",
593 			be32_to_cpu(status));
594 	if (reclaim && !status)
595 		nn->somebody_reclaimed = true;
596 out:
597 	if (open->op_filp) {
598 		fput(open->op_filp);
599 		open->op_filp = NULL;
600 	}
601 	if (resfh && resfh != &cstate->current_fh) {
602 		fh_dup2(&cstate->current_fh, resfh);
603 		fh_put(resfh);
604 		kfree(resfh);
605 	}
606 	nfsd4_cleanup_open_state(cstate, open);
607 	nfsd4_bump_seqid(cstate, status);
608 	return status;
609 }
610 
611 /*
612  * OPEN is the only seqid-mutating operation whose decoding can fail
613  * with a seqid-mutating error (specifically, decoding of user names in
614  * the attributes).  Therefore we have to do some processing to look up
615  * the stateowner so that we can bump the seqid.
616  */
617 static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
618 {
619 	struct nfsd4_open *open = &op->u.open;
620 
621 	if (!seqid_mutating_err(ntohl(op->status)))
622 		return op->status;
623 	if (nfsd4_has_session(cstate))
624 		return op->status;
625 	open->op_xdr_error = op->status;
626 	return nfsd4_open(rqstp, cstate, &op->u);
627 }
628 
629 /*
630  * filehandle-manipulating ops.
631  */
632 static __be32
633 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
634 	    union nfsd4_op_u *u)
635 {
636 	u->getfh = &cstate->current_fh;
637 	return nfs_ok;
638 }
639 
640 static __be32
641 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
642 	    union nfsd4_op_u *u)
643 {
644 	struct nfsd4_putfh *putfh = &u->putfh;
645 	__be32 ret;
646 
647 	fh_put(&cstate->current_fh);
648 	cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
649 	memcpy(&cstate->current_fh.fh_handle.fh_raw, putfh->pf_fhval,
650 	       putfh->pf_fhlen);
651 	ret = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
652 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
653 	if (ret == nfserr_stale && putfh->no_verify) {
654 		SET_FH_FLAG(&cstate->current_fh, NFSD4_FH_FOREIGN);
655 		ret = 0;
656 	}
657 #endif
658 	return ret;
659 }
660 
661 static __be32
662 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
663 		union nfsd4_op_u *u)
664 {
665 	fh_put(&cstate->current_fh);
666 
667 	return exp_pseudoroot(rqstp, &cstate->current_fh);
668 }
669 
670 static __be32
671 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
672 		union nfsd4_op_u *u)
673 {
674 	if (!cstate->save_fh.fh_dentry)
675 		return nfserr_restorefh;
676 
677 	fh_dup2(&cstate->current_fh, &cstate->save_fh);
678 	if (HAS_CSTATE_FLAG(cstate, SAVED_STATE_ID_FLAG)) {
679 		memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
680 		SET_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG);
681 	}
682 	return nfs_ok;
683 }
684 
685 static __be32
686 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
687 	     union nfsd4_op_u *u)
688 {
689 	fh_dup2(&cstate->save_fh, &cstate->current_fh);
690 	if (HAS_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG)) {
691 		memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
692 		SET_CSTATE_FLAG(cstate, SAVED_STATE_ID_FLAG);
693 	}
694 	return nfs_ok;
695 }
696 
697 /*
698  * misc nfsv4 ops
699  */
700 static __be32
701 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
702 	     union nfsd4_op_u *u)
703 {
704 	struct nfsd4_access *access = &u->access;
705 	u32 access_full;
706 
707 	access_full = NFS3_ACCESS_FULL;
708 	if (cstate->minorversion >= 2)
709 		access_full |= NFS4_ACCESS_XALIST | NFS4_ACCESS_XAREAD |
710 			       NFS4_ACCESS_XAWRITE;
711 
712 	if (access->ac_req_access & ~access_full)
713 		return nfserr_inval;
714 
715 	access->ac_resp_access = access->ac_req_access;
716 	return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
717 			   &access->ac_supported);
718 }
719 
720 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
721 {
722 	__be32 *verf = (__be32 *)verifier->data;
723 
724 	BUILD_BUG_ON(2*sizeof(*verf) != sizeof(verifier->data));
725 
726 	nfsd_copy_write_verifier(verf, net_generic(net, nfsd_net_id));
727 }
728 
729 static __be32
730 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
731 	     union nfsd4_op_u *u)
732 {
733 	struct nfsd4_commit *commit = &u->commit;
734 	struct nfsd_file *nf;
735 	__be32 status;
736 
737 	status = nfsd_file_acquire(rqstp, &cstate->current_fh, NFSD_MAY_WRITE |
738 				   NFSD_MAY_NOT_BREAK_LEASE, &nf);
739 	if (status != nfs_ok)
740 		return status;
741 
742 	status = nfsd_commit(rqstp, &cstate->current_fh, nf, commit->co_offset,
743 			     commit->co_count,
744 			     (__be32 *)commit->co_verf.data);
745 	nfsd_file_put(nf);
746 	return status;
747 }
748 
749 static __be32
750 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
751 	     union nfsd4_op_u *u)
752 {
753 	struct nfsd4_create *create = &u->create;
754 	struct nfsd_attrs attrs = {
755 		.na_iattr	= &create->cr_iattr,
756 		.na_seclabel	= &create->cr_label,
757 	};
758 	struct svc_fh resfh;
759 	__be32 status;
760 	dev_t rdev;
761 
762 	fh_init(&resfh, NFS4_FHSIZE);
763 
764 	status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_NOP);
765 	if (status)
766 		return status;
767 
768 	status = check_attr_support(rqstp, cstate, create->cr_bmval,
769 				    nfsd_attrmask);
770 	if (status)
771 		return status;
772 
773 	status = nfsd4_acl_to_attr(create->cr_type, create->cr_acl, &attrs);
774 	current->fs->umask = create->cr_umask;
775 	switch (create->cr_type) {
776 	case NF4LNK:
777 		status = nfsd_symlink(rqstp, &cstate->current_fh,
778 				      create->cr_name, create->cr_namelen,
779 				      create->cr_data, &attrs, &resfh);
780 		break;
781 
782 	case NF4BLK:
783 		status = nfserr_inval;
784 		rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
785 		if (MAJOR(rdev) != create->cr_specdata1 ||
786 		    MINOR(rdev) != create->cr_specdata2)
787 			goto out_umask;
788 		status = nfsd_create(rqstp, &cstate->current_fh,
789 				     create->cr_name, create->cr_namelen,
790 				     &attrs, S_IFBLK, rdev, &resfh);
791 		break;
792 
793 	case NF4CHR:
794 		status = nfserr_inval;
795 		rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
796 		if (MAJOR(rdev) != create->cr_specdata1 ||
797 		    MINOR(rdev) != create->cr_specdata2)
798 			goto out_umask;
799 		status = nfsd_create(rqstp, &cstate->current_fh,
800 				     create->cr_name, create->cr_namelen,
801 				     &attrs, S_IFCHR, rdev, &resfh);
802 		break;
803 
804 	case NF4SOCK:
805 		status = nfsd_create(rqstp, &cstate->current_fh,
806 				     create->cr_name, create->cr_namelen,
807 				     &attrs, S_IFSOCK, 0, &resfh);
808 		break;
809 
810 	case NF4FIFO:
811 		status = nfsd_create(rqstp, &cstate->current_fh,
812 				     create->cr_name, create->cr_namelen,
813 				     &attrs, S_IFIFO, 0, &resfh);
814 		break;
815 
816 	case NF4DIR:
817 		create->cr_iattr.ia_valid &= ~ATTR_SIZE;
818 		status = nfsd_create(rqstp, &cstate->current_fh,
819 				     create->cr_name, create->cr_namelen,
820 				     &attrs, S_IFDIR, 0, &resfh);
821 		break;
822 
823 	default:
824 		status = nfserr_badtype;
825 	}
826 
827 	if (status)
828 		goto out;
829 
830 	if (attrs.na_labelerr)
831 		create->cr_bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
832 	if (attrs.na_aclerr)
833 		create->cr_bmval[0] &= ~FATTR4_WORD0_ACL;
834 	set_change_info(&create->cr_cinfo, &cstate->current_fh);
835 	fh_dup2(&cstate->current_fh, &resfh);
836 out:
837 	fh_put(&resfh);
838 out_umask:
839 	current->fs->umask = 0;
840 	nfsd_attrs_free(&attrs);
841 	return status;
842 }
843 
844 static __be32
845 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
846 	      union nfsd4_op_u *u)
847 {
848 	struct nfsd4_getattr *getattr = &u->getattr;
849 	__be32 status;
850 
851 	status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
852 	if (status)
853 		return status;
854 
855 	if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
856 		return nfserr_inval;
857 
858 	getattr->ga_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
859 	getattr->ga_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
860 	getattr->ga_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
861 
862 	getattr->ga_fhp = &cstate->current_fh;
863 	return nfs_ok;
864 }
865 
866 static __be32
867 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
868 	   union nfsd4_op_u *u)
869 {
870 	struct nfsd4_link *link = &u->link;
871 	__be32 status;
872 
873 	status = nfsd_link(rqstp, &cstate->current_fh,
874 			   link->li_name, link->li_namelen, &cstate->save_fh);
875 	if (!status)
876 		set_change_info(&link->li_cinfo, &cstate->current_fh);
877 	return status;
878 }
879 
880 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
881 {
882 	struct svc_fh tmp_fh;
883 	__be32 ret;
884 
885 	fh_init(&tmp_fh, NFS4_FHSIZE);
886 	ret = exp_pseudoroot(rqstp, &tmp_fh);
887 	if (ret)
888 		return ret;
889 	if (tmp_fh.fh_dentry == fh->fh_dentry) {
890 		fh_put(&tmp_fh);
891 		return nfserr_noent;
892 	}
893 	fh_put(&tmp_fh);
894 	return nfsd_lookup(rqstp, fh, "..", 2, fh);
895 }
896 
897 static __be32
898 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
899 	      union nfsd4_op_u *u)
900 {
901 	return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
902 }
903 
904 static __be32
905 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
906 	     union nfsd4_op_u *u)
907 {
908 	return nfsd_lookup(rqstp, &cstate->current_fh,
909 			   u->lookup.lo_name, u->lookup.lo_len,
910 			   &cstate->current_fh);
911 }
912 
913 static __be32
914 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
915 	   union nfsd4_op_u *u)
916 {
917 	struct nfsd4_read *read = &u->read;
918 	__be32 status;
919 
920 	read->rd_nf = NULL;
921 
922 	trace_nfsd_read_start(rqstp, &cstate->current_fh,
923 			      read->rd_offset, read->rd_length);
924 
925 	read->rd_length = min_t(u32, read->rd_length, svc_max_payload(rqstp));
926 	if (read->rd_offset > (u64)OFFSET_MAX)
927 		read->rd_offset = (u64)OFFSET_MAX;
928 	if (read->rd_offset + read->rd_length > (u64)OFFSET_MAX)
929 		read->rd_length = (u64)OFFSET_MAX - read->rd_offset;
930 
931 	/*
932 	 * If we do a zero copy read, then a client will see read data
933 	 * that reflects the state of the file *after* performing the
934 	 * following compound.
