xref: /openbmc/linux/fs/nfsd/nfs4proc.c (revision b670a598)
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
check_attr_support(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,u32 * bmval,u32 * writable)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
nfsd4_check_open_attributes(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,struct nfsd4_open * open)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
is_create_with_attrs(struct nfsd4_open * open)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
fh_dup2(struct svc_fh * dst,struct svc_fh * src)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
do_open_permission(struct svc_rqst * rqstp,struct svc_fh * current_fh,struct nfsd4_open * open,int accmode)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 
nfsd_check_obj_isreg(struct svc_fh * fh)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 
nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state * cstate,struct nfsd4_open * open,struct svc_fh * resfh)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 
nfsd4_create_is_exclusive(int createmode)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
nfsd4_vfs_create(struct svc_fh * fhp,struct dentry * child,struct nfsd4_open * open)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
nfsd4_create_file(struct svc_rqst * rqstp,struct svc_fh * fhp,struct svc_fh * resfhp,struct nfsd4_open * open)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 		/* NFSv4 protocol requires change attributes even though
301 		 * no change happened.
302 		 */
303 		status = fh_fill_both_attrs(fhp);
304 		if (status != nfs_ok)
305 			goto out;
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 	status = fh_fill_pre_attrs(fhp);
349 	if (status != nfs_ok)
350 		goto out;
351 	status = nfsd4_vfs_create(fhp, child, open);
352 	if (status != nfs_ok)
353 		goto out;
354 	open->op_created = true;
355 	fh_fill_post_attrs(fhp);
356 
357 	/* A newly created file already has a file size of zero. */
358 	if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0))
359 		iap->ia_valid &= ~ATTR_SIZE;
360 	if (nfsd4_create_is_exclusive(open->op_createmode)) {
361 		iap->ia_valid = ATTR_MTIME | ATTR_ATIME |
362 				ATTR_MTIME_SET|ATTR_ATIME_SET;
363 		iap->ia_mtime.tv_sec = v_mtime;
364 		iap->ia_atime.tv_sec = v_atime;
365 		iap->ia_mtime.tv_nsec = 0;
366 		iap->ia_atime.tv_nsec = 0;
367 	}
368 
369 set_attr:
370 	status = nfsd_create_setattr(rqstp, fhp, resfhp, &attrs);
371 
372 	if (attrs.na_labelerr)
373 		open->op_bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
374 	if (attrs.na_aclerr)
375 		open->op_bmval[0] &= ~FATTR4_WORD0_ACL;
376 out:
377 	inode_unlock(inode);
378 	nfsd_attrs_free(&attrs);
379 	if (child && !IS_ERR(child))
380 		dput(child);
381 	fh_drop_write(fhp);
382 	return status;
383 }
384 
385 /**
386  * set_change_info - set up the change_info4 for a reply
387  * @cinfo: pointer to nfsd4_change_info to be populated
388  * @fhp: pointer to svc_fh to use as source
389  *
390  * Many operations in NFSv4 require change_info4 in the reply. This function
391  * populates that from the info that we (should!) have already collected. In
392  * the event that we didn't get any pre-attrs, just zero out both.
393  */
394 static void
set_change_info(struct nfsd4_change_info * cinfo,struct svc_fh * fhp)395 set_change_info(struct nfsd4_change_info *cinfo, struct svc_fh *fhp)
396 {
397 	cinfo->atomic = (u32)(fhp->fh_pre_saved && fhp->fh_post_saved && !fhp->fh_no_atomic_attr);
398 	cinfo->before_change = fhp->fh_pre_change;
399 	cinfo->after_change = fhp->fh_post_change;
400 
401 	/*
402 	 * If fetching the pre-change attributes failed, then we should
403 	 * have already failed the whole operation. We could have still
404 	 * failed to fetch post-change attributes however.
405 	 *
406 	 * If we didn't get post-op attrs, just zero-out the after
407 	 * field since we don't know what it should be. If the pre_saved
408 	 * field isn't set for some reason, throw warning and just copy
409 	 * whatever is in the after field.
410 	 */
411 	if (WARN_ON_ONCE(!fhp->fh_pre_saved))
412 		cinfo->before_change = 0;
413 	if (!fhp->fh_post_saved)
414 		cinfo->after_change = cinfo->before_change + 1;
415 }
416 
417 static __be32
do_open_lookup(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,struct nfsd4_open * open,struct svc_fh ** resfh)418 do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh **resfh)
419 {
420 	struct svc_fh *current_fh = &cstate->current_fh;
421 	int accmode;
422 	__be32 status;
423 
424 	*resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
425 	if (!*resfh)
426 		return nfserr_jukebox;
427 	fh_init(*resfh, NFS4_FHSIZE);
428 	open->op_truncate = false;
429 
430 	if (open->op_create) {
431 		/* FIXME: check session persistence and pnfs flags.
432 		 * The nfsv4.1 spec requires the following semantics:
433 		 *
434 		 * Persistent   | pNFS   | Server REQUIRED | Client Allowed
435 		 * Reply Cache  | server |                 |
436 		 * -------------+--------+-----------------+--------------------
437 		 * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
438 		 *              |        |                 | (SHOULD)
439 		 *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
440 		 *              |        |                 | (SHOULD NOT)
441 		 * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
442 		 * yes          | no     | GUARDED4        | GUARDED4
443 		 * yes          | yes    | GUARDED4        | GUARDED4
444 		 */
445 
446 		current->fs->umask = open->op_umask;
447 		status = nfsd4_create_file(rqstp, current_fh, *resfh, open);
448 		current->fs->umask = 0;
449 
450 		/*
451 		 * Following rfc 3530 14.2.16, and rfc 5661 18.16.4
452 		 * use the returned bitmask to indicate which attributes
453 		 * we used to store the verifier:
454 		 */
455 		if (nfsd4_create_is_exclusive(open->op_createmode) && status == 0)
456 			open->op_bmval[1] |= (FATTR4_WORD1_TIME_ACCESS |
457 						FATTR4_WORD1_TIME_MODIFY);
458 	} else {
459 		status = nfsd_lookup(rqstp, current_fh,
460 				     open->op_fname, open->op_fnamelen, *resfh);
461 		if (status == nfs_ok)
462 			/* NFSv4 protocol requires change attributes even though
463 			 * no change happened.
464 			 */
465 			status = fh_fill_both_attrs(current_fh);
466 	}
467 	if (status)
468 		goto out;
469 	status = nfsd_check_obj_isreg(*resfh);
470 	if (status)
471 		goto out;
472 
473 	nfsd4_set_open_owner_reply_cache(cstate, open, *resfh);
474 	accmode = NFSD_MAY_NOP;
475 	if (open->op_created ||
476 			open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
477 		accmode |= NFSD_MAY_OWNER_OVERRIDE;
478 	status = do_open_permission(rqstp, *resfh, open, accmode);
479 	set_change_info(&open->op_cinfo, current_fh);
480 out:
481 	return status;
482 }
483 
484 static __be32
do_open_fhandle(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,struct nfsd4_open * open)485 do_open_fhandle(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
486 {
487 	struct svc_fh *current_fh = &cstate->current_fh;
488 	int accmode = 0;
489 
490 	/* We don't know the target directory, and therefore can not
491 	* set the change info
492 	*/
493 
494 	memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
495 
496 	nfsd4_set_open_owner_reply_cache(cstate, open, current_fh);
497 
498 	open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
499 		(open->op_iattr.ia_size == 0);
500 	/*
501 	 * In the delegation case, the client is telling us about an
502 	 * open that it *already* performed locally, some time ago.  We
503 	 * should let it succeed now if possible.
504 	 *
505 	 * In the case of a CLAIM_FH open, on the other hand, the client
506 	 * may be counting on us to enforce permissions (the Linux 4.1
507 	 * client uses this for normal opens, for example).
508 	 */
509 	if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
510 		accmode = NFSD_MAY_OWNER_OVERRIDE;
511 
512 	return do_open_permission(rqstp, current_fh, open, accmode);
513 }
514 
515 static void
copy_clientid(clientid_t * clid,struct nfsd4_session * session)516 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
517 {
518 	struct nfsd4_sessionid *sid =
519 			(struct nfsd4_sessionid *)session->se_sessionid.data;
520 
521 	clid->cl_boot = sid->clientid.cl_boot;
522 	clid->cl_id = sid->clientid.cl_id;
523 }
524 
525 static __be32
nfsd4_open(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)526 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
527 	   union nfsd4_op_u *u)
528 {
529 	struct nfsd4_open *open = &u->open;
530 	__be32 status;
531 	struct svc_fh *resfh = NULL;
532 	struct net *net = SVC_NET(rqstp);
533 	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
534 	bool reclaim = false;
535 
536 	dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
537 		(int)open->op_fnamelen, open->op_fname,
538 		open->op_openowner);
539 
540 	open->op_filp = NULL;
541 	open->op_rqstp = rqstp;
542 
543 	/* This check required by spec. */
544 	if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
545 		return nfserr_inval;
546 
547 	open->op_created = false;
548 	/*
549 	 * RFC5661 18.51.3
550 	 * Before RECLAIM_COMPLETE done, server should deny new lock
551 	 */
552 	if (nfsd4_has_session(cstate) &&
553 	    !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &cstate->clp->cl_flags) &&
554 	    open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
555 		return nfserr_grace;
556 
557 	if (nfsd4_has_session(cstate))
558 		copy_clientid(&open->op_clientid, cstate->session);
559 
560 	/* check seqid for replay. set nfs4_owner */
561 	status = nfsd4_process_open1(cstate, open, nn);
562 	if (status == nfserr_replay_me) {
563 		struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
564 		fh_put(&cstate->current_fh);
565 		fh_copy_shallow(&cstate->current_fh.fh_handle,
566 				&rp->rp_openfh);
567 		status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
568 		if (status)
569 			dprintk("nfsd4_open: replay failed"
570 				" restoring previous filehandle\n");
571 		else
572 			status = nfserr_replay_me;
573 	}
574 	if (status)
575 		goto out;
576 	if (open->op_xdr_error) {
577 		status = open->op_xdr_error;
578 		goto out;
579 	}
580 
581 	status = nfsd4_check_open_attributes(rqstp, cstate, open);
582 	if (status)
583 		goto out;
584 
585 	/* Openowner is now set, so sequence id will get bumped.  Now we need
586 	 * these checks before we do any creates: */
587 	status = nfserr_grace;
588 	if (opens_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
589 		goto out;
590 	status = nfserr_no_grace;
591 	if (!opens_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
592 		goto out;
593 
594 	switch (open->op_claim_type) {
595 	case NFS4_OPEN_CLAIM_DELEGATE_CUR:
596 	case NFS4_OPEN_CLAIM_NULL:
597 		status = do_open_lookup(rqstp, cstate, open, &resfh);
598 		if (status)
599 			goto out;
600 		break;
601 	case NFS4_OPEN_CLAIM_PREVIOUS:
602 		status = nfs4_check_open_reclaim(cstate->clp);
603 		if (status)
604 			goto out;
605 		open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
606 		reclaim = true;
607 		fallthrough;
608 	case NFS4_OPEN_CLAIM_FH:
609 	case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
610 		status = do_open_fhandle(rqstp, cstate, open);
611 		if (status)
612 			goto out;
613 		resfh = &cstate->current_fh;
614 		break;
615 	case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
616 	case NFS4_OPEN_CLAIM_DELEGATE_PREV:
617 		status = nfserr_notsupp;
618 		goto out;
619 	default:
620 		status = nfserr_inval;
621 		goto out;
622 	}
623 
624 	status = nfsd4_process_open2(rqstp, resfh, open);
625 	if (status && open->op_created)
626 		pr_warn("nfsd4_process_open2 failed to open newly-created file: status=%u\n",
627 			be32_to_cpu(status));
628 	if (reclaim && !status)
629 		nn->somebody_reclaimed = true;
630 out:
631 	if (open->op_filp) {
632 		fput(open->op_filp);
633 		open->op_filp = NULL;
634 	}
635 	if (resfh && resfh != &cstate->current_fh) {
636 		fh_dup2(&cstate->current_fh, resfh);
637 		fh_put(resfh);
638 		kfree(resfh);
639 	}
640 	nfsd4_cleanup_open_state(cstate, open);
641 	nfsd4_bump_seqid(cstate, status);
642 	return status;
643 }
644 
645 /*
646  * OPEN is the only seqid-mutating operation whose decoding can fail
647  * with a seqid-mutating error (specifically, decoding of user names in
648  * the attributes).  Therefore we have to do some processing to look up
649  * the stateowner so that we can bump the seqid.
650  */
nfsd4_open_omfg(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,struct nfsd4_op * op)651 static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
652 {
653 	struct nfsd4_open *open = &op->u.open;
654 
655 	if (!seqid_mutating_err(ntohl(op->status)))
656 		return op->status;
657 	if (nfsd4_has_session(cstate))
658 		return op->status;
659 	open->op_xdr_error = op->status;
660 	return nfsd4_open(rqstp, cstate, &op->u);
661 }
662 
663 /*
664  * filehandle-manipulating ops.
