1 /*
2 * Server-side procedures for NFSv4.
3 *
4 * Copyright (c) 2002 The Regents of the University of Michigan.
5 * All rights reserved.
6 *
7 * Kendrick Smith <kmsmith@umich.edu>
8 * Andy Adamson <andros@umich.edu>
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 *
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its
20 * contributors may be used to endorse or promote products derived
21 * from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35 #include <linux/fs_struct.h>
36 #include <linux/file.h>
37 #include <linux/falloc.h>
38 #include <linux/slab.h>
39 #include <linux/kthread.h>
40 #include <linux/namei.h>
41
42 #include <linux/sunrpc/addr.h>
43 #include <linux/nfs_ssc.h>
44
45 #include "idmap.h"
46 #include "cache.h"
47 #include "xdr4.h"
48 #include "vfs.h"
49 #include "current_stateid.h"
50 #include "netns.h"
51 #include "acl.h"
52 #include "pnfs.h"
53 #include "trace.h"
54
55 static bool inter_copy_offload_enable;
56 module_param(inter_copy_offload_enable, bool, 0644);
57 MODULE_PARM_DESC(inter_copy_offload_enable,
58 "Enable inter server to server copy offload. Default: false");
59
60 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
61 static int nfsd4_ssc_umount_timeout = 900000; /* default to 15 mins */
62 module_param(nfsd4_ssc_umount_timeout, int, 0644);
63 MODULE_PARM_DESC(nfsd4_ssc_umount_timeout,
64 "idle msecs before unmount export from source server");
65 #endif
66
67 #define NFSDDBG_FACILITY NFSDDBG_PROC
68
69 static u32 nfsd_attrmask[] = {
70 NFSD_WRITEABLE_ATTRS_WORD0,
71 NFSD_WRITEABLE_ATTRS_WORD1,
72 NFSD_WRITEABLE_ATTRS_WORD2
73 };
74
75 static u32 nfsd41_ex_attrmask[] = {
76 NFSD_SUPPATTR_EXCLCREAT_WORD0,
77 NFSD_SUPPATTR_EXCLCREAT_WORD1,
78 NFSD_SUPPATTR_EXCLCREAT_WORD2
79 };
80
81 static __be32
82 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
83 u32 *bmval, u32 *writable)
84 {
85 struct dentry *dentry = cstate->current_fh.fh_dentry;
86 struct svc_export *exp = cstate->current_fh.fh_export;
87
88 if (!nfsd_attrs_supported(cstate->minorversion, bmval))
89 return nfserr_attrnotsupp;
90 if ((bmval[0] & FATTR4_WORD0_ACL) && !IS_POSIXACL(d_inode(dentry)))
91 return nfserr_attrnotsupp;
92 if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) &&
93 !(exp->ex_flags & NFSEXP_SECURITY_LABEL))
94 return nfserr_attrnotsupp;
95 if (writable && !bmval_is_subset(bmval, writable))
96 return nfserr_inval;
97 if (writable && (bmval[2] & FATTR4_WORD2_MODE_UMASK) &&
98 (bmval[1] & FATTR4_WORD1_MODE))
99 return nfserr_inval;
100 return nfs_ok;
101 }
102
103 static __be32
104 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
105 struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
106 {
107 __be32 status = nfs_ok;
108
109 if (open->op_create == NFS4_OPEN_CREATE) {
110 if (open->op_createmode == NFS4_CREATE_UNCHECKED
111 || open->op_createmode == NFS4_CREATE_GUARDED)
112 status = check_attr_support(rqstp, cstate,
113 open->op_bmval, nfsd_attrmask);
114 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
115 status = check_attr_support(rqstp, cstate,
116 open->op_bmval, nfsd41_ex_attrmask);
117 }
118
119 return status;
120 }
121
122 static int
123 is_create_with_attrs(struct nfsd4_open *open)
124 {
125 return open->op_create == NFS4_OPEN_CREATE
126 && (open->op_createmode == NFS4_CREATE_UNCHECKED
127 || open->op_createmode == NFS4_CREATE_GUARDED
128 || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
129 }
130
131 static inline void
132 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
133 {
134 fh_put(dst);
135 dget(src->fh_dentry);
136 if (src->fh_export)
137 exp_get(src->fh_export);
138 *dst = *src;
139 }
140
141 static __be32
142 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
143 {
144
145 if (open->op_truncate &&
146 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
147 return nfserr_inval;
148
149 accmode |= NFSD_MAY_READ_IF_EXEC;
150
151 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
152 accmode |= NFSD_MAY_READ;
153 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
154 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
155 if (open->op_share_deny & NFS4_SHARE_DENY_READ)
156 accmode |= NFSD_MAY_WRITE;
157
158 return fh_verify(rqstp, current_fh, S_IFREG, accmode);
159 }
160
161 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
162 {
163 umode_t mode = d_inode(fh->fh_dentry)->i_mode;
164
165 if (S_ISREG(mode))
166 return nfs_ok;
167 if (S_ISDIR(mode))
168 return nfserr_isdir;
169 /*
170 * Using err_symlink as our catch-all case may look odd; but
171 * there's no other obvious error for this case in 4.0, and we
172 * happen to know that it will cause the linux v4 client to do
173 * the right thing on attempts to open something other than a
174 * regular file.
175 */
176 return nfserr_symlink;
177 }
178
179 static void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh *resfh)
180 {
181 if (nfsd4_has_session(cstate))
182 return;
183 fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
184 &resfh->fh_handle);
185 }
186
187 static inline bool nfsd4_create_is_exclusive(int createmode)
188 {
189 return createmode == NFS4_CREATE_EXCLUSIVE ||
190 createmode == NFS4_CREATE_EXCLUSIVE4_1;
191 }
192
193 static __be32
194 nfsd4_vfs_create(struct svc_fh *fhp, struct dentry *child,
195 struct nfsd4_open *open)
196 {
197 struct file *filp;
198 struct path path;
199 int oflags;
200
201 oflags = O_CREAT | O_LARGEFILE;
202 switch (open->op_share_access & NFS4_SHARE_ACCESS_BOTH) {
203 case NFS4_SHARE_ACCESS_WRITE:
204 oflags |= O_WRONLY;
205 break;
206 case NFS4_SHARE_ACCESS_BOTH:
207 oflags |= O_RDWR;
208 break;
209 default:
210 oflags |= O_RDONLY;
211 }
212
213 path.mnt = fhp->fh_export->ex_path.mnt;
214 path.dentry = child;
215 filp = dentry_create(&path, oflags, open->op_iattr.ia_mode,
216 current_cred());
217 if (IS_ERR(filp))
218 return nfserrno(PTR_ERR(filp));
219
220 open->op_filp = filp;
221 return nfs_ok;
222 }
223
224 /*
225 * Implement NFSv4's unchecked, guarded, and exclusive create
226 * semantics for regular files. Open state for this new file is
227 * subsequently fabricated in nfsd4_process_open2().
228 *
229 * Upon return, caller must release @fhp and @resfhp.
230 */
231 static __be32
232 nfsd4_create_file(struct svc_rqst *rqstp, struct svc_fh *fhp,
233 struct svc_fh *resfhp, struct nfsd4_open *open)
234 {
235 struct iattr *iap = &open->op_iattr;
236 struct nfsd_attrs attrs = {
237 .na_iattr = iap,
238 .na_seclabel = &open->op_label,
239 };
240 struct dentry *parent, *child;
241 __u32 v_mtime, v_atime;
242 struct inode *inode;
243 __be32 status;
244 int host_err;
245
246 if (isdotent(open->op_fname, open->op_fnamelen))
247 return nfserr_exist;
248 if (!(iap->ia_valid & ATTR_MODE))
249 iap->ia_mode = 0;
250
251 status = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC);
252 if (status != nfs_ok)
253 return status;
254 parent = fhp->fh_dentry;
255 inode = d_inode(parent);
256
257 host_err = fh_want_write(fhp);
258 if (host_err)
259 return nfserrno(host_err);
260
261 if (is_create_with_attrs(open))
262 nfsd4_acl_to_attr(NF4REG, open->op_acl, &attrs);
263
264 inode_lock_nested(inode, I_MUTEX_PARENT);
265
266 child = lookup_one_len(open->op_fname, parent, open->op_fnamelen);
267 if (IS_ERR(child)) {
268 status = nfserrno(PTR_ERR(child));
269 goto out;
270 }
271
272 if (d_really_is_negative(child)) {
273 status = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE);
274 if (status != nfs_ok)
275 goto out;
276 }
277
278 status = fh_compose(resfhp, fhp->fh_export, child, fhp);
279 if (status != nfs_ok)
280 goto out;
281
282 v_mtime = 0;
283 v_atime = 0;
284 if (nfsd4_create_is_exclusive(open->op_createmode)) {
285 u32 *verifier = (u32 *)open->op_verf.data;
286
287 /*
288 * Solaris 7 gets confused (bugid 4218508) if these have
289 * the high bit set, as do xfs filesystems without the
290 * "bigtime" feature. So just clear the high bits. If this
291 * is ever changed to use different attrs for storing the
292 * verifier, then do_open_lookup() will also need to be
293 * fixed accordingly.
294 */
295 v_mtime = verifier[0] & 0x7fffffff;
296 v_atime = verifier[1] & 0x7fffffff;
297 }
298
299 if (d_really_is_positive(child)) {
300 /* 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 (inode_get_mtime_sec(d_inode(child)) == v_mtime &&
326 inode_get_atime_sec(d_inode(child)) == 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 (inode_get_mtime_sec(d_inode(child)) == v_mtime &&
335 inode_get_atime_sec(d_inode(child)) == 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
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
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
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
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
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 */
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
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
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
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
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
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
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
754 static __be32
755 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
756 union nfsd4_op_u *u)
757 {
758 struct nfsd4_commit *commit = &u->commit;
759 struct nfsd_file *nf;
760 __be32 status;
761
762 status = nfsd_file_acquire(rqstp, &cstate->current_fh, NFSD_MAY_WRITE |
763 NFSD_MAY_NOT_BREAK_LEASE, &nf);
764 if (status != nfs_ok)
765 return status;
766
767 status = nfsd_commit(rqstp, &cstate->current_fh, nf, commit->co_offset,
768 commit->co_count,
769 (__be32 *)commit->co_verf.data);
770 nfsd_file_put(nf);
771 return status;
772 }
773
774 static __be32
775 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
776 union nfsd4_op_u *u)
777 {
778 struct nfsd4_create *create = &u->create;
779 struct nfsd_attrs attrs = {
780 .na_iattr = &create->cr_iattr,
781 .na_seclabel = &create->cr_label,
782 };
783 struct svc_fh resfh;
784 __be32 status;
785 dev_t rdev;
786
787 fh_init(&resfh, NFS4_FHSIZE);
788
789 status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_NOP);
790 if (status)
791 return status;
792
793 status = check_attr_support(rqstp, cstate, create->cr_bmval,
794 nfsd_attrmask);
795 if (status)
796 return status;
797
798 status = nfsd4_acl_to_attr(create->cr_type, create->cr_acl, &attrs);
799 current->fs->umask = create->cr_umask;
800 switch (create->cr_type) {
801 case NF4LNK:
802 status = nfsd_symlink(rqstp, &cstate->current_fh,
803 create->cr_name, create->cr_namelen,
804 create->cr_data, &attrs, &resfh);
805 break;
806
807 case NF4BLK:
808 status = nfserr_inval;
809 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
810 if (MAJOR(rdev) != create->cr_specdata1 ||
811 MINOR(rdev) != create->cr_specdata2)
812 goto out_umask;
813 status = nfsd_create(rqstp, &cstate->current_fh,
814 create->cr_name, create->cr_namelen,
815 &attrs, S_IFBLK, rdev, &resfh);
816 break;
817
818 case NF4CHR:
819 status = nfserr_inval;
820 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
821 if (MAJOR(rdev) != create->cr_specdata1 ||
822 MINOR(rdev) != create->cr_specdata2)
823 goto out_umask;
824 status = nfsd_create(rqstp, &cstate->current_fh,
825 create->cr_name, create->cr_namelen,
826 &attrs, S_IFCHR, rdev, &resfh);
827 break;
828
829 case NF4SOCK:
830 status = nfsd_create(rqstp, &cstate->current_fh,
831 create->cr_name, create->cr_namelen,
832 &attrs, S_IFSOCK, 0, &resfh);
833 break;
834
835 case NF4FIFO:
836 status = nfsd_create(rqstp, &cstate->current_fh,
837 create->cr_name, create->cr_namelen,
838 &attrs, S_IFIFO, 0, &resfh);
839 break;
840
841 case NF4DIR:
842 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
843 status = nfsd_create(rqstp, &cstate->current_fh,
844 create->cr_name, create->cr_namelen,
845 &attrs, S_IFDIR, 0, &resfh);
846 break;
847
848 default:
849 status = nfserr_badtype;
850 }
851
852 if (status)
853 goto out;
854
855 if (attrs.na_labelerr)
856 create->cr_bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
857 if (attrs.na_aclerr)
858 create->cr_bmval[0] &= ~FATTR4_WORD0_ACL;
859 set_change_info(&create->cr_cinfo, &cstate->current_fh);
860 fh_dup2(&cstate->current_fh, &resfh);
861 out:
862 fh_put(&resfh);
863 out_umask:
864 current->fs->umask = 0;
865 nfsd_attrs_free(&attrs);
866 return status;
867 }
868
869 static __be32
870 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
871 union nfsd4_op_u *u)
872 {
873 struct nfsd4_getattr *getattr = &u->getattr;
874 __be32 status;
875
876 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
877 if (status)
878 return status;
879
880 if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
881 return nfserr_inval;
882
883 getattr->ga_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
884 getattr->ga_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
885 getattr->ga_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
886
887 getattr->ga_fhp = &cstate->current_fh;
888 return nfs_ok;
889 }
890
891 static __be32
892 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
893 union nfsd4_op_u *u)
894 {
895 struct nfsd4_link *link = &u->link;
896 __be32 status;
897
898 status = nfsd_link(rqstp, &cstate->current_fh,
899 link->li_name, link->li_namelen, &cstate->save_fh);
900 if (!status)
901 set_change_info(&link->li_cinfo, &cstate->current_fh);
902 return status;
903 }
904
905 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
906 {
907 struct svc_fh tmp_fh;
908 __be32 ret;
909
910 fh_init(&tmp_fh, NFS4_FHSIZE);
911 ret = exp_pseudoroot(rqstp, &tmp_fh);
912 if (ret)
913 return ret;
914 if (tmp_fh.fh_dentry == fh->fh_dentry) {
915 fh_put(&tmp_fh);
916 return nfserr_noent;
917 }
918 fh_put(&tmp_fh);
919 return nfsd_lookup(rqstp, fh, "..", 2, fh);
920 }
921
922 static __be32
923 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
924 union nfsd4_op_u *u)
925 {
926 return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
927 }
928
929 static __be32
930 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
931 union nfsd4_op_u *u)
932 {
933 return nfsd_lookup(rqstp, &cstate->current_fh,
934 u->lookup.lo_name, u->lookup.lo_len,
935 &cstate->current_fh);
936 }
937
938 static __be32
939 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
940 union nfsd4_op_u *u)
941 {
942 struct nfsd4_read *read = &u->read;
943 __be32 status;
944
945 read->rd_nf = NULL;
946
947 trace_nfsd_read_start(rqstp, &cstate->current_fh,
948 read->rd_offset, read->rd_length);
949
950 read->rd_length = min_t(u32, read->rd_length, svc_max_payload(rqstp));
951 if (read->rd_offset > (u64)OFFSET_MAX)
952 read->rd_offset = (u64)OFFSET_MAX;
953 if (read->rd_offset + read->rd_length > (u64)OFFSET_MAX)
954 read->rd_length = (u64)OFFSET_MAX - read->rd_offset;
955
956 /*
957 * If we do a zero copy read, then a client will see read data
958 * that reflects the state of the file *after* performing the
959 * following compound.