935 	 *
936 	 * To ensure proper ordering, we therefore turn off zero copy if
937 	 * the client wants us to do more in this compound:
938 	 */
939 	if (!nfsd4_last_compound_op(rqstp))
940 		clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
941 
942 	/* check stateid */
943 	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
944 					&read->rd_stateid, RD_STATE,
945 					&read->rd_nf, NULL);
946 
947 	read->rd_rqstp = rqstp;
948 	read->rd_fhp = &cstate->current_fh;
949 	return status;
950 }
951 
952 
953 static void
954 nfsd4_read_release(union nfsd4_op_u *u)
955 {
956 	if (u->read.rd_nf)
957 		nfsd_file_put(u->read.rd_nf);
958 	trace_nfsd_read_done(u->read.rd_rqstp, u->read.rd_fhp,
959 			     u->read.rd_offset, u->read.rd_length);
960 }
961 
962 static __be32
963 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
964 	      union nfsd4_op_u *u)
965 {
966 	struct nfsd4_readdir *readdir = &u->readdir;
967 	u64 cookie = readdir->rd_cookie;
968 	static const nfs4_verifier zeroverf;
969 
970 	/* no need to check permission - this will be done in nfsd_readdir() */
971 
972 	if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
973 		return nfserr_inval;
974 
975 	readdir->rd_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
976 	readdir->rd_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
977 	readdir->rd_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
978 
979 	if ((cookie == 1) || (cookie == 2) ||
980 	    (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
981 		return nfserr_bad_cookie;
982 
983 	readdir->rd_rqstp = rqstp;
984 	readdir->rd_fhp = &cstate->current_fh;
985 	return nfs_ok;
986 }
987 
988 static __be32
989 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
990 	       union nfsd4_op_u *u)
991 {
992 	u->readlink.rl_rqstp = rqstp;
993 	u->readlink.rl_fhp = &cstate->current_fh;
994 	return nfs_ok;
995 }
996 
997 static __be32
998 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
999 	     union nfsd4_op_u *u)
1000 {
1001 	struct nfsd4_remove *remove = &u->remove;
1002 	__be32 status;
1003 
1004 	if (opens_in_grace(SVC_NET(rqstp)))
1005 		return nfserr_grace;
1006 	status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
1007 			     remove->rm_name, remove->rm_namelen);
1008 	if (!status)
1009 		set_change_info(&remove->rm_cinfo, &cstate->current_fh);
1010 	return status;
1011 }
1012 
1013 static __be32
1014 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1015 	     union nfsd4_op_u *u)
1016 {
1017 	struct nfsd4_rename *rename = &u->rename;
1018 	__be32 status;
1019 
1020 	if (opens_in_grace(SVC_NET(rqstp)))
1021 		return nfserr_grace;
1022 	status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
1023 			     rename->rn_snamelen, &cstate->current_fh,
1024 			     rename->rn_tname, rename->rn_tnamelen);
1025 	if (status)
1026 		return status;
1027 	set_change_info(&rename->rn_sinfo, &cstate->current_fh);
1028 	set_change_info(&rename->rn_tinfo, &cstate->save_fh);
1029 	return nfs_ok;
1030 }
1031 
1032 static __be32
1033 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1034 	      union nfsd4_op_u *u)
1035 {
1036 	struct nfsd4_secinfo *secinfo = &u->secinfo;
1037 	struct svc_export *exp;
1038 	struct dentry *dentry;
1039 	__be32 err;
1040 
1041 	err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
1042 	if (err)
1043 		return err;
1044 	err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
1045 				    secinfo->si_name, secinfo->si_namelen,
1046 				    &exp, &dentry);
1047 	if (err)
1048 		return err;
1049 	if (d_really_is_negative(dentry)) {
1050 		exp_put(exp);
1051 		err = nfserr_noent;
1052 	} else
1053 		secinfo->si_exp = exp;
1054 	dput(dentry);
1055 	if (cstate->minorversion)
1056 		/* See rfc 5661 section 2.6.3.1.1.8 */
1057 		fh_put(&cstate->current_fh);
1058 	return err;
1059 }
1060 
1061 static __be32
1062 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1063 		union nfsd4_op_u *u)
1064 {
1065 	__be32 err;
1066 
1067 	switch (u->secinfo_no_name.sin_style) {
1068 	case NFS4_SECINFO_STYLE4_CURRENT_FH:
1069 		break;
1070 	case NFS4_SECINFO_STYLE4_PARENT:
1071 		err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
1072 		if (err)
1073 			return err;
1074 		break;
1075 	default:
1076 		return nfserr_inval;
1077 	}
1078 
1079 	u->secinfo_no_name.sin_exp = exp_get(cstate->current_fh.fh_export);
1080 	fh_put(&cstate->current_fh);
1081 	return nfs_ok;
1082 }
1083 
1084 static void
1085 nfsd4_secinfo_release(union nfsd4_op_u *u)
1086 {
1087 	if (u->secinfo.si_exp)
1088 		exp_put(u->secinfo.si_exp);
1089 }
1090 
1091 static void
1092 nfsd4_secinfo_no_name_release(union nfsd4_op_u *u)
1093 {
1094 	if (u->secinfo_no_name.sin_exp)
1095 		exp_put(u->secinfo_no_name.sin_exp);
1096 }
1097 
1098 static __be32
1099 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1100 	      union nfsd4_op_u *u)
1101 {
1102 	struct nfsd4_setattr *setattr = &u->setattr;
1103 	struct nfsd_attrs attrs = {
1104 		.na_iattr	= &setattr->sa_iattr,
1105 		.na_seclabel	= &setattr->sa_label,
1106 	};
1107 	struct inode *inode;
1108 	__be32 status = nfs_ok;
1109 	int err;
1110 
1111 	if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
1112 		status = nfs4_preprocess_stateid_op(rqstp, cstate,
1113 				&cstate->current_fh, &setattr->sa_stateid,
1114 				WR_STATE, NULL, NULL);
1115 		if (status)
1116 			return status;
1117 	}
1118 	err = fh_want_write(&cstate->current_fh);
1119 	if (err)
1120 		return nfserrno(err);
1121 	status = nfs_ok;
1122 
1123 	status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
1124 				    nfsd_attrmask);
1125 	if (status)
1126 		goto out;
1127 
1128 	inode = cstate->current_fh.fh_dentry->d_inode;
1129 	status = nfsd4_acl_to_attr(S_ISDIR(inode->i_mode) ? NF4DIR : NF4REG,
1130 				   setattr->sa_acl, &attrs);
1131 
1132 	if (status)
1133 		goto out;
1134 	status = nfsd_setattr(rqstp, &cstate->current_fh, &attrs,
1135 				0, (time64_t)0);
1136 	if (!status)
1137 		status = nfserrno(attrs.na_labelerr);
1138 	if (!status)
1139 		status = nfserrno(attrs.na_aclerr);
1140 out:
1141 	nfsd_attrs_free(&attrs);
1142 	fh_drop_write(&cstate->current_fh);
1143 	return status;
1144 }
1145 
1146 static __be32
1147 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1148 	    union nfsd4_op_u *u)
1149 {
1150 	struct nfsd4_write *write = &u->write;
1151 	stateid_t *stateid = &write->wr_stateid;
1152 	struct nfsd_file *nf = NULL;
1153 	__be32 status = nfs_ok;
1154 	unsigned long cnt;
1155 	int nvecs;
1156 
1157 	if (write->wr_offset > (u64)OFFSET_MAX ||
1158 	    write->wr_offset + write->wr_buflen > (u64)OFFSET_MAX)
1159 		return nfserr_fbig;
1160 
1161 	cnt = write->wr_buflen;
1162 	trace_nfsd_write_start(rqstp, &cstate->current_fh,
1163 			       write->wr_offset, cnt);
1164 	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1165 						stateid, WR_STATE, &nf, NULL);
1166 	if (status)
1167 		return status;
1168 
1169 	write->wr_how_written = write->wr_stable_how;
1170 
1171 	nvecs = svc_fill_write_vector(rqstp, &write->wr_payload);
1172 	WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1173 
1174 	status = nfsd_vfs_write(rqstp, &cstate->current_fh, nf,
1175 				write->wr_offset, rqstp->rq_vec, nvecs, &cnt,
1176 				write->wr_how_written,
1177 				(__be32 *)write->wr_verifier.data);
1178 	nfsd_file_put(nf);
1179 
1180 	write->wr_bytes_written = cnt;
1181 	trace_nfsd_write_done(rqstp, &cstate->current_fh,
1182 			      write->wr_offset, cnt);
1183 	return status;
1184 }
1185 
1186 static __be32
1187 nfsd4_verify_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1188 		  stateid_t *src_stateid, struct nfsd_file **src,
1189 		  stateid_t *dst_stateid, struct nfsd_file **dst)
1190 {
1191 	__be32 status;
1192 
1193 	if (!cstate->save_fh.fh_dentry)
1194 		return nfserr_nofilehandle;
1195 
1196 	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->save_fh,
1197 					    src_stateid, RD_STATE, src, NULL);
1198 	if (status)
1199 		goto out;
1200 
1201 	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1202 					    dst_stateid, WR_STATE, dst, NULL);
1203 	if (status)
1204 		goto out_put_src;
1205 
1206 	/* fix up for NFS-specific error code */
1207 	if (!S_ISREG(file_inode((*src)->nf_file)->i_mode) ||
1208 	    !S_ISREG(file_inode((*dst)->nf_file)->i_mode)) {
1209 		status = nfserr_wrong_type;
1210 		goto out_put_dst;
1211 	}
1212 
1213 out:
1214 	return status;
1215 out_put_dst:
1216 	nfsd_file_put(*dst);
1217 	*dst = NULL;
1218 out_put_src:
1219 	nfsd_file_put(*src);
1220 	*src = NULL;
1221 	goto out;
1222 }
1223 
1224 static __be32
1225 nfsd4_clone(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1226 		union nfsd4_op_u *u)
1227 {
1228 	struct nfsd4_clone *clone = &u->clone;
1229 	struct nfsd_file *src, *dst;
1230 	__be32 status;
1231 
1232 	status = nfsd4_verify_copy(rqstp, cstate, &clone->cl_src_stateid, &src,
1233 				   &clone->cl_dst_stateid, &dst);
1234 	if (status)
1235 		goto out;
1236 
1237 	status = nfsd4_clone_file_range(rqstp, src, clone->cl_src_pos,
1238 			dst, clone->cl_dst_pos, clone->cl_count,
1239 			EX_ISSYNC(cstate->current_fh.fh_export));
1240 
1241 	nfsd_file_put(dst);
1242 	nfsd_file_put(src);
1243 out:
1244 	return status;
1245 }
1246 
1247 static void nfs4_put_copy(struct nfsd4_copy *copy)
1248 {
1249 	if (!refcount_dec_and_test(&copy->refcount))
1250 		return;
1251 	kfree(copy->cp_src);
1252 	kfree(copy);
1253 }
1254 
1255 static void nfsd4_stop_copy(struct nfsd4_copy *copy)
1256 {
1257 	if (!test_and_set_bit(NFSD4_COPY_F_STOPPED, &copy->cp_flags))
1258 		kthread_stop(copy->copy_task);
1259 	nfs4_put_copy(copy);
1260 }
1261 
1262 static struct nfsd4_copy *nfsd4_get_copy(struct nfs4_client *clp)
1263 {
1264 	struct nfsd4_copy *copy = NULL;
1265 
1266 	spin_lock(&clp->async_lock);
1267 	if (!list_empty(&clp->async_copies)) {
1268 		copy = list_first_entry(&clp->async_copies, struct nfsd4_copy,
1269 					copies);
1270 		refcount_inc(&copy->refcount);
1271 	}
1272 	spin_unlock(&clp->async_lock);
1273 	return copy;
1274 }
1275 
1276 void nfsd4_shutdown_copy(struct nfs4_client *clp)
1277 {
1278 	struct nfsd4_copy *copy;
1279 
1280 	while ((copy = nfsd4_get_copy(clp)) != NULL)
1281 		nfsd4_stop_copy(copy);
1282 }
1283 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
1284 
1285 extern struct file *nfs42_ssc_open(struct vfsmount *ss_mnt,
1286 				   struct nfs_fh *src_fh,
1287 				   nfs4_stateid *stateid);
1288 extern void nfs42_ssc_close(struct file *filep);
1289 
1290 extern void nfs_sb_deactive(struct super_block *sb);
1291 
1292 #define NFSD42_INTERSSC_MOUNTOPS "vers=4.2,addr=%s,sec=sys"
1293 
1294 /*
1295  * setup a work entry in the ssc delayed unmount list.
1296  */
1297 static __be32 nfsd4_ssc_setup_dul(struct nfsd_net *nn, char *ipaddr,
1298 				  struct nfsd4_ssc_umount_item **nsui)
1299 {
1300 	struct nfsd4_ssc_umount_item *ni = NULL;
1301 	struct nfsd4_ssc_umount_item *work = NULL;
1302 	struct nfsd4_ssc_umount_item *tmp;
1303 	DEFINE_WAIT(wait);
1304 	__be32 status = 0;
1305 
1306 	*nsui = NULL;
1307 	work = kzalloc(sizeof(*work), GFP_KERNEL);
1308 try_again:
1309 	spin_lock(&nn->nfsd_ssc_lock);
1310 	list_for_each_entry_safe(ni, tmp, &nn->nfsd_ssc_mount_list, nsui_list) {
1311 		if (strncmp(ni->nsui_ipaddr, ipaddr, sizeof(ni->nsui_ipaddr)))
1312 			continue;
1313 		/* found a match */
1314 		if (ni->nsui_busy) {
1315 			/*  wait - and try again */
1316 			prepare_to_wait(&nn->nfsd_ssc_waitq, &wait,
1317 				TASK_INTERRUPTIBLE);
1318 			spin_unlock(&nn->nfsd_ssc_lock);
1319 
1320 			/* allow 20secs for mount/unmount for now - revisit */
1321 			if (signal_pending(current) ||
1322 					(schedule_timeout(20*HZ) == 0)) {
1323 				finish_wait(&nn->nfsd_ssc_waitq, &wait);
1324 				kfree(work);
1325 				return nfserr_eagain;
1326 			}
1327 			finish_wait(&nn->nfsd_ssc_waitq, &wait);
1328 			goto try_again;
1329 		}
1330 		*nsui = ni;
1331 		refcount_inc(&ni->nsui_refcnt);
1332 		spin_unlock(&nn->nfsd_ssc_lock);
1333 		kfree(work);
1334 
1335 		/* return vfsmount in (*nsui)->nsui_vfsmount */
1336 		return 0;
1337 	}
1338 	if (work) {
1339 		strscpy(work->nsui_ipaddr, ipaddr, sizeof(work->nsui_ipaddr) - 1);
1340 		refcount_set(&work->nsui_refcnt, 2);
1341 		work->nsui_busy = true;
1342 		list_add_tail(&work->nsui_list, &nn->nfsd_ssc_mount_list);
1343 		*nsui = work;
1344 	} else
1345 		status = nfserr_resource;
1346 	spin_unlock(&nn->nfsd_ssc_lock);
1347 	return status;
1348 }
1349 
1350 static void nfsd4_ssc_update_dul(struct nfsd_net *nn,
1351 				 struct nfsd4_ssc_umount_item *nsui,
1352 				 struct vfsmount *ss_mnt)
1353 {
1354 	spin_lock(&nn->nfsd_ssc_lock);
1355 	nsui->nsui_vfsmount = ss_mnt;
1356 	nsui->nsui_busy = false;
1357 	wake_up_all(&nn->nfsd_ssc_waitq);
1358 	spin_unlock(&nn->nfsd_ssc_lock);
1359 }
1360 
1361 static void nfsd4_ssc_cancel_dul(struct nfsd_net *nn,
1362 				 struct nfsd4_ssc_umount_item *nsui)
1363 {
1364 	spin_lock(&nn->nfsd_ssc_lock);
1365 	list_del(&nsui->nsui_list);
1366 	wake_up_all(&nn->nfsd_ssc_waitq);
1367 	spin_unlock(&nn->nfsd_ssc_lock);
1368 	kfree(nsui);
1369 }
1370 
1371 /*
1372  * Support one copy source server for now.
1373  */
1374 static __be32
1375 nfsd4_interssc_connect(struct nl4_server *nss, struct svc_rqst *rqstp,
1376 		       struct nfsd4_ssc_umount_item **nsui)
1377 {
1378 	struct file_system_type *type;
1379 	struct vfsmount *ss_mnt;
1380 	struct nfs42_netaddr *naddr;
1381 	struct sockaddr_storage tmp_addr;
1382 	size_t tmp_addrlen, match_netid_len = 3;
1383 	char *startsep = "", *endsep = "", *match_netid = "tcp";
1384 	char *ipaddr, *dev_name, *raw_data;
1385 	int len, raw_len;
1386 	__be32 status = nfserr_inval;
1387 	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1388 
1389 	naddr = &nss->u.nl4_addr;
1390 	tmp_addrlen = rpc_uaddr2sockaddr(SVC_NET(rqstp), naddr->addr,
1391 					 naddr->addr_len,
1392 					 (struct sockaddr *)&tmp_addr,
1393 					 sizeof(tmp_addr));
1394 	*nsui = NULL;
1395 	if (tmp_addrlen == 0)
1396 		goto out_err;
1397 
1398 	if (tmp_addr.ss_family == AF_INET6) {
1399 		startsep = "[";
1400 		endsep = "]";
1401 		match_netid = "tcp6";
1402 		match_netid_len = 4;
1403 	}
1404 
1405 	if (naddr->netid_len != match_netid_len ||
1406 		strncmp(naddr->netid, match_netid, naddr->netid_len))
1407 		goto out_err;
1408 
1409 	/* Construct the raw data for the vfs_kern_mount call */
1410 	len = RPC_MAX_ADDRBUFLEN + 1;
1411 	ipaddr = kzalloc(len, GFP_KERNEL);
1412 	if (!ipaddr)
1413 		goto out_err;
1414 
1415 	rpc_ntop((struct sockaddr *)&tmp_addr, ipaddr, len);
1416 
1417 	/* 2 for ipv6 endsep and startsep. 3 for ":/" and trailing '/0'*/
1418 
1419 	raw_len = strlen(NFSD42_INTERSSC_MOUNTOPS) + strlen(ipaddr);
1420 	raw_data = kzalloc(raw_len, GFP_KERNEL);
1421 	if (!raw_data)
1422 		goto out_free_ipaddr;
1423 
1424 	snprintf(raw_data, raw_len, NFSD42_INTERSSC_MOUNTOPS, ipaddr);
1425 
1426 	status = nfserr_nodev;
1427 	type = get_fs_type("nfs");
1428 	if (!type)
1429 		goto out_free_rawdata;
1430 
1431 	/* Set the server:<export> for the vfs_kern_mount call */
1432 	dev_name = kzalloc(len + 5, GFP_KERNEL);
1433 	if (!dev_name)
1434 		goto out_free_rawdata;
1435 	snprintf(dev_name, len + 5, "%s%s%s:/", startsep, ipaddr, endsep);
1436 
1437 	status = nfsd4_ssc_setup_dul(nn, ipaddr, nsui);
1438 	if (status)
1439 		goto out_free_devname;
1440 	if ((*nsui)->nsui_vfsmount)
1441 		goto out_done;
1442 
1443 	/* Use an 'internal' mount: SB_KERNMOUNT -> MNT_INTERNAL */
1444 	ss_mnt = vfs_kern_mount(type, SB_KERNMOUNT, dev_name, raw_data);
1445 	module_put(type->owner);
1446 	if (IS_ERR(ss_mnt)) {
1447 		status = nfserr_nodev;
1448 		nfsd4_ssc_cancel_dul(nn, *nsui);
1449 		goto out_free_devname;
1450 	}
1451 	nfsd4_ssc_update_dul(nn, *nsui, ss_mnt);
1452 out_done:
1453 	status = 0;
1454 
1455 out_free_devname:
1456 	kfree(dev_name);
1457 out_free_rawdata:
1458 	kfree(raw_data);
1459 out_free_ipaddr:
1460 	kfree(ipaddr);
1461 out_err:
1462 	return status;
1463 }
1464 
1465 /*
1466  * Verify COPY destination stateid.