665  */
666 static __be32
nfsd4_getfh(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)667 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
668 	    union nfsd4_op_u *u)
669 {
670 	u->getfh = &cstate->current_fh;
671 	return nfs_ok;
672 }
673 
674 static __be32
nfsd4_putfh(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)675 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
676 	    union nfsd4_op_u *u)
677 {
678 	struct nfsd4_putfh *putfh = &u->putfh;
679 	__be32 ret;
680 
681 	fh_put(&cstate->current_fh);
682 	cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
683 	memcpy(&cstate->current_fh.fh_handle.fh_raw, putfh->pf_fhval,
684 	       putfh->pf_fhlen);
685 	ret = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
686 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
687 	if (ret == nfserr_stale && putfh->no_verify) {
688 		SET_FH_FLAG(&cstate->current_fh, NFSD4_FH_FOREIGN);
689 		ret = 0;
690 	}
691 #endif
692 	return ret;
693 }
694 
695 static __be32
nfsd4_putrootfh(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)696 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
697 		union nfsd4_op_u *u)
698 {
699 	fh_put(&cstate->current_fh);
700 
701 	return exp_pseudoroot(rqstp, &cstate->current_fh);
702 }
703 
704 static __be32
nfsd4_restorefh(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)705 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
706 		union nfsd4_op_u *u)
707 {
708 	if (!cstate->save_fh.fh_dentry)
709 		return nfserr_restorefh;
710 
711 	fh_dup2(&cstate->current_fh, &cstate->save_fh);
712 	if (HAS_CSTATE_FLAG(cstate, SAVED_STATE_ID_FLAG)) {
713 		memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
714 		SET_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG);
715 	}
716 	return nfs_ok;
717 }
718 
719 static __be32
nfsd4_savefh(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)720 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
721 	     union nfsd4_op_u *u)
722 {
723 	fh_dup2(&cstate->save_fh, &cstate->current_fh);
724 	if (HAS_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG)) {
725 		memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
726 		SET_CSTATE_FLAG(cstate, SAVED_STATE_ID_FLAG);
727 	}
728 	return nfs_ok;
729 }
730 
731 /*
732  * misc nfsv4 ops
733  */
734 static __be32
nfsd4_access(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)735 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
736 	     union nfsd4_op_u *u)
737 {
738 	struct nfsd4_access *access = &u->access;
739 	u32 access_full;
740 
741 	access_full = NFS3_ACCESS_FULL;
742 	if (cstate->minorversion >= 2)
743 		access_full |= NFS4_ACCESS_XALIST | NFS4_ACCESS_XAREAD |
744 			       NFS4_ACCESS_XAWRITE;
745 
746 	if (access->ac_req_access & ~access_full)
747 		return nfserr_inval;
748 
749 	access->ac_resp_access = access->ac_req_access;
750 	return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
751 			   &access->ac_supported);
752 }
753 
gen_boot_verifier(nfs4_verifier * verifier,struct net * net)754 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
755 {
756 	__be32 *verf = (__be32 *)verifier->data;
757 
758 	BUILD_BUG_ON(2*sizeof(*verf) != sizeof(verifier->data));
759 
760 	nfsd_copy_write_verifier(verf, net_generic(net, nfsd_net_id));
761 }
762 
763 static __be32
nfsd4_commit(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)764 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
765 	     union nfsd4_op_u *u)
766 {
767 	struct nfsd4_commit *commit = &u->commit;
768 	struct nfsd_file *nf;
769 	__be32 status;
770 
771 	status = nfsd_file_acquire(rqstp, &cstate->current_fh, NFSD_MAY_WRITE |
772 				   NFSD_MAY_NOT_BREAK_LEASE, &nf);
773 	if (status != nfs_ok)
774 		return status;
775 
776 	status = nfsd_commit(rqstp, &cstate->current_fh, nf, commit->co_offset,
777 			     commit->co_count,
778 			     (__be32 *)commit->co_verf.data);
779 	nfsd_file_put(nf);
780 	return status;
781 }
782 
783 static __be32
nfsd4_create(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)784 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
785 	     union nfsd4_op_u *u)
786 {
787 	struct nfsd4_create *create = &u->create;
788 	struct nfsd_attrs attrs = {
789 		.na_iattr	= &create->cr_iattr,
790 		.na_seclabel	= &create->cr_label,
791 	};
792 	struct svc_fh resfh;
793 	__be32 status;
794 	dev_t rdev;
795 
796 	fh_init(&resfh, NFS4_FHSIZE);
797 
798 	status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_NOP);
799 	if (status)
800 		return status;
801 
802 	status = check_attr_support(rqstp, cstate, create->cr_bmval,
803 				    nfsd_attrmask);
804 	if (status)
805 		return status;
806 
807 	status = nfsd4_acl_to_attr(create->cr_type, create->cr_acl, &attrs);
808 	current->fs->umask = create->cr_umask;
809 	switch (create->cr_type) {
810 	case NF4LNK:
811 		status = nfsd_symlink(rqstp, &cstate->current_fh,
812 				      create->cr_name, create->cr_namelen,
813 				      create->cr_data, &attrs, &resfh);
814 		break;
815 
816 	case NF4BLK:
817 		status = nfserr_inval;
818 		rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
819 		if (MAJOR(rdev) != create->cr_specdata1 ||
820 		    MINOR(rdev) != create->cr_specdata2)
821 			goto out_umask;
822 		status = nfsd_create(rqstp, &cstate->current_fh,
823 				     create->cr_name, create->cr_namelen,
824 				     &attrs, S_IFBLK, rdev, &resfh);
825 		break;
826 
827 	case NF4CHR:
828 		status = nfserr_inval;
829 		rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
830 		if (MAJOR(rdev) != create->cr_specdata1 ||
831 		    MINOR(rdev) != create->cr_specdata2)
832 			goto out_umask;
833 		status = nfsd_create(rqstp, &cstate->current_fh,
834 				     create->cr_name, create->cr_namelen,
835 				     &attrs, S_IFCHR, rdev, &resfh);
836 		break;
837 
838 	case NF4SOCK:
839 		status = nfsd_create(rqstp, &cstate->current_fh,
840 				     create->cr_name, create->cr_namelen,
841 				     &attrs, S_IFSOCK, 0, &resfh);
842 		break;
843 
844 	case NF4FIFO:
845 		status = nfsd_create(rqstp, &cstate->current_fh,
846 				     create->cr_name, create->cr_namelen,
847 				     &attrs, S_IFIFO, 0, &resfh);
848 		break;
849 
850 	case NF4DIR:
851 		create->cr_iattr.ia_valid &= ~ATTR_SIZE;
852 		status = nfsd_create(rqstp, &cstate->current_fh,
853 				     create->cr_name, create->cr_namelen,
854 				     &attrs, S_IFDIR, 0, &resfh);
855 		break;
856 
857 	default:
858 		status = nfserr_badtype;
859 	}
860 
861 	if (status)
862 		goto out;
863 
864 	if (attrs.na_labelerr)
865 		create->cr_bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
866 	if (attrs.na_aclerr)
867 		create->cr_bmval[0] &= ~FATTR4_WORD0_ACL;
868 	set_change_info(&create->cr_cinfo, &cstate->current_fh);
869 	fh_dup2(&cstate->current_fh, &resfh);
870 out:
871 	fh_put(&resfh);
872 out_umask:
873 	current->fs->umask = 0;
874 	nfsd_attrs_free(&attrs);
875 	return status;
876 }
877 
878 static __be32
nfsd4_getattr(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)879 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
880 	      union nfsd4_op_u *u)
881 {
882 	struct nfsd4_getattr *getattr = &u->getattr;
883 	__be32 status;
884 
885 	status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
886 	if (status)
887 		return status;
888 
889 	if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
890 		return nfserr_inval;
891 
892 	getattr->ga_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
893 	getattr->ga_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
894 	getattr->ga_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
895 
896 	getattr->ga_fhp = &cstate->current_fh;
897 	return nfs_ok;
898 }
899 
900 static __be32
nfsd4_link(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)901 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
902 	   union nfsd4_op_u *u)
903 {
904 	struct nfsd4_link *link = &u->link;
905 	__be32 status;
906 
907 	status = nfsd_link(rqstp, &cstate->current_fh,
908 			   link->li_name, link->li_namelen, &cstate->save_fh);
909 	if (!status)
910 		set_change_info(&link->li_cinfo, &cstate->current_fh);
911 	return status;
912 }
913 
nfsd4_do_lookupp(struct svc_rqst * rqstp,struct svc_fh * fh)914 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
915 {
916 	struct svc_fh tmp_fh;
917 	__be32 ret;
918 
919 	fh_init(&tmp_fh, NFS4_FHSIZE);
920 	ret = exp_pseudoroot(rqstp, &tmp_fh);
921 	if (ret)
922 		return ret;
923 	if (tmp_fh.fh_dentry == fh->fh_dentry) {
924 		fh_put(&tmp_fh);
925 		return nfserr_noent;
926 	}
927 	fh_put(&tmp_fh);
928 	return nfsd_lookup(rqstp, fh, "..", 2, fh);
929 }
930 
931 static __be32
nfsd4_lookupp(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)932 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
933 	      union nfsd4_op_u *u)
934 {
935 	return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
936 }
937 
938 static __be32
nfsd4_lookup(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)939 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
940 	     union nfsd4_op_u *u)
941 {
942 	return nfsd_lookup(rqstp, &cstate->current_fh,
943 			   u->lookup.lo_name, u->lookup.lo_len,
944 			   &cstate->current_fh);
945 }
946 
947 static __be32
nfsd4_read(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)948 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
949 	   union nfsd4_op_u *u)
950 {
951 	struct nfsd4_read *read = &u->read;
952 	__be32 status;
953 
954 	read->rd_nf = NULL;
955 
956 	trace_nfsd_read_start(rqstp, &cstate->current_fh,
957 			      read->rd_offset, read->rd_length);
958 
959 	read->rd_length = min_t(u32, read->rd_length, svc_max_payload(rqstp));
960 	if (read->rd_offset > (u64)OFFSET_MAX)
961 		read->rd_offset = (u64)OFFSET_MAX;
962 	if (read->rd_offset + read->rd_length > (u64)OFFSET_MAX)
963 		read->rd_length = (u64)OFFSET_MAX - read->rd_offset;
964 
965 	/*
966 	 * If we do a zero copy read, then a client will see read data
967 	 * that reflects the state of the file *after* performing the
968 	 * following compound.
969 	 *
970 	 * To ensure proper ordering, we therefore turn off zero copy if
971 	 * the client wants us to do more in this compound:
972 	 */
973 	if (!nfsd4_last_compound_op(rqstp))
974 		clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
975 
976 	/* check stateid */
977 	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
978 					&read->rd_stateid, RD_STATE,
979 					&read->rd_nf, NULL);
980 
981 	read->rd_rqstp = rqstp;
982 	read->rd_fhp = &cstate->current_fh;
983 	return status;
984 }
985 
986 
987 static void
nfsd4_read_release(union nfsd4_op_u * u)988 nfsd4_read_release(union nfsd4_op_u *u)
989 {
990 	if (u->read.rd_nf)
991 		nfsd_file_put(u->read.rd_nf);
992 	trace_nfsd_read_done(u->read.rd_rqstp, u->read.rd_fhp,
993 			     u->read.rd_offset, u->read.rd_length);
994 }
995 
996 static __be32
nfsd4_readdir(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)997 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
998 	      union nfsd4_op_u *u)
999 {
1000 	struct nfsd4_readdir *readdir = &u->readdir;
1001 	u64 cookie = readdir->rd_cookie;
1002 	static const nfs4_verifier zeroverf;
1003 
1004 	/* no need to check permission - this will be done in nfsd_readdir() */
1005 
1006 	if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
1007 		return nfserr_inval;
1008 
1009 	readdir->rd_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
1010 	readdir->rd_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
1011 	readdir->rd_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
1012 
1013 	if ((cookie == 1) || (cookie == 2) ||
1014 	    (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
1015 		return nfserr_bad_cookie;
1016 
1017 	readdir->rd_rqstp = rqstp;
1018 	readdir->rd_fhp = &cstate->current_fh;
1019 	return nfs_ok;
1020 }
1021 
1022 static __be32
nfsd4_readlink(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)1023 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1024 	       union nfsd4_op_u *u)
1025 {
1026 	u->readlink.rl_rqstp = rqstp;
1027 	u->readlink.rl_fhp = &cstate->current_fh;
1028 	return nfs_ok;
1029 }
1030 
1031 static __be32
nfsd4_remove(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)1032 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1033 	     union nfsd4_op_u *u)
1034 {
1035 	struct nfsd4_remove *remove = &u->remove;
1036 	__be32 status;
1037 
1038 	if (opens_in_grace(SVC_NET(rqstp)))
1039 		return nfserr_grace;
1040 	status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
1041 			     remove->rm_name, remove->rm_namelen);
1042 	if (!status)
1043 		set_change_info(&remove->rm_cinfo, &cstate->current_fh);
1044 	return status;
1045 }
1046 
1047 static __be32
nfsd4_rename(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)1048 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1049 	     union nfsd4_op_u *u)
1050 {
1051 	struct nfsd4_rename *rename = &u->rename;
1052 	__be32 status;
1053 
1054 	if (opens_in_grace(SVC_NET(rqstp)))
1055 		return nfserr_grace;
1056 	status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
1057 			     rename->rn_snamelen, &cstate->current_fh,
1058 			     rename->rn_tname, rename->rn_tnamelen);
1059 	if (status)
1060 		return status;
1061 	set_change_info(&rename->rn_sinfo, &cstate->save_fh);
1062 	set_change_info(&rename->rn_tinfo, &cstate->current_fh);
1063 	return nfs_ok;
1064 }
1065 
1066 static __be32
nfsd4_secinfo(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)1067 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1068 	      union nfsd4_op_u *u)
1069 {
1070 	struct nfsd4_secinfo *secinfo = &u->secinfo;
1071 	struct svc_export *exp;
1072 	struct dentry *dentry;
1073 	__be32 err;
1074 
1075 	err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
1076 	if (err)
1077 		return err;
1078 	err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
1079 				    secinfo->si_name, secinfo->si_namelen,
1080 				    &exp, &dentry);
1081 	if (err)
1082 		return err;
1083 	if (d_really_is_negative(dentry)) {
1084 		exp_put(exp);
1085 		err = nfserr_noent;
1086 	} else
1087 		secinfo->si_exp = exp;
1088 	dput(dentry);
1089 	if (cstate->minorversion)
1090 		/* See rfc 5661 section 2.6.3.1.1.8 */
1091 		fh_put(&cstate->current_fh);
1092 	return err;
1093 }
1094 
1095 static __be32
nfsd4_secinfo_no_name(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)1096 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1097 		union nfsd4_op_u *u)
1098 {
1099 	__be32 err;
1100 
1101 	switch (u->secinfo_no_name.sin_style) {
1102 	case NFS4_SECINFO_STYLE4_CURRENT_FH:
1103 		break;
1104 	case NFS4_SECINFO_STYLE4_PARENT:
1105 		err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
1106 		if (err)
1107 			return err;
1108 		break;
1109 	default:
1110 		return nfserr_inval;
1111 	}
1112 
1113 	u->secinfo_no_name.sin_exp = exp_get(cstate->current_fh.fh_export);
1114 	fh_put(&cstate->current_fh);
1115 	return nfs_ok;
1116 }
1117 
1118 static void
nfsd4_secinfo_release(union nfsd4_op_u * u)1119 nfsd4_secinfo_release(union nfsd4_op_u *u)
1120 {
1121 	if (u->secinfo.si_exp)
1122 		exp_put(u->secinfo.si_exp);
1123 }
1124 
1125 static void
nfsd4_secinfo_no_name_release(union nfsd4_op_u * u)1126 nfsd4_secinfo_no_name_release(union nfsd4_op_u *u)
1127 {
1128 	if (u->secinfo_no_name.sin_exp)
1129 		exp_put(u->secinfo_no_name.sin_exp);
1130 }
1131 
1132 static __be32
nfsd4_setattr(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)1133 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1134 	      union nfsd4_op_u *u)
1135 {
1136 	struct nfsd4_setattr *setattr = &u->setattr;
1137 	struct nfsd_attrs attrs = {
1138 		.na_iattr	= &setattr->sa_iattr,
1139 		.na_seclabel	= &setattr->sa_label,
1140 	};
1141 	struct inode *inode;
1142 	__be32 status = nfs_ok;
1143 	int err;
1144 
1145 	if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
1146 		status = nfs4_preprocess_stateid_op(rqstp, cstate,
1147 				&cstate->current_fh, &setattr->sa_stateid,
1148 				WR_STATE, NULL, NULL);
1149 		if (status)
1150 			return status;
1151 	}
1152 	err = fh_want_write(&cstate->current_fh);
1153 	if (err)
1154 		return nfserrno(err);
1155 	status = nfs_ok;
1156 
1157 	status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
1158 				    nfsd_attrmask);
1159 	if (status)
1160 		goto out;
1161 
1162 	inode = cstate->current_fh.fh_dentry->d_inode;
1163 	status = nfsd4_acl_to_attr(S_ISDIR(inode->i_mode) ? NF4DIR : NF4REG,
1164 				   setattr->sa_acl, &attrs);
1165 
1166 	if (status)
1167 		goto out;
1168 	status = nfsd_setattr(rqstp, &cstate->current_fh, &attrs,
1169 				0, (time64_t)0);
1170 	if (!status)
1171 		status = nfserrno(attrs.na_labelerr);
1172 	if (!status)
1173 		status = nfserrno(attrs.na_aclerr);
1174 out:
1175 	nfsd_attrs_free(&attrs);
1176 	fh_drop_write(&cstate->current_fh);
1177 	return status;
1178 }
1179 
1180 static __be32
nfsd4_write(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)1181 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1182 	    union nfsd4_op_u *u)
1183 {
1184 	struct nfsd4_write *write = &u->write;
1185 	stateid_t *stateid = &write->wr_stateid;
1186 	struct nfsd_file *nf = NULL;
1187 	__be32 status = nfs_ok;
1188 	unsigned long cnt;
1189 	int nvecs;
1190 
1191 	if (write->wr_offset > (u64)OFFSET_MAX ||
1192 	    write->wr_offset + write->wr_buflen > (u64)OFFSET_MAX)
1193 		return nfserr_fbig;
1194 
1195 	cnt = write->wr_buflen;
1196 	trace_nfsd_write_start(rqstp, &cstate->current_fh,
1197 			       write->wr_offset, cnt);
1198 	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1199 						stateid, WR_STATE, &nf, NULL);
1200 	if (status)
1201 		return status;
1202 
1203 	write->wr_how_written = write->wr_stable_how;
1204 
1205 	nvecs = svc_fill_write_vector(rqstp, &write->wr_payload);
1206 	WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1207 
1208 	status = nfsd_vfs_write(rqstp, &cstate->current_fh, nf,
1209 				write->wr_offset, rqstp->rq_vec, nvecs, &cnt,
1210 				write->wr_how_written,
1211 				(__be32 *)write->wr_verifier.data);
1212 	nfsd_file_put(nf);
1213 
1214 	write->wr_bytes_written = cnt;
1215 	trace_nfsd_write_done(rqstp, &cstate->current_fh,
1216 			      write->wr_offset, cnt);
1217 	return status;
1218 }
1219 
1220 static __be32
nfsd4_verify_copy(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,stateid_t * src_stateid,struct nfsd_file ** src,stateid_t * dst_stateid,struct nfsd_file ** dst)1221 nfsd4_verify_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1222 		  stateid_t *src_stateid, struct nfsd_file **src,
1223 		  stateid_t *dst_stateid, struct nfsd_file **dst)
1224 {
1225 	__be32 status;
1226 
1227 	if (!cstate->save_fh.fh_dentry)
1228 		return nfserr_nofilehandle;
1229 
1230 	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->save_fh,
1231 					    src_stateid, RD_STATE, src, NULL);
1232 	if (status)
1233 		goto out;
1234 
1235 	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1236 					    dst_stateid, WR_STATE, dst, NULL);
1237 	if (status)
1238 		goto out_put_src;
1239 
1240 	/* fix up for NFS-specific error code */
1241 	if (!S_ISREG(file_inode((*src)->nf_file)->i_mode) ||
1242 	    !S_ISREG(file_inode((*dst)->nf_file)->i_mode)) {
1243 		status = nfserr_wrong_type;
1244 		goto out_put_dst;
1245 	}
1246 
1247 out:
1248 	return status;
1249 out_put_dst:
1250 	nfsd_file_put(*dst);
1251 	*dst = NULL;
1252 out_put_src:
1253 	nfsd_file_put(*src);
1254 	*src = NULL;
1255 	goto out;
1256 }
1257 
1258 static __be32
nfsd4_clone(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)1259 nfsd4_clone(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1260 		union nfsd4_op_u *u)
1261 {
1262 	struct nfsd4_clone *clone = &u->clone;
1263 	struct nfsd_file *src, *dst;
1264 	__be32 status;
1265 
1266 	status = nfsd4_verify_copy(rqstp, cstate, &clone->cl_src_stateid, &src,
1267 				   &clone->cl_dst_stateid, &dst);
1268 	if (status)
1269 		goto out;
1270 
1271 	status = nfsd4_clone_file_range(rqstp, src, clone->cl_src_pos,
1272 			dst, clone->cl_dst_pos, clone->cl_count,
1273 			EX_ISSYNC(cstate->current_fh.fh_export));
1274 
1275 	nfsd_file_put(dst);
1276 	nfsd_file_put(src);
1277 out:
1278 	return status;
1279 }
1280 
nfs4_put_copy(struct nfsd4_copy * copy)1281 static void nfs4_put_copy(struct nfsd4_copy *copy)
1282 {
1283 	if (!refcount_dec_and_test(&copy->refcount))
1284 		return;
1285 	kfree(copy->cp_src);
1286 	kfree(copy);
1287 }
1288 
nfsd4_stop_copy(struct nfsd4_copy * copy)1289 static void nfsd4_stop_copy(struct nfsd4_copy *copy)
1290 {
1291 	if (!test_and_set_bit(NFSD4_COPY_F_STOPPED, &copy->cp_flags))
1292 		kthread_stop(copy->copy_task);
1293 	nfs4_put_copy(copy);
1294 }
1295 
nfsd4_get_copy(struct nfs4_client * clp)1296 static struct nfsd4_copy *nfsd4_get_copy(struct nfs4_client *clp)
1297 {
1298 	struct nfsd4_copy *copy = NULL;
1299 
1300 	spin_lock(&clp->async_lock);
1301 	if (!list_empty(&clp->async_copies)) {
1302 		copy = list_first_entry(&clp->async_copies, struct nfsd4_copy,
1303 					copies);
1304 		refcount_inc(&copy->refcount);
1305 	}
1306 	spin_unlock(&clp->async_lock);
1307 	return copy;
1308 }
1309 
nfsd4_shutdown_copy(struct nfs4_client * clp)1310 void nfsd4_shutdown_copy(struct nfs4_client *clp)
1311 {
1312 	struct nfsd4_copy *copy;
1313 
1314 	while ((copy = nfsd4_get_copy(clp)) != NULL)
1315 		nfsd4_stop_copy(copy);
1316 }
1317 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
1318 
1319 extern struct file *nfs42_ssc_open(struct vfsmount *ss_mnt,
1320 				   struct nfs_fh *src_fh,
1321 				   nfs4_stateid *stateid);
1322 extern void nfs42_ssc_close(struct file *filep);
1323 
1324 extern void nfs_sb_deactive(struct super_block *sb);
1325 
1326 #define NFSD42_INTERSSC_MOUNTOPS "vers=4.2,addr=%s,sec=sys"
1327 
1328 /*
1329  * setup a work entry in the ssc delayed unmount list.