960 *
961 * To ensure proper ordering, we therefore turn off zero copy if
962 * the client wants us to do more in this compound:
963 */
964 if (!nfsd4_last_compound_op(rqstp)) {
965 struct nfsd4_compoundargs *argp = rqstp->rq_argp;
966
967 argp->splice_ok = false;
968 }
969
970 /* check stateid */
971 status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
972 &read->rd_stateid, RD_STATE,
973 &read->rd_nf, NULL);
974
975 read->rd_rqstp = rqstp;
976 read->rd_fhp = &cstate->current_fh;
977 return status;
978 }
979
980
981 static void
982 nfsd4_read_release(union nfsd4_op_u *u)
983 {
984 if (u->read.rd_nf)
985 nfsd_file_put(u->read.rd_nf);
986 trace_nfsd_read_done(u->read.rd_rqstp, u->read.rd_fhp,
987 u->read.rd_offset, u->read.rd_length);
988 }
989
990 static __be32
991 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
992 union nfsd4_op_u *u)
993 {
994 struct nfsd4_readdir *readdir = &u->readdir;
995 u64 cookie = readdir->rd_cookie;
996 static const nfs4_verifier zeroverf;
997
998 /* no need to check permission - this will be done in nfsd_readdir() */
999
1000 if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
1001 return nfserr_inval;
1002
1003 readdir->rd_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
1004 readdir->rd_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
1005 readdir->rd_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
1006
1007 if ((cookie == 1) || (cookie == 2) ||
1008 (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
1009 return nfserr_bad_cookie;
1010
1011 readdir->rd_rqstp = rqstp;
1012 readdir->rd_fhp = &cstate->current_fh;
1013 return nfs_ok;
1014 }
1015
1016 static __be32
1017 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1018 union nfsd4_op_u *u)
1019 {
1020 u->readlink.rl_rqstp = rqstp;
1021 u->readlink.rl_fhp = &cstate->current_fh;
1022 return nfs_ok;
1023 }
1024
1025 static __be32
1026 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1027 union nfsd4_op_u *u)
1028 {
1029 struct nfsd4_remove *remove = &u->remove;
1030 __be32 status;
1031
1032 if (opens_in_grace(SVC_NET(rqstp)))
1033 return nfserr_grace;
1034 status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
1035 remove->rm_name, remove->rm_namelen);
1036 if (!status)
1037 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
1038 return status;
1039 }
1040
1041 static __be32
1042 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1043 union nfsd4_op_u *u)
1044 {
1045 struct nfsd4_rename *rename = &u->rename;
1046 __be32 status;
1047
1048 if (opens_in_grace(SVC_NET(rqstp)))
1049 return nfserr_grace;
1050 status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
1051 rename->rn_snamelen, &cstate->current_fh,
1052 rename->rn_tname, rename->rn_tnamelen);
1053 if (status)
1054 return status;
1055 set_change_info(&rename->rn_sinfo, &cstate->save_fh);
1056 set_change_info(&rename->rn_tinfo, &cstate->current_fh);
1057 return nfs_ok;
1058 }
1059
1060 static __be32
1061 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1062 union nfsd4_op_u *u)
1063 {
1064 struct nfsd4_secinfo *secinfo = &u->secinfo;
1065 struct svc_export *exp;
1066 struct dentry *dentry;
1067 __be32 err;
1068
1069 err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
1070 if (err)
1071 return err;
1072 err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
1073 secinfo->si_name, secinfo->si_namelen,
1074 &exp, &dentry);
1075 if (err)
1076 return err;
1077 if (d_really_is_negative(dentry)) {
1078 exp_put(exp);
1079 err = nfserr_noent;
1080 } else
1081 secinfo->si_exp = exp;
1082 dput(dentry);
1083 if (cstate->minorversion)
1084 /* See rfc 5661 section 2.6.3.1.1.8 */
1085 fh_put(&cstate->current_fh);
1086 return err;
1087 }
1088
1089 static __be32
1090 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1091 union nfsd4_op_u *u)
1092 {
1093 __be32 err;
1094
1095 switch (u->secinfo_no_name.sin_style) {
1096 case NFS4_SECINFO_STYLE4_CURRENT_FH:
1097 break;
1098 case NFS4_SECINFO_STYLE4_PARENT:
1099 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
1100 if (err)
1101 return err;
1102 break;
1103 default:
1104 return nfserr_inval;
1105 }
1106
1107 u->secinfo_no_name.sin_exp = exp_get(cstate->current_fh.fh_export);
1108 fh_put(&cstate->current_fh);
1109 return nfs_ok;
1110 }
1111
1112 static void
1113 nfsd4_secinfo_release(union nfsd4_op_u *u)
1114 {
1115 if (u->secinfo.si_exp)
1116 exp_put(u->secinfo.si_exp);
1117 }
1118
1119 static void
1120 nfsd4_secinfo_no_name_release(union nfsd4_op_u *u)
1121 {
1122 if (u->secinfo_no_name.sin_exp)
1123 exp_put(u->secinfo_no_name.sin_exp);
1124 }
1125
1126 static __be32
1127 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1128 union nfsd4_op_u *u)
1129 {
1130 struct nfsd4_setattr *setattr = &u->setattr;
1131 struct nfsd_attrs attrs = {
1132 .na_iattr = &setattr->sa_iattr,
1133 .na_seclabel = &setattr->sa_label,
1134 };
1135 struct inode *inode;
1136 __be32 status = nfs_ok;
1137 bool save_no_wcc;
1138 int err;
1139
1140 if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
1141 status = nfs4_preprocess_stateid_op(rqstp, cstate,
1142 &cstate->current_fh, &setattr->sa_stateid,
1143 WR_STATE, NULL, NULL);
1144 if (status)
1145 return status;
1146 }
1147 err = fh_want_write(&cstate->current_fh);
1148 if (err)
1149 return nfserrno(err);
1150 status = nfs_ok;
1151
1152 status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
1153 nfsd_attrmask);
1154 if (status)
1155 goto out;
1156
1157 inode = cstate->current_fh.fh_dentry->d_inode;
1158 status = nfsd4_acl_to_attr(S_ISDIR(inode->i_mode) ? NF4DIR : NF4REG,
1159 setattr->sa_acl, &attrs);
1160
1161 if (status)
1162 goto out;
1163 save_no_wcc = cstate->current_fh.fh_no_wcc;
1164 cstate->current_fh.fh_no_wcc = true;
1165 status = nfsd_setattr(rqstp, &cstate->current_fh, &attrs, NULL);
1166 cstate->current_fh.fh_no_wcc = save_no_wcc;
1167 if (!status)
1168 status = nfserrno(attrs.na_labelerr);
1169 if (!status)
1170 status = nfserrno(attrs.na_aclerr);
1171 out:
1172 nfsd_attrs_free(&attrs);
1173 fh_drop_write(&cstate->current_fh);
1174 return status;
1175 }
1176
1177 static __be32
1178 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1179 union nfsd4_op_u *u)
1180 {
1181 struct nfsd4_write *write = &u->write;
1182 stateid_t *stateid = &write->wr_stateid;
1183 struct nfsd_file *nf = NULL;
1184 __be32 status = nfs_ok;
1185 unsigned long cnt;
1186 int nvecs;
1187
1188 if (write->wr_offset > (u64)OFFSET_MAX ||
1189 write->wr_offset + write->wr_buflen > (u64)OFFSET_MAX)
1190 return nfserr_fbig;
1191
1192 cnt = write->wr_buflen;
1193 trace_nfsd_write_start(rqstp, &cstate->current_fh,
1194 write->wr_offset, cnt);
1195 status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1196 stateid, WR_STATE, &nf, NULL);
1197 if (status)
1198 return status;
1199
1200 write->wr_how_written = write->wr_stable_how;
1201
1202 nvecs = svc_fill_write_vector(rqstp, &write->wr_payload);
1203 WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1204
1205 status = nfsd_vfs_write(rqstp, &cstate->current_fh, nf,
1206 write->wr_offset, rqstp->rq_vec, nvecs, &cnt,
1207 write->wr_how_written,
1208 (__be32 *)write->wr_verifier.data);
1209 nfsd_file_put(nf);
1210
1211 write->wr_bytes_written = cnt;
1212 trace_nfsd_write_done(rqstp, &cstate->current_fh,
1213 write->wr_offset, cnt);
1214 return status;
1215 }
1216
1217 static __be32
1218 nfsd4_verify_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1219 stateid_t *src_stateid, struct nfsd_file **src,
1220 stateid_t *dst_stateid, struct nfsd_file **dst)
1221 {
1222 __be32 status;
1223
1224 if (!cstate->save_fh.fh_dentry)
1225 return nfserr_nofilehandle;
1226
1227 status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->save_fh,
1228 src_stateid, RD_STATE, src, NULL);
1229 if (status)
1230 goto out;
1231
1232 status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1233 dst_stateid, WR_STATE, dst, NULL);
1234 if (status)
1235 goto out_put_src;
1236
1237 /* fix up for NFS-specific error code */
1238 if (!S_ISREG(file_inode((*src)->nf_file)->i_mode) ||
1239 !S_ISREG(file_inode((*dst)->nf_file)->i_mode)) {
1240 status = nfserr_wrong_type;
1241 goto out_put_dst;
1242 }
1243
1244 out:
1245 return status;
1246 out_put_dst:
1247 nfsd_file_put(*dst);
1248 *dst = NULL;
1249 out_put_src:
1250 nfsd_file_put(*src);
1251 *src = NULL;
1252 goto out;
1253 }
1254
1255 static __be32
1256 nfsd4_clone(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1257 union nfsd4_op_u *u)
1258 {
1259 struct nfsd4_clone *clone = &u->clone;
1260 struct nfsd_file *src, *dst;
1261 __be32 status;
1262
1263 status = nfsd4_verify_copy(rqstp, cstate, &clone->cl_src_stateid, &src,
1264 &clone->cl_dst_stateid, &dst);
1265 if (status)
1266 goto out;
1267
1268 status = nfsd4_clone_file_range(rqstp, src, clone->cl_src_pos,
1269 dst, clone->cl_dst_pos, clone->cl_count,
1270 EX_ISSYNC(cstate->current_fh.fh_export));
1271
1272 nfsd_file_put(dst);
1273 nfsd_file_put(src);
1274 out:
1275 return status;
1276 }
1277
1278 static void nfs4_put_copy(struct nfsd4_copy *copy)
1279 {
1280 if (!refcount_dec_and_test(©->refcount))
1281 return;
1282 atomic_dec(©->cp_nn->pending_async_copies);
1283 kfree(copy->cp_src);
1284 kfree(copy);
1285 }
1286
1287 static void nfsd4_stop_copy(struct nfsd4_copy *copy)
1288 {
1289 if (!test_and_set_bit(NFSD4_COPY_F_STOPPED, ©->cp_flags))
1290 kthread_stop(copy->copy_task);
1291 nfs4_put_copy(copy);
1292 }
1293
1294 static struct nfsd4_copy *nfsd4_get_copy(struct nfs4_client *clp)
1295 {
1296 struct nfsd4_copy *copy = NULL;
1297
1298 spin_lock(&clp->async_lock);
1299 if (!list_empty(&clp->async_copies)) {
1300 copy = list_first_entry(&clp->async_copies, struct nfsd4_copy,
1301 copies);
1302 refcount_inc(©->refcount);
1303 }
1304 spin_unlock(&clp->async_lock);
1305 return copy;
1306 }
1307
1308 void nfsd4_shutdown_copy(struct nfs4_client *clp)
1309 {
1310 struct nfsd4_copy *copy;
1311
1312 while ((copy = nfsd4_get_copy(clp)) != NULL)
1313 nfsd4_stop_copy(copy);
1314 }
1315 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
1316
1317 extern struct file *nfs42_ssc_open(struct vfsmount *ss_mnt,
1318 struct nfs_fh *src_fh,
1319 nfs4_stateid *stateid);
1320 extern void nfs42_ssc_close(struct file *filep);
1321
1322 extern void nfs_sb_deactive(struct super_block *sb);
1323
1324 #define NFSD42_INTERSSC_MOUNTOPS "vers=4.2,addr=%s,sec=sys"
1325
1326 /*
1327 * setup a work entry in the ssc delayed unmount list.
1328 */
1329 static __be32 nfsd4_ssc_setup_dul(struct nfsd_net *nn, char *ipaddr,
1330 struct nfsd4_ssc_umount_item **nsui,
1331 struct svc_rqst *rqstp)
1332 {
1333 struct nfsd4_ssc_umount_item *ni = NULL;
1334 struct nfsd4_ssc_umount_item *work = NULL;
1335 struct nfsd4_ssc_umount_item *tmp;
1336 DEFINE_WAIT(wait);
1337 __be32 status = 0;
1338
1339 *nsui = NULL;
1340 work = kzalloc(sizeof(*work), GFP_KERNEL);
1341 try_again:
1342 spin_lock(&nn->nfsd_ssc_lock);
1343 list_for_each_entry_safe(ni, tmp, &nn->nfsd_ssc_mount_list, nsui_list) {
1344 if (strncmp(ni->nsui_ipaddr, ipaddr, sizeof(ni->nsui_ipaddr)))
1345 continue;
1346 /* found a match */
1347 if (ni->nsui_busy) {
1348 /* wait - and try again */
1349 prepare_to_wait(&nn->nfsd_ssc_waitq, &wait, TASK_IDLE);
1350 spin_unlock(&nn->nfsd_ssc_lock);
1351
1352 /* allow 20secs for mount/unmount for now - revisit */
1353 if (svc_thread_should_stop(rqstp) ||
1354 (schedule_timeout(20*HZ) == 0)) {
1355 finish_wait(&nn->nfsd_ssc_waitq, &wait);
1356 kfree(work);
1357 return nfserr_eagain;
1358 }
1359 finish_wait(&nn->nfsd_ssc_waitq, &wait);
1360 goto try_again;
1361 }
1362 *nsui = ni;
1363 refcount_inc(&ni->nsui_refcnt);
1364 spin_unlock(&nn->nfsd_ssc_lock);
1365 kfree(work);
1366
1367 /* return vfsmount in (*nsui)->nsui_vfsmount */
1368 return 0;
1369 }
1370 if (work) {
1371 strscpy(work->nsui_ipaddr, ipaddr, sizeof(work->nsui_ipaddr) - 1);
1372 refcount_set(&work->nsui_refcnt, 2);
1373 work->nsui_busy = true;
1374 list_add_tail(&work->nsui_list, &nn->nfsd_ssc_mount_list);
1375 *nsui = work;
1376 } else
1377 status = nfserr_resource;
1378 spin_unlock(&nn->nfsd_ssc_lock);
1379 return status;
1380 }
1381
1382 static void nfsd4_ssc_update_dul(struct nfsd_net *nn,
1383 struct nfsd4_ssc_umount_item *nsui,
1384 struct vfsmount *ss_mnt)
1385 {
1386 spin_lock(&nn->nfsd_ssc_lock);
1387 nsui->nsui_vfsmount = ss_mnt;
1388 nsui->nsui_busy = false;
1389 wake_up_all(&nn->nfsd_ssc_waitq);
1390 spin_unlock(&nn->nfsd_ssc_lock);
1391 }
1392
1393 static void nfsd4_ssc_cancel_dul(struct nfsd_net *nn,
1394 struct nfsd4_ssc_umount_item *nsui)
1395 {
1396 spin_lock(&nn->nfsd_ssc_lock);
1397 list_del(&nsui->nsui_list);
1398 wake_up_all(&nn->nfsd_ssc_waitq);
1399 spin_unlock(&nn->nfsd_ssc_lock);
1400 kfree(nsui);
1401 }
1402
1403 /*
1404 * Support one copy source server for now.