1467  *
1468  * Connect to the source server with NFSv4.1.
1469  * Create the source struct file for nfsd_copy_range.
1470  * Called with COPY cstate:
1471  *    SAVED_FH: source filehandle
1472  *    CURRENT_FH: destination filehandle
1473  */
1474 static __be32
1475 nfsd4_setup_inter_ssc(struct svc_rqst *rqstp,
1476 		      struct nfsd4_compound_state *cstate,
1477 		      struct nfsd4_copy *copy)
1478 {
1479 	struct svc_fh *s_fh = NULL;
1480 	stateid_t *s_stid = &copy->cp_src_stateid;
1481 	__be32 status = nfserr_inval;
1482 
1483 	/* Verify the destination stateid and set dst struct file*/
1484 	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1485 					    &copy->cp_dst_stateid,
1486 					    WR_STATE, &copy->nf_dst, NULL);
1487 	if (status)
1488 		goto out;
1489 
1490 	status = nfsd4_interssc_connect(copy->cp_src, rqstp, &copy->ss_nsui);
1491 	if (status)
1492 		goto out;
1493 
1494 	s_fh = &cstate->save_fh;
1495 
1496 	copy->c_fh.size = s_fh->fh_handle.fh_size;
1497 	memcpy(copy->c_fh.data, &s_fh->fh_handle.fh_raw, copy->c_fh.size);
1498 	copy->stateid.seqid = cpu_to_be32(s_stid->si_generation);
1499 	memcpy(copy->stateid.other, (void *)&s_stid->si_opaque,
1500 	       sizeof(stateid_opaque_t));
1501 
1502 	status = 0;
1503 out:
1504 	return status;
1505 }
1506 
1507 static void
1508 nfsd4_cleanup_inter_ssc(struct nfsd4_ssc_umount_item *nsui, struct file *filp,
1509 			struct nfsd_file *dst)
1510 {
1511 	struct nfsd_net *nn = net_generic(dst->nf_net, nfsd_net_id);
1512 	long timeout = msecs_to_jiffies(nfsd4_ssc_umount_timeout);
1513 
1514 	nfs42_ssc_close(filp);
1515 	fput(filp);
1516 
1517 	spin_lock(&nn->nfsd_ssc_lock);
1518 	list_del(&nsui->nsui_list);
1519 	/*
1520 	 * vfsmount can be shared by multiple exports,
1521 	 * decrement refcnt. If the count drops to 1 it
1522 	 * will be unmounted when nsui_expire expires.
1523 	 */
1524 	refcount_dec(&nsui->nsui_refcnt);
1525 	nsui->nsui_expire = jiffies + timeout;
1526 	list_add_tail(&nsui->nsui_list, &nn->nfsd_ssc_mount_list);
1527 	spin_unlock(&nn->nfsd_ssc_lock);
1528 }
1529 
1530 #else /* CONFIG_NFSD_V4_2_INTER_SSC */
1531 
1532 static __be32
1533 nfsd4_setup_inter_ssc(struct svc_rqst *rqstp,
1534 		      struct nfsd4_compound_state *cstate,
1535 		      struct nfsd4_copy *copy)
1536 {
1537 	return nfserr_inval;
1538 }
1539 
1540 static void
1541 nfsd4_cleanup_inter_ssc(struct nfsd4_ssc_umount_item *nsui, struct file *filp,
1542 			struct nfsd_file *dst)
1543 {
1544 }
1545 
1546 static struct file *nfs42_ssc_open(struct vfsmount *ss_mnt,
1547 				   struct nfs_fh *src_fh,
1548 				   nfs4_stateid *stateid)
1549 {
1550 	return NULL;
1551 }
1552 #endif /* CONFIG_NFSD_V4_2_INTER_SSC */
1553 
1554 static __be32
1555 nfsd4_setup_intra_ssc(struct svc_rqst *rqstp,
1556 		      struct nfsd4_compound_state *cstate,
1557 		      struct nfsd4_copy *copy)
1558 {
1559 	return nfsd4_verify_copy(rqstp, cstate, &copy->cp_src_stateid,
1560 				 &copy->nf_src, &copy->cp_dst_stateid,
1561 				 &copy->nf_dst);
1562 }
1563 
1564 static void nfsd4_cb_offload_release(struct nfsd4_callback *cb)
1565 {
1566 	struct nfsd4_cb_offload *cbo =
1567 		container_of(cb, struct nfsd4_cb_offload, co_cb);
1568 
1569 	kfree(cbo);
1570 }
1571 
1572 static int nfsd4_cb_offload_done(struct nfsd4_callback *cb,
1573 				 struct rpc_task *task)
1574 {
1575 	struct nfsd4_cb_offload *cbo =
1576 		container_of(cb, struct nfsd4_cb_offload, co_cb);
1577 
1578 	trace_nfsd_cb_offload_done(&cbo->co_res.cb_stateid, task);
1579 	return 1;
1580 }
1581 
1582 static const struct nfsd4_callback_ops nfsd4_cb_offload_ops = {
1583 	.release = nfsd4_cb_offload_release,
1584 	.done = nfsd4_cb_offload_done
1585 };
1586 
1587 static void nfsd4_init_copy_res(struct nfsd4_copy *copy, bool sync)
1588 {
1589 	copy->cp_res.wr_stable_how =
1590 		test_bit(NFSD4_COPY_F_COMMITTED, &copy->cp_flags) ?
1591 			NFS_FILE_SYNC : NFS_UNSTABLE;
1592 	nfsd4_copy_set_sync(copy, sync);
1593 	gen_boot_verifier(&copy->cp_res.wr_verifier, copy->cp_clp->net);
1594 }
1595 
1596 static ssize_t _nfsd_copy_file_range(struct nfsd4_copy *copy,
1597 				     struct file *dst,
1598 				     struct file *src)
1599 {
1600 	errseq_t since;
1601 	ssize_t bytes_copied = 0;
1602 	u64 bytes_total = copy->cp_count;
1603 	u64 src_pos = copy->cp_src_pos;
1604 	u64 dst_pos = copy->cp_dst_pos;
1605 	int status;
1606 	loff_t end;
1607 
1608 	/* See RFC 7862 p.67: */
1609 	if (bytes_total == 0)
1610 		bytes_total = ULLONG_MAX;
1611 	do {
1612 		if (kthread_should_stop())
1613 			break;
1614 		bytes_copied = nfsd_copy_file_range(src, src_pos, dst, dst_pos,
1615 						    bytes_total);
1616 		if (bytes_copied <= 0)
1617 			break;
1618 		bytes_total -= bytes_copied;
1619 		copy->cp_res.wr_bytes_written += bytes_copied;
1620 		src_pos += bytes_copied;
1621 		dst_pos += bytes_copied;
1622 	} while (bytes_total > 0 && nfsd4_copy_is_async(copy));
1623 	/* for a non-zero asynchronous copy do a commit of data */
1624 	if (nfsd4_copy_is_async(copy) && copy->cp_res.wr_bytes_written > 0) {
1625 		since = READ_ONCE(dst->f_wb_err);
1626 		end = copy->cp_dst_pos + copy->cp_res.wr_bytes_written - 1;
1627 		status = vfs_fsync_range(dst, copy->cp_dst_pos, end, 0);
1628 		if (!status)
1629 			status = filemap_check_wb_err(dst->f_mapping, since);
1630 		if (!status)
1631 			set_bit(NFSD4_COPY_F_COMMITTED, &copy->cp_flags);
1632 	}
1633 	return bytes_copied;
1634 }
1635 
1636 static __be32 nfsd4_do_copy(struct nfsd4_copy *copy,
1637 			    struct file *src, struct file *dst,
1638 			    bool sync)
1639 {
1640 	__be32 status;
1641 	ssize_t bytes;
1642 
1643 	bytes = _nfsd_copy_file_range(copy, dst, src);
1644 
1645 	/* for async copy, we ignore the error, client can always retry
1646 	 * to get the error
1647 	 */
1648 	if (bytes < 0 && !copy->cp_res.wr_bytes_written)
1649 		status = nfserrno(bytes);
1650 	else {
1651 		nfsd4_init_copy_res(copy, sync);
1652 		status = nfs_ok;
1653 	}
1654 	return status;
1655 }
1656 
1657 static void dup_copy_fields(struct nfsd4_copy *src, struct nfsd4_copy *dst)
1658 {
1659 	dst->cp_src_pos = src->cp_src_pos;
1660 	dst->cp_dst_pos = src->cp_dst_pos;
1661 	dst->cp_count = src->cp_count;
1662 	dst->cp_flags = src->cp_flags;
1663 	memcpy(&dst->cp_res, &src->cp_res, sizeof(src->cp_res));
1664 	memcpy(&dst->fh, &src->fh, sizeof(src->fh));
1665 	dst->cp_clp = src->cp_clp;
1666 	dst->nf_dst = nfsd_file_get(src->nf_dst);
1667 	/* for inter, nf_src doesn't exist yet */
1668 	if (!nfsd4_ssc_is_inter(src))
1669 		dst->nf_src = nfsd_file_get(src->nf_src);
1670 
1671 	memcpy(&dst->cp_stateid, &src->cp_stateid, sizeof(src->cp_stateid));
1672 	memcpy(dst->cp_src, src->cp_src, sizeof(struct nl4_server));
1673 	memcpy(&dst->stateid, &src->stateid, sizeof(src->stateid));
1674 	memcpy(&dst->c_fh, &src->c_fh, sizeof(src->c_fh));
1675 	dst->ss_nsui = src->ss_nsui;
1676 }
1677 
1678 static void release_copy_files(struct nfsd4_copy *copy)
1679 {
1680 	if (copy->nf_src)
1681 		nfsd_file_put(copy->nf_src);
1682 	if (copy->nf_dst)
1683 		nfsd_file_put(copy->nf_dst);
1684 }
1685 
1686 static void cleanup_async_copy(struct nfsd4_copy *copy)
1687 {
1688 	nfs4_free_copy_state(copy);
1689 	release_copy_files(copy);
1690 	if (copy->cp_clp) {
1691 		spin_lock(&copy->cp_clp->async_lock);
1692 		if (!list_empty(&copy->copies))
1693 			list_del_init(&copy->copies);
1694 		spin_unlock(&copy->cp_clp->async_lock);
1695 	}
1696 	nfs4_put_copy(copy);
1697 }
1698 
1699 static void nfsd4_send_cb_offload(struct nfsd4_copy *copy, __be32 nfserr)
1700 {
1701 	struct nfsd4_cb_offload *cbo;
1702 
1703 	cbo = kzalloc(sizeof(*cbo), GFP_KERNEL);
1704 	if (!cbo)
1705 		return;
1706 
1707 	memcpy(&cbo->co_res, &copy->cp_res, sizeof(copy->cp_res));
1708 	memcpy(&cbo->co_fh, &copy->fh, sizeof(copy->fh));
1709 	cbo->co_nfserr = nfserr;
1710 
1711 	nfsd4_init_cb(&cbo->co_cb, copy->cp_clp, &nfsd4_cb_offload_ops,
1712 		      NFSPROC4_CLNT_CB_OFFLOAD);
1713 	trace_nfsd_cb_offload(copy->cp_clp, &cbo->co_res.cb_stateid,
1714 			      &cbo->co_fh, copy->cp_count, nfserr);
1715 	nfsd4_run_cb(&cbo->co_cb);
1716 }
1717 
1718 /**
1719  * nfsd4_do_async_copy - kthread function for background server-side COPY
1720  * @data: arguments for COPY operation
1721  *
1722  * Return values:
1723  *   %0: Copy operation is done.
1724  */
1725 static int nfsd4_do_async_copy(void *data)
1726 {
1727 	struct nfsd4_copy *copy = (struct nfsd4_copy *)data;
1728 	__be32 nfserr;
1729 
1730 	if (nfsd4_ssc_is_inter(copy)) {
1731 		struct file *filp;
1732 
1733 		filp = nfs42_ssc_open(copy->ss_nsui->nsui_vfsmount,
1734 				      &copy->c_fh, &copy->stateid);
1735 		if (IS_ERR(filp)) {
1736 			switch (PTR_ERR(filp)) {
1737 			case -EBADF:
1738 				nfserr = nfserr_wrong_type;
1739 				break;
1740 			default:
1741 				nfserr = nfserr_offload_denied;
1742 			}
1743 			/* ss_mnt will be unmounted by the laundromat */
1744 			goto do_callback;
1745 		}
1746 		nfserr = nfsd4_do_copy(copy, filp, copy->nf_dst->nf_file,
1747 				       false);
1748 		nfsd4_cleanup_inter_ssc(copy->ss_nsui, filp, copy->nf_dst);
1749 	} else {
1750 		nfserr = nfsd4_do_copy(copy, copy->nf_src->nf_file,
1751 				       copy->nf_dst->nf_file, false);
1752 	}
1753 
1754 do_callback:
1755 	nfsd4_send_cb_offload(copy, nfserr);
1756 	cleanup_async_copy(copy);
1757 	return 0;
1758 }
1759 
1760 static __be32
1761 nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1762 		union nfsd4_op_u *u)
1763 {
1764 	struct nfsd4_copy *copy = &u->copy;
1765 	__be32 status;
1766 	struct nfsd4_copy *async_copy = NULL;
1767 
1768 	if (nfsd4_ssc_is_inter(copy)) {
1769 		if (!inter_copy_offload_enable || nfsd4_copy_is_sync(copy)) {
1770 			status = nfserr_notsupp;
1771 			goto out;
1772 		}
1773 		status = nfsd4_setup_inter_ssc(rqstp, cstate, copy);
1774 		if (status)
1775 			return nfserr_offload_denied;
1776 	} else {
1777 		status = nfsd4_setup_intra_ssc(rqstp, cstate, copy);
1778 		if (status)
1779 			return status;
1780 	}
1781 
1782 	copy->cp_clp = cstate->clp;
1783 	memcpy(&copy->fh, &cstate->current_fh.fh_handle,
1784 		sizeof(struct knfsd_fh));
1785 	if (nfsd4_copy_is_async(copy)) {
1786 		struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1787 
1788 		status = nfserrno(-ENOMEM);
1789 		async_copy = kzalloc(sizeof(struct nfsd4_copy), GFP_KERNEL);
1790 		if (!async_copy)
1791 			goto out_err;
1792 		INIT_LIST_HEAD(&async_copy->copies);
1793 		refcount_set(&async_copy->refcount, 1);
1794 		async_copy->cp_src = kmalloc(sizeof(*async_copy->cp_src), GFP_KERNEL);
1795 		if (!async_copy->cp_src)
1796 			goto out_err;
1797 		if (!nfs4_init_copy_state(nn, copy))
1798 			goto out_err;
1799 		memcpy(&copy->cp_res.cb_stateid, &copy->cp_stateid.cs_stid,
1800 			sizeof(copy->cp_res.cb_stateid));
1801 		dup_copy_fields(copy, async_copy);
1802 		async_copy->copy_task = kthread_create(nfsd4_do_async_copy,
1803 				async_copy, "%s", "copy thread");
1804 		if (IS_ERR(async_copy->copy_task))
1805 			goto out_err;
1806 		spin_lock(&async_copy->cp_clp->async_lock);
1807 		list_add(&async_copy->copies,
1808 				&async_copy->cp_clp->async_copies);
1809 		spin_unlock(&async_copy->cp_clp->async_lock);
1810 		wake_up_process(async_copy->copy_task);
1811 		status = nfs_ok;
1812 	} else {
1813 		status = nfsd4_do_copy(copy, copy->nf_src->nf_file,
1814 				       copy->nf_dst->nf_file, true);
1815 	}
1816 out:
1817 	release_copy_files(copy);
1818 	return status;
1819 out_err:
1820 	if (nfsd4_ssc_is_inter(copy)) {
1821 		/*
1822 		 * Source's vfsmount of inter-copy will be unmounted
1823 		 * by the laundromat. Use copy instead of async_copy
1824 		 * since async_copy->ss_nsui might not be set yet.