1330  */
nfsd4_ssc_setup_dul(struct nfsd_net * nn,char * ipaddr,struct nfsd4_ssc_umount_item ** nsui)1331 static __be32 nfsd4_ssc_setup_dul(struct nfsd_net *nn, char *ipaddr,
1332 				  struct nfsd4_ssc_umount_item **nsui)
1333 {
1334 	struct nfsd4_ssc_umount_item *ni = NULL;
1335 	struct nfsd4_ssc_umount_item *work = NULL;
1336 	struct nfsd4_ssc_umount_item *tmp;
1337 	DEFINE_WAIT(wait);
1338 	__be32 status = 0;
1339 
1340 	*nsui = NULL;
1341 	work = kzalloc(sizeof(*work), GFP_KERNEL);
1342 try_again:
1343 	spin_lock(&nn->nfsd_ssc_lock);
1344 	list_for_each_entry_safe(ni, tmp, &nn->nfsd_ssc_mount_list, nsui_list) {
1345 		if (strncmp(ni->nsui_ipaddr, ipaddr, sizeof(ni->nsui_ipaddr)))
1346 			continue;
1347 		/* found a match */
1348 		if (ni->nsui_busy) {
1349 			/*  wait - and try again */
1350 			prepare_to_wait(&nn->nfsd_ssc_waitq, &wait, TASK_IDLE);
1351 			spin_unlock(&nn->nfsd_ssc_lock);
1352 
1353 			/* allow 20secs for mount/unmount for now - revisit */
1354 			if (kthread_should_stop() ||
1355 					(schedule_timeout(20*HZ) == 0)) {
1356 				finish_wait(&nn->nfsd_ssc_waitq, &wait);
1357 				kfree(work);
1358 				return nfserr_eagain;
1359 			}
1360 			finish_wait(&nn->nfsd_ssc_waitq, &wait);
1361 			goto try_again;
1362 		}
1363 		*nsui = ni;
1364 		refcount_inc(&ni->nsui_refcnt);
1365 		spin_unlock(&nn->nfsd_ssc_lock);
1366 		kfree(work);
1367 
1368 		/* return vfsmount in (*nsui)->nsui_vfsmount */
1369 		return 0;
1370 	}
1371 	if (work) {
1372 		strscpy(work->nsui_ipaddr, ipaddr, sizeof(work->nsui_ipaddr) - 1);
1373 		refcount_set(&work->nsui_refcnt, 2);
1374 		work->nsui_busy = true;
1375 		list_add_tail(&work->nsui_list, &nn->nfsd_ssc_mount_list);
1376 		*nsui = work;
1377 	} else
1378 		status = nfserr_resource;
1379 	spin_unlock(&nn->nfsd_ssc_lock);
1380 	return status;
1381 }
1382 
nfsd4_ssc_update_dul(struct nfsd_net * nn,struct nfsd4_ssc_umount_item * nsui,struct vfsmount * ss_mnt)1383 static void nfsd4_ssc_update_dul(struct nfsd_net *nn,
1384 				 struct nfsd4_ssc_umount_item *nsui,
1385 				 struct vfsmount *ss_mnt)
1386 {
1387 	spin_lock(&nn->nfsd_ssc_lock);
1388 	nsui->nsui_vfsmount = ss_mnt;
1389 	nsui->nsui_busy = false;
1390 	wake_up_all(&nn->nfsd_ssc_waitq);
1391 	spin_unlock(&nn->nfsd_ssc_lock);
1392 }
1393 
nfsd4_ssc_cancel_dul(struct nfsd_net * nn,struct nfsd4_ssc_umount_item * nsui)1394 static void nfsd4_ssc_cancel_dul(struct nfsd_net *nn,
1395 				 struct nfsd4_ssc_umount_item *nsui)
1396 {
1397 	spin_lock(&nn->nfsd_ssc_lock);
1398 	list_del(&nsui->nsui_list);
1399 	wake_up_all(&nn->nfsd_ssc_waitq);
1400 	spin_unlock(&nn->nfsd_ssc_lock);
1401 	kfree(nsui);
1402 }
1403 
1404 /*
1405  * Support one copy source server for now.
1406  */
1407 static __be32
nfsd4_interssc_connect(struct nl4_server * nss,struct svc_rqst * rqstp,struct nfsd4_ssc_umount_item ** nsui)1408 nfsd4_interssc_connect(struct nl4_server *nss, struct svc_rqst *rqstp,
1409 		       struct nfsd4_ssc_umount_item **nsui)
1410 {
1411 	struct file_system_type *type;
1412 	struct vfsmount *ss_mnt;
1413 	struct nfs42_netaddr *naddr;
1414 	struct sockaddr_storage tmp_addr;
1415 	size_t tmp_addrlen, match_netid_len = 3;
1416 	char *startsep = "", *endsep = "", *match_netid = "tcp";
1417 	char *ipaddr, *dev_name, *raw_data;
1418 	int len, raw_len;
1419 	__be32 status = nfserr_inval;
1420 	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1421 
1422 	naddr = &nss->u.nl4_addr;
1423 	tmp_addrlen = rpc_uaddr2sockaddr(SVC_NET(rqstp), naddr->addr,
1424 					 naddr->addr_len,
1425 					 (struct sockaddr *)&tmp_addr,
1426 					 sizeof(tmp_addr));
1427 	*nsui = NULL;
1428 	if (tmp_addrlen == 0)
1429 		goto out_err;
1430 
1431 	if (tmp_addr.ss_family == AF_INET6) {
1432 		startsep = "[";
1433 		endsep = "]";
1434 		match_netid = "tcp6";
1435 		match_netid_len = 4;
1436 	}
1437 
1438 	if (naddr->netid_len != match_netid_len ||
1439 		strncmp(naddr->netid, match_netid, naddr->netid_len))
1440 		goto out_err;
1441 
1442 	/* Construct the raw data for the vfs_kern_mount call */
1443 	len = RPC_MAX_ADDRBUFLEN + 1;
1444 	ipaddr = kzalloc(len, GFP_KERNEL);
1445 	if (!ipaddr)
1446 		goto out_err;
1447 
1448 	rpc_ntop((struct sockaddr *)&tmp_addr, ipaddr, len);
1449 
1450 	/* 2 for ipv6 endsep and startsep. 3 for ":/" and trailing '/0'*/
1451 
1452 	raw_len = strlen(NFSD42_INTERSSC_MOUNTOPS) + strlen(ipaddr);
1453 	raw_data = kzalloc(raw_len, GFP_KERNEL);
1454 	if (!raw_data)
1455 		goto out_free_ipaddr;
1456 
1457 	snprintf(raw_data, raw_len, NFSD42_INTERSSC_MOUNTOPS, ipaddr);
1458 
1459 	status = nfserr_nodev;
1460 	type = get_fs_type("nfs");
1461 	if (!type)
1462 		goto out_free_rawdata;
1463 
1464 	/* Set the server:<export> for the vfs_kern_mount call */
1465 	dev_name = kzalloc(len + 5, GFP_KERNEL);
1466 	if (!dev_name)
1467 		goto out_free_rawdata;
1468 	snprintf(dev_name, len + 5, "%s%s%s:/", startsep, ipaddr, endsep);
1469 
1470 	status = nfsd4_ssc_setup_dul(nn, ipaddr, nsui);
1471 	if (status)
1472 		goto out_free_devname;
1473 	if ((*nsui)->nsui_vfsmount)
1474 		goto out_done;
1475 
1476 	/* Use an 'internal' mount: SB_KERNMOUNT -> MNT_INTERNAL */
1477 	ss_mnt = vfs_kern_mount(type, SB_KERNMOUNT, dev_name, raw_data);
1478 	module_put(type->owner);
1479 	if (IS_ERR(ss_mnt)) {
1480 		status = nfserr_nodev;
1481 		nfsd4_ssc_cancel_dul(nn, *nsui);
1482 		goto out_free_devname;
1483 	}
1484 	nfsd4_ssc_update_dul(nn, *nsui, ss_mnt);
1485 out_done:
1486 	status = 0;
1487 
1488 out_free_devname:
1489 	kfree(dev_name);
1490 out_free_rawdata:
1491 	kfree(raw_data);
1492 out_free_ipaddr:
1493 	kfree(ipaddr);
1494 out_err:
1495 	return status;
1496 }
1497 
1498 /*
1499  * Verify COPY destination stateid.
1500  *
1501  * Connect to the source server with NFSv4.1.
1502  * Create the source struct file for nfsd_copy_range.
1503  * Called with COPY cstate:
1504  *    SAVED_FH: source filehandle
1505  *    CURRENT_FH: destination filehandle
1506  */
1507 static __be32
nfsd4_setup_inter_ssc(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,struct nfsd4_copy * copy)1508 nfsd4_setup_inter_ssc(struct svc_rqst *rqstp,
1509 		      struct nfsd4_compound_state *cstate,
1510 		      struct nfsd4_copy *copy)
1511 {
1512 	struct svc_fh *s_fh = NULL;
1513 	stateid_t *s_stid = &copy->cp_src_stateid;
1514 	__be32 status = nfserr_inval;
1515 
1516 	/* Verify the destination stateid and set dst struct file*/
1517 	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1518 					    &copy->cp_dst_stateid,
1519 					    WR_STATE, &copy->nf_dst, NULL);
1520 	if (status)
1521 		goto out;
1522 
1523 	status = nfsd4_interssc_connect(copy->cp_src, rqstp, &copy->ss_nsui);
1524 	if (status)
1525 		goto out;
1526 
1527 	s_fh = &cstate->save_fh;
1528 
1529 	copy->c_fh.size = s_fh->fh_handle.fh_size;
1530 	memcpy(copy->c_fh.data, &s_fh->fh_handle.fh_raw, copy->c_fh.size);
1531 	copy->stateid.seqid = cpu_to_be32(s_stid->si_generation);
1532 	memcpy(copy->stateid.other, (void *)&s_stid->si_opaque,
1533 	       sizeof(stateid_opaque_t));
1534 
1535 	status = 0;
1536 out:
1537 	return status;
1538 }
1539 
1540 static void
nfsd4_cleanup_inter_ssc(struct nfsd4_ssc_umount_item * nsui,struct file * filp,struct nfsd_file * dst)1541 nfsd4_cleanup_inter_ssc(struct nfsd4_ssc_umount_item *nsui, struct file *filp,
1542 			struct nfsd_file *dst)
1543 {
1544 	struct nfsd_net *nn = net_generic(dst->nf_net, nfsd_net_id);
1545 	long timeout = msecs_to_jiffies(nfsd4_ssc_umount_timeout);
1546 
1547 	nfs42_ssc_close(filp);
1548 	fput(filp);
1549 
1550 	spin_lock(&nn->nfsd_ssc_lock);
1551 	list_del(&nsui->nsui_list);
1552 	/*
1553 	 * vfsmount can be shared by multiple exports,
1554 	 * decrement refcnt. If the count drops to 1 it
1555 	 * will be unmounted when nsui_expire expires.
1556 	 */
1557 	refcount_dec(&nsui->nsui_refcnt);
1558 	nsui->nsui_expire = jiffies + timeout;
1559 	list_add_tail(&nsui->nsui_list, &nn->nfsd_ssc_mount_list);
1560 	spin_unlock(&nn->nfsd_ssc_lock);
1561 }
1562 
1563 #else /* CONFIG_NFSD_V4_2_INTER_SSC */
1564 
1565 static __be32
nfsd4_setup_inter_ssc(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,struct nfsd4_copy * copy)1566 nfsd4_setup_inter_ssc(struct svc_rqst *rqstp,
1567 		      struct nfsd4_compound_state *cstate,
1568 		      struct nfsd4_copy *copy)
1569 {
1570 	return nfserr_inval;
1571 }
1572 
1573 static void
nfsd4_cleanup_inter_ssc(struct nfsd4_ssc_umount_item * nsui,struct file * filp,struct nfsd_file * dst)1574 nfsd4_cleanup_inter_ssc(struct nfsd4_ssc_umount_item *nsui, struct file *filp,
1575 			struct nfsd_file *dst)
1576 {
1577 }
1578 
nfs42_ssc_open(struct vfsmount * ss_mnt,struct nfs_fh * src_fh,nfs4_stateid * stateid)1579 static struct file *nfs42_ssc_open(struct vfsmount *ss_mnt,
1580 				   struct nfs_fh *src_fh,
1581 				   nfs4_stateid *stateid)
1582 {
1583 	return NULL;
1584 }
1585 #endif /* CONFIG_NFSD_V4_2_INTER_SSC */
1586 
1587 static __be32
nfsd4_setup_intra_ssc(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,struct nfsd4_copy * copy)1588 nfsd4_setup_intra_ssc(struct svc_rqst *rqstp,
1589 		      struct nfsd4_compound_state *cstate,
1590 		      struct nfsd4_copy *copy)
1591 {
1592 	return nfsd4_verify_copy(rqstp, cstate, &copy->cp_src_stateid,
1593 				 &copy->nf_src, &copy->cp_dst_stateid,
1594 				 &copy->nf_dst);
1595 }
1596 
nfsd4_cb_offload_release(struct nfsd4_callback * cb)1597 static void nfsd4_cb_offload_release(struct nfsd4_callback *cb)
1598 {
1599 	struct nfsd4_cb_offload *cbo =
1600 		container_of(cb, struct nfsd4_cb_offload, co_cb);
1601 
1602 	kfree(cbo);
1603 }
1604 
nfsd4_cb_offload_done(struct nfsd4_callback * cb,struct rpc_task * task)1605 static int nfsd4_cb_offload_done(struct nfsd4_callback *cb,
1606 				 struct rpc_task *task)
1607 {
1608 	struct nfsd4_cb_offload *cbo =
1609 		container_of(cb, struct nfsd4_cb_offload, co_cb);
1610 
1611 	trace_nfsd_cb_offload_done(&cbo->co_res.cb_stateid, task);
1612 	return 1;
1613 }
1614 
1615 static const struct nfsd4_callback_ops nfsd4_cb_offload_ops = {
1616 	.release = nfsd4_cb_offload_release,
1617 	.done = nfsd4_cb_offload_done
1618 };
1619 
nfsd4_init_copy_res(struct nfsd4_copy * copy,bool sync)1620 static void nfsd4_init_copy_res(struct nfsd4_copy *copy, bool sync)
1621 {
1622 	copy->cp_res.wr_stable_how =
1623 		test_bit(NFSD4_COPY_F_COMMITTED, &copy->cp_flags) ?