1405 */
1406 static __be32
1407 nfsd4_interssc_connect(struct nl4_server *nss, struct svc_rqst *rqstp,
1408 struct nfsd4_ssc_umount_item **nsui)
1409 {
1410 struct file_system_type *type;
1411 struct vfsmount *ss_mnt;
1412 struct nfs42_netaddr *naddr;
1413 struct sockaddr_storage tmp_addr;
1414 size_t tmp_addrlen, match_netid_len = 3;
1415 char *startsep = "", *endsep = "", *match_netid = "tcp";
1416 char *ipaddr, *dev_name, *raw_data;
1417 int len, raw_len;
1418 __be32 status = nfserr_inval;
1419 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1420
1421 naddr = &nss->u.nl4_addr;
1422 tmp_addrlen = rpc_uaddr2sockaddr(SVC_NET(rqstp), naddr->addr,
1423 naddr->addr_len,
1424 (struct sockaddr *)&tmp_addr,
1425 sizeof(tmp_addr));
1426 *nsui = NULL;
1427 if (tmp_addrlen == 0)
1428 goto out_err;
1429
1430 if (tmp_addr.ss_family == AF_INET6) {
1431 startsep = "[";
1432 endsep = "]";
1433 match_netid = "tcp6";
1434 match_netid_len = 4;
1435 }
1436
1437 if (naddr->netid_len != match_netid_len ||
1438 strncmp(naddr->netid, match_netid, naddr->netid_len))
1439 goto out_err;
1440
1441 /* Construct the raw data for the vfs_kern_mount call */
1442 len = RPC_MAX_ADDRBUFLEN + 1;
1443 ipaddr = kzalloc(len, GFP_KERNEL);
1444 if (!ipaddr)
1445 goto out_err;
1446
1447 rpc_ntop((struct sockaddr *)&tmp_addr, ipaddr, len);
1448
1449 /* 2 for ipv6 endsep and startsep. 3 for ":/" and trailing '/0'*/
1450
1451 raw_len = strlen(NFSD42_INTERSSC_MOUNTOPS) + strlen(ipaddr);
1452 raw_data = kzalloc(raw_len, GFP_KERNEL);
1453 if (!raw_data)
1454 goto out_free_ipaddr;
1455
1456 snprintf(raw_data, raw_len, NFSD42_INTERSSC_MOUNTOPS, ipaddr);
1457
1458 status = nfserr_nodev;
1459 type = get_fs_type("nfs");
1460 if (!type)
1461 goto out_free_rawdata;
1462
1463 /* Set the server:<export> for the vfs_kern_mount call */
1464 dev_name = kzalloc(len + 5, GFP_KERNEL);
1465 if (!dev_name)
1466 goto out_free_rawdata;
1467 snprintf(dev_name, len + 5, "%s%s%s:/", startsep, ipaddr, endsep);
1468
1469 status = nfsd4_ssc_setup_dul(nn, ipaddr, nsui, rqstp);
1470 if (status)
1471 goto out_free_devname;
1472 if ((*nsui)->nsui_vfsmount)
1473 goto out_done;
1474
1475 /* Use an 'internal' mount: SB_KERNMOUNT -> MNT_INTERNAL */
1476 ss_mnt = vfs_kern_mount(type, SB_KERNMOUNT, dev_name, raw_data);
1477 module_put(type->owner);
1478 if (IS_ERR(ss_mnt)) {
1479 status = nfserr_nodev;
1480 nfsd4_ssc_cancel_dul(nn, *nsui);
1481 goto out_free_devname;
1482 }
1483 nfsd4_ssc_update_dul(nn, *nsui, ss_mnt);
1484 out_done:
1485 status = 0;
1486
1487 out_free_devname:
1488 kfree(dev_name);
1489 out_free_rawdata:
1490 kfree(raw_data);
1491 out_free_ipaddr:
1492 kfree(ipaddr);
1493 out_err:
1494 return status;
1495 }
1496
1497 /*
1498 * Verify COPY destination stateid.
1499 *
1500 * Connect to the source server with NFSv4.1.
1501 * Create the source struct file for nfsd_copy_range.
1502 * Called with COPY cstate:
1503 * SAVED_FH: source filehandle
1504 * CURRENT_FH: destination filehandle
1505 */
1506 static __be32
1507 nfsd4_setup_inter_ssc(struct svc_rqst *rqstp,
1508 struct nfsd4_compound_state *cstate,
1509 struct nfsd4_copy *copy)
1510 {
1511 struct svc_fh *s_fh = NULL;
1512 stateid_t *s_stid = ©->cp_src_stateid;
1513 __be32 status = nfserr_inval;
1514
1515 /* Verify the destination stateid and set dst struct file*/
1516 status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1517 ©->cp_dst_stateid,
1518 WR_STATE, ©->nf_dst, NULL);
1519 if (status)
1520 goto out;
1521
1522 status = nfsd4_interssc_connect(copy->cp_src, rqstp, ©->ss_nsui);
1523 if (status)
1524 goto out;
1525
1526 s_fh = &cstate->save_fh;
1527
1528 copy->c_fh.size = s_fh->fh_handle.fh_size;
1529 memcpy(copy->c_fh.data, &s_fh->fh_handle.fh_raw, copy->c_fh.size);
1530 copy->stateid.seqid = cpu_to_be32(s_stid->si_generation);
1531 memcpy(copy->stateid.other, (void *)&s_stid->si_opaque,
1532 sizeof(stateid_opaque_t));
1533
1534 status = 0;
1535 out:
1536 return status;
1537 }
1538
1539 static void
1540 nfsd4_cleanup_inter_ssc(struct nfsd4_ssc_umount_item *nsui, struct file *filp,
1541 struct nfsd_file *dst)
1542 {
1543 struct nfsd_net *nn = net_generic(dst->nf_net, nfsd_net_id);
1544 long timeout = msecs_to_jiffies(nfsd4_ssc_umount_timeout);
1545
1546 nfs42_ssc_close(filp);
1547 fput(filp);
1548
1549 spin_lock(&nn->nfsd_ssc_lock);
1550 list_del(&nsui->nsui_list);
1551 /*
1552 * vfsmount can be shared by multiple exports,
1553 * decrement refcnt. If the count drops to 1 it
1554 * will be unmounted when nsui_expire expires.
1555 */
1556 refcount_dec(&nsui->nsui_refcnt);
1557 nsui->nsui_expire = jiffies + timeout;
1558 list_add_tail(&nsui->nsui_list, &nn->nfsd_ssc_mount_list);
1559 spin_unlock(&nn->nfsd_ssc_lock);
1560 }
1561
1562 #else /* CONFIG_NFSD_V4_2_INTER_SSC */
1563
1564 static __be32
1565 nfsd4_setup_inter_ssc(struct svc_rqst *rqstp,
1566 struct nfsd4_compound_state *cstate,
1567 struct nfsd4_copy *copy)
1568 {
1569 return nfserr_inval;
1570 }
1571
1572 static void
1573 nfsd4_cleanup_inter_ssc(struct nfsd4_ssc_umount_item *nsui, struct file *filp,
1574 struct nfsd_file *dst)
1575 {
1576 }
1577
1578 static struct file *nfs42_ssc_open(struct vfsmount *ss_mnt,
1579 struct nfs_fh *src_fh,
1580 nfs4_stateid *stateid)
1581 {
1582 return NULL;
1583 }
1584 #endif /* CONFIG_NFSD_V4_2_INTER_SSC */
1585
1586 static __be32
1587 nfsd4_setup_intra_ssc(struct svc_rqst *rqstp,
1588 struct nfsd4_compound_state *cstate,
1589 struct nfsd4_copy *copy)
1590 {
1591 return nfsd4_verify_copy(rqstp, cstate, ©->cp_src_stateid,
1592 ©->nf_src, ©->cp_dst_stateid,
1593 ©->nf_dst);
1594 }
1595
1596 static void nfsd4_cb_offload_release(struct nfsd4_callback *cb)
1597 {
1598 struct nfsd4_cb_offload *cbo =
1599 container_of(cb, struct nfsd4_cb_offload, co_cb);
1600
1601 kfree(cbo);
1602 }
1603
1604 static int nfsd4_cb_offload_done(struct nfsd4_callback *cb,
1605 struct rpc_task *task)
1606 {
1607 struct nfsd4_cb_offload *cbo =
1608 container_of(cb, struct nfsd4_cb_offload, co_cb);
1609
1610 trace_nfsd_cb_offload_done(&cbo->co_res.cb_stateid, task);
1611 return 1;
1612 }
1613
1614 static const struct nfsd4_callback_ops nfsd4_cb_offload_ops = {
1615 .release = nfsd4_cb_offload_release,
1616 .done = nfsd4_cb_offload_done
1617 };
1618
1619 static void nfsd4_init_copy_res(struct nfsd4_copy *copy, bool sync)
1620 {
1621 copy->cp_res.wr_stable_how =
1622 test_bit(NFSD4_COPY_F_COMMITTED, ©->cp_flags) ?
1623 NFS_FILE_SYNC : NFS_UNSTABLE;
1624 nfsd4_copy_set_sync(copy, sync);
1625 }
1626
1627 static ssize_t _nfsd_copy_file_range(struct nfsd4_copy *copy,
1628 struct file *dst,
1629 struct file *src)
1630 {
1631 errseq_t since;
1632 ssize_t bytes_copied = 0;
1633 u64 bytes_total = copy->cp_count;
1634 u64 src_pos = copy->cp_src_pos;
1635 u64 dst_pos = copy->cp_dst_pos;
1636 int status;
1637 loff_t end;
1638
1639 /* See RFC 7862 p.67: */
1640 if (bytes_total == 0)
1641 bytes_total = ULLONG_MAX;
1642 do {
1643 /* Only async copies can be stopped here */
1644 if (kthread_should_stop())
1645 break;
1646 bytes_copied = nfsd_copy_file_range(src, src_pos, dst, dst_pos,
1647 bytes_total);
1648 if (bytes_copied <= 0)
1649 break;
1650 bytes_total -= bytes_copied;
1651 copy->cp_res.wr_bytes_written += bytes_copied;
1652 src_pos += bytes_copied;
1653 dst_pos += bytes_copied;
1654 } while (bytes_total > 0 && nfsd4_copy_is_async(copy));
1655 /* for a non-zero asynchronous copy do a commit of data */
1656 if (nfsd4_copy_is_async(copy) && copy->cp_res.wr_bytes_written > 0) {
1657 since = READ_ONCE(dst->f_wb_err);
1658 end = copy->cp_dst_pos + copy->cp_res.wr_bytes_written - 1;
1659 status = vfs_fsync_range(dst, copy->cp_dst_pos, end, 0);
1660 if (!status)
1661 status = filemap_check_wb_err(dst->f_mapping, since);
1662 if (!status)
1663 set_bit(NFSD4_COPY_F_COMMITTED, ©->cp_flags);
1664 }
1665 return bytes_copied;
1666 }
1667
1668 static __be32 nfsd4_do_copy(struct nfsd4_copy *copy,
1669 struct file *src, struct file *dst,
1670 bool sync)
1671 {
1672 __be32 status;
1673 ssize_t bytes;
1674
1675 bytes = _nfsd_copy_file_range(copy, dst, src);
1676
1677 /* for async copy, we ignore the error, client can always retry
1678 * to get the error
1679 */
1680 if (bytes < 0 && !copy->cp_res.wr_bytes_written)
1681 status = nfserrno(bytes);
1682 else {
1683 nfsd4_init_copy_res(copy, sync);
1684 status = nfs_ok;
1685 }
1686 return status;
1687 }
1688
1689 static void dup_copy_fields(struct nfsd4_copy *src, struct nfsd4_copy *dst)
1690 {
1691 dst->cp_src_pos = src->cp_src_pos;
1692 dst->cp_dst_pos = src->cp_dst_pos;
1693 dst->cp_count = src->cp_count;
1694 dst->cp_flags = src->cp_flags;
1695 memcpy(&dst->cp_res, &src->cp_res, sizeof(src->cp_res));
1696 memcpy(&dst->fh, &src->fh, sizeof(src->fh));
1697 dst->cp_clp = src->cp_clp;
1698 dst->nf_dst = nfsd_file_get(src->nf_dst);
1699 /* for inter, nf_src doesn't exist yet */
1700 if (!nfsd4_ssc_is_inter(src))
1701 dst->nf_src = nfsd_file_get(src->nf_src);
1702
1703 memcpy(&dst->cp_stateid, &src->cp_stateid, sizeof(src->cp_stateid));
1704 memcpy(dst->cp_src, src->cp_src, sizeof(struct nl4_server));
1705 memcpy(&dst->stateid, &src->stateid, sizeof(src->stateid));
1706 memcpy(&dst->c_fh, &src->c_fh, sizeof(src->c_fh));
1707 dst->ss_nsui = src->ss_nsui;
1708 }
1709
1710 static void release_copy_files(struct nfsd4_copy *copy)
1711 {
1712 if (copy->nf_src)
1713 nfsd_file_put(copy->nf_src);
1714 if (copy->nf_dst)
1715 nfsd_file_put(copy->nf_dst);
1716 }
1717
1718 static void cleanup_async_copy(struct nfsd4_copy *copy)
1719 {
1720 nfs4_free_copy_state(copy);
1721 release_copy_files(copy);
1722 if (copy->cp_clp) {
1723 spin_lock(©->cp_clp->async_lock);
1724 if (!list_empty(©->copies))
1725 list_del_init(©->copies);
1726 spin_unlock(©->cp_clp->async_lock);
1727 }
1728 nfs4_put_copy(copy);
1729 }
1730
1731 static void nfsd4_send_cb_offload(struct nfsd4_copy *copy)
1732 {
1733 struct nfsd4_cb_offload *cbo;
1734
1735 cbo = kzalloc(sizeof(*cbo), GFP_KERNEL);
1736 if (!cbo)
1737 return;
1738
1739 memcpy(&cbo->co_res, ©->cp_res, sizeof(copy->cp_res));
1740 memcpy(&cbo->co_fh, ©->fh, sizeof(copy->fh));
1741 cbo->co_nfserr = copy->nfserr;
1742
1743 nfsd4_init_cb(&cbo->co_cb, copy->cp_clp, &nfsd4_cb_offload_ops,
1744 NFSPROC4_CLNT_CB_OFFLOAD);
1745 trace_nfsd_cb_offload(copy->cp_clp, &cbo->co_res.cb_stateid,
1746 &cbo->co_fh, copy->cp_count, copy->nfserr);
1747 nfsd4_run_cb(&cbo->co_cb);
1748 }
1749
1750 /**
1751 * nfsd4_do_async_copy - kthread function for background server-side COPY
1752 * @data: arguments for COPY operation
1753 *
1754 * Return values:
1755 * %0: Copy operation is done.
