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1/*
2 * Server-side procedures for NFSv4.
3 *
4 * Copyright (c) 2002 The Regents of the University of Michigan.
5 * All rights reserved.
6 *
7 * Kendrick Smith <kmsmith@umich.edu>
8 * Andy Adamson <andros@umich.edu>
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 *
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its
20 * contributors may be used to endorse or promote products derived
21 * from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35#include <linux/file.h>
36#include <linux/slab.h>
37
38#include "cache.h"
39#include "xdr4.h"
40#include "vfs.h"
41
42#define NFSDDBG_FACILITY NFSDDBG_PROC
43
44static u32 nfsd_attrmask[] = {
45 NFSD_WRITEABLE_ATTRS_WORD0,
46 NFSD_WRITEABLE_ATTRS_WORD1,
47 NFSD_WRITEABLE_ATTRS_WORD2
48};
49
50static u32 nfsd41_ex_attrmask[] = {
51 NFSD_SUPPATTR_EXCLCREAT_WORD0,
52 NFSD_SUPPATTR_EXCLCREAT_WORD1,
53 NFSD_SUPPATTR_EXCLCREAT_WORD2
54};
55
56static __be32
57check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
58 u32 *bmval, u32 *writable)
59{
60 struct dentry *dentry = cstate->current_fh.fh_dentry;
61
62 /*
63 * Check about attributes are supported by the NFSv4 server or not.
64 * According to spec, unsupported attributes return ERR_ATTRNOTSUPP.
65 */
66 if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) ||
67 (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) ||
68 (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
69 return nfserr_attrnotsupp;
70
71 /*
72 * Check FATTR4_WORD0_ACL can be supported
73 * in current environment or not.
74 */
75 if (bmval[0] & FATTR4_WORD0_ACL) {
76 if (!IS_POSIXACL(dentry->d_inode))
77 return nfserr_attrnotsupp;
78 }
79
80 /*
81 * According to spec, read-only attributes return ERR_INVAL.
82 */
83 if (writable) {
84 if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
85 (bmval[2] & ~writable[2]))
86 return nfserr_inval;
87 }
88
89 return nfs_ok;
90}
91
92static __be32
93nfsd4_check_open_attributes(struct svc_rqst *rqstp,
94 struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
95{
96 __be32 status = nfs_ok;
97
98 if (open->op_create == NFS4_OPEN_CREATE) {
99 if (open->op_createmode == NFS4_CREATE_UNCHECKED
100 || open->op_createmode == NFS4_CREATE_GUARDED)
101 status = check_attr_support(rqstp, cstate,
102 open->op_bmval, nfsd_attrmask);
103 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
104 status = check_attr_support(rqstp, cstate,
105 open->op_bmval, nfsd41_ex_attrmask);
106 }
107
108 return status;
109}
110
111static int
112is_create_with_attrs(struct nfsd4_open *open)
113{
114 return open->op_create == NFS4_OPEN_CREATE
115 && (open->op_createmode == NFS4_CREATE_UNCHECKED
116 || open->op_createmode == NFS4_CREATE_GUARDED
117 || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
118}
119
120/*
121 * if error occurs when setting the acl, just clear the acl bit
122 * in the returned attr bitmap.
123 */
124static void
125do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
126 struct nfs4_acl *acl, u32 *bmval)
127{
128 __be32 status;
129
130 status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
131 if (status)
132 /*
133 * We should probably fail the whole open at this point,
134 * but we've already created the file, so it's too late;
135 * So this seems the least of evils:
136 */
137 bmval[0] &= ~FATTR4_WORD0_ACL;
138}
139
140static inline void
141fh_dup2(struct svc_fh *dst, struct svc_fh *src)
142{
143 fh_put(dst);
144 dget(src->fh_dentry);
145 if (src->fh_export)
146 cache_get(&src->fh_export->h);
147 *dst = *src;
148}
149
150static __be32
151do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
152{
153 __be32 status;
154
155 if (open->op_truncate &&
156 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
157 return nfserr_inval;
158
159 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
160 accmode |= NFSD_MAY_READ;
161 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
162 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
163 if (open->op_share_deny & NFS4_SHARE_DENY_READ)
164 accmode |= NFSD_MAY_WRITE;
165
166 status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
167
168 return status;
169}
170
171static __be32
172do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
173{
174 struct svc_fh resfh;
175 __be32 status;
176 int created = 0;
177
178 fh_init(&resfh, NFS4_FHSIZE);
179 open->op_truncate = 0;
180
181 if (open->op_create) {
182 /* FIXME: check session persistence and pnfs flags.
183 * The nfsv4.1 spec requires the following semantics:
184 *
185 * Persistent | pNFS | Server REQUIRED | Client Allowed
186 * Reply Cache | server | |
187 * -------------+--------+-----------------+--------------------
188 * no | no | EXCLUSIVE4_1 | EXCLUSIVE4_1
189 * | | | (SHOULD)
190 * | | and EXCLUSIVE4 | or EXCLUSIVE4
191 * | | | (SHOULD NOT)
192 * no | yes | EXCLUSIVE4_1 | EXCLUSIVE4_1
193 * yes | no | GUARDED4 | GUARDED4
194 * yes | yes | GUARDED4 | GUARDED4
195 */
196
197 /*
198 * Note: create modes (UNCHECKED,GUARDED...) are the same
199 * in NFSv4 as in v3 except EXCLUSIVE4_1.
200 */
201 status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
202 open->op_fname.len, &open->op_iattr,
203 &resfh, open->op_createmode,
204 (u32 *)open->op_verf.data,
205 &open->op_truncate, &created);
206
207 /*
208 * Following rfc 3530 14.2.16, use the returned bitmask
209 * to indicate which attributes we used to store the
210 * verifier:
211 */
212 if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
213 open->op_bmval[1] = (FATTR4_WORD1_TIME_ACCESS |
214 FATTR4_WORD1_TIME_MODIFY);
215 } else {
216 status = nfsd_lookup(rqstp, current_fh,
217 open->op_fname.data, open->op_fname.len, &resfh);
218 fh_unlock(current_fh);
219 }
220 if (status)
221 goto out;
222
223 if (is_create_with_attrs(open) && open->op_acl != NULL)
224 do_set_nfs4_acl(rqstp, &resfh, open->op_acl, open->op_bmval);
225
226 set_change_info(&open->op_cinfo, current_fh);
227 fh_dup2(current_fh, &resfh);
228
229 /* set reply cache */
230 fh_copy_shallow(&open->op_stateowner->so_replay.rp_openfh,
231 &resfh.fh_handle);
232 if (!created)
233 status = do_open_permission(rqstp, current_fh, open,
234 NFSD_MAY_NOP);
235
236out:
237 fh_put(&resfh);
238 return status;
239}
240
241static __be32
242do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
243{
244 __be32 status;
245
246 /* Only reclaims from previously confirmed clients are valid */
247 if ((status = nfs4_check_open_reclaim(&open->op_clientid)))
248 return status;
249
250 /* We don't know the target directory, and therefore can not
251 * set the change info
252 */
253
254 memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
255
256 /* set replay cache */
257 fh_copy_shallow(&open->op_stateowner->so_replay.rp_openfh,
258 ¤t_fh->fh_handle);
259
260 open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
261 (open->op_iattr.ia_size == 0);
262
263 status = do_open_permission(rqstp, current_fh, open,
264 NFSD_MAY_OWNER_OVERRIDE);
265
266 return status;
267}
268
269static void
270copy_clientid(clientid_t *clid, struct nfsd4_session *session)
271{
272 struct nfsd4_sessionid *sid =
273 (struct nfsd4_sessionid *)session->se_sessionid.data;
274
275 clid->cl_boot = sid->clientid.cl_boot;
276 clid->cl_id = sid->clientid.cl_id;
277}
278
279static __be32
280nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
281 struct nfsd4_open *open)
282{
283 __be32 status;
284 struct nfsd4_compoundres *resp;
285
286 dprintk("NFSD: nfsd4_open filename %.*s op_stateowner %p\n",
287 (int)open->op_fname.len, open->op_fname.data,
288 open->op_stateowner);
289
290 /* This check required by spec. */
291 if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
292 return nfserr_inval;
293
294 /*
295 * RFC5661 18.51.3
296 * Before RECLAIM_COMPLETE done, server should deny new lock
297 */
298 if (nfsd4_has_session(cstate) &&
299 !cstate->session->se_client->cl_firststate &&
300 open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
301 return nfserr_grace;
302
303 if (nfsd4_has_session(cstate))
304 copy_clientid(&open->op_clientid, cstate->session);
305
306 nfs4_lock_state();
307
308 /* check seqid for replay. set nfs4_owner */
309 resp = rqstp->rq_resp;
310 status = nfsd4_process_open1(&resp->cstate, open);
311 if (status == nfserr_replay_me) {
312 struct nfs4_replay *rp = &open->op_stateowner->so_replay;
313 fh_put(&cstate->current_fh);
314 fh_copy_shallow(&cstate->current_fh.fh_handle,
315 &rp->rp_openfh);
316 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
317 if (status)
318 dprintk("nfsd4_open: replay failed"
319 " restoring previous filehandle\n");
320 else
321 status = nfserr_replay_me;
322 }
323 if (status)
324 goto out;
325
326 status = nfsd4_check_open_attributes(rqstp, cstate, open);
327 if (status)
328 goto out;
329
330 /* Openowner is now set, so sequence id will get bumped. Now we need
331 * these checks before we do any creates: */
332 status = nfserr_grace;
333 if (locks_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
334 goto out;
335 status = nfserr_no_grace;
336 if (!locks_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
337 goto out;
338
339 switch (open->op_claim_type) {
340 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
341 case NFS4_OPEN_CLAIM_NULL:
342 /*
343 * (1) set CURRENT_FH to the file being opened,
344 * creating it if necessary, (2) set open->op_cinfo,
345 * (3) set open->op_truncate if the file is to be
346 * truncated after opening, (4) do permission checking.
347 */
348 status = do_open_lookup(rqstp, &cstate->current_fh,
349 open);
350 if (status)
351 goto out;
352 break;
353 case NFS4_OPEN_CLAIM_PREVIOUS:
354 open->op_stateowner->so_confirmed = 1;
355 /*
356 * The CURRENT_FH is already set to the file being
357 * opened. (1) set open->op_cinfo, (2) set
358 * open->op_truncate if the file is to be truncated
359 * after opening, (3) do permission checking.
360 */
361 status = do_open_fhandle(rqstp, &cstate->current_fh,
362 open);
363 if (status)
364 goto out;
365 break;
366 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
367 open->op_stateowner->so_confirmed = 1;
368 dprintk("NFSD: unsupported OPEN claim type %d\n",
369 open->op_claim_type);
370 status = nfserr_notsupp;
371 goto out;
372 default:
373 dprintk("NFSD: Invalid OPEN claim type %d\n",
374 open->op_claim_type);
375 status = nfserr_inval;
376 goto out;
377 }
378 /*
379 * nfsd4_process_open2() does the actual opening of the file. If
380 * successful, it (1) truncates the file if open->op_truncate was
381 * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
382 */
383 status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
384out:
385 if (open->op_stateowner) {
386 nfs4_get_stateowner(open->op_stateowner);
387 cstate->replay_owner = open->op_stateowner;
388 }
389 nfs4_unlock_state();
390 return status;
391}
392
393/*
394 * filehandle-manipulating ops.
395 */
396static __be32
397nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
398 struct svc_fh **getfh)
399{
400 if (!cstate->current_fh.fh_dentry)
401 return nfserr_nofilehandle;
402
403 *getfh = &cstate->current_fh;
404 return nfs_ok;
405}
406
407static __be32
408nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
409 struct nfsd4_putfh *putfh)
410{
411 fh_put(&cstate->current_fh);
412 cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
413 memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
414 putfh->pf_fhlen);
415 return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
416}
417
418static __be32
419nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
420 void *arg)
421{
422 __be32 status;
423
424 fh_put(&cstate->current_fh);
425 status = exp_pseudoroot(rqstp, &cstate->current_fh);
426 return status;
427}
428
429static __be32
430nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
431 void *arg)
432{
433 if (!cstate->save_fh.fh_dentry)
434 return nfserr_restorefh;
435
436 fh_dup2(&cstate->current_fh, &cstate->save_fh);
437 return nfs_ok;
438}
439
440static __be32
441nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
442 void *arg)
443{
444 if (!cstate->current_fh.fh_dentry)
445 return nfserr_nofilehandle;
446
447 fh_dup2(&cstate->save_fh, &cstate->current_fh);
448 return nfs_ok;
449}
450
451/*
452 * misc nfsv4 ops
453 */
454static __be32
455nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
456 struct nfsd4_access *access)
457{
458 if (access->ac_req_access & ~NFS3_ACCESS_FULL)
459 return nfserr_inval;
460
461 access->ac_resp_access = access->ac_req_access;
462 return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
463 &access->ac_supported);
464}
465
466static __be32
467nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
468 struct nfsd4_commit *commit)
469{
470 __be32 status;
471
472 u32 *p = (u32 *)commit->co_verf.data;
473 *p++ = nfssvc_boot.tv_sec;
474 *p++ = nfssvc_boot.tv_usec;
475
476 status = nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
477 commit->co_count);
478 if (status == nfserr_symlink)
479 status = nfserr_inval;
480 return status;
481}
482
483static __be32
484nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
485 struct nfsd4_create *create)
486{
487 struct svc_fh resfh;
488 __be32 status;
489 dev_t rdev;
490
491 fh_init(&resfh, NFS4_FHSIZE);
492
493 status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
494 NFSD_MAY_CREATE);
495 if (status == nfserr_symlink)
496 status = nfserr_notdir;
497 if (status)
498 return status;
499
500 status = check_attr_support(rqstp, cstate, create->cr_bmval,
501 nfsd_attrmask);
502 if (status)
503 return status;
504
505 switch (create->cr_type) {
506 case NF4LNK:
507 /* ugh! we have to null-terminate the linktext, or
508 * vfs_symlink() will choke. it is always safe to
509 * null-terminate by brute force, since at worst we
510 * will overwrite the first byte of the create namelen
511 * in the XDR buffer, which has already been extracted
512 * during XDR decode.
513 */
514 create->cr_linkname[create->cr_linklen] = 0;
515
516 status = nfsd_symlink(rqstp, &cstate->current_fh,
517 create->cr_name, create->cr_namelen,
518 create->cr_linkname, create->cr_linklen,
519 &resfh, &create->cr_iattr);
520 break;
521
522 case NF4BLK:
523 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
524 if (MAJOR(rdev) != create->cr_specdata1 ||
525 MINOR(rdev) != create->cr_specdata2)
526 return nfserr_inval;
527 status = nfsd_create(rqstp, &cstate->current_fh,
528 create->cr_name, create->cr_namelen,
529 &create->cr_iattr, S_IFBLK, rdev, &resfh);
530 break;
531
532 case NF4CHR:
533 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
534 if (MAJOR(rdev) != create->cr_specdata1 ||
535 MINOR(rdev) != create->cr_specdata2)
536 return nfserr_inval;
537 status = nfsd_create(rqstp, &cstate->current_fh,
538 create->cr_name, create->cr_namelen,
539 &create->cr_iattr,S_IFCHR, rdev, &resfh);
540 break;
541
542 case NF4SOCK:
543 status = nfsd_create(rqstp, &cstate->current_fh,
544 create->cr_name, create->cr_namelen,
545 &create->cr_iattr, S_IFSOCK, 0, &resfh);
546 break;
547
548 case NF4FIFO:
549 status = nfsd_create(rqstp, &cstate->current_fh,
550 create->cr_name, create->cr_namelen,
551 &create->cr_iattr, S_IFIFO, 0, &resfh);
552 break;
553
554 case NF4DIR:
555 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
556 status = nfsd_create(rqstp, &cstate->current_fh,
557 create->cr_name, create->cr_namelen,
558 &create->cr_iattr, S_IFDIR, 0, &resfh);
559 break;
560
561 default:
562 status = nfserr_badtype;
563 }
564
565 if (status)
566 goto out;
567
568 if (create->cr_acl != NULL)
569 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
570 create->cr_bmval);
571
572 fh_unlock(&cstate->current_fh);
573 set_change_info(&create->cr_cinfo, &cstate->current_fh);
574 fh_dup2(&cstate->current_fh, &resfh);
575out:
576 fh_put(&resfh);
577 return status;
578}
579
580static __be32
581nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
582 struct nfsd4_getattr *getattr)
583{
584 __be32 status;
585
586 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
587 if (status)
588 return status;
589
590 if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
591 return nfserr_inval;
592
593 getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
594 getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
595 getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
596
597 getattr->ga_fhp = &cstate->current_fh;
598 return nfs_ok;
599}
600
601static __be32
602nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
603 struct nfsd4_link *link)
604{
605 __be32 status = nfserr_nofilehandle;
606
607 if (!cstate->save_fh.fh_dentry)
608 return status;
609 status = nfsd_link(rqstp, &cstate->current_fh,
610 link->li_name, link->li_namelen, &cstate->save_fh);
611 if (!status)
612 set_change_info(&link->li_cinfo, &cstate->current_fh);
613 return status;
614}
615
616static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
617{
618 struct svc_fh tmp_fh;
619 __be32 ret;
620
621 fh_init(&tmp_fh, NFS4_FHSIZE);
622 ret = exp_pseudoroot(rqstp, &tmp_fh);
623 if (ret)
624 return ret;
625 if (tmp_fh.fh_dentry == fh->fh_dentry) {
626 fh_put(&tmp_fh);
627 return nfserr_noent;
628 }
629 fh_put(&tmp_fh);
630 return nfsd_lookup(rqstp, fh, "..", 2, fh);
631}
632
633static __be32
634nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
635 void *arg)
636{
637 return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
638}
639
640static __be32
641nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
642 struct nfsd4_lookup *lookup)
643{
644 return nfsd_lookup(rqstp, &cstate->current_fh,
645 lookup->lo_name, lookup->lo_len,
646 &cstate->current_fh);
647}
648
649static __be32
650nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
651 struct nfsd4_read *read)
652{
653 __be32 status;
654
655 /* no need to check permission - this will be done in nfsd_read() */
656
657 read->rd_filp = NULL;
658 if (read->rd_offset >= OFFSET_MAX)
659 return nfserr_inval;
660
661 nfs4_lock_state();
662 /* check stateid */
663 if ((status = nfs4_preprocess_stateid_op(cstate, &read->rd_stateid,
664 RD_STATE, &read->rd_filp))) {
665 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
666 goto out;
667 }
668 if (read->rd_filp)
669 get_file(read->rd_filp);
670 status = nfs_ok;
671out:
672 nfs4_unlock_state();
673 read->rd_rqstp = rqstp;
674 read->rd_fhp = &cstate->current_fh;
675 return status;
676}
677
678static __be32
679nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
680 struct nfsd4_readdir *readdir)
681{
682 u64 cookie = readdir->rd_cookie;
683 static const nfs4_verifier zeroverf;
684
685 /* no need to check permission - this will be done in nfsd_readdir() */
686
687 if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
688 return nfserr_inval;
689
690 readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
691 readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
692 readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
693
694 if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) ||
695 (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
696 return nfserr_bad_cookie;
697
698 readdir->rd_rqstp = rqstp;
699 readdir->rd_fhp = &cstate->current_fh;
700 return nfs_ok;
701}
702
703static __be32
704nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
705 struct nfsd4_readlink *readlink)
706{
707 readlink->rl_rqstp = rqstp;
708 readlink->rl_fhp = &cstate->current_fh;
709 return nfs_ok;
710}
711
712static __be32
713nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
714 struct nfsd4_remove *remove)
715{
716 __be32 status;
717
718 if (locks_in_grace())
719 return nfserr_grace;
720 status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
721 remove->rm_name, remove->rm_namelen);
722 if (status == nfserr_symlink)
723 return nfserr_notdir;
724 if (!status) {
725 fh_unlock(&cstate->current_fh);
726 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
727 }
728 return status;
729}
730
731static __be32
732nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
733 struct nfsd4_rename *rename)
734{
735 __be32 status = nfserr_nofilehandle;
736
737 if (!cstate->save_fh.fh_dentry)
738 return status;
739 if (locks_in_grace() && !(cstate->save_fh.fh_export->ex_flags
740 & NFSEXP_NOSUBTREECHECK))
741 return nfserr_grace;
742 status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
743 rename->rn_snamelen, &cstate->current_fh,
744 rename->rn_tname, rename->rn_tnamelen);
745
746 /* the underlying filesystem returns different error's than required
747 * by NFSv4. both save_fh and current_fh have been verified.. */
748 if (status == nfserr_isdir)
749 status = nfserr_exist;
750 else if ((status == nfserr_notdir) &&
751 (S_ISDIR(cstate->save_fh.fh_dentry->d_inode->i_mode) &&
752 S_ISDIR(cstate->current_fh.fh_dentry->d_inode->i_mode)))
753 status = nfserr_exist;
754 else if (status == nfserr_symlink)
755 status = nfserr_notdir;
756
757 if (!status) {
758 set_change_info(&rename->rn_sinfo, &cstate->current_fh);
759 set_change_info(&rename->rn_tinfo, &cstate->save_fh);
760 }
761 return status;
762}
763
764static __be32
765nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
766 struct nfsd4_secinfo *secinfo)
767{
768 struct svc_fh resfh;
769 struct svc_export *exp;
770 struct dentry *dentry;
771 __be32 err;
772
773 fh_init(&resfh, NFS4_FHSIZE);
774 err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
775 if (err)
776 return err;
777 err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
778 secinfo->si_name, secinfo->si_namelen,
779 &exp, &dentry);
780 if (err)
781 return err;
782 if (dentry->d_inode == NULL) {
783 exp_put(exp);
784 err = nfserr_noent;
785 } else
786 secinfo->si_exp = exp;
787 dput(dentry);
788 if (cstate->minorversion)
789 /* See rfc 5661 section 2.6.3.1.1.8 */
790 fh_put(&cstate->current_fh);
791 return err;
792}
793
794static __be32
795nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
796 struct nfsd4_secinfo_no_name *sin)
797{
798 __be32 err;
799
800 switch (sin->sin_style) {
801 case NFS4_SECINFO_STYLE4_CURRENT_FH:
802 break;
803 case NFS4_SECINFO_STYLE4_PARENT:
804 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
805 if (err)
806 return err;
807 break;
808 default:
809 return nfserr_inval;
810 }
811 exp_get(cstate->current_fh.fh_export);
812 sin->sin_exp = cstate->current_fh.fh_export;
813 fh_put(&cstate->current_fh);
814 return nfs_ok;
815}
816
817static __be32
818nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
819 struct nfsd4_setattr *setattr)
820{
821 __be32 status = nfs_ok;
822
823 if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
824 nfs4_lock_state();
825 status = nfs4_preprocess_stateid_op(cstate,
826 &setattr->sa_stateid, WR_STATE, NULL);
827 nfs4_unlock_state();
828 if (status) {
829 dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
830 return status;
831 }
832 }
833 status = mnt_want_write(cstate->current_fh.fh_export->ex_path.mnt);
834 if (status)
835 return status;
836 status = nfs_ok;
837
838 status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
839 nfsd_attrmask);
840 if (status)
841 goto out;
842
843 if (setattr->sa_acl != NULL)
844 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
845 setattr->sa_acl);
846 if (status)
847 goto out;
848 status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
849 0, (time_t)0);
850out:
851 mnt_drop_write(cstate->current_fh.fh_export->ex_path.mnt);
852 return status;
853}
854
855static __be32
856nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
857 struct nfsd4_write *write)
858{
859 stateid_t *stateid = &write->wr_stateid;
860 struct file *filp = NULL;
861 u32 *p;
862 __be32 status = nfs_ok;
863 unsigned long cnt;
864
865 /* no need to check permission - this will be done in nfsd_write() */
866
867 if (write->wr_offset >= OFFSET_MAX)
868 return nfserr_inval;
869
870 nfs4_lock_state();
871 status = nfs4_preprocess_stateid_op(cstate, stateid, WR_STATE, &filp);
872 if (filp)
873 get_file(filp);
874 nfs4_unlock_state();
875
876 if (status) {
877 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
878 return status;
879 }
880
881 cnt = write->wr_buflen;
882 write->wr_how_written = write->wr_stable_how;
883 p = (u32 *)write->wr_verifier.data;
884 *p++ = nfssvc_boot.tv_sec;
885 *p++ = nfssvc_boot.tv_usec;
886
887 status = nfsd_write(rqstp, &cstate->current_fh, filp,
888 write->wr_offset, rqstp->rq_vec, write->wr_vlen,
889 &cnt, &write->wr_how_written);
890 if (filp)
891 fput(filp);
892
893 write->wr_bytes_written = cnt;
894
895 if (status == nfserr_symlink)
896 status = nfserr_inval;
897 return status;
898}
899
900/* This routine never returns NFS_OK! If there are no other errors, it
901 * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
902 * attributes matched. VERIFY is implemented by mapping NFSERR_SAME
903 * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
904 */
905static __be32
906_nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
907 struct nfsd4_verify *verify)
908{
909 __be32 *buf, *p;
910 int count;
911 __be32 status;
912
913 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
914 if (status)
915 return status;
916
917 status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
918 if (status)
919 return status;
920
921 if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
922 || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
923 return nfserr_inval;
924 if (verify->ve_attrlen & 3)
925 return nfserr_inval;
926
927 /* count in words:
928 * bitmap_len(1) + bitmap(2) + attr_len(1) = 4
929 */
930 count = 4 + (verify->ve_attrlen >> 2);
931 buf = kmalloc(count << 2, GFP_KERNEL);
932 if (!buf)
933 return nfserr_resource;
934
935 status = nfsd4_encode_fattr(&cstate->current_fh,
936 cstate->current_fh.fh_export,
937 cstate->current_fh.fh_dentry, buf,
938 &count, verify->ve_bmval,
939 rqstp, 0);
940
941 /* this means that nfsd4_encode_fattr() ran out of space */
942 if (status == nfserr_resource && count == 0)
943 status = nfserr_not_same;
944 if (status)
945 goto out_kfree;
946
947 /* skip bitmap */
948 p = buf + 1 + ntohl(buf[0]);
949 status = nfserr_not_same;
950 if (ntohl(*p++) != verify->ve_attrlen)
951 goto out_kfree;
952 if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
953 status = nfserr_same;
954
955out_kfree:
956 kfree(buf);
957 return status;
958}
959
960static __be32
961nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
962 struct nfsd4_verify *verify)
963{
964 __be32 status;
965
966 status = _nfsd4_verify(rqstp, cstate, verify);
967 return status == nfserr_not_same ? nfs_ok : status;
968}
969
970static __be32
971nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
972 struct nfsd4_verify *verify)
973{
974 __be32 status;
975
976 status = _nfsd4_verify(rqstp, cstate, verify);
977 return status == nfserr_same ? nfs_ok : status;
978}
979
980/*
981 * NULL call.