1624 			NFS_FILE_SYNC : NFS_UNSTABLE;
1625 	nfsd4_copy_set_sync(copy, sync);
1626 	gen_boot_verifier(&copy->cp_res.wr_verifier, copy->cp_clp->net);
1627 }
1628 
_nfsd_copy_file_range(struct nfsd4_copy * copy,struct file * dst,struct file * src)1629 static ssize_t _nfsd_copy_file_range(struct nfsd4_copy *copy,
1630 				     struct file *dst,
1631 				     struct file *src)
1632 {
1633 	errseq_t since;
1634 	ssize_t bytes_copied = 0;
1635 	u64 bytes_total = copy->cp_count;
1636 	u64 src_pos = copy->cp_src_pos;
1637 	u64 dst_pos = copy->cp_dst_pos;
1638 	int status;
1639 	loff_t end;
1640 
1641 	/* See RFC 7862 p.67: */
1642 	if (bytes_total == 0)
1643 		bytes_total = ULLONG_MAX;
1644 	do {
1645 		if (kthread_should_stop())
1646 			break;
1647 		bytes_copied = nfsd_copy_file_range(src, src_pos, dst, dst_pos,
1648 						    bytes_total);
1649 		if (bytes_copied <= 0)
1650 			break;
1651 		bytes_total -= bytes_copied;
1652 		copy->cp_res.wr_bytes_written += bytes_copied;
1653 		src_pos += bytes_copied;
1654 		dst_pos += bytes_copied;
1655 	} while (bytes_total > 0 && nfsd4_copy_is_async(copy));
1656 	/* for a non-zero asynchronous copy do a commit of data */
1657 	if (nfsd4_copy_is_async(copy) && copy->cp_res.wr_bytes_written > 0) {
1658 		since = READ_ONCE(dst->f_wb_err);
1659 		end = copy->cp_dst_pos + copy->cp_res.wr_bytes_written - 1;
1660 		status = vfs_fsync_range(dst, copy->cp_dst_pos, end, 0);
1661 		if (!status)
1662 			status = filemap_check_wb_err(dst->f_mapping, since);
1663 		if (!status)
1664 			set_bit(NFSD4_COPY_F_COMMITTED, &copy->cp_flags);
1665 	}
1666 	return bytes_copied;
1667 }
1668 
nfsd4_do_copy(struct nfsd4_copy * copy,struct file * src,struct file * dst,bool sync)1669 static __be32 nfsd4_do_copy(struct nfsd4_copy *copy,
1670 			    struct file *src, struct file *dst,
1671 			    bool sync)
1672 {
1673 	__be32 status;
1674 	ssize_t bytes;
1675 
1676 	bytes = _nfsd_copy_file_range(copy, dst, src);
1677 
1678 	/* for async copy, we ignore the error, client can always retry
1679 	 * to get the error
1680 	 */
1681 	if (bytes < 0 && !copy->cp_res.wr_bytes_written)
1682 		status = nfserrno(bytes);
1683 	else {
1684 		nfsd4_init_copy_res(copy, sync);
1685 		status = nfs_ok;
1686 	}
1687 	return status;
1688 }
1689 
dup_copy_fields(struct nfsd4_copy * src,struct nfsd4_copy * dst)1690 static void dup_copy_fields(struct nfsd4_copy *src, struct nfsd4_copy *dst)
1691 {
1692 	dst->cp_src_pos = src->cp_src_pos;
1693 	dst->cp_dst_pos = src->cp_dst_pos;
1694 	dst->cp_count = src->cp_count;
1695 	dst->cp_flags = src->cp_flags;
1696 	memcpy(&dst->cp_res, &src->cp_res, sizeof(src->cp_res));
1697 	memcpy(&dst->fh, &src->fh, sizeof(src->fh));
1698 	dst->cp_clp = src->cp_clp;
1699 	dst->nf_dst = nfsd_file_get(src->nf_dst);
1700 	/* for inter, nf_src doesn't exist yet */
1701 	if (!nfsd4_ssc_is_inter(src))
1702 		dst->nf_src = nfsd_file_get(src->nf_src);
1703 
1704 	memcpy(&dst->cp_stateid, &src->cp_stateid, sizeof(src->cp_stateid));
1705 	memcpy(dst->cp_src, src->cp_src, sizeof(struct nl4_server));
1706 	memcpy(&dst->stateid, &src->stateid, sizeof(src->stateid));
1707 	memcpy(&dst->c_fh, &src->c_fh, sizeof(src->c_fh));
1708 	dst->ss_nsui = src->ss_nsui;
1709 }
1710 
release_copy_files(struct nfsd4_copy * copy)1711 static void release_copy_files(struct nfsd4_copy *copy)
1712 {
1713 	if (copy->nf_src)
1714 		nfsd_file_put(copy->nf_src);
1715 	if (copy->nf_dst)
1716 		nfsd_file_put(copy->nf_dst);
1717 }
1718 
cleanup_async_copy(struct nfsd4_copy * copy)1719 static void cleanup_async_copy(struct nfsd4_copy *copy)
1720 {
1721 	nfs4_free_copy_state(copy);
1722 	release_copy_files(copy);
1723 	if (copy->cp_clp) {
1724 		spin_lock(&copy->cp_clp->async_lock);
1725 		if (!list_empty(&copy->copies))
1726 			list_del_init(&copy->copies);
1727 		spin_unlock(&copy->cp_clp->async_lock);
1728 	}
1729 	nfs4_put_copy(copy);
1730 }
1731 
nfsd4_send_cb_offload(struct nfsd4_copy * copy,__be32 nfserr)1732 static void nfsd4_send_cb_offload(struct nfsd4_copy *copy, __be32 nfserr)
1733 {
1734 	struct nfsd4_cb_offload *cbo;
1735 
1736 	cbo = kzalloc(sizeof(*cbo), GFP_KERNEL);
1737 	if (!cbo)
1738 		return;
1739 
1740 	memcpy(&cbo->co_res, &copy->cp_res, sizeof(copy->cp_res));
1741 	memcpy(&cbo->co_fh, &copy->fh, sizeof(copy->fh));
1742 	cbo->co_nfserr = nfserr;
1743 
1744 	nfsd4_init_cb(&cbo->co_cb, copy->cp_clp, &nfsd4_cb_offload_ops,
1745 		      NFSPROC4_CLNT_CB_OFFLOAD);
1746 	trace_nfsd_cb_offload(copy->cp_clp, &cbo->co_res.cb_stateid,
1747 			      &cbo->co_fh, copy->cp_count, nfserr);
1748 	nfsd4_run_cb(&cbo->co_cb);
1749 }
1750 
1751 /**
1752  * nfsd4_do_async_copy - kthread function for background server-side COPY
1753  * @data: arguments for COPY operation
1754  *
1755  * Return values:
1756  *   %0: Copy operation is done.
1757  */
nfsd4_do_async_copy(void * data)1758 static int nfsd4_do_async_copy(void *data)
1759 {
1760 	struct nfsd4_copy *copy = (struct nfsd4_copy *)data;
1761 	__be32 nfserr;
1762 
1763 	if (nfsd4_ssc_is_inter(copy)) {
1764 		struct file *filp;
1765 
1766 		filp = nfs42_ssc_open(copy->ss_nsui->nsui_vfsmount,
1767 				      &copy->c_fh, &copy->stateid);
1768 		if (IS_ERR(filp)) {
1769 			switch (PTR_ERR(filp)) {
1770 			case -EBADF:
1771 				nfserr = nfserr_wrong_type;
1772 				break;
1773 			default:
1774 				nfserr = nfserr_offload_denied;
1775 			}
1776 			/* ss_mnt will be unmounted by the laundromat */
1777 			goto do_callback;
1778 		}
1779 		nfserr = nfsd4_do_copy(copy, filp, copy->nf_dst->nf_file,
1780 				       false);
1781 		nfsd4_cleanup_inter_ssc(copy->ss_nsui, filp, copy->nf_dst);
1782 	} else {
1783 		nfserr = nfsd4_do_copy(copy, copy->nf_src->nf_file,
1784 				       copy->nf_dst->nf_file, false);
1785 	}
1786 
1787 do_callback:
1788 	nfsd4_send_cb_offload(copy, nfserr);
1789 	cleanup_async_copy(copy);
1790 	return 0;
1791 }
1792 
1793 static __be32
nfsd4_copy(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)1794 nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1795 		union nfsd4_op_u *u)
1796 {
1797 	struct nfsd4_copy *copy = &u->copy;
1798 	__be32 status;
1799 	struct nfsd4_copy *async_copy = NULL;
1800 
1801 	if (nfsd4_ssc_is_inter(copy)) {
1802 		if (!inter_copy_offload_enable || nfsd4_copy_is_sync(copy)) {
1803 			status = nfserr_notsupp;
1804 			goto out;
1805 		}
1806 		status = nfsd4_setup_inter_ssc(rqstp, cstate, copy);
1807 		if (status)
1808 			return nfserr_offload_denied;
1809 	} else {
1810 		status = nfsd4_setup_intra_ssc(rqstp, cstate, copy);
1811 		if (status)
1812 			return status;
1813 	}
1814 
1815 	copy->cp_clp = cstate->clp;
1816 	memcpy(&copy->fh, &cstate->current_fh.fh_handle,
1817 		sizeof(struct knfsd_fh));
1818 	if (nfsd4_copy_is_async(copy)) {
1819 		struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1820 
1821 		status = nfserrno(-ENOMEM);
1822 		async_copy = kzalloc(sizeof(struct nfsd4_copy), GFP_KERNEL);
1823 		if (!async_copy)
1824 			goto out_err;
1825 		INIT_LIST_HEAD(&async_copy->copies);
1826 		refcount_set(&async_copy->refcount, 1);
1827 		async_copy->cp_src = kmalloc(sizeof(*async_copy->cp_src), GFP_KERNEL);
1828 		if (!async_copy->cp_src)
1829 			goto out_err;
1830 		if (!nfs4_init_copy_state(nn, copy))
1831 			goto out_err;
1832 		memcpy(&copy->cp_res.cb_stateid, &copy->cp_stateid.cs_stid,
1833 			sizeof(copy->cp_res.cb_stateid));
1834 		dup_copy_fields(copy, async_copy);
1835 		async_copy->copy_task = kthread_create(nfsd4_do_async_copy,
1836 				async_copy, "%s", "copy thread");
1837 		if (IS_ERR(async_copy->copy_task))
1838 			goto out_err;
1839 		spin_lock(&async_copy->cp_clp->async_lock);
1840 		list_add(&async_copy->copies,
1841 				&async_copy->cp_clp->async_copies);
1842 		spin_unlock(&async_copy->cp_clp->async_lock);
1843 		wake_up_process(async_copy->copy_task);
1844 		status = nfs_ok;
1845 	} else {
1846 		status = nfsd4_do_copy(copy, copy->nf_src->nf_file,
1847 				       copy->nf_dst->nf_file, true);
1848 	}
1849 out:
1850 	release_copy_files(copy);
1851 	return status;
1852 out_err:
1853 	if (nfsd4_ssc_is_inter(copy)) {
1854 		/*
1855 		 * Source's vfsmount of inter-copy will be unmounted
1856 		 * by the laundromat. Use copy instead of async_copy
1857 		 * since async_copy->ss_nsui might not be set yet.
1858 		 */
1859 		refcount_dec(&copy->ss_nsui->nsui_refcnt);
1860 	}
1861 	if (async_copy)
1862 		cleanup_async_copy(async_copy);
1863 	status = nfserrno(-ENOMEM);
1864 	goto out;
1865 }
1866 
1867 static struct nfsd4_copy *
find_async_copy_locked(struct nfs4_client * clp,stateid_t * stateid)1868 find_async_copy_locked(struct nfs4_client *clp, stateid_t *stateid)
1869 {
1870 	struct nfsd4_copy *copy;
1871 
1872 	lockdep_assert_held(&clp->async_lock);
1873 
1874 	list_for_each_entry(copy, &clp->async_copies, copies) {
1875 		if (memcmp(&copy->cp_stateid.cs_stid, stateid, NFS4_STATEID_SIZE))
1876 			continue;
1877 		return copy;
1878 	}
1879 	return NULL;
1880 }
1881 
1882 static struct nfsd4_copy *
find_async_copy(struct nfs4_client * clp,stateid_t * stateid)1883 find_async_copy(struct nfs4_client *clp, stateid_t *stateid)
1884 {
1885 	struct nfsd4_copy *copy;
1886 
1887 	spin_lock(&clp->async_lock);
1888 	copy = find_async_copy_locked(clp, stateid);
1889 	if (copy)
1890 		refcount_inc(&copy->refcount);
1891 	spin_unlock(&clp->async_lock);
1892 	return copy;
1893 }
1894 
1895 static __be32
nfsd4_offload_cancel(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)1896 nfsd4_offload_cancel(struct svc_rqst *rqstp,
1897 		     struct nfsd4_compound_state *cstate,
1898 		     union nfsd4_op_u *u)
1899 {
1900 	struct nfsd4_offload_status *os = &u->offload_status;
1901 	struct nfsd4_copy *copy;
1902 	struct nfs4_client *clp = cstate->clp;
1903 
1904 	copy = find_async_copy(clp, &os->stateid);
1905 	if (!copy) {
1906 		struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1907 
1908 		return manage_cpntf_state(nn, &os->stateid, clp, NULL);
1909 	} else
1910 		nfsd4_stop_copy(copy);
1911 
1912 	return nfs_ok;
1913 }
1914 
1915 static __be32
nfsd4_copy_notify(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)1916 nfsd4_copy_notify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1917 		  union nfsd4_op_u *u)
1918 {
1919 	struct nfsd4_copy_notify *cn = &u->copy_notify;
1920 	__be32 status;
1921 	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1922 	struct nfs4_stid *stid;
1923 	struct nfs4_cpntf_state *cps;
1924 	struct nfs4_client *clp = cstate->clp;
1925 
1926 	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1927 					&cn->cpn_src_stateid, RD_STATE, NULL,
1928 					&stid);
1929 	if (status)
1930 		return status;
1931 
1932 	cn->cpn_sec = nn->nfsd4_lease;
1933 	cn->cpn_nsec = 0;
1934 
1935 	status = nfserrno(-ENOMEM);
1936 	cps = nfs4_alloc_init_cpntf_state(nn, stid);
1937 	if (!cps)
1938 		goto out;
1939 	memcpy(&cn->cpn_cnr_stateid, &cps->cp_stateid.cs_stid, sizeof(stateid_t));
1940 	memcpy(&cps->cp_p_stateid, &stid->sc_stateid, sizeof(stateid_t));
1941 	memcpy(&cps->cp_p_clid, &clp->cl_clientid, sizeof(clientid_t));
1942 
1943 	/* For now, only return one server address in cpn_src, the
1944 	 * address used by the client to connect to this server.
1945 	 */
1946 	cn->cpn_src->nl4_type = NL4_NETADDR;
1947 	status = nfsd4_set_netaddr((struct sockaddr *)&rqstp->rq_daddr,
1948 				 &cn->cpn_src->u.nl4_addr);
1949 	WARN_ON_ONCE(status);
1950 	if (status) {
1951 		nfs4_put_cpntf_state(nn, cps);
1952 		goto out;
1953 	}
1954 out:
1955 	nfs4_put_stid(stid);
1956 	return status;
1957 }
1958 
1959 static __be32
nfsd4_fallocate(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,struct nfsd4_fallocate * fallocate,int flags)1960 nfsd4_fallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1961 		struct nfsd4_fallocate *fallocate, int flags)
1962 {
1963 	__be32 status;
1964 	struct nfsd_file *nf;
1965 
1966 	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1967 					    &fallocate->falloc_stateid,
1968 					    WR_STATE, &nf, NULL);
1969 	if (status != nfs_ok)
1970 		return status;
1971 
1972 	status = nfsd4_vfs_fallocate(rqstp, &cstate->current_fh, nf->nf_file,
1973 				     fallocate->falloc_offset,
1974 				     fallocate->falloc_length,
1975 				     flags);
1976 	nfsd_file_put(nf);
1977 	return status;
1978 }
1979 
1980 static __be32
nfsd4_offload_status(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)1981 nfsd4_offload_status(struct svc_rqst *rqstp,
1982 		     struct nfsd4_compound_state *cstate,
1983 		     union nfsd4_op_u *u)
1984 {
1985 	struct nfsd4_offload_status *os = &u->offload_status;
1986 	__be32 status = nfs_ok;
1987 	struct nfsd4_copy *copy;
1988 	struct nfs4_client *clp = cstate->clp;
1989 
1990 	spin_lock(&clp->async_lock);
1991 	copy = find_async_copy_locked(clp, &os->stateid);
1992 	if (copy)
1993 		os->count = copy->cp_res.wr_bytes_written;
1994 	else
1995 		status = nfserr_bad_stateid;
1996 	spin_unlock(&clp->async_lock);
1997 
1998 	return status;
1999 }
2000 
2001 static __be32
nfsd4_allocate(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)2002 nfsd4_allocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2003 	       union nfsd4_op_u *u)
2004 {
2005 	return nfsd4_fallocate(rqstp, cstate, &u->allocate, 0);
2006 }
2007 
2008 static __be32
nfsd4_deallocate(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)2009 nfsd4_deallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2010 		 union nfsd4_op_u *u)
2011 {
2012 	return nfsd4_fallocate(rqstp, cstate, &u->deallocate,
2013 			       FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE);
2014 }
2015 
2016 static __be32
nfsd4_seek(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)2017 nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2018 	   union nfsd4_op_u *u)
2019 {
2020 	struct nfsd4_seek *seek = &u->seek;
2021 	int whence;
2022 	__be32 status;
2023 	struct nfsd_file *nf;
2024 
2025 	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
2026 					    &seek->seek_stateid,
2027 					    RD_STATE, &nf, NULL);
2028 	if (status)
2029 		return status;
2030 
2031 	switch (seek->seek_whence) {
2032 	case NFS4_CONTENT_DATA:
2033 		whence = SEEK_DATA;
2034 		break;
2035 	case NFS4_CONTENT_HOLE:
2036 		whence = SEEK_HOLE;
2037 		break;
2038 	default:
2039 		status = nfserr_union_notsupp;
2040 		goto out;
2041 	}
2042 
2043 	/*
2044 	 * Note:  This call does change file->f_pos, but nothing in NFSD
2045 	 *        should ever file->f_pos.