1825 		 */
1826 		refcount_dec(&copy->ss_nsui->nsui_refcnt);
1827 	}
1828 	if (async_copy)
1829 		cleanup_async_copy(async_copy);
1830 	status = nfserrno(-ENOMEM);
1831 	goto out;
1832 }
1833 
1834 static struct nfsd4_copy *
1835 find_async_copy_locked(struct nfs4_client *clp, stateid_t *stateid)
1836 {
1837 	struct nfsd4_copy *copy;
1838 
1839 	lockdep_assert_held(&clp->async_lock);
1840 
1841 	list_for_each_entry(copy, &clp->async_copies, copies) {
1842 		if (memcmp(&copy->cp_stateid.cs_stid, stateid, NFS4_STATEID_SIZE))
1843 			continue;
1844 		return copy;
1845 	}
1846 	return NULL;
1847 }
1848 
1849 static struct nfsd4_copy *
1850 find_async_copy(struct nfs4_client *clp, stateid_t *stateid)
1851 {
1852 	struct nfsd4_copy *copy;
1853 
1854 	spin_lock(&clp->async_lock);
1855 	copy = find_async_copy_locked(clp, stateid);
1856 	if (copy)
1857 		refcount_inc(&copy->refcount);
1858 	spin_unlock(&clp->async_lock);
1859 	return copy;
1860 }
1861 
1862 static __be32
1863 nfsd4_offload_cancel(struct svc_rqst *rqstp,
1864 		     struct nfsd4_compound_state *cstate,
1865 		     union nfsd4_op_u *u)
1866 {
1867 	struct nfsd4_offload_status *os = &u->offload_status;
1868 	struct nfsd4_copy *copy;
1869 	struct nfs4_client *clp = cstate->clp;
1870 
1871 	copy = find_async_copy(clp, &os->stateid);
1872 	if (!copy) {
1873 		struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1874 
1875 		return manage_cpntf_state(nn, &os->stateid, clp, NULL);
1876 	} else
1877 		nfsd4_stop_copy(copy);
1878 
1879 	return nfs_ok;
1880 }
1881 
1882 static __be32
1883 nfsd4_copy_notify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1884 		  union nfsd4_op_u *u)
1885 {
1886 	struct nfsd4_copy_notify *cn = &u->copy_notify;
1887 	__be32 status;
1888 	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1889 	struct nfs4_stid *stid;
1890 	struct nfs4_cpntf_state *cps;
1891 	struct nfs4_client *clp = cstate->clp;
1892 
1893 	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1894 					&cn->cpn_src_stateid, RD_STATE, NULL,
1895 					&stid);
1896 	if (status)
1897 		return status;
1898 
1899 	cn->cpn_sec = nn->nfsd4_lease;
1900 	cn->cpn_nsec = 0;
1901 
1902 	status = nfserrno(-ENOMEM);
1903 	cps = nfs4_alloc_init_cpntf_state(nn, stid);
1904 	if (!cps)
1905 		goto out;
1906 	memcpy(&cn->cpn_cnr_stateid, &cps->cp_stateid.cs_stid, sizeof(stateid_t));
1907 	memcpy(&cps->cp_p_stateid, &stid->sc_stateid, sizeof(stateid_t));
1908 	memcpy(&cps->cp_p_clid, &clp->cl_clientid, sizeof(clientid_t));
1909 
1910 	/* For now, only return one server address in cpn_src, the
1911 	 * address used by the client to connect to this server.
1912 	 */
1913 	cn->cpn_src->nl4_type = NL4_NETADDR;
1914 	status = nfsd4_set_netaddr((struct sockaddr *)&rqstp->rq_daddr,
1915 				 &cn->cpn_src->u.nl4_addr);
1916 	WARN_ON_ONCE(status);
1917 	if (status) {
1918 		nfs4_put_cpntf_state(nn, cps);
1919 		goto out;
1920 	}
1921 out:
1922 	nfs4_put_stid(stid);
1923 	return status;
1924 }
1925 
1926 static __be32
1927 nfsd4_fallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1928 		struct nfsd4_fallocate *fallocate, int flags)
1929 {
1930 	__be32 status;
1931 	struct nfsd_file *nf;
1932 
1933 	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1934 					    &fallocate->falloc_stateid,
1935 					    WR_STATE, &nf, NULL);
1936 	if (status != nfs_ok)
1937 		return status;
1938 
1939 	status = nfsd4_vfs_fallocate(rqstp, &cstate->current_fh, nf->nf_file,
1940 				     fallocate->falloc_offset,
1941 				     fallocate->falloc_length,
1942 				     flags);
1943 	nfsd_file_put(nf);
1944 	return status;
1945 }
1946 
1947 static __be32
1948 nfsd4_offload_status(struct svc_rqst *rqstp,
1949 		     struct nfsd4_compound_state *cstate,
1950 		     union nfsd4_op_u *u)
1951 {
1952 	struct nfsd4_offload_status *os = &u->offload_status;
1953 	__be32 status = nfs_ok;
1954 	struct nfsd4_copy *copy;
1955 	struct nfs4_client *clp = cstate->clp;
1956 
1957 	spin_lock(&clp->async_lock);
1958 	copy = find_async_copy_locked(clp, &os->stateid);
1959 	if (copy)
1960 		os->count = copy->cp_res.wr_bytes_written;
1961 	else
1962 		status = nfserr_bad_stateid;
1963 	spin_unlock(&clp->async_lock);
1964 
1965 	return status;
1966 }
1967 
1968 static __be32
1969 nfsd4_allocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1970 	       union nfsd4_op_u *u)
1971 {
1972 	return nfsd4_fallocate(rqstp, cstate, &u->allocate, 0);
1973 }
1974 
1975 static __be32
1976 nfsd4_deallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1977 		 union nfsd4_op_u *u)
1978 {
1979 	return nfsd4_fallocate(rqstp, cstate, &u->deallocate,
1980 			       FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE);
1981 }
1982 
1983 static __be32
1984 nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1985 	   union nfsd4_op_u *u)
1986 {
1987 	struct nfsd4_seek *seek = &u->seek;
1988 	int whence;
1989 	__be32 status;
1990 	struct nfsd_file *nf;
1991 
1992 	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1993 					    &seek->seek_stateid,
1994 					    RD_STATE, &nf, NULL);
1995 	if (status)
1996 		return status;
1997 
1998 	switch (seek->seek_whence) {
1999 	case NFS4_CONTENT_DATA:
2000 		whence = SEEK_DATA;
2001 		break;
2002 	case NFS4_CONTENT_HOLE:
2003 		whence = SEEK_HOLE;
2004 		break;
2005 	default:
2006 		status = nfserr_union_notsupp;
2007 		goto out;
2008 	}
2009 
2010 	/*
2011 	 * Note:  This call does change file->f_pos, but nothing in NFSD
2012 	 *        should ever file->f_pos.
2013 	 */
2014 	seek->seek_pos = vfs_llseek(nf->nf_file, seek->seek_offset, whence);
2015 	if (seek->seek_pos < 0)
2016 		status = nfserrno(seek->seek_pos);
2017 	else if (seek->seek_pos >= i_size_read(file_inode(nf->nf_file)))
2018 		seek->seek_eof = true;
2019 
2020 out:
2021 	nfsd_file_put(nf);
2022 	return status;
2023 }
2024 
2025 /* This routine never returns NFS_OK!  If there are no other errors, it
2026  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
2027  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
2028  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
2029  */
2030 static __be32
2031 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2032 	     struct nfsd4_verify *verify)
2033 {
2034 	__be32 *buf, *p;
2035 	int count;
2036 	__be32 status;
2037 
2038 	status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
2039 	if (status)
2040 		return status;
2041 
2042 	status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
2043 	if (status)
2044 		return status;
2045 
2046 	if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
2047 	    || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
2048 		return nfserr_inval;
2049 	if (verify->ve_attrlen & 3)
2050 		return nfserr_inval;
2051 
2052 	/* count in words:
2053 	 *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
2054 	 */
2055 	count = 4 + (verify->ve_attrlen >> 2);
2056 	buf = kmalloc(count << 2, GFP_KERNEL);
2057 	if (!buf)
2058 		return nfserr_jukebox;
2059 
2060 	p = buf;
2061 	status = nfsd4_encode_fattr_to_buf(&p, count, &cstate->current_fh,
2062 				    cstate->current_fh.fh_export,
2063 				    cstate->current_fh.fh_dentry,
2064 				    verify->ve_bmval,
2065 				    rqstp, 0);
2066 	/*
2067 	 * If nfsd4_encode_fattr() ran out of space, assume that's because
2068 	 * the attributes are longer (hence different) than those given:
2069 	 */
2070 	if (status == nfserr_resource)
2071 		status = nfserr_not_same;
2072 	if (status)
2073 		goto out_kfree;
2074 
2075 	/* skip bitmap */
2076 	p = buf + 1 + ntohl(buf[0]);
2077 	status = nfserr_not_same;
2078 	if (ntohl(*p++) != verify->ve_attrlen)
2079 		goto out_kfree;
2080 	if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
2081 		status = nfserr_same;
2082 
2083 out_kfree:
2084 	kfree(buf);
2085 	return status;
2086 }
2087 
2088 static __be32
2089 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2090 	      union nfsd4_op_u *u)
2091 {
2092 	__be32 status;
2093 
2094 	status = _nfsd4_verify(rqstp, cstate, &u->verify);
2095 	return status == nfserr_not_same ? nfs_ok : status;
2096 }
2097 
2098 static __be32
2099 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2100 	     union nfsd4_op_u *u)
2101 {
2102 	__be32 status;
2103 
2104 	status = _nfsd4_verify(rqstp, cstate, &u->nverify);
2105 	return status == nfserr_same ? nfs_ok : status;
2106 }
2107 
2108 #ifdef CONFIG_NFSD_PNFS
2109 static const struct nfsd4_layout_ops *
2110 nfsd4_layout_verify(struct svc_export *exp, unsigned int layout_type)
2111 {
2112 	if (!exp->ex_layout_types) {
2113 		dprintk("%s: export does not support pNFS\n", __func__);
2114 		return NULL;
2115 	}
2116 
2117 	if (layout_type >= LAYOUT_TYPE_MAX ||
2118 	    !(exp->ex_layout_types & (1 << layout_type))) {
2119 		dprintk("%s: layout type %d not supported\n",
2120 			__func__, layout_type);
2121 		return NULL;
2122 	}
2123 
2124 	return nfsd4_layout_ops[layout_type];
2125 }
2126 
2127 static __be32
2128 nfsd4_getdeviceinfo(struct svc_rqst *rqstp,
2129 		struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
2130 {
2131 	struct nfsd4_getdeviceinfo *gdp = &u->getdeviceinfo;
2132 	const struct nfsd4_layout_ops *ops;
2133 	struct nfsd4_deviceid_map *map;
2134 	struct svc_export *exp;
2135 	__be32 nfserr;
2136 
2137 	dprintk("%s: layout_type %u dev_id [0x%llx:0x%x] maxcnt %u\n",
2138 	       __func__,
2139 	       gdp->gd_layout_type,
2140 	       gdp->gd_devid.fsid_idx, gdp->gd_devid.generation,
2141 	       gdp->gd_maxcount);
2142 
2143 	map = nfsd4_find_devid_map(gdp->gd_devid.fsid_idx);
2144 	if (!map) {
2145 		dprintk("%s: couldn't find device ID to export mapping!\n",
2146 			__func__);
2147 		return nfserr_noent;
2148 	}
2149 
2150 	exp = rqst_exp_find(rqstp, map->fsid_type, map->fsid);
2151 	if (IS_ERR(exp)) {
2152 		dprintk("%s: could not find device id\n", __func__);
2153 		return nfserr_noent;
2154 	}
2155 
2156 	nfserr = nfserr_layoutunavailable;
2157 	ops = nfsd4_layout_verify(exp, gdp->gd_layout_type);
2158 	if (!ops)
2159 		goto out;
2160 
2161 	nfserr = nfs_ok;
2162 	if (gdp->gd_maxcount != 0) {
2163 		nfserr = ops->proc_getdeviceinfo(exp->ex_path.mnt->mnt_sb,
2164 				rqstp, cstate->clp, gdp);
2165 	}
2166 
2167 	gdp->gd_notify_types &= ops->notify_types;
2168 out:
2169 	exp_put(exp);
2170 	return nfserr;
2171 }
2172 
2173 static void
2174 nfsd4_getdeviceinfo_release(union nfsd4_op_u *u)
2175 {
2176 	kfree(u->getdeviceinfo.gd_device);
2177 }
2178 
2179 static __be32
2180 nfsd4_layoutget(struct svc_rqst *rqstp,
2181 		struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
2182 {
2183 	struct nfsd4_layoutget *lgp = &u->layoutget;
2184 	struct svc_fh *current_fh = &cstate->current_fh;
2185 	const struct nfsd4_layout_ops *ops;
2186 	struct nfs4_layout_stateid *ls;
2187 	__be32 nfserr;
2188 	int accmode = NFSD_MAY_READ_IF_EXEC;
2189 
2190 	switch (lgp->lg_seg.iomode) {
2191 	case IOMODE_READ:
2192 		accmode |= NFSD_MAY_READ;
2193 		break;
2194 	case IOMODE_RW:
2195 		accmode |= NFSD_MAY_READ | NFSD_MAY_WRITE;
2196 		break;
2197 	default:
2198 		dprintk("%s: invalid iomode %d\n",
2199 			__func__, lgp->lg_seg.iomode);
2200 		nfserr = nfserr_badiomode;
2201 		goto out;
2202 	}
2203 
2204 	nfserr = fh_verify(rqstp, current_fh, 0, accmode);
2205 	if (nfserr)
2206 		goto out;
2207 
2208 	nfserr = nfserr_layoutunavailable;
2209 	ops = nfsd4_layout_verify(current_fh->fh_export, lgp->lg_layout_type);
2210 	if (!ops)
2211 		goto out;
2212 
2213 	/*
2214 	 * Verify minlength and range as per RFC5661:
2215 	 *  o  If loga_length is less than loga_minlength,
2216 	 *     the metadata server MUST return NFS4ERR_INVAL.