1756 */
1757 static int nfsd4_do_async_copy(void *data)
1758 {
1759 struct nfsd4_copy *copy = (struct nfsd4_copy *)data;
1760
1761 trace_nfsd_copy_do_async(copy);
1762 if (nfsd4_ssc_is_inter(copy)) {
1763 struct file *filp;
1764
1765 filp = nfs42_ssc_open(copy->ss_nsui->nsui_vfsmount,
1766 ©->c_fh, ©->stateid);
1767 if (IS_ERR(filp)) {
1768 switch (PTR_ERR(filp)) {
1769 case -EBADF:
1770 copy->nfserr = nfserr_wrong_type;
1771 break;
1772 default:
1773 copy->nfserr = nfserr_offload_denied;
1774 }
1775 /* ss_mnt will be unmounted by the laundromat */
1776 goto do_callback;
1777 }
1778 copy->nfserr = nfsd4_do_copy(copy, filp, copy->nf_dst->nf_file,
1779 false);
1780 nfsd4_cleanup_inter_ssc(copy->ss_nsui, filp, copy->nf_dst);
1781 } else {
1782 copy->nfserr = nfsd4_do_copy(copy, copy->nf_src->nf_file,
1783 copy->nf_dst->nf_file, false);
1784 }
1785
1786 do_callback:
1787 set_bit(NFSD4_COPY_F_COMPLETED, ©->cp_flags);
1788 nfsd4_send_cb_offload(copy);
1789 cleanup_async_copy(copy);
1790 return 0;
1791 }
1792
1793 static __be32
1794 nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1795 union nfsd4_op_u *u)
1796 {
1797 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1798 struct nfsd4_copy *async_copy = NULL;
1799 struct nfsd4_copy *copy = &u->copy;
1800 struct nfsd42_write_res *result;
1801 __be32 status;
1802
1803 /*
1804 * Currently, async COPY is not reliable. Force all COPY
1805 * requests to be synchronous to avoid client application
1806 * hangs waiting for COPY completion.
1807 */
1808 nfsd4_copy_set_sync(copy, true);
1809
1810 result = ©->cp_res;
1811 nfsd_copy_write_verifier((__be32 *)&result->wr_verifier.data, nn);
1812
1813 copy->cp_clp = cstate->clp;
1814 if (nfsd4_ssc_is_inter(copy)) {
1815 trace_nfsd_copy_inter(copy);
1816 if (!inter_copy_offload_enable || nfsd4_copy_is_sync(copy)) {
1817 status = nfserr_notsupp;
1818 goto out;
1819 }
1820 status = nfsd4_setup_inter_ssc(rqstp, cstate, copy);
1821 if (status) {
1822 trace_nfsd_copy_done(copy, status);
1823 return nfserr_offload_denied;
1824 }
1825 } else {
1826 trace_nfsd_copy_intra(copy);
1827 status = nfsd4_setup_intra_ssc(rqstp, cstate, copy);
1828 if (status) {
1829 trace_nfsd_copy_done(copy, status);
1830 return status;
1831 }
1832 }
1833
1834 memcpy(©->fh, &cstate->current_fh.fh_handle,
1835 sizeof(struct knfsd_fh));
1836 if (nfsd4_copy_is_async(copy)) {
1837 async_copy = kzalloc(sizeof(struct nfsd4_copy), GFP_KERNEL);
1838 if (!async_copy)
1839 goto out_err;
1840 async_copy->cp_nn = nn;
1841 /* Arbitrary cap on number of pending async copy operations */
1842 if (atomic_inc_return(&nn->pending_async_copies) >
1843 (int)rqstp->rq_pool->sp_nrthreads) {
1844 atomic_dec(&nn->pending_async_copies);
1845 goto out_err;
1846 }
1847 INIT_LIST_HEAD(&async_copy->copies);
1848 refcount_set(&async_copy->refcount, 1);
1849 async_copy->cp_src = kmalloc(sizeof(*async_copy->cp_src), GFP_KERNEL);
1850 if (!async_copy->cp_src)
1851 goto out_err;
1852 if (!nfs4_init_copy_state(nn, copy))
1853 goto out_err;
1854 memcpy(&result->cb_stateid, ©->cp_stateid.cs_stid,
1855 sizeof(result->cb_stateid));
1856 dup_copy_fields(copy, async_copy);
1857 async_copy->copy_task = kthread_create(nfsd4_do_async_copy,
1858 async_copy, "%s", "copy thread");
1859 if (IS_ERR(async_copy->copy_task))
1860 goto out_err;
1861 spin_lock(&async_copy->cp_clp->async_lock);
1862 list_add(&async_copy->copies,
1863 &async_copy->cp_clp->async_copies);
1864 spin_unlock(&async_copy->cp_clp->async_lock);
1865 wake_up_process(async_copy->copy_task);
1866 status = nfs_ok;
1867 } else {
1868 status = nfsd4_do_copy(copy, copy->nf_src->nf_file,
1869 copy->nf_dst->nf_file, true);
1870 }
1871 out:
1872 trace_nfsd_copy_done(copy, status);
1873 release_copy_files(copy);
1874 return status;
1875 out_err:
1876 if (nfsd4_ssc_is_inter(copy)) {
1877 /*
1878 * Source's vfsmount of inter-copy will be unmounted
1879 * by the laundromat. Use copy instead of async_copy
1880 * since async_copy->ss_nsui might not be set yet.
1881 */
1882 refcount_dec(©->ss_nsui->nsui_refcnt);
1883 }
1884 if (async_copy)
1885 cleanup_async_copy(async_copy);
1886 status = nfserr_jukebox;
1887 goto out;
1888 }
1889
1890 static struct nfsd4_copy *
1891 find_async_copy_locked(struct nfs4_client *clp, stateid_t *stateid)
1892 {
1893 struct nfsd4_copy *copy;
1894
1895 lockdep_assert_held(&clp->async_lock);
1896
1897 list_for_each_entry(copy, &clp->async_copies, copies) {
1898 if (memcmp(©->cp_stateid.cs_stid, stateid, NFS4_STATEID_SIZE))
1899 continue;
1900 return copy;
1901 }
1902 return NULL;
1903 }
1904
1905 static struct nfsd4_copy *
1906 find_async_copy(struct nfs4_client *clp, stateid_t *stateid)
1907 {
1908 struct nfsd4_copy *copy;
1909
1910 spin_lock(&clp->async_lock);
1911 copy = find_async_copy_locked(clp, stateid);
1912 if (copy)
1913 refcount_inc(©->refcount);
1914 spin_unlock(&clp->async_lock);
1915 return copy;
1916 }
1917
1918 static __be32
1919 nfsd4_offload_cancel(struct svc_rqst *rqstp,
1920 struct nfsd4_compound_state *cstate,
1921 union nfsd4_op_u *u)
1922 {
1923 struct nfsd4_offload_status *os = &u->offload_status;
1924 struct nfsd4_copy *copy;
1925 struct nfs4_client *clp = cstate->clp;
1926
1927 copy = find_async_copy(clp, &os->stateid);
1928 if (!copy) {
1929 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1930
1931 return manage_cpntf_state(nn, &os->stateid, clp, NULL);
1932 } else
1933 nfsd4_stop_copy(copy);
1934
1935 return nfs_ok;
1936 }
1937
1938 static __be32
1939 nfsd4_copy_notify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1940 union nfsd4_op_u *u)
1941 {
1942 struct nfsd4_copy_notify *cn = &u->copy_notify;
1943 __be32 status;
1944 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1945 struct nfs4_stid *stid;
1946 struct nfs4_cpntf_state *cps;
1947 struct nfs4_client *clp = cstate->clp;
1948
1949 status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1950 &cn->cpn_src_stateid, RD_STATE, NULL,
1951 &stid);
1952 if (status)
1953 return status;
1954
1955 cn->cpn_lease_time.tv_sec = nn->nfsd4_lease;
1956 cn->cpn_lease_time.tv_nsec = 0;
1957
1958 status = nfserrno(-ENOMEM);
1959 cps = nfs4_alloc_init_cpntf_state(nn, stid);
1960 if (!cps)
1961 goto out;
1962 memcpy(&cn->cpn_cnr_stateid, &cps->cp_stateid.cs_stid, sizeof(stateid_t));
1963 memcpy(&cps->cp_p_stateid, &stid->sc_stateid, sizeof(stateid_t));
1964 memcpy(&cps->cp_p_clid, &clp->cl_clientid, sizeof(clientid_t));
1965
1966 /* For now, only return one server address in cpn_src, the
1967 * address used by the client to connect to this server.
1968 */
1969 cn->cpn_src->nl4_type = NL4_NETADDR;
1970 status = nfsd4_set_netaddr((struct sockaddr *)&rqstp->rq_daddr,
1971 &cn->cpn_src->u.nl4_addr);
1972 WARN_ON_ONCE(status);
1973 if (status) {
1974 nfs4_put_cpntf_state(nn, cps);
1975 goto out;
1976 }
1977 out:
1978 nfs4_put_stid(stid);
1979 return status;
1980 }
1981
1982 static __be32
1983 nfsd4_fallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1984 struct nfsd4_fallocate *fallocate, int flags)
1985 {
1986 __be32 status;
1987 struct nfsd_file *nf;
1988
1989 status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1990 &fallocate->falloc_stateid,
1991 WR_STATE, &nf, NULL);
1992 if (status != nfs_ok)
1993 return status;
1994
1995 status = nfsd4_vfs_fallocate(rqstp, &cstate->current_fh, nf->nf_file,
1996 fallocate->falloc_offset,
1997 fallocate->falloc_length,
1998 flags);
1999 nfsd_file_put(nf);
2000 return status;
2001 }
2002
2003 static __be32
2004 nfsd4_offload_status(struct svc_rqst *rqstp,
2005 struct nfsd4_compound_state *cstate,
2006 union nfsd4_op_u *u)
2007 {
2008 struct nfsd4_offload_status *os = &u->offload_status;
2009 __be32 status = nfs_ok;
2010 struct nfsd4_copy *copy;
2011 struct nfs4_client *clp = cstate->clp;
2012
2013 os->completed = false;
2014 spin_lock(&clp->async_lock);
2015 copy = find_async_copy_locked(clp, &os->stateid);
2016 if (copy) {
2017 os->count = copy->cp_res.wr_bytes_written;
2018 if (test_bit(NFSD4_COPY_F_COMPLETED, ©->cp_flags)) {
2019 os->completed = true;
2020 os->status = copy->nfserr;
2021 }
2022 } else
2023 status = nfserr_bad_stateid;
2024 spin_unlock(&clp->async_lock);
2025
2026 return status;
2027 }
2028
2029 static __be32
2030 nfsd4_allocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2031 union nfsd4_op_u *u)
2032 {
2033 return nfsd4_fallocate(rqstp, cstate, &u->allocate, 0);
2034 }
2035
2036 static __be32
2037 nfsd4_deallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2038 union nfsd4_op_u *u)
2039 {
2040 return nfsd4_fallocate(rqstp, cstate, &u->deallocate,
2041 FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE);
2042 }
2043
2044 static __be32
2045 nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2046 union nfsd4_op_u *u)
2047 {
2048 struct nfsd4_seek *seek = &u->seek;
2049 int whence;
2050 __be32 status;
2051 struct nfsd_file *nf;
2052
2053 status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
2054 &seek->seek_stateid,
2055 RD_STATE, &nf, NULL);
2056 if (status)
2057 return status;
2058
2059 switch (seek->seek_whence) {
2060 case NFS4_CONTENT_DATA:
2061 whence = SEEK_DATA;
2062 break;
2063 case NFS4_CONTENT_HOLE:
2064 whence = SEEK_HOLE;
2065 break;
2066 default:
2067 status = nfserr_union_notsupp;
2068 goto out;
2069 }
2070
2071 /*
2072 * Note: This call does change file->f_pos, but nothing in NFSD
2073 * should ever file->f_pos.
2074 */
2075 seek->seek_pos = vfs_llseek(nf->nf_file, seek->seek_offset, whence);
2076 if (seek->seek_pos < 0)
2077 status = nfserrno(seek->seek_pos);
2078 else if (seek->seek_pos >= i_size_read(file_inode(nf->nf_file)))
2079 seek->seek_eof = true;
2080
2081 out:
2082 nfsd_file_put(nf);
2083 return status;
2084 }
2085
2086 /* This routine never returns NFS_OK! If there are no other errors, it
2087 * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
2088 * attributes matched. VERIFY is implemented by mapping NFSERR_SAME
2089 * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
2090 */
2091 static __be32
2092 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2093 struct nfsd4_verify *verify)
2094 {
2095 __be32 *buf, *p;
2096 int count;
2097 __be32 status;
2098
2099 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
2100 if (status)
2101 return status;
2102
2103 status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
2104 if (status)
2105 return status;
2106
2107 if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
2108 || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
2109 return nfserr_inval;
2110 if (verify->ve_attrlen & 3)
2111 return nfserr_inval;
2112
2113 /* count in words:
2114 * bitmap_len(1) + bitmap(2) + attr_len(1) = 4
2115 */
2116 count = 4 + (verify->ve_attrlen >> 2);
2117 buf = kmalloc(count << 2, GFP_KERNEL);
2118 if (!buf)
2119 return nfserr_jukebox;
2120
2121 p = buf;
2122 status = nfsd4_encode_fattr_to_buf(&p, count, &cstate->current_fh,
2123 cstate->current_fh.fh_export,
2124 cstate->current_fh.fh_dentry,
2125 verify->ve_bmval,
2126 rqstp, 0);
2127 /*
2128 * If nfsd4_encode_fattr() ran out of space, assume that's because
2129 * the attributes are longer (hence different) than those given:
2130 */
2131 if (status == nfserr_resource)
2132 status = nfserr_not_same;
2133 if (status)
2134 goto out_kfree;
2135
2136 /* skip bitmap */
2137 p = buf + 1 + ntohl(buf[0]);
2138 status = nfserr_not_same;
2139 if (ntohl(*p++) != verify->ve_attrlen)
2140 goto out_kfree;
2141 if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
2142 status = nfserr_same;
2143
2144 out_kfree:
2145 kfree(buf);
2146 return status;
2147 }
2148
2149 static __be32
2150 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2151 union nfsd4_op_u *u)
2152 {
2153 __be32 status;
2154
2155 status = _nfsd4_verify(rqstp, cstate, &u->verify);
2156 return status == nfserr_not_same ? nfs_ok : status;
2157 }
2158
2159 static __be32
2160 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2161 union nfsd4_op_u *u)
2162 {
2163 __be32 status;
2164
2165 status = _nfsd4_verify(rqstp, cstate, &u->nverify);
2166 return status == nfserr_same ? nfs_ok : status;
2167 }
2168
2169 static __be32
2170 nfsd4_get_dir_delegation(struct svc_rqst *rqstp,
2171 struct nfsd4_compound_state *cstate,
2172 union nfsd4_op_u *u)
2173 {
2174 struct nfsd4_get_dir_delegation *gdd = &u->get_dir_delegation;
2175
2176 /*
2177 * RFC 8881, section 18.39.3 says:
2178 *
2179 * "The server may refuse to grant the delegation. In that case, the
2180 * server will return NFS4ERR_DIRDELEG_UNAVAIL."
2181 *
2182 * This is sub-optimal, since it means that the server would need to
2183 * abort compound processing just because the delegation wasn't
2184 * available. RFC8881bis should change this to allow the server to
2185 * return NFS4_OK with a non-fatal status of GDD4_UNAVAIL in this
2186 * situation.