2046 	 */
2047 	seek->seek_pos = vfs_llseek(nf->nf_file, seek->seek_offset, whence);
2048 	if (seek->seek_pos < 0)
2049 		status = nfserrno(seek->seek_pos);
2050 	else if (seek->seek_pos >= i_size_read(file_inode(nf->nf_file)))
2051 		seek->seek_eof = true;
2052 
2053 out:
2054 	nfsd_file_put(nf);
2055 	return status;
2056 }
2057 
2058 /* This routine never returns NFS_OK!  If there are no other errors, it
2059  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
2060  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
2061  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
2062  */
2063 static __be32
_nfsd4_verify(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,struct nfsd4_verify * verify)2064 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2065 	     struct nfsd4_verify *verify)
2066 {
2067 	__be32 *buf, *p;
2068 	int count;
2069 	__be32 status;
2070 
2071 	status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
2072 	if (status)
2073 		return status;
2074 
2075 	status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
2076 	if (status)
2077 		return status;
2078 
2079 	if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
2080 	    || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
2081 		return nfserr_inval;
2082 	if (verify->ve_attrlen & 3)
2083 		return nfserr_inval;
2084 
2085 	/* count in words:
2086 	 *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
2087 	 */
2088 	count = 4 + (verify->ve_attrlen >> 2);
2089 	buf = kmalloc(count << 2, GFP_KERNEL);
2090 	if (!buf)
2091 		return nfserr_jukebox;
2092 
2093 	p = buf;
2094 	status = nfsd4_encode_fattr_to_buf(&p, count, &cstate->current_fh,
2095 				    cstate->current_fh.fh_export,
2096 				    cstate->current_fh.fh_dentry,
2097 				    verify->ve_bmval,
2098 				    rqstp, 0);
2099 	/*
2100 	 * If nfsd4_encode_fattr() ran out of space, assume that's because
2101 	 * the attributes are longer (hence different) than those given:
2102 	 */
2103 	if (status == nfserr_resource)
2104 		status = nfserr_not_same;
2105 	if (status)
2106 		goto out_kfree;
2107 
2108 	/* skip bitmap */
2109 	p = buf + 1 + ntohl(buf[0]);
2110 	status = nfserr_not_same;
2111 	if (ntohl(*p++) != verify->ve_attrlen)
2112 		goto out_kfree;
2113 	if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
2114 		status = nfserr_same;
2115 
2116 out_kfree:
2117 	kfree(buf);
2118 	return status;
2119 }
2120 
2121 static __be32
nfsd4_nverify(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)2122 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2123 	      union nfsd4_op_u *u)
2124 {
2125 	__be32 status;
2126 
2127 	status = _nfsd4_verify(rqstp, cstate, &u->verify);
2128 	return status == nfserr_not_same ? nfs_ok : status;
2129 }
2130 
2131 static __be32
nfsd4_verify(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)2132 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2133 	     union nfsd4_op_u *u)
2134 {
2135 	__be32 status;
2136 
2137 	status = _nfsd4_verify(rqstp, cstate, &u->nverify);
2138 	return status == nfserr_same ? nfs_ok : status;
2139 }
2140 
2141 #ifdef CONFIG_NFSD_PNFS
2142 static const struct nfsd4_layout_ops *
nfsd4_layout_verify(struct svc_export * exp,unsigned int layout_type)2143 nfsd4_layout_verify(struct svc_export *exp, unsigned int layout_type)
2144 {
2145 	if (!exp->ex_layout_types) {
2146 		dprintk("%s: export does not support pNFS\n", __func__);
2147 		return NULL;
2148 	}
2149 
2150 	if (layout_type >= LAYOUT_TYPE_MAX ||
2151 	    !(exp->ex_layout_types & (1 << layout_type))) {
2152 		dprintk("%s: layout type %d not supported\n",
2153 			__func__, layout_type);
2154 		return NULL;
2155 	}
2156 
2157 	return nfsd4_layout_ops[layout_type];
2158 }
2159 
2160 static __be32
nfsd4_getdeviceinfo(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)2161 nfsd4_getdeviceinfo(struct svc_rqst *rqstp,
2162 		struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
2163 {
2164 	struct nfsd4_getdeviceinfo *gdp = &u->getdeviceinfo;
2165 	const struct nfsd4_layout_ops *ops;
2166 	struct nfsd4_deviceid_map *map;
2167 	struct svc_export *exp;
2168 	__be32 nfserr;
2169 
2170 	dprintk("%s: layout_type %u dev_id [0x%llx:0x%x] maxcnt %u\n",
2171 	       __func__,
2172 	       gdp->gd_layout_type,
2173 	       gdp->gd_devid.fsid_idx, gdp->gd_devid.generation,
2174 	       gdp->gd_maxcount);
2175 
2176 	map = nfsd4_find_devid_map(gdp->gd_devid.fsid_idx);
2177 	if (!map) {
2178 		dprintk("%s: couldn't find device ID to export mapping!\n",
2179 			__func__);
2180 		return nfserr_noent;
2181 	}
2182 
2183 	exp = rqst_exp_find(rqstp, map->fsid_type, map->fsid);
2184 	if (IS_ERR(exp)) {
2185 		dprintk("%s: could not find device id\n", __func__);
2186 		return nfserr_noent;
2187 	}
2188 
2189 	nfserr = nfserr_layoutunavailable;
2190 	ops = nfsd4_layout_verify(exp, gdp->gd_layout_type);
2191 	if (!ops)
2192 		goto out;
2193 
2194 	nfserr = nfs_ok;
2195 	if (gdp->gd_maxcount != 0) {
2196 		nfserr = ops->proc_getdeviceinfo(exp->ex_path.mnt->mnt_sb,
2197 				rqstp, cstate->clp, gdp);
2198 	}
2199 
2200 	gdp->gd_notify_types &= ops->notify_types;
2201 out:
2202 	exp_put(exp);
2203 	return nfserr;
2204 }
2205 
2206 static void
nfsd4_getdeviceinfo_release(union nfsd4_op_u * u)2207 nfsd4_getdeviceinfo_release(union nfsd4_op_u *u)
2208 {
2209 	kfree(u->getdeviceinfo.gd_device);
2210 }
2211 
2212 static __be32
nfsd4_layoutget(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)2213 nfsd4_layoutget(struct svc_rqst *rqstp,
2214 		struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
2215 {
2216 	struct nfsd4_layoutget *lgp = &u->layoutget;
2217 	struct svc_fh *current_fh = &cstate->current_fh;
2218 	const struct nfsd4_layout_ops *ops;
2219 	struct nfs4_layout_stateid *ls;
2220 	__be32 nfserr;
2221 	int accmode = NFSD_MAY_READ_IF_EXEC | NFSD_MAY_OWNER_OVERRIDE;
2222 
2223 	switch (lgp->lg_seg.iomode) {
2224 	case IOMODE_READ:
2225 		accmode |= NFSD_MAY_READ;
2226 		break;
2227 	case IOMODE_RW:
2228 		accmode |= NFSD_MAY_READ | NFSD_MAY_WRITE;
2229 		break;
2230 	default:
2231 		dprintk("%s: invalid iomode %d\n",
2232 			__func__, lgp->lg_seg.iomode);
2233 		nfserr = nfserr_badiomode;
2234 		goto out;
2235 	}
2236 
2237 	nfserr = fh_verify(rqstp, current_fh, 0, accmode);
2238 	if (nfserr)
2239 		goto out;
2240 
2241 	nfserr = nfserr_layoutunavailable;
2242 	ops = nfsd4_layout_verify(current_fh->fh_export, lgp->lg_layout_type);
2243 	if (!ops)
2244 		goto out;
2245 
2246 	/*
2247 	 * Verify minlength and range as per RFC5661:
2248 	 *  o  If loga_length is less than loga_minlength,
2249 	 *     the metadata server MUST return NFS4ERR_INVAL.
2250 	 *  o  If the sum of loga_offset and loga_minlength exceeds
2251 	 *     NFS4_UINT64_MAX, and loga_minlength is not
2252 	 *     NFS4_UINT64_MAX, the error NFS4ERR_INVAL MUST result.
2253 	 *  o  If the sum of loga_offset and loga_length exceeds
2254 	 *     NFS4_UINT64_MAX, and loga_length is not NFS4_UINT64_MAX,
2255 	 *     the error NFS4ERR_INVAL MUST result.
2256 	 */
2257 	nfserr = nfserr_inval;
2258 	if (lgp->lg_seg.length < lgp->lg_minlength ||
2259 	    (lgp->lg_minlength != NFS4_MAX_UINT64 &&
2260 	     lgp->lg_minlength > NFS4_MAX_UINT64 - lgp->lg_seg.offset) ||
2261 	    (lgp->lg_seg.length != NFS4_MAX_UINT64 &&
2262 	     lgp->lg_seg.length > NFS4_MAX_UINT64 - lgp->lg_seg.offset))
2263 		goto out;
2264 	if (lgp->lg_seg.length == 0)
2265 		goto out;
2266 
2267 	nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lgp->lg_sid,
2268 						true, lgp->lg_layout_type, &ls);
2269 	if (nfserr) {
2270 		trace_nfsd_layout_get_lookup_fail(&lgp->lg_sid);
2271 		goto out;
2272 	}
2273 
2274 	nfserr = nfserr_recallconflict;
2275 	if (atomic_read(&ls->ls_stid.sc_file->fi_lo_recalls))
2276 		goto out_put_stid;
2277 
2278 	nfserr = ops->proc_layoutget(d_inode(current_fh->fh_dentry),
2279 				     current_fh, lgp);
2280 	if (nfserr)
2281 		goto out_put_stid;
2282 
2283 	nfserr = nfsd4_insert_layout(lgp, ls);
2284 
2285 out_put_stid:
2286 	mutex_unlock(&ls->ls_mutex);
2287 	nfs4_put_stid(&ls->ls_stid);
2288 out:
2289 	return nfserr;
2290 }
2291 
2292 static void
nfsd4_layoutget_release(union nfsd4_op_u * u)2293 nfsd4_layoutget_release(union nfsd4_op_u *u)
2294 {
2295 	kfree(u->layoutget.lg_content);
2296 }
2297 
2298 static __be32
nfsd4_layoutcommit(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)2299 nfsd4_layoutcommit(struct svc_rqst *rqstp,
2300 		struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
2301 {
2302 	struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
2303 	const struct nfsd4_layout_seg *seg = &lcp->lc_seg;
2304 	struct svc_fh *current_fh = &cstate->current_fh;
2305 	const struct nfsd4_layout_ops *ops;
2306 	loff_t new_size = lcp->lc_last_wr + 1;
2307 	struct inode *inode;
2308 	struct nfs4_layout_stateid *ls;
2309 	__be32 nfserr;
2310 
2311 	nfserr = fh_verify(rqstp, current_fh, 0,
2312 			   NFSD_MAY_WRITE | NFSD_MAY_OWNER_OVERRIDE);
2313 	if (nfserr)
2314 		goto out;
2315 
2316 	nfserr = nfserr_layoutunavailable;
2317 	ops = nfsd4_layout_verify(current_fh->fh_export, lcp->lc_layout_type);
2318 	if (!ops)
2319 		goto out;
2320 	inode = d_inode(current_fh->fh_dentry);
2321 
2322 	nfserr = nfserr_inval;
2323 	if (new_size <= seg->offset) {
2324 		dprintk("pnfsd: last write before layout segment\n");
2325 		goto out;
2326 	}
2327 	if (new_size > seg->offset + seg->length) {
2328 		dprintk("pnfsd: last write beyond layout segment\n");
2329 		goto out;
2330 	}
2331 	if (!lcp->lc_newoffset && new_size > i_size_read(inode)) {
2332 		dprintk("pnfsd: layoutcommit beyond EOF\n");
2333 		goto out;
2334 	}
2335 
2336 	nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lcp->lc_sid,
2337 						false, lcp->lc_layout_type,
2338 						&ls);
2339 	if (nfserr) {
2340 		trace_nfsd_layout_commit_lookup_fail(&lcp->lc_sid);
2341 		/* fixup error code as per RFC5661 */
2342 		if (nfserr == nfserr_bad_stateid)
2343 			nfserr = nfserr_badlayout;
2344 		goto out;
2345 	}
2346 
2347 	/* LAYOUTCOMMIT does not require any serialization */
2348 	mutex_unlock(&ls->ls_mutex);
2349 
2350 	if (new_size > i_size_read(inode)) {
2351 		lcp->lc_size_chg = 1;
2352 		lcp->lc_newsize = new_size;
2353 	} else {
2354 		lcp->lc_size_chg = 0;
2355 	}
2356 
2357 	nfserr = ops->proc_layoutcommit(inode, lcp);
2358 	nfs4_put_stid(&ls->ls_stid);
2359 out:
2360 	return nfserr;
2361 }
2362 
2363 static __be32
nfsd4_layoutreturn(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)2364 nfsd4_layoutreturn(struct svc_rqst *rqstp,
2365 		struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
2366 {
2367 	struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
2368 	struct svc_fh *current_fh = &cstate->current_fh;
2369 	__be32 nfserr;
2370 
2371 	nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_NOP);
2372 	if (nfserr)
2373 		goto out;
2374 
2375 	nfserr = nfserr_layoutunavailable;
2376 	if (!nfsd4_layout_verify(current_fh->fh_export, lrp->lr_layout_type))
2377 		goto out;
2378 
2379 	switch (lrp->lr_seg.iomode) {
2380 	case IOMODE_READ:
2381 	case IOMODE_RW:
2382 	case IOMODE_ANY:
2383 		break;
2384 	default:
2385 		dprintk("%s: invalid iomode %d\n", __func__,
2386 			lrp->lr_seg.iomode);
2387 		nfserr = nfserr_inval;
2388 		goto out;
2389 	}
2390 
2391 	switch (lrp->lr_return_type) {
2392 	case RETURN_FILE:
2393 		nfserr = nfsd4_return_file_layouts(rqstp, cstate, lrp);
2394 		break;
2395 	case RETURN_FSID:
2396 	case RETURN_ALL:
2397 		nfserr = nfsd4_return_client_layouts(rqstp, cstate, lrp);
2398 		break;
2399 	default:
2400 		dprintk("%s: invalid return_type %d\n", __func__,
2401 			lrp->lr_return_type);
2402 		nfserr = nfserr_inval;
2403 		break;
2404 	}
2405 out:
2406 	return nfserr;
2407 }
2408 #endif /* CONFIG_NFSD_PNFS */
2409 
2410 static __be32
nfsd4_getxattr(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)2411 nfsd4_getxattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2412 	       union nfsd4_op_u *u)
2413 {
2414 	struct nfsd4_getxattr *getxattr = &u->getxattr;
2415 
2416 	return nfsd_getxattr(rqstp, &cstate->current_fh,
2417 			     getxattr->getxa_name, &getxattr->getxa_buf,
2418 			     &getxattr->getxa_len);
2419 }
2420 
2421 static __be32
nfsd4_setxattr(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)2422 nfsd4_setxattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2423 	   union nfsd4_op_u *u)
2424 {
2425 	struct nfsd4_setxattr *setxattr = &u->setxattr;
2426 	__be32 ret;
2427 
2428 	if (opens_in_grace(SVC_NET(rqstp)))
2429 		return nfserr_grace;
2430 
2431 	ret = nfsd_setxattr(rqstp, &cstate->current_fh, setxattr->setxa_name,
2432 			    setxattr->setxa_buf, setxattr->setxa_len,
2433 			    setxattr->setxa_flags);
2434 
2435 	if (!ret)
2436 		set_change_info(&setxattr->setxa_cinfo, &cstate->current_fh);
2437 
2438 	return ret;
2439 }
2440 
2441 static __be32
nfsd4_listxattrs(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)2442 nfsd4_listxattrs(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2443 	   union nfsd4_op_u *u)
2444 {
2445 	/*
2446 	 * Get the entire list, then copy out only the user attributes
2447 	 * in the encode function.
2448 	 */
2449 	return nfsd_listxattr(rqstp, &cstate->current_fh,
2450 			     &u->listxattrs.lsxa_buf, &u->listxattrs.lsxa_len);
2451 }
2452 
2453 static __be32
nfsd4_removexattr(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)2454 nfsd4_removexattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2455 	   union nfsd4_op_u *u)
2456 {
2457 	struct nfsd4_removexattr *removexattr = &u->removexattr;
2458 	__be32 ret;
2459 
2460 	if (opens_in_grace(SVC_NET(rqstp)))
2461 		return nfserr_grace;
2462 
2463 	ret = nfsd_removexattr(rqstp, &cstate->current_fh,
2464 	    removexattr->rmxa_name);
2465 
2466 	if (!ret)
2467 		set_change_info(&removexattr->rmxa_cinfo, &cstate->current_fh);
2468 
2469 	return ret;
2470 }
2471 
2472 /*
2473  * NULL call.
2474  */
2475 static __be32
nfsd4_proc_null(struct svc_rqst * rqstp)2476 nfsd4_proc_null(struct svc_rqst *rqstp)
2477 {
2478 	return rpc_success;
2479 }
2480 
nfsd4_increment_op_stats(struct nfsd_net * nn,u32 opnum)2481 static inline void nfsd4_increment_op_stats(struct nfsd_net *nn, u32 opnum)
2482 {
2483 	if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
2484 		percpu_counter_inc(&nn->counter[NFSD_STATS_NFS4_OP(opnum)]);
2485 }
2486 
2487 static const struct nfsd4_operation nfsd4_ops[];
2488 
2489 static const char *nfsd4_op_name(unsigned opnum);
2490 
2491 /*
2492  * Enforce NFSv4.1 COMPOUND ordering rules:
2493  *
2494  * Also note, enforced elsewhere:
2495  *	- SEQUENCE other than as first op results in
2496  *	  NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
2497  *	- BIND_CONN_TO_SESSION must be the only op in its compound.
2498  *	  (Enforced in nfsd4_bind_conn_to_session().)
2499  *	- DESTROY_SESSION must be the final operation in a compound, if
2500  *	  sessionid's in SEQUENCE and DESTROY_SESSION are the same.
2501  *	  (Enforced in nfsd4_destroy_session().)