982 */
983static __be32
984nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
985{
986 return nfs_ok;
987}
988
989static inline void nfsd4_increment_op_stats(u32 opnum)
990{
991 if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
992 nfsdstats.nfs4_opcount[opnum]++;
993}
994
995typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
996 void *);
997enum nfsd4_op_flags {
998 ALLOWED_WITHOUT_FH = 1 << 0, /* No current filehandle required */
999 ALLOWED_ON_ABSENT_FS = 1 << 1, /* ops processed on absent fs */
1000 ALLOWED_AS_FIRST_OP = 1 << 2, /* ops reqired first in compound */
1001 /* For rfc 5661 section 2.6.3.1.1: */
1002 OP_HANDLES_WRONGSEC = 1 << 3,
1003 OP_IS_PUTFH_LIKE = 1 << 4,
1004};
1005
1006struct nfsd4_operation {
1007 nfsd4op_func op_func;
1008 u32 op_flags;
1009 char *op_name;
1010 /*
1011 * We use the DRC for compounds containing non-idempotent
1012 * operations, *except* those that are 4.1-specific (since
1013 * sessions provide their own EOS), and except for stateful
1014 * operations other than setclientid and setclientid_confirm
1015 * (since sequence numbers provide EOS for open, lock, etc in
1016 * the v4.0 case).
1017 */
1018 bool op_cacheresult;
1019};
1020
1021static struct nfsd4_operation nfsd4_ops[];
1022
1023static const char *nfsd4_op_name(unsigned opnum);
1024
1025/*
1026 * Enforce NFSv4.1 COMPOUND ordering rules:
1027 *
1028 * Also note, enforced elsewhere:
1029 * - SEQUENCE other than as first op results in
1030 * NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1031 * - BIND_CONN_TO_SESSION must be the only op in its compound.
1032 * (Enforced in nfsd4_bind_conn_to_session().)
1033 * - DESTROY_SESSION must be the final operation in a compound, if
1034 * sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1035 * (Enforced in nfsd4_destroy_session().)
1036 */
1037static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1038{
1039 struct nfsd4_op *op = &args->ops[0];
1040
1041 /* These ordering requirements don't apply to NFSv4.0: */
1042 if (args->minorversion == 0)
1043 return nfs_ok;
1044 /* This is weird, but OK, not our problem: */
1045 if (args->opcnt == 0)
1046 return nfs_ok;
1047 if (op->status == nfserr_op_illegal)
1048 return nfs_ok;
1049 if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1050 return nfserr_op_not_in_session;
1051 if (op->opnum == OP_SEQUENCE)
1052 return nfs_ok;
1053 if (args->opcnt != 1)
1054 return nfserr_not_only_op;
1055 return nfs_ok;
1056}
1057
1058static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1059{
1060 return &nfsd4_ops[op->opnum];
1061}
1062
1063bool nfsd4_cache_this_op(struct nfsd4_op *op)
1064{
1065 return OPDESC(op)->op_cacheresult;
1066}
1067
1068static bool need_wrongsec_check(struct svc_rqst *rqstp)
1069{
1070 struct nfsd4_compoundres *resp = rqstp->rq_resp;
1071 struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1072 struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1073 struct nfsd4_op *next = &argp->ops[resp->opcnt];
1074 struct nfsd4_operation *thisd;
1075 struct nfsd4_operation *nextd;
1076
1077 thisd = OPDESC(this);
1078 /*
1079 * Most ops check wronsec on our own; only the putfh-like ops
1080 * have special rules.
1081 */
1082 if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1083 return false;
1084 /*
1085 * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1086 * put-filehandle operation if we're not going to use the
1087 * result:
1088 */
1089 if (argp->opcnt == resp->opcnt)
1090 return false;
1091
1092 nextd = OPDESC(next);
1093 /*
1094 * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1095 * errors themselves as necessary; others should check for them
1096 * now:
1097 */
1098 return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1099}
1100
1101/*
1102 * COMPOUND call.
1103 */
1104static __be32
1105nfsd4_proc_compound(struct svc_rqst *rqstp,
1106 struct nfsd4_compoundargs *args,
1107 struct nfsd4_compoundres *resp)
1108{
1109 struct nfsd4_op *op;
1110 struct nfsd4_operation *opdesc;
1111 struct nfsd4_compound_state *cstate = &resp->cstate;
1112 int slack_bytes;
1113 __be32 status;
1114
1115 resp->xbuf = &rqstp->rq_res;
1116 resp->p = rqstp->rq_res.head[0].iov_base +
1117 rqstp->rq_res.head[0].iov_len;
1118 resp->tagp = resp->p;
1119 /* reserve space for: taglen, tag, and opcnt */
1120 resp->p += 2 + XDR_QUADLEN(args->taglen);
1121 resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
1122 resp->taglen = args->taglen;
1123 resp->tag = args->tag;
1124 resp->opcnt = 0;
1125 resp->rqstp = rqstp;
1126 resp->cstate.minorversion = args->minorversion;
1127 resp->cstate.replay_owner = NULL;
1128 resp->cstate.session = NULL;
1129 fh_init(&resp->cstate.current_fh, NFS4_FHSIZE);
1130 fh_init(&resp->cstate.save_fh, NFS4_FHSIZE);
1131 /*
1132 * Don't use the deferral mechanism for NFSv4; compounds make it
1133 * too hard to avoid non-idempotency problems.
1134 */
1135 rqstp->rq_usedeferral = 0;
1136
1137 /*
1138 * According to RFC3010, this takes precedence over all other errors.
1139 */
1140 status = nfserr_minor_vers_mismatch;
1141 if (args->minorversion > nfsd_supported_minorversion)
1142 goto out;
1143
1144 status = nfs41_check_op_ordering(args);
1145 if (status) {
1146 op = &args->ops[0];
1147 op->status = status;
1148 goto encode_op;
1149 }
1150
1151 while (!status && resp->opcnt < args->opcnt) {
1152 op = &args->ops[resp->opcnt++];
1153
1154 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1155 resp->opcnt, args->opcnt, op->opnum,
1156 nfsd4_op_name(op->opnum));
1157 /*
1158 * The XDR decode routines may have pre-set op->status;
1159 * for example, if there is a miscellaneous XDR error
1160 * it will be set to nfserr_bad_xdr.
1161 */
1162 if (op->status)
1163 goto encode_op;
1164
1165 /* We must be able to encode a successful response to
1166 * this operation, with enough room left over to encode a
1167 * failed response to the next operation. If we don't
1168 * have enough room, fail with ERR_RESOURCE.
1169 */
1170 slack_bytes = (char *)resp->end - (char *)resp->p;
1171 if (slack_bytes < COMPOUND_SLACK_SPACE
1172 + COMPOUND_ERR_SLACK_SPACE) {
1173 BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
1174 op->status = nfserr_resource;
1175 goto encode_op;
1176 }
1177
1178 opdesc = OPDESC(op);
1179
1180 if (!cstate->current_fh.fh_dentry) {
1181 if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1182 op->status = nfserr_nofilehandle;
1183 goto encode_op;
1184 }
1185 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
1186 !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1187 op->status = nfserr_moved;
1188 goto encode_op;
1189 }
1190
1191 if (opdesc->op_func)
1192 op->status = opdesc->op_func(rqstp, cstate, &op->u);
1193 else
1194 BUG_ON(op->status == nfs_ok);
1195
1196 if (!op->status && need_wrongsec_check(rqstp))
1197 op->status = check_nfsd_access(cstate->current_fh.fh_export, rqstp);
1198
1199encode_op:
1200 /* Only from SEQUENCE */
1201 if (resp->cstate.status == nfserr_replay_cache) {
1202 dprintk("%s NFS4.1 replay from cache\n", __func__);
1203 status = op->status;
1204 goto out;
1205 }
1206 if (op->status == nfserr_replay_me) {
1207 op->replay = &cstate->replay_owner->so_replay;
1208 nfsd4_encode_replay(resp, op);
1209 status = op->status = op->replay->rp_status;
1210 } else {
1211 nfsd4_encode_operation(resp, op);
1212 status = op->status;
1213 }
1214
1215 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1216 args->ops, args->opcnt, resp->opcnt, op->opnum,
1217 be32_to_cpu(status));
1218
1219 if (cstate->replay_owner) {
1220 nfs4_put_stateowner(cstate->replay_owner);
1221 cstate->replay_owner = NULL;
1222 }
1223 /* XXX Ugh, we need to get rid of this kind of special case: */
1224 if (op->opnum == OP_READ && op->u.read.rd_filp)
1225 fput(op->u.read.rd_filp);
1226
1227 nfsd4_increment_op_stats(op->opnum);
1228 }
1229
1230 resp->cstate.status = status;
1231 fh_put(&resp->cstate.current_fh);
1232 fh_put(&resp->cstate.save_fh);
1233 BUG_ON(resp->cstate.replay_owner);
1234out:
1235 /* Reset deferral mechanism for RPC deferrals */
1236 rqstp->rq_usedeferral = 1;
1237 dprintk("nfsv4 compound returned %d\n", ntohl(status));
1238 return status;
1239}
1240
1241static struct nfsd4_operation nfsd4_ops[] = {
1242 [OP_ACCESS] = {
1243 .op_func = (nfsd4op_func)nfsd4_access,
1244 .op_name = "OP_ACCESS",
1245 },
1246 [OP_CLOSE] = {
1247 .op_func = (nfsd4op_func)nfsd4_close,
1248 .op_name = "OP_CLOSE",
1249 },
1250 [OP_COMMIT] = {
1251 .op_func = (nfsd4op_func)nfsd4_commit,
1252 .op_name = "OP_COMMIT",
1253 },
1254 [OP_CREATE] = {
1255 .op_func = (nfsd4op_func)nfsd4_create,
1256 .op_name = "OP_CREATE",
1257 .op_cacheresult = true,
1258 },
1259 [OP_DELEGRETURN] = {
1260 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1261 .op_name = "OP_DELEGRETURN",
1262 },
1263 [OP_GETATTR] = {
1264 .op_func = (nfsd4op_func)nfsd4_getattr,
1265 .op_flags = ALLOWED_ON_ABSENT_FS,
1266 .op_name = "OP_GETATTR",
1267 },
1268 [OP_GETFH] = {
1269 .op_func = (nfsd4op_func)nfsd4_getfh,
1270 .op_name = "OP_GETFH",
1271 },
1272 [OP_LINK] = {
1273 .op_func = (nfsd4op_func)nfsd4_link,
1274 .op_name = "OP_LINK",
1275 .op_cacheresult = true,
1276 },
1277 [OP_LOCK] = {
1278 .op_func = (nfsd4op_func)nfsd4_lock,
1279 .op_name = "OP_LOCK",
1280 },
1281 [OP_LOCKT] = {
1282 .op_func = (nfsd4op_func)nfsd4_lockt,
1283 .op_name = "OP_LOCKT",
1284 },
1285 [OP_LOCKU] = {
1286 .op_func = (nfsd4op_func)nfsd4_locku,
1287 .op_name = "OP_LOCKU",
1288 },
1289 [OP_LOOKUP] = {
1290 .op_func = (nfsd4op_func)nfsd4_lookup,
1291 .op_flags = OP_HANDLES_WRONGSEC,
1292 .op_name = "OP_LOOKUP",
1293 },
1294 [OP_LOOKUPP] = {
1295 .op_func = (nfsd4op_func)nfsd4_lookupp,
1296 .op_flags = OP_HANDLES_WRONGSEC,
1297 .op_name = "OP_LOOKUPP",
1298 },
1299 [OP_NVERIFY] = {
1300 .op_func = (nfsd4op_func)nfsd4_nverify,
1301 .op_name = "OP_NVERIFY",
1302 },
1303 [OP_OPEN] = {
1304 .op_func = (nfsd4op_func)nfsd4_open,
1305 .op_flags = OP_HANDLES_WRONGSEC,
1306 .op_name = "OP_OPEN",
1307 },
1308 [OP_OPEN_CONFIRM] = {
1309 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1310 .op_name = "OP_OPEN_CONFIRM",
1311 },
1312 [OP_OPEN_DOWNGRADE] = {
1313 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1314 .op_name = "OP_OPEN_DOWNGRADE",
1315 },
1316 [OP_PUTFH] = {
1317 .op_func = (nfsd4op_func)nfsd4_putfh,
1318 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1319 | OP_IS_PUTFH_LIKE,
1320 .op_name = "OP_PUTFH",
1321 },
1322 [OP_PUTPUBFH] = {
1323 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1324 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1325 | OP_IS_PUTFH_LIKE,
1326 .op_name = "OP_PUTPUBFH",
1327 },
1328 [OP_PUTROOTFH] = {
1329 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1330 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1331 | OP_IS_PUTFH_LIKE,
1332 .op_name = "OP_PUTROOTFH",
1333 },
1334 [OP_READ] = {
1335 .op_func = (nfsd4op_func)nfsd4_read,
1336 .op_name = "OP_READ",
1337 },
1338 [OP_READDIR] = {
1339 .op_func = (nfsd4op_func)nfsd4_readdir,
1340 .op_name = "OP_READDIR",
1341 },
1342 [OP_READLINK] = {
1343 .op_func = (nfsd4op_func)nfsd4_readlink,
1344 .op_name = "OP_READLINK",
1345 },
1346 [OP_REMOVE] = {
1347 .op_func = (nfsd4op_func)nfsd4_remove,
1348 .op_name = "OP_REMOVE",
1349 .op_cacheresult = true,
1350 },
1351 [OP_RENAME] = {
1352 .op_name = "OP_RENAME",
1353 .op_func = (nfsd4op_func)nfsd4_rename,
1354 .op_cacheresult = true,
1355 },
1356 [OP_RENEW] = {
1357 .op_func = (nfsd4op_func)nfsd4_renew,
1358 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1359 .op_name = "OP_RENEW",
1360 },
1361 [OP_RESTOREFH] = {
1362 .op_func = (nfsd4op_func)nfsd4_restorefh,
1363 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1364 | OP_IS_PUTFH_LIKE,
1365 .op_name = "OP_RESTOREFH",
1366 },
1367 [OP_SAVEFH] = {
1368 .op_func = (nfsd4op_func)nfsd4_savefh,
1369 .op_flags = OP_HANDLES_WRONGSEC,
1370 .op_name = "OP_SAVEFH",
1371 },
1372 [OP_SECINFO] = {
1373 .op_func = (nfsd4op_func)nfsd4_secinfo,
1374 .op_flags = OP_HANDLES_WRONGSEC,
1375 .op_name = "OP_SECINFO",
1376 },
1377 [OP_SETATTR] = {
1378 .op_func = (nfsd4op_func)nfsd4_setattr,
1379 .op_name = "OP_SETATTR",
1380 .op_cacheresult = true,
1381 },
1382 [OP_SETCLIENTID] = {
1383 .op_func = (nfsd4op_func)nfsd4_setclientid,
1384 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1385 .op_name = "OP_SETCLIENTID",
1386 .op_cacheresult = true,
1387 },
1388 [OP_SETCLIENTID_CONFIRM] = {
1389 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1390 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1391 .op_name = "OP_SETCLIENTID_CONFIRM",
1392 .op_cacheresult = true,
1393 },
1394 [OP_VERIFY] = {
1395 .op_func = (nfsd4op_func)nfsd4_verify,
1396 .op_name = "OP_VERIFY",
1397 },
1398 [OP_WRITE] = {
1399 .op_func = (nfsd4op_func)nfsd4_write,
1400 .op_name = "OP_WRITE",
1401 .op_cacheresult = true,
1402 },
1403 [OP_RELEASE_LOCKOWNER] = {
1404 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1405 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1406 .op_name = "OP_RELEASE_LOCKOWNER",
1407 },
1408
1409 /* NFSv4.1 operations */
1410 [OP_EXCHANGE_ID] = {
1411 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1412 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1413 .op_name = "OP_EXCHANGE_ID",
1414 },
1415 [OP_BIND_CONN_TO_SESSION] = {
1416 .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
1417 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1418 .op_name = "OP_BIND_CONN_TO_SESSION",
1419 },
1420 [OP_CREATE_SESSION] = {
1421 .op_func = (nfsd4op_func)nfsd4_create_session,
1422 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1423 .op_name = "OP_CREATE_SESSION",
1424 },
1425 [OP_DESTROY_SESSION] = {
1426 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1427 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1428 .op_name = "OP_DESTROY_SESSION",
1429 },
1430 [OP_SEQUENCE] = {
1431 .op_func = (nfsd4op_func)nfsd4_sequence,
1432 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1433 .op_name = "OP_SEQUENCE",
1434 },
1435 [OP_DESTROY_CLIENTID] = {
1436 .op_func = NULL,
1437 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1438 .op_name = "OP_DESTROY_CLIENTID",
1439 },
1440 [OP_RECLAIM_COMPLETE] = {
1441 .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
1442 .op_flags = ALLOWED_WITHOUT_FH,
1443 .op_name = "OP_RECLAIM_COMPLETE",
1444 },
1445 [OP_SECINFO_NO_NAME] = {
1446 .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
1447 .op_flags = OP_HANDLES_WRONGSEC,
1448 .op_name = "OP_SECINFO_NO_NAME",
1449 },
1450 [OP_TEST_STATEID] = {
1451 .op_func = (nfsd4op_func)nfsd4_test_stateid,
1452 .op_flags = ALLOWED_WITHOUT_FH,
1453 .op_name = "OP_TEST_STATEID",
1454 },
1455 [OP_FREE_STATEID] = {
1456 .op_func = (nfsd4op_func)nfsd4_free_stateid,
1457 .op_flags = ALLOWED_WITHOUT_FH,
1458 .op_name = "OP_FREE_STATEID",
1459 },
1460};
1461
1462static const char *nfsd4_op_name(unsigned opnum)
1463{
1464 if (opnum < ARRAY_SIZE(nfsd4_ops))
1465 return nfsd4_ops[opnum].op_name;
1466 return "unknown_operation";
1467}
1468
1469#define nfsd4_voidres nfsd4_voidargs
1470struct nfsd4_voidargs { int dummy; };
1471
1472static struct svc_procedure nfsd_procedures4[2] = {
1473 [NFSPROC4_NULL] = {
1474 .pc_func = (svc_procfunc) nfsd4_proc_null,
1475 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1476 .pc_argsize = sizeof(struct nfsd4_voidargs),
1477 .pc_ressize = sizeof(struct nfsd4_voidres),
1478 .pc_cachetype = RC_NOCACHE,
1479 .pc_xdrressize = 1,
1480 },
1481 [NFSPROC4_COMPOUND] = {
1482 .pc_func = (svc_procfunc) nfsd4_proc_compound,
1483 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1484 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1485 .pc_argsize = sizeof(struct nfsd4_compoundargs),
1486 .pc_ressize = sizeof(struct nfsd4_compoundres),
1487 .pc_release = nfsd4_release_compoundargs,
1488 .pc_cachetype = RC_NOCACHE,
1489 .pc_xdrressize = NFSD_BUFSIZE/4,
1490 },
1491};
1492
1493struct svc_version nfsd_version4 = {
1494 .vs_vers = 4,
1495 .vs_nproc = 2,
1496 .vs_proc = nfsd_procedures4,
1497 .vs_dispatch = nfsd_dispatch,
1498 .vs_xdrsize = NFS4_SVC_XDRSIZE,
1499};
1500
1501/*
1502 * Local variables:
1503 * c-basic-offset: 8
1504 * End:
1505 */
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
55static bool inter_copy_offload_enable;
56module_param(inter_copy_offload_enable, bool, 0644);
57MODULE_PARM_DESC(inter_copy_offload_enable,
58 "Enable inter server to server copy offload. Default: false");
59
60static void cleanup_async_copy(struct nfsd4_copy *copy);
61
62#ifdef CONFIG_NFSD_V4_2_INTER_SSC
63static int nfsd4_ssc_umount_timeout = 900000; /* default to 15 mins */
64module_param(nfsd4_ssc_umount_timeout, int, 0644);
65MODULE_PARM_DESC(nfsd4_ssc_umount_timeout,
66 "idle msecs before unmount export from source server");
67#endif
68
69#define NFSDDBG_FACILITY NFSDDBG_PROC
70
71static u32 nfsd_attrmask[] = {
72 NFSD_WRITEABLE_ATTRS_WORD0,
73 NFSD_WRITEABLE_ATTRS_WORD1,
74 NFSD_WRITEABLE_ATTRS_WORD2
75};
76
77static u32 nfsd41_ex_attrmask[] = {
78 NFSD_SUPPATTR_EXCLCREAT_WORD0,
79 NFSD_SUPPATTR_EXCLCREAT_WORD1,
80 NFSD_SUPPATTR_EXCLCREAT_WORD2
81};
82
83static __be32
84check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
85 u32 *bmval, u32 *writable)
86{
87 struct dentry *dentry = cstate->current_fh.fh_dentry;
88 struct svc_export *exp = cstate->current_fh.fh_export;
89
90 if (!nfsd_attrs_supported(cstate->minorversion, bmval))
91 return nfserr_attrnotsupp;
92 if ((bmval[0] & FATTR4_WORD0_ACL) && !IS_POSIXACL(d_inode(dentry)))
93 return nfserr_attrnotsupp;
94 if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) &&
95 !(exp->ex_flags & NFSEXP_SECURITY_LABEL))
96 return nfserr_attrnotsupp;
97 if (writable && !bmval_is_subset(bmval, writable))
98 return nfserr_inval;
99 if (writable && (bmval[2] & FATTR4_WORD2_MODE_UMASK) &&
100 (bmval[1] & FATTR4_WORD1_MODE))
101 return nfserr_inval;
102 return nfs_ok;
103}
104
105static __be32
106nfsd4_check_open_attributes(struct svc_rqst *rqstp,
107 struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
108{
109 __be32 status = nfs_ok;
110
111 if (open->op_create == NFS4_OPEN_CREATE) {
112 if (open->op_createmode == NFS4_CREATE_UNCHECKED
113 || open->op_createmode == NFS4_CREATE_GUARDED)
114 status = check_attr_support(rqstp, cstate,
115 open->op_bmval, nfsd_attrmask);
116 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
117 status = check_attr_support(rqstp, cstate,
118 open->op_bmval, nfsd41_ex_attrmask);
119 }
120
121 return status;
122}
123
124static int
125is_create_with_attrs(struct nfsd4_open *open)
126{
127 return open->op_create == NFS4_OPEN_CREATE
128 && (open->op_createmode == NFS4_CREATE_UNCHECKED
129 || open->op_createmode == NFS4_CREATE_GUARDED
130 || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
131}
132
133static inline void
134fh_dup2(struct svc_fh *dst, struct svc_fh *src)
135{
136 fh_put(dst);
137 dget(src->fh_dentry);
138 if (src->fh_export)
139 exp_get(src->fh_export);
140 *dst = *src;
141}
142
143static __be32
144do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
145{
146
147 if (open->op_truncate &&
148 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
149 return nfserr_inval;
150
151 accmode |= NFSD_MAY_READ_IF_EXEC;
152
153 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
154 accmode |= NFSD_MAY_READ;
155 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
156 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
157 if (open->op_share_deny & NFS4_SHARE_DENY_READ)
158 accmode |= NFSD_MAY_WRITE;
159
160 return fh_verify(rqstp, current_fh, S_IFREG, accmode);
161}
162
163static __be32 nfsd_check_obj_isreg(struct svc_fh *fh, u32 minor_version)
164{
165 umode_t mode = d_inode(fh->fh_dentry)->i_mode;
166
167 if (S_ISREG(mode))
168 return nfs_ok;
169 if (S_ISDIR(mode))
170 return nfserr_isdir;
171 if (S_ISLNK(mode))
172 return nfserr_symlink;
173
174 /* RFC 7530 - 16.16.6 */
175 if (minor_version == 0)
176 return nfserr_symlink;
177 else
178 return nfserr_wrong_type;
179
180}
181
182static void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh *resfh)
183{
184 if (nfsd4_has_session(cstate))
185 return;
186 fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
187 &resfh->fh_handle);
188}
189
190static inline bool nfsd4_create_is_exclusive(int createmode)
191{
192 return createmode == NFS4_CREATE_EXCLUSIVE ||
193 createmode == NFS4_CREATE_EXCLUSIVE4_1;
194}
195
196static __be32
197nfsd4_vfs_create(struct svc_fh *fhp, struct dentry *child,
198 struct nfsd4_open *open)
199{
200 struct file *filp;
201 struct path path;
202 int oflags;
203
204 oflags = O_CREAT | O_LARGEFILE;
205 switch (open->op_share_access & NFS4_SHARE_ACCESS_BOTH) {
206 case NFS4_SHARE_ACCESS_WRITE:
207 oflags |= O_WRONLY;
208 break;
209 case NFS4_SHARE_ACCESS_BOTH:
210 oflags |= O_RDWR;
211 break;
212 default:
213 oflags |= O_RDONLY;
214 }
215
216 path.mnt = fhp->fh_export->ex_path.mnt;
217 path.dentry = child;
218 filp = dentry_create(&path, oflags, open->op_iattr.ia_mode,
219 current_cred());
220 if (IS_ERR(filp))
221 return nfserrno(PTR_ERR(filp));
222
223 open->op_filp = filp;
224 return nfs_ok;
225}
226
227/*
228 * Implement NFSv4's unchecked, guarded, and exclusive create
229 * semantics for regular files. Open state for this new file is
230 * subsequently fabricated in nfsd4_process_open2().