2217 	 *  o  If the sum of loga_offset and loga_minlength exceeds
2218 	 *     NFS4_UINT64_MAX, and loga_minlength is not
2219 	 *     NFS4_UINT64_MAX, the error NFS4ERR_INVAL MUST result.
2220 	 *  o  If the sum of loga_offset and loga_length exceeds
2221 	 *     NFS4_UINT64_MAX, and loga_length is not NFS4_UINT64_MAX,
2222 	 *     the error NFS4ERR_INVAL MUST result.
2223 	 */
2224 	nfserr = nfserr_inval;
2225 	if (lgp->lg_seg.length < lgp->lg_minlength ||
2226 	    (lgp->lg_minlength != NFS4_MAX_UINT64 &&
2227 	     lgp->lg_minlength > NFS4_MAX_UINT64 - lgp->lg_seg.offset) ||
2228 	    (lgp->lg_seg.length != NFS4_MAX_UINT64 &&
2229 	     lgp->lg_seg.length > NFS4_MAX_UINT64 - lgp->lg_seg.offset))
2230 		goto out;
2231 	if (lgp->lg_seg.length == 0)
2232 		goto out;
2233 
2234 	nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lgp->lg_sid,
2235 						true, lgp->lg_layout_type, &ls);
2236 	if (nfserr) {
2237 		trace_nfsd_layout_get_lookup_fail(&lgp->lg_sid);
2238 		goto out;
2239 	}
2240 
2241 	nfserr = nfserr_recallconflict;
2242 	if (atomic_read(&ls->ls_stid.sc_file->fi_lo_recalls))
2243 		goto out_put_stid;
2244 
2245 	nfserr = ops->proc_layoutget(d_inode(current_fh->fh_dentry),
2246 				     current_fh, lgp);
2247 	if (nfserr)
2248 		goto out_put_stid;
2249 
2250 	nfserr = nfsd4_insert_layout(lgp, ls);
2251 
2252 out_put_stid:
2253 	mutex_unlock(&ls->ls_mutex);
2254 	nfs4_put_stid(&ls->ls_stid);
2255 out:
2256 	return nfserr;
2257 }
2258 
2259 static void
2260 nfsd4_layoutget_release(union nfsd4_op_u *u)
2261 {
2262 	kfree(u->layoutget.lg_content);
2263 }
2264 
2265 static __be32
2266 nfsd4_layoutcommit(struct svc_rqst *rqstp,
2267 		struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
2268 {
2269 	struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
2270 	const struct nfsd4_layout_seg *seg = &lcp->lc_seg;
2271 	struct svc_fh *current_fh = &cstate->current_fh;
2272 	const struct nfsd4_layout_ops *ops;
2273 	loff_t new_size = lcp->lc_last_wr + 1;
2274 	struct inode *inode;
2275 	struct nfs4_layout_stateid *ls;
2276 	__be32 nfserr;
2277 
2278 	nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_WRITE);
2279 	if (nfserr)
2280 		goto out;
2281 
2282 	nfserr = nfserr_layoutunavailable;
2283 	ops = nfsd4_layout_verify(current_fh->fh_export, lcp->lc_layout_type);
2284 	if (!ops)
2285 		goto out;
2286 	inode = d_inode(current_fh->fh_dentry);
2287 
2288 	nfserr = nfserr_inval;
2289 	if (new_size <= seg->offset) {
2290 		dprintk("pnfsd: last write before layout segment\n");
2291 		goto out;
2292 	}
2293 	if (new_size > seg->offset + seg->length) {
2294 		dprintk("pnfsd: last write beyond layout segment\n");
2295 		goto out;
2296 	}
2297 	if (!lcp->lc_newoffset && new_size > i_size_read(inode)) {
2298 		dprintk("pnfsd: layoutcommit beyond EOF\n");
2299 		goto out;
2300 	}
2301 
2302 	nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lcp->lc_sid,
2303 						false, lcp->lc_layout_type,
2304 						&ls);
2305 	if (nfserr) {
2306 		trace_nfsd_layout_commit_lookup_fail(&lcp->lc_sid);
2307 		/* fixup error code as per RFC5661 */
2308 		if (nfserr == nfserr_bad_stateid)
2309 			nfserr = nfserr_badlayout;
2310 		goto out;
2311 	}
2312 
2313 	/* LAYOUTCOMMIT does not require any serialization */
2314 	mutex_unlock(&ls->ls_mutex);
2315 
2316 	if (new_size > i_size_read(inode)) {
2317 		lcp->lc_size_chg = 1;
2318 		lcp->lc_newsize = new_size;
2319 	} else {
2320 		lcp->lc_size_chg = 0;
2321 	}
2322 
2323 	nfserr = ops->proc_layoutcommit(inode, lcp);
2324 	nfs4_put_stid(&ls->ls_stid);
2325 out:
2326 	return nfserr;
2327 }
2328 
2329 static __be32
2330 nfsd4_layoutreturn(struct svc_rqst *rqstp,
2331 		struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
2332 {
2333 	struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
2334 	struct svc_fh *current_fh = &cstate->current_fh;
2335 	__be32 nfserr;
2336 
2337 	nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_NOP);
2338 	if (nfserr)
2339 		goto out;
2340 
2341 	nfserr = nfserr_layoutunavailable;
2342 	if (!nfsd4_layout_verify(current_fh->fh_export, lrp->lr_layout_type))
2343 		goto out;
2344 
2345 	switch (lrp->lr_seg.iomode) {
2346 	case IOMODE_READ:
2347 	case IOMODE_RW:
2348 	case IOMODE_ANY:
2349 		break;
2350 	default:
2351 		dprintk("%s: invalid iomode %d\n", __func__,
2352 			lrp->lr_seg.iomode);
2353 		nfserr = nfserr_inval;
2354 		goto out;
2355 	}
2356 
2357 	switch (lrp->lr_return_type) {
2358 	case RETURN_FILE:
2359 		nfserr = nfsd4_return_file_layouts(rqstp, cstate, lrp);
2360 		break;
2361 	case RETURN_FSID:
2362 	case RETURN_ALL:
2363 		nfserr = nfsd4_return_client_layouts(rqstp, cstate, lrp);
2364 		break;
2365 	default:
2366 		dprintk("%s: invalid return_type %d\n", __func__,
2367 			lrp->lr_return_type);
2368 		nfserr = nfserr_inval;
2369 		break;
2370 	}
2371 out:
2372 	return nfserr;
2373 }
2374 #endif /* CONFIG_NFSD_PNFS */
2375 
2376 static __be32
2377 nfsd4_getxattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2378 	       union nfsd4_op_u *u)
2379 {
2380 	struct nfsd4_getxattr *getxattr = &u->getxattr;
2381 
2382 	return nfsd_getxattr(rqstp, &cstate->current_fh,
2383 			     getxattr->getxa_name, &getxattr->getxa_buf,
2384 			     &getxattr->getxa_len);
2385 }
2386 
2387 static __be32
2388 nfsd4_setxattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2389 	   union nfsd4_op_u *u)
2390 {
2391 	struct nfsd4_setxattr *setxattr = &u->setxattr;
2392 	__be32 ret;
2393 
2394 	if (opens_in_grace(SVC_NET(rqstp)))
2395 		return nfserr_grace;
2396 
2397 	ret = nfsd_setxattr(rqstp, &cstate->current_fh, setxattr->setxa_name,
2398 			    setxattr->setxa_buf, setxattr->setxa_len,
2399 			    setxattr->setxa_flags);
2400 
2401 	if (!ret)
2402 		set_change_info(&setxattr->setxa_cinfo, &cstate->current_fh);
2403 
2404 	return ret;
2405 }
2406 
2407 static __be32
2408 nfsd4_listxattrs(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2409 	   union nfsd4_op_u *u)
2410 {
2411 	/*
2412 	 * Get the entire list, then copy out only the user attributes
2413 	 * in the encode function.
2414 	 */
2415 	return nfsd_listxattr(rqstp, &cstate->current_fh,
2416 			     &u->listxattrs.lsxa_buf, &u->listxattrs.lsxa_len);
2417 }
2418 
2419 static __be32
2420 nfsd4_removexattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2421 	   union nfsd4_op_u *u)
2422 {
2423 	struct nfsd4_removexattr *removexattr = &u->removexattr;
2424 	__be32 ret;
2425 
2426 	if (opens_in_grace(SVC_NET(rqstp)))
2427 		return nfserr_grace;
2428 
2429 	ret = nfsd_removexattr(rqstp, &cstate->current_fh,
2430 	    removexattr->rmxa_name);
2431 
2432 	if (!ret)
2433 		set_change_info(&removexattr->rmxa_cinfo, &cstate->current_fh);
2434 
2435 	return ret;
2436 }
2437 
2438 /*
2439  * NULL call.
2440  */
2441 static __be32
2442 nfsd4_proc_null(struct svc_rqst *rqstp)
2443 {
2444 	return rpc_success;
2445 }
2446 
2447 static inline void nfsd4_increment_op_stats(u32 opnum)
2448 {
2449 	if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
2450 		percpu_counter_inc(&nfsdstats.counter[NFSD_STATS_NFS4_OP(opnum)]);
2451 }
2452 
2453 static const struct nfsd4_operation nfsd4_ops[];
2454 
2455 static const char *nfsd4_op_name(unsigned opnum);
2456 
2457 /*
2458  * Enforce NFSv4.1 COMPOUND ordering rules:
2459  *
2460  * Also note, enforced elsewhere:
2461  *	- SEQUENCE other than as first op results in
2462  *	  NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
2463  *	- BIND_CONN_TO_SESSION must be the only op in its compound.
2464  *	  (Enforced in nfsd4_bind_conn_to_session().)
2465  *	- DESTROY_SESSION must be the final operation in a compound, if
2466  *	  sessionid's in SEQUENCE and DESTROY_SESSION are the same.
2467  *	  (Enforced in nfsd4_destroy_session().)
2468  */
2469 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
2470 {
2471 	struct nfsd4_op *first_op = &args->ops[0];
2472 
2473 	/* These ordering requirements don't apply to NFSv4.0: */
2474 	if (args->minorversion == 0)
2475 		return nfs_ok;
2476 	/* This is weird, but OK, not our problem: */
2477 	if (args->opcnt == 0)
2478 		return nfs_ok;
2479 	if (first_op->status == nfserr_op_illegal)
2480 		return nfs_ok;
2481 	if (!(nfsd4_ops[first_op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
2482 		return nfserr_op_not_in_session;
2483 	if (first_op->opnum == OP_SEQUENCE)
2484 		return nfs_ok;
2485 	/*
2486 	 * So first_op is something allowed outside a session, like
2487 	 * EXCHANGE_ID; but then it has to be the only op in the
2488 	 * compound:
2489 	 */
2490 	if (args->opcnt != 1)
2491 		return nfserr_not_only_op;
2492 	return nfs_ok;
2493 }
2494 
2495 const struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
2496 {
2497 	return &nfsd4_ops[op->opnum];
2498 }
2499 
2500 bool nfsd4_cache_this_op(struct nfsd4_op *op)
2501 {
2502 	if (op->opnum == OP_ILLEGAL)
2503 		return false;
2504 	return OPDESC(op)->op_flags & OP_CACHEME;
2505 }
2506 
2507 static bool need_wrongsec_check(struct svc_rqst *rqstp)
2508 {
2509 	struct nfsd4_compoundres *resp = rqstp->rq_resp;
2510 	struct nfsd4_compoundargs *argp = rqstp->rq_argp;
2511 	struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
2512 	struct nfsd4_op *next = &argp->ops[resp->opcnt];
2513 	const struct nfsd4_operation *thisd = OPDESC(this);
2514 	const struct nfsd4_operation *nextd;
2515 
2516 	/*
2517 	 * Most ops check wronsec on our own; only the putfh-like ops
2518 	 * have special rules.
2519 	 */
2520 	if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
2521 		return false;
2522 	/*
2523 	 * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
2524 	 * put-filehandle operation if we're not going to use the
2525 	 * result:
2526 	 */
2527 	if (argp->opcnt == resp->opcnt)
2528 		return false;
2529 	if (next->opnum == OP_ILLEGAL)
2530 		return false;
2531 	nextd = OPDESC(next);
2532 	/*
2533 	 * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
2534 	 * errors themselves as necessary; others should check for them
2535 	 * now:
2536 	 */
2537 	return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
2538 }
2539 
2540 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
2541 static void
2542 check_if_stalefh_allowed(struct nfsd4_compoundargs *args)
2543 {
2544 	struct nfsd4_op	*op, *current_op = NULL, *saved_op = NULL;
2545 	struct nfsd4_copy *copy;
2546 	struct nfsd4_putfh *putfh;
2547 	int i;
2548 
2549 	/* traverse all operation and if it's a COPY compound, mark the
2550 	 * source filehandle to skip verification
2551 	 */
2552 	for (i = 0; i < args->opcnt; i++) {
2553 		op = &args->ops[i];
2554 		if (op->opnum == OP_PUTFH)
2555 			current_op = op;
2556 		else if (op->opnum == OP_SAVEFH)
2557 			saved_op = current_op;
2558 		else if (op->opnum == OP_RESTOREFH)
2559 			current_op = saved_op;
2560 		else if (op->opnum == OP_COPY) {
2561 			copy = (struct nfsd4_copy *)&op->u;
2562 			if (!saved_op) {
2563 				op->status = nfserr_nofilehandle;
2564 				return;
2565 			}
2566 			putfh = (struct nfsd4_putfh *)&saved_op->u;
2567 			if (nfsd4_ssc_is_inter(copy))
2568 				putfh->no_verify = true;
2569 		}
2570 	}
2571 }
2572 #else
2573 static void
2574 check_if_stalefh_allowed(struct nfsd4_compoundargs *args)
2575 {
2576 }
2577 #endif
2578 
2579 /*
2580  * COMPOUND call.
2581  */
2582 static __be32
2583 nfsd4_proc_compound(struct svc_rqst *rqstp)
2584 {
2585 	struct nfsd4_compoundargs *args = rqstp->rq_argp;
2586 	struct nfsd4_compoundres *resp = rqstp->rq_resp;
2587 	struct nfsd4_op	*op;
2588 	struct nfsd4_compound_state *cstate = &resp->cstate;
2589 	struct svc_fh *current_fh = &cstate->current_fh;
2590 	struct svc_fh *save_fh = &cstate->save_fh;
2591 	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2592 	__be32		status;
2593 
2594 	resp->xdr = &rqstp->rq_res_stream;
2595 	resp->statusp = resp->xdr->p;
2596 
2597 	/* reserve space for: NFS status code */
2598 	xdr_reserve_space(resp->xdr, XDR_UNIT);
2599 
2600 	/* reserve space for: taglen, tag, and opcnt */
2601 	xdr_reserve_space(resp->xdr, XDR_UNIT * 2 + args->taglen);
2602 	resp->taglen = args->taglen;
2603 	resp->tag = args->tag;
2604 	resp->rqstp = rqstp;
2605 	cstate->minorversion = args->minorversion;
2606 	fh_init(current_fh, NFS4_FHSIZE);
2607 	fh_init(save_fh, NFS4_FHSIZE);
2608 	/*
2609 	 * Don't use the deferral mechanism for NFSv4; compounds make it
2610 	 * too hard to avoid non-idempotency problems.
2611 	 */
2612 	clear_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
2613 
2614 	/*
2615 	 * According to RFC3010, this takes precedence over all other errors.