2502  */
nfs41_check_op_ordering(struct nfsd4_compoundargs * args)2503 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
2504 {
2505 	struct nfsd4_op *first_op = &args->ops[0];
2506 
2507 	/* These ordering requirements don't apply to NFSv4.0: */
2508 	if (args->minorversion == 0)
2509 		return nfs_ok;
2510 	/* This is weird, but OK, not our problem: */
2511 	if (args->opcnt == 0)
2512 		return nfs_ok;
2513 	if (first_op->status == nfserr_op_illegal)
2514 		return nfs_ok;
2515 	if (!(nfsd4_ops[first_op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
2516 		return nfserr_op_not_in_session;
2517 	if (first_op->opnum == OP_SEQUENCE)
2518 		return nfs_ok;
2519 	/*
2520 	 * So first_op is something allowed outside a session, like
2521 	 * EXCHANGE_ID; but then it has to be the only op in the
2522 	 * compound:
2523 	 */
2524 	if (args->opcnt != 1)
2525 		return nfserr_not_only_op;
2526 	return nfs_ok;
2527 }
2528 
OPDESC(struct nfsd4_op * op)2529 const struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
2530 {
2531 	return &nfsd4_ops[op->opnum];
2532 }
2533 
nfsd4_cache_this_op(struct nfsd4_op * op)2534 bool nfsd4_cache_this_op(struct nfsd4_op *op)
2535 {
2536 	if (op->opnum == OP_ILLEGAL)
2537 		return false;
2538 	return OPDESC(op)->op_flags & OP_CACHEME;
2539 }
2540 
need_wrongsec_check(struct svc_rqst * rqstp)2541 static bool need_wrongsec_check(struct svc_rqst *rqstp)
2542 {
2543 	struct nfsd4_compoundres *resp = rqstp->rq_resp;
2544 	struct nfsd4_compoundargs *argp = rqstp->rq_argp;
2545 	struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
2546 	struct nfsd4_op *next = &argp->ops[resp->opcnt];
2547 	const struct nfsd4_operation *thisd = OPDESC(this);
2548 	const struct nfsd4_operation *nextd;
2549 
2550 	/*
2551 	 * Most ops check wronsec on our own; only the putfh-like ops
2552 	 * have special rules.
2553 	 */
2554 	if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
2555 		return false;
2556 	/*
2557 	 * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
2558 	 * put-filehandle operation if we're not going to use the
2559 	 * result:
2560 	 */
2561 	if (argp->opcnt == resp->opcnt)
2562 		return false;
2563 	if (next->opnum == OP_ILLEGAL)
2564 		return false;
2565 	nextd = OPDESC(next);
2566 	/*
2567 	 * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
2568 	 * errors themselves as necessary; others should check for them
2569 	 * now:
2570 	 */
2571 	return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
2572 }
2573 
2574 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
2575 static void
check_if_stalefh_allowed(struct nfsd4_compoundargs * args)2576 check_if_stalefh_allowed(struct nfsd4_compoundargs *args)
2577 {
2578 	struct nfsd4_op	*op, *current_op = NULL, *saved_op = NULL;
2579 	struct nfsd4_copy *copy;
2580 	struct nfsd4_putfh *putfh;
2581 	int i;
2582 
2583 	/* traverse all operation and if it's a COPY compound, mark the
2584 	 * source filehandle to skip verification
2585 	 */
2586 	for (i = 0; i < args->opcnt; i++) {
2587 		op = &args->ops[i];
2588 		if (op->opnum == OP_PUTFH)
2589 			current_op = op;
2590 		else if (op->opnum == OP_SAVEFH)
2591 			saved_op = current_op;
2592 		else if (op->opnum == OP_RESTOREFH)
2593 			current_op = saved_op;
2594 		else if (op->opnum == OP_COPY) {
2595 			copy = (struct nfsd4_copy *)&op->u;
2596 			if (!saved_op) {
2597 				op->status = nfserr_nofilehandle;
2598 				return;
2599 			}
2600 			putfh = (struct nfsd4_putfh *)&saved_op->u;
2601 			if (nfsd4_ssc_is_inter(copy))
2602 				putfh->no_verify = true;
2603 		}
2604 	}
2605 }
2606 #else
2607 static void
check_if_stalefh_allowed(struct nfsd4_compoundargs * args)2608 check_if_stalefh_allowed(struct nfsd4_compoundargs *args)
2609 {
2610 }
2611 #endif
2612 
2613 /*
2614  * COMPOUND call.
2615  */
2616 static __be32
nfsd4_proc_compound(struct svc_rqst * rqstp)2617 nfsd4_proc_compound(struct svc_rqst *rqstp)
2618 {
2619 	struct nfsd4_compoundargs *args = rqstp->rq_argp;
2620 	struct nfsd4_compoundres *resp = rqstp->rq_resp;
2621 	struct nfsd4_op	*op;
2622 	struct nfsd4_compound_state *cstate = &resp->cstate;
2623 	struct svc_fh *current_fh = &cstate->current_fh;
2624 	struct svc_fh *save_fh = &cstate->save_fh;
2625 	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2626 	__be32		status;
2627 
2628 	resp->xdr = &rqstp->rq_res_stream;
2629 	resp->statusp = resp->xdr->p;
2630 
2631 	/* reserve space for: NFS status code */
2632 	xdr_reserve_space(resp->xdr, XDR_UNIT);
2633 
2634 	/* reserve space for: taglen, tag, and opcnt */
2635 	xdr_reserve_space(resp->xdr, XDR_UNIT * 2 + args->taglen);
2636 	resp->taglen = args->taglen;
2637 	resp->tag = args->tag;
2638 	resp->rqstp = rqstp;
2639 	cstate->minorversion = args->minorversion;
2640 	fh_init(current_fh, NFS4_FHSIZE);
2641 	fh_init(save_fh, NFS4_FHSIZE);
2642 	/*
2643 	 * Don't use the deferral mechanism for NFSv4; compounds make it
2644 	 * too hard to avoid non-idempotency problems.
2645 	 */
2646 	clear_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
2647 
2648 	/*
2649 	 * According to RFC3010, this takes precedence over all other errors.
2650 	 */
2651 	status = nfserr_minor_vers_mismatch;
2652 	if (nfsd_minorversion(nn, args->minorversion, NFSD_TEST) <= 0)
2653 		goto out;
2654 
2655 	status = nfs41_check_op_ordering(args);
2656 	if (status) {
2657 		op = &args->ops[0];
2658 		op->status = status;
2659 		resp->opcnt = 1;
2660 		goto encode_op;
2661 	}
2662 	check_if_stalefh_allowed(args);
2663 
2664 	rqstp->rq_lease_breaker = (void **)&cstate->clp;
2665 
2666 	trace_nfsd_compound(rqstp, args->tag, args->taglen, args->client_opcnt);
2667 	while (!status && resp->opcnt < args->opcnt) {
2668 		op = &args->ops[resp->opcnt++];
2669 
2670 		if (unlikely(resp->opcnt == NFSD_MAX_OPS_PER_COMPOUND)) {
2671 			/* If there are still more operations to process,
2672 			 * stop here and report NFS4ERR_RESOURCE. */
2673 			if (cstate->minorversion == 0 &&
2674 			    args->client_opcnt > resp->opcnt) {
2675 				op->status = nfserr_resource;
2676 				goto encode_op;
2677 			}
2678 		}
2679 
2680 		/*
2681 		 * The XDR decode routines may have pre-set op->status;
2682 		 * for example, if there is a miscellaneous XDR error
2683 		 * it will be set to nfserr_bad_xdr.
2684 		 */
2685 		if (op->status) {
2686 			if (op->opnum == OP_OPEN)
2687 				op->status = nfsd4_open_omfg(rqstp, cstate, op);
2688 			goto encode_op;
2689 		}
2690 		if (!current_fh->fh_dentry &&
2691 				!HAS_FH_FLAG(current_fh, NFSD4_FH_FOREIGN)) {
2692 			if (!(op->opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
2693 				op->status = nfserr_nofilehandle;
2694 				goto encode_op;
2695 			}
2696 		} else if (current_fh->fh_export &&
2697 			   current_fh->fh_export->ex_fslocs.migrated &&
2698 			  !(op->opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
2699 			op->status = nfserr_moved;
2700 			goto encode_op;
2701 		}
2702 
2703 		fh_clear_pre_post_attrs(current_fh);
2704 
2705 		/* If op is non-idempotent */
2706 		if (op->opdesc->op_flags & OP_MODIFIES_SOMETHING) {
2707 			/*
2708 			 * Don't execute this op if we couldn't encode a
2709 			 * successful reply:
2710 			 */
2711 			u32 plen = op->opdesc->op_rsize_bop(rqstp, op);
2712 			/*
2713 			 * Plus if there's another operation, make sure
2714 			 * we'll have space to at least encode an error:
2715 			 */
2716 			if (resp->opcnt < args->opcnt)
2717 				plen += COMPOUND_ERR_SLACK_SPACE;
2718 			op->status = nfsd4_check_resp_size(resp, plen);
2719 		}
2720 
2721 		if (op->status)
2722 			goto encode_op;
2723 
2724 		if (op->opdesc->op_get_currentstateid)
2725 			op->opdesc->op_get_currentstateid(cstate, &op->u);
2726 		op->status = op->opdesc->op_func(rqstp, cstate, &op->u);
2727 
2728 		/* Only from SEQUENCE */
2729 		if (cstate->status == nfserr_replay_cache) {
2730 			dprintk("%s NFS4.1 replay from cache\n", __func__);
2731 			status = op->status;
2732 			goto out;
2733 		}
2734 		if (!op->status) {
2735 			if (op->opdesc->op_set_currentstateid)
2736 				op->opdesc->op_set_currentstateid(cstate, &op->u);
2737 
2738 			if (op->opdesc->op_flags & OP_CLEAR_STATEID)
2739 				clear_current_stateid(cstate);
2740 
2741 			if (current_fh->fh_export &&
2742 					need_wrongsec_check(rqstp))
2743 				op->status = check_nfsd_access(current_fh->fh_export, rqstp);
2744 		}
2745 encode_op:
2746 		if (op->status == nfserr_replay_me) {
2747 			op->replay = &cstate->replay_owner->so_replay;
2748 			nfsd4_encode_replay(resp->xdr, op);
2749 			status = op->status = op->replay->rp_status;
2750 		} else {
2751 			nfsd4_encode_operation(resp, op);
2752 			status = op->status;
2753 		}
2754 
2755 		trace_nfsd_compound_status(args->client_opcnt, resp->opcnt,
2756 					   status, nfsd4_op_name(op->opnum));
2757 
2758 		nfsd4_cstate_clear_replay(cstate);
2759 		nfsd4_increment_op_stats(nn, op->opnum);
2760 	}
2761 
2762 	fh_put(current_fh);
2763 	fh_put(save_fh);
2764 	BUG_ON(cstate->replay_owner);
2765 out:
2766 	cstate->status = status;
2767 	/* Reset deferral mechanism for RPC deferrals */
2768 	set_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
2769 	return rpc_success;
2770 }
2771 
2772 #define op_encode_hdr_size		(2)
2773 #define op_encode_stateid_maxsz		(XDR_QUADLEN(NFS4_STATEID_SIZE))
2774 #define op_encode_verifier_maxsz	(XDR_QUADLEN(NFS4_VERIFIER_SIZE))
2775 #define op_encode_change_info_maxsz	(5)
2776 #define nfs4_fattr_bitmap_maxsz		(4)
2777 
2778 /* We'll fall back on returning no lockowner if run out of space: */
2779 #define op_encode_lockowner_maxsz	(0)
2780 #define op_encode_lock_denied_maxsz	(8 + op_encode_lockowner_maxsz)
2781 
2782 #define nfs4_owner_maxsz		(1 + XDR_QUADLEN(IDMAP_NAMESZ))
2783 
2784 #define op_encode_ace_maxsz		(3 + nfs4_owner_maxsz)
2785 #define op_encode_delegation_maxsz	(1 + op_encode_stateid_maxsz + 1 + \
2786 					 op_encode_ace_maxsz)
2787 
2788 #define op_encode_channel_attrs_maxsz	(6 + 1 + 1)
2789 
2790 /*
2791  * The _rsize() helpers are invoked by the NFSv4 COMPOUND decoder, which
2792  * is called before sunrpc sets rq_res.buflen. Thus we have to compute
2793  * the maximum payload size here, based on transport limits and the size
2794  * of the remaining space in the rq_pages array.
2795  */
nfsd4_max_payload(const struct svc_rqst * rqstp)2796 static u32 nfsd4_max_payload(const struct svc_rqst *rqstp)
2797 {
2798 	u32 buflen;
2799 
2800 	buflen = (rqstp->rq_page_end - rqstp->rq_next_page) * PAGE_SIZE;
2801 	buflen -= rqstp->rq_auth_slack;
2802 	buflen -= rqstp->rq_res.head[0].iov_len;
2803 	return min_t(u32, buflen, svc_max_payload(rqstp));
2804 }
2805 
nfsd4_only_status_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)2806 static u32 nfsd4_only_status_rsize(const struct svc_rqst *rqstp,
2807 				   const struct nfsd4_op *op)
2808 {
2809 	return (op_encode_hdr_size) * sizeof(__be32);
2810 }
2811 
nfsd4_status_stateid_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)2812 static u32 nfsd4_status_stateid_rsize(const struct svc_rqst *rqstp,
2813 				      const struct nfsd4_op *op)
2814 {
2815 	return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
2816 }
2817 
nfsd4_access_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)2818 static u32 nfsd4_access_rsize(const struct svc_rqst *rqstp,
2819 			      const struct nfsd4_op *op)
2820 {
2821 	/* ac_supported, ac_resp_access */
2822 	return (op_encode_hdr_size + 2)* sizeof(__be32);
2823 }
2824 
nfsd4_commit_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)2825 static u32 nfsd4_commit_rsize(const struct svc_rqst *rqstp,
2826 			      const struct nfsd4_op *op)
2827 {
2828 	return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
2829 }
2830 
nfsd4_create_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)2831 static u32 nfsd4_create_rsize(const struct svc_rqst *rqstp,
2832 			      const struct nfsd4_op *op)
2833 {
2834 	return (op_encode_hdr_size + op_encode_change_info_maxsz
2835 		+ nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
2836 }
2837 
2838 /*
2839  * Note since this is an idempotent operation we won't insist on failing
2840  * the op prematurely if the estimate is too large.  We may turn off splice
2841  * reads unnecessarily.
2842  */
nfsd4_getattr_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)2843 static u32 nfsd4_getattr_rsize(const struct svc_rqst *rqstp,
2844 			       const struct nfsd4_op *op)
2845 {
2846 	const u32 *bmap = op->u.getattr.ga_bmval;
2847 	u32 bmap0 = bmap[0], bmap1 = bmap[1], bmap2 = bmap[2];
2848 	u32 ret = 0;
2849 
2850 	if (bmap0 & FATTR4_WORD0_ACL)
2851 		return nfsd4_max_payload(rqstp);
2852 	if (bmap0 & FATTR4_WORD0_FS_LOCATIONS)
2853 		return nfsd4_max_payload(rqstp);
2854 
2855 	if (bmap1 & FATTR4_WORD1_OWNER) {
2856 		ret += IDMAP_NAMESZ + 4;
2857 		bmap1 &= ~FATTR4_WORD1_OWNER;
2858 	}
2859 	if (bmap1 & FATTR4_WORD1_OWNER_GROUP) {
2860 		ret += IDMAP_NAMESZ + 4;
2861 		bmap1 &= ~FATTR4_WORD1_OWNER_GROUP;
2862 	}
2863 	if (bmap0 & FATTR4_WORD0_FILEHANDLE) {
2864 		ret += NFS4_FHSIZE + 4;
2865 		bmap0 &= ~FATTR4_WORD0_FILEHANDLE;
2866 	}
2867 	if (bmap2 & FATTR4_WORD2_SECURITY_LABEL) {
2868 		ret += NFS4_MAXLABELLEN + 12;
2869 		bmap2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2870 	}
2871 	/*
2872 	 * Largest of remaining attributes are 16 bytes (e.g.,
2873 	 * supported_attributes)
2874 	 */
2875 	ret += 16 * (hweight32(bmap0) + hweight32(bmap1) + hweight32(bmap2));
2876 	/* bitmask, length */
2877 	ret += 20;
2878 	return ret;
2879 }
2880 
nfsd4_getfh_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)2881 static u32 nfsd4_getfh_rsize(const struct svc_rqst *rqstp,
2882 			     const struct nfsd4_op *op)
2883 {
2884 	return (op_encode_hdr_size + 1) * sizeof(__be32) + NFS4_FHSIZE;
2885 }
2886 
nfsd4_link_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)2887 static u32 nfsd4_link_rsize(const struct svc_rqst *rqstp,
2888 			    const struct nfsd4_op *op)
2889 {
2890 	return (op_encode_hdr_size + op_encode_change_info_maxsz)
2891 		* sizeof(__be32);
2892 }
2893 
nfsd4_lock_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)2894 static u32 nfsd4_lock_rsize(const struct svc_rqst *rqstp,
2895 			    const struct nfsd4_op *op)
2896 {
2897 	return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
2898 		* sizeof(__be32);
2899 }
2900 
nfsd4_open_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)2901 static u32 nfsd4_open_rsize(const struct svc_rqst *rqstp,
2902 			    const struct nfsd4_op *op)
2903 {
2904 	return (op_encode_hdr_size + op_encode_stateid_maxsz
2905 		+ op_encode_change_info_maxsz + 1
2906 		+ nfs4_fattr_bitmap_maxsz
2907 		+ op_encode_delegation_maxsz) * sizeof(__be32);
2908 }
2909 
nfsd4_read_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)2910 static u32 nfsd4_read_rsize(const struct svc_rqst *rqstp,
2911 			    const struct nfsd4_op *op)
2912 {
2913 	u32 rlen = min(op->u.read.rd_length, nfsd4_max_payload(rqstp));
2914 
2915 	return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
2916 }
2917 
nfsd4_read_plus_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)2918 static u32 nfsd4_read_plus_rsize(const struct svc_rqst *rqstp,
2919 				 const struct nfsd4_op *op)
2920 {
2921 	u32 rlen = min(op->u.read.rd_length, nfsd4_max_payload(rqstp));
2922 	/*
2923 	 * If we detect that the file changed during hole encoding, then we
2924 	 * recover by encoding the remaining reply as data. This means we need
2925 	 * to set aside enough room to encode two data segments.