231 *
232 * Upon return, caller must release @fhp and @resfhp.
233 */
234static __be32
235nfsd4_create_file(struct svc_rqst *rqstp, struct svc_fh *fhp,
236 struct svc_fh *resfhp, struct nfsd4_open *open)
237{
238 struct iattr *iap = &open->op_iattr;
239 struct nfsd_attrs attrs = {
240 .na_iattr = iap,
241 .na_seclabel = &open->op_label,
242 };
243 struct dentry *parent, *child;
244 __u32 v_mtime, v_atime;
245 struct inode *inode;
246 __be32 status;
247 int host_err;
248
249 if (isdotent(open->op_fname, open->op_fnamelen))
250 return nfserr_exist;
251 if (!(iap->ia_valid & ATTR_MODE))
252 iap->ia_mode = 0;
253
254 status = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC);
255 if (status != nfs_ok)
256 return status;
257 parent = fhp->fh_dentry;
258 inode = d_inode(parent);
259
260 host_err = fh_want_write(fhp);
261 if (host_err)
262 return nfserrno(host_err);
263
264 if (is_create_with_attrs(open))
265 nfsd4_acl_to_attr(NF4REG, open->op_acl, &attrs);
266
267 inode_lock_nested(inode, I_MUTEX_PARENT);
268
269 child = lookup_one_len(open->op_fname, parent, open->op_fnamelen);
270 if (IS_ERR(child)) {
271 status = nfserrno(PTR_ERR(child));
272 goto out;
273 }
274
275 if (d_really_is_negative(child)) {
276 status = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE);
277 if (status != nfs_ok)
278 goto out;
279 }
280
281 status = fh_compose(resfhp, fhp->fh_export, child, fhp);
282 if (status != nfs_ok)
283 goto out;
284
285 v_mtime = 0;
286 v_atime = 0;
287 if (nfsd4_create_is_exclusive(open->op_createmode)) {
288 u32 *verifier = (u32 *)open->op_verf.data;
289
290 /*
291 * Solaris 7 gets confused (bugid 4218508) if these have
292 * the high bit set, as do xfs filesystems without the
293 * "bigtime" feature. So just clear the high bits. If this
294 * is ever changed to use different attrs for storing the
295 * verifier, then do_open_lookup() will also need to be
296 * fixed accordingly.
297 */
298 v_mtime = verifier[0] & 0x7fffffff;
299 v_atime = verifier[1] & 0x7fffffff;
300 }
301
302 if (d_really_is_positive(child)) {
303 /* NFSv4 protocol requires change attributes even though
304 * no change happened.
305 */
306 status = fh_fill_both_attrs(fhp);
307 if (status != nfs_ok)
308 goto out;
309
310 switch (open->op_createmode) {
311 case NFS4_CREATE_UNCHECKED:
312 if (!d_is_reg(child))
313 break;
314
315 /*
316 * In NFSv4, we don't want to truncate the file
317 * now. This would be wrong if the OPEN fails for
318 * some other reason. Furthermore, if the size is
319 * nonzero, we should ignore it according to spec!
320 */
321 open->op_truncate = (iap->ia_valid & ATTR_SIZE) &&
322 !iap->ia_size;
323 break;
324 case NFS4_CREATE_GUARDED:
325 status = nfserr_exist;
326 break;
327 case NFS4_CREATE_EXCLUSIVE:
328 if (inode_get_mtime_sec(d_inode(child)) == v_mtime &&
329 inode_get_atime_sec(d_inode(child)) == v_atime &&
330 d_inode(child)->i_size == 0) {
331 open->op_created = true;
332 break; /* subtle */
333 }
334 status = nfserr_exist;
335 break;
336 case NFS4_CREATE_EXCLUSIVE4_1:
337 if (inode_get_mtime_sec(d_inode(child)) == v_mtime &&
338 inode_get_atime_sec(d_inode(child)) == v_atime &&
339 d_inode(child)->i_size == 0) {
340 open->op_created = true;
341 goto set_attr; /* subtle */
342 }
343 status = nfserr_exist;
344 }
345 goto out;
346 }
347
348 if (!IS_POSIXACL(inode))
349 iap->ia_mode &= ~current_umask();
350
351 status = fh_fill_pre_attrs(fhp);
352 if (status != nfs_ok)
353 goto out;
354 status = nfsd4_vfs_create(fhp, child, open);
355 if (status != nfs_ok)
356 goto out;
357 open->op_created = true;
358 fh_fill_post_attrs(fhp);
359
360 /* A newly created file already has a file size of zero. */
361 if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0))
362 iap->ia_valid &= ~ATTR_SIZE;
363 if (nfsd4_create_is_exclusive(open->op_createmode)) {
364 iap->ia_valid = ATTR_MTIME | ATTR_ATIME |
365 ATTR_MTIME_SET|ATTR_ATIME_SET;
366 iap->ia_mtime.tv_sec = v_mtime;
367 iap->ia_atime.tv_sec = v_atime;
368 iap->ia_mtime.tv_nsec = 0;
369 iap->ia_atime.tv_nsec = 0;
370 }
371
372set_attr:
373 status = nfsd_create_setattr(rqstp, fhp, resfhp, &attrs);
374
375 if (attrs.na_labelerr)
376 open->op_bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
377 if (attrs.na_aclerr)
378 open->op_bmval[0] &= ~FATTR4_WORD0_ACL;
379out:
380 inode_unlock(inode);
381 nfsd_attrs_free(&attrs);
382 if (child && !IS_ERR(child))
383 dput(child);
384 fh_drop_write(fhp);
385 return status;
386}
387
388/**
389 * set_change_info - set up the change_info4 for a reply
390 * @cinfo: pointer to nfsd4_change_info to be populated
391 * @fhp: pointer to svc_fh to use as source
392 *
393 * Many operations in NFSv4 require change_info4 in the reply. This function
394 * populates that from the info that we (should!) have already collected. In
395 * the event that we didn't get any pre-attrs, just zero out both.
396 */
397static void
398set_change_info(struct nfsd4_change_info *cinfo, struct svc_fh *fhp)
399{
400 cinfo->atomic = (u32)(fhp->fh_pre_saved && fhp->fh_post_saved && !fhp->fh_no_atomic_attr);
401 cinfo->before_change = fhp->fh_pre_change;
402 cinfo->after_change = fhp->fh_post_change;
403
404 /*
405 * If fetching the pre-change attributes failed, then we should
406 * have already failed the whole operation. We could have still
407 * failed to fetch post-change attributes however.
408 *
409 * If we didn't get post-op attrs, just zero-out the after
410 * field since we don't know what it should be. If the pre_saved
411 * field isn't set for some reason, throw warning and just copy
412 * whatever is in the after field.
413 */
414 if (WARN_ON_ONCE(!fhp->fh_pre_saved))
415 cinfo->before_change = 0;
416 if (!fhp->fh_post_saved)
417 cinfo->after_change = cinfo->before_change + 1;
418}
419
420static __be32
421do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh **resfh)
422{
423 struct svc_fh *current_fh = &cstate->current_fh;
424 int accmode;
425 __be32 status;
426
427 *resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
428 if (!*resfh)
429 return nfserr_jukebox;
430 fh_init(*resfh, NFS4_FHSIZE);
431 open->op_truncate = false;
432
433 if (open->op_create) {
434 /* FIXME: check session persistence and pnfs flags.
435 * The nfsv4.1 spec requires the following semantics:
436 *
437 * Persistent | pNFS | Server REQUIRED | Client Allowed
438 * Reply Cache | server | |
439 * -------------+--------+-----------------+--------------------
440 * no | no | EXCLUSIVE4_1 | EXCLUSIVE4_1
441 * | | | (SHOULD)
442 * | | and EXCLUSIVE4 | or EXCLUSIVE4
443 * | | | (SHOULD NOT)
444 * no | yes | EXCLUSIVE4_1 | EXCLUSIVE4_1
445 * yes | no | GUARDED4 | GUARDED4
446 * yes | yes | GUARDED4 | GUARDED4
447 */
448
449 current->fs->umask = open->op_umask;
450 status = nfsd4_create_file(rqstp, current_fh, *resfh, open);
451 current->fs->umask = 0;
452
453 /*
454 * Following rfc 3530 14.2.16, and rfc 5661 18.16.4
455 * use the returned bitmask to indicate which attributes
456 * we used to store the verifier:
457 */
458 if (nfsd4_create_is_exclusive(open->op_createmode) && status == 0)
459 open->op_bmval[1] |= (FATTR4_WORD1_TIME_ACCESS |
460 FATTR4_WORD1_TIME_MODIFY);
461 } else {
462 status = nfsd_lookup(rqstp, current_fh,
463 open->op_fname, open->op_fnamelen, *resfh);
464 if (status == nfs_ok)
465 /* NFSv4 protocol requires change attributes even though
466 * no change happened.
467 */
468 status = fh_fill_both_attrs(current_fh);
469 }
470 if (status)
471 goto out;
472 status = nfsd_check_obj_isreg(*resfh, cstate->minorversion);
473 if (status)
474 goto out;
475
476 nfsd4_set_open_owner_reply_cache(cstate, open, *resfh);
477 accmode = NFSD_MAY_NOP;
478 if (open->op_created ||
479 open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
480 accmode |= NFSD_MAY_OWNER_OVERRIDE;
481 status = do_open_permission(rqstp, *resfh, open, accmode);
482 set_change_info(&open->op_cinfo, current_fh);
483out:
484 return status;
485}
486
487static __be32
488do_open_fhandle(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
489{
490 struct svc_fh *current_fh = &cstate->current_fh;
491 int accmode = 0;
492
493 /* We don't know the target directory, and therefore can not
494 * set the change info
495 */
496
497 memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
498
499 nfsd4_set_open_owner_reply_cache(cstate, open, current_fh);
500
501 open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
502 (open->op_iattr.ia_size == 0);
503 /*
504 * In the delegation case, the client is telling us about an
505 * open that it *already* performed locally, some time ago. We
506 * should let it succeed now if possible.
507 *
508 * In the case of a CLAIM_FH open, on the other hand, the client
509 * may be counting on us to enforce permissions (the Linux 4.1
510 * client uses this for normal opens, for example).
511 */
512 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
513 accmode = NFSD_MAY_OWNER_OVERRIDE;
514
515 return do_open_permission(rqstp, current_fh, open, accmode);
516}
517
518static void
519copy_clientid(clientid_t *clid, struct nfsd4_session *session)
520{
521 struct nfsd4_sessionid *sid =
522 (struct nfsd4_sessionid *)session->se_sessionid.data;
523
524 clid->cl_boot = sid->clientid.cl_boot;
525 clid->cl_id = sid->clientid.cl_id;
526}
527
528static __be32
529nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
530 union nfsd4_op_u *u)
531{
532 struct nfsd4_open *open = &u->open;
533 __be32 status;
534 struct svc_fh *resfh = NULL;
535 struct net *net = SVC_NET(rqstp);
536 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
537 bool reclaim = false;
538
539 dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
540 (int)open->op_fnamelen, open->op_fname,
541 open->op_openowner);
542
543 open->op_filp = NULL;
544 open->op_rqstp = rqstp;
545
546 /* This check required by spec. */
547 if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
548 return nfserr_inval;
549
550 open->op_created = false;
551 /*
552 * RFC5661 18.51.3
553 * Before RECLAIM_COMPLETE done, server should deny new lock
554 */
555 if (nfsd4_has_session(cstate) &&
556 !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &cstate->clp->cl_flags) &&
557 open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
558 return nfserr_grace;
559
560 if (nfsd4_has_session(cstate))
561 copy_clientid(&open->op_clientid, cstate->session);
562
563 /* check seqid for replay. set nfs4_owner */
564 status = nfsd4_process_open1(cstate, open, nn);
565 if (status == nfserr_replay_me) {
566 struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
567 fh_put(&cstate->current_fh);
568 fh_copy_shallow(&cstate->current_fh.fh_handle,
569 &rp->rp_openfh);
570 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
571 if (status)
572 dprintk("nfsd4_open: replay failed"
573 " restoring previous filehandle\n");
574 else
575 status = nfserr_replay_me;
576 }
577 if (status)
578 goto out;
579 if (open->op_xdr_error) {
580 status = open->op_xdr_error;
581 goto out;
582 }
583
584 status = nfsd4_check_open_attributes(rqstp, cstate, open);
585 if (status)
586 goto out;
587
588 /* Openowner is now set, so sequence id will get bumped. Now we need
589 * these checks before we do any creates: */
590 status = nfserr_grace;
591 if (opens_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
592 goto out;
593 status = nfserr_no_grace;
594 if (!opens_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
595 goto out;
596
597 switch (open->op_claim_type) {
598 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
599 case NFS4_OPEN_CLAIM_NULL:
600 status = do_open_lookup(rqstp, cstate, open, &resfh);
601 if (status)
602 goto out;
603 break;
604 case NFS4_OPEN_CLAIM_PREVIOUS:
605 status = nfs4_check_open_reclaim(cstate->clp);
606 if (status)
607 goto out;
608 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
609 reclaim = true;
610 fallthrough;
611 case NFS4_OPEN_CLAIM_FH:
612 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
613 status = do_open_fhandle(rqstp, cstate, open);
614 if (status)
615 goto out;
616 resfh = &cstate->current_fh;
617 break;
618 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
619 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
620 status = nfserr_notsupp;
621 goto out;
622 default:
623 status = nfserr_inval;
624 goto out;
625 }
626
627 status = nfsd4_process_open2(rqstp, resfh, open);
628 if (status && open->op_created)
629 pr_warn("nfsd4_process_open2 failed to open newly-created file: status=%u\n",
630 be32_to_cpu(status));
631 if (reclaim && !status)
632 nn->somebody_reclaimed = true;
633out:
634 if (open->op_filp) {
635 fput(open->op_filp);
636 open->op_filp = NULL;
637 }
638 if (resfh && resfh != &cstate->current_fh) {
639 fh_dup2(&cstate->current_fh, resfh);
640 fh_put(resfh);
641 kfree(resfh);
642 }
643 nfsd4_cleanup_open_state(cstate, open);
644 nfsd4_bump_seqid(cstate, status);
645 return status;
646}
647
648/*
649 * OPEN is the only seqid-mutating operation whose decoding can fail
650 * with a seqid-mutating error (specifically, decoding of user names in
651 * the attributes). Therefore we have to do some processing to look up
652 * the stateowner so that we can bump the seqid.
653 */
654static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
655{
656 struct nfsd4_open *open = &op->u.open;
657
658 if (!seqid_mutating_err(ntohl(op->status)))
659 return op->status;
660 if (nfsd4_has_session(cstate))
661 return op->status;
662 open->op_xdr_error = op->status;
663 return nfsd4_open(rqstp, cstate, &op->u);
664}
665
666/*
667 * filehandle-manipulating ops.