2187 */
2188 gdd->gddrnf_status = GDD4_UNAVAIL;
2189 return nfs_ok;
2190 }
2191
2192 #ifdef CONFIG_NFSD_PNFS
2193 static const struct nfsd4_layout_ops *
2194 nfsd4_layout_verify(struct svc_export *exp, unsigned int layout_type)
2195 {
2196 if (!exp->ex_layout_types) {
2197 dprintk("%s: export does not support pNFS\n", __func__);
2198 return NULL;
2199 }
2200
2201 if (layout_type >= LAYOUT_TYPE_MAX ||
2202 !(exp->ex_layout_types & (1 << layout_type))) {
2203 dprintk("%s: layout type %d not supported\n",
2204 __func__, layout_type);
2205 return NULL;
2206 }
2207
2208 return nfsd4_layout_ops[layout_type];
2209 }
2210
2211 static __be32
2212 nfsd4_getdeviceinfo(struct svc_rqst *rqstp,
2213 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
2214 {
2215 struct nfsd4_getdeviceinfo *gdp = &u->getdeviceinfo;
2216 const struct nfsd4_layout_ops *ops;
2217 struct nfsd4_deviceid_map *map;
2218 struct svc_export *exp;
2219 __be32 nfserr;
2220
2221 dprintk("%s: layout_type %u dev_id [0x%llx:0x%x] maxcnt %u\n",
2222 __func__,
2223 gdp->gd_layout_type,
2224 gdp->gd_devid.fsid_idx, gdp->gd_devid.generation,
2225 gdp->gd_maxcount);
2226
2227 map = nfsd4_find_devid_map(gdp->gd_devid.fsid_idx);
2228 if (!map) {
2229 dprintk("%s: couldn't find device ID to export mapping!\n",
2230 __func__);
2231 return nfserr_noent;
2232 }
2233
2234 exp = rqst_exp_find(rqstp, map->fsid_type, map->fsid);
2235 if (IS_ERR(exp)) {
2236 dprintk("%s: could not find device id\n", __func__);
2237 return nfserr_noent;
2238 }
2239
2240 nfserr = nfserr_layoutunavailable;
2241 ops = nfsd4_layout_verify(exp, gdp->gd_layout_type);
2242 if (!ops)
2243 goto out;
2244
2245 nfserr = nfs_ok;
2246 if (gdp->gd_maxcount != 0) {
2247 nfserr = ops->proc_getdeviceinfo(exp->ex_path.mnt->mnt_sb,
2248 rqstp, cstate->clp, gdp);
2249 }
2250
2251 gdp->gd_notify_types &= ops->notify_types;
2252 out:
2253 exp_put(exp);
2254 return nfserr;
2255 }
2256
2257 static void
2258 nfsd4_getdeviceinfo_release(union nfsd4_op_u *u)
2259 {
2260 kfree(u->getdeviceinfo.gd_device);
2261 }
2262
2263 static __be32
2264 nfsd4_layoutget(struct svc_rqst *rqstp,
2265 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
2266 {
2267 struct nfsd4_layoutget *lgp = &u->layoutget;
2268 struct svc_fh *current_fh = &cstate->current_fh;
2269 const struct nfsd4_layout_ops *ops;
2270 struct nfs4_layout_stateid *ls;
2271 __be32 nfserr;
2272 int accmode = NFSD_MAY_READ_IF_EXEC | NFSD_MAY_OWNER_OVERRIDE;
2273
2274 switch (lgp->lg_seg.iomode) {
2275 case IOMODE_READ:
2276 accmode |= NFSD_MAY_READ;
2277 break;
2278 case IOMODE_RW:
2279 accmode |= NFSD_MAY_READ | NFSD_MAY_WRITE;
2280 break;
2281 default:
2282 dprintk("%s: invalid iomode %d\n",
2283 __func__, lgp->lg_seg.iomode);
2284 nfserr = nfserr_badiomode;
2285 goto out;
2286 }
2287
2288 nfserr = fh_verify(rqstp, current_fh, 0, accmode);
2289 if (nfserr)
2290 goto out;
2291
2292 nfserr = nfserr_layoutunavailable;
2293 ops = nfsd4_layout_verify(current_fh->fh_export, lgp->lg_layout_type);
2294 if (!ops)
2295 goto out;
2296
2297 /*
2298 * Verify minlength and range as per RFC5661:
2299 * o If loga_length is less than loga_minlength,
2300 * the metadata server MUST return NFS4ERR_INVAL.
2301 * o If the sum of loga_offset and loga_minlength exceeds
2302 * NFS4_UINT64_MAX, and loga_minlength is not
2303 * NFS4_UINT64_MAX, the error NFS4ERR_INVAL MUST result.
2304 * o If the sum of loga_offset and loga_length exceeds
2305 * NFS4_UINT64_MAX, and loga_length is not NFS4_UINT64_MAX,
2306 * the error NFS4ERR_INVAL MUST result.
2307 */
2308 nfserr = nfserr_inval;
2309 if (lgp->lg_seg.length < lgp->lg_minlength ||
2310 (lgp->lg_minlength != NFS4_MAX_UINT64 &&
2311 lgp->lg_minlength > NFS4_MAX_UINT64 - lgp->lg_seg.offset) ||
2312 (lgp->lg_seg.length != NFS4_MAX_UINT64 &&
2313 lgp->lg_seg.length > NFS4_MAX_UINT64 - lgp->lg_seg.offset))
2314 goto out;
2315 if (lgp->lg_seg.length == 0)
2316 goto out;
2317
2318 nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lgp->lg_sid,
2319 true, lgp->lg_layout_type, &ls);
2320 if (nfserr) {
2321 trace_nfsd_layout_get_lookup_fail(&lgp->lg_sid);
2322 goto out;
2323 }
2324
2325 nfserr = nfserr_recallconflict;
2326 if (atomic_read(&ls->ls_stid.sc_file->fi_lo_recalls))
2327 goto out_put_stid;
2328
2329 nfserr = ops->proc_layoutget(d_inode(current_fh->fh_dentry),
2330 current_fh, lgp);
2331 if (nfserr)
2332 goto out_put_stid;
2333
2334 nfserr = nfsd4_insert_layout(lgp, ls);
2335
2336 out_put_stid:
2337 mutex_unlock(&ls->ls_mutex);
2338 nfs4_put_stid(&ls->ls_stid);
2339 out:
2340 return nfserr;
2341 }
2342
2343 static void
2344 nfsd4_layoutget_release(union nfsd4_op_u *u)
2345 {
2346 kfree(u->layoutget.lg_content);
2347 }
2348
2349 static __be32
2350 nfsd4_layoutcommit(struct svc_rqst *rqstp,
2351 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
2352 {
2353 struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
2354 const struct nfsd4_layout_seg *seg = &lcp->lc_seg;
2355 struct svc_fh *current_fh = &cstate->current_fh;
2356 const struct nfsd4_layout_ops *ops;
2357 loff_t new_size = lcp->lc_last_wr + 1;
2358 struct inode *inode;
2359 struct nfs4_layout_stateid *ls;
2360 __be32 nfserr;
2361
2362 nfserr = fh_verify(rqstp, current_fh, 0,
2363 NFSD_MAY_WRITE | NFSD_MAY_OWNER_OVERRIDE);
2364 if (nfserr)
2365 goto out;
2366
2367 nfserr = nfserr_layoutunavailable;
2368 ops = nfsd4_layout_verify(current_fh->fh_export, lcp->lc_layout_type);
2369 if (!ops)
2370 goto out;
2371 inode = d_inode(current_fh->fh_dentry);
2372
2373 nfserr = nfserr_inval;
2374 if (new_size <= seg->offset) {
2375 dprintk("pnfsd: last write before layout segment\n");
2376 goto out;
2377 }
2378 if (new_size > seg->offset + seg->length) {
2379 dprintk("pnfsd: last write beyond layout segment\n");
2380 goto out;
2381 }
2382 if (!lcp->lc_newoffset && new_size > i_size_read(inode)) {
2383 dprintk("pnfsd: layoutcommit beyond EOF\n");
2384 goto out;
2385 }
2386
2387 nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lcp->lc_sid,
2388 false, lcp->lc_layout_type,
2389 &ls);
2390 if (nfserr) {
2391 trace_nfsd_layout_commit_lookup_fail(&lcp->lc_sid);
2392 /* fixup error code as per RFC5661 */
2393 if (nfserr == nfserr_bad_stateid)
2394 nfserr = nfserr_badlayout;
2395 goto out;
2396 }
2397
2398 /* LAYOUTCOMMIT does not require any serialization */
2399 mutex_unlock(&ls->ls_mutex);
2400
2401 if (new_size > i_size_read(inode)) {
2402 lcp->lc_size_chg = true;
2403 lcp->lc_newsize = new_size;
2404 } else {
2405 lcp->lc_size_chg = false;
2406 }
2407
2408 nfserr = ops->proc_layoutcommit(inode, lcp);
2409 nfs4_put_stid(&ls->ls_stid);
2410 out:
2411 return nfserr;
2412 }
2413
2414 static __be32
2415 nfsd4_layoutreturn(struct svc_rqst *rqstp,
2416 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
2417 {
2418 struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
2419 struct svc_fh *current_fh = &cstate->current_fh;
2420 __be32 nfserr;
2421
2422 nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_NOP);
2423 if (nfserr)
2424 goto out;
2425
2426 nfserr = nfserr_layoutunavailable;
2427 if (!nfsd4_layout_verify(current_fh->fh_export, lrp->lr_layout_type))
2428 goto out;
2429
2430 switch (lrp->lr_seg.iomode) {
2431 case IOMODE_READ:
2432 case IOMODE_RW:
2433 case IOMODE_ANY:
2434 break;
2435 default:
2436 dprintk("%s: invalid iomode %d\n", __func__,
2437 lrp->lr_seg.iomode);
2438 nfserr = nfserr_inval;
2439 goto out;
2440 }
2441
2442 switch (lrp->lr_return_type) {
2443 case RETURN_FILE:
2444 nfserr = nfsd4_return_file_layouts(rqstp, cstate, lrp);
2445 break;
2446 case RETURN_FSID:
2447 case RETURN_ALL:
2448 nfserr = nfsd4_return_client_layouts(rqstp, cstate, lrp);
2449 break;
2450 default:
2451 dprintk("%s: invalid return_type %d\n", __func__,
2452 lrp->lr_return_type);
2453 nfserr = nfserr_inval;
2454 break;
2455 }
2456 out:
2457 return nfserr;
2458 }
2459 #endif /* CONFIG_NFSD_PNFS */
2460
2461 static __be32
2462 nfsd4_getxattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2463 union nfsd4_op_u *u)
2464 {
2465 struct nfsd4_getxattr *getxattr = &u->getxattr;
2466
2467 return nfsd_getxattr(rqstp, &cstate->current_fh,
2468 getxattr->getxa_name, &getxattr->getxa_buf,
2469 &getxattr->getxa_len);
2470 }
2471
2472 static __be32
2473 nfsd4_setxattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2474 union nfsd4_op_u *u)
2475 {
2476 struct nfsd4_setxattr *setxattr = &u->setxattr;
2477 __be32 ret;
2478
2479 if (opens_in_grace(SVC_NET(rqstp)))
2480 return nfserr_grace;
2481
2482 ret = nfsd_setxattr(rqstp, &cstate->current_fh, setxattr->setxa_name,
2483 setxattr->setxa_buf, setxattr->setxa_len,
2484 setxattr->setxa_flags);
2485
2486 if (!ret)
2487 set_change_info(&setxattr->setxa_cinfo, &cstate->current_fh);
2488
2489 return ret;
2490 }
2491
2492 static __be32
2493 nfsd4_listxattrs(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2494 union nfsd4_op_u *u)
2495 {
2496 /*
2497 * Get the entire list, then copy out only the user attributes
2498 * in the encode function.
2499 */
2500 return nfsd_listxattr(rqstp, &cstate->current_fh,
2501 &u->listxattrs.lsxa_buf, &u->listxattrs.lsxa_len);
2502 }
2503
2504 static __be32
2505 nfsd4_removexattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2506 union nfsd4_op_u *u)
2507 {
2508 struct nfsd4_removexattr *removexattr = &u->removexattr;
2509 __be32 ret;
2510
2511 if (opens_in_grace(SVC_NET(rqstp)))
2512 return nfserr_grace;
2513
2514 ret = nfsd_removexattr(rqstp, &cstate->current_fh,
2515 removexattr->rmxa_name);
2516
2517 if (!ret)
2518 set_change_info(&removexattr->rmxa_cinfo, &cstate->current_fh);
2519
2520 return ret;
2521 }
2522
2523 /*
2524 * NULL call.
2525 */
2526 static __be32
2527 nfsd4_proc_null(struct svc_rqst *rqstp)
2528 {
2529 return rpc_success;
2530 }
2531
2532 static inline void nfsd4_increment_op_stats(struct nfsd_net *nn, u32 opnum)
2533 {
2534 if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
2535 percpu_counter_inc(&nn->counter[NFSD_STATS_NFS4_OP(opnum)]);
2536 }
2537
2538 static const struct nfsd4_operation nfsd4_ops[];
2539
2540 static const char *nfsd4_op_name(unsigned opnum);
2541
2542 /*
2543 * Enforce NFSv4.1 COMPOUND ordering rules:
2544 *
2545 * Also note, enforced elsewhere:
2546 * - SEQUENCE other than as first op results in
2547 * NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
2548 * - BIND_CONN_TO_SESSION must be the only op in its compound.
2549 * (Enforced in nfsd4_bind_conn_to_session().)
2550 * - DESTROY_SESSION must be the final operation in a compound, if
2551 * sessionid's in SEQUENCE and DESTROY_SESSION are the same.
2552 * (Enforced in nfsd4_destroy_session().)
2553 */
2554 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
2555 {
2556 struct nfsd4_op *first_op = &args->ops[0];
2557
2558 /* These ordering requirements don't apply to NFSv4.0: */
2559 if (args->minorversion == 0)
2560 return nfs_ok;
2561 /* This is weird, but OK, not our problem: */
2562 if (args->opcnt == 0)
2563 return nfs_ok;
2564 if (first_op->status == nfserr_op_illegal)
2565 return nfs_ok;
2566 if (!(nfsd4_ops[first_op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
2567 return nfserr_op_not_in_session;
2568 if (first_op->opnum == OP_SEQUENCE)
2569 return nfs_ok;
2570 /*
2571 * So first_op is something allowed outside a session, like
2572 * EXCHANGE_ID; but then it has to be the only op in the
2573 * compound:
2574 */
2575 if (args->opcnt != 1)
2576 return nfserr_not_only_op;
2577 return nfs_ok;
2578 }
2579
2580 const struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
2581 {
2582 return &nfsd4_ops[op->opnum];
2583 }
2584
2585 bool nfsd4_cache_this_op(struct nfsd4_op *op)
2586 {
2587 if (op->opnum == OP_ILLEGAL)
2588 return false;
2589 return OPDESC(op)->op_flags & OP_CACHEME;
2590 }
2591
2592 static bool need_wrongsec_check(struct svc_rqst *rqstp)
2593 {
2594 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2595 struct nfsd4_compoundargs *argp = rqstp->rq_argp;
2596 struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
2597 struct nfsd4_op *next = &argp->ops[resp->opcnt];
2598 const struct nfsd4_operation *thisd = OPDESC(this);
2599 const struct nfsd4_operation *nextd;
2600
2601 /*
2602 * Most ops check wronsec on our own; only the putfh-like ops
2603 * have special rules.
2604 */
2605 if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
2606 return false;
2607 /*
2608 * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
2609 * put-filehandle operation if we're not going to use the
2610 * result:
2611 */
2612 if (argp->opcnt == resp->opcnt)
2613 return false;
2614 if (next->opnum == OP_ILLEGAL)
2615 return false;
2616 nextd = OPDESC(next);
2617 /*
2618 * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
2619 * errors themselves as necessary; others should check for them
2620 * now:
2621 */
2622 return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
2623 }
2624
2625 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
2626 static void
2627 check_if_stalefh_allowed(struct nfsd4_compoundargs *args)
2628 {
2629 struct nfsd4_op *op, *current_op = NULL, *saved_op = NULL;
2630 struct nfsd4_copy *copy;
2631 struct nfsd4_putfh *putfh;
2632 int i;
2633
2634 /* traverse all operation and if it's a COPY compound, mark the
2635 * source filehandle to skip verification
2636 */
2637 for (i = 0; i < args->opcnt; i++) {
2638 op = &args->ops[i];
2639 if (op->opnum == OP_PUTFH)
2640 current_op = op;
2641 else if (op->opnum == OP_SAVEFH)
2642 saved_op = current_op;
2643 else if (op->opnum == OP_RESTOREFH)
2644 current_op = saved_op;
2645 else if (op->opnum == OP_COPY) {
2646 copy = (struct nfsd4_copy *)&op->u;
2647 if (!saved_op) {
2648 op->status = nfserr_nofilehandle;
2649 return;
2650 }
2651 putfh = (struct nfsd4_putfh *)&saved_op->u;
2652 if (nfsd4_ssc_is_inter(copy))
2653 putfh->no_verify = true;
2654 }
2655 }
2656 }
2657 #else
2658 static void
2659 check_if_stalefh_allowed(struct nfsd4_compoundargs *args)
2660 {
2661 }
2662 #endif
2663
2664 /*
2665 * COMPOUND call.