2926 	 */
2927 	u32 seg_len = 2 * (1 + 2 + 1);
2928 
2929 	return (op_encode_hdr_size + 2 + seg_len + XDR_QUADLEN(rlen)) * sizeof(__be32);
2930 }
2931 
nfsd4_readdir_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)2932 static u32 nfsd4_readdir_rsize(const struct svc_rqst *rqstp,
2933 			       const struct nfsd4_op *op)
2934 {
2935 	u32 rlen = min(op->u.readdir.rd_maxcount, nfsd4_max_payload(rqstp));
2936 
2937 	return (op_encode_hdr_size + op_encode_verifier_maxsz +
2938 		XDR_QUADLEN(rlen)) * sizeof(__be32);
2939 }
2940 
nfsd4_readlink_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)2941 static u32 nfsd4_readlink_rsize(const struct svc_rqst *rqstp,
2942 				const struct nfsd4_op *op)
2943 {
2944 	return (op_encode_hdr_size + 1) * sizeof(__be32) + PAGE_SIZE;
2945 }
2946 
nfsd4_remove_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)2947 static u32 nfsd4_remove_rsize(const struct svc_rqst *rqstp,
2948 			      const struct nfsd4_op *op)
2949 {
2950 	return (op_encode_hdr_size + op_encode_change_info_maxsz)
2951 		* sizeof(__be32);
2952 }
2953 
nfsd4_rename_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)2954 static u32 nfsd4_rename_rsize(const struct svc_rqst *rqstp,
2955 			      const struct nfsd4_op *op)
2956 {
2957 	return (op_encode_hdr_size + op_encode_change_info_maxsz
2958 		+ op_encode_change_info_maxsz) * sizeof(__be32);
2959 }
2960 
nfsd4_sequence_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)2961 static u32 nfsd4_sequence_rsize(const struct svc_rqst *rqstp,
2962 				const struct nfsd4_op *op)
2963 {
2964 	return (op_encode_hdr_size
2965 		+ XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5) * sizeof(__be32);
2966 }
2967 
nfsd4_test_stateid_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)2968 static u32 nfsd4_test_stateid_rsize(const struct svc_rqst *rqstp,
2969 				    const struct nfsd4_op *op)
2970 {
2971 	return (op_encode_hdr_size + 1 + op->u.test_stateid.ts_num_ids)
2972 		* sizeof(__be32);
2973 }
2974 
nfsd4_setattr_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)2975 static u32 nfsd4_setattr_rsize(const struct svc_rqst *rqstp,
2976 			       const struct nfsd4_op *op)
2977 {
2978 	return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
2979 }
2980 
nfsd4_secinfo_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)2981 static u32 nfsd4_secinfo_rsize(const struct svc_rqst *rqstp,
2982 			       const struct nfsd4_op *op)
2983 {
2984 	return (op_encode_hdr_size + RPC_AUTH_MAXFLAVOR *
2985 		(4 + XDR_QUADLEN(GSS_OID_MAX_LEN))) * sizeof(__be32);
2986 }
2987 
nfsd4_setclientid_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)2988 static u32 nfsd4_setclientid_rsize(const struct svc_rqst *rqstp,
2989 				   const struct nfsd4_op *op)
2990 {
2991 	return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
2992 								sizeof(__be32);
2993 }
2994 
nfsd4_write_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)2995 static u32 nfsd4_write_rsize(const struct svc_rqst *rqstp,
2996 			     const struct nfsd4_op *op)
2997 {
2998 	return (op_encode_hdr_size + 2 + op_encode_verifier_maxsz) * sizeof(__be32);
2999 }
3000 
nfsd4_exchange_id_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)3001 static u32 nfsd4_exchange_id_rsize(const struct svc_rqst *rqstp,
3002 				   const struct nfsd4_op *op)
3003 {
3004 	return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
3005 		1 + 1 + /* eir_flags, spr_how */\
3006 		4 + /* spo_must_enforce & _allow with bitmap */\
3007 		2 + /*eir_server_owner.so_minor_id */\
3008 		/* eir_server_owner.so_major_id<> */\
3009 		XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
3010 		/* eir_server_scope<> */\
3011 		XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
3012 		1 + /* eir_server_impl_id array length */\
3013 		0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
3014 }
3015 
nfsd4_bind_conn_to_session_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)3016 static u32 nfsd4_bind_conn_to_session_rsize(const struct svc_rqst *rqstp,
3017 					    const struct nfsd4_op *op)
3018 {
3019 	return (op_encode_hdr_size + \
3020 		XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
3021 		2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
3022 }
3023 
nfsd4_create_session_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)3024 static u32 nfsd4_create_session_rsize(const struct svc_rqst *rqstp,
3025 				      const struct nfsd4_op *op)
3026 {
3027 	return (op_encode_hdr_size + \
3028 		XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
3029 		2 + /* csr_sequence, csr_flags */\
3030 		op_encode_channel_attrs_maxsz + \
3031 		op_encode_channel_attrs_maxsz) * sizeof(__be32);
3032 }
3033 
nfsd4_copy_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)3034 static u32 nfsd4_copy_rsize(const struct svc_rqst *rqstp,
3035 			    const struct nfsd4_op *op)
3036 {
3037 	return (op_encode_hdr_size +
3038 		1 /* wr_callback */ +
3039 		op_encode_stateid_maxsz /* wr_callback */ +
3040 		2 /* wr_count */ +
3041 		1 /* wr_committed */ +
3042 		op_encode_verifier_maxsz +
3043 		1 /* cr_consecutive */ +
3044 		1 /* cr_synchronous */) * sizeof(__be32);
3045 }
3046 
nfsd4_offload_status_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)3047 static u32 nfsd4_offload_status_rsize(const struct svc_rqst *rqstp,
3048 				      const struct nfsd4_op *op)
3049 {
3050 	return (op_encode_hdr_size +
3051 		2 /* osr_count */ +
3052 		1 /* osr_complete<1> optional 0 for now */) * sizeof(__be32);
3053 }
3054 
nfsd4_copy_notify_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)3055 static u32 nfsd4_copy_notify_rsize(const struct svc_rqst *rqstp,
3056 				   const struct nfsd4_op *op)
3057 {
3058 	return (op_encode_hdr_size +
3059 		3 /* cnr_lease_time */ +
3060 		1 /* We support one cnr_source_server */ +
3061 		1 /* cnr_stateid seq */ +
3062 		op_encode_stateid_maxsz /* cnr_stateid */ +
3063 		1 /* num cnr_source_server*/ +
3064 		1 /* nl4_type */ +
3065 		1 /* nl4 size */ +
3066 		XDR_QUADLEN(NFS4_OPAQUE_LIMIT) /*nl4_loc + nl4_loc_sz */)
3067 		* sizeof(__be32);
3068 }
3069 
3070 #ifdef CONFIG_NFSD_PNFS
nfsd4_getdeviceinfo_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)3071 static u32 nfsd4_getdeviceinfo_rsize(const struct svc_rqst *rqstp,
3072 				     const struct nfsd4_op *op)
3073 {
3074 	u32 rlen = min(op->u.getdeviceinfo.gd_maxcount, nfsd4_max_payload(rqstp));
3075 
3076 	return (op_encode_hdr_size +
3077 		1 /* gd_layout_type*/ +
3078 		XDR_QUADLEN(rlen) +
3079 		2 /* gd_notify_types */) * sizeof(__be32);
3080 }
3081 
3082 /*
3083  * At this stage we don't really know what layout driver will handle the request,
3084  * so we need to define an arbitrary upper bound here.
3085  */
3086 #define MAX_LAYOUT_SIZE		128
nfsd4_layoutget_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)3087 static u32 nfsd4_layoutget_rsize(const struct svc_rqst *rqstp,
3088 				 const struct nfsd4_op *op)
3089 {
3090 	return (op_encode_hdr_size +
3091 		1 /* logr_return_on_close */ +
3092 		op_encode_stateid_maxsz +
3093 		1 /* nr of layouts */ +
3094 		MAX_LAYOUT_SIZE) * sizeof(__be32);
3095 }
3096 
nfsd4_layoutcommit_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)3097 static u32 nfsd4_layoutcommit_rsize(const struct svc_rqst *rqstp,
3098 				    const struct nfsd4_op *op)
3099 {
3100 	return (op_encode_hdr_size +
3101 		1 /* locr_newsize */ +
3102 		2 /* ns_size */) * sizeof(__be32);
3103 }
3104 
nfsd4_layoutreturn_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)3105 static u32 nfsd4_layoutreturn_rsize(const struct svc_rqst *rqstp,
3106 				    const struct nfsd4_op *op)
3107 {
3108 	return (op_encode_hdr_size +
3109 		1 /* lrs_stateid */ +
3110 		op_encode_stateid_maxsz) * sizeof(__be32);
3111 }
3112 #endif /* CONFIG_NFSD_PNFS */
3113 
3114 
nfsd4_seek_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)3115 static u32 nfsd4_seek_rsize(const struct svc_rqst *rqstp,
3116 			    const struct nfsd4_op *op)
3117 {
3118 	return (op_encode_hdr_size + 3) * sizeof(__be32);
3119 }
3120 
nfsd4_getxattr_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)3121 static u32 nfsd4_getxattr_rsize(const struct svc_rqst *rqstp,
3122 				const struct nfsd4_op *op)
3123 {
3124 	u32 rlen = min_t(u32, XATTR_SIZE_MAX, nfsd4_max_payload(rqstp));
3125 
3126 	return (op_encode_hdr_size + 1 + XDR_QUADLEN(rlen)) * sizeof(__be32);
3127 }
3128 
nfsd4_setxattr_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)3129 static u32 nfsd4_setxattr_rsize(const struct svc_rqst *rqstp,
3130 				const struct nfsd4_op *op)
3131 {
3132 	return (op_encode_hdr_size + op_encode_change_info_maxsz)
3133 		* sizeof(__be32);
3134 }
nfsd4_listxattrs_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)3135 static u32 nfsd4_listxattrs_rsize(const struct svc_rqst *rqstp,
3136 				  const struct nfsd4_op *op)
3137 {
3138 	u32 rlen = min(op->u.listxattrs.lsxa_maxcount, nfsd4_max_payload(rqstp));
3139 
3140 	return (op_encode_hdr_size + 4 + XDR_QUADLEN(rlen)) * sizeof(__be32);
3141 }
3142 
nfsd4_removexattr_rsize(const struct svc_rqst * rqstp,const struct nfsd4_op * op)3143 static u32 nfsd4_removexattr_rsize(const struct svc_rqst *rqstp,
3144 				   const struct nfsd4_op *op)
3145 {
3146 	return (op_encode_hdr_size + op_encode_change_info_maxsz)
3147 		* sizeof(__be32);
3148 }
3149 
3150 
3151 static const struct nfsd4_operation nfsd4_ops[] = {
3152 	[OP_ACCESS] = {
3153 		.op_func = nfsd4_access,
3154 		.op_name = "OP_ACCESS",
3155 		.op_rsize_bop = nfsd4_access_rsize,
3156 	},
3157 	[OP_CLOSE] = {
3158 		.op_func = nfsd4_close,
3159 		.op_flags = OP_MODIFIES_SOMETHING,
3160 		.op_name = "OP_CLOSE",
3161 		.op_rsize_bop = nfsd4_status_stateid_rsize,
3162 		.op_get_currentstateid = nfsd4_get_closestateid,
3163 		.op_set_currentstateid = nfsd4_set_closestateid,
3164 	},
3165 	[OP_COMMIT] = {
3166 		.op_func = nfsd4_commit,
3167 		.op_flags = OP_MODIFIES_SOMETHING,
3168 		.op_name = "OP_COMMIT",
3169 		.op_rsize_bop = nfsd4_commit_rsize,
3170 	},
3171 	[OP_CREATE] = {
3172 		.op_func = nfsd4_create,
3173 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
3174 		.op_name = "OP_CREATE",
3175 		.op_rsize_bop = nfsd4_create_rsize,
3176 	},
3177 	[OP_DELEGRETURN] = {
3178 		.op_func = nfsd4_delegreturn,
3179 		.op_flags = OP_MODIFIES_SOMETHING,
3180 		.op_name = "OP_DELEGRETURN",
3181 		.op_rsize_bop = nfsd4_only_status_rsize,
3182 		.op_get_currentstateid = nfsd4_get_delegreturnstateid,
3183 	},
3184 	[OP_GETATTR] = {
3185 		.op_func = nfsd4_getattr,
3186 		.op_flags = ALLOWED_ON_ABSENT_FS,
3187 		.op_rsize_bop = nfsd4_getattr_rsize,
3188 		.op_name = "OP_GETATTR",
3189 	},
3190 	[OP_GETFH] = {
3191 		.op_func = nfsd4_getfh,
3192 		.op_name = "OP_GETFH",
3193 		.op_rsize_bop = nfsd4_getfh_rsize,
3194 	},
3195 	[OP_LINK] = {
3196 		.op_func = nfsd4_link,
3197 		.op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
3198 				| OP_CACHEME,
3199 		.op_name = "OP_LINK",
3200 		.op_rsize_bop = nfsd4_link_rsize,
3201 	},
3202 	[OP_LOCK] = {
3203 		.op_func = nfsd4_lock,
3204 		.op_flags = OP_MODIFIES_SOMETHING |
3205 				OP_NONTRIVIAL_ERROR_ENCODE,
3206 		.op_name = "OP_LOCK",
3207 		.op_rsize_bop = nfsd4_lock_rsize,
3208 		.op_set_currentstateid = nfsd4_set_lockstateid,
3209 	},
3210 	[OP_LOCKT] = {
3211 		.op_func = nfsd4_lockt,
3212 		.op_flags = OP_NONTRIVIAL_ERROR_ENCODE,
3213 		.op_name = "OP_LOCKT",
3214 		.op_rsize_bop = nfsd4_lock_rsize,
3215 	},
3216 	[OP_LOCKU] = {
3217 		.op_func = nfsd4_locku,
3218 		.op_flags = OP_MODIFIES_SOMETHING,
3219 		.op_name = "OP_LOCKU",
3220 		.op_rsize_bop = nfsd4_status_stateid_rsize,
3221 		.op_get_currentstateid = nfsd4_get_lockustateid,
3222 	},
3223 	[OP_LOOKUP] = {
3224 		.op_func = nfsd4_lookup,
3225 		.op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
3226 		.op_name = "OP_LOOKUP",
3227 		.op_rsize_bop = nfsd4_only_status_rsize,
3228 	},
3229 	[OP_LOOKUPP] = {
3230 		.op_func = nfsd4_lookupp,
3231 		.op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
3232 		.op_name = "OP_LOOKUPP",
3233 		.op_rsize_bop = nfsd4_only_status_rsize,
3234 	},
3235 	[OP_NVERIFY] = {
3236 		.op_func = nfsd4_nverify,
3237 		.op_name = "OP_NVERIFY",
3238 		.op_rsize_bop = nfsd4_only_status_rsize,
3239 	},
3240 	[OP_OPEN] = {
3241 		.op_func = nfsd4_open,
3242 		.op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
3243 		.op_name = "OP_OPEN",
3244 		.op_rsize_bop = nfsd4_open_rsize,
3245 		.op_set_currentstateid = nfsd4_set_openstateid,
3246 	},
3247 	[OP_OPEN_CONFIRM] = {
3248 		.op_func = nfsd4_open_confirm,
3249 		.op_flags = OP_MODIFIES_SOMETHING,
3250 		.op_name = "OP_OPEN_CONFIRM",
3251 		.op_rsize_bop = nfsd4_status_stateid_rsize,
3252 	},
3253 	[OP_OPEN_DOWNGRADE] = {
3254 		.op_func = nfsd4_open_downgrade,
3255 		.op_flags = OP_MODIFIES_SOMETHING,
3256 		.op_name = "OP_OPEN_DOWNGRADE",
3257 		.op_rsize_bop = nfsd4_status_stateid_rsize,
3258 		.op_get_currentstateid = nfsd4_get_opendowngradestateid,
3259 		.op_set_currentstateid = nfsd4_set_opendowngradestateid,
3260 	},
3261 	[OP_PUTFH] = {
3262 		.op_func = nfsd4_putfh,
3263 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3264 				| OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
3265 		.op_name = "OP_PUTFH",
3266 		.op_rsize_bop = nfsd4_only_status_rsize,
3267 	},
3268 	[OP_PUTPUBFH] = {
3269 		.op_func = nfsd4_putrootfh,
3270 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3271 				| OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
3272 		.op_name = "OP_PUTPUBFH",