668 */
669static __be32
670nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
671 union nfsd4_op_u *u)
672{
673 u->getfh = &cstate->current_fh;
674 return nfs_ok;
675}
676
677static __be32
678nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
679 union nfsd4_op_u *u)
680{
681 struct nfsd4_putfh *putfh = &u->putfh;
682 __be32 ret;
683
684 fh_put(&cstate->current_fh);
685 cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
686 memcpy(&cstate->current_fh.fh_handle.fh_raw, putfh->pf_fhval,
687 putfh->pf_fhlen);
688 ret = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
689#ifdef CONFIG_NFSD_V4_2_INTER_SSC
690 if (ret == nfserr_stale && putfh->no_verify) {
691 SET_FH_FLAG(&cstate->current_fh, NFSD4_FH_FOREIGN);
692 ret = 0;
693 }
694#endif
695 return ret;
696}
697
698static __be32
699nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
700 union nfsd4_op_u *u)
701{
702 fh_put(&cstate->current_fh);
703
704 return exp_pseudoroot(rqstp, &cstate->current_fh);
705}
706
707static __be32
708nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
709 union nfsd4_op_u *u)
710{
711 if (!cstate->save_fh.fh_dentry)
712 return nfserr_restorefh;
713
714 fh_dup2(&cstate->current_fh, &cstate->save_fh);
715 if (HAS_CSTATE_FLAG(cstate, SAVED_STATE_ID_FLAG)) {
716 memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
717 SET_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG);
718 }
719 return nfs_ok;
720}
721
722static __be32
723nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
724 union nfsd4_op_u *u)
725{
726 fh_dup2(&cstate->save_fh, &cstate->current_fh);
727 if (HAS_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG)) {
728 memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
729 SET_CSTATE_FLAG(cstate, SAVED_STATE_ID_FLAG);
730 }
731 return nfs_ok;
732}
733
734/*
735 * misc nfsv4 ops
736 */
737static __be32
738nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
739 union nfsd4_op_u *u)
740{
741 struct nfsd4_access *access = &u->access;
742 u32 access_full;
743
744 access_full = NFS3_ACCESS_FULL;
745 if (cstate->minorversion >= 2)
746 access_full |= NFS4_ACCESS_XALIST | NFS4_ACCESS_XAREAD |
747 NFS4_ACCESS_XAWRITE;
748
749 if (access->ac_req_access & ~access_full)
750 return nfserr_inval;
751
752 access->ac_resp_access = access->ac_req_access;
753 return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
754 &access->ac_supported);
755}
756
757static __be32
758nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
759 union nfsd4_op_u *u)
760{
761 struct nfsd4_commit *commit = &u->commit;
762 struct nfsd_file *nf;
763 __be32 status;
764
765 status = nfsd_file_acquire(rqstp, &cstate->current_fh, NFSD_MAY_WRITE |
766 NFSD_MAY_NOT_BREAK_LEASE, &nf);
767 if (status != nfs_ok)
768 return status;
769
770 status = nfsd_commit(rqstp, &cstate->current_fh, nf, commit->co_offset,
771 commit->co_count,
772 (__be32 *)commit->co_verf.data);
773 nfsd_file_put(nf);
774 return status;
775}
776
777static __be32
778nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
779 union nfsd4_op_u *u)
780{
781 struct nfsd4_create *create = &u->create;
782 struct nfsd_attrs attrs = {
783 .na_iattr = &create->cr_iattr,
784 .na_seclabel = &create->cr_label,
785 };
786 struct svc_fh resfh;
787 __be32 status;
788 dev_t rdev;
789
790 fh_init(&resfh, NFS4_FHSIZE);
791
792 status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_NOP);
793 if (status)
794 return status;
795
796 status = check_attr_support(rqstp, cstate, create->cr_bmval,
797 nfsd_attrmask);
798 if (status)
799 return status;
800
801 status = nfsd4_acl_to_attr(create->cr_type, create->cr_acl, &attrs);
802 current->fs->umask = create->cr_umask;
803 switch (create->cr_type) {
804 case NF4LNK:
805 status = nfsd_symlink(rqstp, &cstate->current_fh,
806 create->cr_name, create->cr_namelen,
807 create->cr_data, &attrs, &resfh);
808 break;
809
810 case NF4BLK:
811 status = nfserr_inval;
812 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
813 if (MAJOR(rdev) != create->cr_specdata1 ||
814 MINOR(rdev) != create->cr_specdata2)
815 goto out_umask;
816 status = nfsd_create(rqstp, &cstate->current_fh,
817 create->cr_name, create->cr_namelen,
818 &attrs, S_IFBLK, rdev, &resfh);
819 break;
820
821 case NF4CHR:
822 status = nfserr_inval;
823 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
824 if (MAJOR(rdev) != create->cr_specdata1 ||
825 MINOR(rdev) != create->cr_specdata2)
826 goto out_umask;
827 status = nfsd_create(rqstp, &cstate->current_fh,
828 create->cr_name, create->cr_namelen,
829 &attrs, S_IFCHR, rdev, &resfh);
830 break;
831
832 case NF4SOCK:
833 status = nfsd_create(rqstp, &cstate->current_fh,
834 create->cr_name, create->cr_namelen,
835 &attrs, S_IFSOCK, 0, &resfh);
836 break;
837
838 case NF4FIFO:
839 status = nfsd_create(rqstp, &cstate->current_fh,
840 create->cr_name, create->cr_namelen,
841 &attrs, S_IFIFO, 0, &resfh);
842 break;
843
844 case NF4DIR:
845 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
846 status = nfsd_create(rqstp, &cstate->current_fh,
847 create->cr_name, create->cr_namelen,
848 &attrs, S_IFDIR, 0, &resfh);
849 break;
850
851 default:
852 status = nfserr_badtype;
853 }
854
855 if (status)
856 goto out;
857
858 if (attrs.na_labelerr)
859 create->cr_bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
860 if (attrs.na_aclerr)
861 create->cr_bmval[0] &= ~FATTR4_WORD0_ACL;
862 set_change_info(&create->cr_cinfo, &cstate->current_fh);
863 fh_dup2(&cstate->current_fh, &resfh);
864out:
865 fh_put(&resfh);
866out_umask:
867 current->fs->umask = 0;
868 nfsd_attrs_free(&attrs);
869 return status;
870}
871
872static __be32
873nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
874 union nfsd4_op_u *u)
875{
876 struct nfsd4_getattr *getattr = &u->getattr;
877 __be32 status;
878
879 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
880 if (status)
881 return status;
882
883 if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
884 return nfserr_inval;
885
886 getattr->ga_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
887 getattr->ga_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
888 getattr->ga_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
889
890 getattr->ga_fhp = &cstate->current_fh;
891 return nfs_ok;
892}
893
894static __be32
895nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
896 union nfsd4_op_u *u)
897{
898 struct nfsd4_link *link = &u->link;
899 __be32 status;
900
901 status = nfsd_link(rqstp, &cstate->current_fh,
902 link->li_name, link->li_namelen, &cstate->save_fh);
903 if (!status)
904 set_change_info(&link->li_cinfo, &cstate->current_fh);
905 return status;
906}
907
908static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
909{
910 struct svc_fh tmp_fh;
911 __be32 ret;
912
913 fh_init(&tmp_fh, NFS4_FHSIZE);
914 ret = exp_pseudoroot(rqstp, &tmp_fh);
915 if (ret)
916 return ret;
917 if (tmp_fh.fh_dentry == fh->fh_dentry) {
918 fh_put(&tmp_fh);
919 return nfserr_noent;
920 }
921 fh_put(&tmp_fh);
922 return nfsd_lookup(rqstp, fh, "..", 2, fh);
923}
924
925static __be32
926nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
927 union nfsd4_op_u *u)
928{
929 return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
930}
931
932static __be32
933nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
934 union nfsd4_op_u *u)
935{
936 return nfsd_lookup(rqstp, &cstate->current_fh,
937 u->lookup.lo_name, u->lookup.lo_len,
938 &cstate->current_fh);
939}
940
941static __be32
942nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
943 union nfsd4_op_u *u)
944{
945 struct nfsd4_read *read = &u->read;
946 __be32 status;
947
948 read->rd_nf = NULL;
949
950 trace_nfsd_read_start(rqstp, &cstate->current_fh,
951 read->rd_offset, read->rd_length);
952
953 read->rd_length = min_t(u32, read->rd_length, svc_max_payload(rqstp));
954 if (read->rd_offset > (u64)OFFSET_MAX)
955 read->rd_offset = (u64)OFFSET_MAX;
956 if (read->rd_offset + read->rd_length > (u64)OFFSET_MAX)
957 read->rd_length = (u64)OFFSET_MAX - read->rd_offset;
958
959 /*
960 * If we do a zero copy read, then a client will see read data
961 * that reflects the state of the file *after* performing the
962 * following compound.
963 *
964 * To ensure proper ordering, we therefore turn off zero copy if
965 * the client wants us to do more in this compound:
966 */
967 if (!nfsd4_last_compound_op(rqstp)) {
968 struct nfsd4_compoundargs *argp = rqstp->rq_argp;
969
970 argp->splice_ok = false;
971 }
972
973 /* check stateid */
974 status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
975 &read->rd_stateid, RD_STATE,
976 &read->rd_nf, NULL);
977
978 read->rd_rqstp = rqstp;
979 read->rd_fhp = &cstate->current_fh;
980 return status;
981}
982
983
984static void
985nfsd4_read_release(union nfsd4_op_u *u)
986{
987 if (u->read.rd_nf)
988 nfsd_file_put(u->read.rd_nf);
989 trace_nfsd_read_done(u->read.rd_rqstp, u->read.rd_fhp,
990 u->read.rd_offset, u->read.rd_length);
991}
992
993static __be32
994nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
995 union nfsd4_op_u *u)
996{
997 struct nfsd4_readdir *readdir = &u->readdir;
998 u64 cookie = readdir->rd_cookie;
999 static const nfs4_verifier zeroverf;
1000
1001 /* no need to check permission - this will be done in nfsd_readdir() */
1002
1003 if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
1004 return nfserr_inval;
1005
1006 readdir->rd_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
1007 readdir->rd_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
1008 readdir->rd_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
1009
1010 if ((cookie == 1) || (cookie == 2) ||
1011 (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
1012 return nfserr_bad_cookie;
1013
1014 readdir->rd_rqstp = rqstp;
1015 readdir->rd_fhp = &cstate->current_fh;
1016 return nfs_ok;
1017}
1018
1019static __be32
1020nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1021 union nfsd4_op_u *u)
1022{
1023 u->readlink.rl_rqstp = rqstp;
1024 u->readlink.rl_fhp = &cstate->current_fh;
1025 return nfs_ok;
1026}
1027
1028static __be32
1029nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1030 union nfsd4_op_u *u)
1031{
1032 struct nfsd4_remove *remove = &u->remove;
1033 __be32 status;
1034
1035 if (opens_in_grace(SVC_NET(rqstp)))
1036 return nfserr_grace;
1037 status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
1038 remove->rm_name, remove->rm_namelen);
1039 if (!status)
1040 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
1041 return status;
1042}
1043
1044static __be32
1045nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1046 union nfsd4_op_u *u)
1047{
1048 struct nfsd4_rename *rename = &u->rename;
1049 __be32 status;
1050
1051 if (opens_in_grace(SVC_NET(rqstp)))
1052 return nfserr_grace;
1053 status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
1054 rename->rn_snamelen, &cstate->current_fh,
1055 rename->rn_tname, rename->rn_tnamelen);
1056 if (status)
1057 return status;
1058 set_change_info(&rename->rn_sinfo, &cstate->save_fh);
1059 set_change_info(&rename->rn_tinfo, &cstate->current_fh);
1060 return nfs_ok;
1061}
1062
1063static __be32
1064nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1065 union nfsd4_op_u *u)
1066{
1067 struct nfsd4_secinfo *secinfo = &u->secinfo;
1068 struct svc_export *exp;
1069 struct dentry *dentry;
1070 __be32 err;
1071
1072 err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
1073 if (err)
1074 return err;
1075 err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
1076 secinfo->si_name, secinfo->si_namelen,
1077 &exp, &dentry);
1078 if (err)
1079 return err;
1080 if (d_really_is_negative(dentry)) {
1081 exp_put(exp);
1082 err = nfserr_noent;
1083 } else
1084 secinfo->si_exp = exp;
1085 dput(dentry);
1086 if (cstate->minorversion)
1087 /* See rfc 5661 section 2.6.3.1.1.8 */
1088 fh_put(&cstate->current_fh);
1089 return err;
1090}
1091
1092static __be32
1093nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1094 union nfsd4_op_u *u)
1095{
1096 __be32 err;
1097
1098 switch (u->secinfo_no_name.sin_style) {
1099 case NFS4_SECINFO_STYLE4_CURRENT_FH:
1100 break;
1101 case NFS4_SECINFO_STYLE4_PARENT:
1102 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
1103 if (err)
1104 return err;
1105 break;
1106 default:
1107 return nfserr_inval;
1108 }
1109
1110 u->secinfo_no_name.sin_exp = exp_get(cstate->current_fh.fh_export);
1111 fh_put(&cstate->current_fh);
1112 return nfs_ok;
1113}
1114
1115static void
1116nfsd4_secinfo_release(union nfsd4_op_u *u)
1117{
1118 if (u->secinfo.si_exp)
1119 exp_put(u->secinfo.si_exp);
1120}
1121
1122static void
1123nfsd4_secinfo_no_name_release(union nfsd4_op_u *u)
1124{
1125 if (u->secinfo_no_name.sin_exp)
1126 exp_put(u->secinfo_no_name.sin_exp);
1127}
1128
1129static __be32
1130nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1131 union nfsd4_op_u *u)
1132{
1133 struct nfsd4_setattr *setattr = &u->setattr;
1134 struct nfsd_attrs attrs = {
1135 .na_iattr = &setattr->sa_iattr,
1136 .na_seclabel = &setattr->sa_label,
1137 };
1138 struct inode *inode;
1139 __be32 status = nfs_ok;
1140 bool save_no_wcc;
1141 int err;
1142
1143 if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
1144 status = nfs4_preprocess_stateid_op(rqstp, cstate,
1145 &cstate->current_fh, &setattr->sa_stateid,
1146 WR_STATE, NULL, NULL);
1147 if (status)
1148 return status;
1149 }
1150 err = fh_want_write(&cstate->current_fh);
1151 if (err)
1152 return nfserrno(err);
1153 status = nfs_ok;
1154
1155 status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
1156 nfsd_attrmask);
1157 if (status)
1158 goto out;
1159
1160 inode = cstate->current_fh.fh_dentry->d_inode;
1161 status = nfsd4_acl_to_attr(S_ISDIR(inode->i_mode) ? NF4DIR : NF4REG,
1162 setattr->sa_acl, &attrs);
1163
1164 if (status)
1165 goto out;
1166 save_no_wcc = cstate->current_fh.fh_no_wcc;
1167 cstate->current_fh.fh_no_wcc = true;
1168 status = nfsd_setattr(rqstp, &cstate->current_fh, &attrs, NULL);
1169 cstate->current_fh.fh_no_wcc = save_no_wcc;
1170 if (!status)
1171 status = nfserrno(attrs.na_labelerr);
1172 if (!status)
1173 status = nfserrno(attrs.na_aclerr);
1174out:
1175 nfsd_attrs_free(&attrs);
1176 fh_drop_write(&cstate->current_fh);
1177 return status;
1178}
1179
1180static __be32
1181nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1182 union nfsd4_op_u *u)
1183{
1184 struct nfsd4_write *write = &u->write;
1185 stateid_t *stateid = &write->wr_stateid;
1186 struct nfsd_file *nf = NULL;
1187 __be32 status = nfs_ok;
1188 unsigned long cnt;
1189 int nvecs;
1190
1191 if (write->wr_offset > (u64)OFFSET_MAX ||
1192 write->wr_offset + write->wr_buflen > (u64)OFFSET_MAX)
1193 return nfserr_fbig;
1194
1195 cnt = write->wr_buflen;
1196 trace_nfsd_write_start(rqstp, &cstate->current_fh,
1197 write->wr_offset, cnt);
1198 status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1199 stateid, WR_STATE, &nf, NULL);
1200 if (status)
1201 return status;
1202
1203 write->wr_how_written = write->wr_stable_how;
1204
1205 nvecs = svc_fill_write_vector(rqstp, &write->wr_payload);
1206 WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1207
1208 status = nfsd_vfs_write(rqstp, &cstate->current_fh, nf,
1209 write->wr_offset, rqstp->rq_vec, nvecs, &cnt,
1210 write->wr_how_written,
1211 (__be32 *)write->wr_verifier.data);
1212 nfsd_file_put(nf);
1213
1214 write->wr_bytes_written = cnt;
1215 trace_nfsd_write_done(rqstp, &cstate->current_fh,
1216 write->wr_offset, cnt);
1217 return status;
1218}
1219
1220static __be32
1221nfsd4_verify_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1222 stateid_t *src_stateid, struct nfsd_file **src,
1223 stateid_t *dst_stateid, struct nfsd_file **dst)
1224{
1225 __be32 status;
1226
1227 if (!cstate->save_fh.fh_dentry)
1228 return nfserr_nofilehandle;
1229
1230 status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->save_fh,
1231 src_stateid, RD_STATE, src, NULL);
1232 if (status)
1233 goto out;
1234
1235 status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1236 dst_stateid, WR_STATE, dst, NULL);
1237 if (status)
1238 goto out_put_src;
1239
1240 /* fix up for NFS-specific error code */
1241 if (!S_ISREG(file_inode((*src)->nf_file)->i_mode) ||
1242 !S_ISREG(file_inode((*dst)->nf_file)->i_mode)) {
1243 status = nfserr_wrong_type;
1244 goto out_put_dst;
1245 }
1246
1247out:
1248 return status;
1249out_put_dst:
1250 nfsd_file_put(*dst);
1251 *dst = NULL;
1252out_put_src:
1253 nfsd_file_put(*src);
1254 *src = NULL;
1255 goto out;
1256}
1257
1258static __be32
1259nfsd4_clone(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1260 union nfsd4_op_u *u)
1261{
1262 struct nfsd4_clone *clone = &u->clone;
1263 struct nfsd_file *src, *dst;
1264 __be32 status;
1265
1266 status = nfsd4_verify_copy(rqstp, cstate, &clone->cl_src_stateid, &src,
1267 &clone->cl_dst_stateid, &dst);
1268 if (status)
1269 goto out;
1270
1271 status = nfsd4_clone_file_range(rqstp, src, clone->cl_src_pos,
1272 dst, clone->cl_dst_pos, clone->cl_count,
1273 EX_ISSYNC(cstate->current_fh.fh_export));
1274
1275 nfsd_file_put(dst);
1276 nfsd_file_put(src);
1277out:
1278 return status;
1279}
1280
1281/**
1282 * nfsd4_has_active_async_copies - Check for ongoing copy operations
1283 * @clp: Client to be checked
1284 *
1285 * NFSD maintains state for async COPY operations after they complete,
1286 * and this state remains in the nfs4_client's async_copies list.
1287 * Ongoing copies should block the destruction of the nfs4_client, but
1288 * completed copies should not.
1289 *
1290 * Return values:
1291 * %true: At least one active async COPY is ongoing
1292 * %false: No active async COPY operations were found
1293 */
1294bool nfsd4_has_active_async_copies(struct nfs4_client *clp)
1295{
1296 struct nfsd4_copy *copy;
1297 bool result = false;
1298
1299 spin_lock(&clp->async_lock);
1300 list_for_each_entry(copy, &clp->async_copies, copies) {
1301 if (!test_bit(NFSD4_COPY_F_COMPLETED, ©->cp_flags) &&
1302 !test_bit(NFSD4_COPY_F_STOPPED, ©->cp_flags)) {
1303 result = true;
1304 break;
1305 }
1306 }
1307 spin_unlock(&clp->async_lock);
1308 return result;
1309}
1310
1311/**
1312 * nfsd4_async_copy_reaper - Purge completed copies
1313 * @nn: Network namespace with possible active copy information
1314 */
1315void nfsd4_async_copy_reaper(struct nfsd_net *nn)
1316{
1317 struct nfs4_client *clp;
1318 struct nfsd4_copy *copy;
1319 LIST_HEAD(reaplist);
1320
1321 spin_lock(&nn->client_lock);
1322 list_for_each_entry(clp, &nn->client_lru, cl_lru) {
1323 struct list_head *pos, *next;
1324
1325 spin_lock(&clp->async_lock);
1326 list_for_each_safe(pos, next, &clp->async_copies) {
1327 copy = list_entry(pos, struct nfsd4_copy, copies);
1328 if (test_bit(NFSD4_COPY_F_OFFLOAD_DONE, ©->cp_flags)) {
1329 if (--copy->cp_ttl) {
1330 list_del_init(©->copies);
1331 list_add(©->copies, &reaplist);
1332 }
1333 }
1334 }
1335 spin_unlock(&clp->async_lock);
1336 }
1337 spin_unlock(&nn->client_lock);
1338
1339 while (!list_empty(&reaplist)) {
1340 copy = list_first_entry(&reaplist, struct nfsd4_copy, copies);
1341 list_del_init(©->copies);
1342 cleanup_async_copy(copy);
1343 }
1344}
1345
1346static void nfs4_put_copy(struct nfsd4_copy *copy)
1347{
1348 if (!refcount_dec_and_test(©->refcount))
1349 return;
1350 kfree(copy->cp_src);
1351 kfree(copy);
1352}
1353
1354static void nfsd4_stop_copy(struct nfsd4_copy *copy)
1355{
1356 trace_nfsd_copy_async_cancel(copy);
1357 if (!test_and_set_bit(NFSD4_COPY_F_STOPPED, ©->cp_flags))
1358 kthread_stop(copy->copy_task);
1359 nfs4_put_copy(copy);
1360}
1361
1362static struct nfsd4_copy *nfsd4_unhash_copy(struct nfs4_client *clp)
1363{
1364 struct nfsd4_copy *copy = NULL;
1365
1366 spin_lock(&clp->async_lock);
1367 if (!list_empty(&clp->async_copies)) {
1368 copy = list_first_entry(&clp->async_copies, struct nfsd4_copy,
1369 copies);
1370 refcount_inc(©->refcount);
1371 copy->cp_clp = NULL;
1372 if (!list_empty(©->copies))
1373 list_del_init(©->copies);
1374 }
1375 spin_unlock(&clp->async_lock);
1376 return copy;
1377}
1378
1379void nfsd4_shutdown_copy(struct nfs4_client *clp)
1380{
1381 struct nfsd4_copy *copy;
1382
1383 while ((copy = nfsd4_unhash_copy(clp)) != NULL)
1384 nfsd4_stop_copy(copy);
1385}
1386#ifdef CONFIG_NFSD_V4_2_INTER_SSC
1387
1388extern struct file *nfs42_ssc_open(struct vfsmount *ss_mnt,
1389 struct nfs_fh *src_fh,
1390 nfs4_stateid *stateid);
1391extern void nfs42_ssc_close(struct file *filep);
1392
1393extern void nfs_sb_deactive(struct super_block *sb);
1394
1395#define NFSD42_INTERSSC_MOUNTOPS "vers=4.2,addr=%s,sec=sys"
1396
1397/*
1398 * setup a work entry in the ssc delayed unmount list.
1399 */
1400static __be32 nfsd4_ssc_setup_dul(struct nfsd_net *nn, char *ipaddr,
1401 struct nfsd4_ssc_umount_item **nsui,
1402 struct svc_rqst *rqstp)
1403{
1404 struct nfsd4_ssc_umount_item *ni = NULL;
1405 struct nfsd4_ssc_umount_item *work = NULL;
1406 struct nfsd4_ssc_umount_item *tmp;
1407 DEFINE_WAIT(wait);
1408 __be32 status = 0;
1409
1410 *nsui = NULL;
1411 work = kzalloc(sizeof(*work), GFP_KERNEL);
1412try_again:
1413 spin_lock(&nn->nfsd_ssc_lock);
1414 list_for_each_entry_safe(ni, tmp, &nn->nfsd_ssc_mount_list, nsui_list) {
1415 if (strncmp(ni->nsui_ipaddr, ipaddr, sizeof(ni->nsui_ipaddr)))
1416 continue;
1417 /* found a match */
1418 if (ni->nsui_busy) {
1419 /* wait - and try again */
1420 prepare_to_wait(&nn->nfsd_ssc_waitq, &wait, TASK_IDLE);
1421 spin_unlock(&nn->nfsd_ssc_lock);
1422
1423 /* allow 20secs for mount/unmount for now - revisit */
1424 if (svc_thread_should_stop(rqstp) ||
1425 (schedule_timeout(20*HZ) == 0)) {
1426 finish_wait(&nn->nfsd_ssc_waitq, &wait);
1427 kfree(work);
1428 return nfserr_eagain;
1429 }
1430 finish_wait(&nn->nfsd_ssc_waitq, &wait);
1431 goto try_again;
1432 }
1433 *nsui = ni;
1434 refcount_inc(&ni->nsui_refcnt);
1435 spin_unlock(&nn->nfsd_ssc_lock);
1436 kfree(work);
1437
1438 /* return vfsmount in (*nsui)->nsui_vfsmount */
1439 return 0;
1440 }
1441 if (work) {
1442 strscpy(work->nsui_ipaddr, ipaddr, sizeof(work->nsui_ipaddr) - 1);
1443 refcount_set(&work->nsui_refcnt, 2);
1444 work->nsui_busy = true;
1445 list_add_tail(&work->nsui_list, &nn->nfsd_ssc_mount_list);
1446 *nsui = work;
1447 } else
1448 status = nfserr_resource;
1449 spin_unlock(&nn->nfsd_ssc_lock);
1450 return status;
1451}
1452
1453static void nfsd4_ssc_update_dul(struct nfsd_net *nn,
1454 struct nfsd4_ssc_umount_item *nsui,
1455 struct vfsmount *ss_mnt)
1456{
1457 spin_lock(&nn->nfsd_ssc_lock);
1458 nsui->nsui_vfsmount = ss_mnt;
1459 nsui->nsui_busy = false;
1460 wake_up_all(&nn->nfsd_ssc_waitq);
1461 spin_unlock(&nn->nfsd_ssc_lock);
1462}
1463
1464static void nfsd4_ssc_cancel_dul(struct nfsd_net *nn,
1465 struct nfsd4_ssc_umount_item *nsui)
1466{
1467 spin_lock(&nn->nfsd_ssc_lock);
1468 list_del(&nsui->nsui_list);
1469 wake_up_all(&nn->nfsd_ssc_waitq);
1470 spin_unlock(&nn->nfsd_ssc_lock);
1471 kfree(nsui);
1472}
1473
1474/*
1475 * Support one copy source server for now.