2666 */
2667 static __be32
2668 nfsd4_proc_compound(struct svc_rqst *rqstp)
2669 {
2670 struct nfsd4_compoundargs *args = rqstp->rq_argp;
2671 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2672 struct nfsd4_op *op;
2673 struct nfsd4_compound_state *cstate = &resp->cstate;
2674 struct svc_fh *current_fh = &cstate->current_fh;
2675 struct svc_fh *save_fh = &cstate->save_fh;
2676 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2677 __be32 status;
2678
2679 resp->xdr = &rqstp->rq_res_stream;
2680 resp->statusp = resp->xdr->p;
2681
2682 /* reserve space for: NFS status code */
2683 xdr_reserve_space(resp->xdr, XDR_UNIT);
2684
2685 /* reserve space for: taglen, tag, and opcnt */
2686 xdr_reserve_space(resp->xdr, XDR_UNIT * 2 + args->taglen);
2687 resp->taglen = args->taglen;
2688 resp->tag = args->tag;
2689 resp->rqstp = rqstp;
2690 cstate->minorversion = args->minorversion;
2691 fh_init(current_fh, NFS4_FHSIZE);
2692 fh_init(save_fh, NFS4_FHSIZE);
2693 /*
2694 * Don't use the deferral mechanism for NFSv4; compounds make it
2695 * too hard to avoid non-idempotency problems.
2696 */
2697 clear_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
2698
2699 /*
2700 * According to RFC3010, this takes precedence over all other errors.
2701 */
2702 status = nfserr_minor_vers_mismatch;
2703 if (nfsd_minorversion(nn, args->minorversion, NFSD_TEST) <= 0)
2704 goto out;
2705
2706 status = nfs41_check_op_ordering(args);
2707 if (status) {
2708 op = &args->ops[0];
2709 op->status = status;
2710 resp->opcnt = 1;
2711 goto encode_op;
2712 }
2713 check_if_stalefh_allowed(args);
2714
2715 rqstp->rq_lease_breaker = (void **)&cstate->clp;
2716
2717 trace_nfsd_compound(rqstp, args->tag, args->taglen, args->client_opcnt);
2718 while (!status && resp->opcnt < args->opcnt) {
2719 op = &args->ops[resp->opcnt++];
2720
2721 if (unlikely(resp->opcnt == NFSD_MAX_OPS_PER_COMPOUND)) {
2722 /* If there are still more operations to process,
2723 * stop here and report NFS4ERR_RESOURCE. */
2724 if (cstate->minorversion == 0 &&
2725 args->client_opcnt > resp->opcnt) {
2726 op->status = nfserr_resource;
2727 goto encode_op;
2728 }
2729 }
2730
2731 /*
2732 * The XDR decode routines may have pre-set op->status;
2733 * for example, if there is a miscellaneous XDR error
2734 * it will be set to nfserr_bad_xdr.
2735 */
2736 if (op->status) {
2737 if (op->opnum == OP_OPEN)
2738 op->status = nfsd4_open_omfg(rqstp, cstate, op);
2739 goto encode_op;
2740 }
2741 if (!current_fh->fh_dentry &&
2742 !HAS_FH_FLAG(current_fh, NFSD4_FH_FOREIGN)) {
2743 if (!(op->opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
2744 op->status = nfserr_nofilehandle;
2745 goto encode_op;
2746 }
2747 } else if (current_fh->fh_export &&
2748 current_fh->fh_export->ex_fslocs.migrated &&
2749 !(op->opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
2750 op->status = nfserr_moved;
2751 goto encode_op;
2752 }
2753
2754 fh_clear_pre_post_attrs(current_fh);
2755
2756 /* If op is non-idempotent */
2757 if (op->opdesc->op_flags & OP_MODIFIES_SOMETHING) {
2758 /*
2759 * Don't execute this op if we couldn't encode a
2760 * successful reply:
2761 */
2762 u32 plen = op->opdesc->op_rsize_bop(rqstp, op);
2763 /*
2764 * Plus if there's another operation, make sure
2765 * we'll have space to at least encode an error:
2766 */
2767 if (resp->opcnt < args->opcnt)
2768 plen += COMPOUND_ERR_SLACK_SPACE;
2769 op->status = nfsd4_check_resp_size(resp, plen);
2770 }
2771
2772 if (op->status)
2773 goto encode_op;
2774
2775 if (op->opdesc->op_get_currentstateid)
2776 op->opdesc->op_get_currentstateid(cstate, &op->u);
2777 op->status = op->opdesc->op_func(rqstp, cstate, &op->u);
2778
2779 /* Only from SEQUENCE */
2780 if (cstate->status == nfserr_replay_cache) {
2781 dprintk("%s NFS4.1 replay from cache\n", __func__);
2782 status = op->status;
2783 goto out;
2784 }
2785 if (!op->status) {
2786 if (op->opdesc->op_set_currentstateid)
2787 op->opdesc->op_set_currentstateid(cstate, &op->u);
2788
2789 if (op->opdesc->op_flags & OP_CLEAR_STATEID)
2790 clear_current_stateid(cstate);
2791
2792 if (current_fh->fh_export &&
2793 need_wrongsec_check(rqstp))
2794 op->status = check_nfsd_access(current_fh->fh_export, rqstp);
2795 }
2796 encode_op:
2797 if (op->status == nfserr_replay_me) {
2798 op->replay = &cstate->replay_owner->so_replay;
2799 nfsd4_encode_replay(resp->xdr, op);
2800 status = op->status = op->replay->rp_status;
2801 } else {
2802 nfsd4_encode_operation(resp, op);
2803 status = op->status;
2804 }
2805
2806 trace_nfsd_compound_status(args->client_opcnt, resp->opcnt,
2807 status, nfsd4_op_name(op->opnum));
2808
2809 nfsd4_cstate_clear_replay(cstate);
2810 nfsd4_increment_op_stats(nn, op->opnum);
2811 }
2812
2813 fh_put(current_fh);
2814 fh_put(save_fh);
2815 BUG_ON(cstate->replay_owner);
2816 out:
2817 cstate->status = status;
2818 /* Reset deferral mechanism for RPC deferrals */
2819 set_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
2820 return rpc_success;
2821 }
2822
2823 #define op_encode_hdr_size (2)
2824 #define op_encode_stateid_maxsz (XDR_QUADLEN(NFS4_STATEID_SIZE))
2825 #define op_encode_verifier_maxsz (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
2826 #define op_encode_change_info_maxsz (5)
2827 #define nfs4_fattr_bitmap_maxsz (4)
2828
2829 /* We'll fall back on returning no lockowner if run out of space: */
2830 #define op_encode_lockowner_maxsz (0)
2831 #define op_encode_lock_denied_maxsz (8 + op_encode_lockowner_maxsz)
2832
2833 #define nfs4_owner_maxsz (1 + XDR_QUADLEN(IDMAP_NAMESZ))
2834
2835 #define op_encode_ace_maxsz (3 + nfs4_owner_maxsz)
2836 #define op_encode_delegation_maxsz (1 + op_encode_stateid_maxsz + 1 + \
2837 op_encode_ace_maxsz)
2838
2839 #define op_encode_channel_attrs_maxsz (6 + 1 + 1)
2840
2841 /*
2842 * The _rsize() helpers are invoked by the NFSv4 COMPOUND decoder, which
2843 * is called before sunrpc sets rq_res.buflen. Thus we have to compute
2844 * the maximum payload size here, based on transport limits and the size
2845 * of the remaining space in the rq_pages array.
2846 */
2847 static u32 nfsd4_max_payload(const struct svc_rqst *rqstp)
2848 {
2849 u32 buflen;
2850
2851 buflen = (rqstp->rq_page_end - rqstp->rq_next_page) * PAGE_SIZE;
2852 buflen -= rqstp->rq_auth_slack;
2853 buflen -= rqstp->rq_res.head[0].iov_len;
2854 return min_t(u32, buflen, svc_max_payload(rqstp));
2855 }
2856
2857 static u32 nfsd4_only_status_rsize(const struct svc_rqst *rqstp,
2858 const struct nfsd4_op *op)
2859 {
2860 return (op_encode_hdr_size) * sizeof(__be32);
2861 }
2862
2863 static u32 nfsd4_status_stateid_rsize(const struct svc_rqst *rqstp,
2864 const struct nfsd4_op *op)
2865 {
2866 return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
2867 }
2868
2869 static u32 nfsd4_access_rsize(const struct svc_rqst *rqstp,
2870 const struct nfsd4_op *op)
2871 {
2872 /* ac_supported, ac_resp_access */
2873 return (op_encode_hdr_size + 2)* sizeof(__be32);
2874 }
2875
2876 static u32 nfsd4_commit_rsize(const struct svc_rqst *rqstp,
2877 const struct nfsd4_op *op)
2878 {
2879 return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
2880 }
2881
2882 static u32 nfsd4_create_rsize(const struct svc_rqst *rqstp,
2883 const struct nfsd4_op *op)
2884 {
2885 return (op_encode_hdr_size + op_encode_change_info_maxsz
2886 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
2887 }
2888
2889 /*
2890 * Note since this is an idempotent operation we won't insist on failing
2891 * the op prematurely if the estimate is too large. We may turn off splice
2892 * reads unnecessarily.
2893 */
2894 static u32 nfsd4_getattr_rsize(const struct svc_rqst *rqstp,
2895 const struct nfsd4_op *op)
2896 {
2897 const u32 *bmap = op->u.getattr.ga_bmval;
2898 u32 bmap0 = bmap[0], bmap1 = bmap[1], bmap2 = bmap[2];
2899 u32 ret = 0;
2900
2901 if (bmap0 & FATTR4_WORD0_ACL)
2902 return nfsd4_max_payload(rqstp);
2903 if (bmap0 & FATTR4_WORD0_FS_LOCATIONS)
2904 return nfsd4_max_payload(rqstp);
2905
2906 if (bmap1 & FATTR4_WORD1_OWNER) {
2907 ret += IDMAP_NAMESZ + 4;
2908 bmap1 &= ~FATTR4_WORD1_OWNER;
2909 }
2910 if (bmap1 & FATTR4_WORD1_OWNER_GROUP) {
2911 ret += IDMAP_NAMESZ + 4;
2912 bmap1 &= ~FATTR4_WORD1_OWNER_GROUP;
2913 }
2914 if (bmap0 & FATTR4_WORD0_FILEHANDLE) {
2915 ret += NFS4_FHSIZE + 4;
2916 bmap0 &= ~FATTR4_WORD0_FILEHANDLE;
2917 }
2918 if (bmap2 & FATTR4_WORD2_SECURITY_LABEL) {
2919 ret += NFS4_MAXLABELLEN + 12;
2920 bmap2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2921 }
2922 /*
2923 * Largest of remaining attributes are 16 bytes (e.g.,
2924 * supported_attributes)
2925 */
2926 ret += 16 * (hweight32(bmap0) + hweight32(bmap1) + hweight32(bmap2));
2927 /* bitmask, length */
2928 ret += 20;
2929 return ret;
2930 }
2931
2932 static u32 nfsd4_getfh_rsize(const struct svc_rqst *rqstp,
2933 const struct nfsd4_op *op)
2934 {
2935 return (op_encode_hdr_size + 1) * sizeof(__be32) + NFS4_FHSIZE;
2936 }
2937
2938 static u32 nfsd4_link_rsize(const struct svc_rqst *rqstp,
2939 const struct nfsd4_op *op)
2940 {
2941 return (op_encode_hdr_size + op_encode_change_info_maxsz)
2942 * sizeof(__be32);
2943 }
2944
2945 static u32 nfsd4_lock_rsize(const struct svc_rqst *rqstp,
2946 const struct nfsd4_op *op)
2947 {
2948 return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
2949 * sizeof(__be32);
2950 }
2951
2952 static u32 nfsd4_open_rsize(const struct svc_rqst *rqstp,
2953 const struct nfsd4_op *op)
2954 {
2955 return (op_encode_hdr_size + op_encode_stateid_maxsz
2956 + op_encode_change_info_maxsz + 1
2957 + nfs4_fattr_bitmap_maxsz
2958 + op_encode_delegation_maxsz) * sizeof(__be32);
2959 }
2960
2961 static u32 nfsd4_read_rsize(const struct svc_rqst *rqstp,
2962 const struct nfsd4_op *op)
2963 {
2964 u32 rlen = min(op->u.read.rd_length, nfsd4_max_payload(rqstp));
2965
2966 return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
2967 }
2968
2969 static u32 nfsd4_read_plus_rsize(const struct svc_rqst *rqstp,
2970 const struct nfsd4_op *op)
2971 {
2972 u32 rlen = min(op->u.read.rd_length, nfsd4_max_payload(rqstp));
2973 /*
2974 * If we detect that the file changed during hole encoding, then we
2975 * recover by encoding the remaining reply as data. This means we need
2976 * to set aside enough room to encode two data segments.