2616 	 */
2617 	status = nfserr_minor_vers_mismatch;
2618 	if (nfsd_minorversion(nn, args->minorversion, NFSD_TEST) <= 0)
2619 		goto out;
2620 
2621 	status = nfs41_check_op_ordering(args);
2622 	if (status) {
2623 		op = &args->ops[0];
2624 		op->status = status;
2625 		resp->opcnt = 1;
2626 		goto encode_op;
2627 	}
2628 	check_if_stalefh_allowed(args);
2629 
2630 	rqstp->rq_lease_breaker = (void **)&cstate->clp;
2631 
2632 	trace_nfsd_compound(rqstp, args->tag, args->taglen, args->client_opcnt);
2633 	while (!status && resp->opcnt < args->opcnt) {
2634 		op = &args->ops[resp->opcnt++];
2635 
2636 		if (unlikely(resp->opcnt == NFSD_MAX_OPS_PER_COMPOUND)) {
2637 			/* If there are still more operations to process,
2638 			 * stop here and report NFS4ERR_RESOURCE. */
2639 			if (cstate->minorversion == 0 &&
2640 			    args->client_opcnt > resp->opcnt) {
2641 				op->status = nfserr_resource;
2642 				goto encode_op;
2643 			}
2644 		}
2645 
2646 		/*
2647 		 * The XDR decode routines may have pre-set op->status;
2648 		 * for example, if there is a miscellaneous XDR error
2649 		 * it will be set to nfserr_bad_xdr.
2650 		 */
2651 		if (op->status) {
2652 			if (op->opnum == OP_OPEN)
2653 				op->status = nfsd4_open_omfg(rqstp, cstate, op);
2654 			goto encode_op;
2655 		}
2656 		if (!current_fh->fh_dentry &&
2657 				!HAS_FH_FLAG(current_fh, NFSD4_FH_FOREIGN)) {
2658 			if (!(op->opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
2659 				op->status = nfserr_nofilehandle;
2660 				goto encode_op;
2661 			}
2662 		} else if (current_fh->fh_export &&
2663 			   current_fh->fh_export->ex_fslocs.migrated &&
2664 			  !(op->opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
2665 			op->status = nfserr_moved;
2666 			goto encode_op;
2667 		}
2668 
2669 		fh_clear_pre_post_attrs(current_fh);
2670 
2671 		/* If op is non-idempotent */
2672 		if (op->opdesc->op_flags & OP_MODIFIES_SOMETHING) {
2673 			/*
2674 			 * Don't execute this op if we couldn't encode a
2675 			 * successful reply:
2676 			 */
2677 			u32 plen = op->opdesc->op_rsize_bop(rqstp, op);
2678 			/*
2679 			 * Plus if there's another operation, make sure
2680 			 * we'll have space to at least encode an error:
2681 			 */
2682 			if (resp->opcnt < args->opcnt)
2683 				plen += COMPOUND_ERR_SLACK_SPACE;
2684 			op->status = nfsd4_check_resp_size(resp, plen);
2685 		}
2686 
2687 		if (op->status)
2688 			goto encode_op;
2689 
2690 		if (op->opdesc->op_get_currentstateid)
2691 			op->opdesc->op_get_currentstateid(cstate, &op->u);
2692 		op->status = op->opdesc->op_func(rqstp, cstate, &op->u);
2693 
2694 		/* Only from SEQUENCE */
2695 		if (cstate->status == nfserr_replay_cache) {
2696 			dprintk("%s NFS4.1 replay from cache\n", __func__);
2697 			status = op->status;
2698 			goto out;
2699 		}
2700 		if (!op->status) {
2701 			if (op->opdesc->op_set_currentstateid)
2702 				op->opdesc->op_set_currentstateid(cstate, &op->u);
2703 
2704 			if (op->opdesc->op_flags & OP_CLEAR_STATEID)
2705 				clear_current_stateid(cstate);
2706 
2707 			if (current_fh->fh_export &&
2708 					need_wrongsec_check(rqstp))
2709 				op->status = check_nfsd_access(current_fh->fh_export, rqstp);
2710 		}
2711 encode_op:
2712 		if (op->status == nfserr_replay_me) {
2713 			op->replay = &cstate->replay_owner->so_replay;
2714 			nfsd4_encode_replay(resp->xdr, op);
2715 			status = op->status = op->replay->rp_status;
2716 		} else {
2717 			nfsd4_encode_operation(resp, op);
2718 			status = op->status;
2719 		}
2720 
2721 		trace_nfsd_compound_status(args->client_opcnt, resp->opcnt,
2722 					   status, nfsd4_op_name(op->opnum));
2723 
2724 		nfsd4_cstate_clear_replay(cstate);
2725 		nfsd4_increment_op_stats(op->opnum);
2726 	}
2727 
2728 	fh_put(current_fh);
2729 	fh_put(save_fh);
2730 	BUG_ON(cstate->replay_owner);
2731 out:
2732 	cstate->status = status;
2733 	/* Reset deferral mechanism for RPC deferrals */
2734 	set_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
2735 	return rpc_success;
2736 }
2737 
2738 #define op_encode_hdr_size		(2)
2739 #define op_encode_stateid_maxsz		(XDR_QUADLEN(NFS4_STATEID_SIZE))
2740 #define op_encode_verifier_maxsz	(XDR_QUADLEN(NFS4_VERIFIER_SIZE))
2741 #define op_encode_change_info_maxsz	(5)
2742 #define nfs4_fattr_bitmap_maxsz		(4)
2743 
2744 /* We'll fall back on returning no lockowner if run out of space: */
2745 #define op_encode_lockowner_maxsz	(0)
2746 #define op_encode_lock_denied_maxsz	(8 + op_encode_lockowner_maxsz)
2747 
2748 #define nfs4_owner_maxsz		(1 + XDR_QUADLEN(IDMAP_NAMESZ))
2749 
2750 #define op_encode_ace_maxsz		(3 + nfs4_owner_maxsz)
2751 #define op_encode_delegation_maxsz	(1 + op_encode_stateid_maxsz + 1 + \
2752 					 op_encode_ace_maxsz)
2753 
2754 #define op_encode_channel_attrs_maxsz	(6 + 1 + 1)
2755 
2756 /*
2757  * The _rsize() helpers are invoked by the NFSv4 COMPOUND decoder, which
2758  * is called before sunrpc sets rq_res.buflen. Thus we have to compute
2759  * the maximum payload size here, based on transport limits and the size
2760  * of the remaining space in the rq_pages array.
2761  */
2762 static u32 nfsd4_max_payload(const struct svc_rqst *rqstp)
2763 {
2764 	u32 buflen;
2765 
2766 	buflen = (rqstp->rq_page_end - rqstp->rq_next_page) * PAGE_SIZE;
2767 	buflen -= rqstp->rq_auth_slack;
2768 	buflen -= rqstp->rq_res.head[0].iov_len;
2769 	return min_t(u32, buflen, svc_max_payload(rqstp));
2770 }
2771 
2772 static u32 nfsd4_only_status_rsize(const struct svc_rqst *rqstp,
2773 				   const struct nfsd4_op *op)
2774 {
2775 	return (op_encode_hdr_size) * sizeof(__be32);
2776 }
2777 
2778 static u32 nfsd4_status_stateid_rsize(const struct svc_rqst *rqstp,
2779 				      const struct nfsd4_op *op)
2780 {
2781 	return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
2782 }
2783 
2784 static u32 nfsd4_access_rsize(const struct svc_rqst *rqstp,
2785 			      const struct nfsd4_op *op)
2786 {
2787 	/* ac_supported, ac_resp_access */
2788 	return (op_encode_hdr_size + 2)* sizeof(__be32);
2789 }
2790 
2791 static u32 nfsd4_commit_rsize(const struct svc_rqst *rqstp,
2792 			      const struct nfsd4_op *op)
2793 {
2794 	return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
2795 }
2796 
2797 static u32 nfsd4_create_rsize(const struct svc_rqst *rqstp,
2798 			      const struct nfsd4_op *op)
2799 {
2800 	return (op_encode_hdr_size + op_encode_change_info_maxsz
2801 		+ nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
2802 }
2803 
2804 /*
2805  * Note since this is an idempotent operation we won't insist on failing
2806  * the op prematurely if the estimate is too large.  We may turn off splice
2807  * reads unnecessarily.
2808  */
2809 static u32 nfsd4_getattr_rsize(const struct svc_rqst *rqstp,
2810 			       const struct nfsd4_op *op)
2811 {
2812 	const u32 *bmap = op->u.getattr.ga_bmval;
2813 	u32 bmap0 = bmap[0], bmap1 = bmap[1], bmap2 = bmap[2];
2814 	u32 ret = 0;
2815 
2816 	if (bmap0 & FATTR4_WORD0_ACL)
2817 		return nfsd4_max_payload(rqstp);
2818 	if (bmap0 & FATTR4_WORD0_FS_LOCATIONS)
2819 		return nfsd4_max_payload(rqstp);
2820 
2821 	if (bmap1 & FATTR4_WORD1_OWNER) {
2822 		ret += IDMAP_NAMESZ + 4;
2823 		bmap1 &= ~FATTR4_WORD1_OWNER;
2824 	}
2825 	if (bmap1 & FATTR4_WORD1_OWNER_GROUP) {
2826 		ret += IDMAP_NAMESZ + 4;
2827 		bmap1 &= ~FATTR4_WORD1_OWNER_GROUP;
2828 	}
2829 	if (bmap0 & FATTR4_WORD0_FILEHANDLE) {
2830 		ret += NFS4_FHSIZE + 4;
2831 		bmap0 &= ~FATTR4_WORD0_FILEHANDLE;
2832 	}
2833 	if (bmap2 & FATTR4_WORD2_SECURITY_LABEL) {
2834 		ret += NFS4_MAXLABELLEN + 12;
2835 		bmap2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2836 	}
2837 	/*
2838 	 * Largest of remaining attributes are 16 bytes (e.g.,
2839 	 * supported_attributes)
2840 	 */
2841 	ret += 16 * (hweight32(bmap0) + hweight32(bmap1) + hweight32(bmap2));
2842 	/* bitmask, length */
2843 	ret += 20;
2844 	return ret;
2845 }
2846 
2847 static u32 nfsd4_getfh_rsize(const struct svc_rqst *rqstp,
2848 			     const struct nfsd4_op *op)
2849 {
2850 	return (op_encode_hdr_size + 1) * sizeof(__be32) + NFS4_FHSIZE;
2851 }
2852 
2853 static u32 nfsd4_link_rsize(const struct svc_rqst *rqstp,
2854 			    const struct nfsd4_op *op)
2855 {
2856 	return (op_encode_hdr_size + op_encode_change_info_maxsz)
2857 		* sizeof(__be32);
2858 }
2859 
2860 static u32 nfsd4_lock_rsize(const struct svc_rqst *rqstp,
2861 			    const struct nfsd4_op *op)
2862 {
2863 	return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
2864 		* sizeof(__be32);
2865 }
2866 
2867 static u32 nfsd4_open_rsize(const struct svc_rqst *rqstp,
2868 			    const struct nfsd4_op *op)
2869 {
2870 	return (op_encode_hdr_size + op_encode_stateid_maxsz
2871 		+ op_encode_change_info_maxsz + 1
2872 		+ nfs4_fattr_bitmap_maxsz
2873 		+ op_encode_delegation_maxsz) * sizeof(__be32);
2874 }
2875 
2876 static u32 nfsd4_read_rsize(const struct svc_rqst *rqstp,
2877 			    const struct nfsd4_op *op)
2878 {
2879 	u32 rlen = min(op->u.read.rd_length, nfsd4_max_payload(rqstp));
2880 
2881 	return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
2882 }
2883 
2884 static u32 nfsd4_read_plus_rsize(const struct svc_rqst *rqstp,
2885 				 const struct nfsd4_op *op)
2886 {
2887 	u32 rlen = min(op->u.read.rd_length, nfsd4_max_payload(rqstp));
2888 	/*
2889 	 * If we detect that the file changed during hole encoding, then we
2890 	 * recover by encoding the remaining reply as data. This means we need
2891 	 * to set aside enough room to encode two data segments.