1476 */
1477static __be32
1478nfsd4_interssc_connect(struct nl4_server *nss, struct svc_rqst *rqstp,
1479 struct nfsd4_ssc_umount_item **nsui)
1480{
1481 struct file_system_type *type;
1482 struct vfsmount *ss_mnt;
1483 struct nfs42_netaddr *naddr;
1484 struct sockaddr_storage tmp_addr;
1485 size_t tmp_addrlen, match_netid_len = 3;
1486 char *startsep = "", *endsep = "", *match_netid = "tcp";
1487 char *ipaddr, *dev_name, *raw_data;
1488 int len, raw_len;
1489 __be32 status = nfserr_inval;
1490 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1491
1492 naddr = &nss->u.nl4_addr;
1493 tmp_addrlen = rpc_uaddr2sockaddr(SVC_NET(rqstp), naddr->addr,
1494 naddr->addr_len,
1495 (struct sockaddr *)&tmp_addr,
1496 sizeof(tmp_addr));
1497 *nsui = NULL;
1498 if (tmp_addrlen == 0)
1499 goto out_err;
1500
1501 if (tmp_addr.ss_family == AF_INET6) {
1502 startsep = "[";
1503 endsep = "]";
1504 match_netid = "tcp6";
1505 match_netid_len = 4;
1506 }
1507
1508 if (naddr->netid_len != match_netid_len ||
1509 strncmp(naddr->netid, match_netid, naddr->netid_len))
1510 goto out_err;
1511
1512 /* Construct the raw data for the vfs_kern_mount call */
1513 len = RPC_MAX_ADDRBUFLEN + 1;
1514 ipaddr = kzalloc(len, GFP_KERNEL);
1515 if (!ipaddr)
1516 goto out_err;
1517
1518 rpc_ntop((struct sockaddr *)&tmp_addr, ipaddr, len);
1519
1520 /* 2 for ipv6 endsep and startsep. 3 for ":/" and trailing '/0'*/
1521
1522 raw_len = strlen(NFSD42_INTERSSC_MOUNTOPS) + strlen(ipaddr);
1523 raw_data = kzalloc(raw_len, GFP_KERNEL);
1524 if (!raw_data)
1525 goto out_free_ipaddr;
1526
1527 snprintf(raw_data, raw_len, NFSD42_INTERSSC_MOUNTOPS, ipaddr);
1528
1529 status = nfserr_nodev;
1530 type = get_fs_type("nfs");
1531 if (!type)
1532 goto out_free_rawdata;
1533
1534 /* Set the server:<export> for the vfs_kern_mount call */
1535 dev_name = kzalloc(len + 5, GFP_KERNEL);
1536 if (!dev_name)
1537 goto out_free_rawdata;
1538 snprintf(dev_name, len + 5, "%s%s%s:/", startsep, ipaddr, endsep);
1539
1540 status = nfsd4_ssc_setup_dul(nn, ipaddr, nsui, rqstp);
1541 if (status)
1542 goto out_free_devname;
1543 if ((*nsui)->nsui_vfsmount)
1544 goto out_done;
1545
1546 /* Use an 'internal' mount: SB_KERNMOUNT -> MNT_INTERNAL */
1547 ss_mnt = vfs_kern_mount(type, SB_KERNMOUNT, dev_name, raw_data);
1548 module_put(type->owner);
1549 if (IS_ERR(ss_mnt)) {
1550 status = nfserr_nodev;
1551 nfsd4_ssc_cancel_dul(nn, *nsui);
1552 goto out_free_devname;
1553 }
1554 nfsd4_ssc_update_dul(nn, *nsui, ss_mnt);
1555out_done:
1556 status = 0;
1557
1558out_free_devname:
1559 kfree(dev_name);
1560out_free_rawdata:
1561 kfree(raw_data);
1562out_free_ipaddr:
1563 kfree(ipaddr);
1564out_err:
1565 return status;
1566}
1567
1568/*
1569 * Verify COPY destination stateid.
1570 *
1571 * Connect to the source server with NFSv4.1.
1572 * Create the source struct file for nfsd_copy_range.
1573 * Called with COPY cstate:
1574 * SAVED_FH: source filehandle
1575 * CURRENT_FH: destination filehandle
1576 */
1577static __be32
1578nfsd4_setup_inter_ssc(struct svc_rqst *rqstp,
1579 struct nfsd4_compound_state *cstate,
1580 struct nfsd4_copy *copy)
1581{
1582 struct svc_fh *s_fh = NULL;
1583 stateid_t *s_stid = ©->cp_src_stateid;
1584 __be32 status = nfserr_inval;
1585
1586 /* Verify the destination stateid and set dst struct file*/
1587 status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1588 ©->cp_dst_stateid,
1589 WR_STATE, ©->nf_dst, NULL);
1590 if (status)
1591 goto out;
1592
1593 status = nfsd4_interssc_connect(copy->cp_src, rqstp, ©->ss_nsui);
1594 if (status)
1595 goto out;
1596
1597 s_fh = &cstate->save_fh;
1598
1599 copy->c_fh.size = s_fh->fh_handle.fh_size;
1600 memcpy(copy->c_fh.data, &s_fh->fh_handle.fh_raw, copy->c_fh.size);
1601 copy->stateid.seqid = cpu_to_be32(s_stid->si_generation);
1602 memcpy(copy->stateid.other, (void *)&s_stid->si_opaque,
1603 sizeof(stateid_opaque_t));
1604
1605 status = 0;
1606out:
1607 return status;
1608}
1609
1610static void
1611nfsd4_cleanup_inter_ssc(struct nfsd4_ssc_umount_item *nsui, struct file *filp,
1612 struct nfsd_file *dst)
1613{
1614 struct nfsd_net *nn = net_generic(dst->nf_net, nfsd_net_id);
1615 long timeout = msecs_to_jiffies(nfsd4_ssc_umount_timeout);
1616
1617 nfs42_ssc_close(filp);
1618 fput(filp);
1619
1620 spin_lock(&nn->nfsd_ssc_lock);
1621 list_del(&nsui->nsui_list);
1622 /*
1623 * vfsmount can be shared by multiple exports,
1624 * decrement refcnt. If the count drops to 1 it
1625 * will be unmounted when nsui_expire expires.
1626 */
1627 refcount_dec(&nsui->nsui_refcnt);
1628 nsui->nsui_expire = jiffies + timeout;
1629 list_add_tail(&nsui->nsui_list, &nn->nfsd_ssc_mount_list);
1630 spin_unlock(&nn->nfsd_ssc_lock);
1631}
1632
1633#else /* CONFIG_NFSD_V4_2_INTER_SSC */
1634
1635static __be32
1636nfsd4_setup_inter_ssc(struct svc_rqst *rqstp,
1637 struct nfsd4_compound_state *cstate,
1638 struct nfsd4_copy *copy)
1639{
1640 return nfserr_inval;
1641}
1642
1643static void
1644nfsd4_cleanup_inter_ssc(struct nfsd4_ssc_umount_item *nsui, struct file *filp,
1645 struct nfsd_file *dst)
1646{
1647}
1648
1649static struct file *nfs42_ssc_open(struct vfsmount *ss_mnt,
1650 struct nfs_fh *src_fh,
1651 nfs4_stateid *stateid)
1652{
1653 return NULL;
1654}
1655#endif /* CONFIG_NFSD_V4_2_INTER_SSC */
1656
1657static __be32
1658nfsd4_setup_intra_ssc(struct svc_rqst *rqstp,
1659 struct nfsd4_compound_state *cstate,
1660 struct nfsd4_copy *copy)
1661{
1662 return nfsd4_verify_copy(rqstp, cstate, ©->cp_src_stateid,
1663 ©->nf_src, ©->cp_dst_stateid,
1664 ©->nf_dst);
1665}
1666
1667static void nfsd4_cb_offload_release(struct nfsd4_callback *cb)
1668{
1669 struct nfsd4_cb_offload *cbo =
1670 container_of(cb, struct nfsd4_cb_offload, co_cb);
1671 struct nfsd4_copy *copy =
1672 container_of(cbo, struct nfsd4_copy, cp_cb_offload);
1673
1674 set_bit(NFSD4_COPY_F_OFFLOAD_DONE, ©->cp_flags);
1675}
1676
1677static int nfsd4_cb_offload_done(struct nfsd4_callback *cb,
1678 struct rpc_task *task)
1679{
1680 struct nfsd4_cb_offload *cbo =
1681 container_of(cb, struct nfsd4_cb_offload, co_cb);
1682
1683 trace_nfsd_cb_offload_done(&cbo->co_res.cb_stateid, task);
1684 switch (task->tk_status) {
1685 case -NFS4ERR_DELAY:
1686 if (cbo->co_retries--) {
1687 rpc_delay(task, 1 * HZ);
1688 return 0;
1689 }
1690 }
1691 return 1;
1692}
1693
1694static const struct nfsd4_callback_ops nfsd4_cb_offload_ops = {
1695 .release = nfsd4_cb_offload_release,
1696 .done = nfsd4_cb_offload_done,
1697 .opcode = OP_CB_OFFLOAD,
1698};
1699
1700static void nfsd4_init_copy_res(struct nfsd4_copy *copy, bool sync)
1701{
1702 copy->cp_res.wr_stable_how =
1703 test_bit(NFSD4_COPY_F_COMMITTED, ©->cp_flags) ?
1704 NFS_FILE_SYNC : NFS_UNSTABLE;
1705 nfsd4_copy_set_sync(copy, sync);
1706}
1707
1708static ssize_t _nfsd_copy_file_range(struct nfsd4_copy *copy,
1709 struct file *dst,
1710 struct file *src)
1711{
1712 errseq_t since;
1713 ssize_t bytes_copied = 0;
1714 u64 bytes_total = copy->cp_count;
1715 u64 src_pos = copy->cp_src_pos;
1716 u64 dst_pos = copy->cp_dst_pos;
1717 int status;
1718 loff_t end;
1719
1720 /* See RFC 7862 p.67: */
1721 if (bytes_total == 0)
1722 bytes_total = ULLONG_MAX;
1723 do {
1724 /* Only async copies can be stopped here */
1725 if (kthread_should_stop())
1726 break;
1727 bytes_copied = nfsd_copy_file_range(src, src_pos, dst, dst_pos,
1728 bytes_total);
1729 if (bytes_copied <= 0)
1730 break;
1731 bytes_total -= bytes_copied;
1732 copy->cp_res.wr_bytes_written += bytes_copied;
1733 src_pos += bytes_copied;
1734 dst_pos += bytes_copied;
1735 } while (bytes_total > 0 && nfsd4_copy_is_async(copy));
1736 /* for a non-zero asynchronous copy do a commit of data */
1737 if (nfsd4_copy_is_async(copy) && copy->cp_res.wr_bytes_written > 0) {
1738 since = READ_ONCE(dst->f_wb_err);
1739 end = copy->cp_dst_pos + copy->cp_res.wr_bytes_written - 1;
1740 status = vfs_fsync_range(dst, copy->cp_dst_pos, end, 0);
1741 if (!status)
1742 status = filemap_check_wb_err(dst->f_mapping, since);
1743 if (!status)
1744 set_bit(NFSD4_COPY_F_COMMITTED, ©->cp_flags);
1745 }
1746 return bytes_copied;
1747}
1748
1749static __be32 nfsd4_do_copy(struct nfsd4_copy *copy,
1750 struct file *src, struct file *dst,
1751 bool sync)
1752{
1753 __be32 status;
1754 ssize_t bytes;
1755
1756 bytes = _nfsd_copy_file_range(copy, dst, src);
1757
1758 /* for async copy, we ignore the error, client can always retry
1759 * to get the error
1760 */
1761 if (bytes < 0 && !copy->cp_res.wr_bytes_written)
1762 status = nfserrno(bytes);
1763 else {
1764 nfsd4_init_copy_res(copy, sync);
1765 status = nfs_ok;
1766 }
1767 return status;
1768}
1769
1770static void dup_copy_fields(struct nfsd4_copy *src, struct nfsd4_copy *dst)
1771{
1772 dst->cp_src_pos = src->cp_src_pos;
1773 dst->cp_dst_pos = src->cp_dst_pos;
1774 dst->cp_count = src->cp_count;
1775 dst->cp_flags = src->cp_flags;
1776 memcpy(&dst->cp_res, &src->cp_res, sizeof(src->cp_res));
1777 memcpy(&dst->fh, &src->fh, sizeof(src->fh));
1778 dst->cp_clp = src->cp_clp;
1779 dst->nf_dst = nfsd_file_get(src->nf_dst);
1780 /* for inter, nf_src doesn't exist yet */
1781 if (!nfsd4_ssc_is_inter(src))
1782 dst->nf_src = nfsd_file_get(src->nf_src);
1783
1784 memcpy(&dst->cp_stateid, &src->cp_stateid, sizeof(src->cp_stateid));
1785 memcpy(dst->cp_src, src->cp_src, sizeof(struct nl4_server));
1786 memcpy(&dst->stateid, &src->stateid, sizeof(src->stateid));
1787 memcpy(&dst->c_fh, &src->c_fh, sizeof(src->c_fh));
1788 dst->ss_nsui = src->ss_nsui;
1789}
1790
1791static void release_copy_files(struct nfsd4_copy *copy)
1792{
1793 if (copy->nf_src)
1794 nfsd_file_put(copy->nf_src);
1795 if (copy->nf_dst)
1796 nfsd_file_put(copy->nf_dst);
1797}
1798
1799static void cleanup_async_copy(struct nfsd4_copy *copy)
1800{
1801 nfs4_free_copy_state(copy);
1802 release_copy_files(copy);
1803 if (copy->cp_clp) {
1804 spin_lock(©->cp_clp->async_lock);
1805 if (!list_empty(©->copies))
1806 list_del_init(©->copies);
1807 spin_unlock(©->cp_clp->async_lock);
1808 }
1809 nfs4_put_copy(copy);
1810}
1811
1812static void nfsd4_send_cb_offload(struct nfsd4_copy *copy)
1813{
1814 struct nfsd4_cb_offload *cbo = ©->cp_cb_offload;
1815
1816 memcpy(&cbo->co_res, ©->cp_res, sizeof(copy->cp_res));
1817 memcpy(&cbo->co_fh, ©->fh, sizeof(copy->fh));
1818 cbo->co_nfserr = copy->nfserr;
1819 cbo->co_retries = 5;
1820
1821 nfsd4_init_cb(&cbo->co_cb, copy->cp_clp, &nfsd4_cb_offload_ops,
1822 NFSPROC4_CLNT_CB_OFFLOAD);
1823 trace_nfsd_cb_offload(copy->cp_clp, &cbo->co_res.cb_stateid,
1824 &cbo->co_fh, copy->cp_count, copy->nfserr);
1825 nfsd4_run_cb(&cbo->co_cb);
1826}
1827
1828/**
1829 * nfsd4_do_async_copy - kthread function for background server-side COPY
1830 * @data: arguments for COPY operation
1831 *
1832 * Return values:
1833 * %0: Copy operation is done.
1834 */
1835static int nfsd4_do_async_copy(void *data)
1836{
1837 struct nfsd4_copy *copy = (struct nfsd4_copy *)data;
1838
1839 trace_nfsd_copy_async(copy);
1840 if (nfsd4_ssc_is_inter(copy)) {
1841 struct file *filp;
1842
1843 filp = nfs42_ssc_open(copy->ss_nsui->nsui_vfsmount,
1844 ©->c_fh, ©->stateid);
1845 if (IS_ERR(filp)) {
1846 switch (PTR_ERR(filp)) {
1847 case -EBADF:
1848 copy->nfserr = nfserr_wrong_type;
1849 break;
1850 default:
1851 copy->nfserr = nfserr_offload_denied;
1852 }
1853 /* ss_mnt will be unmounted by the laundromat */
1854 goto do_callback;
1855 }
1856 copy->nfserr = nfsd4_do_copy(copy, filp, copy->nf_dst->nf_file,
1857 false);
1858 nfsd4_cleanup_inter_ssc(copy->ss_nsui, filp, copy->nf_dst);
1859 } else {
1860 copy->nfserr = nfsd4_do_copy(copy, copy->nf_src->nf_file,
1861 copy->nf_dst->nf_file, false);
1862 }
1863
1864do_callback:
1865 /* The kthread exits forthwith. Ensure that a subsequent
1866 * OFFLOAD_CANCEL won't try to kill it again. */
1867 set_bit(NFSD4_COPY_F_STOPPED, ©->cp_flags);
1868
1869 set_bit(NFSD4_COPY_F_COMPLETED, ©->cp_flags);
1870 trace_nfsd_copy_async_done(copy);
1871 nfsd4_send_cb_offload(copy);
1872 atomic_dec(©->cp_nn->pending_async_copies);
1873 return 0;
1874}
1875
1876static __be32
1877nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1878 union nfsd4_op_u *u)
1879{
1880 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1881 struct nfsd4_copy *async_copy = NULL;
1882 struct nfsd4_copy *copy = &u->copy;
1883 struct nfsd42_write_res *result;
1884 __be32 status;
1885
1886 /*
1887 * Currently, async COPY is not reliable. Force all COPY
1888 * requests to be synchronous to avoid client application
1889 * hangs waiting for COPY completion.
1890 */
1891 nfsd4_copy_set_sync(copy, true);
1892
1893 result = ©->cp_res;
1894 nfsd_copy_write_verifier((__be32 *)&result->wr_verifier.data, nn);
1895
1896 copy->cp_clp = cstate->clp;
1897 if (nfsd4_ssc_is_inter(copy)) {
1898 trace_nfsd_copy_inter(copy);
1899 if (!inter_copy_offload_enable || nfsd4_copy_is_sync(copy)) {
1900 status = nfserr_notsupp;
1901 goto out;
1902 }
1903 status = nfsd4_setup_inter_ssc(rqstp, cstate, copy);
1904 if (status) {
1905 trace_nfsd_copy_done(copy, status);
1906 return nfserr_offload_denied;
1907 }
1908 } else {
1909 trace_nfsd_copy_intra(copy);
1910 status = nfsd4_setup_intra_ssc(rqstp, cstate, copy);
1911 if (status) {
1912 trace_nfsd_copy_done(copy, status);
1913 return status;
1914 }
1915 }
1916
1917 memcpy(©->fh, &cstate->current_fh.fh_handle,
1918 sizeof(struct knfsd_fh));
1919 if (nfsd4_copy_is_async(copy)) {
1920 async_copy = kzalloc(sizeof(struct nfsd4_copy), GFP_KERNEL);
1921 if (!async_copy)
1922 goto out_err;
1923 async_copy->cp_nn = nn;
1924 INIT_LIST_HEAD(&async_copy->copies);
1925 refcount_set(&async_copy->refcount, 1);
1926 async_copy->cp_ttl = NFSD_COPY_INITIAL_TTL;
1927 /* Arbitrary cap on number of pending async copy operations */
1928 if (atomic_inc_return(&nn->pending_async_copies) >
1929 (int)rqstp->rq_pool->sp_nrthreads)
1930 goto out_dec_async_copy_err;
1931 async_copy->cp_src = kmalloc(sizeof(*async_copy->cp_src), GFP_KERNEL);
1932 if (!async_copy->cp_src)
1933 goto out_dec_async_copy_err;
1934 if (!nfs4_init_copy_state(nn, copy))
1935 goto out_dec_async_copy_err;
1936 memcpy(&result->cb_stateid, ©->cp_stateid.cs_stid,
1937 sizeof(result->cb_stateid));
1938 dup_copy_fields(copy, async_copy);
1939 async_copy->copy_task = kthread_create(nfsd4_do_async_copy,
1940 async_copy, "%s", "copy thread");
1941 if (IS_ERR(async_copy->copy_task))
1942 goto out_dec_async_copy_err;
1943 spin_lock(&async_copy->cp_clp->async_lock);
1944 list_add(&async_copy->copies,
1945 &async_copy->cp_clp->async_copies);
1946 spin_unlock(&async_copy->cp_clp->async_lock);
1947 wake_up_process(async_copy->copy_task);
1948 status = nfs_ok;
1949 } else {
1950 status = nfsd4_do_copy(copy, copy->nf_src->nf_file,
1951 copy->nf_dst->nf_file, true);
1952 }
1953out:
1954 trace_nfsd_copy_done(copy, status);
1955 release_copy_files(copy);
1956 return status;
1957out_dec_async_copy_err:
1958 if (async_copy)
1959 atomic_dec(&nn->pending_async_copies);
1960out_err:
1961 if (nfsd4_ssc_is_inter(copy)) {
1962 /*
1963 * Source's vfsmount of inter-copy will be unmounted
1964 * by the laundromat. Use copy instead of async_copy
1965 * since async_copy->ss_nsui might not be set yet.
1966 */
1967 refcount_dec(©->ss_nsui->nsui_refcnt);
1968 }
1969 if (async_copy)
1970 cleanup_async_copy(async_copy);
1971 status = nfserr_jukebox;
1972 goto out;
1973}
1974
1975static struct nfsd4_copy *
1976find_async_copy_locked(struct nfs4_client *clp, stateid_t *stateid)
1977{
1978 struct nfsd4_copy *copy;
1979
1980 lockdep_assert_held(&clp->async_lock);
1981
1982 list_for_each_entry(copy, &clp->async_copies, copies) {
1983 if (memcmp(©->cp_stateid.cs_stid, stateid, NFS4_STATEID_SIZE))
1984 continue;
1985 return copy;
1986 }
1987 return NULL;
1988}
1989
1990static struct nfsd4_copy *
1991find_async_copy(struct nfs4_client *clp, stateid_t *stateid)
1992{
1993 struct nfsd4_copy *copy;
1994
1995 spin_lock(&clp->async_lock);
1996 copy = find_async_copy_locked(clp, stateid);
1997 if (copy)
1998 refcount_inc(©->refcount);
1999 spin_unlock(&clp->async_lock);
2000 return copy;
2001}
2002
2003static __be32
2004nfsd4_offload_cancel(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 struct nfsd4_copy *copy;
2010 struct nfs4_client *clp = cstate->clp;
2011
2012 copy = find_async_copy(clp, &os->stateid);
2013 if (!copy) {
2014 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2015
2016 return manage_cpntf_state(nn, &os->stateid, clp, NULL);
2017 } else
2018 nfsd4_stop_copy(copy);
2019
2020 return nfs_ok;
2021}
2022
2023static __be32
2024nfsd4_copy_notify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2025 union nfsd4_op_u *u)
2026{
2027 struct nfsd4_copy_notify *cn = &u->copy_notify;
2028 __be32 status;
2029 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2030 struct nfs4_stid *stid = NULL;
2031 struct nfs4_cpntf_state *cps;
2032 struct nfs4_client *clp = cstate->clp;
2033
2034 status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
2035 &cn->cpn_src_stateid, RD_STATE, NULL,
2036 &stid);
2037 if (status)
2038 return status;
2039 if (!stid)
2040 return nfserr_bad_stateid;
2041
2042 cn->cpn_lease_time.tv_sec = nn->nfsd4_lease;
2043 cn->cpn_lease_time.tv_nsec = 0;
2044
2045 status = nfserrno(-ENOMEM);
2046 cps = nfs4_alloc_init_cpntf_state(nn, stid);
2047 if (!cps)
2048 goto out;
2049 memcpy(&cn->cpn_cnr_stateid, &cps->cp_stateid.cs_stid, sizeof(stateid_t));
2050 memcpy(&cps->cp_p_stateid, &stid->sc_stateid, sizeof(stateid_t));
2051 memcpy(&cps->cp_p_clid, &clp->cl_clientid, sizeof(clientid_t));
2052
2053 /* For now, only return one server address in cpn_src, the
2054 * address used by the client to connect to this server.