2977 */
2978 u32 seg_len = 2 * (1 + 2 + 1);
2979
2980 return (op_encode_hdr_size + 2 + seg_len + XDR_QUADLEN(rlen)) * sizeof(__be32);
2981 }
2982
2983 static u32 nfsd4_readdir_rsize(const struct svc_rqst *rqstp,
2984 const struct nfsd4_op *op)
2985 {
2986 u32 rlen = min(op->u.readdir.rd_maxcount, nfsd4_max_payload(rqstp));
2987
2988 return (op_encode_hdr_size + op_encode_verifier_maxsz +
2989 XDR_QUADLEN(rlen)) * sizeof(__be32);
2990 }
2991
2992 static u32 nfsd4_readlink_rsize(const struct svc_rqst *rqstp,
2993 const struct nfsd4_op *op)
2994 {
2995 return (op_encode_hdr_size + 1) * sizeof(__be32) + PAGE_SIZE;
2996 }
2997
2998 static u32 nfsd4_remove_rsize(const struct svc_rqst *rqstp,
2999 const struct nfsd4_op *op)
3000 {
3001 return (op_encode_hdr_size + op_encode_change_info_maxsz)
3002 * sizeof(__be32);
3003 }
3004
3005 static u32 nfsd4_rename_rsize(const struct svc_rqst *rqstp,
3006 const struct nfsd4_op *op)
3007 {
3008 return (op_encode_hdr_size + op_encode_change_info_maxsz
3009 + op_encode_change_info_maxsz) * sizeof(__be32);
3010 }
3011
3012 static u32 nfsd4_sequence_rsize(const struct svc_rqst *rqstp,
3013 const struct nfsd4_op *op)
3014 {
3015 return (op_encode_hdr_size
3016 + XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5) * sizeof(__be32);
3017 }
3018
3019 static u32 nfsd4_test_stateid_rsize(const struct svc_rqst *rqstp,
3020 const struct nfsd4_op *op)
3021 {
3022 return (op_encode_hdr_size + 1 + op->u.test_stateid.ts_num_ids)
3023 * sizeof(__be32);
3024 }
3025
3026 static u32 nfsd4_setattr_rsize(const struct svc_rqst *rqstp,
3027 const struct nfsd4_op *op)
3028 {
3029 return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
3030 }
3031
3032 static u32 nfsd4_secinfo_rsize(const struct svc_rqst *rqstp,
3033 const struct nfsd4_op *op)
3034 {
3035 return (op_encode_hdr_size + RPC_AUTH_MAXFLAVOR *
3036 (4 + XDR_QUADLEN(GSS_OID_MAX_LEN))) * sizeof(__be32);
3037 }
3038
3039 static u32 nfsd4_setclientid_rsize(const struct svc_rqst *rqstp,
3040 const struct nfsd4_op *op)
3041 {
3042 return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
3043 sizeof(__be32);
3044 }
3045
3046 static u32 nfsd4_write_rsize(const struct svc_rqst *rqstp,
3047 const struct nfsd4_op *op)
3048 {
3049 return (op_encode_hdr_size + 2 + op_encode_verifier_maxsz) * sizeof(__be32);
3050 }
3051
3052 static u32 nfsd4_exchange_id_rsize(const struct svc_rqst *rqstp,
3053 const struct nfsd4_op *op)
3054 {
3055 return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
3056 1 + 1 + /* eir_flags, spr_how */\
3057 4 + /* spo_must_enforce & _allow with bitmap */\
3058 2 + /*eir_server_owner.so_minor_id */\
3059 /* eir_server_owner.so_major_id<> */\
3060 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
3061 /* eir_server_scope<> */\
3062 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
3063 1 + /* eir_server_impl_id array length */\
3064 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
3065 }
3066
3067 static u32 nfsd4_bind_conn_to_session_rsize(const struct svc_rqst *rqstp,
3068 const struct nfsd4_op *op)
3069 {
3070 return (op_encode_hdr_size + \
3071 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
3072 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
3073 }
3074
3075 static u32 nfsd4_create_session_rsize(const struct svc_rqst *rqstp,
3076 const struct nfsd4_op *op)
3077 {
3078 return (op_encode_hdr_size + \
3079 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
3080 2 + /* csr_sequence, csr_flags */\
3081 op_encode_channel_attrs_maxsz + \
3082 op_encode_channel_attrs_maxsz) * sizeof(__be32);
3083 }
3084
3085 static u32 nfsd4_copy_rsize(const struct svc_rqst *rqstp,
3086 const struct nfsd4_op *op)
3087 {
3088 return (op_encode_hdr_size +
3089 1 /* wr_callback */ +
3090 op_encode_stateid_maxsz /* wr_callback */ +
3091 2 /* wr_count */ +
3092 1 /* wr_committed */ +
3093 op_encode_verifier_maxsz +
3094 1 /* cr_consecutive */ +
3095 1 /* cr_synchronous */) * sizeof(__be32);
3096 }
3097
3098 static u32 nfsd4_offload_status_rsize(const struct svc_rqst *rqstp,
3099 const struct nfsd4_op *op)
3100 {
3101 return (op_encode_hdr_size +
3102 2 /* osr_count */ +
3103 1 /* osr_complete<1> optional 0 for now */) * sizeof(__be32);
3104 }
3105
3106 static u32 nfsd4_copy_notify_rsize(const struct svc_rqst *rqstp,
3107 const struct nfsd4_op *op)
3108 {
3109 return (op_encode_hdr_size +
3110 3 /* cnr_lease_time */ +
3111 1 /* We support one cnr_source_server */ +
3112 1 /* cnr_stateid seq */ +
3113 op_encode_stateid_maxsz /* cnr_stateid */ +
3114 1 /* num cnr_source_server*/ +
3115 1 /* nl4_type */ +
3116 1 /* nl4 size */ +
3117 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) /*nl4_loc + nl4_loc_sz */)
3118 * sizeof(__be32);
3119 }
3120
3121 static u32 nfsd4_get_dir_delegation_rsize(const struct svc_rqst *rqstp,
3122 const struct nfsd4_op *op)
3123 {
3124 return (op_encode_hdr_size +
3125 1 /* gddr_status */ +
3126 op_encode_verifier_maxsz +
3127 op_encode_stateid_maxsz +
3128 2 /* gddr_notification */ +
3129 2 /* gddr_child_attributes */ +
3130 2 /* gddr_dir_attributes */);
3131 }
3132
3133 #ifdef CONFIG_NFSD_PNFS
3134 static u32 nfsd4_getdeviceinfo_rsize(const struct svc_rqst *rqstp,
3135 const struct nfsd4_op *op)
3136 {
3137 u32 rlen = min(op->u.getdeviceinfo.gd_maxcount, nfsd4_max_payload(rqstp));
3138
3139 return (op_encode_hdr_size +
3140 1 /* gd_layout_type*/ +
3141 XDR_QUADLEN(rlen) +
3142 2 /* gd_notify_types */) * sizeof(__be32);
3143 }
3144
3145 /*
3146 * At this stage we don't really know what layout driver will handle the request,
3147 * so we need to define an arbitrary upper bound here.
3148 */
3149 #define MAX_LAYOUT_SIZE 128
3150 static u32 nfsd4_layoutget_rsize(const struct svc_rqst *rqstp,
3151 const struct nfsd4_op *op)
3152 {
3153 return (op_encode_hdr_size +
3154 1 /* logr_return_on_close */ +
3155 op_encode_stateid_maxsz +
3156 1 /* nr of layouts */ +
3157 MAX_LAYOUT_SIZE) * sizeof(__be32);
3158 }
3159
3160 static u32 nfsd4_layoutcommit_rsize(const struct svc_rqst *rqstp,
3161 const struct nfsd4_op *op)
3162 {
3163 return (op_encode_hdr_size +
3164 1 /* locr_newsize */ +
3165 2 /* ns_size */) * sizeof(__be32);
3166 }
3167
3168 static u32 nfsd4_layoutreturn_rsize(const struct svc_rqst *rqstp,
3169 const struct nfsd4_op *op)
3170 {
3171 return (op_encode_hdr_size +
3172 1 /* lrs_stateid */ +
3173 op_encode_stateid_maxsz) * sizeof(__be32);
3174 }
3175 #endif /* CONFIG_NFSD_PNFS */
3176
3177
3178 static u32 nfsd4_seek_rsize(const struct svc_rqst *rqstp,
3179 const struct nfsd4_op *op)
3180 {
3181 return (op_encode_hdr_size + 3) * sizeof(__be32);
3182 }
3183
3184 static u32 nfsd4_getxattr_rsize(const struct svc_rqst *rqstp,
3185 const struct nfsd4_op *op)
3186 {
3187 u32 rlen = min_t(u32, XATTR_SIZE_MAX, nfsd4_max_payload(rqstp));
3188
3189 return (op_encode_hdr_size + 1 + XDR_QUADLEN(rlen)) * sizeof(__be32);
3190 }
3191
3192 static u32 nfsd4_setxattr_rsize(const struct svc_rqst *rqstp,
3193 const struct nfsd4_op *op)
3194 {
3195 return (op_encode_hdr_size + op_encode_change_info_maxsz)
3196 * sizeof(__be32);
3197 }
3198 static u32 nfsd4_listxattrs_rsize(const struct svc_rqst *rqstp,
3199 const struct nfsd4_op *op)
3200 {
3201 u32 rlen = min(op->u.listxattrs.lsxa_maxcount, nfsd4_max_payload(rqstp));
3202
3203 return (op_encode_hdr_size + 4 + XDR_QUADLEN(rlen)) * sizeof(__be32);
3204 }
3205
3206 static u32 nfsd4_removexattr_rsize(const struct svc_rqst *rqstp,
3207 const struct nfsd4_op *op)
3208 {
3209 return (op_encode_hdr_size + op_encode_change_info_maxsz)
3210 * sizeof(__be32);
3211 }
3212
3213
3214 static const struct nfsd4_operation nfsd4_ops[] = {
3215 [OP_ACCESS] = {
3216 .op_func = nfsd4_access,
3217 .op_name = "OP_ACCESS",
3218 .op_rsize_bop = nfsd4_access_rsize,
3219 },
3220 [OP_CLOSE] = {
3221 .op_func = nfsd4_close,
3222 .op_flags = OP_MODIFIES_SOMETHING,
3223 .op_name = "OP_CLOSE",
3224 .op_rsize_bop = nfsd4_status_stateid_rsize,
3225 .op_get_currentstateid = nfsd4_get_closestateid,
3226 .op_set_currentstateid = nfsd4_set_closestateid,
3227 },
3228 [OP_COMMIT] = {
3229 .op_func = nfsd4_commit,
3230 .op_flags = OP_MODIFIES_SOMETHING,
3231 .op_name = "OP_COMMIT",
3232 .op_rsize_bop = nfsd4_commit_rsize,
3233 },
3234 [OP_CREATE] = {
3235 .op_func = nfsd4_create,
3236 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
3237 .op_name = "OP_CREATE",
3238 .op_rsize_bop = nfsd4_create_rsize,
3239 },
3240 [OP_DELEGRETURN] = {
3241 .op_func = nfsd4_delegreturn,
3242 .op_flags = OP_MODIFIES_SOMETHING,
3243 .op_name = "OP_DELEGRETURN",
3244 .op_rsize_bop = nfsd4_only_status_rsize,
3245 .op_get_currentstateid = nfsd4_get_delegreturnstateid,
3246 },
3247 [OP_GETATTR] = {
3248 .op_func = nfsd4_getattr,
3249 .op_flags = ALLOWED_ON_ABSENT_FS,
3250 .op_rsize_bop = nfsd4_getattr_rsize,
3251 .op_name = "OP_GETATTR",
3252 },
3253 [OP_GETFH] = {
3254 .op_func = nfsd4_getfh,
3255 .op_name = "OP_GETFH",
3256 .op_rsize_bop = nfsd4_getfh_rsize,
3257 },
3258 [OP_LINK] = {
3259 .op_func = nfsd4_link,
3260 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
3261 | OP_CACHEME,
3262 .op_name = "OP_LINK",
3263 .op_rsize_bop = nfsd4_link_rsize,
3264 },
3265 [OP_LOCK] = {
3266 .op_func = nfsd4_lock,
3267 .op_release = nfsd4_lock_release,
3268 .op_flags = OP_MODIFIES_SOMETHING |
3269 OP_NONTRIVIAL_ERROR_ENCODE,
3270 .op_name = "OP_LOCK",
3271 .op_rsize_bop = nfsd4_lock_rsize,
3272 .op_set_currentstateid = nfsd4_set_lockstateid,
3273 },
3274 [OP_LOCKT] = {
3275 .op_func = nfsd4_lockt,
3276 .op_release = nfsd4_lockt_release,
3277 .op_flags = OP_NONTRIVIAL_ERROR_ENCODE,
3278 .op_name = "OP_LOCKT",
3279 .op_rsize_bop = nfsd4_lock_rsize,
3280 },
3281 [OP_LOCKU] = {
3282 .op_func = nfsd4_locku,
3283 .op_flags = OP_MODIFIES_SOMETHING,
3284 .op_name = "OP_LOCKU",
3285 .op_rsize_bop = nfsd4_status_stateid_rsize,
3286 .op_get_currentstateid = nfsd4_get_lockustateid,
3287 },
3288 [OP_LOOKUP] = {
3289 .op_func = nfsd4_lookup,
3290 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
3291 .op_name = "OP_LOOKUP",
3292 .op_rsize_bop = nfsd4_only_status_rsize,
3293 },
3294 [OP_LOOKUPP] = {
3295 .op_func = nfsd4_lookupp,
3296 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
3297 .op_name = "OP_LOOKUPP",
3298 .op_rsize_bop = nfsd4_only_status_rsize,
3299 },
3300 [OP_NVERIFY] = {
3301 .op_func = nfsd4_nverify,
3302 .op_name = "OP_NVERIFY",
3303 .op_rsize_bop = nfsd4_only_status_rsize,
3304 },
3305 [OP_OPEN] = {
3306 .op_func = nfsd4_open,
3307 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
3308 .op_name = "OP_OPEN",
3309 .op_rsize_bop = nfsd4_open_rsize,
3310 .op_set_currentstateid = nfsd4_set_openstateid,
3311 },
3312 [OP_OPEN_CONFIRM] = {
3313 .op_func = nfsd4_open_confirm,
3314 .op_flags = OP_MODIFIES_SOMETHING,
3315 .op_name = "OP_OPEN_CONFIRM",
3316 .op_rsize_bop = nfsd4_status_stateid_rsize,
3317 },
3318 [OP_OPEN_DOWNGRADE] = {
3319 .op_func = nfsd4_open_downgrade,
3320 .op_flags = OP_MODIFIES_SOMETHING,
3321 .op_name = "OP_OPEN_DOWNGRADE",
3322 .op_rsize_bop = nfsd4_status_stateid_rsize,
3323 .op_get_currentstateid = nfsd4_get_opendowngradestateid,
3324 .op_set_currentstateid = nfsd4_set_opendowngradestateid,
3325 },
3326 [OP_PUTFH] = {
3327 .op_func = nfsd4_putfh,
3328 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3329 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
3330 .op_name = "OP_PUTFH",
3331 .op_rsize_bop = nfsd4_only_status_rsize,
3332 },
3333 [OP_PUTPUBFH] = {
3334 .op_func = nfsd4_putrootfh,
3335 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3336 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
3337 .op_name = "OP_PUTPUBFH",
3338 .op_rsize_bop = nfsd4_only_status_rsize,
3339 },
3340 [OP_PUTROOTFH] = {
3341 .op_func = nfsd4_putrootfh,
3342 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3343 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
3344 .op_name = "OP_PUTROOTFH",
3345 .op_rsize_bop = nfsd4_only_status_rsize,
3346 },
3347 [OP_READ] = {
3348 .op_func = nfsd4_read,
3349 .op_release = nfsd4_read_release,
3350 .op_name = "OP_READ",
3351 .op_rsize_bop = nfsd4_read_rsize,
3352 .op_get_currentstateid = nfsd4_get_readstateid,
3353 },
3354 [OP_READDIR] = {
3355 .op_func = nfsd4_readdir,
3356 .op_name = "OP_READDIR",
3357 .op_rsize_bop = nfsd4_readdir_rsize,
3358 },
3359 [OP_READLINK] = {
3360 .op_func = nfsd4_readlink,