2892 	 */
2893 	u32 seg_len = 2 * (1 + 2 + 1);
2894 
2895 	return (op_encode_hdr_size + 2 + seg_len + XDR_QUADLEN(rlen)) * sizeof(__be32);
2896 }
2897 
2898 static u32 nfsd4_readdir_rsize(const struct svc_rqst *rqstp,
2899 			       const struct nfsd4_op *op)
2900 {
2901 	u32 rlen = min(op->u.readdir.rd_maxcount, nfsd4_max_payload(rqstp));
2902 
2903 	return (op_encode_hdr_size + op_encode_verifier_maxsz +
2904 		XDR_QUADLEN(rlen)) * sizeof(__be32);
2905 }
2906 
2907 static u32 nfsd4_readlink_rsize(const struct svc_rqst *rqstp,
2908 				const struct nfsd4_op *op)
2909 {
2910 	return (op_encode_hdr_size + 1) * sizeof(__be32) + PAGE_SIZE;
2911 }
2912 
2913 static u32 nfsd4_remove_rsize(const struct svc_rqst *rqstp,
2914 			      const struct nfsd4_op *op)
2915 {
2916 	return (op_encode_hdr_size + op_encode_change_info_maxsz)
2917 		* sizeof(__be32);
2918 }
2919 
2920 static u32 nfsd4_rename_rsize(const struct svc_rqst *rqstp,
2921 			      const struct nfsd4_op *op)
2922 {
2923 	return (op_encode_hdr_size + op_encode_change_info_maxsz
2924 		+ op_encode_change_info_maxsz) * sizeof(__be32);
2925 }
2926 
2927 static u32 nfsd4_sequence_rsize(const struct svc_rqst *rqstp,
2928 				const struct nfsd4_op *op)
2929 {
2930 	return (op_encode_hdr_size
2931 		+ XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5) * sizeof(__be32);
2932 }
2933 
2934 static u32 nfsd4_test_stateid_rsize(const struct svc_rqst *rqstp,
2935 				    const struct nfsd4_op *op)
2936 {
2937 	return (op_encode_hdr_size + 1 + op->u.test_stateid.ts_num_ids)
2938 		* sizeof(__be32);
2939 }
2940 
2941 static u32 nfsd4_setattr_rsize(const struct svc_rqst *rqstp,
2942 			       const struct nfsd4_op *op)
2943 {
2944 	return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
2945 }
2946 
2947 static u32 nfsd4_secinfo_rsize(const struct svc_rqst *rqstp,
2948 			       const struct nfsd4_op *op)
2949 {
2950 	return (op_encode_hdr_size + RPC_AUTH_MAXFLAVOR *
2951 		(4 + XDR_QUADLEN(GSS_OID_MAX_LEN))) * sizeof(__be32);
2952 }
2953 
2954 static u32 nfsd4_setclientid_rsize(const struct svc_rqst *rqstp,
2955 				   const struct nfsd4_op *op)
2956 {
2957 	return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
2958 								sizeof(__be32);
2959 }
2960 
2961 static u32 nfsd4_write_rsize(const struct svc_rqst *rqstp,
2962 			     const struct nfsd4_op *op)
2963 {
2964 	return (op_encode_hdr_size + 2 + op_encode_verifier_maxsz) * sizeof(__be32);
2965 }
2966 
2967 static u32 nfsd4_exchange_id_rsize(const struct svc_rqst *rqstp,
2968 				   const struct nfsd4_op *op)
2969 {
2970 	return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
2971 		1 + 1 + /* eir_flags, spr_how */\
2972 		4 + /* spo_must_enforce & _allow with bitmap */\
2973 		2 + /*eir_server_owner.so_minor_id */\
2974 		/* eir_server_owner.so_major_id<> */\
2975 		XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
2976 		/* eir_server_scope<> */\
2977 		XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
2978 		1 + /* eir_server_impl_id array length */\
2979 		0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
2980 }
2981 
2982 static u32 nfsd4_bind_conn_to_session_rsize(const struct svc_rqst *rqstp,
2983 					    const struct nfsd4_op *op)
2984 {
2985 	return (op_encode_hdr_size + \
2986 		XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
2987 		2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
2988 }
2989 
2990 static u32 nfsd4_create_session_rsize(const struct svc_rqst *rqstp,
2991 				      const struct nfsd4_op *op)
2992 {
2993 	return (op_encode_hdr_size + \
2994 		XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
2995 		2 + /* csr_sequence, csr_flags */\
2996 		op_encode_channel_attrs_maxsz + \
2997 		op_encode_channel_attrs_maxsz) * sizeof(__be32);
2998 }
2999 
3000 static u32 nfsd4_copy_rsize(const struct svc_rqst *rqstp,
3001 			    const struct nfsd4_op *op)
3002 {
3003 	return (op_encode_hdr_size +
3004 		1 /* wr_callback */ +
3005 		op_encode_stateid_maxsz /* wr_callback */ +
3006 		2 /* wr_count */ +
3007 		1 /* wr_committed */ +
3008 		op_encode_verifier_maxsz +
3009 		1 /* cr_consecutive */ +
3010 		1 /* cr_synchronous */) * sizeof(__be32);
3011 }
3012 
3013 static u32 nfsd4_offload_status_rsize(const struct svc_rqst *rqstp,
3014 				      const struct nfsd4_op *op)
3015 {
3016 	return (op_encode_hdr_size +
3017 		2 /* osr_count */ +
3018 		1 /* osr_complete<1> optional 0 for now */) * sizeof(__be32);
3019 }
3020 
3021 static u32 nfsd4_copy_notify_rsize(const struct svc_rqst *rqstp,
3022 				   const struct nfsd4_op *op)
3023 {
3024 	return (op_encode_hdr_size +
3025 		3 /* cnr_lease_time */ +
3026 		1 /* We support one cnr_source_server */ +
3027 		1 /* cnr_stateid seq */ +
3028 		op_encode_stateid_maxsz /* cnr_stateid */ +
3029 		1 /* num cnr_source_server*/ +
3030 		1 /* nl4_type */ +
3031 		1 /* nl4 size */ +
3032 		XDR_QUADLEN(NFS4_OPAQUE_LIMIT) /*nl4_loc + nl4_loc_sz */)
3033 		* sizeof(__be32);
3034 }
3035 
3036 #ifdef CONFIG_NFSD_PNFS
3037 static u32 nfsd4_getdeviceinfo_rsize(const struct svc_rqst *rqstp,
3038 				     const struct nfsd4_op *op)
3039 {
3040 	u32 rlen = min(op->u.getdeviceinfo.gd_maxcount, nfsd4_max_payload(rqstp));
3041 
3042 	return (op_encode_hdr_size +
3043 		1 /* gd_layout_type*/ +
3044 		XDR_QUADLEN(rlen) +
3045 		2 /* gd_notify_types */) * sizeof(__be32);
3046 }
3047 
3048 /*
3049  * At this stage we don't really know what layout driver will handle the request,
3050  * so we need to define an arbitrary upper bound here.
3051  */
3052 #define MAX_LAYOUT_SIZE		128
3053 static u32 nfsd4_layoutget_rsize(const struct svc_rqst *rqstp,
3054 				 const struct nfsd4_op *op)
3055 {
3056 	return (op_encode_hdr_size +
3057 		1 /* logr_return_on_close */ +
3058 		op_encode_stateid_maxsz +
3059 		1 /* nr of layouts */ +
3060 		MAX_LAYOUT_SIZE) * sizeof(__be32);
3061 }
3062 
3063 static u32 nfsd4_layoutcommit_rsize(const struct svc_rqst *rqstp,
3064 				    const struct nfsd4_op *op)
3065 {
3066 	return (op_encode_hdr_size +
3067 		1 /* locr_newsize */ +
3068 		2 /* ns_size */) * sizeof(__be32);
3069 }
3070 
3071 static u32 nfsd4_layoutreturn_rsize(const struct svc_rqst *rqstp,
3072 				    const struct nfsd4_op *op)
3073 {
3074 	return (op_encode_hdr_size +
3075 		1 /* lrs_stateid */ +
3076 		op_encode_stateid_maxsz) * sizeof(__be32);
3077 }
3078 #endif /* CONFIG_NFSD_PNFS */
3079 
3080 
3081 static u32 nfsd4_seek_rsize(const struct svc_rqst *rqstp,
3082 			    const struct nfsd4_op *op)
3083 {
3084 	return (op_encode_hdr_size + 3) * sizeof(__be32);
3085 }
3086 
3087 static u32 nfsd4_getxattr_rsize(const struct svc_rqst *rqstp,
3088 				const struct nfsd4_op *op)
3089 {
3090 	u32 rlen = min_t(u32, XATTR_SIZE_MAX, nfsd4_max_payload(rqstp));
3091 
3092 	return (op_encode_hdr_size + 1 + XDR_QUADLEN(rlen)) * sizeof(__be32);
3093 }
3094 
3095 static u32 nfsd4_setxattr_rsize(const struct svc_rqst *rqstp,
3096 				const struct nfsd4_op *op)
3097 {
3098 	return (op_encode_hdr_size + op_encode_change_info_maxsz)
3099 		* sizeof(__be32);
3100 }
3101 static u32 nfsd4_listxattrs_rsize(const struct svc_rqst *rqstp,
3102 				  const struct nfsd4_op *op)
3103 {
3104 	u32 rlen = min(op->u.listxattrs.lsxa_maxcount, nfsd4_max_payload(rqstp));
3105 
3106 	return (op_encode_hdr_size + 4 + XDR_QUADLEN(rlen)) * sizeof(__be32);
3107 }
3108 
3109 static u32 nfsd4_removexattr_rsize(const struct svc_rqst *rqstp,
3110 				   const struct nfsd4_op *op)
3111 {
3112 	return (op_encode_hdr_size + op_encode_change_info_maxsz)
3113 		* sizeof(__be32);
3114 }
3115 
3116 
3117 static const struct nfsd4_operation nfsd4_ops[] = {
3118 	[OP_ACCESS] = {
3119 		.op_func = nfsd4_access,
3120 		.op_name = "OP_ACCESS",
3121 		.op_rsize_bop = nfsd4_access_rsize,
3122 	},
3123 	[OP_CLOSE] = {
3124 		.op_func = nfsd4_close,
3125 		.op_flags = OP_MODIFIES_SOMETHING,
3126 		.op_name = "OP_CLOSE",
3127 		.op_rsize_bop = nfsd4_status_stateid_rsize,
3128 		.op_get_currentstateid = nfsd4_get_closestateid,
3129 		.op_set_currentstateid = nfsd4_set_closestateid,
3130 	},
3131 	[OP_COMMIT] = {
3132 		.op_func = nfsd4_commit,
3133 		.op_flags = OP_MODIFIES_SOMETHING,
3134 		.op_name = "OP_COMMIT",
3135 		.op_rsize_bop = nfsd4_commit_rsize,
3136 	},
3137 	[OP_CREATE] = {
3138 		.op_func = nfsd4_create,
3139 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
3140 		.op_name = "OP_CREATE",
3141 		.op_rsize_bop = nfsd4_create_rsize,
3142 	},
3143 	[OP_DELEGRETURN] = {
3144 		.op_func = nfsd4_delegreturn,
3145 		.op_flags = OP_MODIFIES_SOMETHING,
3146 		.op_name = "OP_DELEGRETURN",
3147 		.op_rsize_bop = nfsd4_only_status_rsize,
3148 		.op_get_currentstateid = nfsd4_get_delegreturnstateid,
3149 	},
3150 	[OP_GETATTR] = {
3151 		.op_func = nfsd4_getattr,
3152 		.op_flags = ALLOWED_ON_ABSENT_FS,
3153 		.op_rsize_bop = nfsd4_getattr_rsize,
3154 		.op_name = "OP_GETATTR",
3155 	},
3156 	[OP_GETFH] = {
3157 		.op_func = nfsd4_getfh,
3158 		.op_name = "OP_GETFH",
3159 		.op_rsize_bop = nfsd4_getfh_rsize,
3160 	},
3161 	[OP_LINK] = {
3162 		.op_func = nfsd4_link,
3163 		.op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
3164 				| OP_CACHEME,
3165 		.op_name = "OP_LINK",
3166 		.op_rsize_bop = nfsd4_link_rsize,
3167 	},
3168 	[OP_LOCK] = {
3169 		.op_func = nfsd4_lock,
3170 		.op_flags = OP_MODIFIES_SOMETHING |
3171 				OP_NONTRIVIAL_ERROR_ENCODE,
3172 		.op_name = "OP_LOCK",
3173 		.op_rsize_bop = nfsd4_lock_rsize,
3174 		.op_set_currentstateid = nfsd4_set_lockstateid,
3175 	},
3176 	[OP_LOCKT] = {
3177 		.op_func = nfsd4_lockt,
3178 		.op_flags = OP_NONTRIVIAL_ERROR_ENCODE,
3179 		.op_name = "OP_LOCKT",
3180 		.op_rsize_bop = nfsd4_lock_rsize,
3181 	},
3182 	[OP_LOCKU] = {
3183 		.op_func = nfsd4_locku,
3184 		.op_flags = OP_MODIFIES_SOMETHING,
3185 		.op_name = "OP_LOCKU",
3186 		.op_rsize_bop = nfsd4_status_stateid_rsize,
3187 		.op_get_currentstateid = nfsd4_get_lockustateid,
3188 	},
3189 	[OP_LOOKUP] = {
3190 		.op_func = nfsd4_lookup,
3191 		.op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
3192 		.op_name = "OP_LOOKUP",
3193 		.op_rsize_bop = nfsd4_only_status_rsize,
3194 	},
3195 	[OP_LOOKUPP] = {
3196 		.op_func = nfsd4_lookupp,
3197 		.op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
3198 		.op_name = "OP_LOOKUPP",
3199 		.op_rsize_bop = nfsd4_only_status_rsize,
3200 	},
3201 	[OP_NVERIFY] = {
3202 		.op_func = nfsd4_nverify,
3203 		.op_name = "OP_NVERIFY",
3204 		.op_rsize_bop = nfsd4_only_status_rsize,
3205 	},
3206 	[OP_OPEN] = {
3207 		.op_func = nfsd4_open,
3208 		.op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
3209 		.op_name = "OP_OPEN",
3210 		.op_rsize_bop = nfsd4_open_rsize,
3211 		.op_set_currentstateid = nfsd4_set_openstateid,
3212 	},
3213 	[OP_OPEN_CONFIRM] = {
3214 		.op_func = nfsd4_open_confirm,
3215 		.op_flags = OP_MODIFIES_SOMETHING,
3216 		.op_name = "OP_OPEN_CONFIRM",
3217 		.op_rsize_bop = nfsd4_status_stateid_rsize,
3218 	},
3219 	[OP_OPEN_DOWNGRADE] = {
3220 		.op_func = nfsd4_open_downgrade,
3221 		.op_flags = OP_MODIFIES_SOMETHING,
3222 		.op_name = "OP_OPEN_DOWNGRADE",
3223 		.op_rsize_bop = nfsd4_status_stateid_rsize,
3224 		.op_get_currentstateid = nfsd4_get_opendowngradestateid,
3225 		.op_set_currentstateid = nfsd4_set_opendowngradestateid,
3226 	},
3227 	[OP_PUTFH] = {
3228 		.op_func = nfsd4_putfh,
3229 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3230 				| OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
3231 		.op_name = "OP_PUTFH",
3232 		.op_rsize_bop = nfsd4_only_status_rsize,
3233 	},
3234 	[OP_PUTPUBFH] = {
3235 		.op_func = nfsd4_putrootfh,
3236 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3237 				| OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
3238 		.op_name = "OP_PUTPUBFH",
3239 		.op_rsize_bop = nfsd4_only_status_rsize,
3240 	},
3241 	[OP_PUTROOTFH] = {
3242 		.op_func = nfsd4_putrootfh,
3243 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3244 				| OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
3245 		.op_name = "OP_PUTROOTFH",
3246 		.op_rsize_bop = nfsd4_only_status_rsize,
3247 	},
3248 	[OP_READ] = {
3249 		.op_func = nfsd4_read,
3250 		.op_release = nfsd4_read_release,
3251 		.op_name = "OP_READ",
3252 		.op_rsize_bop = nfsd4_read_rsize,
3253 		.op_get_currentstateid = nfsd4_get_readstateid,
3254 	},
3255 	[OP_READDIR] = {
3256 		.op_func = nfsd4_readdir,
3257 		.op_name = "OP_READDIR",
3258 		.op_rsize_bop = nfsd4_readdir_rsize,
3259 	},
3260 	[OP_READLINK] = {
3261 		.op_func = nfsd4_readlink,
3262 		.op_name = "OP_READLINK",