2055 */
2056 cn->cpn_src->nl4_type = NL4_NETADDR;
2057 status = nfsd4_set_netaddr((struct sockaddr *)&rqstp->rq_daddr,
2058 &cn->cpn_src->u.nl4_addr);
2059 WARN_ON_ONCE(status);
2060 if (status) {
2061 nfs4_put_cpntf_state(nn, cps);
2062 goto out;
2063 }
2064out:
2065 nfs4_put_stid(stid);
2066 return status;
2067}
2068
2069static __be32
2070nfsd4_fallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2071 struct nfsd4_fallocate *fallocate, int flags)
2072{
2073 __be32 status;
2074 struct nfsd_file *nf;
2075
2076 status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
2077 &fallocate->falloc_stateid,
2078 WR_STATE, &nf, NULL);
2079 if (status != nfs_ok)
2080 return status;
2081
2082 status = nfsd4_vfs_fallocate(rqstp, &cstate->current_fh, nf->nf_file,
2083 fallocate->falloc_offset,
2084 fallocate->falloc_length,
2085 flags);
2086 nfsd_file_put(nf);
2087 return status;
2088}
2089
2090static __be32
2091nfsd4_offload_status(struct svc_rqst *rqstp,
2092 struct nfsd4_compound_state *cstate,
2093 union nfsd4_op_u *u)
2094{
2095 struct nfsd4_offload_status *os = &u->offload_status;
2096 __be32 status = nfs_ok;
2097 struct nfsd4_copy *copy;
2098 struct nfs4_client *clp = cstate->clp;
2099
2100 os->completed = false;
2101 spin_lock(&clp->async_lock);
2102 copy = find_async_copy_locked(clp, &os->stateid);
2103 if (copy) {
2104 os->count = copy->cp_res.wr_bytes_written;
2105 if (test_bit(NFSD4_COPY_F_COMPLETED, ©->cp_flags)) {
2106 os->completed = true;
2107 os->status = copy->nfserr;
2108 }
2109 } else
2110 status = nfserr_bad_stateid;
2111 spin_unlock(&clp->async_lock);
2112
2113 return status;
2114}
2115
2116static __be32
2117nfsd4_allocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2118 union nfsd4_op_u *u)
2119{
2120 return nfsd4_fallocate(rqstp, cstate, &u->allocate, 0);
2121}
2122
2123static __be32
2124nfsd4_deallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2125 union nfsd4_op_u *u)
2126{
2127 return nfsd4_fallocate(rqstp, cstate, &u->deallocate,
2128 FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE);
2129}
2130
2131static __be32
2132nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2133 union nfsd4_op_u *u)
2134{
2135 struct nfsd4_seek *seek = &u->seek;
2136 int whence;
2137 __be32 status;
2138 struct nfsd_file *nf;
2139
2140 status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
2141 &seek->seek_stateid,
2142 RD_STATE, &nf, NULL);
2143 if (status)
2144 return status;
2145
2146 switch (seek->seek_whence) {
2147 case NFS4_CONTENT_DATA:
2148 whence = SEEK_DATA;
2149 break;
2150 case NFS4_CONTENT_HOLE:
2151 whence = SEEK_HOLE;
2152 break;
2153 default:
2154 status = nfserr_union_notsupp;
2155 goto out;
2156 }
2157
2158 /*
2159 * Note: This call does change file->f_pos, but nothing in NFSD
2160 * should ever file->f_pos.
2161 */
2162 seek->seek_pos = vfs_llseek(nf->nf_file, seek->seek_offset, whence);
2163 if (seek->seek_pos < 0)
2164 status = nfserrno(seek->seek_pos);
2165 else if (seek->seek_pos >= i_size_read(file_inode(nf->nf_file)))
2166 seek->seek_eof = true;
2167
2168out:
2169 nfsd_file_put(nf);
2170 return status;
2171}
2172
2173/* This routine never returns NFS_OK! If there are no other errors, it
2174 * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
2175 * attributes matched. VERIFY is implemented by mapping NFSERR_SAME
2176 * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
2177 */
2178static __be32
2179_nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2180 struct nfsd4_verify *verify)
2181{
2182 __be32 *buf, *p;
2183 int count;
2184 __be32 status;
2185
2186 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
2187 if (status)
2188 return status;
2189
2190 status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
2191 if (status)
2192 return status;
2193
2194 if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
2195 || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
2196 return nfserr_inval;
2197 if (verify->ve_attrlen & 3)
2198 return nfserr_inval;
2199
2200 /* count in words:
2201 * bitmap_len(1) + bitmap(2) + attr_len(1) = 4
2202 */
2203 count = 4 + (verify->ve_attrlen >> 2);
2204 buf = kmalloc(count << 2, GFP_KERNEL);
2205 if (!buf)
2206 return nfserr_jukebox;
2207
2208 p = buf;
2209 status = nfsd4_encode_fattr_to_buf(&p, count, &cstate->current_fh,
2210 cstate->current_fh.fh_export,
2211 cstate->current_fh.fh_dentry,
2212 verify->ve_bmval,
2213 rqstp, 0);
2214 /*
2215 * If nfsd4_encode_fattr() ran out of space, assume that's because
2216 * the attributes are longer (hence different) than those given:
2217 */
2218 if (status == nfserr_resource)
2219 status = nfserr_not_same;
2220 if (status)
2221 goto out_kfree;
2222
2223 /* skip bitmap */
2224 p = buf + 1 + ntohl(buf[0]);
2225 status = nfserr_not_same;
2226 if (ntohl(*p++) != verify->ve_attrlen)
2227 goto out_kfree;
2228 if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
2229 status = nfserr_same;
2230
2231out_kfree:
2232 kfree(buf);
2233 return status;
2234}
2235
2236static __be32
2237nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2238 union nfsd4_op_u *u)
2239{
2240 __be32 status;
2241
2242 status = _nfsd4_verify(rqstp, cstate, &u->verify);
2243 return status == nfserr_not_same ? nfs_ok : status;
2244}
2245
2246static __be32
2247nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2248 union nfsd4_op_u *u)
2249{
2250 __be32 status;
2251
2252 status = _nfsd4_verify(rqstp, cstate, &u->nverify);
2253 return status == nfserr_same ? nfs_ok : status;
2254}
2255
2256static __be32
2257nfsd4_get_dir_delegation(struct svc_rqst *rqstp,
2258 struct nfsd4_compound_state *cstate,
2259 union nfsd4_op_u *u)
2260{
2261 struct nfsd4_get_dir_delegation *gdd = &u->get_dir_delegation;
2262
2263 /*
2264 * RFC 8881, section 18.39.3 says:
2265 *
2266 * "The server may refuse to grant the delegation. In that case, the
2267 * server will return NFS4ERR_DIRDELEG_UNAVAIL."
2268 *
2269 * This is sub-optimal, since it means that the server would need to
2270 * abort compound processing just because the delegation wasn't
2271 * available. RFC8881bis should change this to allow the server to
2272 * return NFS4_OK with a non-fatal status of GDD4_UNAVAIL in this
2273 * situation.
2274 */
2275 gdd->gddrnf_status = GDD4_UNAVAIL;
2276 return nfs_ok;
2277}
2278
2279#ifdef CONFIG_NFSD_PNFS
2280static const struct nfsd4_layout_ops *
2281nfsd4_layout_verify(struct svc_export *exp, unsigned int layout_type)
2282{
2283 if (!exp->ex_layout_types) {
2284 dprintk("%s: export does not support pNFS\n", __func__);
2285 return NULL;
2286 }
2287
2288 if (layout_type >= LAYOUT_TYPE_MAX ||
2289 !(exp->ex_layout_types & (1 << layout_type))) {
2290 dprintk("%s: layout type %d not supported\n",
2291 __func__, layout_type);
2292 return NULL;
2293 }
2294
2295 return nfsd4_layout_ops[layout_type];
2296}
2297
2298static __be32
2299nfsd4_getdeviceinfo(struct svc_rqst *rqstp,
2300 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
2301{
2302 struct nfsd4_getdeviceinfo *gdp = &u->getdeviceinfo;
2303 const struct nfsd4_layout_ops *ops;
2304 struct nfsd4_deviceid_map *map;
2305 struct svc_export *exp;
2306 __be32 nfserr;
2307
2308 dprintk("%s: layout_type %u dev_id [0x%llx:0x%x] maxcnt %u\n",
2309 __func__,
2310 gdp->gd_layout_type,
2311 gdp->gd_devid.fsid_idx, gdp->gd_devid.generation,
2312 gdp->gd_maxcount);
2313
2314 map = nfsd4_find_devid_map(gdp->gd_devid.fsid_idx);
2315 if (!map) {
2316 dprintk("%s: couldn't find device ID to export mapping!\n",
2317 __func__);
2318 return nfserr_noent;
2319 }
2320
2321 exp = rqst_exp_find(&rqstp->rq_chandle, SVC_NET(rqstp),
2322 rqstp->rq_client, rqstp->rq_gssclient,
2323 map->fsid_type, map->fsid);
2324 if (IS_ERR(exp)) {
2325 dprintk("%s: could not find device id\n", __func__);
2326 return nfserr_noent;
2327 }
2328
2329 nfserr = nfserr_layoutunavailable;
2330 ops = nfsd4_layout_verify(exp, gdp->gd_layout_type);
2331 if (!ops)
2332 goto out;
2333
2334 nfserr = nfs_ok;
2335 if (gdp->gd_maxcount != 0) {
2336 nfserr = ops->proc_getdeviceinfo(exp->ex_path.mnt->mnt_sb,
2337 rqstp, cstate->clp, gdp);
2338 }
2339
2340 gdp->gd_notify_types &= ops->notify_types;
2341out:
2342 exp_put(exp);
2343 return nfserr;
2344}
2345
2346static void
2347nfsd4_getdeviceinfo_release(union nfsd4_op_u *u)
2348{
2349 kfree(u->getdeviceinfo.gd_device);
2350}
2351
2352static __be32
2353nfsd4_layoutget(struct svc_rqst *rqstp,
2354 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
2355{
2356 struct nfsd4_layoutget *lgp = &u->layoutget;
2357 struct svc_fh *current_fh = &cstate->current_fh;
2358 const struct nfsd4_layout_ops *ops;
2359 struct nfs4_layout_stateid *ls;
2360 __be32 nfserr;
2361 int accmode = NFSD_MAY_READ_IF_EXEC | NFSD_MAY_OWNER_OVERRIDE;
2362
2363 switch (lgp->lg_seg.iomode) {
2364 case IOMODE_READ:
2365 accmode |= NFSD_MAY_READ;
2366 break;
2367 case IOMODE_RW:
2368 accmode |= NFSD_MAY_READ | NFSD_MAY_WRITE;
2369 break;
2370 default:
2371 dprintk("%s: invalid iomode %d\n",
2372 __func__, lgp->lg_seg.iomode);
2373 nfserr = nfserr_badiomode;
2374 goto out;
2375 }
2376
2377 nfserr = fh_verify(rqstp, current_fh, 0, accmode);
2378 if (nfserr)
2379 goto out;
2380
2381 nfserr = nfserr_layoutunavailable;
2382 ops = nfsd4_layout_verify(current_fh->fh_export, lgp->lg_layout_type);
2383 if (!ops)
2384 goto out;
2385
2386 /*
2387 * Verify minlength and range as per RFC5661:
2388 * o If loga_length is less than loga_minlength,
2389 * the metadata server MUST return NFS4ERR_INVAL.
2390 * o If the sum of loga_offset and loga_minlength exceeds
2391 * NFS4_UINT64_MAX, and loga_minlength is not
2392 * NFS4_UINT64_MAX, the error NFS4ERR_INVAL MUST result.
2393 * o If the sum of loga_offset and loga_length exceeds
2394 * NFS4_UINT64_MAX, and loga_length is not NFS4_UINT64_MAX,
2395 * the error NFS4ERR_INVAL MUST result.
2396 */
2397 nfserr = nfserr_inval;
2398 if (lgp->lg_seg.length < lgp->lg_minlength ||
2399 (lgp->lg_minlength != NFS4_MAX_UINT64 &&
2400 lgp->lg_minlength > NFS4_MAX_UINT64 - lgp->lg_seg.offset) ||
2401 (lgp->lg_seg.length != NFS4_MAX_UINT64 &&
2402 lgp->lg_seg.length > NFS4_MAX_UINT64 - lgp->lg_seg.offset))
2403 goto out;
2404 if (lgp->lg_seg.length == 0)
2405 goto out;
2406
2407 nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lgp->lg_sid,
2408 true, lgp->lg_layout_type, &ls);
2409 if (nfserr) {
2410 trace_nfsd_layout_get_lookup_fail(&lgp->lg_sid);
2411 goto out;
2412 }
2413
2414 nfserr = nfserr_recallconflict;
2415 if (atomic_read(&ls->ls_stid.sc_file->fi_lo_recalls))
2416 goto out_put_stid;
2417
2418 nfserr = ops->proc_layoutget(d_inode(current_fh->fh_dentry),
2419 current_fh, lgp);
2420 if (nfserr)
2421 goto out_put_stid;
2422
2423 nfserr = nfsd4_insert_layout(lgp, ls);
2424
2425out_put_stid:
2426 mutex_unlock(&ls->ls_mutex);
2427 nfs4_put_stid(&ls->ls_stid);
2428out:
2429 return nfserr;
2430}
2431
2432static void
2433nfsd4_layoutget_release(union nfsd4_op_u *u)
2434{
2435 kfree(u->layoutget.lg_content);
2436}
2437
2438static __be32
2439nfsd4_layoutcommit(struct svc_rqst *rqstp,
2440 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
2441{
2442 struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
2443 const struct nfsd4_layout_seg *seg = &lcp->lc_seg;
2444 struct svc_fh *current_fh = &cstate->current_fh;
2445 const struct nfsd4_layout_ops *ops;
2446 loff_t new_size = lcp->lc_last_wr + 1;
2447 struct inode *inode;
2448 struct nfs4_layout_stateid *ls;
2449 __be32 nfserr;
2450
2451 nfserr = fh_verify(rqstp, current_fh, 0,
2452 NFSD_MAY_WRITE | NFSD_MAY_OWNER_OVERRIDE);
2453 if (nfserr)
2454 goto out;
2455
2456 nfserr = nfserr_layoutunavailable;
2457 ops = nfsd4_layout_verify(current_fh->fh_export, lcp->lc_layout_type);
2458 if (!ops)
2459 goto out;
2460 inode = d_inode(current_fh->fh_dentry);
2461
2462 nfserr = nfserr_inval;
2463 if (new_size <= seg->offset) {
2464 dprintk("pnfsd: last write before layout segment\n");
2465 goto out;
2466 }
2467 if (new_size > seg->offset + seg->length) {
2468 dprintk("pnfsd: last write beyond layout segment\n");
2469 goto out;
2470 }
2471 if (!lcp->lc_newoffset && new_size > i_size_read(inode)) {
2472 dprintk("pnfsd: layoutcommit beyond EOF\n");
2473 goto out;
2474 }
2475
2476 nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lcp->lc_sid,
2477 false, lcp->lc_layout_type,
2478 &ls);
2479 if (nfserr) {
2480 trace_nfsd_layout_commit_lookup_fail(&lcp->lc_sid);
2481 /* fixup error code as per RFC5661 */
2482 if (nfserr == nfserr_bad_stateid)
2483 nfserr = nfserr_badlayout;
2484 goto out;
2485 }
2486
2487 /* LAYOUTCOMMIT does not require any serialization */
2488 mutex_unlock(&ls->ls_mutex);
2489
2490 if (new_size > i_size_read(inode)) {
2491 lcp->lc_size_chg = true;
2492 lcp->lc_newsize = new_size;
2493 } else {
2494 lcp->lc_size_chg = false;
2495 }
2496
2497 nfserr = ops->proc_layoutcommit(inode, lcp);
2498 nfs4_put_stid(&ls->ls_stid);
2499out:
2500 return nfserr;
2501}
2502
2503static __be32
2504nfsd4_layoutreturn(struct svc_rqst *rqstp,
2505 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
2506{
2507 struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
2508 struct svc_fh *current_fh = &cstate->current_fh;
2509 __be32 nfserr;
2510
2511 nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_NOP);
2512 if (nfserr)
2513 goto out;
2514
2515 nfserr = nfserr_layoutunavailable;
2516 if (!nfsd4_layout_verify(current_fh->fh_export, lrp->lr_layout_type))
2517 goto out;
2518
2519 switch (lrp->lr_seg.iomode) {
2520 case IOMODE_READ:
2521 case IOMODE_RW:
2522 case IOMODE_ANY:
2523 break;
2524 default:
2525 dprintk("%s: invalid iomode %d\n", __func__,
2526 lrp->lr_seg.iomode);
2527 nfserr = nfserr_inval;
2528 goto out;
2529 }
2530
2531 switch (lrp->lr_return_type) {
2532 case RETURN_FILE:
2533 nfserr = nfsd4_return_file_layouts(rqstp, cstate, lrp);
2534 break;
2535 case RETURN_FSID:
2536 case RETURN_ALL:
2537 nfserr = nfsd4_return_client_layouts(rqstp, cstate, lrp);
2538 break;
2539 default:
2540 dprintk("%s: invalid return_type %d\n", __func__,
2541 lrp->lr_return_type);
2542 nfserr = nfserr_inval;
2543 break;
2544 }
2545out:
2546 return nfserr;
2547}
2548#endif /* CONFIG_NFSD_PNFS */
2549
2550static __be32
2551nfsd4_getxattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2552 union nfsd4_op_u *u)
2553{
2554 struct nfsd4_getxattr *getxattr = &u->getxattr;
2555
2556 return nfsd_getxattr(rqstp, &cstate->current_fh,
2557 getxattr->getxa_name, &getxattr->getxa_buf,
2558 &getxattr->getxa_len);
2559}
2560
2561static __be32
2562nfsd4_setxattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2563 union nfsd4_op_u *u)
2564{
2565 struct nfsd4_setxattr *setxattr = &u->setxattr;
2566 __be32 ret;
2567
2568 if (opens_in_grace(SVC_NET(rqstp)))
2569 return nfserr_grace;
2570
2571 ret = nfsd_setxattr(rqstp, &cstate->current_fh, setxattr->setxa_name,
2572 setxattr->setxa_buf, setxattr->setxa_len,
2573 setxattr->setxa_flags);
2574
2575 if (!ret)
2576 set_change_info(&setxattr->setxa_cinfo, &cstate->current_fh);
2577
2578 return ret;
2579}
2580
2581static __be32
2582nfsd4_listxattrs(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2583 union nfsd4_op_u *u)
2584{
2585 /*
2586 * Get the entire list, then copy out only the user attributes
2587 * in the encode function.
2588 */
2589 return nfsd_listxattr(rqstp, &cstate->current_fh,
2590 &u->listxattrs.lsxa_buf, &u->listxattrs.lsxa_len);
2591}
2592
2593static __be32
2594nfsd4_removexattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2595 union nfsd4_op_u *u)
2596{
2597 struct nfsd4_removexattr *removexattr = &u->removexattr;
2598 __be32 ret;
2599
2600 if (opens_in_grace(SVC_NET(rqstp)))
2601 return nfserr_grace;
2602
2603 ret = nfsd_removexattr(rqstp, &cstate->current_fh,
2604 removexattr->rmxa_name);
2605
2606 if (!ret)
2607 set_change_info(&removexattr->rmxa_cinfo, &cstate->current_fh);
2608
2609 return ret;
2610}
2611
2612/*
2613 * NULL call.
2614 */
2615static __be32
2616nfsd4_proc_null(struct svc_rqst *rqstp)
2617{
2618 return rpc_success;
2619}
2620
2621static inline void nfsd4_increment_op_stats(struct nfsd_net *nn, u32 opnum)
2622{
2623 if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
2624 percpu_counter_inc(&nn->counter[NFSD_STATS_NFS4_OP(opnum)]);
2625}
2626
2627static const struct nfsd4_operation nfsd4_ops[];
2628
2629static const char *nfsd4_op_name(unsigned opnum);
2630
2631/*
2632 * Enforce NFSv4.1 COMPOUND ordering rules:
2633 *
2634 * Also note, enforced elsewhere:
2635 * - SEQUENCE other than as first op results in
2636 * NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
2637 * - BIND_CONN_TO_SESSION must be the only op in its compound.
2638 * (Enforced in nfsd4_bind_conn_to_session().)
2639 * - DESTROY_SESSION must be the final operation in a compound, if
2640 * sessionid's in SEQUENCE and DESTROY_SESSION are the same.
2641 * (Enforced in nfsd4_destroy_session().)
2642 */
2643static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
2644{
2645 struct nfsd4_op *first_op = &args->ops[0];
2646
2647 /* These ordering requirements don't apply to NFSv4.0: */
2648 if (args->minorversion == 0)
2649 return nfs_ok;
2650 /* This is weird, but OK, not our problem: */
2651 if (args->opcnt == 0)
2652 return nfs_ok;
2653 if (first_op->status == nfserr_op_illegal)
2654 return nfs_ok;
2655 if (!(nfsd4_ops[first_op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
2656 return nfserr_op_not_in_session;
2657 if (first_op->opnum == OP_SEQUENCE)
2658 return nfs_ok;
2659 /*
2660 * So first_op is something allowed outside a session, like
2661 * EXCHANGE_ID; but then it has to be the only op in the
2662 * compound:
2663 */
2664 if (args->opcnt != 1)
2665 return nfserr_not_only_op;
2666 return nfs_ok;
2667}
2668
2669const struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
2670{
2671 return &nfsd4_ops[op->opnum];
2672}
2673
2674bool nfsd4_cache_this_op(struct nfsd4_op *op)
2675{
2676 if (op->opnum == OP_ILLEGAL)
2677 return false;
2678 return OPDESC(op)->op_flags & OP_CACHEME;
2679}
2680
2681static bool need_wrongsec_check(struct svc_rqst *rqstp)
2682{
2683 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2684 struct nfsd4_compoundargs *argp = rqstp->rq_argp;
2685 struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
2686 struct nfsd4_op *next = &argp->ops[resp->opcnt];
2687 const struct nfsd4_operation *thisd = OPDESC(this);
2688 const struct nfsd4_operation *nextd;
2689
2690 /*
2691 * Most ops check wronsec on our own; only the putfh-like ops
2692 * have special rules.