3361 .op_name = "OP_READLINK",
3362 .op_rsize_bop = nfsd4_readlink_rsize,
3363 },
3364 [OP_REMOVE] = {
3365 .op_func = nfsd4_remove,
3366 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
3367 .op_name = "OP_REMOVE",
3368 .op_rsize_bop = nfsd4_remove_rsize,
3369 },
3370 [OP_RENAME] = {
3371 .op_func = nfsd4_rename,
3372 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
3373 .op_name = "OP_RENAME",
3374 .op_rsize_bop = nfsd4_rename_rsize,
3375 },
3376 [OP_RENEW] = {
3377 .op_func = nfsd4_renew,
3378 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3379 | OP_MODIFIES_SOMETHING,
3380 .op_name = "OP_RENEW",
3381 .op_rsize_bop = nfsd4_only_status_rsize,
3382
3383 },
3384 [OP_RESTOREFH] = {
3385 .op_func = nfsd4_restorefh,
3386 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3387 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
3388 .op_name = "OP_RESTOREFH",
3389 .op_rsize_bop = nfsd4_only_status_rsize,
3390 },
3391 [OP_SAVEFH] = {
3392 .op_func = nfsd4_savefh,
3393 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
3394 .op_name = "OP_SAVEFH",
3395 .op_rsize_bop = nfsd4_only_status_rsize,
3396 },
3397 [OP_SECINFO] = {
3398 .op_func = nfsd4_secinfo,
3399 .op_release = nfsd4_secinfo_release,
3400 .op_flags = OP_HANDLES_WRONGSEC,
3401 .op_name = "OP_SECINFO",
3402 .op_rsize_bop = nfsd4_secinfo_rsize,
3403 },
3404 [OP_SETATTR] = {
3405 .op_func = nfsd4_setattr,
3406 .op_name = "OP_SETATTR",
3407 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME
3408 | OP_NONTRIVIAL_ERROR_ENCODE,
3409 .op_rsize_bop = nfsd4_setattr_rsize,
3410 .op_get_currentstateid = nfsd4_get_setattrstateid,
3411 },
3412 [OP_SETCLIENTID] = {
3413 .op_func = nfsd4_setclientid,
3414 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3415 | OP_MODIFIES_SOMETHING | OP_CACHEME
3416 | OP_NONTRIVIAL_ERROR_ENCODE,
3417 .op_name = "OP_SETCLIENTID",
3418 .op_rsize_bop = nfsd4_setclientid_rsize,
3419 },
3420 [OP_SETCLIENTID_CONFIRM] = {
3421 .op_func = nfsd4_setclientid_confirm,
3422 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3423 | OP_MODIFIES_SOMETHING | OP_CACHEME,
3424 .op_name = "OP_SETCLIENTID_CONFIRM",
3425 .op_rsize_bop = nfsd4_only_status_rsize,
3426 },
3427 [OP_VERIFY] = {
3428 .op_func = nfsd4_verify,
3429 .op_name = "OP_VERIFY",
3430 .op_rsize_bop = nfsd4_only_status_rsize,
3431 },
3432 [OP_WRITE] = {
3433 .op_func = nfsd4_write,
3434 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
3435 .op_name = "OP_WRITE",
3436 .op_rsize_bop = nfsd4_write_rsize,
3437 .op_get_currentstateid = nfsd4_get_writestateid,
3438 },
3439 [OP_RELEASE_LOCKOWNER] = {
3440 .op_func = nfsd4_release_lockowner,
3441 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3442 | OP_MODIFIES_SOMETHING,
3443 .op_name = "OP_RELEASE_LOCKOWNER",
3444 .op_rsize_bop = nfsd4_only_status_rsize,
3445 },
3446
3447 /* NFSv4.1 operations */
3448 [OP_EXCHANGE_ID] = {
3449 .op_func = nfsd4_exchange_id,
3450 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
3451 | OP_MODIFIES_SOMETHING,
3452 .op_name = "OP_EXCHANGE_ID",
3453 .op_rsize_bop = nfsd4_exchange_id_rsize,
3454 },
3455 [OP_BACKCHANNEL_CTL] = {
3456 .op_func = nfsd4_backchannel_ctl,
3457 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
3458 .op_name = "OP_BACKCHANNEL_CTL",
3459 .op_rsize_bop = nfsd4_only_status_rsize,
3460 },
3461 [OP_BIND_CONN_TO_SESSION] = {
3462 .op_func = nfsd4_bind_conn_to_session,
3463 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
3464 | OP_MODIFIES_SOMETHING,
3465 .op_name = "OP_BIND_CONN_TO_SESSION",
3466 .op_rsize_bop = nfsd4_bind_conn_to_session_rsize,
3467 },
3468 [OP_CREATE_SESSION] = {
3469 .op_func = nfsd4_create_session,
3470 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
3471 | OP_MODIFIES_SOMETHING,
3472 .op_name = "OP_CREATE_SESSION",
3473 .op_rsize_bop = nfsd4_create_session_rsize,
3474 },
3475 [OP_DESTROY_SESSION] = {
3476 .op_func = nfsd4_destroy_session,
3477 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
3478 | OP_MODIFIES_SOMETHING,
3479 .op_name = "OP_DESTROY_SESSION",
3480 .op_rsize_bop = nfsd4_only_status_rsize,
3481 },
3482 [OP_SEQUENCE] = {
3483 .op_func = nfsd4_sequence,
3484 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
3485 .op_name = "OP_SEQUENCE",
3486 .op_rsize_bop = nfsd4_sequence_rsize,
3487 },
3488 [OP_DESTROY_CLIENTID] = {
3489 .op_func = nfsd4_destroy_clientid,
3490 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
3491 | OP_MODIFIES_SOMETHING,
3492 .op_name = "OP_DESTROY_CLIENTID",
3493 .op_rsize_bop = nfsd4_only_status_rsize,
3494 },
3495 [OP_RECLAIM_COMPLETE] = {
3496 .op_func = nfsd4_reclaim_complete,
3497 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
3498 .op_name = "OP_RECLAIM_COMPLETE",
3499 .op_rsize_bop = nfsd4_only_status_rsize,
3500 },
3501 [OP_SECINFO_NO_NAME] = {
3502 .op_func = nfsd4_secinfo_no_name,
3503 .op_release = nfsd4_secinfo_no_name_release,
3504 .op_flags = OP_HANDLES_WRONGSEC,
3505 .op_name = "OP_SECINFO_NO_NAME",
3506 .op_rsize_bop = nfsd4_secinfo_rsize,
3507 },
3508 [OP_TEST_STATEID] = {
3509 .op_func = nfsd4_test_stateid,
3510 .op_flags = ALLOWED_WITHOUT_FH,
3511 .op_name = "OP_TEST_STATEID",
3512 .op_rsize_bop = nfsd4_test_stateid_rsize,
3513 },
3514 [OP_FREE_STATEID] = {
3515 .op_func = nfsd4_free_stateid,
3516 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
3517 .op_name = "OP_FREE_STATEID",
3518 .op_get_currentstateid = nfsd4_get_freestateid,
3519 .op_rsize_bop = nfsd4_only_status_rsize,
3520 },
3521 [OP_GET_DIR_DELEGATION] = {
3522 .op_func = nfsd4_get_dir_delegation,
3523 .op_flags = OP_MODIFIES_SOMETHING,
3524 .op_name = "OP_GET_DIR_DELEGATION",
3525 .op_rsize_bop = nfsd4_get_dir_delegation_rsize,
3526 },
3527 #ifdef CONFIG_NFSD_PNFS
3528 [OP_GETDEVICEINFO] = {
3529 .op_func = nfsd4_getdeviceinfo,
3530 .op_release = nfsd4_getdeviceinfo_release,
3531 .op_flags = ALLOWED_WITHOUT_FH,
3532 .op_name = "OP_GETDEVICEINFO",
3533 .op_rsize_bop = nfsd4_getdeviceinfo_rsize,
3534 },
3535 [OP_LAYOUTGET] = {
3536 .op_func = nfsd4_layoutget,
3537 .op_release = nfsd4_layoutget_release,
3538 .op_flags = OP_MODIFIES_SOMETHING,
3539 .op_name = "OP_LAYOUTGET",
3540 .op_rsize_bop = nfsd4_layoutget_rsize,
3541 },
3542 [OP_LAYOUTCOMMIT] = {
3543 .op_func = nfsd4_layoutcommit,
3544 .op_flags = OP_MODIFIES_SOMETHING,
3545 .op_name = "OP_LAYOUTCOMMIT",
3546 .op_rsize_bop = nfsd4_layoutcommit_rsize,
3547 },
3548 [OP_LAYOUTRETURN] = {
3549 .op_func = nfsd4_layoutreturn,
3550 .op_flags = OP_MODIFIES_SOMETHING,
3551 .op_name = "OP_LAYOUTRETURN",
3552 .op_rsize_bop = nfsd4_layoutreturn_rsize,
3553 },
3554 #endif /* CONFIG_NFSD_PNFS */
3555
3556 /* NFSv4.2 operations */
3557 [OP_ALLOCATE] = {
3558 .op_func = nfsd4_allocate,
3559 .op_flags = OP_MODIFIES_SOMETHING,
3560 .op_name = "OP_ALLOCATE",
3561 .op_rsize_bop = nfsd4_only_status_rsize,
3562 },
3563 [OP_DEALLOCATE] = {
3564 .op_func = nfsd4_deallocate,
3565 .op_flags = OP_MODIFIES_SOMETHING,
3566 .op_name = "OP_DEALLOCATE",
3567 .op_rsize_bop = nfsd4_only_status_rsize,
3568 },
3569 [OP_CLONE] = {
3570 .op_func = nfsd4_clone,
3571 .op_flags = OP_MODIFIES_SOMETHING,
3572 .op_name = "OP_CLONE",
3573 .op_rsize_bop = nfsd4_only_status_rsize,
3574 },
3575 [OP_COPY] = {
3576 .op_func = nfsd4_copy,
3577 .op_flags = OP_MODIFIES_SOMETHING,
3578 .op_name = "OP_COPY",
3579 .op_rsize_bop = nfsd4_copy_rsize,
3580 },
3581 [OP_READ_PLUS] = {
3582 .op_func = nfsd4_read,
3583 .op_release = nfsd4_read_release,
3584 .op_name = "OP_READ_PLUS",
3585 .op_rsize_bop = nfsd4_read_plus_rsize,
3586 .op_get_currentstateid = nfsd4_get_readstateid,
3587 },
3588 [OP_SEEK] = {
3589 .op_func = nfsd4_seek,
3590 .op_name = "OP_SEEK",
3591 .op_rsize_bop = nfsd4_seek_rsize,
3592 },
3593 [OP_OFFLOAD_STATUS] = {
3594 .op_func = nfsd4_offload_status,
3595 .op_name = "OP_OFFLOAD_STATUS",
3596 .op_rsize_bop = nfsd4_offload_status_rsize,
3597 },
3598 [OP_OFFLOAD_CANCEL] = {
3599 .op_func = nfsd4_offload_cancel,
3600 .op_flags = OP_MODIFIES_SOMETHING,
3601 .op_name = "OP_OFFLOAD_CANCEL",
3602 .op_rsize_bop = nfsd4_only_status_rsize,
3603 },
3604 [OP_COPY_NOTIFY] = {
3605 .op_func = nfsd4_copy_notify,
3606 .op_flags = OP_MODIFIES_SOMETHING,
3607 .op_name = "OP_COPY_NOTIFY",
3608 .op_rsize_bop = nfsd4_copy_notify_rsize,
3609 },
3610 [OP_GETXATTR] = {
3611 .op_func = nfsd4_getxattr,
3612 .op_name = "OP_GETXATTR",
3613 .op_rsize_bop = nfsd4_getxattr_rsize,
3614 },
3615 [OP_SETXATTR] = {
3616 .op_func = nfsd4_setxattr,
3617 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
3618 .op_name = "OP_SETXATTR",
3619 .op_rsize_bop = nfsd4_setxattr_rsize,
3620 },
3621 [OP_LISTXATTRS] = {
3622 .op_func = nfsd4_listxattrs,
3623 .op_name = "OP_LISTXATTRS",
3624 .op_rsize_bop = nfsd4_listxattrs_rsize,
3625 },
3626 [OP_REMOVEXATTR] = {
3627 .op_func = nfsd4_removexattr,
3628 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
3629 .op_name = "OP_REMOVEXATTR",
3630 .op_rsize_bop = nfsd4_removexattr_rsize,
3631 },
3632 };
3633
3634 /**
3635 * nfsd4_spo_must_allow - Determine if the compound op contains an
3636 * operation that is allowed to be sent with machine credentials
3637 *
3638 * @rqstp: a pointer to the struct svc_rqst
3639 *
3640 * Checks to see if the compound contains a spo_must_allow op
3641 * and confirms that it was sent with the proper machine creds.
3642 */
3643
3644 bool nfsd4_spo_must_allow(struct svc_rqst *rqstp)
3645 {
3646 struct nfsd4_compoundres *resp = rqstp->rq_resp;
3647 struct nfsd4_compoundargs *argp = rqstp->rq_argp;
3648 struct nfsd4_op *this;
3649 struct nfsd4_compound_state *cstate = &resp->cstate;
3650 struct nfs4_op_map *allow = &cstate->clp->cl_spo_must_allow;
3651 u32 opiter;
3652
3653 if (!cstate->minorversion)
3654 return false;
3655
3656 if (cstate->spo_must_allowed)
3657 return true;
3658
3659 opiter = resp->opcnt;
3660 while (opiter < argp->opcnt) {
3661 this = &argp->ops[opiter++];
3662 if (test_bit(this->opnum, allow->u.longs) &&
3663 cstate->clp->cl_mach_cred &&
3664 nfsd4_mach_creds_match(cstate->clp, rqstp)) {
3665 cstate->spo_must_allowed = true;
3666 return true;
3667 }
3668 }
3669 cstate->spo_must_allowed = false;
3670 return false;
3671 }
3672
3673 int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
3674 {
3675 if (op->opnum == OP_ILLEGAL || op->status == nfserr_notsupp)
3676 return op_encode_hdr_size * sizeof(__be32);
3677
3678 BUG_ON(OPDESC(op)->op_rsize_bop == NULL);
3679 return OPDESC(op)->op_rsize_bop(rqstp, op);
3680 }
3681
3682 void warn_on_nonidempotent_op(struct nfsd4_op *op)
3683 {
3684 if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
3685 pr_err("unable to encode reply to nonidempotent op %u (%s)\n",
3686 op->opnum, nfsd4_op_name(op->opnum));
3687 WARN_ON_ONCE(1);
3688 }
3689 }
3690
3691 static const char *nfsd4_op_name(unsigned opnum)
3692 {
3693 if (opnum < ARRAY_SIZE(nfsd4_ops))
3694 return nfsd4_ops[opnum].op_name;
3695 return "unknown_operation";
3696 }
3697
3698 static const struct svc_procedure nfsd_procedures4[2] = {
3699 [NFSPROC4_NULL] = {
3700 .pc_func = nfsd4_proc_null,
3701 .pc_decode = nfssvc_decode_voidarg,
3702 .pc_encode = nfssvc_encode_voidres,
3703 .pc_argsize = sizeof(struct nfsd_voidargs),
3704 .pc_argzero = sizeof(struct nfsd_voidargs),
3705 .pc_ressize = sizeof(struct nfsd_voidres),
3706 .pc_cachetype = RC_NOCACHE,
3707 .pc_xdrressize = 1,
3708 .pc_name = "NULL",
3709 },
3710 [NFSPROC4_COMPOUND] = {
3711 .pc_func = nfsd4_proc_compound,
3712 .pc_decode = nfs4svc_decode_compoundargs,
3713 .pc_encode = nfs4svc_encode_compoundres,
3714 .pc_argsize = sizeof(struct nfsd4_compoundargs),
3715 .pc_argzero = offsetof(struct nfsd4_compoundargs, iops),
3716 .pc_ressize = sizeof(struct nfsd4_compoundres),
3717 .pc_release = nfsd4_release_compoundargs,
3718 .pc_cachetype = RC_NOCACHE,
3719 .pc_xdrressize = NFSD_BUFSIZE/4,
3720 .pc_name = "COMPOUND",
3721 },
3722 };
3723
3724 static DEFINE_PER_CPU_ALIGNED(unsigned long,
3725 nfsd_count4[ARRAY_SIZE(nfsd_procedures4)]);
3726 const struct svc_version nfsd_version4 = {
3727 .vs_vers = 4,
3728 .vs_nproc = ARRAY_SIZE(nfsd_procedures4),
3729 .vs_proc = nfsd_procedures4,
3730 .vs_count = nfsd_count4,
3731 .vs_dispatch = nfsd_dispatch,
3732 .vs_xdrsize = NFS4_SVC_XDRSIZE,
3733 .vs_rpcb_optnl = true,
3734 .vs_need_cong_ctrl = true,
3735 };
3736
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