3263 		.op_rsize_bop = nfsd4_readlink_rsize,
3264 	},
3265 	[OP_REMOVE] = {
3266 		.op_func = nfsd4_remove,
3267 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
3268 		.op_name = "OP_REMOVE",
3269 		.op_rsize_bop = nfsd4_remove_rsize,
3270 	},
3271 	[OP_RENAME] = {
3272 		.op_func = nfsd4_rename,
3273 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
3274 		.op_name = "OP_RENAME",
3275 		.op_rsize_bop = nfsd4_rename_rsize,
3276 	},
3277 	[OP_RENEW] = {
3278 		.op_func = nfsd4_renew,
3279 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3280 				| OP_MODIFIES_SOMETHING,
3281 		.op_name = "OP_RENEW",
3282 		.op_rsize_bop = nfsd4_only_status_rsize,
3283 
3284 	},
3285 	[OP_RESTOREFH] = {
3286 		.op_func = nfsd4_restorefh,
3287 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3288 				| OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
3289 		.op_name = "OP_RESTOREFH",
3290 		.op_rsize_bop = nfsd4_only_status_rsize,
3291 	},
3292 	[OP_SAVEFH] = {
3293 		.op_func = nfsd4_savefh,
3294 		.op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
3295 		.op_name = "OP_SAVEFH",
3296 		.op_rsize_bop = nfsd4_only_status_rsize,
3297 	},
3298 	[OP_SECINFO] = {
3299 		.op_func = nfsd4_secinfo,
3300 		.op_release = nfsd4_secinfo_release,
3301 		.op_flags = OP_HANDLES_WRONGSEC,
3302 		.op_name = "OP_SECINFO",
3303 		.op_rsize_bop = nfsd4_secinfo_rsize,
3304 	},
3305 	[OP_SETATTR] = {
3306 		.op_func = nfsd4_setattr,
3307 		.op_name = "OP_SETATTR",
3308 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME
3309 				| OP_NONTRIVIAL_ERROR_ENCODE,
3310 		.op_rsize_bop = nfsd4_setattr_rsize,
3311 		.op_get_currentstateid = nfsd4_get_setattrstateid,
3312 	},
3313 	[OP_SETCLIENTID] = {
3314 		.op_func = nfsd4_setclientid,
3315 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3316 				| OP_MODIFIES_SOMETHING | OP_CACHEME
3317 				| OP_NONTRIVIAL_ERROR_ENCODE,
3318 		.op_name = "OP_SETCLIENTID",
3319 		.op_rsize_bop = nfsd4_setclientid_rsize,
3320 	},
3321 	[OP_SETCLIENTID_CONFIRM] = {
3322 		.op_func = nfsd4_setclientid_confirm,
3323 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3324 				| OP_MODIFIES_SOMETHING | OP_CACHEME,
3325 		.op_name = "OP_SETCLIENTID_CONFIRM",
3326 		.op_rsize_bop = nfsd4_only_status_rsize,
3327 	},
3328 	[OP_VERIFY] = {
3329 		.op_func = nfsd4_verify,
3330 		.op_name = "OP_VERIFY",
3331 		.op_rsize_bop = nfsd4_only_status_rsize,
3332 	},
3333 	[OP_WRITE] = {
3334 		.op_func = nfsd4_write,
3335 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
3336 		.op_name = "OP_WRITE",
3337 		.op_rsize_bop = nfsd4_write_rsize,
3338 		.op_get_currentstateid = nfsd4_get_writestateid,
3339 	},
3340 	[OP_RELEASE_LOCKOWNER] = {
3341 		.op_func = nfsd4_release_lockowner,
3342 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3343 				| OP_MODIFIES_SOMETHING,
3344 		.op_name = "OP_RELEASE_LOCKOWNER",
3345 		.op_rsize_bop = nfsd4_only_status_rsize,
3346 	},
3347 
3348 	/* NFSv4.1 operations */
3349 	[OP_EXCHANGE_ID] = {
3350 		.op_func = nfsd4_exchange_id,
3351 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
3352 				| OP_MODIFIES_SOMETHING,
3353 		.op_name = "OP_EXCHANGE_ID",
3354 		.op_rsize_bop = nfsd4_exchange_id_rsize,
3355 	},
3356 	[OP_BACKCHANNEL_CTL] = {
3357 		.op_func = nfsd4_backchannel_ctl,
3358 		.op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
3359 		.op_name = "OP_BACKCHANNEL_CTL",
3360 		.op_rsize_bop = nfsd4_only_status_rsize,
3361 	},
3362 	[OP_BIND_CONN_TO_SESSION] = {
3363 		.op_func = nfsd4_bind_conn_to_session,
3364 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
3365 				| OP_MODIFIES_SOMETHING,
3366 		.op_name = "OP_BIND_CONN_TO_SESSION",
3367 		.op_rsize_bop = nfsd4_bind_conn_to_session_rsize,
3368 	},
3369 	[OP_CREATE_SESSION] = {
3370 		.op_func = nfsd4_create_session,
3371 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
3372 				| OP_MODIFIES_SOMETHING,
3373 		.op_name = "OP_CREATE_SESSION",
3374 		.op_rsize_bop = nfsd4_create_session_rsize,
3375 	},
3376 	[OP_DESTROY_SESSION] = {
3377 		.op_func = nfsd4_destroy_session,
3378 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
3379 				| OP_MODIFIES_SOMETHING,
3380 		.op_name = "OP_DESTROY_SESSION",
3381 		.op_rsize_bop = nfsd4_only_status_rsize,
3382 	},
3383 	[OP_SEQUENCE] = {
3384 		.op_func = nfsd4_sequence,
3385 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
3386 		.op_name = "OP_SEQUENCE",
3387 		.op_rsize_bop = nfsd4_sequence_rsize,
3388 	},
3389 	[OP_DESTROY_CLIENTID] = {
3390 		.op_func = nfsd4_destroy_clientid,
3391 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
3392 				| OP_MODIFIES_SOMETHING,
3393 		.op_name = "OP_DESTROY_CLIENTID",
3394 		.op_rsize_bop = nfsd4_only_status_rsize,
3395 	},
3396 	[OP_RECLAIM_COMPLETE] = {
3397 		.op_func = nfsd4_reclaim_complete,
3398 		.op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
3399 		.op_name = "OP_RECLAIM_COMPLETE",
3400 		.op_rsize_bop = nfsd4_only_status_rsize,
3401 	},
3402 	[OP_SECINFO_NO_NAME] = {
3403 		.op_func = nfsd4_secinfo_no_name,
3404 		.op_release = nfsd4_secinfo_no_name_release,
3405 		.op_flags = OP_HANDLES_WRONGSEC,
3406 		.op_name = "OP_SECINFO_NO_NAME",
3407 		.op_rsize_bop = nfsd4_secinfo_rsize,
3408 	},
3409 	[OP_TEST_STATEID] = {
3410 		.op_func = nfsd4_test_stateid,
3411 		.op_flags = ALLOWED_WITHOUT_FH,
3412 		.op_name = "OP_TEST_STATEID",
3413 		.op_rsize_bop = nfsd4_test_stateid_rsize,
3414 	},
3415 	[OP_FREE_STATEID] = {
3416 		.op_func = nfsd4_free_stateid,
3417 		.op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
3418 		.op_name = "OP_FREE_STATEID",
3419 		.op_get_currentstateid = nfsd4_get_freestateid,
3420 		.op_rsize_bop = nfsd4_only_status_rsize,
3421 	},
3422 #ifdef CONFIG_NFSD_PNFS
3423 	[OP_GETDEVICEINFO] = {
3424 		.op_func = nfsd4_getdeviceinfo,
3425 		.op_release = nfsd4_getdeviceinfo_release,
3426 		.op_flags = ALLOWED_WITHOUT_FH,
3427 		.op_name = "OP_GETDEVICEINFO",
3428 		.op_rsize_bop = nfsd4_getdeviceinfo_rsize,
3429 	},
3430 	[OP_LAYOUTGET] = {
3431 		.op_func = nfsd4_layoutget,
3432 		.op_release = nfsd4_layoutget_release,
3433 		.op_flags = OP_MODIFIES_SOMETHING,
3434 		.op_name = "OP_LAYOUTGET",
3435 		.op_rsize_bop = nfsd4_layoutget_rsize,
3436 	},
3437 	[OP_LAYOUTCOMMIT] = {
3438 		.op_func = nfsd4_layoutcommit,
3439 		.op_flags = OP_MODIFIES_SOMETHING,
3440 		.op_name = "OP_LAYOUTCOMMIT",
3441 		.op_rsize_bop = nfsd4_layoutcommit_rsize,
3442 	},
3443 	[OP_LAYOUTRETURN] = {
3444 		.op_func = nfsd4_layoutreturn,
3445 		.op_flags = OP_MODIFIES_SOMETHING,
3446 		.op_name = "OP_LAYOUTRETURN",
3447 		.op_rsize_bop = nfsd4_layoutreturn_rsize,
3448 	},
3449 #endif /* CONFIG_NFSD_PNFS */
3450 
3451 	/* NFSv4.2 operations */
3452 	[OP_ALLOCATE] = {
3453 		.op_func = nfsd4_allocate,
3454 		.op_flags = OP_MODIFIES_SOMETHING,
3455 		.op_name = "OP_ALLOCATE",
3456 		.op_rsize_bop = nfsd4_only_status_rsize,
3457 	},
3458 	[OP_DEALLOCATE] = {
3459 		.op_func = nfsd4_deallocate,
3460 		.op_flags = OP_MODIFIES_SOMETHING,
3461 		.op_name = "OP_DEALLOCATE",
3462 		.op_rsize_bop = nfsd4_only_status_rsize,
3463 	},
3464 	[OP_CLONE] = {
3465 		.op_func = nfsd4_clone,
3466 		.op_flags = OP_MODIFIES_SOMETHING,
3467 		.op_name = "OP_CLONE",
3468 		.op_rsize_bop = nfsd4_only_status_rsize,
3469 	},
3470 	[OP_COPY] = {
3471 		.op_func = nfsd4_copy,
3472 		.op_flags = OP_MODIFIES_SOMETHING,
3473 		.op_name = "OP_COPY",
3474 		.op_rsize_bop = nfsd4_copy_rsize,
3475 	},
3476 	[OP_READ_PLUS] = {
3477 		.op_func = nfsd4_read,
3478 		.op_release = nfsd4_read_release,
3479 		.op_name = "OP_READ_PLUS",
3480 		.op_rsize_bop = nfsd4_read_plus_rsize,
3481 		.op_get_currentstateid = nfsd4_get_readstateid,
3482 	},
3483 	[OP_SEEK] = {
3484 		.op_func = nfsd4_seek,
3485 		.op_name = "OP_SEEK",
3486 		.op_rsize_bop = nfsd4_seek_rsize,
3487 	},
3488 	[OP_OFFLOAD_STATUS] = {
3489 		.op_func = nfsd4_offload_status,
3490 		.op_name = "OP_OFFLOAD_STATUS",
3491 		.op_rsize_bop = nfsd4_offload_status_rsize,
3492 	},
3493 	[OP_OFFLOAD_CANCEL] = {
3494 		.op_func = nfsd4_offload_cancel,
3495 		.op_flags = OP_MODIFIES_SOMETHING,
3496 		.op_name = "OP_OFFLOAD_CANCEL",
3497 		.op_rsize_bop = nfsd4_only_status_rsize,
3498 	},
3499 	[OP_COPY_NOTIFY] = {
3500 		.op_func = nfsd4_copy_notify,
3501 		.op_flags = OP_MODIFIES_SOMETHING,
3502 		.op_name = "OP_COPY_NOTIFY",
3503 		.op_rsize_bop = nfsd4_copy_notify_rsize,
3504 	},
3505 	[OP_GETXATTR] = {
3506 		.op_func = nfsd4_getxattr,
3507 		.op_name = "OP_GETXATTR",
3508 		.op_rsize_bop = nfsd4_getxattr_rsize,
3509 	},
3510 	[OP_SETXATTR] = {
3511 		.op_func = nfsd4_setxattr,
3512 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
3513 		.op_name = "OP_SETXATTR",
3514 		.op_rsize_bop = nfsd4_setxattr_rsize,
3515 	},
3516 	[OP_LISTXATTRS] = {
3517 		.op_func = nfsd4_listxattrs,
3518 		.op_name = "OP_LISTXATTRS",
3519 		.op_rsize_bop = nfsd4_listxattrs_rsize,
3520 	},
3521 	[OP_REMOVEXATTR] = {
3522 		.op_func = nfsd4_removexattr,
3523 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
3524 		.op_name = "OP_REMOVEXATTR",
3525 		.op_rsize_bop = nfsd4_removexattr_rsize,
3526 	},
3527 };
3528 
3529 /**
3530  * nfsd4_spo_must_allow - Determine if the compound op contains an
3531  * operation that is allowed to be sent with machine credentials
3532  *
3533  * @rqstp: a pointer to the struct svc_rqst
3534  *
3535  * Checks to see if the compound contains a spo_must_allow op
3536  * and confirms that it was sent with the proper machine creds.
3537  */
3538 
3539 bool nfsd4_spo_must_allow(struct svc_rqst *rqstp)
3540 {
3541 	struct nfsd4_compoundres *resp = rqstp->rq_resp;
3542 	struct nfsd4_compoundargs *argp = rqstp->rq_argp;
3543 	struct nfsd4_op *this;
3544 	struct nfsd4_compound_state *cstate = &resp->cstate;
3545 	struct nfs4_op_map *allow = &cstate->clp->cl_spo_must_allow;
3546 	u32 opiter;
3547 
3548 	if (!cstate->minorversion)
3549 		return false;
3550 
3551 	if (cstate->spo_must_allowed)
3552 		return true;
3553 
3554 	opiter = resp->opcnt;
3555 	while (opiter < argp->opcnt) {
3556 		this = &argp->ops[opiter++];
3557 		if (test_bit(this->opnum, allow->u.longs) &&
3558 			cstate->clp->cl_mach_cred &&
3559 			nfsd4_mach_creds_match(cstate->clp, rqstp)) {
3560 			cstate->spo_must_allowed = true;
3561 			return true;
3562 		}
3563 	}
3564 	cstate->spo_must_allowed = false;
3565 	return false;
3566 }
3567 
3568 int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
3569 {
3570 	if (op->opnum == OP_ILLEGAL || op->status == nfserr_notsupp)
3571 		return op_encode_hdr_size * sizeof(__be32);
3572 
3573 	BUG_ON(OPDESC(op)->op_rsize_bop == NULL);
3574 	return OPDESC(op)->op_rsize_bop(rqstp, op);
3575 }
3576 
3577 void warn_on_nonidempotent_op(struct nfsd4_op *op)
3578 {
3579 	if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
3580 		pr_err("unable to encode reply to nonidempotent op %u (%s)\n",
3581 			op->opnum, nfsd4_op_name(op->opnum));
3582 		WARN_ON_ONCE(1);
3583 	}
3584 }
3585 
3586 static const char *nfsd4_op_name(unsigned opnum)
3587 {
3588 	if (opnum < ARRAY_SIZE(nfsd4_ops))
3589 		return nfsd4_ops[opnum].op_name;
3590 	return "unknown_operation";
3591 }
3592 
3593 static const struct svc_procedure nfsd_procedures4[2] = {
3594 	[NFSPROC4_NULL] = {
3595 		.pc_func = nfsd4_proc_null,
3596 		.pc_decode = nfssvc_decode_voidarg,
3597 		.pc_encode = nfssvc_encode_voidres,
3598 		.pc_argsize = sizeof(struct nfsd_voidargs),
3599 		.pc_argzero = sizeof(struct nfsd_voidargs),
3600 		.pc_ressize = sizeof(struct nfsd_voidres),
3601 		.pc_cachetype = RC_NOCACHE,
3602 		.pc_xdrressize = 1,
3603 		.pc_name = "NULL",
3604 	},
3605 	[NFSPROC4_COMPOUND] = {
3606 		.pc_func = nfsd4_proc_compound,
3607 		.pc_decode = nfs4svc_decode_compoundargs,
3608 		.pc_encode = nfs4svc_encode_compoundres,
3609 		.pc_argsize = sizeof(struct nfsd4_compoundargs),
3610 		.pc_argzero = offsetof(struct nfsd4_compoundargs, iops),
3611 		.pc_ressize = sizeof(struct nfsd4_compoundres),
3612 		.pc_release = nfsd4_release_compoundargs,
3613 		.pc_cachetype = RC_NOCACHE,
3614 		.pc_xdrressize = NFSD_BUFSIZE/4,
3615 		.pc_name = "COMPOUND",
3616 	},
3617 };
3618 
3619 static DEFINE_PER_CPU_ALIGNED(unsigned long,
3620 			      nfsd_count4[ARRAY_SIZE(nfsd_procedures4)]);
3621 const struct svc_version nfsd_version4 = {
3622 	.vs_vers		= 4,
3623 	.vs_nproc		= ARRAY_SIZE(nfsd_procedures4),
3624 	.vs_proc		= nfsd_procedures4,
3625 	.vs_count		= nfsd_count4,
3626 	.vs_dispatch		= nfsd_dispatch,
3627 	.vs_xdrsize		= NFS4_SVC_XDRSIZE,
3628 	.vs_rpcb_optnl		= true,
3629 	.vs_need_cong_ctrl	= true,
3630 };
3631