3273 		.op_rsize_bop = nfsd4_only_status_rsize,
3274 	},
3275 	[OP_PUTROOTFH] = {
3276 		.op_func = nfsd4_putrootfh,
3277 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3278 				| OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
3279 		.op_name = "OP_PUTROOTFH",
3280 		.op_rsize_bop = nfsd4_only_status_rsize,
3281 	},
3282 	[OP_READ] = {
3283 		.op_func = nfsd4_read,
3284 		.op_release = nfsd4_read_release,
3285 		.op_name = "OP_READ",
3286 		.op_rsize_bop = nfsd4_read_rsize,
3287 		.op_get_currentstateid = nfsd4_get_readstateid,
3288 	},
3289 	[OP_READDIR] = {
3290 		.op_func = nfsd4_readdir,
3291 		.op_name = "OP_READDIR",
3292 		.op_rsize_bop = nfsd4_readdir_rsize,
3293 	},
3294 	[OP_READLINK] = {
3295 		.op_func = nfsd4_readlink,
3296 		.op_name = "OP_READLINK",
3297 		.op_rsize_bop = nfsd4_readlink_rsize,
3298 	},
3299 	[OP_REMOVE] = {
3300 		.op_func = nfsd4_remove,
3301 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
3302 		.op_name = "OP_REMOVE",
3303 		.op_rsize_bop = nfsd4_remove_rsize,
3304 	},
3305 	[OP_RENAME] = {
3306 		.op_func = nfsd4_rename,
3307 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
3308 		.op_name = "OP_RENAME",
3309 		.op_rsize_bop = nfsd4_rename_rsize,
3310 	},
3311 	[OP_RENEW] = {
3312 		.op_func = nfsd4_renew,
3313 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3314 				| OP_MODIFIES_SOMETHING,
3315 		.op_name = "OP_RENEW",
3316 		.op_rsize_bop = nfsd4_only_status_rsize,
3317 
3318 	},
3319 	[OP_RESTOREFH] = {
3320 		.op_func = nfsd4_restorefh,
3321 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3322 				| OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
3323 		.op_name = "OP_RESTOREFH",
3324 		.op_rsize_bop = nfsd4_only_status_rsize,
3325 	},
3326 	[OP_SAVEFH] = {
3327 		.op_func = nfsd4_savefh,
3328 		.op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
3329 		.op_name = "OP_SAVEFH",
3330 		.op_rsize_bop = nfsd4_only_status_rsize,
3331 	},
3332 	[OP_SECINFO] = {
3333 		.op_func = nfsd4_secinfo,
3334 		.op_release = nfsd4_secinfo_release,
3335 		.op_flags = OP_HANDLES_WRONGSEC,
3336 		.op_name = "OP_SECINFO",
3337 		.op_rsize_bop = nfsd4_secinfo_rsize,
3338 	},
3339 	[OP_SETATTR] = {
3340 		.op_func = nfsd4_setattr,
3341 		.op_name = "OP_SETATTR",
3342 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME
3343 				| OP_NONTRIVIAL_ERROR_ENCODE,
3344 		.op_rsize_bop = nfsd4_setattr_rsize,
3345 		.op_get_currentstateid = nfsd4_get_setattrstateid,
3346 	},
3347 	[OP_SETCLIENTID] = {
3348 		.op_func = nfsd4_setclientid,
3349 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3350 				| OP_MODIFIES_SOMETHING | OP_CACHEME
3351 				| OP_NONTRIVIAL_ERROR_ENCODE,
3352 		.op_name = "OP_SETCLIENTID",
3353 		.op_rsize_bop = nfsd4_setclientid_rsize,
3354 	},
3355 	[OP_SETCLIENTID_CONFIRM] = {
3356 		.op_func = nfsd4_setclientid_confirm,
3357 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3358 				| OP_MODIFIES_SOMETHING | OP_CACHEME,
3359 		.op_name = "OP_SETCLIENTID_CONFIRM",
3360 		.op_rsize_bop = nfsd4_only_status_rsize,
3361 	},
3362 	[OP_VERIFY] = {
3363 		.op_func = nfsd4_verify,
3364 		.op_name = "OP_VERIFY",
3365 		.op_rsize_bop = nfsd4_only_status_rsize,
3366 	},
3367 	[OP_WRITE] = {
3368 		.op_func = nfsd4_write,
3369 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
3370 		.op_name = "OP_WRITE",
3371 		.op_rsize_bop = nfsd4_write_rsize,
3372 		.op_get_currentstateid = nfsd4_get_writestateid,
3373 	},
3374 	[OP_RELEASE_LOCKOWNER] = {
3375 		.op_func = nfsd4_release_lockowner,
3376 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3377 				| OP_MODIFIES_SOMETHING,
3378 		.op_name = "OP_RELEASE_LOCKOWNER",
3379 		.op_rsize_bop = nfsd4_only_status_rsize,
3380 	},
3381 
3382 	/* NFSv4.1 operations */
3383 	[OP_EXCHANGE_ID] = {
3384 		.op_func = nfsd4_exchange_id,
3385 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
3386 				| OP_MODIFIES_SOMETHING,
3387 		.op_name = "OP_EXCHANGE_ID",
3388 		.op_rsize_bop = nfsd4_exchange_id_rsize,
3389 	},
3390 	[OP_BACKCHANNEL_CTL] = {
3391 		.op_func = nfsd4_backchannel_ctl,
3392 		.op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
3393 		.op_name = "OP_BACKCHANNEL_CTL",
3394 		.op_rsize_bop = nfsd4_only_status_rsize,
3395 	},
3396 	[OP_BIND_CONN_TO_SESSION] = {
3397 		.op_func = nfsd4_bind_conn_to_session,
3398 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
3399 				| OP_MODIFIES_SOMETHING,
3400 		.op_name = "OP_BIND_CONN_TO_SESSION",
3401 		.op_rsize_bop = nfsd4_bind_conn_to_session_rsize,
3402 	},
3403 	[OP_CREATE_SESSION] = {
3404 		.op_func = nfsd4_create_session,
3405 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
3406 				| OP_MODIFIES_SOMETHING,
3407 		.op_name = "OP_CREATE_SESSION",
3408 		.op_rsize_bop = nfsd4_create_session_rsize,
3409 	},
3410 	[OP_DESTROY_SESSION] = {
3411 		.op_func = nfsd4_destroy_session,
3412 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
3413 				| OP_MODIFIES_SOMETHING,
3414 		.op_name = "OP_DESTROY_SESSION",
3415 		.op_rsize_bop = nfsd4_only_status_rsize,
3416 	},
3417 	[OP_SEQUENCE] = {
3418 		.op_func = nfsd4_sequence,
3419 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
3420 		.op_name = "OP_SEQUENCE",
3421 		.op_rsize_bop = nfsd4_sequence_rsize,
3422 	},
3423 	[OP_DESTROY_CLIENTID] = {
3424 		.op_func = nfsd4_destroy_clientid,
3425 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
3426 				| OP_MODIFIES_SOMETHING,
3427 		.op_name = "OP_DESTROY_CLIENTID",
3428 		.op_rsize_bop = nfsd4_only_status_rsize,
3429 	},
3430 	[OP_RECLAIM_COMPLETE] = {
3431 		.op_func = nfsd4_reclaim_complete,
3432 		.op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
3433 		.op_name = "OP_RECLAIM_COMPLETE",
3434 		.op_rsize_bop = nfsd4_only_status_rsize,
3435 	},
3436 	[OP_SECINFO_NO_NAME] = {
3437 		.op_func = nfsd4_secinfo_no_name,
3438 		.op_release = nfsd4_secinfo_no_name_release,
3439 		.op_flags = OP_HANDLES_WRONGSEC,
3440 		.op_name = "OP_SECINFO_NO_NAME",
3441 		.op_rsize_bop = nfsd4_secinfo_rsize,
3442 	},
3443 	[OP_TEST_STATEID] = {
3444 		.op_func = nfsd4_test_stateid,
3445 		.op_flags = ALLOWED_WITHOUT_FH,
3446 		.op_name = "OP_TEST_STATEID",
3447 		.op_rsize_bop = nfsd4_test_stateid_rsize,
3448 	},
3449 	[OP_FREE_STATEID] = {
3450 		.op_func = nfsd4_free_stateid,
3451 		.op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
3452 		.op_name = "OP_FREE_STATEID",
3453 		.op_get_currentstateid = nfsd4_get_freestateid,
3454 		.op_rsize_bop = nfsd4_only_status_rsize,
3455 	},
3456 #ifdef CONFIG_NFSD_PNFS
3457 	[OP_GETDEVICEINFO] = {
3458 		.op_func = nfsd4_getdeviceinfo,
3459 		.op_release = nfsd4_getdeviceinfo_release,
3460 		.op_flags = ALLOWED_WITHOUT_FH,
3461 		.op_name = "OP_GETDEVICEINFO",
3462 		.op_rsize_bop = nfsd4_getdeviceinfo_rsize,
3463 	},
3464 	[OP_LAYOUTGET] = {
3465 		.op_func = nfsd4_layoutget,
3466 		.op_release = nfsd4_layoutget_release,
3467 		.op_flags = OP_MODIFIES_SOMETHING,
3468 		.op_name = "OP_LAYOUTGET",
3469 		.op_rsize_bop = nfsd4_layoutget_rsize,
3470 	},
3471 	[OP_LAYOUTCOMMIT] = {
3472 		.op_func = nfsd4_layoutcommit,
3473 		.op_flags = OP_MODIFIES_SOMETHING,
3474 		.op_name = "OP_LAYOUTCOMMIT",
3475 		.op_rsize_bop = nfsd4_layoutcommit_rsize,
3476 	},
3477 	[OP_LAYOUTRETURN] = {
3478 		.op_func = nfsd4_layoutreturn,
3479 		.op_flags = OP_MODIFIES_SOMETHING,
3480 		.op_name = "OP_LAYOUTRETURN",
3481 		.op_rsize_bop = nfsd4_layoutreturn_rsize,
3482 	},
3483 #endif /* CONFIG_NFSD_PNFS */
3484 
3485 	/* NFSv4.2 operations */
3486 	[OP_ALLOCATE] = {
3487 		.op_func = nfsd4_allocate,
3488 		.op_flags = OP_MODIFIES_SOMETHING,
3489 		.op_name = "OP_ALLOCATE",
3490 		.op_rsize_bop = nfsd4_only_status_rsize,
3491 	},
3492 	[OP_DEALLOCATE] = {
3493 		.op_func = nfsd4_deallocate,
3494 		.op_flags = OP_MODIFIES_SOMETHING,
3495 		.op_name = "OP_DEALLOCATE",
3496 		.op_rsize_bop = nfsd4_only_status_rsize,
3497 	},
3498 	[OP_CLONE] = {
3499 		.op_func = nfsd4_clone,
3500 		.op_flags = OP_MODIFIES_SOMETHING,
3501 		.op_name = "OP_CLONE",
3502 		.op_rsize_bop = nfsd4_only_status_rsize,
3503 	},
3504 	[OP_COPY] = {
3505 		.op_func = nfsd4_copy,
3506 		.op_flags = OP_MODIFIES_SOMETHING,
3507 		.op_name = "OP_COPY",
3508 		.op_rsize_bop = nfsd4_copy_rsize,
3509 	},
3510 	[OP_READ_PLUS] = {
3511 		.op_func = nfsd4_read,
3512 		.op_release = nfsd4_read_release,
3513 		.op_name = "OP_READ_PLUS",
3514 		.op_rsize_bop = nfsd4_read_plus_rsize,
3515 		.op_get_currentstateid = nfsd4_get_readstateid,
3516 	},
3517 	[OP_SEEK] = {
3518 		.op_func = nfsd4_seek,
3519 		.op_name = "OP_SEEK",
3520 		.op_rsize_bop = nfsd4_seek_rsize,
3521 	},
3522 	[OP_OFFLOAD_STATUS] = {
3523 		.op_func = nfsd4_offload_status,
3524 		.op_name = "OP_OFFLOAD_STATUS",
3525 		.op_rsize_bop = nfsd4_offload_status_rsize,
3526 	},
3527 	[OP_OFFLOAD_CANCEL] = {
3528 		.op_func = nfsd4_offload_cancel,
3529 		.op_flags = OP_MODIFIES_SOMETHING,
3530 		.op_name = "OP_OFFLOAD_CANCEL",
3531 		.op_rsize_bop = nfsd4_only_status_rsize,
3532 	},
3533 	[OP_COPY_NOTIFY] = {
3534 		.op_func = nfsd4_copy_notify,
3535 		.op_flags = OP_MODIFIES_SOMETHING,
3536 		.op_name = "OP_COPY_NOTIFY",
3537 		.op_rsize_bop = nfsd4_copy_notify_rsize,
3538 	},
3539 	[OP_GETXATTR] = {
3540 		.op_func = nfsd4_getxattr,
3541 		.op_name = "OP_GETXATTR",
3542 		.op_rsize_bop = nfsd4_getxattr_rsize,
3543 	},
3544 	[OP_SETXATTR] = {
3545 		.op_func = nfsd4_setxattr,
3546 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
3547 		.op_name = "OP_SETXATTR",
3548 		.op_rsize_bop = nfsd4_setxattr_rsize,
3549 	},
3550 	[OP_LISTXATTRS] = {
3551 		.op_func = nfsd4_listxattrs,
3552 		.op_name = "OP_LISTXATTRS",
3553 		.op_rsize_bop = nfsd4_listxattrs_rsize,
3554 	},
3555 	[OP_REMOVEXATTR] = {
3556 		.op_func = nfsd4_removexattr,
3557 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
3558 		.op_name = "OP_REMOVEXATTR",
3559 		.op_rsize_bop = nfsd4_removexattr_rsize,
3560 	},
3561 };
3562 
3563 /**
3564  * nfsd4_spo_must_allow - Determine if the compound op contains an
3565  * operation that is allowed to be sent with machine credentials
3566  *
3567  * @rqstp: a pointer to the struct svc_rqst
3568  *
3569  * Checks to see if the compound contains a spo_must_allow op
3570  * and confirms that it was sent with the proper machine creds.
3571  */
3572 
nfsd4_spo_must_allow(struct svc_rqst * rqstp)3573 bool nfsd4_spo_must_allow(struct svc_rqst *rqstp)
3574 {
3575 	struct nfsd4_compoundres *resp = rqstp->rq_resp;
3576 	struct nfsd4_compoundargs *argp = rqstp->rq_argp;
3577 	struct nfsd4_op *this;
3578 	struct nfsd4_compound_state *cstate = &resp->cstate;
3579 	struct nfs4_op_map *allow = &cstate->clp->cl_spo_must_allow;
3580 	u32 opiter;
3581 
3582 	if (!cstate->minorversion)
3583 		return false;
3584 
3585 	if (cstate->spo_must_allowed)
3586 		return true;
3587 
3588 	opiter = resp->opcnt;
3589 	while (opiter < argp->opcnt) {
3590 		this = &argp->ops[opiter++];
3591 		if (test_bit(this->opnum, allow->u.longs) &&
3592 			cstate->clp->cl_mach_cred &&
3593 			nfsd4_mach_creds_match(cstate->clp, rqstp)) {
3594 			cstate->spo_must_allowed = true;
3595 			return true;
3596 		}
3597 	}
3598 	cstate->spo_must_allowed = false;
3599 	return false;
3600 }
3601 
nfsd4_max_reply(struct svc_rqst * rqstp,struct nfsd4_op * op)3602 int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
3603 {
3604 	if (op->opnum == OP_ILLEGAL || op->status == nfserr_notsupp)
3605 		return op_encode_hdr_size * sizeof(__be32);
3606 
3607 	BUG_ON(OPDESC(op)->op_rsize_bop == NULL);
3608 	return OPDESC(op)->op_rsize_bop(rqstp, op);
3609 }
3610 
warn_on_nonidempotent_op(struct nfsd4_op * op)3611 void warn_on_nonidempotent_op(struct nfsd4_op *op)
3612 {
3613 	if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
3614 		pr_err("unable to encode reply to nonidempotent op %u (%s)\n",
3615 			op->opnum, nfsd4_op_name(op->opnum));
3616 		WARN_ON_ONCE(1);
3617 	}
3618 }
3619 
nfsd4_op_name(unsigned opnum)3620 static const char *nfsd4_op_name(unsigned opnum)
3621 {
3622 	if (opnum < ARRAY_SIZE(nfsd4_ops))
3623 		return nfsd4_ops[opnum].op_name;
3624 	return "unknown_operation";
3625 }
3626 
3627 static const struct svc_procedure nfsd_procedures4[2] = {
3628 	[NFSPROC4_NULL] = {
3629 		.pc_func = nfsd4_proc_null,
3630 		.pc_decode = nfssvc_decode_voidarg,
3631 		.pc_encode = nfssvc_encode_voidres,
3632 		.pc_argsize = sizeof(struct nfsd_voidargs),
3633 		.pc_argzero = sizeof(struct nfsd_voidargs),
3634 		.pc_ressize = sizeof(struct nfsd_voidres),
3635 		.pc_cachetype = RC_NOCACHE,
3636 		.pc_xdrressize = 1,
3637 		.pc_name = "NULL",
3638 	},
3639 	[NFSPROC4_COMPOUND] = {
3640 		.pc_func = nfsd4_proc_compound,
3641 		.pc_decode = nfs4svc_decode_compoundargs,
3642 		.pc_encode = nfs4svc_encode_compoundres,
3643 		.pc_argsize = sizeof(struct nfsd4_compoundargs),
3644 		.pc_argzero = offsetof(struct nfsd4_compoundargs, iops),
3645 		.pc_ressize = sizeof(struct nfsd4_compoundres),
3646 		.pc_release = nfsd4_release_compoundargs,
3647 		.pc_cachetype = RC_NOCACHE,
3648 		.pc_xdrressize = NFSD_BUFSIZE/4,
3649 		.pc_name = "COMPOUND",
3650 	},
3651 };
3652 
3653 static DEFINE_PER_CPU_ALIGNED(unsigned long,
3654 			      nfsd_count4[ARRAY_SIZE(nfsd_procedures4)]);
3655 const struct svc_version nfsd_version4 = {
3656 	.vs_vers		= 4,
3657 	.vs_nproc		= ARRAY_SIZE(nfsd_procedures4),
3658 	.vs_proc		= nfsd_procedures4,
3659 	.vs_count		= nfsd_count4,
3660 	.vs_dispatch		= nfsd_dispatch,
3661 	.vs_xdrsize		= NFS4_SVC_XDRSIZE,
3662 	.vs_rpcb_optnl		= true,
3663 	.vs_need_cong_ctrl	= true,
3664 };
3665