2693 */
2694 if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
2695 return false;
2696 /*
2697 * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
2698 * put-filehandle operation if we're not going to use the
2699 * result:
2700 */
2701 if (argp->opcnt == resp->opcnt)
2702 return false;
2703 if (next->opnum == OP_ILLEGAL)
2704 return false;
2705 nextd = OPDESC(next);
2706 /*
2707 * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
2708 * errors themselves as necessary; others should check for them
2709 * now:
2710 */
2711 return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
2712}
2713
2714#ifdef CONFIG_NFSD_V4_2_INTER_SSC
2715static void
2716check_if_stalefh_allowed(struct nfsd4_compoundargs *args)
2717{
2718 struct nfsd4_op *op, *current_op = NULL, *saved_op = NULL;
2719 struct nfsd4_copy *copy;
2720 struct nfsd4_putfh *putfh;
2721 int i;
2722
2723 /* traverse all operation and if it's a COPY compound, mark the
2724 * source filehandle to skip verification
2725 */
2726 for (i = 0; i < args->opcnt; i++) {
2727 op = &args->ops[i];
2728 if (op->opnum == OP_PUTFH)
2729 current_op = op;
2730 else if (op->opnum == OP_SAVEFH)
2731 saved_op = current_op;
2732 else if (op->opnum == OP_RESTOREFH)
2733 current_op = saved_op;
2734 else if (op->opnum == OP_COPY) {
2735 copy = (struct nfsd4_copy *)&op->u;
2736 if (!saved_op) {
2737 op->status = nfserr_nofilehandle;
2738 return;
2739 }
2740 putfh = (struct nfsd4_putfh *)&saved_op->u;
2741 if (nfsd4_ssc_is_inter(copy))
2742 putfh->no_verify = true;
2743 }
2744 }
2745}
2746#else
2747static void
2748check_if_stalefh_allowed(struct nfsd4_compoundargs *args)
2749{
2750}
2751#endif
2752
2753/*
2754 * COMPOUND call.
2755 */
2756static __be32
2757nfsd4_proc_compound(struct svc_rqst *rqstp)
2758{
2759 struct nfsd4_compoundargs *args = rqstp->rq_argp;
2760 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2761 struct nfsd4_op *op;
2762 struct nfsd4_compound_state *cstate = &resp->cstate;
2763 struct svc_fh *current_fh = &cstate->current_fh;
2764 struct svc_fh *save_fh = &cstate->save_fh;
2765 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2766 __be32 status;
2767
2768 resp->xdr = &rqstp->rq_res_stream;
2769 resp->statusp = resp->xdr->p;
2770
2771 /* reserve space for: NFS status code */
2772 xdr_reserve_space(resp->xdr, XDR_UNIT);
2773
2774 /* reserve space for: taglen, tag, and opcnt */
2775 xdr_reserve_space(resp->xdr, XDR_UNIT * 2 + args->taglen);
2776 resp->taglen = args->taglen;
2777 resp->tag = args->tag;
2778 resp->rqstp = rqstp;
2779 cstate->minorversion = args->minorversion;
2780 fh_init(current_fh, NFS4_FHSIZE);
2781 fh_init(save_fh, NFS4_FHSIZE);
2782 /*
2783 * Don't use the deferral mechanism for NFSv4; compounds make it
2784 * too hard to avoid non-idempotency problems.
2785 */
2786 clear_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
2787
2788 /*
2789 * According to RFC3010, this takes precedence over all other errors.
2790 */
2791 status = nfserr_minor_vers_mismatch;
2792 if (nfsd_minorversion(nn, args->minorversion, NFSD_TEST) <= 0)
2793 goto out;
2794
2795 status = nfs41_check_op_ordering(args);
2796 if (status) {
2797 op = &args->ops[0];
2798 op->status = status;
2799 resp->opcnt = 1;
2800 goto encode_op;
2801 }
2802 check_if_stalefh_allowed(args);
2803
2804 rqstp->rq_lease_breaker = (void **)&cstate->clp;
2805
2806 trace_nfsd_compound(rqstp, args->tag, args->taglen, args->client_opcnt);
2807 while (!status && resp->opcnt < args->opcnt) {
2808 op = &args->ops[resp->opcnt++];
2809
2810 if (unlikely(resp->opcnt == NFSD_MAX_OPS_PER_COMPOUND)) {
2811 /* If there are still more operations to process,
2812 * stop here and report NFS4ERR_RESOURCE. */
2813 if (cstate->minorversion == 0 &&
2814 args->client_opcnt > resp->opcnt) {
2815 op->status = nfserr_resource;
2816 goto encode_op;
2817 }
2818 }
2819
2820 /*
2821 * The XDR decode routines may have pre-set op->status;
2822 * for example, if there is a miscellaneous XDR error
2823 * it will be set to nfserr_bad_xdr.
2824 */
2825 if (op->status) {
2826 if (op->opnum == OP_OPEN)
2827 op->status = nfsd4_open_omfg(rqstp, cstate, op);
2828 goto encode_op;
2829 }
2830 if (!current_fh->fh_dentry &&
2831 !HAS_FH_FLAG(current_fh, NFSD4_FH_FOREIGN)) {
2832 if (!(op->opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
2833 op->status = nfserr_nofilehandle;
2834 goto encode_op;
2835 }
2836 } else if (current_fh->fh_export &&
2837 current_fh->fh_export->ex_fslocs.migrated &&
2838 !(op->opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
2839 op->status = nfserr_moved;
2840 goto encode_op;
2841 }
2842
2843 fh_clear_pre_post_attrs(current_fh);
2844
2845 /* If op is non-idempotent */
2846 if (op->opdesc->op_flags & OP_MODIFIES_SOMETHING) {
2847 /*
2848 * Don't execute this op if we couldn't encode a
2849 * successful reply:
2850 */
2851 u32 plen = op->opdesc->op_rsize_bop(rqstp, op);
2852 /*
2853 * Plus if there's another operation, make sure
2854 * we'll have space to at least encode an error:
2855 */
2856 if (resp->opcnt < args->opcnt)
2857 plen += COMPOUND_ERR_SLACK_SPACE;
2858 op->status = nfsd4_check_resp_size(resp, plen);
2859 }
2860
2861 if (op->status)
2862 goto encode_op;
2863
2864 if (op->opdesc->op_get_currentstateid)
2865 op->opdesc->op_get_currentstateid(cstate, &op->u);
2866 op->status = op->opdesc->op_func(rqstp, cstate, &op->u);
2867 trace_nfsd_compound_op_err(rqstp, op->opnum, op->status);
2868
2869 /* Only from SEQUENCE */
2870 if (cstate->status == nfserr_replay_cache) {
2871 dprintk("%s NFS4.1 replay from cache\n", __func__);
2872 status = op->status;
2873 goto out;
2874 }
2875 if (!op->status) {
2876 if (op->opdesc->op_set_currentstateid)
2877 op->opdesc->op_set_currentstateid(cstate, &op->u);
2878
2879 if (op->opdesc->op_flags & OP_CLEAR_STATEID)
2880 clear_current_stateid(cstate);
2881
2882 if (current_fh->fh_export &&
2883 need_wrongsec_check(rqstp))
2884 op->status = check_nfsd_access(current_fh->fh_export, rqstp, false);
2885 }
2886encode_op:
2887 if (op->status == nfserr_replay_me) {
2888 op->replay = &cstate->replay_owner->so_replay;
2889 nfsd4_encode_replay(resp->xdr, op);
2890 status = op->status = op->replay->rp_status;
2891 } else {
2892 nfsd4_encode_operation(resp, op);
2893 status = op->status;
2894 }
2895
2896 trace_nfsd_compound_status(args->client_opcnt, resp->opcnt,
2897 status, nfsd4_op_name(op->opnum));
2898
2899 nfsd4_cstate_clear_replay(cstate);
2900 nfsd4_increment_op_stats(nn, op->opnum);
2901 }
2902
2903 fh_put(current_fh);
2904 fh_put(save_fh);
2905 BUG_ON(cstate->replay_owner);
2906out:
2907 cstate->status = status;
2908 /* Reset deferral mechanism for RPC deferrals */
2909 set_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
2910 return rpc_success;
2911}
2912
2913#define op_encode_hdr_size (2)
2914#define op_encode_stateid_maxsz (XDR_QUADLEN(NFS4_STATEID_SIZE))
2915#define op_encode_verifier_maxsz (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
2916#define op_encode_change_info_maxsz (5)
2917#define nfs4_fattr_bitmap_maxsz (4)
2918
2919/* We'll fall back on returning no lockowner if run out of space: */
2920#define op_encode_lockowner_maxsz (0)
2921#define op_encode_lock_denied_maxsz (8 + op_encode_lockowner_maxsz)
2922
2923#define nfs4_owner_maxsz (1 + XDR_QUADLEN(IDMAP_NAMESZ))
2924
2925#define op_encode_ace_maxsz (3 + nfs4_owner_maxsz)
2926#define op_encode_delegation_maxsz (1 + op_encode_stateid_maxsz + 1 + \
2927 op_encode_ace_maxsz)
2928
2929#define op_encode_channel_attrs_maxsz (6 + 1 + 1)
2930
2931/*
2932 * The _rsize() helpers are invoked by the NFSv4 COMPOUND decoder, which
2933 * is called before sunrpc sets rq_res.buflen. Thus we have to compute
2934 * the maximum payload size here, based on transport limits and the size
2935 * of the remaining space in the rq_pages array.
2936 */
2937static u32 nfsd4_max_payload(const struct svc_rqst *rqstp)
2938{
2939 u32 buflen;
2940
2941 buflen = (rqstp->rq_page_end - rqstp->rq_next_page) * PAGE_SIZE;
2942 buflen -= rqstp->rq_auth_slack;
2943 buflen -= rqstp->rq_res.head[0].iov_len;
2944 return min_t(u32, buflen, svc_max_payload(rqstp));
2945}
2946
2947static u32 nfsd4_only_status_rsize(const struct svc_rqst *rqstp,
2948 const struct nfsd4_op *op)
2949{
2950 return (op_encode_hdr_size) * sizeof(__be32);
2951}
2952
2953static u32 nfsd4_status_stateid_rsize(const struct svc_rqst *rqstp,
2954 const struct nfsd4_op *op)
2955{
2956 return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
2957}
2958
2959static u32 nfsd4_access_rsize(const struct svc_rqst *rqstp,
2960 const struct nfsd4_op *op)
2961{
2962 /* ac_supported, ac_resp_access */
2963 return (op_encode_hdr_size + 2)* sizeof(__be32);
2964}
2965
2966static u32 nfsd4_commit_rsize(const struct svc_rqst *rqstp,
2967 const struct nfsd4_op *op)
2968{
2969 return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
2970}
2971
2972static u32 nfsd4_create_rsize(const struct svc_rqst *rqstp,
2973 const struct nfsd4_op *op)
2974{
2975 return (op_encode_hdr_size + op_encode_change_info_maxsz
2976 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
2977}
2978
2979/*
2980 * Note since this is an idempotent operation we won't insist on failing
2981 * the op prematurely if the estimate is too large. We may turn off splice
2982 * reads unnecessarily.
2983 */
2984static u32 nfsd4_getattr_rsize(const struct svc_rqst *rqstp,
2985 const struct nfsd4_op *op)
2986{
2987 const u32 *bmap = op->u.getattr.ga_bmval;
2988 u32 bmap0 = bmap[0], bmap1 = bmap[1], bmap2 = bmap[2];
2989 u32 ret = 0;
2990
2991 if (bmap0 & FATTR4_WORD0_ACL)
2992 return nfsd4_max_payload(rqstp);
2993 if (bmap0 & FATTR4_WORD0_FS_LOCATIONS)
2994 return nfsd4_max_payload(rqstp);
2995
2996 if (bmap1 & FATTR4_WORD1_OWNER) {
2997 ret += IDMAP_NAMESZ + 4;
2998 bmap1 &= ~FATTR4_WORD1_OWNER;
2999 }
3000 if (bmap1 & FATTR4_WORD1_OWNER_GROUP) {
3001 ret += IDMAP_NAMESZ + 4;
3002 bmap1 &= ~FATTR4_WORD1_OWNER_GROUP;
3003 }
3004 if (bmap0 & FATTR4_WORD0_FILEHANDLE) {
3005 ret += NFS4_FHSIZE + 4;
3006 bmap0 &= ~FATTR4_WORD0_FILEHANDLE;
3007 }
3008 if (bmap2 & FATTR4_WORD2_SECURITY_LABEL) {
3009 ret += NFS4_MAXLABELLEN + 12;
3010 bmap2 &= ~FATTR4_WORD2_SECURITY_LABEL;
3011 }
3012 /*
3013 * Largest of remaining attributes are 16 bytes (e.g.,
3014 * supported_attributes)
3015 */
3016 ret += 16 * (hweight32(bmap0) + hweight32(bmap1) + hweight32(bmap2));
3017 /* bitmask, length */
3018 ret += 20;
3019 return ret;
3020}
3021
3022static u32 nfsd4_getfh_rsize(const struct svc_rqst *rqstp,
3023 const struct nfsd4_op *op)
3024{
3025 return (op_encode_hdr_size + 1) * sizeof(__be32) + NFS4_FHSIZE;
3026}
3027
3028static u32 nfsd4_link_rsize(const struct svc_rqst *rqstp,
3029 const struct nfsd4_op *op)
3030{
3031 return (op_encode_hdr_size + op_encode_change_info_maxsz)
3032 * sizeof(__be32);
3033}
3034
3035static u32 nfsd4_lock_rsize(const struct svc_rqst *rqstp,
3036 const struct nfsd4_op *op)
3037{
3038 return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
3039 * sizeof(__be32);
3040}
3041
3042static u32 nfsd4_open_rsize(const struct svc_rqst *rqstp,
3043 const struct nfsd4_op *op)
3044{
3045 return (op_encode_hdr_size + op_encode_stateid_maxsz
3046 + op_encode_change_info_maxsz + 1
3047 + nfs4_fattr_bitmap_maxsz
3048 + op_encode_delegation_maxsz) * sizeof(__be32);
3049}
3050
3051static u32 nfsd4_read_rsize(const struct svc_rqst *rqstp,
3052 const struct nfsd4_op *op)
3053{
3054 u32 rlen = min(op->u.read.rd_length, nfsd4_max_payload(rqstp));
3055
3056 return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
3057}
3058
3059static u32 nfsd4_read_plus_rsize(const struct svc_rqst *rqstp,
3060 const struct nfsd4_op *op)
3061{
3062 u32 rlen = min(op->u.read.rd_length, nfsd4_max_payload(rqstp));
3063 /*
3064 * If we detect that the file changed during hole encoding, then we
3065 * recover by encoding the remaining reply as data. This means we need
3066 * to set aside enough room to encode two data segments.
3067 */
3068 u32 seg_len = 2 * (1 + 2 + 1);
3069
3070 return (op_encode_hdr_size + 2 + seg_len + XDR_QUADLEN(rlen)) * sizeof(__be32);
3071}
3072
3073static u32 nfsd4_readdir_rsize(const struct svc_rqst *rqstp,
3074 const struct nfsd4_op *op)
3075{
3076 u32 rlen = min(op->u.readdir.rd_maxcount, nfsd4_max_payload(rqstp));
3077
3078 return (op_encode_hdr_size + op_encode_verifier_maxsz +
3079 XDR_QUADLEN(rlen)) * sizeof(__be32);
3080}
3081
3082static u32 nfsd4_readlink_rsize(const struct svc_rqst *rqstp,
3083 const struct nfsd4_op *op)
3084{
3085 return (op_encode_hdr_size + 1) * sizeof(__be32) + PAGE_SIZE;
3086}
3087
3088static u32 nfsd4_remove_rsize(const struct svc_rqst *rqstp,
3089 const struct nfsd4_op *op)
3090{
3091 return (op_encode_hdr_size + op_encode_change_info_maxsz)
3092 * sizeof(__be32);
3093}
3094
3095static u32 nfsd4_rename_rsize(const struct svc_rqst *rqstp,
3096 const struct nfsd4_op *op)
3097{
3098 return (op_encode_hdr_size + op_encode_change_info_maxsz
3099 + op_encode_change_info_maxsz) * sizeof(__be32);
3100}
3101
3102static u32 nfsd4_sequence_rsize(const struct svc_rqst *rqstp,
3103 const struct nfsd4_op *op)
3104{
3105 return (op_encode_hdr_size
3106 + XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5) * sizeof(__be32);
3107}
3108
3109static u32 nfsd4_test_stateid_rsize(const struct svc_rqst *rqstp,
3110 const struct nfsd4_op *op)
3111{
3112 return (op_encode_hdr_size + 1 + op->u.test_stateid.ts_num_ids)
3113 * sizeof(__be32);
3114}
3115
3116static u32 nfsd4_setattr_rsize(const struct svc_rqst *rqstp,
3117 const struct nfsd4_op *op)
3118{
3119 return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
3120}
3121
3122static u32 nfsd4_secinfo_rsize(const struct svc_rqst *rqstp,
3123 const struct nfsd4_op *op)
3124{
3125 return (op_encode_hdr_size + RPC_AUTH_MAXFLAVOR *
3126 (4 + XDR_QUADLEN(GSS_OID_MAX_LEN))) * sizeof(__be32);
3127}
3128
3129static u32 nfsd4_setclientid_rsize(const struct svc_rqst *rqstp,
3130 const struct nfsd4_op *op)
3131{
3132 return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
3133 sizeof(__be32);
3134}
3135
3136static u32 nfsd4_write_rsize(const struct svc_rqst *rqstp,
3137 const struct nfsd4_op *op)
3138{
3139 return (op_encode_hdr_size + 2 + op_encode_verifier_maxsz) * sizeof(__be32);
3140}
3141
3142static u32 nfsd4_exchange_id_rsize(const struct svc_rqst *rqstp,
3143 const struct nfsd4_op *op)
3144{
3145 return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
3146 1 + 1 + /* eir_flags, spr_how */\
3147 4 + /* spo_must_enforce & _allow with bitmap */\
3148 2 + /*eir_server_owner.so_minor_id */\
3149 /* eir_server_owner.so_major_id<> */\
3150 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
3151 /* eir_server_scope<> */\
3152 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
3153 1 + /* eir_server_impl_id array length */\
3154 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
3155}
3156
3157static u32 nfsd4_bind_conn_to_session_rsize(const struct svc_rqst *rqstp,
3158 const struct nfsd4_op *op)
3159{
3160 return (op_encode_hdr_size + \
3161 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
3162 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
3163}
3164
3165static u32 nfsd4_create_session_rsize(const struct svc_rqst *rqstp,
3166 const struct nfsd4_op *op)
3167{
3168 return (op_encode_hdr_size + \
3169 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
3170 2 + /* csr_sequence, csr_flags */\
3171 op_encode_channel_attrs_maxsz + \
3172 op_encode_channel_attrs_maxsz) * sizeof(__be32);
3173}
3174
3175static u32 nfsd4_copy_rsize(const struct svc_rqst *rqstp,
3176 const struct nfsd4_op *op)
3177{
3178 return (op_encode_hdr_size +
3179 1 /* wr_callback */ +
3180 op_encode_stateid_maxsz /* wr_callback */ +
3181 2 /* wr_count */ +
3182 1 /* wr_committed */ +
3183 op_encode_verifier_maxsz +
3184 1 /* cr_consecutive */ +
3185 1 /* cr_synchronous */) * sizeof(__be32);
3186}
3187
3188static u32 nfsd4_offload_status_rsize(const struct svc_rqst *rqstp,
3189 const struct nfsd4_op *op)
3190{
3191 return (op_encode_hdr_size +
3192 2 /* osr_count */ +
3193 1 /* osr_complete<1> optional 0 for now */) * sizeof(__be32);
3194}
3195
3196static u32 nfsd4_copy_notify_rsize(const struct svc_rqst *rqstp,
3197 const struct nfsd4_op *op)
3198{
3199 return (op_encode_hdr_size +
3200 3 /* cnr_lease_time */ +
3201 1 /* We support one cnr_source_server */ +
3202 1 /* cnr_stateid seq */ +
3203 op_encode_stateid_maxsz /* cnr_stateid */ +
3204 1 /* num cnr_source_server*/ +
3205 1 /* nl4_type */ +
3206 1 /* nl4 size */ +
3207 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) /*nl4_loc + nl4_loc_sz */)
3208 * sizeof(__be32);
3209}
3210
3211static u32 nfsd4_get_dir_delegation_rsize(const struct svc_rqst *rqstp,
3212 const struct nfsd4_op *op)
3213{
3214 return (op_encode_hdr_size +
3215 1 /* gddr_status */ +
3216 op_encode_verifier_maxsz +
3217 op_encode_stateid_maxsz +
3218 2 /* gddr_notification */ +
3219 2 /* gddr_child_attributes */ +
3220 2 /* gddr_dir_attributes */);
3221}
3222
3223#ifdef CONFIG_NFSD_PNFS
3224static u32 nfsd4_getdeviceinfo_rsize(const struct svc_rqst *rqstp,
3225 const struct nfsd4_op *op)
3226{
3227 u32 rlen = min(op->u.getdeviceinfo.gd_maxcount, nfsd4_max_payload(rqstp));
3228
3229 return (op_encode_hdr_size +
3230 1 /* gd_layout_type*/ +
3231 XDR_QUADLEN(rlen) +
3232 2 /* gd_notify_types */) * sizeof(__be32);
3233}
3234
3235/*
3236 * At this stage we don't really know what layout driver will handle the request,
3237 * so we need to define an arbitrary upper bound here.
3238 */
3239#define MAX_LAYOUT_SIZE 128
3240static u32 nfsd4_layoutget_rsize(const struct svc_rqst *rqstp,
3241 const struct nfsd4_op *op)
3242{
3243 return (op_encode_hdr_size +
3244 1 /* logr_return_on_close */ +
3245 op_encode_stateid_maxsz +
3246 1 /* nr of layouts */ +
3247 MAX_LAYOUT_SIZE) * sizeof(__be32);
3248}
3249
3250static u32 nfsd4_layoutcommit_rsize(const struct svc_rqst *rqstp,
3251 const struct nfsd4_op *op)
3252{
3253 return (op_encode_hdr_size +
3254 1 /* locr_newsize */ +
3255 2 /* ns_size */) * sizeof(__be32);
3256}
3257
3258static u32 nfsd4_layoutreturn_rsize(const struct svc_rqst *rqstp,
3259 const struct nfsd4_op *op)
3260{
3261 return (op_encode_hdr_size +
3262 1 /* lrs_stateid */ +
3263 op_encode_stateid_maxsz) * sizeof(__be32);
3264}
3265#endif /* CONFIG_NFSD_PNFS */
3266
3267
3268static u32 nfsd4_seek_rsize(const struct svc_rqst *rqstp,
3269 const struct nfsd4_op *op)
3270{
3271 return (op_encode_hdr_size + 3) * sizeof(__be32);
3272}
3273
3274static u32 nfsd4_getxattr_rsize(const struct svc_rqst *rqstp,
3275 const struct nfsd4_op *op)
3276{
3277 u32 rlen = min_t(u32, XATTR_SIZE_MAX, nfsd4_max_payload(rqstp));
3278
3279 return (op_encode_hdr_size + 1 + XDR_QUADLEN(rlen)) * sizeof(__be32);
3280}
3281
3282static u32 nfsd4_setxattr_rsize(const struct svc_rqst *rqstp,
3283 const struct nfsd4_op *op)
3284{
3285 return (op_encode_hdr_size + op_encode_change_info_maxsz)
3286 * sizeof(__be32);
3287}
3288static u32 nfsd4_listxattrs_rsize(const struct svc_rqst *rqstp,
3289 const struct nfsd4_op *op)
3290{
3291 u32 rlen = min(op->u.listxattrs.lsxa_maxcount, nfsd4_max_payload(rqstp));
3292
3293 return (op_encode_hdr_size + 4 + XDR_QUADLEN(rlen)) * sizeof(__be32);
3294}
3295
3296static u32 nfsd4_removexattr_rsize(const struct svc_rqst *rqstp,
3297 const struct nfsd4_op *op)
3298{
3299 return (op_encode_hdr_size + op_encode_change_info_maxsz)
3300 * sizeof(__be32);
3301}
3302
3303
3304static const struct nfsd4_operation nfsd4_ops[] = {
3305 [OP_ACCESS] = {
3306 .op_func = nfsd4_access,
3307 .op_name = "OP_ACCESS",
3308 .op_rsize_bop = nfsd4_access_rsize,
3309 },
3310 [OP_CLOSE] = {
3311 .op_func = nfsd4_close,
3312 .op_flags = OP_MODIFIES_SOMETHING,
3313 .op_name = "OP_CLOSE",
3314 .op_rsize_bop = nfsd4_status_stateid_rsize,
3315 .op_get_currentstateid = nfsd4_get_closestateid,
3316 .op_set_currentstateid = nfsd4_set_closestateid,
3317 },
3318 [OP_COMMIT] = {
3319 .op_func = nfsd4_commit,
3320 .op_flags = OP_MODIFIES_SOMETHING,
3321 .op_name = "OP_COMMIT",
3322 .op_rsize_bop = nfsd4_commit_rsize,
3323 },
3324 [OP_CREATE] = {
3325 .op_func = nfsd4_create,
3326 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
3327 .op_name = "OP_CREATE",
3328 .op_rsize_bop = nfsd4_create_rsize,
3329 },
3330 [OP_DELEGRETURN] = {
3331 .op_func = nfsd4_delegreturn,
3332 .op_flags = OP_MODIFIES_SOMETHING,
3333 .op_name = "OP_DELEGRETURN",
3334 .op_rsize_bop = nfsd4_only_status_rsize,
3335 .op_get_currentstateid = nfsd4_get_delegreturnstateid,
3336 },
3337 [OP_GETATTR] = {
3338 .op_func = nfsd4_getattr,
3339 .op_flags = ALLOWED_ON_ABSENT_FS,
3340 .op_rsize_bop = nfsd4_getattr_rsize,
3341 .op_name = "OP_GETATTR",
3342 },
3343 [OP_GETFH] = {
3344 .op_func = nfsd4_getfh,
3345 .op_name = "OP_GETFH",
3346 .op_rsize_bop = nfsd4_getfh_rsize,
3347 },
3348 [OP_LINK] = {
3349 .op_func = nfsd4_link,
3350 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
3351 | OP_CACHEME,
3352 .op_name = "OP_LINK",
3353 .op_rsize_bop = nfsd4_link_rsize,
3354 },
3355 [OP_LOCK] = {
3356 .op_func = nfsd4_lock,
3357 .op_release = nfsd4_lock_release,
3358 .op_flags = OP_MODIFIES_SOMETHING |
3359 OP_NONTRIVIAL_ERROR_ENCODE,
3360 .op_name = "OP_LOCK",
3361 .op_rsize_bop = nfsd4_lock_rsize,
3362 .op_set_currentstateid = nfsd4_set_lockstateid,
3363 },
3364 [OP_LOCKT] = {
3365 .op_func = nfsd4_lockt,
3366 .op_release = nfsd4_lockt_release,
3367 .op_flags = OP_NONTRIVIAL_ERROR_ENCODE,
3368 .op_name = "OP_LOCKT",
3369 .op_rsize_bop = nfsd4_lock_rsize,
3370 },
3371 [OP_LOCKU] = {
3372 .op_func = nfsd4_locku,
3373 .op_flags = OP_MODIFIES_SOMETHING,
3374 .op_name = "OP_LOCKU",
3375 .op_rsize_bop = nfsd4_status_stateid_rsize,
3376 .op_get_currentstateid = nfsd4_get_lockustateid,
3377 },
3378 [OP_LOOKUP] = {
3379 .op_func = nfsd4_lookup,
3380 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
3381 .op_name = "OP_LOOKUP",
3382 .op_rsize_bop = nfsd4_only_status_rsize,
3383 },
3384 [OP_LOOKUPP] = {
3385 .op_func = nfsd4_lookupp,
3386 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
3387 .op_name = "OP_LOOKUPP",
3388 .op_rsize_bop = nfsd4_only_status_rsize,
3389 },
3390 [OP_NVERIFY] = {
3391 .op_func = nfsd4_nverify,
3392 .op_name = "OP_NVERIFY",
3393 .op_rsize_bop = nfsd4_only_status_rsize,
3394 },
3395 [OP_OPEN] = {
3396 .op_func = nfsd4_open,
3397 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
3398 .op_name = "OP_OPEN",
3399 .op_rsize_bop = nfsd4_open_rsize,
3400 .op_set_currentstateid = nfsd4_set_openstateid,
3401 },
3402 [OP_OPEN_CONFIRM] = {
3403 .op_func = nfsd4_open_confirm,
3404 .op_flags = OP_MODIFIES_SOMETHING,
3405 .op_name = "OP_OPEN_CONFIRM",
3406 .op_rsize_bop = nfsd4_status_stateid_rsize,
3407 },
3408 [OP_OPEN_DOWNGRADE] = {
3409 .op_func = nfsd4_open_downgrade,
3410 .op_flags = OP_MODIFIES_SOMETHING,
3411 .op_name = "OP_OPEN_DOWNGRADE",
3412 .op_rsize_bop = nfsd4_status_stateid_rsize,
3413 .op_get_currentstateid = nfsd4_get_opendowngradestateid,
3414 .op_set_currentstateid = nfsd4_set_opendowngradestateid,
3415 },
3416 [OP_PUTFH] = {
3417 .op_func = nfsd4_putfh,
3418 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3419 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
3420 .op_name = "OP_PUTFH",
3421 .op_rsize_bop = nfsd4_only_status_rsize,
3422 },
3423 [OP_PUTPUBFH] = {
3424 .op_func = nfsd4_putrootfh,
3425 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3426 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
3427 .op_name = "OP_PUTPUBFH",
3428 .op_rsize_bop = nfsd4_only_status_rsize,
3429 },
3430 [OP_PUTROOTFH] = {
3431 .op_func = nfsd4_putrootfh,
3432 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3433 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
3434 .op_name = "OP_PUTROOTFH",
3435 .op_rsize_bop = nfsd4_only_status_rsize,
3436 },
3437 [OP_READ] = {
3438 .op_func = nfsd4_read,
3439 .op_release = nfsd4_read_release,
3440 .op_name = "OP_READ",
3441 .op_rsize_bop = nfsd4_read_rsize,
3442 .op_get_currentstateid = nfsd4_get_readstateid,
3443 },
3444 [OP_READDIR] = {
3445 .op_func = nfsd4_readdir,
3446 .op_name = "OP_READDIR",
3447 .op_rsize_bop = nfsd4_readdir_rsize,
3448 },
3449 [OP_READLINK] = {
3450 .op_func = nfsd4_readlink,
3451 .op_name = "OP_READLINK",
3452 .op_rsize_bop = nfsd4_readlink_rsize,
3453 },
3454 [OP_REMOVE] = {
3455 .op_func = nfsd4_remove,
3456 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
3457 .op_name = "OP_REMOVE",
3458 .op_rsize_bop = nfsd4_remove_rsize,
3459 },
3460 [OP_RENAME] = {
3461 .op_func = nfsd4_rename,
3462 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
3463 .op_name = "OP_RENAME",
3464 .op_rsize_bop = nfsd4_rename_rsize,
3465 },
3466 [OP_RENEW] = {
3467 .op_func = nfsd4_renew,
3468 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3469 | OP_MODIFIES_SOMETHING,
3470 .op_name = "OP_RENEW",
3471 .op_rsize_bop = nfsd4_only_status_rsize,
3472
3473 },
3474 [OP_RESTOREFH] = {
3475 .op_func = nfsd4_restorefh,
3476 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3477 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
3478 .op_name = "OP_RESTOREFH",
3479 .op_rsize_bop = nfsd4_only_status_rsize,
3480 },
3481 [OP_SAVEFH] = {
3482 .op_func = nfsd4_savefh,
3483 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
3484 .op_name = "OP_SAVEFH",
3485 .op_rsize_bop = nfsd4_only_status_rsize,
3486 },
3487 [OP_SECINFO] = {
3488 .op_func = nfsd4_secinfo,
3489 .op_release = nfsd4_secinfo_release,
3490 .op_flags = OP_HANDLES_WRONGSEC,
3491 .op_name = "OP_SECINFO",
3492 .op_rsize_bop = nfsd4_secinfo_rsize,
3493 },
3494 [OP_SETATTR] = {
3495 .op_func = nfsd4_setattr,
3496 .op_name = "OP_SETATTR",
3497 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME
3498 | OP_NONTRIVIAL_ERROR_ENCODE,
3499 .op_rsize_bop = nfsd4_setattr_rsize,
3500 .op_get_currentstateid = nfsd4_get_setattrstateid,
3501 },
3502 [OP_SETCLIENTID] = {
3503 .op_func = nfsd4_setclientid,
3504 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3505 | OP_MODIFIES_SOMETHING | OP_CACHEME
3506 | OP_NONTRIVIAL_ERROR_ENCODE,
3507 .op_name = "OP_SETCLIENTID",
3508 .op_rsize_bop = nfsd4_setclientid_rsize,
3509 },
3510 [OP_SETCLIENTID_CONFIRM] = {
3511 .op_func = nfsd4_setclientid_confirm,
3512 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3513 | OP_MODIFIES_SOMETHING | OP_CACHEME,
3514 .op_name = "OP_SETCLIENTID_CONFIRM",
3515 .op_rsize_bop = nfsd4_only_status_rsize,
3516 },
3517 [OP_VERIFY] = {
3518 .op_func = nfsd4_verify,
3519 .op_name = "OP_VERIFY",
3520 .op_rsize_bop = nfsd4_only_status_rsize,
3521 },
3522 [OP_WRITE] = {
3523 .op_func = nfsd4_write,
3524 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
3525 .op_name = "OP_WRITE",
3526 .op_rsize_bop = nfsd4_write_rsize,
3527 .op_get_currentstateid = nfsd4_get_writestateid,
3528 },
3529 [OP_RELEASE_LOCKOWNER] = {
3530 .op_func = nfsd4_release_lockowner,
3531 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3532 | OP_MODIFIES_SOMETHING,
3533 .op_name = "OP_RELEASE_LOCKOWNER",
3534 .op_rsize_bop = nfsd4_only_status_rsize,
3535 },
3536
3537 /* NFSv4.1 operations */
3538 [OP_EXCHANGE_ID] = {
3539 .op_func = nfsd4_exchange_id,
3540 .op_release = nfsd4_exchange_id_release,
3541 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
3542 | OP_MODIFIES_SOMETHING,
3543 .op_name = "OP_EXCHANGE_ID",
3544 .op_rsize_bop = nfsd4_exchange_id_rsize,
3545 },
3546 [OP_BACKCHANNEL_CTL] = {
3547 .op_func = nfsd4_backchannel_ctl,
3548 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
3549 .op_name = "OP_BACKCHANNEL_CTL",
3550 .op_rsize_bop = nfsd4_only_status_rsize,
3551 },
3552 [OP_BIND_CONN_TO_SESSION] = {
3553 .op_func = nfsd4_bind_conn_to_session,
3554 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
3555 | OP_MODIFIES_SOMETHING,
3556 .op_name = "OP_BIND_CONN_TO_SESSION",
3557 .op_rsize_bop = nfsd4_bind_conn_to_session_rsize,
3558 },
3559 [OP_CREATE_SESSION] = {
3560 .op_func = nfsd4_create_session,
3561 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
3562 | OP_MODIFIES_SOMETHING,
3563 .op_name = "OP_CREATE_SESSION",
3564 .op_rsize_bop = nfsd4_create_session_rsize,
3565 },
3566 [OP_DESTROY_SESSION] = {
3567 .op_func = nfsd4_destroy_session,
3568 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
3569 | OP_MODIFIES_SOMETHING,
3570 .op_name = "OP_DESTROY_SESSION",
3571 .op_rsize_bop = nfsd4_only_status_rsize,
3572 },
3573 [OP_SEQUENCE] = {
3574 .op_func = nfsd4_sequence,
3575 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
3576 .op_name = "OP_SEQUENCE",
3577 .op_rsize_bop = nfsd4_sequence_rsize,
3578 },
3579 [OP_DESTROY_CLIENTID] = {
3580 .op_func = nfsd4_destroy_clientid,
3581 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
3582 | OP_MODIFIES_SOMETHING,
3583 .op_name = "OP_DESTROY_CLIENTID",
3584 .op_rsize_bop = nfsd4_only_status_rsize,
3585 },
3586 [OP_RECLAIM_COMPLETE] = {
3587 .op_func = nfsd4_reclaim_complete,
3588 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
3589 .op_name = "OP_RECLAIM_COMPLETE",
3590 .op_rsize_bop = nfsd4_only_status_rsize,
3591 },
3592 [OP_SECINFO_NO_NAME] = {
3593 .op_func = nfsd4_secinfo_no_name,
3594 .op_release = nfsd4_secinfo_no_name_release,
3595 .op_flags = OP_HANDLES_WRONGSEC,
3596 .op_name = "OP_SECINFO_NO_NAME",
3597 .op_rsize_bop = nfsd4_secinfo_rsize,
3598 },
3599 [OP_TEST_STATEID] = {
3600 .op_func = nfsd4_test_stateid,
3601 .op_flags = ALLOWED_WITHOUT_FH,
3602 .op_name = "OP_TEST_STATEID",
3603 .op_rsize_bop = nfsd4_test_stateid_rsize,
3604 },
3605 [OP_FREE_STATEID] = {
3606 .op_func = nfsd4_free_stateid,
3607 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
3608 .op_name = "OP_FREE_STATEID",
3609 .op_get_currentstateid = nfsd4_get_freestateid,
3610 .op_rsize_bop = nfsd4_only_status_rsize,
3611 },
3612 [OP_GET_DIR_DELEGATION] = {
3613 .op_func = nfsd4_get_dir_delegation,
3614 .op_flags = OP_MODIFIES_SOMETHING,
3615 .op_name = "OP_GET_DIR_DELEGATION",
3616 .op_rsize_bop = nfsd4_get_dir_delegation_rsize,
3617 },
3618#ifdef CONFIG_NFSD_PNFS
3619 [OP_GETDEVICEINFO] = {
3620 .op_func = nfsd4_getdeviceinfo,
3621 .op_release = nfsd4_getdeviceinfo_release,
3622 .op_flags = ALLOWED_WITHOUT_FH,
3623 .op_name = "OP_GETDEVICEINFO",
3624 .op_rsize_bop = nfsd4_getdeviceinfo_rsize,
3625 },
3626 [OP_LAYOUTGET] = {
3627 .op_func = nfsd4_layoutget,
3628 .op_release = nfsd4_layoutget_release,
3629 .op_flags = OP_MODIFIES_SOMETHING,
3630 .op_name = "OP_LAYOUTGET",
3631 .op_rsize_bop = nfsd4_layoutget_rsize,
3632 },
3633 [OP_LAYOUTCOMMIT] = {
3634 .op_func = nfsd4_layoutcommit,
3635 .op_flags = OP_MODIFIES_SOMETHING,
3636 .op_name = "OP_LAYOUTCOMMIT",
3637 .op_rsize_bop = nfsd4_layoutcommit_rsize,
3638 },
3639 [OP_LAYOUTRETURN] = {
3640 .op_func = nfsd4_layoutreturn,
3641 .op_flags = OP_MODIFIES_SOMETHING,
3642 .op_name = "OP_LAYOUTRETURN",
3643 .op_rsize_bop = nfsd4_layoutreturn_rsize,
3644 },
3645#endif /* CONFIG_NFSD_PNFS */
3646
3647 /* NFSv4.2 operations */
3648 [OP_ALLOCATE] = {
3649 .op_func = nfsd4_allocate,
3650 .op_flags = OP_MODIFIES_SOMETHING,
3651 .op_name = "OP_ALLOCATE",
3652 .op_rsize_bop = nfsd4_only_status_rsize,
3653 },
3654 [OP_DEALLOCATE] = {
3655 .op_func = nfsd4_deallocate,
3656 .op_flags = OP_MODIFIES_SOMETHING,
3657 .op_name = "OP_DEALLOCATE",
3658 .op_rsize_bop = nfsd4_only_status_rsize,
3659 },
3660 [OP_CLONE] = {
3661 .op_func = nfsd4_clone,
3662 .op_flags = OP_MODIFIES_SOMETHING,
3663 .op_name = "OP_CLONE",
3664 .op_rsize_bop = nfsd4_only_status_rsize,
3665 },
3666 [OP_COPY] = {
3667 .op_func = nfsd4_copy,
3668 .op_flags = OP_MODIFIES_SOMETHING,
3669 .op_name = "OP_COPY",
3670 .op_rsize_bop = nfsd4_copy_rsize,
3671 },
3672 [OP_READ_PLUS] = {
3673 .op_func = nfsd4_read,
3674 .op_release = nfsd4_read_release,
3675 .op_name = "OP_READ_PLUS",
3676 .op_rsize_bop = nfsd4_read_plus_rsize,
3677 .op_get_currentstateid = nfsd4_get_readstateid,
3678 },
3679 [OP_SEEK] = {
3680 .op_func = nfsd4_seek,
3681 .op_name = "OP_SEEK",
3682 .op_rsize_bop = nfsd4_seek_rsize,
3683 },
3684 [OP_OFFLOAD_STATUS] = {
3685 .op_func = nfsd4_offload_status,
3686 .op_name = "OP_OFFLOAD_STATUS",
3687 .op_rsize_bop = nfsd4_offload_status_rsize,
3688 },
3689 [OP_OFFLOAD_CANCEL] = {
3690 .op_func = nfsd4_offload_cancel,
3691 .op_flags = OP_MODIFIES_SOMETHING,
3692 .op_name = "OP_OFFLOAD_CANCEL",
3693 .op_rsize_bop = nfsd4_only_status_rsize,
3694 },
3695 [OP_COPY_NOTIFY] = {
3696 .op_func = nfsd4_copy_notify,
3697 .op_flags = OP_MODIFIES_SOMETHING,
3698 .op_name = "OP_COPY_NOTIFY",
3699 .op_rsize_bop = nfsd4_copy_notify_rsize,
3700 },
3701 [OP_GETXATTR] = {
3702 .op_func = nfsd4_getxattr,
3703 .op_name = "OP_GETXATTR",
3704 .op_rsize_bop = nfsd4_getxattr_rsize,
3705 },
3706 [OP_SETXATTR] = {
3707 .op_func = nfsd4_setxattr,
3708 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
3709 .op_name = "OP_SETXATTR",
3710 .op_rsize_bop = nfsd4_setxattr_rsize,
3711 },
3712 [OP_LISTXATTRS] = {
3713 .op_func = nfsd4_listxattrs,
3714 .op_name = "OP_LISTXATTRS",
3715 .op_rsize_bop = nfsd4_listxattrs_rsize,
3716 },
3717 [OP_REMOVEXATTR] = {
3718 .op_func = nfsd4_removexattr,
3719 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
3720 .op_name = "OP_REMOVEXATTR",
3721 .op_rsize_bop = nfsd4_removexattr_rsize,
3722 },
3723};
3724
3725/**
3726 * nfsd4_spo_must_allow - Determine if the compound op contains an
3727 * operation that is allowed to be sent with machine credentials
3728 *
3729 * @rqstp: a pointer to the struct svc_rqst
3730 *
3731 * Checks to see if the compound contains a spo_must_allow op
3732 * and confirms that it was sent with the proper machine creds.
3733 */
3734
3735bool nfsd4_spo_must_allow(struct svc_rqst *rqstp)
3736{
3737 struct nfsd4_compoundres *resp = rqstp->rq_resp;
3738 struct nfsd4_compoundargs *argp = rqstp->rq_argp;
3739 struct nfsd4_op *this;
3740 struct nfsd4_compound_state *cstate = &resp->cstate;
3741 struct nfs4_op_map *allow = &cstate->clp->cl_spo_must_allow;
3742 u32 opiter;
3743
3744 if (!cstate->minorversion)
3745 return false;
3746
3747 if (cstate->spo_must_allowed)
3748 return true;
3749
3750 opiter = resp->opcnt;
3751 while (opiter < argp->opcnt) {
3752 this = &argp->ops[opiter++];
3753 if (test_bit(this->opnum, allow->u.longs) &&
3754 cstate->clp->cl_mach_cred &&
3755 nfsd4_mach_creds_match(cstate->clp, rqstp)) {
3756 cstate->spo_must_allowed = true;
3757 return true;
3758 }
3759 }
3760 cstate->spo_must_allowed = false;
3761 return false;
3762}
3763
3764int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
3765{
3766 if (op->opnum == OP_ILLEGAL || op->status == nfserr_notsupp)
3767 return op_encode_hdr_size * sizeof(__be32);
3768
3769 BUG_ON(OPDESC(op)->op_rsize_bop == NULL);
3770 return OPDESC(op)->op_rsize_bop(rqstp, op);
3771}
3772
3773void warn_on_nonidempotent_op(struct nfsd4_op *op)
3774{
3775 if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
3776 pr_err("unable to encode reply to nonidempotent op %u (%s)\n",
3777 op->opnum, nfsd4_op_name(op->opnum));
3778 WARN_ON_ONCE(1);
3779 }
3780}
3781
3782static const char *nfsd4_op_name(unsigned opnum)
3783{
3784 if (opnum < ARRAY_SIZE(nfsd4_ops))
3785 return nfsd4_ops[opnum].op_name;
3786 return "unknown_operation";
3787}
3788
3789static const struct svc_procedure nfsd_procedures4[2] = {
3790 [NFSPROC4_NULL] = {
3791 .pc_func = nfsd4_proc_null,
3792 .pc_decode = nfssvc_decode_voidarg,
3793 .pc_encode = nfssvc_encode_voidres,
3794 .pc_argsize = sizeof(struct nfsd_voidargs),
3795 .pc_argzero = sizeof(struct nfsd_voidargs),
3796 .pc_ressize = sizeof(struct nfsd_voidres),
3797 .pc_cachetype = RC_NOCACHE,
3798 .pc_xdrressize = 1,
3799 .pc_name = "NULL",
3800 },
3801 [NFSPROC4_COMPOUND] = {
3802 .pc_func = nfsd4_proc_compound,
3803 .pc_decode = nfs4svc_decode_compoundargs,
3804 .pc_encode = nfs4svc_encode_compoundres,
3805 .pc_argsize = sizeof(struct nfsd4_compoundargs),
3806 .pc_argzero = offsetof(struct nfsd4_compoundargs, iops),
3807 .pc_ressize = sizeof(struct nfsd4_compoundres),
3808 .pc_release = nfsd4_release_compoundargs,
3809 .pc_cachetype = RC_NOCACHE,
3810 .pc_xdrressize = NFSD_BUFSIZE/4,
3811 .pc_name = "COMPOUND",
3812 },
3813};
3814
3815static DEFINE_PER_CPU_ALIGNED(unsigned long,
3816 nfsd_count4[ARRAY_SIZE(nfsd_procedures4)]);
3817const struct svc_version nfsd_version4 = {
3818 .vs_vers = 4,
3819 .vs_nproc = ARRAY_SIZE(nfsd_procedures4),
3820 .vs_proc = nfsd_procedures4,
3821 .vs_count = nfsd_count4,
3822 .vs_dispatch = nfsd_dispatch,
3823 .vs_xdrsize = NFS4_SVC_XDRSIZE,
3824 .vs_rpcb_optnl = true,
3825 .vs_need_cong_ctrl = true,
3826};